Gravely Lawn Mower 915170 ZT42 CARB User Guide

ZT™  
Owner/Operator Manual  
Manuel du Propriétaire/Utilisateur  
Models  
915146 – ZT 34  
(SN 030000 +)  
915148 – ZT 42  
(SN 030000 +)  
915150 – ZT 50  
(SN 030000 +)  
915168 – ZT 34 CARB  
(SN 030000 +)  
915170 – ZT 42 CARB  
(SN 030000 +)  
915178 – ZT 42  
(SN 030000 +)  
915180 – ZT 50  
(SN 030000 +)  
The use of any gasoline exceeding 10% ethanol (E10) or  
10% MTBE will void the product warranty.  
L’utilisation d’une essence contenant plus de 10%  
d’éthanol (E10) ou de 10% de MTBE annulent la garantie.  
E10  
ENGLISH  
FRANÇAIS  
04699200B 4/14  
Printed in USA  
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Before Attempting to Operate Your  
Unit:  
1. Make sure all assembly has been  
properly completed.  
PRODUCT REGISTRATION  
The Gravely dealer must register the product  
at the time of purchase. Registering the  
product will help the company process  
warranty claims or contact you with the latest  
service information. All claims meeting  
requirements during the limited warranty  
period will be honored, whether or not the  
product registration card is returned. Keep a  
proof of purchase if you do not register your  
unit.  
2. Understand all Safety Precautions  
provided in the manuals.  
3. Review control functions and operation  
of the unit. Do not operate the unit  
unless all controls function as described  
in this manual.  
4. Review recommended lubrication,  
maintenance and adjustments.  
Customer Note: If the dealer does not  
register your product, please fill out, sign and  
return the product registration card to  
Internet.  
5. Review Limited Warranty Policy.  
6. Fill out a product registration card and  
return the card to the Ariens Company or  
UNAUTHORIZED REPLACEMENT  
PARTS  
DISCLAIMER  
Gravely reserves the right to discontinue,  
change, and improve its products at any time  
without notice or obligation to the purchaser.  
Use only Gravely replacement parts. The  
replacement of any part on this unit with  
anything other than a Gravely authorized  
replacement part may adversely affect the  
performance, durability, and safety of this unit  
and may void the warranty. Gravely disclaims  
liability for any claims or damages, whether  
warranty, property damage, personal injury or  
death arising out of the use of unauthorized  
replacement parts.  
The descriptions and specifications contained  
in this manual were in effect at printing.  
Equipment described within this manual may  
be optional. Some illustrations may not be  
applicable to your unit.  
NOTE: A complete Parts manual may be  
Internet.  
DELIVERY  
Customer Note: If you have purchased this  
product without complete assembly and  
instruction by your retailer, it is your  
responsibility to:  
Read and understand all assembly  
instructions in this manual. If you do  
not understand or have difficulty  
following the instructions, contact your  
nearest Gravely dealer for assistance.  
NOTE: To locate your nearest Gravely dealer,  
WARNING: Improper assembly  
or adjustments can cause serious  
injury.  
EN - 3  
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SAFETY  
WARNING: This cutting machine  
CAUTION: POTENTIALLY  
HAZARDOUS SITUATION! If not  
avoided, MAY RESULT in minor  
or moderate injury. It may also be  
used to alert against unsafe  
practices.  
is capable of amputating hands  
and feet and throwing objects.  
Failure to observe the safety  
instructions in the manuals and on  
decals could result in serious  
injury or death.  
Slopes are a major factor related  
to loss-of-control and tip-over  
accidents. Operation on all slopes  
requires extra caution.  
NOTATIONS  
NOTE: General reference information for  
proper operation and maintenance practices.  
IMPORTANT: Specific procedures or  
information required to prevent damage to  
unit or attachment.  
Tragic accidents can occur if the  
operator is not alert to the  
presence of children. Never  
assume that children will remain  
where you last saw them.  
SAFETY DECALS AND  
LOCATIONS  
ALWAYS replace missing or damaged Safety  
Decals. Refer to Figure 2 for safety decal  
locations.  
Gasoline is extremely flammable  
and the vapors are explosive,  
handle with care.  
Disengage attachment, stop unit  
and engine, remove key, engage  
parking brake, and allow moving  
parts to stop before leaving  
operator’s position.  
SAFETY ALERTS  
Look for these symbols to  
point out important safety  
precautions. They mean:  
Attention!  
Personal Safety Is  
Involved!  
Become Alert!  
Obey The Message!  
The safety alert symbol is used in decals and  
with this manual. Understand the safety  
message. It contains important information  
about personal safety.  
WARNING: POTENTIALLY  
HAZARDOUS SITUATION! If not  
avoided, COULD RESULT in  
death or serious injury.  
DANGER: IMMINENTLY  
HAZARDOUS SITUATION! If not  
avoided, WILL RESULT in death  
or serious injury.  
EN - 4  
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7
4
07800401  
6
2
5
KEEP HANDS and FEET AWAY  
3
1
2
07800403  
Figure 2  
1. DANGER!  
2. DANGER!  
Discharge Hazard -  
NEVER operate unit  
without discharge chute  
in operating position.  
Thrown objects can  
cause injury or damage.  
Discharge Hazard -  
NEVER direct discharge  
toward people, pets or  
property. Thrown objects  
can cause injury or  
damage.  
Do not operate mower  
unless all guards are in  
operating position or  
bagger is attached.  
Dismemberment Hazard -  
NEVER stick hands or feet  
under deck or shielded  
areas.  
Shut off engine, remove  
key, and read manual  
before servicing or making  
adjustments to unit.  
EN - 5  
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Keep children and others  
away from unit while unit is  
in operation.  
Keep all guards and  
shields in place.  
3.2 Discharge Hazard  
Keep feet and hands away  
from all rotating or moving  
parts.  
Discharge Hazard -  
NEVER direct discharge  
toward people, pets or  
property. Thrown objects  
can cause injury or  
damage.  
DO NOT step or stand in  
this area.  
Keep children and others  
away from unit while unit is  
in operation.  
3. DANGER!  
Do not operate mower  
unless all guards are in  
operating position or  
bagger is attached.  
DANGER!  
3.3 Tipping Hazard  
Read and understand the  
operator’s manual before  
operating unit.  
Avoid tipping hazard.  
3.1 Dismemberment Hazard  
15  
15  
DO NOT operate on slopes  
over 15°.  
To avoid dismemberment  
hazard do not put hands  
near rotating blades.  
DO NOT operate on slopes  
over 15°.  
To avoid dismemberment  
hazard do not put hands  
near moving belts.  
3.4 Service Hazard  
Before servicing unit do the  
following:  
Keep hands away from all  
rotating or moving parts.  
EN - 6  
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Read owners manual  
before servicing or making  
adjustments to unit.  
Proceed off slope slowly.  
Do not try to turn or speed  
up.  
Set parking brake.  
Remove key and  
4. DANGER!  
disconnect spark plug  
before servicing or making  
adjustments to unit.  
To avoid dismemberment  
hazard do not put hands  
near moving belts.  
3.5 Bystander Hazard  
DO NOT operate the unit in  
the presence of  
bystanders.  
Keep hands away from all  
rotating or moving parts.  
Do not carry passengers.  
5. DANGER!  
DANGER!  
Look behind when  
operating the unit in  
reverse.  
ALWAYS Keep hands and  
feet away from discharge  
chute.  
3.6 Loss of Traction Hazard  
If loss of traction is  
experienced do the  
following:  
Dismemberment Hazard -  
NEVER put hands or feet  
beneath guards and or  
shields.  
Disengage PTO.  
EN - 7  
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Only the user can prevent and is responsible  
for accidents or injuries occurring to  
6. DANGER!  
themselves, other people or property.  
Read, understand, and follow all safety  
practices in Owner/Operator Manual before  
assembling, using or working on this mower.  
DO NOT touch parts which  
are hot from operation.  
ALWAYS allow parts to  
cool.  
ALWAYS remove key from ignition and wire  
from spark plug before assembly, or working  
on this unit.  
Inspect unit before each use for: missing or  
damaged decals and shields, correctly  
operating safety interlock system, and  
deterioration of grass catchers. Replace or  
repair as needed.  
7. CAUTION!  
No smoking.  
ALWAYS check overhead and side  
clearances carefully before operation.  
ALWAYS be aware of traffic when crossing or  
operating along streets or curbs.  
Keep children, people, and pets away. Be  
alert and shut off unit if anyone enters work  
area. Keep children under watchful care of a  
responsible adult.  
IMPORTANT: DO NOT  
overfill.  
Fill fuel tank to below  
bottom of filler neck.  
NEVER allow children to operate or play on  
or near unit.  
WARNING: Overfilling may cause  
severe damage to evaporative  
system!  
Keep area of operation clear of all toys, and  
debris. Thrown objects can cause injury.  
Stay alert for hidden hazards, holes, and ruts.  
Never fill fuel tank when engine is  
running, hot or unit is indoors. Never  
overfill fuel tank.  
Avoid uneven or rough terrain. DO NOT  
operate near drop-offs, ditches, or  
embankments. Unit can suddenly turn over if  
a wheel is over the edge of a cliff or ditch, or if  
an edge caves in.  
Replace fuel cap securely and clean  
up spilled fuel.  
Dust, fog, etc. can reduce vision and cause  
an accident. Operate unit only when there is  
good visibility and light.  
EMISSION CONTROL SYSTEM  
This equipment and/or its engine may include  
exhaust and evaporative emissions control  
system components required to meet U.S.  
Environmental Protection Agency (EPA)  
and/or California Air Resources Board  
(CARB) regulations. Tampering with emission  
controls and components by unauthorized  
personnel may result in severe fines or  
penalties. Emission controls and components  
can only be adjusted by an Ariens Company  
dealer or an authorized engine  
Data indicates that operators, age 60 and  
above, are involved in a larger percentage of  
riding mower related injuries. These  
operators should evaluate their ability to  
operate the riding mower safely enough to  
protect themselves and others from serious  
injury.  
Only trained adults may operate unit. Training  
includes being familiar with controls and  
actual operation.  
manufacturer's service center. Contact your  
Ariens Company Equipment Retailer  
concerning emission controls and component  
questions.  
NEVER operate unit after or during the use of  
medication, drugs or alcohol.  
NEVER allow anyone to operate this unit  
when their alertness or coordination is  
impaired.  
SAFETY RULES  
Wear adequate safety gear, sturdy shoes,  
and protective gloves.  
If unit is to be used by someone other than  
original purchaser; loaned, rented or sold,  
ALWAYS provide this manual and any  
needed safety training before operation.  
DO NOT wear loose clothing or jewelry and  
tie back hair that may get caught in rotating  
parts.  
EN - 8  
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Protect eyes, face and head from objects that  
may be thrown from unit. Wear appropriate  
hearing protection. Always wear safety  
goggles or safety glasses with side shields  
when operating mower.  
ALWAYS keep protective structures, guards  
and panels in good repair, in place and  
securely fastened.  
Do not operate without either entire grass  
catcher or the discharge guard in place.  
Avoid sharp edges. Sharp edges can cut.  
Moving parts can cut off fingers or a hand.  
DO NOT operate in reverse unless absolutely  
necessary. ALWAYS look down and behind  
before and while backing; especially for  
children.  
ALWAYS keep hands and feet away from all  
rotating parts during operation. Rotating parts  
can cut off body parts.  
Follow the manufacturer’s recommendations  
for wheel weights or counterweights to  
improve stability when using attachments.  
ALWAYS keep hands away from all pinch  
points.  
Start and operate unit only when seated in  
operator’s position. Steering control levers  
must be in neutral, PTO disengaged and  
parking brake set when starting engine.  
NEVER carry passengers – especially  
children – even with blades off.  
Use extra care when approaching blind  
corners or objects that may obscure vision of  
hidden obstacles and children.  
ALWAYS keep body and hands away from  
pin holes or nozzles which eject hydraulic  
fluid under pressure.  
If you cannot back up a slope or you feel  
uneasy on it, do not mow it.  
DO NOT touch unit parts which might be hot  
from operation. Allow parts to cool before  
attempting to maintain, adjust or service.  
Operation on slopes may lead to loss of  
steering control. When operating on slopes  
be prepared to react to an emergency  
situation:  
NEVER place your hands or any part of your  
body or clothing inside or near any moving  
part while unit is running.  
Return steering levers to neutral  
position.  
NEVER direct discharge towards persons or  
property. Thrown objects may ricochet back  
towards operator. ALWAYS stand clear of the  
discharge area.  
Immediately set parking brake.  
Turn off PTO and engine.  
Mow up and down slopes, not across them.  
Use slow speed on any slope. Tires may lose  
traction on slopes even though the brakes are  
functioning properly.  
ALWAYS disengage attachment, stop unit  
and engine, place control levers in neutral,  
remove key, engage parking brake, and allow  
moving parts to stop before leaving  
operator’s position.  
Keep all movements on the slope slow and  
gradual. DO NOT make sudden changes in  
speed or direction.  
Use extreme caution on gravel surfaces.  
Use extra care while operating machines with  
grass catcher or other attachments. They can  
affect stability of the machine.  
Disengage PTO when attachment is not in  
use and when crossing gravel surfaces.  
DO NOT operate unit if safety interlock  
system is damaged or disabled. Check safety  
interlock before each use.  
Avoid starting, stopping, or turning on a  
slope. If tires lose traction, disengage the  
blades and proceed slowly straight down the  
slope.  
ALWAYS remove key to prevent unauthorized  
use.  
DO NOT operate on slopes over 15°.  
DO NOT operate at too fast a rate. Slow  
down before turning.  
DO NOT park on slopes unless necessary. If  
unit is parked on a slope, ALWAYS chock or  
block wheels and set parking brake.  
Stop engine before removing grass catcher or  
unclogging chute.  
DO NOT disengage or bypass transmission  
and coast downhill.  
DO NOT mow on wet grass. Reduced  
traction could cause sliding.  
Tow only with a machine that has a hitch  
designed for towing. Do not attach towed  
equipment except at the hitch point.  
DO NOT try to stabilize the machine by  
putting your foot on the ground.  
Know the weight of loads. Limit loads to those  
you can safely control and the unit can safely  
handle.  
Follow the manufacturer’s recommendations  
for weight limits for towed equipment and  
towing on slopes.  
Maximum Tongue weight: 30 lbs.  
Maximum Trailer weight: 300 lbs.  
EN - 9  
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Do not use hitch with bagger attached.  
Do not use on steep hills or slopes.  
Keep the nozzle in contact with the rim of the  
fuel tank or container opening at all times until  
fueling is complete. Do not use a nozzle lock-  
open device.  
Do not park on hills when trailer is attached.  
Do not use with any ground engaging  
equipment.  
If fuel is spilled on clothing, change clothing  
immediately.  
NEVER allow children or others in or on  
towed equipment.  
Avoid Electric Shock. Objects contacting both  
battery terminals at the same time may result  
in injury and unit damage. DO NOT reverse  
battery connections.  
On slopes, the weight of the towed equipment  
may cause loss of traction and loss of control.  
Travel slowly and allow extra distance to stop.  
Explosive Gases from battery can cause  
death or serious injury. Poisonous battery  
fluid contains sulfuric acid and its contact with  
skin, eyes or clothing can cause severe  
chemical burns.  
Use extra care when loading or unloading  
unit onto trailer or truck.  
Secure unit chassis to transport vehicle.  
NEVER secure from rods or linkages that  
could be damaged.  
NO flames, NO sparks, NO smoking near  
battery.  
DO NOT transport machine while engine is  
running.  
ALWAYS wear safety glasses and protective  
gear near battery. Use insulated tools.  
ALWAYS turn off power to attachment and  
properly drain fuel when transporting unit.  
DO NOT TIP battery beyond a 45° angle in  
any direction.  
Keep unit free of grass clippings, leaves, and  
other debris. Clean up oil or fuel spills.  
ALWAYS keep batteries out of reach of  
children.  
This product is equipped with an internal  
combustion type engine. DO NOT use unit on  
or near any unimproved, forest-covered or  
brush covered land unless exhaust system is  
equipped with a spark arrester meeting  
applicable local, state or federal laws. A spark  
arrester, if it is used, must be maintained in  
effective working order by operator.  
Battery posts, terminals and related  
accessories contain lead and lead  
compounds, chemicals known to the State of  
California to cause cancer and reproductive  
harm. Wash hands after handling.  
Reverse connections may result in sparks  
which can cause serious injury. Always  
connect positive (+) lead of charger to  
positive (+) terminal, and negative (-) lead to  
negative (-) terminal.  
Fuel is highly flammable and its vapors are  
explosive. Handle with care. Use only an  
approved gasoline container with an  
appropriately sized dispensing spout.  
ALWAYS disconnect negative (-) cable FIRST  
and positive (+) cable SECOND. ALWAYS  
connect positive (+) cable FIRST, and  
negative (-) cable SECOND.  
NO smoking, NO sparks, NO flames.  
ALWAYS allow engine to cool before  
servicing.  
NEVER fill fuel tank when engine is running  
or hot from operation.  
A frozen battery can explode and result in  
death or serious injury. DO NOT charge or  
jump start a battery containing frozen fluid.  
Thaw the battery before putting on a charger  
or jump starting.  
NEVER fill or drain fuel tank indoors.  
NEVER overfill fuel tank.  
Properly remove fuel before tipping unit.  
ALWAYS keep protective structures, guards,  
and panels in good repair, in place and  
securely fastened. NEVER modify or remove  
safety devices.  
Replace fuel cap securely and clean up  
spilled fuel.  
NEVER fill containers inside a vehicle or on a  
truck or trailer bed with a plastic liner. Always  
place containers on the ground away from  
your vehicle before filling.  
DO NOT change engine governor settings or  
over-speed engine.  
Fumes from engine exhaust can cause injury  
or death. DO NOT run engine in an enclosed  
area. Always provide good ventilation.  
When practical, remove gas-powered  
equipment from the truck or trailer and refuel  
it on the ground. If this is not possible, then  
refuel such equipment on a trailer with a  
portable container, rather than from a  
gasoline dispenser nozzle.  
ALWAYS maintain unit in safe operating  
condition. Damaged or worn out muffler can  
cause fire or explosion.  
EN - 10  
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Stop and inspect equipment if you strike an  
object or if there is an unusual vibration.  
Repair, if necessary, before restarting. Never  
make adjustments or repairs with the engine  
running.  
Never store the machine or fuel container  
inside a building where there is an open  
flame, such as a water heater.  
Shut off fuel (if provided) and allow engine to  
cool completely before storing in closed area  
or covering unit.  
Mower blades are sharp and can cut you.  
Wrap the blade(s) or wear gloves, and use  
extra caution when servicing them. NEVER  
weld or straighten mower blades.  
Clean grass and debris from unit, especially  
from around muffler and engine, to help  
prevent fires.  
Rotation of one blade may cause rotation of  
the other blades.  
For extended storage, clean unit thoroughly.  
See storage section and Engine Manual for  
proper storage.  
Check brake operation frequently. Adjust and  
service as required.  
Use only attachments or accessories  
designed for your unit.  
Keep all hardware properly tightened.  
Stored energy in springs can cause injury.  
Check attachment components frequently. If  
worn or damaged, replace with  
manufacturer’s recommended parts.  
Maintain or replace safety and instruction  
labels, as necessary.  
ASSEMBLY  
NOTE: Do not tighten hardware before  
reviewing See “ADJUSTING STEERING  
LEVERS” on page 28. If no adjustment is  
desired tighten hardware.  
WARNING: AVOID INJURY.  
Read and understand the entire  
Safety section before proceeding.  
Tools Required  
Adjustable wrench  
Petroleum jelly or dielectric grease  
Unpack Unit  
Remove unit and all other components from  
the shipping container. Engage transmission  
bypass lever. See “MOVING UNIT  
1
MANUALLY” on page 19. Push unit from  
container onto a level surface. Disengage  
transmission bypass lever.  
3
Connect Battery  
See "Install Factory-Installed Battery" on  
page 26 and perform steps 5 and 6 in the  
installation section.  
1. Steering Lever  
2. Steering Pivot Arm  
3. Steering Lever Hardware  
Place Unit in Operating Position  
(Figure 3)  
Figure 3  
NOTE: The seat is shipped with the seat  
positioned as far back as possible.  
Check Engine Oil Level  
Refer to Engine Manual.  
1. Push steering levers aside and tip seat  
up.  
2. Adjust the seat as needed. See “Seat  
Adjustment” on page 16.  
3. Remove hardware from top hole of the  
steering lever (Figure 3). Slide steering  
lever back to align slot with hole at the  
top of the steering pivot arm.  
EN - 11  
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Check Tire Pressure  
CAUTION: Avoid injury!  
Explosive separation of tire and  
rim parts is possible when they  
are serviced incorrectly:  
Do not attempt to mount a  
tire without the proper  
equipment and experience  
to perform the job.  
Do not inflate the tires  
above the recommended  
pressure.  
Do not weld or heat a  
wheel and tire assembly.  
Heat can cause an  
increase in air pressure  
resulting in an explosion.  
Welding can structurally  
weaken or deform the  
wheel.  
Do not stand in front or  
over the tire assembly  
when inflating. Use a clip-  
on chuck and extension  
hose long enough to allow  
you to stand to one side.  
See "SPECIFICATIONS" on page 34.  
Level Mower Deck  
See “LEVELING AND ADJUSTING PITCH  
OF MOWER DECK” on page 23.  
Fill Fuel Tank  
Fill fuel tank. DO NOT OVERFILL! See  
"FILLING FUEL TANK" on page 17.  
Check Safety Interlock System  
WARNING: Safety interlock  
failure and improper operation of  
unit can result in death or serious  
injury. Check system before each  
use to make sure it is functioning  
properly.  
See "Safety Interlock System" on page 14.  
Check function of all controls  
See "OPERATION" on page 14.  
EN - 12  
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CONTROLS AND FEATURES  
3
5
6
12  
1
4
7
14  
10  
9
915148, 150, 170, 178, 180  
13  
8
2
915146, 168  
11  
1
2
1
11  
Figure 4  
1. Ignition Switch  
2. PTO Switch  
3. Seat  
11. Throttle/Choke Lever  
12. Seat Adjustment Lever  
(915148, 150, 170, 178, 180)  
13. Height of Cut Selector Lever  
4. Fuel Level  
5. Steering Levers  
6. Fuel Tank  
14. Washout Port  
(915148, 150, 170, 178, 180)  
7. Mower Lift Pedal  
8. Mower Deck  
9. Discharge Chute  
10. Parking Brake Lever  
EN - 13  
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OPERATION  
Safety Interlock System  
WARNING: AVOID INJURY.  
Read and understand the entire  
Safety section before proceeding.  
WARNING: Safety interlock failure  
and improper operation of unit can  
result in death or serious injury.  
Check system before each use to  
make sure it is functioning  
properly.  
CONTROLS AND FEATURES  
See Figure 4 for all controls and features  
locations.  
Perform the following tests to ensure the  
safety interlock system is working properly. If  
the unit does not perform as stated contact  
your Gravely dealer for repairs.  
Test  
1
Steering Lever  
Neutral Position  
Neutral Position  
Neutral Position  
Out of Neutral Position  
Neutral Position  
PTO  
Off  
On  
Off  
Off  
On  
Parking Brake  
Engaged  
Engine  
Starts  
2
Engaged  
Doesn’t Start  
Doesn’t Start  
Shuts Off  
Shuts Off  
3
Disengaged  
Disengaged  
Engaged  
4*+  
5*+  
* Test with engine running.  
+ Operator lifts off seat.  
Ignition Switch  
Throttle/Choke Lever  
(915148, 150, 170, 178, 180)  
Operate ignition switch  
with a removable key.  
Ignition switch has three  
positions: Stop (1),  
Run (2), Start (3). See  
"STARTING AND  
Choke (1) – Use to start a cold  
engine. Pull lever up for choke.  
Push lever down once unit is  
started.  
2
1
3
SHUTTING OFF  
Fast (2) – Increases engine  
speed.  
ENGINE" on page 18 for  
detailed instructions on  
how to start engine.  
Slow (3) – Decreases engine  
speed.  
EN - 14  
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Throttle/Choke Lever  
(915146, 168)  
2
4
1
Choke (1) – Use to start a  
cold engine. Push throttle  
lever past detent for choke to  
start a cold engine. Pull  
throttle lever back past detent  
to close choke for a warm  
engine.  
1
2
3
Fast (2) – Increases engine  
speed.  
NOTE: To stop, return both steering levers to  
neutral.  
Slow (3) – Decreases engine  
speed.  
NOTE: The steering levers must be in the  
neutral position to start the engine.  
3
NOTE: The parking brake must be  
disengaged prior to moving the steering  
levers from the neutral position.  
Parking Brake Lever  
Engages (2) and  
disengages (1) parking  
brake.  
Height of Cut  
(Figure 5)  
1
2
1. Press the mower lift pedal to raise the  
deck.  
2. Position height of cut selector lever at  
the desired setting in the height of cut  
bracket.  
3. Release mower lift pedal.  
Power Take-Off (PTO) Switch  
Engages (2)  
and  
2
3
1
1
disengages  
(1) mower  
blades.  
2
Steering Levers  
Reverse (1) – Pull both steering levers  
backward.  
Forward (2) – Push both steering  
levers forward.  
1. Mower Lift Pedal  
2. Height of Cut Selector Lever  
3. Height of Cut Bracket  
Left (3) – Pull left steering lever back  
or push right steering lever forward or  
a combination of both.  
Figure 5  
Right (4) – Pull right steering lever  
back or push left steering lever  
forward or a combination of both.  
EN - 15  
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NOTE: Wash the underside of the mower  
after each use to prevent grass buildup and  
improve mulch action and clipping dispersal.  
Seat Adjustment  
(915148, 150, 170, 178, 180)  
(Figure 6)  
Push lever back and slide seat forward or  
backward to the desired position. Release  
lever to lock seat in position.  
1
3
4
2
5
1. Deck Port  
2. Hose Coupling  
3. Lock Collar  
4. Mower Deck  
Figure 6  
5. Standard Garden Hose  
Seat Adjustment  
(915146, 168)  
Figure 7  
1. Tip the seat forward. See “TIPPING  
SEAT FORWARD” on page 22.  
1. Park the unit on a level surface, within  
reach of hose and in a location where  
the dispersal of wet grass clippings is  
acceptable.  
2. Loosen mounting hardware and slide  
seat forward or backward to desired  
position. Tighten mounting hardware  
(figure 9).  
2. Disengage the PTO switch, shut off the  
engine, remove key, engage parking  
brake and allow unit to cool for at least  
30 minutes.  
3. Tip seat back.  
Towing/Trailer Hitch  
(915148, 150, 170, 178, 180)  
IMPORTANT: Do not wash the unit with water  
when the unit is warm from operation. Water  
can seep into bearings and cause damage.  
IMPORTANT: Tow only equipment rated for  
the correct tow and tongue weight.  
3. Attach the hose coupling to a standard  
garden hose connected to a water  
supply.  
Units equipped with trailer hitch are rated for  
30 lbs tongue weight and should not pull  
more than 300 lbs.  
4. Pull back the lock collar of the hose  
coupling and push the coupling onto the  
deck port until the coupling it tightly in  
place. Release the lock collar to lock the  
coupling to the deck port.  
Washout Port  
(915148, 150, 170, 178, 180)  
(Figure 7)  
NOTE: Apply petroleum jelly to washout  
fitting O-ring to allow the coupling to slide on  
easier and to protect the O-ring.  
WARNING: A broken or missing  
deck port can result in exposure to  
harmful thrown objects or blade  
contact.  
NOTE: The coupling contains a valve that will  
not allow water flow unless coupling is  
attached to washout fitting. Water supply  
should be turned off before attaching coupling  
to the fitting.  
Replace broken or missing deck  
port before using unit.  
NEVER put your hands or feet  
under the mower or through  
openings in the mower.  
5. Lower deck to lowest cutting height.  
6. Turn the water supply on high.  
EN - 16  
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NOTE: If water leaks excessively from hose  
coupling onto top of deck, coupling may not  
be fully seated onto washout port. Turn off  
water supply and repeat steps 4 through 6.  
Use firm pressure while installing coupling  
onto washout port.  
IMPORTANT: DO NOT OVERFILL! This  
equipment and/or its engine may include  
evaporative emissions control system  
components, required to meet EPA and/or  
CARB regulations, that will only function  
properly when the fuel tank has been filled to  
the recommended level. Overfilling may  
cause permanent damage to evaporative  
emissions control system components. Filling  
to the recommended level ensures a vapor  
gap required to allow for fuel expansion. Pay  
close attention while filling the fuel tank to  
ensure that the recommended fuel level  
inside the tank is not exceeded. Use a  
portable gasoline container with an  
WARNING: When using the deck  
wash system, NEVER engage the  
deck from any position other than  
the operator’s seat.  
DO NOT engage deck in the  
presence of ANY bystander.  
7. From the operators seat, start the  
engine and engage the PTO. Allow unit  
to run as needed - typically 2 to 3  
minutes.  
appropriately sized dispensing spout when  
filling the tank. Do not use a funnel or other  
device that obstructs the view of the tank  
filling process.  
NOTE: Water spraying from discharge chute  
should change from green to clear when deck  
is clean.  
4. Replace fuel cap and tighten.  
5. ALWAYS clean up spilled fuel.  
GASOLINE  
IMPORTANT: ALWAYS use gasoline that  
meets the following guidelines:  
8. Disengage the PTO, turn off engine,  
remove key and wait for all moving parts  
to stop.  
9. Turn the water supply off and remove  
coupling from the washout fitting.  
Clean, fresh gasoline.  
A minimum of 87 octane/87 AKI  
(91 RON). High altitude use may  
require a different octane. Consult  
your engine manual.  
NOTE: If the mower deck is not clean after  
one washing, soak it and let stand for 30  
minutes. Then repeat process.  
10. After cleaning the mower deck, run the  
unit again for 2 to 3 minutes to remove  
access water.  
Gasoline with up to 10% ethanol  
(gasohol) or up to 10% MTBE (methyl  
tertiary butyl ether) is acceptable.  
Fuel Level  
Use of any gasoline other than those  
approved above will void the engine  
warranty. If the pumps are not marked  
for the content of alcohol or ethers,  
check ethanol and MTBE levels with  
the fuel supplier.  
Slot in seat plate shows the fuel  
level in the tank. Refill when  
level reaches bottom of slot.  
Do not modify the fuel system to use  
different fuels.  
Never mix oil and gasoline.  
NOTE: All gasoline is not the same. If the  
engine experiences starting or performance  
problems after using a new gasoline, switch  
FILLING FUEL TANK  
IMPORTANT: DO NOT OVERFILL!  
To add fuel to the fuel tank:  
1. Clean fuel caps and surrounding area to  
prevent dust, dirt, and debris from  
entering fuel tanks.  
IMPORTANT: Excessively oxygenated or  
reformulated fuels (fuels blended with  
alcohols or ethers) can damage the fuel  
system or cause performance problems. If  
any undesirable operating problems occur,  
use a gasoline with a lower percentage of  
alcohol or ether.  
2. Remove fuel caps.  
IMPORTANT: Refer to Engine Manual for  
correct type and grade of fuel.  
3. Fill fuel tank to the bottom of filler neck.  
See "SPECIFICATIONS" on page 34 for  
fuel tank capacity.  
EN - 17  
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5. Wait until the engine is running smoothly  
before operation.  
Fuel Stabilizer  
Gasoline left in the fuel system for extended  
periods without a stabilizer will deteriorate,  
resulting in gum deposits in the system.  
These deposits can damage the carburetor  
and the fuel hoses, filter and tank. Prevent  
deposits from forming in the fuel system  
during storage by adding a quality fuel  
stabilizer to the fuel. Follow the  
IMPORTANT: Allow the engine to warm up  
several seconds to several minutes  
depending on ambient temperature.  
Stopping the Engine  
1. Stop unit.  
2. Disengage PTO.  
3. Set throttle lever to slow.  
recommended mix ratio found on the fuel  
stabilizer container.  
4. Turn ignition switch to off position and  
remove key.  
STOPPING IN AN EMERGENCY  
5. Set parking brake.  
WARNING: Operating unit on  
slopes may lead to loss of  
steering control. When operating  
on slopes be prepared to react to  
an emergency situation.  
OPERATING MOWER  
1. Start engine.  
2. Set throttle lever to fast.  
IMPORTANT: Never engage PTO if mower is  
plugged with grass or other material.  
3. Engage PTO to start mower blades. It  
will take 2 – 3 seconds for the blades to  
engage.  
1. Return steering levers to neutral position.  
2. Immediately set parking brake.  
3. Turn off PTO and engine.  
NOTE: The parking brake must be  
disengaged prior to moving the steering  
levers from the neutral lockout position.  
NOTE: This unit is equipped with the return to  
neutral function. The control arms will  
automatically return gradually to neutral when  
released from the forward position.  
4. Release parking brake.  
5. Use steering levers to move the unit.  
6. Disengage PTO to stop mower blades.  
STARTING AND SHUTTING OFF  
ENGINE  
TRANSPORTING UNIT  
Starting the Engine  
ALWAYS shut off engine, set parking brake,  
remove key, and properly remove fuel when  
transporting unit on a truck or trailer. Tie unit  
down securely. Do not tie down by linkages,  
guards, cables or other parts that may be  
damaged.  
NOTE: Disengage the PTO, place the  
steering levers in neutral, and engage the  
parking brake prior to starting the engine.  
1. If the engine is cold apply choke. If the  
engine is warm or hot, do not use choke.  
See “Throttle/Choke Lever” on page 14.  
FOR BEST PERFORMANCE  
Cut grass when it is dry.  
2. Put the ignition key in the switch and  
turn it to the Start position.  
IMPORTANT: DO NOT operate starter for  
more than 10 seconds per minute as damage  
can occur.  
Keep mower blades sharp.  
Keep mower deck properly leveled.  
Do not set height of cut too low. For very tall  
grass, mow twice.  
3. As soon as the engine starts, release the  
key.  
Do not travel too fast.  
NOTE: Do not turn off the choke immediately  
after engine starts. If the engine is cold or the  
ambient temperature is low the engine may  
stall.  
Mow with the engine set at full throttle.  
When mulching, only remove one-third of  
grass length per cutting.  
Discharge clippings into areas already cut.  
Vary cutting pattern with each mowing.  
4. After starting the engine, gradually set  
choke to off position. See  
“Throttle/Choke Lever” on page 14.  
Do not allow grass or debris to collect inside  
of mower deck. Clean after each use.  
IMPORTANT: Be sure choke control is fully  
disengaged. Engine will not run smoothly and  
will smell like fuel if operating unit with partial  
choke.  
EN - 18  
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MOVING UNIT MANUALLY  
(Figure 8)  
WARNING: DO NOT disengage  
or bypass transmission and coast  
downhill.  
Pull the bypass lever out and lock it in place,  
and then release the parking brake to push  
the unit by hand.  
Push the bypass lever in to drive the unit  
normally.  
NOTE: There are two bypass levers; one on  
each side of the unit.  
1
2
1. Bypass lever pulled out to push the unit  
by hand.  
2. Bypass lever pushed in to drive the  
unit.  
Figure 8  
EN - 19  
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MAINTENANCE SCHEDULE  
NOTE: To have full access to the engine, the  
WARNING: AVOID INJURY. Read  
and understand the entire Safety  
section before proceeding.  
seat must be tipped forward "TIPPING SEAT  
FORWARD" on page 22 and the hood  
opened "MOWER DECK REMOVAL AND  
INSTALLATION" on page 22.  
IMPORTANT: Proper maintenance can  
prolong the life of unit. The following chart  
shows the recommended service schedule.  
Refer to the maintenance instructions in the  
Engine Manual for additional information.  
Interval Task  
Action  
Each Use Check  
Safety  
WARNING: Safety interlock system failure and improper  
operation of unit can result in death or serious injury. Test  
this system each time the unit is operated. If this system  
does not function as described, do not operate until repairs  
Interlock  
System  
are made. "Safety Interlock System" on page 14  
Check  
Parking  
Brake  
Engage parking brake and engage transmission bypass lever. See  
“MOVING UNIT MANUALLY” on page 19. Push unit. If unit rolls,  
contact your Gravely dealer.  
Clean  
Unit  
Clean engine, battery, seat, etc. of all dirt and debris. Do not use  
solvents, hard cleaners, or abrasives. For deck cleaning instructions  
see "Washout Port" on page 16.  
NOTE: Protect painted surfaces with automotive type wax.  
IMPORTANT: Do not spray the unit with water, especially when the  
unit is warm from operation.  
Check  
Tires  
See "SPECIFICATIONS" on page 34 for correct tire pressure.  
CAUTION: Avoid injury! Explosive separation of tire and rim  
parts is possible when they are serviced incorrectly:  
Do not attempt to mount a tire without the proper equipment  
and experience to perform the job.  
Do not weld or heat a wheel and tire assembly. Heat can cause  
an increase in air pressure resulting in an explosion. Welding  
can structurally weaken or deform the wheel.  
Do not stand in front or over the tire assembly when inflating.  
Use a clip-on chuck and extension hose long enough to allow  
you to stand to one side.  
Check  
Mower  
Blades  
Check for worn or damaged mower blades. See “SHARPENING  
MOWER BLADE” on page 24.  
EN - 20  
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Interval Task  
Action  
Each Use Follow  
Engine  
Perform scheduled engine maintenance.  
Refer to Engine Manual for detailed  
instructions.  
Manual  
Mainten-  
ance  
Schedule  
NOTE: To drain the oil, remove oil drain  
cap and attach the oil drain hose,  
supplied in the lit pack, to the drain plug.  
Rotate the drain to the left to allow oil to  
drain. Turn the drain to the right to close.  
Oil Drain Plug  
25 Hours Check  
Keep battery and battery terminals clean. See “Cleaning Battery and  
Battery Cables” on page 27.  
or Every  
Season  
Battery  
Lubricate  
Unit  
1. Apply grease to zerk (1) on each front wheel.  
2. Apply grease to quick adjust seat mechanism through slots (2) on  
bottom side of seat plate. Work grease into mechanism by sliding  
seat back and forth repeatedly.  
1
2
50 Hours Check  
Check mower blade mounting hardware and all other fasteners.  
or Every  
Season  
Fasteners Replace fasteners that are missing or damaged. Tighten all nuts and  
bolts to the correct torque values.  
100 Hours Check All Replace worn or deteriorated belts.  
or Every  
Season  
Belts  
Check hydrostatic belt. See "REPLACING HYDROSTATIC  
BELT" on page 30 for hydrostatic belt location.  
Check PTO belt. See "REPLACING PTO BELT" on page 29 for  
PTO belt location.  
EN - 21  
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SERVICE AND ADJUSTMENTS  
MOWER DECK REMOVAL AND  
INSTALLATION  
WARNING: AVOID INJURY.  
Read and understand the entire  
Remove  
Safety section before proceeding.  
(Figure 10)  
1. Remove PTO belt from the engine drive  
pulley. See “REPLACING PTO BELT” on  
page 29.  
TIPPING SEAT FORWARD  
(Figure 9)  
Move steering levers to neutral position and  
rotate handles outward. Tip seat forward.  
2. Disconnect drag link from the front deck  
bracket.  
3. Disconnect front and rear trunnions from  
the lift arms on both sides of the unit by  
removing the 3/8 nuts. Keep hardware  
for reinstallation.  
3
4. Slide mower deck out from under unit.  
Install  
(Figure 10)  
1. Slide mower deck under unit.  
2. Connect drag link to front deck bracket.  
3. Connect front and rear trunnions to the  
lift arms on both sides of the unit using  
3/8 nuts.  
1
2
4. Install PTO belt on the engine drive  
pulley. See “REPLACING PTO BELT” on  
page 29.  
1. Seat Tipped Forward  
2. Mounting Hardware  
3. Steering Levers  
5. Level and adjust pitch of mower deck.  
See “LEVELING AND ADJUSTING  
PITCH OF MOWER DECK” on page 23.  
Figure 9  
7
2
5
7
6
1
6
3
4
1. Rear Trunnion  
2. PTO Belt  
3. Mower Deck  
4. Drag Link  
5. Front Trunnion  
6. Lift Arms  
7. Nuts  
Figure 10  
EN - 22  
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The Forward Pitch Of The Mower  
Blades  
(Figure 12)  
LEVELING AND ADJUSTING  
PITCH OF MOWER DECK  
NOTE: Adjust on a level surface, with the  
tires inflated to the correct air pressure. See  
“SPECIFICATIONS” on page 34.  
Should be 0" (0 cm) to 1/4" (0.635 cm)  
pitched forward.  
Three measurements are required to level  
and adjust the pitch of the mower deck.  
NOTE: This measurement must be taken  
when the mower blades ends point forward.  
1. The distance from the mower blades to  
the ground.  
Forward Pitch of Mower Blades  
2. The forward pitch of the mower blades.  
1
3
2
3. The pitch of the mower blades from  
side-to-side.  
The Distance From The Mower  
Blades To The Ground  
(Figure 11)  
Forward Pitch = 0" (0 cm)  
to 1/4" (0.635 cm)  
In the lowest cutting position should be  
1-1/2" ± 1/4" (3.175 cm ± .635 cm).  
In the highest cutting position should  
be 4-1/2" ± 1/4" (10.795 cm ±  
.635 cm).  
1. Mower Deck  
2. Mower Blade  
3. Ground  
Lowest Cutting Position  
1
2
3
Figure 12  
The Pitch Of The Mower Blades From  
Side To Side  
(Figure 13)  
Should be within 1/4" (0.635 cm) as  
measured on each side of the mower  
deck.  
1-1/2" ± 1/4" (3.175 cm ± 0.635 cm)  
NOTE: This measurement must be taken  
when the mower blade ends point left and  
right.  
Highest Cutting Position  
1
3
2
Side to Side Pitch  
1
2
3
4-1/2" ± 1/4" (10.795 cm ± 0.635 cm)  
1. Mower Deck  
2. Mower Blade  
3. Ground  
Figure 11  
1/4" (0.635 cm) from Side to Side  
1. Mower Deck  
2. Mower Blade  
3. Ground  
Figure 13  
EN - 23  
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Adjusting The Mower Deck To Adjust  
Mower Blade Height And Pitch  
(Figure 14)  
REPLACING MOWER BLADE  
Remove  
(Figure 15)  
NOTE: Adjusting the mower deck will adjust  
the height and pitch of the mower blades.  
CAUTION: Mower blades are  
sharp and can cut you. Wrap the  
blades or wear gloves, and use  
extra caution when servicing  
them.  
1. Adjust the trunnions first and re-take the  
three measurements required to level  
and adjust the pitch of the mower deck.  
These measurements are:  
a. The distance from the mower  
blades to the ground.  
1. Block mower blades to prevent rotation.  
b. The forward pitch of the mower  
blades.  
2. Remove mounting hardware and mower  
blades from spindles.  
c. The pitch of the mower blades  
from side to side.  
Install  
(Figure 15)  
Adjust Trunnions:  
1. Install mower blades on spindles with  
mounting hardware.  
1. Using an adjustable or open ended  
wrench tighten or loosen the lock nut on  
top.  
2. Torque 5/8" nut to 100 to 120 lbf-ft (136  
to 163 N•m).  
NOTE: To avoid over-adjustment note which  
nuts have been adjusted and the amount  
each has been loosened or tightened.  
1
2
2. Using the same tool, tighten the bottom  
hex nut to raise the deck OR loosen the  
bottom hex nut to lower the deck.  
3. Tighten the lock nut on top to secure the  
link in the desired location.  
4. Repeat step 1 as needed until all three  
measurements (a, b, and c) are within  
the tolerances specified.  
3
4
2
3
1. Spindle  
2. Blade  
3. Washer  
4. 5/8" Nut  
Figure 15  
4
1
SHARPENING MOWER BLADE  
CAUTION: DO NOT sharpen  
mower blade while on unit. An  
unbalanced mower blade will  
cause excessive vibration and  
eventual damage to unit. Check  
mower blade balance prior to  
reinstalling mower blades.  
NEVER weld or straighten mower  
blades.  
1. Trunnion  
2. Mower Deck  
3. Lock Nut  
4. Hex Nut  
Figure 14  
EN - 24  
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1. Remove mower blade from unit. See  
“REPLACING MOWER BLADE” on  
page 24.  
SERVICING THE BATTERY  
NOTE: Unit comes equipped with a  
maintenance-free battery that requires no  
regular maintenance except cleaning the  
terminals.  
Gravely recommends having mower blades  
sharpened by a professional. Contact your  
Gravely dealer.  
Discard mower blade if (Figure 16):  
WARNING: Battery posts,  
more than 1/2" (1.27 cm of metal is  
removed.  
terminals and related accessories  
contain lead and lead  
compounds, chemicals known to  
the State of California to cause  
cancer and reproductive harm.  
Wash hands after handling.  
the air lift erosion area is eroded.  
the mower blade is bent or broken.  
Do not change angle of cutting edge or round  
the corner at the end of mower blade.  
2. Sharpen mower blade by removing an  
equal amount of material from each end  
of mower blade.  
mower blade on an unthreaded bolt. If  
blade is balanced, it should remain in a  
horizontal position. If either end of  
mower blade moves downward, sharpen  
the heavy end until mower blade is  
balanced.  
Remove Factory-Installed Battery  
(Figure 17)  
1. Lower deck to the lowest cutting height.  
2. Tip seat forward. See “TIPPING SEAT  
FORWARD” on page 22.  
3. Disconnect negative (–) cable first, then  
positive (+) cable.  
4. Install mower blade on unit. See  
“REPLACING MOWER BLADE” on  
page 24.  
NOTE: Do not cut cable tie securing positive  
cable to battery hold-down bracket unless  
installing U1 battery.  
DO NOT Sharpen to this Pattern  
2
3
5
Sharpen to this Pattern  
Discard if  
more than  
1/2"  
1
8
6
4
7
2
(1.27 cm)  
1. Positive (+) Terminal  
2. Positive (+) Cable  
1
3. Battery Hold-Down Bracket  
4. Battery  
5. Negative (–) Terminal  
6. Negative (–) Cable  
7. Nut  
1. Air Lift Erosion  
2. Cutting Edge  
Figure 16  
8. Bolt  
Figure 17  
EN - 25  
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4. Remove nut and bolt securing battery  
hold down bracket. Save for  
reinstallation.  
U1 Battery Installation  
1. Remove factory battery. See “Remove  
Factory-Installed Battery” on page 25.  
NOTE: The bolt securing the battery is  
mounted through the underside of the frame.  
Place hand beneath frame to catch loose  
bolt.  
NOTE: Be sure to cut cable tie connecting  
positive battery cable to battery hold down  
bracket.  
5. Remove battery from unit.  
2. Set battery inside the frame, underneath  
the seat with terminals positioned as  
Install Factory-Installed Battery  
(Figure 17)  
3. Place battery hold down bracket on top  
of the battery. Attach the curved end of  
the bracket in the upper mounting hole  
in the wall of the frame (Figure 18).  
1. Tip seat forward. See “TIPPING SEAT  
FORWARD” on page 22.  
2. Set battery inside the frame, underneath  
the seat with battery terminals  
positioned as shown (Figure 17).  
4. Position bolt through the mounting hole  
nearest to the battery and through  
mounting bracket. Secure with nut.  
3. Place battery hold down bracket on top  
of the battery. Hook the curved end of  
the bracket in the lower mounting hole in  
the wall of the frame (Figure 18).  
IMPORTANT: Tighten nut until battery is  
secure and will not move or rattle in the  
frame.  
4. Position bolt through the mounting hole  
nearest to the battery and through  
mounting bracket. Secure with nut.  
3
5
2
1
IMPORTANT: Tighten nut until battery is  
secure and will not move or rattle during  
operation. DO NOT overtighten.  
2
1
4
8
7
6
1. Positive (+) Terminal  
2. Positive (+) Cable  
3. Battery Hold-Down Bracket  
4. Battery  
5. Negative (–) Terminal  
6. Negative (–) Cable  
7. Nut  
1
2
Figure 19  
1. Factory Battery Mounting Hole  
2. U1 Battery Mounting Hole  
Figure 18  
5. Connect positive (+) cable first, then  
negative (–) cable.  
5. Connect positive (+) cable first, then  
negative (–) cable.  
6. Apply petroleum jelly or dielectric grease  
to battery cable ends and terminals.  
6. Apply petroleum jelly or dielectric grease  
to battery cable ends and terminals.  
7. Tip seat back. See “TIPPING SEAT  
FORWARD” on page 22.  
7. Tip seat back. See “TIPPING SEAT  
FORWARD” on page 22.  
EN - 26  
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4. Charge battery according to battery  
charger and battery manufacturers’  
instructions.  
Cleaning Battery and Battery Cables  
(Figure 17)  
1. Tip seat forward. See “TIPPING SEAT  
FORWARD” on page 22.  
5. Install battery on unit. See “Factory-  
Installed Battery Removal and  
2. Disconnect negative (–) cable first, then  
positive (+) cable.  
Jump-Starting  
3. Clean battery cable ends, negative (–)  
terminal, and positive (+) terminal with a  
wire brush and rinse with a weak baking  
soda solution.  
Gravely does not recommend jump-starting  
your unit. Jump-starting can damage engine  
and electrical system components. See your  
engine manual for more detailed information.  
4. Connect positive (+) cable first, then  
negative (–) cable.  
CARBON CANISTER FILTER  
(If Equipped) (Figure 20)  
5. Apply petroleum jelly or dielectric grease  
to battery cable ends and terminals.  
6. Tip seat back. See “TIPPING SEAT  
FORWARD” on page 22.  
2
Charging the Battery  
(Figure 17)  
WARNING: FROZEN  
BATTERIES CAN EXPLODE and  
result in death or serious injury.  
DO NOT charge a frozen battery.  
Let the battery thaw before  
charging.  
1
1. Carbon Canister  
2. Carbon Canister Filter  
Follow First Aid directions for contact with  
battery fluid.  
External Contact: Flush with water.  
Figure 20  
Eyes: Flush with water for at least 15  
minutes and get medical attention  
immediately!  
1. Check the carbon canister filter for  
debris accumulation every time the unit  
is filled with fuel. Remove any buildup.  
Internal Contact: Drink large quantities  
of water. Follow with Milk of Magnesia,  
beaten egg or vegetable oil. Get  
medical attention immediately!  
2. Clean or replace the carbon canister  
filter whenever the engine air filter is  
cleaned or replaced.  
In case of internal contact, DO NOT  
induce vomiting!  
IMPORTANT: DO NOT fast charge. Charging  
at a higher rate will damage or destroy  
battery.  
IMPORTANT: ALWAYS follow information  
provided on battery and battery charger.  
Contact battery and battery charger  
manufacturers’ for detailed instructions.  
1. Remove battery from unit. See “Factory-  
Installed Battery Removal and  
Installation” on page 25.  
2. Place battery in a well-ventilated area.  
3. Connect positive (+) lead of charger to  
positive (+) terminal, and negative (–)  
lead of charger to negative (–) terminal.  
EN - 27  
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ADJUSTING STEERING LEVERS  
(Figure 21)  
Rotate this end away from the operator  
position to move the steering levers in.  
Adjustment 3  
1
Adjustment 1  
3
Rotate this end away from the operator  
position to move the steering levers out.  
Figure 22  
2
3. Adjust Steering Lever Forward or  
Backward  
1. Loosen, do not remove, the bolts  
securing the handlebar to the upper  
control arm.  
6
Adjustment 2  
2. Rotate steering lever forward or  
backward to desired position and tighten  
bolts.  
5
4
1. Handlebar  
2. Upper Control Arm  
3. Adjustment Holes  
4. Eccentric Spacer  
5. Mounting Hardware  
6. Lower Control Arm  
NOTE: Tighten upper bolt first.  
Forward Speed Adjustment  
(Figure 23)  
NOTE: Reverse speed cannot be adjusted. If  
unit tracks excessively left or right in reverse,  
see your dealer for repair.  
Figure 21  
IMPORTANT: Adjust each steering lever  
equally.  
IMPORTANT: The unit should track within  
2 feet (0.61 m) of a straight line for 30 feet  
(9.14 m).  
NOTE: When adjusting steering levers for the  
first time it is recommended that you make  
adjustments in the following order.  
The travel of the steering levers may need  
adjustment if the unit turns to the right or left  
when both steering levers are pushed as far  
forward as possible.  
1. Adjust Steering Lever Height  
1. Remove mounting hardware that  
attaches the handlebars to the upper  
control arm. Move handlebar up or down  
until the handlebar mounting holes are  
aligned with the prefered adjustment  
holes.  
NOTE: The side the unit turns toward  
indicates that the drive wheel on that side is  
turning slower than the opposite drive wheel.  
Either the wheel that is turning faster needs  
to slow down or the wheel that is turning  
slower needs to speed up to allow the unit to  
travel in a straight line.  
2. Install mounting hardware and tighten.  
2. Adjust Steering Lever Width  
1. Loosen hardware at the base of the  
lower control arm item 5.  
1. Determine which way the unit turns.  
2. Loosen jam nut on the adjustment bolt.  
3. Adjust speed by:  
2. Rotate eccentric spacer to move the  
levers away from or closer to the  
operators position (figure 22).  
Turning adjustment bolt clockwise to  
decrease steering lever travel.  
Turning adjustment bolt  
counterclockwise to increase steering  
lever travel.  
3. Tighten hardware.  
4. Tighten the jam nut.  
EN - 28  
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915146, 168  
1
2
3
1
4
1
1. Forward Travel Adjustment Bolt  
2. Lower Control Arm  
2
Figure 23  
1. Deck Spindle  
2. Engine Drive Pulley  
3. Deck Idler  
REPLACING PTO BELT  
4. PTO Belt  
Remove  
(Figure 24)  
Figure 24  
1. Lower mower deck to the ground.  
2. Remove belt covers from mower deck.  
915148, 150, 170, 178, 180  
2
CAUTION: Use care when  
releasing idler spring tension.  
Keep body parts well away from  
idler when performing this  
operation.  
4
1
1
3
3. Rotate idler arm clockwise until tension  
is removed from PTO belt.  
4. Remove PTO belt from left mower deck  
pulley.  
5. Slowly release idler arm until tension is  
removed from idler spring.  
6. Remove PTO belt from mower deck and  
engine drive pulley.  
1. Deck Spindle  
2. Engine Drive Pulley  
3. Deck Idler  
4. PTO Belt  
Figure 25  
EN - 29  
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Install  
(Figure 24)  
4
2
1
NOTE: Do not install PTO belt on left mower  
deck pulley in step 1.  
2
1. Install PTO belt on engine drive pulley  
and mower deck.  
2. Rotate idler arm clockwise until PTO belt  
can be routed around left mower deck  
pulley.  
3. Slowly release idler arm until idler pulley  
rests firmly against PTO belt.  
4. Install belt covers on mower deck.  
3
NOTE: Ensure that belt is still positioned in  
the groove of the sheaves after belt covers  
are installed.  
REPLACING HYDROSTATIC BELT  
Remove  
1. Hydrostatic Belt  
2. Hydrostatic Transmission Pulley  
3. Idler  
(Figure 26)  
4. Idler Spring  
1. Remove PTO belt. See “REPLACING  
PTO BELT” on page 29.  
Figure 26  
CAUTION: Use care when  
releasing idler spring tension.  
Keep body parts well away from  
idler when performing this  
operation.  
STORAGE  
Short Term Storage  
IMPORTANT: NEVER clean unit with high-  
pressure water or store unit outdoors.  
Remove all dirt, grease, leaves, etc. Store in  
a clean dry area.  
2. Disconnect idler spring.  
3. Remove hydrostatic belt from  
hydrostatic transmission pulleys, drive  
pulley, and idler.  
Ensure all fasteners are properly tightened.  
Long Term Storage  
Install  
Follow all instructions under Short Term  
Storage.  
(Figure 26)  
1. Install hydrostatic belt on idler, drive  
pulley, and hydrostatic transmission  
pulleys.  
Remove and fully charge battery. Store in a  
clean dry area.  
Refer to Engine Manual for the proper engine  
storage procedures.  
2. Connect idler spring.  
3. Install PTO belt. See “REPLACING PTO  
BELT” on page 29.  
Touch up all scratched or chipped paint  
surfaces.  
Fuel System  
Gasoline left in the fuel system for extended  
periods without a stabilizer will deteriorate,  
resulting in gum deposits in the system.  
These deposits can damage the carburetor  
and the fuel hoses, filter and tank. Prevent  
deposits from forming in the fuel system  
during storage by adding a quality fuel  
stabilizer to the fuel. Follow the  
recommended mix ratio found on the fuel  
stabilizer container.  
EN - 30  
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IMPORTANT: NEVER store the engine with  
fuel in the fuel tank inside of a building with  
potential sources of ignition.  
Add Fuel Stabilizer  
1. Drain fuel from fuel tank.  
2. Allow the engine to run until it stops.  
Turn engine OFF when it begins surging  
to avoid engine damage.  
3. Add fuel stabilizer to fuel, following the  
manufacturer’s instructions.  
4. Pour fuel into the tank.  
5. Re-start engine.  
6. Run the engine outdoors for 1 to 2  
minutes to be sure that treated gasoline  
has replaced the untreated gasoline in  
the carburetor.  
7. Slow the engine to an idle speed.  
8. Repeat step 2.  
EN - 31  
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TROUBLESHOOTING  
PROBLEM  
PROBABLE  
CAUSE  
1. Safety interlock  
system is not  
engaged or is  
faulty.  
1. Check safety interlock system. See “Safety  
Interlock System” on page 14.  
2. Fuel tank is  
empty.  
2. Fill fuel tank. See “FILLING FUEL TANK”  
on page 17.  
3. Discharged  
battery.  
3. Charge battery. See “Charging the Battery”  
on page 27.  
Engine will not  
crank/start.  
4. Poor connection  
between battery  
and battery  
4. Tighten battery cables and/or clean battery  
and battery cables. See “Cleaning Battery  
and Battery Cables” on page 27.  
cables.  
5. Spark plug wire(s)  
loose or spark  
5. Connect spark plug wire(s) or replace spark  
plug(s). Refer to Engine Manual for detailed  
instructions.  
plug(s) faulty.  
6. Faulty electrical  
system.  
6. Contact your Gravely dealer.  
7. Faulty engine.  
7. Contact your Gravely dealer.  
1. Disengage choke.  
1. Choke engaged.  
Engine runs  
rough.  
2. Air filter cartridge  
plugged.  
2. Clean or replace air filter cartridge. Refer to  
Engine Manual for detailed instructions.  
3. Faulty engine.  
3. Contact your Gravely dealer.  
1. The transmission  
bypass lever is  
engaged.  
1. Disengage transmission bypass lever. See  
“MOVING UNIT MANUALLY” on page 19.  
Unit does not  
move with  
engine running  
when using  
2. Faulty hydrostatic  
belt.  
2. Replace hydrostatic belt. See “REPLACING  
HYDROSTATIC BELT” on page 30.  
steering levers.  
3. Faulty  
3. Contact your Gravely dealer.  
transmission.  
1. Operator  
1. Depress operator presence switch by sitting  
on seat.  
presence switch  
not depressed.  
2. Faulty operator  
presence switch.  
2. Contact your Gravely dealer.  
PTO or mower  
blades do not  
engage or shut  
off.  
3. Faulty PTO belt.  
3. Replace PTO belt. See “REPLACING PTO  
BELT” on page 29.  
4. Faulty PTO  
switch, wires,  
connectors, or  
clutch.  
4. Contact your Gravely dealer.  
1. Engine oil level  
low.  
1. Add engine oil. Refer to Engine Manual for  
detailed instructions.  
Engine  
overheats.  
2. Cooling system  
plugged.  
2. Clean cooling system. Refer to Engine  
Manual for detailed instructions.  
3. Faulty engine.  
3. Contact your Gravely dealer.  
EN - 32  
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PROBLEM  
PROBABLE  
CAUSE  
Unit moves with 1. The parking brake  
1. Contact your Gravely dealer.  
needs  
engine off and  
parking brake  
engaged.  
adjustment.  
2. Faulty parking  
brake.  
2. Contact your Gravely dealer.  
Unit does not  
travel in a  
1. Incorrect tire  
pressure.  
1. Check tire pressure. See  
“SPECIFICATIONS” on page 34.  
straight line.  
2. Steering levers  
need adjustment.  
2. Adjust steering levers. See “Forward Speed  
Adjustment” on page 28.  
3. Hydrostatic  
transmission  
and/or linkage  
needs  
3. Contact your Gravely dealer.  
1. Contact your Gravely dealer.  
adjustment.  
Unit creeps with 1. Hydrostatic  
transmission  
and/or linkage  
needs  
steering levers  
in neutral  
position.  
adjustment.  
Poor cutting  
quality.  
1. Mower deck not  
level or mower  
1. Level and adjust pitch of mower deck. See  
“LEVELING AND ADJUSTING PITCH OF  
MOWER DECK” on page 23.  
pitch is incorrect.  
2. Dull or faulty  
mower blades.  
2. Sharpen mower blades (see SHARPENING  
MOWER BLADE on page 24) or replace  
mower blades (see REPLACING MOWER  
BLADE on page 24).  
SERVICE PARTS  
Be sure to always use genuine Gravely  
ACCESSORIES  
See your authorized Gravely dealer to add  
parts to keep your unit running like new.  
these optional accessories to your unit.  
Part No.  
Description  
Part No.  
Description  
51519500  
34- and 50-Inch Spindle  
Assembly  
71503300 36-Inch Roller  
71503400 48-Inch Dethatcher  
71503600 Spreader  
51520900  
07100124  
07200116  
07200010  
42-Inch Spindle Assembly  
Front Wheel  
71508200 48-Inch Aerator  
71510800 34-Inch Mulch Kit  
71510900 Trailer Hitch Kit (915146, 168)  
34-Inch Deck Belt  
HA Raw Laminated Belt –  
Hydraulic Drive  
71513000 Washout Port Kit  
(915146, 168)  
03971900  
03797300  
04265400  
07200523  
03971900  
07200524  
34-Inch Mower Blade  
34-Inch Mulching Blade  
42-Inch Mower Blade  
42-Inch Deck Belt  
81513400 34-Inch Non-Powered Bagger  
81514200 42-Inch Non-Powered Bagger  
81515000 50-Inch Non-Powered Bagger  
71513100 42-Inch Mulch Kit  
50-Inch Mower Blade  
50-Inch Deck Belt  
71513200 50-Inch Mulch Kit  
EN - 33  
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SPECIFICATIONS  
Model Number  
Model  
915146  
915148  
915150  
ZT 50  
915168  
ZT 34  
ZT 42  
ZT 34  
CARB  
Engine  
Type  
Briggs &  
Stratton  
Kawasaki  
Briggs &  
Stratton  
3
30.51 (500)  
30.51 (500)  
44.3 (726)  
Engine Displacement in. (cc)  
Governed RPM (May be different  
from maximum RPM)  
3600 + 0  
3600 – 100  
Drive  
Forward Max. – m.p.h (km/h)  
Reverse Max. – m.p.h (km/h)  
Turning Radius  
6.0 (9.6)  
3.0 (4.8)  
Zero  
Brakes  
Internal Transmission  
Hydrostatic Drive  
Transmission  
Electrical  
Starter  
Electric  
Battery  
12V Maintenance Free 190 CCA  
Electric Clutch  
PTO (Power Take-Off)  
Fuel  
Fuel Type  
Refer to Engine Manual  
1.97 (7.49)  
Fuel Tank Capacity – gal. (L)  
Size and Weight  
Length – in. (cm)  
Width – in. (cm)  
65 (165.1)  
45 (114.3)  
438 (199)  
54 (137.2) 62 (157.5) 45 (114.3)  
Weight – lbs (kg)  
Height – in. (cm)  
495 (225)  
506 (230)  
42 (106.7)  
439 (199)  
40 (102)  
40 (102)  
Tires  
Front Tire Size – in.  
Rear Tire Size – in.  
Front Tire Pressure – psi (kPa)  
Rear Tire Pressure – psi (kPa)  
Mower Deck  
4 x 11  
18 x 6.5 x 8 18 x 8.5 x 8 18 x 9.5 x 8 18 x 6.5 x 8  
46 (317)  
10 (68.95)  
Cutting Height – in. (cm)  
Cutting width – in. (cm)  
Max. Towing Capacity – lbs (kg)  
Max. Tongue Weight – lbs (kg)  
1.5 – 4.5 (3.8 – 11.4)  
34 (86)  
42 (106.7)  
300 (136)  
30 (13.6)  
50 (127)  
34 (86)  
EN - 34  
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SPECIFICATIONS  
915170  
Model Number  
Model  
915178  
ZT 42  
915180  
ZT 50  
ZT 42 CARB  
Engine  
Type  
Kawasaki  
44.3 (726)  
Kohler  
3
44.2 (725)  
Engine Displacement in. (cc)  
Governed RPM (May be different from  
maximum RPM)  
3600 + 0  
3600 – 100  
Drive  
Forward Max. – m.p.h (km/h)  
Reverse Max. – m.p.h (km/h)  
Turning Radius  
6.0 (9.6)  
3.0 (4.8)  
Zero  
Brakes  
Internal Transmission  
Hydrostatic Drive  
Transmission  
Electrical  
Starter  
Electric  
Battery  
12V Maintenance Free 190 CCA  
Electric Clutch  
PTO (Power Take-Off)  
Fuel  
Fuel Type  
Refer to Engine Manual  
1.97 (7.49)  
Fuel Tank Capacity – gal. (L)  
Size and Weight  
Length – in. (cm)  
Width – in. (cm)  
65 (165.1)  
54 (137.2)  
496 (225) 489 (222)  
62 (157.5)  
Weight – lbs (kg)  
Height – in. (cm)  
501 (227)  
42 (106.7)  
40 (102)  
Tires  
Front Tire Size – in.  
Rear Tire Size – in.  
Front Tire Pressure – psi (kPa)  
Rear Tire Pressure – psi (kPa)  
Mower Deck  
4 x 11  
18 x 8.5 x 8  
18 x 9.5 x 8  
46 (317)  
10 (68.95)  
Cutting Height – in. (cm)  
Cutting width – in. (cm)  
Max. Towing Capacity – lbs (kg)  
Max. Tongue Weight – lbs (kg)  
1.5 – 4.5 (3.8 – 11.4)  
42 (106.7)  
50 (127)  
300 (136)  
30 (13.6)  
EN - 35  
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Consumer Mowing Equipment  
Limited Warranty  
Ariens Company (Ariens) warrants to the original purchaser that Ariens, Gravely and Countax brand  
lawn and garden consumer products purchased on or after 1/1/2013 will be free from defects in material  
and workmanship for the time period noted in the chart below. Equipment put to personal use around a  
single household or residence is considered “Consumer Use”; equipment put to any business use  
(agricultural, commercial, or industrial) or used at multiple locations is considered “Commercial Use.” If  
any product is rented or leased, then the duration of these warranties shall be 90 days after the date of  
purchase.  
An authorized Ariens dealer (Ariens brand products), Gravely dealer (Gravely brand products), or  
Countax dealer (Countax brand products) will repair any defect in material or workmanship, and repair or  
replace any defective part, subject to the conditions, limitations and exclusions set forth herein. Such  
repair or replacement will be free of charge (labor and parts) to the original purchaser except as noted  
below.  
Warranty  
Code  
Warranty Period  
Consumer Use  
Warranty Period  
Commercial Use  
Product Group  
Zoom & ZT Zero-Turn Riders;  
AMP™ Rider  
HA  
HB  
HC  
3 Years  
3 Years  
2 Years  
90 Days  
1 Year  
Max Zoom & ZT HD Zero-Turn Riders  
Tractors, "961" Series Walk-Behind  
Mowers  
90 Days  
Classic LM Series Mowers; Wide Area  
Walk Mowers; Razor, XD3  
HD  
3 Years  
90 Days  
N/A  
Service (replacement) Parts  
90 Days (no labor)  
90 Days (no labor)  
Special Extensions  
The chart below details special extensions to this warranty:  
Warranty  
Code  
Warranty  
Period  
Warranty Exception  
Use  
Detail  
3 years parts and labor  
Additional 2 years parts only  
Mower Deck Shell on  
Zero-Turn Riders  
HA, HB  
5 Years  
Consumer  
Consumer  
Main Frame on  
Zero-Turn Riders  
3 years parts and labor  
Additional 2 years parts only  
HA, HB  
HA  
5 Years  
2 Years  
Batteries for AMP™ Rider  
Consumer 100% first year; prorated second year  
Exceptions and Limitations  
The chart below details special exceptions to this warranty:  
Warranty  
Code  
Warranty  
Period  
Warranty Exception  
Batteries  
Use  
Detail  
All  
1 Year  
Consumer Prorated  
These components are not covered  
when used commercially.  
All  
Belts, Muffler, Tires  
None  
Commercial  
Cloth, Plastic, and  
Rubber Components  
(Including Belts and  
Cables)  
Warranty is limited to 2 years for  
consumer use. Except as noted above,  
these components are covered for  
defect, not for wear.  
Maximum  
2 Years  
All  
All  
All  
Engines are covered by engine  
manufacturer’s warranty. Refer to  
engine manufacturer’s warranty  
statement.  
See Engine  
Manufacturer’s  
Warranty  
Engines  
All  
Customer Responsibilities  
Register the product immediately at the time of sale. If the dealer does not register the product, the  
customer must complete the product registration card in the literature package and return it to the Ariens  
To obtain warranty service, the original purchaser must:  
• Perform the maintenance and adjustments explained in the owner's manual.  
• Promptly notify Ariens or an authorized Ariens, Gravely or Countax service representative of the need  
for warranty service.  
EN - 36  
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• Transport the product to and from the place of warranty service at owner's expense.  
• Have the warranty service performed by an authorized Ariens, Gravely or Countax service  
representative.  
To Find an Authorized Service Representative:  
In the U.S. and Canada:  
Use the dealer locator on our websites: www.ariens.com  
Or contact us by mail or by phone:  
In the U.S., Canada, Mexico, Caribbean, In Europe, Asia, Africa or  
In Australia or New Zealand:  
Central and South America:  
the Middle East:  
Ariens Company  
Building 2  
6 Wedgewood Rd.  
Hallam, Victoria 3803 Australia  
Phone: (03) 9796 4244  
1800 335 489  
Ariens Company  
655 W. Ryan Street  
Brillion, WI 54110  
Phone: (920) 756 - 4688  
Countax Ltd, Countax House  
Great Haseley, Oxfordshire,  
OX44 7PF  
Phone: 0800 597 7777  
Exclusions – Items Not Covered by This Warranty  
Parts that are not genuine Ariens, Gravely or Countax service parts are not covered by this  
warranty and may void the warranty.  
Damages resulting from the installation or use of any part, accessory, or attachment which is not  
approved by the Ariens Company for use with product(s) identified herein are not covered by this war-  
ranty.  
The following maintenance, service and replacement items are not covered by this warranty unless  
they are noted in the Limitations section above: lubricants, spark plugs, oil, oil filters, air  
filters, fuel filters, brake linings, brake arms, brake shoes, skid shoes, scraper blades, shear bolts,  
mower blades, mower vanes, brushes, headlights, light bulbs, knives, cutters.  
Any misuse, alteration, improper assembly, improper adjustment, neglect, or accident which requires  
repair is not covered by this warranty.  
Use of gasoline blends exceeding 10% ethanol voids any and all warranties.  
Products are designed to the specifications in the area that the product was originally distributed. Dif-  
ferent areas may have significantly different legal and design requirements. This warranty is limited to  
the requirements in the area in which the unit was originally distributed. Ariens Company does not  
warrant this product to the requirements of any other area. Warranty service is limited to service  
within the area originally distributed.  
In countries other than the United States and Canada, contact the Ariens Company dealer for  
warranty policies that govern within your country. Rights may vary from country to country and within  
any one country.  
Disclaimer  
Ariens Company may from time to time change the design of its products. Nothing contained in this  
warranty shall be construed as obligating the Ariens Company to incorporate such design changes into  
previously manufactured products, nor shall such changes be construed as an admission that previous  
designs were defective.  
LIMITATION OF REMEDY AND DAMAGES  
Ariens Company's liability under this warranty, and under any implied warranty that may exist, is limited to  
repair of any defect in workmanship, and repair or replacement of any defective part. Ariens Company  
shall not be liable for incidental, special, or consequential damages (including lost profits). Some states  
do not allow the exclusion of incidental or consequential damages, so the above limitation or exclusion  
may not apply to you.  
AUSTRALIAN CONSUMER LAW  
The following applies solely to warranties subject to Subsection 102(1) of the Australian Consumer Law:  
Our goods come with guarantees that cannot be excluded by the Australian Consumer Law. You are  
entitled to a replacement or refund for a major failure and for compensation for any other reasonably  
foreseeable loss or damage. You are also entitled to have the goods repaired or replaced if the goods fail  
to be of acceptable quality and failure does not amount to a major failure.  
DISCLAIMER OF FURTHER WARRANTY  
Ariens Company makes no warranty, express or implied, other than what is expressly made in  
this warranty. If the law of your state provides that an implied warranty of merchantability, or an  
implied warranty of fitness for particular purpose, or any other implied warranty, applies to Ariens  
Company, then any such implied warranty is limited to the duration of this warranty. Some states  
do not allow limitations on how long an implied warranty lasts, so the above limitation may not  
apply to you.  
This warranty gives you specific legal rights, and you may also have other rights which vary from region to  
region.  
EN - 37  
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Consumer 2013  
Gravely  
655 West Ryan Street  
Brillion, WI 54110  
920-756-4688  
Fax 920-756-2407  
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