Gates That Open User Manual

Installation Manual  
402  
DUAL GATE OPENER  
WARNING!  
This equipment is similar to other gate or door equipment and meets or exceeds Underwriters  
Laboratory Standard 325 (UL 325). However, gate equipment has hazards associated with its  
use and therefore by installing this product the installer and user accept full responsibility for  
following and noting the installation and safety instructions. Failure to follow installation and safety  
instructions can result in hazards developing due to improper assembly. You agree to properly  
install this product and that if you fail to do so Gates That Open, LLC, shall in no event be liable for  
direct, indirect, incidental, special or consequential damages or loss of profits whether based in  
contract tort or any other legal theory during the course of the warranty or at any time thereafter.  
The installer and/or user agree to assume responsibility for all liability and use of this product  
releasing Gates That Open, LLC, from any and all liability. If you are not in agreement with this  
disclaimer or do not feel capable of properly following all installation and safety instructions you  
may return this product for full replacement value.  
READ ALL INSTRUCTIONS CAREFULLY AND COMPLETELY before attempting to install and  
use this automatic gate opener. This gate opener produces a high level of force. Stay clear of the  
unit while it is operating and exercise caution at all times.  
All automatic gate openers are intended for use on vehicular gates only.  
This product meets and exceeds the requirements of UL 325, the standard which regulates gate  
opener safety, as established and made effective March 1, 2000, by Underwriters Laboratories Inc.  
GTO Sales: 850-575-0176 • Fax 850-575-8912  
GTO Technical Service 850-575-4144  
For 24 hour/day, 7 day/week Technical Service visit http://support.gtoinc.com  
For more information on Mighty Mule’s full line of Automatic Gate Openers and Access Controls visit www.mightymule.com  
rev-082211  
Printed in China for Gates That Open, LLC.  
Table Of Contents  
Please Read This First ...................................................................................................ii  
Important Safety Instructions ..................................................................................iii–viii  
How to Manually Open and Close the Gate:..............................................................iii  
For the Consumer.......................................................................................................iv  
Required Safety Precautions for Gates ......................................................................vi  
Secondary Means of Protection Against Entrapment ...............................................vii  
Entrapment Alarm (UL 325; 30A.1.1A) ......................................................................vii  
Technical Specifications................................................................................................ 1  
Before You Begin........................................................................................................... 2  
Solar Panel and Gate Activity Chart............................................................................ 2  
Parts List – Opener and Mounting Hardware............................................................. 4  
Tools and Materials..................................................................................................... 5  
Installation Overview for Pull-To-Open Gates ............................................................. 6  
Installation of the First Gate Opener ............................................................................. 7  
Install Post Bracket Assembly and Gate Bracket....................................................... 8  
Attach Opener Arm................................................................................................... 10  
Install the Closed Position Stop Plates..................................................................... 11  
Mount the Battery Box and Control Box................................................................... 12  
Connecting the Battery............................................................................................. 13  
Remove the Control Box Cover ............................................................................... 13  
Connect Opener Power Cables................................................................................ 14  
Connect the Transformer ......................................................................................... 14  
Set the Closed Position Limit.................................................................................... 16  
Adjust the Stall Force Setting ................................................................................ 17  
Set Auto-Close Time................................................................................................. 17  
Personalize Your Transmitter Setting ........................................................................ 18  
Push-To-Open Installation Instructions ....................................................................... 19  
Solar Panel Instructions............................................................................................... 21  
Connecting Accessories and Safety Devices............................................................. 22  
Troubleshooting Guide................................................................................................ 24  
Gate and Opener Maintenance .................................................................................. 25  
Warranty Repair........................................................................................................... 25  
Accessories................................................................................................................. 26  
rev 082211  
Mighty Mule FM402 Installation Instructions i  
PLEASE READ THIS FIRST  
Thank you for purchasing a Mighty Mule FM402 Gate Opener—GTO’s “do-it-yourself” automatic gate opener!  
When correctly installed and properly used, your Mighty Mule Gate Opener will give you many years of reliable  
service. Please read the following information and watch the enclosed video to ensure you have the correct  
system for your particular needs. Furthermore, this manual and the video will enable you to properly install  
your Mighty Mule Gate Opener.  
The Mighty Mule Gate Opener is designed for installation on Pull-To-Open dual gate leaves (gates that  
open into the property). By purchasing accessory brackets [FM148], the Mighty Mule Gate Opener can  
accommodate Push-To-Open dual gate leaves (gates that open out from the property). Please see Pull-To-  
Open/Push-To-Open diagram on page 3. The gates must not exceed 12 ft. or 300 lbs. per leaf (see Technical  
Specifications on page 1). The Mighty Mule Gate Opener can be used on vinyl, aluminum, chain link, farm  
tube, and wrought iron gates.  
Use on solid (surface) gates is not recommended. Solid surface gates have a high resistance  
to the wind. If the wind is strong enough, the opener will obstruct and stop, blow fuses, or  
may damage the equipment.  
The Mighty Mule Gate Opener features an adjustable stall force setting. This safety feature makes the gate  
stop and reverse direction within 2 seconds when it comes in contact with an obstruction. The MIN setting  
means the gate will exert the minimum force on an obstruction before it stops and reverses direction. You will  
need to adjust the stall force for your particular application.  
The Mighty Mule Gate Opener also has an adjustable auto-close feature. After the gate reaches the fully  
open position, it can be set for OFF, or to remain open up from 3 to 120 seconds before automatically closing.  
Pressing the transmitter button at any time after the gate opens fully will cause it to close immediately. The  
auto-close factory setting is OFF, meaning the gate will stay open until you press the transmitter (or keypad,  
etc.) again.  
The Mighty Mule Gate Opener accommodates extra transmitters, digital keypads, solar panels, push buttons,  
automatic gate locks, and other access control products. These optional accessories (page 26) are available  
Special Order (if the accessory is not in stock). If your store cannot special order accessories, please call the  
GTO Sales Department (850/575-0176) or visit www.mightymule.com.  
PLEASE NOTE—If your application requires any of the following:  
Column Mounting  
Slide gates  
Swing gates longer than 12 feet or weighing more than 300 pounds  
Professional installation  
please call GTO at 800-543-4283 or 850-575-0176 for information about our GTO/ACCESS SYSTEMS  
professional line of gate openers and accessories. Our Sales Department will be glad to give you the  
name and phone number of a GTO/ACCESS SYSTEMS dealer near you.  
BEFORE YOU BEGIN TO INSTALL YOUR AUTOMATIC GATE OPENER:  
Read these instructions carefully and completely to become familiar with all parts and installation steps.  
The video is only designed as an overview of the installation procedure. You must read the installation  
manual for detailed instructions on gate opener safety and proper use of the gate opener.  
ii Mighty Mule FM402 Installation Instructions  
rev 082211  
IMPORTANT SAFETY INSTRUCTIONS  
Because automatic gate openers produce high levels of force, consumers need to know the potential  
hazards associated with improperly designed, installed, and maintained automated gate opener  
systems. Keep in mind that the gate opener is just one component of the total gate operating system.  
Each component must work in unison to provide the consumer with convenience, security, and  
safety.  
This manual contains various safety precautions and warnings for the consumer. Because there are  
many possible applications of the gate opener, the safety precautions and warnings contained in this  
manual cannot be completely exhaustive in nature. They do, however, provide an overview of the  
safe design, installation, and use of this product. CAREFULLY READ AND FOLLOW ALL SAFETY  
PRECAUTIONS, WARNINGS, AND INSTALLATION INSTRUCTIONS TO ENSURE THE SAFE  
SYSTEM DESIGN, INSTALLATION, AND USE OF THIS PRODUCT.  
Precautions and warnings in this manual are identified with this  
warning symbol. The symbol  
identifies conditions that can result in damage to the opener or its components, serious injury, or  
death.  
Because GTO automatic gate openers are only part of the total gate operating system, it is the  
responsibility of the consumer to ensure that the total system is safe for its intended use.  
How To Manually Open and Close the Gate:  
CAUTION: The gate can be opened and closed manually when the opener is disconnected.  
ONLY disconnect the opener when the opener power switch is OFF and the gate is NOT moving.  
Disconnecting the Opener  
Front Mount  
1. Turn opener power switch (Control Box) OFF.  
2. Remove hairpin clip, clevis pin, and bushing from both  
the front and rear mounting points.  
Clevis  
Pin  
3. Remove the opener from the mount.  
IMPORTANT: NEVER allow opener arm to hang  
by the front or rear mount — it will break from  
the arm weight.  
Bushing  
Gate Bracket  
Hairpin Clip  
CAUTION: Because the Mighty Mule gate opener is battery powered, disconnect the opener ONLY  
when the power switch on the contol box is turned OFF. Unplugging the transformer does not turn power to  
the opener OFF.  
NOTE: Substitute a Pin Lock [FM133] for the clevis pin on the front  
mount of the gate opener to prevent unauthorized removal of the opener  
from the gate (page 26).  
rev 082211  
Mighty Mule FM402 Installation Instructions iii  
IMPORTANT SAFETY INSTRUCTIONS  
For The Consumer  
WARNING: To reduce the risk of injury or death:  
1. READ AND FOLLOW ALL INSTRUCTIONS. Failure to meet the requirements set forth in the instruction manual  
could cause severe injury or death, for which the manufacturer cannot be held responsible.  
2. When designing a system that will be entered from a highway or main thoroughfare, make sure the system is  
placed far enough from the road to prevent traffic congestion.  
3. The gate must be installed in a location that provides adequate clearance between it and adjacent structures when  
opening and closing to reduce the risk of entrapment. Swinging gates must not open into public access areas.  
4. The gate and gate opener installation must comply with any applicable local codes.  
I. Before Installation  
1. Verify this opener is proper for the type and size of gate, its frequency of use, and the proper class rating.  
2. Make sure the gate has been properly installed and swings freely in both directions. Repair or replace all worn  
or damaged gate hardware prior to installation. A freely moving gate will require less force to operate and will  
enhance the performance of the opener and safety devices used with the system.  
3. Review the operation of the system to become familiar with its safety features. Understand how to disconnect the  
opener for manual gate operation (page iii).  
4. This gate opener is intended for vehicular gates ONLY. A separate entrance or gate must be installed for  
pedestrian use (page vi).  
5. Always keep people and objects away from the gate and its area of travel. NO ONE SHOULD CROSS THE  
PATH OF A MOVING GATE.  
6. Pay close attention to the diagram below and be aware of these areas at all times.  
ZONE 1  
ZONE 2  
ZONE 2  
ZONE 5  
ZONE 5  
ZONE 3  
ZONE 3  
Driveway  
ZONE 4  
ZONE 4  
Gate in the  
Gate in the  
Open Position  
Open Position  
Entrapment Zones for a proper Pull-To-Open installation:  
Zone 1 – leading edge of the gates.  
Zone 2 – between the gate and the gate post.  
Zone 3 – the path of the gate.  
Zone 4 – the space between the gate in the open position and any object such as a wall, fence, etc.  
Zone 5 – pinch points between the opener and gate.  
iv Mighty Mule FM402 Installation Instructions  
rev 082211  
IMPORTANT SAFETY INSTRUCTIONS  
II. During Installation  
1. Install the gate opener on the inside of the property and fence line. DO NOT install an opener on the outside of the  
gate where the public has access to it.  
2. Be careful with moving parts and avoid close proximity to areas where fingers or hands could be pinched.  
3. Devices such as contact sensors (safety edges) and non contact sensors (photo beams) provide additional  
protection against entrapment.  
4. If push buttons or keypads are installed, they should be within sight of the gate, yet located at least 10 feet from  
any moving part of the gate (see diagram below). Never install any control device where a user will be  
tempted to reach through the gate to activate the gate opener.  
5. Do not activate your gate opener unless you can see it and can determine that its area of travel is clear of people,  
pets, or other obstructions. Watch the gate through its entire movement.  
6. Secure outdoor or easily accessed gate opener controls in order to prohibit unauthorized use of the gate.  
10'  
10'  
10'  
10'  
Moving Gate  
Area  
Moving Gate  
Area  
Driveway  
NEVER INSTALL  
any control device  
within gray area  
10'  
10'  
III. After Installation  
1. Attach the warning signs (included) to each side of the gate to alert the public of automatic gate operation. It  
is your responsibility to post warning signs on both sides of your gate. If any of these signs or warning decals  
become damaged, illegible or missing, replace them immediately. Contact GTO for free replacements.  
2. The gate is automatic and could move at any time, posing a serious risk of entrapment. No one should be in  
contact with an activated gate when it is moving or stationary.  
3. Do not attempt to drive into the gate area while the gate is moving; wait until the gate comes to a complete stop.  
4. Do not attempt to “beat the gate” (drive through) while the gate is closing. This is extremely dangerous.  
5. Do not allow children or pets near your gate. Never let children operate or play with gate controls. Keep ALL  
gate controls away from children and unauthorized users; store controls where children and unauthorized users do  
not have access to them.  
6. KEEP GATE AND GATE OPENER PROPERLY MAINTAINED. Always turn power to opener OFF before  
performing any maintenance. Regularly grease the gate hinges. Clean the push-pull tube with a soft, dry cloth and  
apply silicone spray to it at least once per month.  
rev 082211  
Mighty Mule FM402 Installation Instructions v  
IMPORTANT SAFETY INSTRUCTIONS  
7. To operate this equipment safely, YOU must know how to disconnect the opener for manual gate operation (page  
iii). If you have read the instructions and still do not understand how to disconnect the opener, contact the GTO  
Service Department.  
8. Disconnect the opener ONLY when the power is TURNED OFF and the gate is NOT moving.  
9. Make arrangements with local fire and law enforcement for emergency access.  
10. Distribute and discuss copies of the IMPORTANT SAFETY INSTRUCTIONS section of this manual with all  
persons authorized to use your gate.  
11. IMPORTANT: Save these safety instructions. Make sure everyone who is using or will be around the gate  
and gate opener are aware of the dangers associated with automated gates. In the event you sell the  
property with the gate opener or sell the gate opener, provide a copy of these safety instructions to the  
new owner.  
Should you lose or misplace this manual, a copy can be obtained by downloading one from the Mighty Mule  
Florida 32303 or by calling 1-800-543-4283 and requesting a duplicate copy. One will be provided to you free  
of charge.  
Required Safety Precautions for Gates  
Install Warning Signs  
Warning signs alert people of automatic gate operation and are required when installing the Mighty Mule Gate Opener.  
The Warning Signs included must be installed on both sides of each gate. Furthermore, a walk-through gate must be  
installed if pedestrian traffic is expected near the vehicular gate. We recommend using the GTO Bulldog Pedestrian Gate  
Lock [FM145] (page 26) for controlled access.  
Entrapment Protection  
GTO’s inherent obstruction settings, even when properly adjusted, may not be sensitive enough to prevent bodily  
injury in some circumstances. For this reason, safety devices such as safety edge sensors (or photoelectric sensors),  
which stop and reverse gate direction upon sensing an obstruction, are suggested for enhanced protection against  
entrapment.  
Bulldog Pedestrian  
Gate Lock  
(recommended, not included)  
Contact Sensor  
(recommended, not included)  
Warning Sign  
Vehicular Gate  
Warning Sign  
Vehicular Gate  
Pedestrian Gate  
Contact Sensor  
Contact Sensor  
Photo Beam  
Photo Beam  
Contact Sensor  
(recommended, not included)  
(recommended, not included)  
(recommended, not included)  
vi Mighty Mule FM402 Installation Instructions  
rev 082211  
IMPORTANT SAFETY INSTRUCTIONS  
Secondary Means of Protection Against Entrapment  
As specified by Gate Opener Safety Standard, UL 325 (30A.1.1), automatic gate openers shall have an inherent  
entrapment sensing system, and shall have provisions for, or be supplied with, at least one independent secondary  
means to protect against entrapment. The Mighty Mule utilizes Type A, an inherent (i.e., built-in) entrapment sensing  
system as the primary type of entrapment protection. Also, the Mighty Mule has provisions for the connection of Type  
B2 protection to be used as the secondary type of entrapment protection, if desired.  
1. For gate openers utilizing a contact sensor (e.g., safety edge sensor– Type B2) in accordance with UL 325 (51.8.4  
[i]):  
A. One or more contact sensors shall be located at the leading edge, bottom edge, and post edge, both inside and  
outside of a vehicular swing gate system.  
B. A hard wired contact sensor shall be located and its wiring arranged so that the communication between the  
sensor and the gate opener is not subjected to mechanical damage.  
C. A wireless contact sensor such as one that transmits radio frequency (RF) signals to the gate opener for  
entrapment protection functions shall be located where the transmission of the signals are not obstructed or  
impeded by building structures, natural landscaping or similar obstruction. A wireless contact sensor shall  
function under the intended end-use conditions.  
You may want to consider adding photo beams to your installation. GTO Photo Beams [R4222] provide a “non contact”  
means of entrapment protection. Call Mightgy Mule Sales at 1-800-543-GATE (4283) for more information.  
Leading Edge Contact Sensor  
on both sides of the gate  
Photo Beam  
Post Edge Contact Sensor  
on both sides of the gate  
Bottom Edge Contact Sensor  
on both sides of the gate  
Post Edge Contact Sensor  
on both sides of the gate  
Photo Beam  
ENTRAPMENT ALARM (UL 325; 30A.1.1A)  
The Mighty Mule Gate Opener is designed to stop and reverse within 2 seconds when the gate comes  
in contact with an obstruction. Additionally, these openers are equipped with an audio entrapment  
alarm which will activate if the unit obstructs twice while opening or closing. This alarm will sound for a  
period of 5 minutes, or until the opener receives an intended signal from a hard wired entry/exit source  
(e.g. push button control or keypad) and the gate returns to a fully open or fully closed position. Turning  
the power switch on the control box OFF and back ON will also deactivate the alarm. Wireless controls  
such as transmitters and wireless keypads will not deactivate the alarm.  
rev 082211  
Mighty Mule FM402 Installation Instructions vii  
IMPORTANT SAFETY INSTRUCTIONS  
!
GTO DC SWING SERIES  
Conforms to UL325  
5th Edition Standards  
Serial No.  
9901178  
MM402-0000000  
XXXXXX  
Gates That Open, LLC - Tallahassee, Florida USA  
Warning signs (4 enclosed) to be installed on both sides  
of each gate (3–5 feet above the bottom of the gate)  
Product identification label (2)  
installed under rear mount of each arm  
402  
DUAL GATE OPENER  
1-800-543-GATE (4283)  
TO MANUALLY OPEN AND CLOSE THE GATE  
1.Turn opener power switch OFF.  
2.Disconnect front and rear mount from mounting brackets.  
3.Remove opener from mounting brackets and move gate.  
Disconnect opener ONLY when the power switch is OFF and  
the gate is not moving.  
1. KEEP CLEAR! Gate may move at any time.  
2. Do not allow children to operate gate or play in gate area.  
3. This gate is for vehicles only. Pedestrians must use separate entrance.  
Control box label (1)  
installed on front of the control box  
Maximum Gate: 300 lbs. (136.1 kg); 12 ft. (3.7 m) • Voltage: 12 Vdc;  
Frequency: 0Hz; Power: 25W • Class I Vehicular Swing Gate Operator  
Logo and warning labels (4)  
installed on each side of opener housings  
viii Mighty Mule FM402 Installation Instructions  
rev 082211  
Technical Specifications  
MIGHTY MULE FM402 GATE OPENER  
_____________________________________  
_____________________________________  
DRIVE  
Low friction screw drive (linear actuator) rated for -5 °F to +160 °F (-20 °C to +71 °C).  
Powered by a 12 V motor with integral case hardened steel gear reducer. Motor speed reduced to 260 rpm.  
Maximum opening arc of 110°. Approximate opening time (90°): 18 seconds, depending on weight of gate.  
_____________________________________  
_____________________________________  
POWER  
The system is powered by a 12 Vdc battery.  
Battery charge is maintained by a 120 Vac, 14 Vac output transformer (20 VA) through the GTO control board  
or by optional GTO Solar Panels; the panel should generate minimum of 10 Watts. A diode on the control board  
prevents battery discharge. IMPORTANT: Never use both transformer and solar panel— this will damage the  
battery and control board.  
One (1) blade-style fuse is rated for 15 A.  
NOTE: The transformer should not be directly connected to any battery. Do not replace fuses with  
higher ampere rated fuses; doing so will void your warranty and may damage your control board.  
_____________________________________  
_____________________________________  
CONTROL  
GTO microprocessor-based control board is set for dual leaf, pull-to-open gate installations. Jumper can be  
removed to accommodate an optional kit for push-to-open gates.  
A circuit on the control board regulates charging. “Sleep draw” is 15 mA; “active draw” is 3 to 8 A.  
Auto-memorization of digital transmitter code.  
GTO RF receiver tuned to 318 MHz.  
3
Opener length with push-pull tube fully retracted is 26 /8", mounting point to mounting point. Maximum stroke is  
13".  
Adjustable auto-close timer (OFF to 3–120 seconds), and obstruction sensitivity (stall force).  
Power terminal block accommodates a transformer or solar panels.  
Accessory terminal block fully compatible with all Mighty Mule access controls.  
Control board allows connection of safety edge sensors and photoelectric sensors.  
Audio entrapment alarm sounds if unit encounters an obstruction twice while opening or closing.  
_____________________________________  
_____________________________________  
OPERATIONAL CAPACITY  
The Gate Capacity Chart shows approximate cycles, per day, you can expect from the Mighty Mule Automatic  
Gate Opener when powered with a transformer. Actual cycles may vary slightly depending upon the type and  
condition of gate and installation.  
Mighty Mule FM402 Gate Capacity/Cycle Chart  
Estimated number of daily cycles, based on use with a transformer.  
Number of Cycles Per Day  
300 lbs.  
150 lbs.  
100 lbs.  
50 lbs.  
39  
41  
44  
46  
5' - 6'  
36  
39  
41  
44  
8'  
34  
36  
39  
42  
10'  
31  
34  
36  
39  
12'  
An operation cycle is  
one full opening and  
closing of the gate.  
* These specifications are subject  
to change without notice.  
Gate Length  
NOTE: BALL BEARING HINGES SHOULD BE USED ON ALL GATES WEIGHING OVER 250 LB.  
To determine the number of cycles the gate opener will perform using solar panels, please see the specifications  
listed on page 2.  
rev 082211  
Mighty Mule FM402 Installation Instructions 1  
Before You Begin  
1. Determine Charging Options for Battery: Transformer OR Solar  
NEVER USE TRANSFORMER AND SOLAR PANEL(S) AT THE SAME TIME!  
It will damage the control board!  
IMPORTANT  
The battery charge is maintained by the 14 Volt transformer included OR optional solar panel(s). The transformer  
OR solar panel is connected to the control board using low voltage, 16 gauge, dual conductor, stranded, direct  
burial wire [RB509] (page 26).  
All low voltage wire used with the Mighty Mule Gate Opener must be 16 gauge dual conductor, stranded, direct  
burial wire.  
The transformer is intended for indoor use. If the transformer can only be plugged into an outside electrical  
outlet, a weatherproof cover or housing must be used.  
If your gate is more than 1000' from an AC power source, you will need to use a solar panel charging kit  
(minimum 10 watts). Refer to the Solar Panels and Gate Activity Chart below.  
Solar Panel and Gate Activity Chart  
The table and map illustrate the  
maximum number of gate cycles  
to expect per day in a particular  
area when using from 10 to 20  
watts of solar charging power.  
Dual Gate  
Winter Ratings  
Zone 1  
Zone 2  
Zone 3  
10 Watts  
8
16  
20  
28  
26  
30  
38  
15 Watts  
20 Watts  
11  
14  
The figures shown are for winter (minimum  
sunlight) and do not account for the use of  
any accessory items.  
Accessories connected to your system  
will draw additional power from the  
battery and will require additional solar  
panels.  
Zone 1  
NOTE: UP to 250 ft. of dual conductor, 16  
guage, stranded wire may be used to allow  
installation of solar panels in direct sunlight.  
Zone 3  
Zone 2  
See page 26:  
10 Watt Solar Panel [FM123]  
5 Watt Solar Panel [FM121]  
Zone 3  
Zone 3  
Zone 3  
2 Mighty Mule FM402 Installation Instructions  
rev 082211  
2. Check Direction of Gate Swing  
The Mighty Mule is designed for PULL-TO-OPEN installations. PUSH-TO-OPEN installations require two Push-To-Open  
brackets [FM148]. Push-to-Open Installation Instructions begin on page 19.  
Your Property  
Your Property  
Pull-To-Open  
Push-To-Open  
(arm retracts to open) (arm extends to open)  
3. Prepare the Gates  
Gates must be plumb, level, and swing freely on their hinges.  
Wheels must NOT be attached to the gates.  
The gates must move throughout their arcs without binding or dragging on the ground.  
Note that gates over 250 lb. should have ball bearing hinges with grease fittings.  
The gate post should be be secured in the ground with concrete so it will minimize twist or flex when the opener  
is activated.  
The addition of a horizontal or vertical cross member (if one is not already in place) to provide a stable area  
for mounting the gate bracket is also important.  
Trench the driveway in order to lay PVC conduit for the second opener power cable (see illustration on page 6).  
Horizontal Cross Member  
A
B
E
F
C
Vertical Cross Member  
A – Level  
B – Plumb  
D – Posts Secured in Concrete  
E – Centerline Mounting  
C – Free Swinging F – Good Working Hinges  
D
rev 082211  
Mighty Mule FM402 Installation Instructions 3  
Parts List – Opener and Mounting Hardware  
!
WARNING  
Installation DVD (1)  
GTO Transmitter(2)  
Battery (1)  
Moving Gate Can Cause  
Injury Or Death  
Transformer (1)  
1.  
KEEP CLEAR! Gate may move at any time.  
2.  
3.  
Do not allow children to operate gate or  
play in gate area.  
Control Box w/  
Battery Box (1)  
This gate is for vehicles only. Pedestrians  
must use  
a
separate entrance.  
Wire Harness (1)  
Warning Signs (4)  
Gate Bracket (2)  
Gate Opener (2)  
®
NER  
TE OPE  
-Z GA  
E
Closed Position  
Stop Plate (2)  
Post Bracket (2)  
Customer Support Card (1)  
Post Pivot Bracket (2)  
Hardware Bag Contents  
3/8" x 8" Bolt (4)  
3/8" Washer (12)  
3/8" x 2-3/4" Bolt (4)  
3/8" x 1-1/2" Bolt (2)  
5/16" x 1-1/2" Bolt (2)  
5/16" Washer (2)  
3/8" Lock Nut (10)  
5/16" Lock Nut (2)  
3/8" Bushings (2)  
3/8" x 1-1/2" Clevis Pin (4)  
Hairpin Clip (4)  
4 Mighty Mule FM402 Installation Instructions  
rev 082211  
Tools and Materials  
Tools Needed:  
• Power Drill  
1
9
• Open End Wrenches — /2" and /16"  
• Adjustable Wrench  
3
• /8" Drill Bit  
• Hacksaw or Heavy Duty Bolt Cutters  
• Small Flat Bladed Screwdriver  
• Large Phillips Screwdriver  
Tape Measure  
• Level  
• Wire Strippers  
• C-Clamps — small, medium, and large  
• Center Punch  
• Hammer (for center punch)  
• Extra person will be helpful  
Materials You May Need for the Installation:  
These items are NOT included with the gate opener kit. Some of these items can be purchased or special ordered  
Low voltage wire [RB509] will be needed to run from the transformer to the opener control board; length  
depends upon the distance between the transformer power supply and the control box. (Page 14 & 26)  
If your gate is more than 1000' away from an AC power source you will need to use at least one 10 Watt solar  
panel [FM123] or two 5 Watt panels (FM121) to charge the 12 Volt battery. (Page 2 & 26)  
PVC conduit for protecting wiring. (Page 6)  
Push-To-Open Brackets [FM148] are required if gates open out from property. (Page 3 & 26)  
Materials to reinforce thin walled tube or panel gates. (Page 7)  
Depending on the type of gate, a horizontal cross member or mounting plate may be needed to mount the front  
of the opener and gate bracket to the gate. (Page 3 & 7)  
Some installations may require muffler clamps for the gate bracket. (Page 7)  
(2)16 AWG crimp on fork lugs (Page 15)  
Surge protection for transformer. (Page 16)  
Weather proof outlet is required if transformer is plugged into outside outlet. (Page 16)  
Some types of installations require U-Bolts for closed position stop plate. (Page 11)  
A low profile ground stop is required for dual gates when using the Mighty Mule gate lock. (Page 11)  
rev 082211  
Mighty Mule FM402 Installation Instructions 5  
Installation Overview for Pull-To-Open Gates  
PUSH-TO-OPEN installation instructions begin on page 19.  
Example of an installation on a chain link fence:  
ControlBox/BatteryBox  
GateSwingsEvenlyandFreely  
HungFirmlyandPlumb  
120 Volt indoor  
Transformer  
FirstOpener  
GateBracket  
SecondOpener  
(surge protector  
not supplied)  
ClosedPosition StopPlates  
Run1000'(max.)oflow  
voltagewiretocontrolbox  
fromtransformer  
FencePost  
SetinConcrete  
36'powercableallowsthecontrol  
boardtocontroltheSECOND  
gateopener(runinPVCconduit)  
Youwillneedtotrenchacrossthe  
drivewayinordertolayconduitfor  
thesecondopenerpowercable.  
(wirenotincluded).  
PVCconduit(notincluded)  
toprotectwirefromlawn  
mowersandweedeaters.  
IMPORTANT: To achieve the most efficient  
leverage for the gate opener and ensure long  
trouble free service, the gate opener needs to  
be installed within the following parameters.  
Gate in the  
CLOSED POSITION  
1" minimum  
Pinch Area  
The diagram at left shows the optimum  
position for gate opener arm in relation to  
the gate in the open and closed positions.  
Be sure the position of the gate opener and  
brackets allows for 1" of clearance between  
the gate and the opener in both the open and  
closed position, at the same time maintaining  
a maximum distance of 13" from the end of the  
retracted opener arm to the gate bracket with  
the gate in the closed position.  
13" or less  
Pinch Area  
Gate in the  
OPEN POSITION  
1" minimum  
If the gate post is larger than  
6" the Post Pivot Bracket can  
be removed and the center  
hole of the Post  
Bracket can be the  
mounting point  
for the gate  
opener.  
Center hole of  
post bracket  
6 Mighty Mule FM402 Installation Instructions  
rev 082211  
Installation of the FIRST Gate Opener  
IMPORTANT: Determine which side of the driveway you will mount the control box. From this point on, the gate and  
gate opener on the same side as the control box will be referred to as the FIRST gate and gate opener. The gate and  
gate opener on the opposite side of the driveway from the control box will be referred to as the SECOND gate and gate  
opener.  
We recommend you position the opener near the centerline of the gate to keep the gate from twisting and flexing  
and to avoid backsplash from rain water.  
The Post Bracket Assembly  
Metal Plate  
Metal Plate  
Wooden Post  
Wooden Post  
The position of the post bracket assembly  
determines the leverage and efficiency of the  
opener. The post bracket assembly position  
also sets the clearance between the opener  
and the gate in the open and closed positions.  
The post bracket works well for  
Post Pivot  
Bracket  
Post  
installations on round and square fence  
posts. Because the post bracket carries the  
entire thrust of the active opener, bolts must  
completely penetrate the post.  
Post  
Bracket  
Bracket  
Post  
Pivot Bracket  
Post  
Bracket  
Post Bracket  
Assembly  
Post  
Pivot Bracket  
On wood posts, place a metal plate or  
washer (not supplied) between the nuts and  
the post to prevent the thrust of the opener  
from pulling the bolts and washers out of the  
wood.  
The post pivot bracket may not be necessary on posts larger than 6" in diameter (see page 6). Fence posts smaller  
than 6" in diameter or 6" square should be made of metal instead of wood to remain stable while the opener is moving  
the gate.  
Reinforcing Gates for the Gate Brackets  
We recommend using a muffler clamp, wood, or metal, to reinforce thin-walled tube gates, or wood to reinforce panel  
gates as shown. These reinforcement methods will prevent damage to the opener and gate. Additional hardware may be  
needed depending on the installation.  
Muffler Clamp  
(not supplied)  
Gate Bracket  
Muffler Clamp for  
Gate Bracket  
Thin Walled  
Tube Gate  
1" x 6" Wood  
Reinforcement  
Wood or Metal  
Reinforcement  
Gate Bracket  
Gate  
Bracket  
Wood or Metal  
Reinforcement  
(not supplied)  
Panel  
Gate  
1" x 6"  
Wood  
Reinforcement  
rev 082211  
Mighty Mule FM402 Installation Instructions 7  
Install Post Bracket Assembly and Gate Bracket  
Step 1  
3/8" x 11/2" Bolt  
3
1
Insert the /8" x 1 /2" bolt through the center hole of the post brackets  
3
3
and post pivot bracket. Secure with a /8" washer and /8" lock nut.  
DO NOT overtighten the lock nut (the post pivot bracket will have to be  
adjusted later).  
Post Pivot Bracket  
Step 2  
Attach post bracket assembly to the rear mount of the opener with a  
3
clevis pin and a /8" washer. Secure the clevis pin with a hairpin clip.  
Post Bracket  
3/8" Washer  
Clevis Pin  
Rear Mount  
3/8" Lock Nut  
3/8” Washer  
Opener  
Hairpin Clip  
Front Mount  
Post Bracket Assembly  
Clevis  
Pin  
Step 3  
Attach gate bracket to the front mount of the opener with a clevis pin  
3
and a /8" bushing. Secure the clevis pin with a hairpin clip.  
Bushing  
Gate Bracket  
Hairpin Clip  
Step 4  
With the gate in the fully open position and the opener arm fully retracted, adjust the post bracket assembly and  
gate bracket until the opener is level. While holding the opener level, use C-clamps to temporarily secure the post bracket  
assembly and gate bracket to the post and gate.  
Post Bracket Assembly  
Gate in Open Position  
Opener Arm Fully Retracted  
Level Opener  
LEVEL horizontal cross member  
Gate Bracket  
Fence Post  
8 Mighty Mule FM402 Installation Instructions  
rev 082211  
Gate in the  
CLOSED POSITION  
1" minimum  
Step 5  
Pinch Area  
Be sure the position of the gate opener and  
brackets allows for 1" of clearance between  
the gate and the opener in both the open  
and closed position, while at the same time  
maintaining a maximum distance of 13"  
from the end of the retracted opener arm to  
the gate bracket with the gate in the closed  
position. This mounting position will give the  
opener the most efficient leverage point for  
operation and provides the least possible  
pinch area  
13" or less  
Be sure gate opener  
and bracket don't bind.  
Pinch Area  
Gate in the  
OPEN POSITION  
Step 6  
After verifying that you have the best position  
for the post pivot bracket in the open position,  
5
1
1" minimum  
insert the /16" x 1 /2" bolt through the  
Determine Best  
5/16" x 11/2"  
Bolt  
aligned holes of the post bracket and post  
pivot bracket to hold it in place. Remove the  
clevis pin from the front mount and while  
supporting the gate opener, swing the gate  
and gate opener to the closed position. Again,  
check the clearance and be sure that the gate  
opener is not binding at the post pivot bracket.  
Hole Alignment  
to Achieve  
1" Clearance  
Post Pivot  
Bracket  
Post Bracket  
5/16" Washer  
If you don't have the required clearance, or if  
the gate opener is binding on the post pivot  
bracket, remove the /16" x 1 /2" bolt and  
5
1
5/16" Lock Nut  
readjust the post pivot bracket.  
TIP: Turn the post pivot bracket over for more  
hole alignment options. You can also move the  
entire post bracket assembly to different positions on the post.  
Step 7  
When the post bracket assembly is in the optimum position, reattach the opener to the gate bracket (gate in the open  
position); recheck the gate opener level; make sure the brackets are clamped securely.  
Step 8  
Mark reference points for bolt holes on the post through middle of post bracket assembly slots. Mark reference points for  
bolt holes on the gate cross member through middle of gate bracket slots. After marking your reference points, remove  
the opener and brackets from the fence and gate.  
Mark fence post through  
middle of bracket slots  
and drill /8" holes through  
Gate In Open Position  
Arm Fully Retracted  
3
LEVEL horizontal cross member  
post.  
Post Bracket  
Assembly  
Mark cross member through middle of gate  
bracket slots and drill 3/8" holes through cross member.  
rev 082211  
Mighty Mule FM402 Installation Instructions 9  
EXAMPLES  
TOP VIEW  
Step 9  
3
Drill /8" holes through post as marked. Fasten post bracket assembly  
Gate Bracket  
Mounting  
3
to the fence post using two /8" x 8" bolts, washers and lock nuts. You  
Examples  
must use bolts that completely penetrate the post.  
Round Metal Post  
Square Metal Post  
Step 10  
3
Drill /8" holes through the gate cross member as marked. Mount gate  
3
3
SIDE VIEW  
bracket using two /8" x 2 /4" bolts, washers, and lock nuts.  
NOTE: After the gate opener installation is complete and operation  
of the opener system has been tested, you should remove excess  
bolt length extending beyond the tightened nuts with a hacksaw or bolt  
cutters.  
Square Wood Post  
Remove excess bolt length  
with hacksaw or bolt cutters  
Round Wood Post  
Gate Bracket Mounting Examples  
FRONT VIEW  
SIDE VIEW  
SIDE VIEW  
FRONT VIEW  
Mounting Plate  
Created for  
Decorative Gate  
(required but not  
supplied)  
Round Tube & Chain Link Gate  
Remove excess bolt length  
with hacksaw or bolt cutters  
Square Tube Gate  
Attach Opener Arm  
Step 1  
Post Bracket Assembly  
bolted to fence post  
Attach the opener  
to the securely  
bolted post bracket  
assembly and gate  
bracket using clevis  
pins, bushings,  
and hairpin clips, or  
optional Pin Lock  
[FM133] (page  
Level Opener  
Gate Bracket bolted  
to gate cross member  
LEVEL horizontal cross member  
26). Verify that the  
opener is level and  
adjust the post  
bracket assembly, if  
necessary.  
Clevis Pin, Washer, and Hairpin Clip  
Gate In Open Position  
Clevis Pin, Bushing, and Hairpin Clip  
Fence Post  
Step 2  
Install the SECOND gate opener and hardware on the second gate following the same procedures as the FIRST gate  
opener and hardware ("Installing Post Bracket Assembly and Gate Bracket" Steps 1–10).  
NOTE: The power cable for the Second Opener should be run in PVC conduit under the driveway to protect it from  
damage due to lawnmowers, heavy equipment, etc. (See illustration on page 6.) NEVER SPLICE opener arm power  
cables. This will cause performance problems and may damage the opener.  
10 Mighty Mule FM402 Installation Instructions  
rev 082211  
Install the Closed Position Stop Plates  
The closed position stop plate is attached to the FIRST gate to help stabilize the gate leaf in the closed position. An  
optional low profile ground stop, when used with the closed position stop plate, provides a secure point for the SECOND  
gate to close against.  
To further enhance the stability and security of your gate, install a Mighty Mule Automatic Gate Lock [FM143] page 26).If  
you will be using the Mighty Mule Gate Lock with your gate opener system, the closed position ground stop is required.  
For Pull-to-Open systems, install the closed position stop plates on the inside of the gates.  
Optional Ground Stop  
(beneath gate)  
FIRST GATE  
SECOND GATE  
Closed Position  
Stop Plates  
CONTROL BOX  
For Push-to-Open systems, install the closed position stop plates on the outside of the gates.  
Step 1  
Closed Position Stop Plate mounted  
horizontally on metal post with U-bolts.  
Detach the gate opener arms from the gates and move the gates to the  
closed position.  
FACING VIEW  
Step 2  
Using appropriate hardware for your type of gate (U-bolts for tube or  
chain link; screw or bolts for wood or metal) attach the closed position  
stop plate (horizontally) about mid-height on the FIRST gate frame. Do  
not tighten it completely at this time. Slide the stop plate toward the  
frame of the SECOND gate leaf until they touch. Once you have moved  
the stop plate to the correct position, tighten its hardware completely.  
SECOND Gate Frame  
FIRST Gate Frame  
OVERHEAD VIEW  
Step 3  
The low profile ground stop may be made  
PostBracketAssembly  
of metal or concrete and should be firmly  
secured in the ground. The low profile ground  
stop should be installed beneath the SECOND  
GateBracket  
gate, positioned near the leading edge.  
ClosedPosition  
StopPlates  
LowProfileGroundStop  
(notincluded)  
rev 082211  
Mighty Mule FM402 Installation Instructions 11  
Closed Position Stop Plate mounted  
on the SECOND GATE  
Step 4  
Using appropriate hardware for your type of gate, attach the vertical  
closed position stop plate to the SECOND gate frame at the point  
where it will come in contact with the low profile ground stop. Do not  
tighten it completely at this time. You must slide the closed position  
stop plate toward the low profile ground stop until they touch. Once  
you have moved the stop plate to the correct position, tighten its  
hardware completely.  
SIDE VIEW  
Closed Position Stop Plate  
Low Profile Ground Stop  
in Near the Center of Driveway  
FACING VIEW  
Step 5  
Return the gates to their open positions and  
reattach the gate openers to the gates.  
Low Profile Ground Stop  
Closed Position  
Stop Plate  
Closed Position  
Stop Plate  
Mount the Battery Box and Control Box  
Step 1  
Remove the Control box from the Battery Box  
Battery Box  
Illustration A  
Screw Placement Guides  
by removing the three screws as shown in  
Illustration A.  
Step 2  
Mount the Battery Box using the screws  
(provided) or another secure mounting method.  
The battery/control box must be mounted at  
least 3 feet above the ground to protect it from  
rain splash, snow, etc., and at least 3 feet  
from an AC power source to prevent electrical  
interference.  
Control Box  
Control Box  
Step 3  
Slide the battery into position with the terminals at  
the TOP (see Illustration B).  
!
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ARNING  
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Piece of Wood  
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Illustration B  
12 Mighty Mule FM402 Installation Instructions  
rev 082211  
Connecting the Battery  
Step 4  
Battery  
Verify that the ON/OFF switch is in the OFF position.  
Connect the BATTERY WIRE HARNESS wires to the  
battery --- RED wires to POSITIVE (+) battery terminal  
and BLACK wires to NEGATIVE (–) battery terminal.  
The BATTERY WIRES from the CONTROL BOARD  
should extend through the KNOCK-OUT in the back  
of the CONTROL BOX. Plug the BATTERY HARNESS  
wires into the wires coming from the CONTROL BOX.  
Battery Wire Harness  
with In-Line Fuse  
Back of  
Control Box  
Battery Box  
Step 5  
Tuck the excess battery leads into the battery box and  
reattach the CONTROL BOX to the BATTERY BOX.  
Control Box  
Remove the Control Box Cover  
Control Board  
Step 6  
Remove the four (4) control box cover screws and remove  
the cover to access the CONTROL BOARD.  
Step 7  
Attach antenna to control  
box cover. First, remove the  
Phillips screw (labeled ANT)  
from the control box cover.  
Place one end of the antenna  
coil over the antenna plug  
(antenna wire will fit into  
groove). Tighten the Phillips  
screw to secure antenna.  
Control Box Cover  
rev 082211  
Mighty Mule FM402 Installation Instructions 13  
Connect Opener Power Cables  
STATUS  
120  
Step 1  
1st OPR.  
JOG CLOSE  
OPEN  
<
>
Bring FIRST power cable into the control box through a strain relief slot,  
leaving enough wire to reach the FIRST OPR. terminal block.  
MIN  
2nd OPR.  
MAX OFF  
SEC.  
STALL FORCE AUTO CLOSE  
SET  
LIMIT  
PWR.  
REMOVE JUMPER FOR  
PUSH TO OPEN OPTION  
Insert the individual power cable wires into appropriate terminals on the  
FIRST OPR. terminal block (white to WHT; green to GRN; red to RED;  
black to BLK). Tighten the set screws. A dab of petroleum jelly on each  
terminal will help prevent corrosion.  
SFTY.  
EXIT  
JP1  
VAR1  
VAR2  
CYCLE  
EDGE  
SENSOR  
VAR3  
VAR4  
COMMON  
VAR5  
LOCK+  
LOCK–  
PF1  
K1  
WHT  
GRN  
K2  
RED  
BLK  
Step 2  
BATT  
+
BATT  
Pull the 36' second opener power cable through the PVC conduit and  
secure in the driveway slot/trench (see pages 6 and 14).  
WHT  
GRN  
K3  
K4  
RED  
BLK  
14 VAC  
OR  
SOLAR  
VAR6  
Step 3  
ON OFF  
Insert the SECOND power cable into a strain relief slot at the bottom  
of the control box, leaving enough wire to reach the SECOND OPR.  
terminal block.  
FIRST Opener  
Power Cable  
Strain Relief Slots  
Insert the individual power cable wires into appropriate terminals on  
the SECOND OPR. terminal block (white to WHT; green to GRN; red to  
RED; black to BLK). Tighten the set screws.  
(Battery Wires Not Shown)  
SECOND Opener  
Power Cable  
Correct  
Wrong  
Wrong  
Terminal  
Block  
Screwedinto  
wireinsulation.  
Exposedstrands  
ofwire.  
Wire  
Connect the Transformer (*Solar Instructions on Page 21)  
NEVER USE TRANSFORMER AND SOLAR PANEL(S) AT THE SAME TIME!  
IMPORTANT INFORMATION ABOUT LOW VOLTAGE WIRE:  
The only wire acceptable for use with GTO products is 16 gauge stranded, low voltage, direct burial wire. This  
particular gauge enables the transformer to provide an adequate charge through the control board to the battery  
at distances up to 1000'.  
DO NOT use telephone wire or solid core wire. Unlike stranded wire, these types of wire are inadequate for use  
with your gate opener system.  
NEVER splice wires together. Splicing permits corrosion and seriously degrades the wire's ability to carry an  
adequate current.  
Step 1  
Make sure the power switch is OFF.  
Step 2  
Select the electrical outlet where you will plug the transformer. Measure  
the distance from this outlet to the control box following the path  
where the wire will be laid. After you have measured how much wire is  
needed, cut the wire to the appropriate length (up to 1000').  
ON/OFF  
Switch  
ON/OFF  
14 Mighty Mule FM402 Installation Instructions  
rev 082211  
Step 3  
Control and Battery Box  
Lay the measured length of low voltage wire  
in a trench following a path from the selected  
electrical outlet to the control box. Wires coming  
up from the ground should be run through PVC  
conduit to protect them from lawn mower blades,  
weedeaters, and grazing animals. Be sure to  
First Gate Opener  
120 Volt indoor  
Transformer  
bury the wire laid in the trench.  
(surge protector  
not supplied)  
Run 1000' (max.) of low  
voltage wire to control  
box from transformer  
(wire not included).  
STATUS  
PVC conduit (not included)  
to protect wire from lawn  
mowers and weed eaters.  
1st OPR.  
OPEN  
<
JOG  
>
CLOSE  
MIN  
120  
2nd OPR.  
MAX OFF  
SEC.  
STALL FORCE AUTO CLOSE  
SET  
LIMIT  
PWR.  
REMOVE JUMPER FOR  
PUSH TO OPEN OPTION  
SFTY.  
EXIT  
JP1  
VAR1  
VAR2  
CYCLE  
EDGE  
SENSOR  
VAR3  
VAR4  
Step 4  
COMMON  
VAR5  
LOCK+  
LOCK–  
Bring enough wire up through the PVC conduit to reach the control  
board.  
PF1  
K1  
WHT  
GRN  
K2  
RED  
BLK  
Step 5  
BATT  
+
BATT  
WHT  
GRN  
K3  
K4  
3 16  
Strip / " off the ends of the low voltage wire and twist tightly. Attach  
RED  
BLK  
these ends to the 14VAC OR SOLAR terminals located on the terminal  
block). Be certain not to let the exposed wires touch each other!  
14 VAC  
OR  
SOLAR  
VAR6  
Insert one transformer wire into a 14VAC OR SOLAR terminal. Insert the  
other transformer wire into the remaining 14VAC OR SOLAR terminal.  
The transformer wires can be connected to the 14VAC OR SOLAR  
terminals regardless of color/polarity.  
ON OFF  
Low Voltage Wire from  
Transformer or Solar  
Tighten set screws against exposed end of wires.  
K3  
K4  
WHT  
GRN  
Step 6  
1
At the AC outlet, strip /2" of insulation from the ends of the low voltage  
RED  
BLK  
wire. Attach these stripped ends to the transformer terminals. We  
suggest adding crimp on fork lugs to the end of each wire before  
attaching it to the transformer.  
14 VAC  
OR  
SOLAR  
Make sure the exposed wires do not  
touch each other!  
Low Voltage Wire  
from Transformer  
or Solar Panel  
VAR6  
ON OFF  
rev 082211  
Mighty Mule FM402 Installation Instructions 15  
Step 7  
Plug the transformer into the electrical outlet. Use of a surge protector  
with the transformer is strongly recommended. If electrical outlet is  
located outdoors, outlet and transformer should be protected by a  
weatherproof cover.  
Transformer  
Set the CLOSED Position Limit for PULL-TO-OPEN Installation  
Your transmitter must be able to operate the gate. If not, see "Personalize Your Transmitter Setting" on page 18.  
Note: The OPEN limit is when the opener is fully retracted and the gate is in the full open position. The open limit setting  
can only be adjusted by moving the gate bracket. To achieve the optimum closed position, you must adjust the CLOSED  
limit setting:  
Step 1  
FIRST Opener  
JOG Buttons  
STATUS  
Make sure the Control Box is ON and that  
the gate is in the OPEN POSITION (arms fully  
retracted).  
1st OPR.  
OPEN < JOG > CLOSE  
SECOND Opener  
JOG Buttons  
MIN  
120  
2nd OPR.  
SET  
MAX OFF  
SEC.  
STALL FORCE AUTO CLOSE  
Step 2  
PWR.  
LIMIT  
Press and HOLD the 2nd Opener CLOSE  
button on the control board and be prepared  
to RELEASE the button when the gate reaches  
the desired closed position/limit. Use the JOG  
OPEN and CLOSE buttons to "fine tune" the  
gate position if neccessary.  
REMOVE JUMPER FOR  
PUSH TO OPEN OPTION  
SET LIMIT Button  
SET LIMIT Light  
Step 3  
Press and HOLD the 1st Opener CLOSE button  
on the control board and be prepared to RELEASE the button when the gate reaches the desired closed position/limit.  
Use the JOG OPEN and CLOSE buttons to "fine tune" the gate position if neccessary.  
Step 4  
With the gates in in the desired closed positions PRESS and HOLD the SET LIMIT button until the alarm and RED Light  
come on. Then release the button.  
NOTE: The opener must be extended more than 7 inches to set limits.  
Step 5  
NOTE: When the control box cover is removed the receiver range is reduced to less than 5 feet.  
Press the transmitter button once (within 5 feet of the control board) and allow the gates to fully open. The alarm will beep  
once when both gates reach the OPEN LIMIT. This indicates the limits for both arms are programmed in memory.  
Step 6  
Press the transmitter button and allow the gates to fully close to verify that they stop at the desired positions. Repeat  
Steps 2-5 if correction is needed.  
16 Mighty Mule FM402 Installation Instructions  
rev 082211  
Adjust the Stall Force Setting  
The Stall Force potentiometer controls the the amount of force the  
opener will apply against an obstruction before it stops and reverses  
direction within two seconds.  
STATUS  
OPR.  
G
>
CLOSE  
MIN  
120  
MAX OFF  
IMPORTANT: The Stall Force setting will need to be adjusted to  
compensate for the weight and size of your gates. For safety reasons,  
use the lowest possible setting to operate the gate.  
SEC.  
STALL FORCE AUTO CLOSE  
REMOVE JUMPER FOR  
PUSH TO OPEN OPTION  
MIN  
STALL FORCE  
MAX  
The Stall Force potentiometer on the control board operates like a  
volume control on a radio. Use a small flat blade screwdriver to turn the  
arrow in the center of the potentiometer. Adjust the sensitivity from the  
MINIMUM position just to the point where the gates operate smoothly  
without obstructing from their own weight or wind conditions.  
NOTE: You may need to increase the stall force in cold weather due to increased resistance from gate hinges.  
Set Auto-Close Time  
STATUS  
The Auto-Close determines how long the gate will remain open before  
OPR.  
G
>
CLOSE  
it automatically closes. The factory setting is OFF. Use a small flat  
blade screwdriver, you can adjust the settings to OFF, or from 3 to 120  
seconds.  
MIN  
120  
PR.  
AX OFF  
SEC.  
STALL FORCE AUTO CLOSE  
T  
T  
REMOVE JUMPER FOR  
PUSH TO OPEN OPTION  
NOTE: Auto-Close timer is disabled (gate will not automatically close)  
if gate is not at the fully open position.  
120  
OFF  
SEC.  
AUTO CLOSE  
rev 082211  
Mighty Mule FM402 Installation Instructions 17  
Personalize Your Transmitter Setting  
All GTO transmitters have a standard setting and are ready to operate  
your Mighty Mule Gate Opener. For your safety and security, we  
strongly recommend that you replace the factory setting with your own  
personal setting.  
NOTE: If you have multiple transmitters, you should adjust all of them  
at this time.  
LED  
Step 1  
1
+
2
0
3
Use a small phillips head screw driver to remove the transmitter cover.  
4
5
6
7
8
A23S 12V  
9
ALKALINE BA  
ECE  
Step 2.  
T
T
ERY  
Set the transmitter DIP switches using a small screwdriver. There are  
nine (9) transmitter DIP switches; each can be placed in three different  
positions (+, 0, –). DO NOT set all the switches in the same position,  
such as all +, all 0, or all –. Once the DIP switches have been reset,  
replace and close the access cover.  
WARNING: No other adjustments should be made inside the  
transmitter.  
+1 2 3 4 5 6 7 8 9  
0
Step 3.  
ECE  
Program the new setting in the control board memory.  
A. Slide the control box ON/OFF switch to the OFF position.  
B. Press and hold the transmitter button while sliding the ON/OFF  
switch to the ON position.  
C. Continue to hold the transmitter button until the alarm sounds  
(3-5 seconds).  
D. Release the transmitter button. The new transmitter setting is  
now programmed.  
E. Verify that the transmitter operates the gate.  
NOTE: It is NOT necessary to remove the cover of the control box to  
program the new transmitter code, but when the control box cover is  
removed the receiver range is reduced to less than 5 feet.  
ON/OFF  
Switch  
ON/OFF  
FCC WARNING: Changes or modifications to this unit not expressly approved by the party responsible for compliance could void the user’s  
authority to operate the equipment. In accordance with FCC Part 15, Section 15.21, the manufacturer is not responsible for any radio or TV  
interference caused by unauthorized modifications to this equipment. Such modifications could VOID the user authority to operate the equipment.  
NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules.  
These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates,  
uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to  
radio communications. The external solid wire antenna was used during FCC testing. Substitutes should not be used.  
However, there is no guarantee that interference will not occur in particular installations. If this equipment does cause harmful interference to radio  
or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference  
by one or more of the following measures: • Increase the separation between the equipment and the receiver. • Connect the equipment into an  
outlet on a circuit different from that which the receiver is connected. • Consult the dealer or an experienced radio/TV technician for help.  
18 Mighty Mule FM402 Installation Instructions  
rev 082211  
Push-To-Open Installation Instructions  
PUSH-TO-OPEN gates open out from the property (opener arms extend to open). Push-To-Open Brackets are required  
for this type of installation, one for each gate [FM148] page 26. In a Push-To-Open installation, the opener is installed  
while the gate is in the closed position and the opener fully retracted.  
Swinging gates MUST NEVER open into public access areas!  
Step 1: Read "Installation of the Gate Opener" on page 7.  
Step 2: Determining The Mounting Position of The Post Bracket Assembly  
3
1
A. Insert the /8" x 1 /2" bolt through the center hole of the post  
3
3
1
brackets and post pivot bracket. Secure with a /8" washer  
and /8" lock nut. DO NOT overtighten the lock nut (the post  
/8" x 1 /2" Bolt  
3
Push-To-Open Bracket  
(optional accessory FM148)  
pivot bracket will have to be adjusted later). Attach post  
bracket assembly to the rear mount of the opener with a clevis  
3
pin and a /8" washer. Secure the clevis pin with a hairpin  
clip. Attach gate bracket to the front mount of the opener with  
a clevis pin and a /8" bushing. Secure the clevis pin with a  
Post Bracket  
3
hairpin clip.  
3
/8" Washer  
B. With the gate in the closed position (up to 110º from its open  
position), and the opener fully retracted, adjust the post  
bracket assembly and gate bracket until the opener is level.  
While holding the opener level, use C-clamps to temporarily  
keep the post bracket assembly and gate bracket in their  
respective positions on the fence post and gate.  
3
/8" Lock Nut  
Push-To-Open Bracket Assembly  
IMPORTANT: Be sure the position of the gate opener and  
brackets allows for 1" of clearance between the gate and the  
opener in both the open and closed position, while at the same  
time maintaining a maximum distance of 13" from the end of  
the opener arm to the gate bracket with the gate in the open  
position. This mounting position will give the opener the most  
efficient leverage point for operation and provides the least  
possible pinch area.  
13" maximum  
Gate in the Open Position  
Pinch Area (gray)  
C. After verifying that you have the best position for the post  
1" minimum  
5
1
pivot bracket in the closed position, insert the /16" x 1 /2" bolt  
through the aligned holes of the post bracket and post pivot  
bracket to hold it in place. Remove the clevis pin from the front  
mount and while supporting the gate opener, swing the  
gate and gate opener to the open position. Again, check the  
clearance and be sure that the gate opener is not binding at  
the post pivot bracket.  
Gate in the Closed Position  
Pinch Area (gray)  
IMPORTANT: If you don't have the required clearance, or if  
5
1
the gate opener is binding, remove the /16" x 1 /2" bolt and  
readjust the post pivot bracket. TIP: Turn the post pivot bracket  
over for more hole alignment options.  
1" minimum  
D. When the post pivot bracket assembly is in the optimum  
position, reattach the opener to the gate bracket (gate in the  
closed position); recheck the gate opener level; make sure the brackets are clamped securely. Mark reference  
points for bolt holes on the post through middle of post bracket slots. Mark reference points for bolt holes on the  
gate cross member through middle of gate bracket slots. After marking your reference points, remove the opener  
and brackets from the post and gate.  
3
3
E. Drill /8" holes through post as marked. Fasten post bracket assembly to the post using two /8" x 8" bolts,  
3
washers and lock nuts. You must use bolts that completely penetrate the post. Drill /8" holes through the  
gate cross member as marked. Mount gate bracket using two /8" x 2 /4" bolts, washers, and lock nuts.  
3
3
rev 082211 Mighty Mule FM402 Installation Instructions 19  
Step 3: Attach Opener Arm (page 10)  
Step 4: Install Closed Position Stop Plates (page 11)  
Step 5: Install the Control / Battery Box (page 12)  
Step 6: Connect Battery Harness (page 13)  
Step 7: Connect Opener Power Cables (page 14)  
Step 7: Connect the Transformer (page 14) OR Solar Charger (page 21)  
Step 8: Remove Push-To-Open Jumper  
A. Make sure the control box power switch is OFF.  
STATUS  
1st OPR.  
JOG CLOSE  
B. Use small pliers to remove the JUMPER for PUSH-TO-OPEN  
applications.  
OPEN  
<
>
MIN  
120  
2nd OPR.  
MAX OFF  
SEC.  
C. Turn power switch ON. The control board is now configured to  
push the gate open. (Keep the jumper, as it is necessary if there  
is ever a need to convert the opener for Pull-To-Open.)  
STALL FORCE AUTO CLOSE  
SET  
LIMIT  
PWR.  
REMOVE JUMPER FOR  
PUSH TO OPEN OPTION  
Step 9: Set the Open Position Limit (Push-to-Open)  
Push-To-Open Jumper  
The CLOSED limit is when the opener is fully retracted and the gate is  
in the closed position. The closed limit setting can only be adjusted by moving the gate bracket. To acheive the optimum  
open position, you must adjust the OPEN Limit setting:  
A. If not already ON slide the ON/OFF switch on the Control Box to the ON position and make sure the arms are in  
the CLOSED POSITION (fully retracted).  
B. Press and HOLD the FIRST Opener OPEN button on the control board and be prepared to RELEASE the button  
when the gates reached the desired open position/limit. Use the JOG OPEN and CLOSE buttons to "fine tune"  
the gate position if neccessary.  
C. Press and HOLD the SECOND Opener  
FIRST Opener  
JOG Buttons  
STATUS  
OPEN button on the control board and  
be prepared to RELEASE the button  
when the gates reached the desired  
open position/limit. Use the JOG  
OPEN and CLOSE buttons to "fine  
tune" the gate position if neccessary.  
1st OPR.  
OPEN < JOG > CLOSE  
SECOND Opener  
JOG Buttons  
MIN  
120  
2nd OPR.  
SET  
MAX OFF  
SEC.  
STALL FORCE AUTO CLOSE  
PWR.  
LIMIT  
REMOVE JUMPER FOR  
PUSH TO OPEN OPTION  
D. NOTE: The opener arms must be  
extended more than 7 inches to set  
limits. With the gates in in the desired  
open positions PRESS and HOLD the  
SET LIMIT button until the alarm and  
RED Light come on. Then release the  
button.  
SET LIMIT Button  
SET LIMIT Light  
E. NOTE: When the control box cover is removed the receiver range is reduced to less than 5 feet. Press the  
transmitter button once and allow the gates to fully close. The alarm will beep once when both gates reach the  
CLOSED LIMIT. This indicates the LIMITS for both arms are learned and stored in memory.  
F. Press the transmitter button and allow the gates to fully open to verify that they stop at the desired positions.  
Repeat Steps B – E if correction is needed.  
Note: Must have a transmitter that operates the gate. If not, see Personalize Your Transmitter Setting on page 18.  
Step 10: Adjust Stall Force Setting (page 17)  
Step 11: Set Auto Close Time (page 17)  
Step 12: Personalize Transmitter Settings (page 18)  
20 Mighty Mule FM402 Installation Instructions  
rev 082211  
Solar Panel Instructions  
NEVER USE TRANSFORMER AND SOLAR PANEL(S) AT THE SAME TIME!  
It will damage the control board!  
IMPORTANT INFORMATION ABOUT LOW VOLTAGE WIRE:  
The only wire acceptable for use with GTO products is 16 gauge stranded, low voltage, PVC sheathed wire. This  
particular gauge enables the solar panel to provide an adequate charge through the control board to the battery  
at distances up to 250'.  
DO NOT use telephone wire or solid core wire. Unlike stranded wire, these types of wire are inadequate for use  
with your gate opener system.  
Step 1  
Make sure the power switch is OFF.  
ON/OFF  
Switch  
ON/OFF  
Step 2  
Strip 3/16" off the ends of the low voltage wire and twist tightly. Attach  
these ends to the 14VAC OR SOLAR terminals located on the terminal  
block. Be certain not to let the exposed wires touch each other!  
STATUS  
120  
1st OPR.  
JOG CLOSE  
OPEN  
<
>
MIN  
2nd OPR.  
MAX OFF  
SEC.  
STALL FORCE AUTO CLOSE  
SET  
LIMIT  
PWR.  
REMOVE JUMPER FOR  
PUSH TO OPEN OPTION  
SFTY.  
EXIT  
WHT  
GRN  
K3  
K4  
JP1  
VAR1  
VAR2  
Step 3  
CYCLE  
EDGE  
SENSOR  
VAR3  
VAR4  
RED  
BLK  
Insert one solar panel wire into a 14VAC OR  
SOLAR terminal. Insert the other solar panel  
wire into the remaining 14VAC OR SOLAR  
terminal. The wires can be connected to the  
14VAC OR SOLAR terminals regardless of  
color/polarity.  
COMMON  
VAR5  
LOCK+  
LOCK–  
14 VAC  
OR  
SOLAR  
PF1  
K1  
WHT  
GRN  
Low Voltage Wire  
from Transformer  
or Solar Panel  
VAR6  
K2  
ON OFF  
RED  
BLK  
BATT  
+
BATT  
WHT  
GRN  
K3  
K4  
RED  
BLK  
14 VAC  
OR  
SOLAR  
VAR6  
ON OFF  
Step 4  
Tighten set screws against exposed end of wires. A dab of household  
petroleum jelly on each terminal will help prevent corrosion.  
Low Voltage Wire from  
Transformer or Solar  
NOTE: For multiple panels, wire the panels in  
parallel as shown in this diagram.  
Solar Panels connect in PARALLEL  
RED  
RED  
BLACK  
BLACK  
rev 082211  
Mighty Mule FM402 Installation Instructions 21  
Connecting Accessories and Safety Devices  
Although GTO strongly recommends the use of additional safety devices, we do not endorse any specific brands.  
Only use products that are certified and listed to be in compliance with any applicable UL standards  
(Underwriters Laboratories) and national and regional safety codes.  
Call GTO Sales at 1-850-575-0176 for information on compatible products for your specific application.  
Step 1  
Turn control box OFF before connecting safety device wires to the control board. (Unplugging the transformer does not  
turn power to the opener OFF.)  
Step 2  
Run wires from safety devices and other accessories through the strain relief openings in the bottom of the control box.  
Step 3:  
Follow directions in Accessory Installation Manuals.  
STATUS  
FIRST OPR.  
SECOND OP  
1st OPR.  
JOG CLOSE  
OPEN  
<
>
7
8
MIN  
120  
2nd OPR.  
MAX OFF  
SEC.  
STALL FORCE AUTO CLOSE  
2
3
4
5
6
SET  
LIMIT  
PWR.  
REMOVE JUMPER FOR  
PUSH TO OPEN OPTION  
SFTY.  
EXIT  
JP1  
VAR1  
VAR2  
8
CYCLE  
EDGE  
VAR3  
VAR4  
SENSOR  
7
COMMON  
VAR5  
LOCK+  
LOCK–  
C
I
T
PF1  
A
O
L
®
M
K
C
O
T
U
L
A
E
OCK  
T
A
RITY  
G
K1  
WHT  
GRN  
ELECTRONIC SECU  
K2  
RED  
BLK  
Automatic Gate Lock  
BATT  
+
BATT  
WHT  
GRN  
K3  
K4  
5
RED  
BLK  
6
14 VAC  
OR  
SOLAR  
VAR6  
Edge Sensor  
ON OFF  
6
Accessory Wire  
2
4
6
Push Button Control  
Photo Beams  
Blue  
Black  
3
6
Red  
Yellow  
Shield  
+
-
2
3
1
ABC  
DEF  
5
6
4
JKL  
MNO  
GHI  
6
4
8
9
7
TUV  
WXY  
PRS  
0
Gate Opening Sensor  
Refer to Sensor manual for  
additional information if needed.  
Digital Keypad  
NOTE: Connections are for typical applications. For additional connection options not  
illustrated here refer to the accessory manual for details.  
22 Mighty Mule FM402 Installation Instructions  
rev 082211  
SET  
LIMIT  
Accessory Inputs  
REMOVE JUMPER FOR  
PUSH TO OPEN OPTION  
SAFETY: Typically for use with photo beam device, loop  
detector or other non-contact sensors  
1
1
2
3
4
Activation of this input while the gate is closing will cause the  
gate to stop and return to the opened position.  
SFTY.  
EXIT  
VAR1  
VAR2  
Activation of this input while the gate is opening has no effect.  
(gate will continue to open)  
CYCLE  
EDGE  
SENSOR  
VAR3  
VAR4  
Activation of this input while gate is idle will prevent gate from  
closing.  
COMMON  
5
VAR5  
Activation of this input while at open limit will restart the auto  
close time (if enabled).  
LOCK+  
LOCK–  
6
7
PF1  
EXIT: Typically for use with exit loop or wand  
2
K1  
WHT  
GRN  
Activation of this input will open the gate if it’s not already at the  
open position.  
K2  
RED  
BLK  
Activation of this input while at open limit will restart the auto  
close time (if enabled).  
BATT +  
Activation of this input while gate is idle will prevent gate from  
closing.  
BA  
K3  
WHT  
GRN  
CYCLE: Typically for use with doorbell button or hardwired  
keypad  
3
RED  
BLK  
K4  
Each activation at this input will cycle the operation as follows:  
…→ OPEN → STOP → CLOSE → STOP → OPEN → …  
14 VAC  
OR  
SOLAR  
EDGE SENSOR: Typically for use with contact edge sensor  
4
8
Activation of this input while gate is moving will cause it to  
reverse direction for 2 seconds.  
VAR6  
Activation of this input while idle will prevent gate from running.  
ON OFF  
COMMMON: Common/Negative terminal for accessory  
devices.  
5
12 Volt Power (Maximum Current: 100 mA)  
COM: Common/Negative terminal for accessory power source.  
5
6
LOCK +: Power source for GTO/Mighty Mule accessories, i.e. Gate Opening Sensor [FM138].  
Lock Outputs  
LOCK +: Positive terminal to connect Automatic Gate Lock [FM143].  
6
7
LOCK – : Negative terminal to connect Automatic Gate Lock.  
Charge Power Inputs  
14VAC or SOLAR: Power Input Terminals:  
8
Input terminals for transformer or solar panel.  
Non-polarity sensitive.  
rev 082211  
Mighty Mule FM402 Installation Instructions 23  
Troubleshooting Guide  
If your gate opener does not function properly, use this guide or use the online troubleshooter at  
http://support.gtoinc.com before calling the GTO Service Department.  
VISUAL AND AUDIBLE DIAGNOSTIC INDICATORS  
1. VISUAL INDICATORS:  
a. Power LED (Green):  
• ON: AC power or Solar power is present.  
• OFF: There is no input power.  
b. Status LED (Yellow): (while unit is running this LED will be OFF)  
• Rapid blinking in random pattern: GTO’s transmitter 318 MHz signal is detected.  
• Continuously ON: Battery is in fast charge mode.  
• 1 Blink every 2 seconds: Battery is in float charge mode (battery is fully charged)  
• OFF: Switch is in the OFF position or there is no input power for at least 60 seconds.  
2. AUDIBLE INDICATORS (ALARM/BUZZER):  
a. Beeps upon power up:  
• This is normal self test when the unit is turned on.  
b. Continuous beep after power up:  
• Unit has learned new transmitter code, releasing the transmitter button will shut off  
the alarm.  
c. Rapid beeping:  
• Unit has encountered two (2) obstructions without reaching either limit. (Power cycle to reset the alarm)  
Transmitter will not operate the gate.  
• Alarm will automatically shut off after 5 minutes; gate will remain disabled until control box is restarted.  
d. 1 beep every 20 seconds:  
• Low battery is detected.  
e. 1 beep every 2 second:  
• Position sensor is open circuit. Call GTO Service department.  
f. 2 beeps every 2 second:  
• Position sensor is short circuit. Call GTO Service department.  
g. 1 beep when attempting to activate the opener:  
• Blown fuse.  
• Battery is extremely low or damaged.  
• Loose connection from battery to circuit board.  
3
. IF THE GATE STOPS AND REVERSES DIRECTION  
1. Check the gate for binding or hinge damage.  
2. Adjust stall force if necessary.  
3. Reprogram closed position limits.  
4. Check the position of the mounting brackets and readjust if necessary.  
24 Mighty Mule FM402 Installation Instructions  
rev 082211  
VOLTAGE READINGS  
14 Vac Transformer _____________ 13.0 to 16.0 Vac  
10 W Solar panel _______________ 18.0 to 22.0 Vdc 600 mA  
Measure voltage at panel and control box.  
12 V Battery ____________________ 12.5 to 13.5 Vdc  
Charging circuit ________________ 13.8 to 14.8 Vdc  
Measure voltage at battery terminals with battery connected.  
Gate and Opener Maintenance:  
1. Keep gates properly maintained. Grease hinges. Make sure gates remain level. Replace worn or damaged  
hardware. On gates over 250 lbs, grease ball bearing hinges at least 4 times annually (more if in a coastal area).  
2. Service the gate opener regularly (make sure control box is OFF). Clean extended opener arm with a soft, dry, cloth  
and apply high quality silicone spray once a month. Replace battery every 1–2 years.  
Warranty Repair  
If your Mighty Mule Gate Opener is not operating properly, please follow the steps below:  
1. First use the procedures found in the Visual and Audible Diagnostic Indicators section (page 24).  
2. Use the 24/7 Troubleshooting "Wizard" at http://support.gtoinc.com.  
3. If you are unable to solve the problem, call the GTO Service Department at (800) 543-1236, or (850) 575-4144.  
Refer to the serial number (located on the back of opener arm) and date of purchase when calling for assistance.  
4. If replacement of your gate opener is necessary, the Service Department will assign a Return Goods  
Authorization (RGA) number to you for all warranty repairs.  
5. Securely pack the component(s) authorized for return to the factory. Write the RGA number issued to you on the  
outside of the package in LARGE BOLD PRINT and include a copy of the proof of purchase. Ship the package(s)  
freight prepaid to: GTO, 3121 Hartsfield Road, Tallahassee, Florida, USA 32303.  
NOTE: Products returned to GTO without a Return Goods Authorization (RGA) number in LARGE BOLD  
PRINT on the outside of the package WILL NOT be accepted. Also, items returned to GTO freight collect  
WILL NOT be accepted.  
After the eighteen (18) month warranty expires, GTO, or one of its authorized service  
centers will perform necessary repairs for a nominal fee. Call GTO's Technical Service  
Department.  
GTO Technical Service and Installation Assistance  
8:00am–7:00pm • Monday–Friday (EST)  
Toll Free Support: 800-543-1236 • Local Support 1-850-575-4144 • Fax: 850/575-8950  
Gates That Open, LLC  
3121 Hartsfield Road, Tallahassee, Florida, USA 32303  
rev 082211  
Mighty Mule FM402 Installation Instructions 25  
Accessories  
detailed descriptions of Mighty Mule Accessories.  
Or call 1-850-575-0176.  
ACCESS CONTROLS  
Solar Panel (FM123) 10 watt  
If your gate is more than 1000' from an AC power source, you can choose to maintain the  
battery charge with the Solar Panel Charging Kit. Installation in some regions of the world will  
require multiple solar panels for adequate charging power.  
Pin Lock (FM133)  
The Pin Lock substitutes for the clevis pin at the front end of the Mighty Mule gate openers.  
Helps prevent theft of the opener from the gate.  
Single Button Transmitter (FM135)  
The Mighty Mule entry transmitter, with adjustable settings, is standard equipment with all Mighty  
Mule systems. Purchase one for every vehicle in your family.  
Digital Keypad (FM137)  
1
2
3
ABC  
DEF  
4
5
6
GHI  
JKL  
MNO  
Allow friends and delivery personnel to pen the gate using a personal identification code that  
you provide. Easily program up to 25 different personal identification number (PIN) codes. The  
digital keypad can be wireless or wired to your opener.  
7
8
9
PRS  
TUV  
WXY  
0
Keypad Mounting Post (FM100)  
This black powder coated pedestal is designed to provide convenient access to your keypad,  
wireless intercom, or other access control device from your vehicle. Surface Mount Flanges  
(F102) and Extensions (F103) for added height are available.  
Gate Opening Sensor (FM138)  
The Sensor is an electromagnetic sensor, which offers "hands free" operation of the Mighty  
MuleGate Openor with a 12 ft. radius of detection of vehicles in motion. A wireless version of the  
Gate Opening Sensor is available. (FM130)  
Automatic Gate Lock (FM143)  
A MUST for added security. Solenoid driven, with a steel housing. Unlocks and locks  
automatically as gates open and close. Comes with a keyed manual release. Recommended for  
gates over 8 ft. long.  
C
I
T
K
C
A
O
®
M
O
T
U
L
A
E
OCK  
T
A
G
ELECTRONIC SECURITY  
L
Wireless Driveway Alarm (FM231)  
This device alerts you of vehicles entering and exiting your property. When a vehicle passes the  
sensor, the receiver emits an audible tone and lets you know someone’s there. Functional range  
of up to 400 ft. Easy-to-install.  
Low Voltage Wire (RB509)  
The 16 gauge, stranded, dual conductor Low Voltage Wire is for connecting the AC powered  
transformer, or the Solar Panel to the control board. Also used for the connection of accessories,  
such as locks, keypads, push buttons and other wired control devices. This specially designed  
wire is UV treated, PVC coated and ready for direct burial.  
Push to Open Bracket (FM148)  
Required when Mighty Mule gate opener must push the gate open, such as on a sloping  
driveway or where space prevents gate(s) from opening inward (pulled open). Order two  
brackets for conversion of a dual swing gate installation.  
26 Mighty Mule FM402 Installation Instructions  
rev 082211  

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