ST0521M
ST0521E
Snow Thrower
OPERATOR’S
MANUAL
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RULES FOR SAFE OPERATION
IMPORTANT
WARNING: Always disconnect the spark plug wire and place it where it cannot make contact with
spark plug to prevent accidental starting during: Preparation, Maintenance, or Storage of your
snowthrower.
Safe Operation Practices for Snowthrowers
As Recommended By: American National Standards Institute.
a. Use an approved fuel container.
b. Never remove fuel tank cap or add fuel to a running en-
gine (motor) or hot engine (motor).
Engine Exhaust, some of its constituents, and
certain vehicle components contain or emit
chemicals known to the State of California to
cause cancer and birth defects or other repro-
ductive harm.
c. Fill fuel tank outdoors with extreme care. Never fill fuel
tank indoors.
d. Replace fuel cap securely and wipe up spilled fuel.
e. Never store fuel or snowthrower with fuel in the tank
inside of a building where fumes may reach an open
flame or spark.
Battery posts, terminals and related accesso-
ries contain lead and lead compounds, chemi-
cals known to the State of California to cause
cancer and birth defects or other reproductive
harm. WASH HANDS AFTER HANDLING.
f. Check fuel supply before each use, allowing space for
expansion as the heat of the engine (motor) and/or sun
can cause fuel to expand.
5. For all units with electric starting motors use electric
starting extension cords certified CSA/UL. Use only with
a receptacle that has been installed in accordance with
local inspection authorities.
6. Adjust the snowthrower height to clear gravel or crushed
rock surface.
7. Never attempt to make any adjustments while the en-
gine (motor) is running (except when specifically recom-
mended by manufacturer).
IMPORTANT: Safety standards require operator presence
controls to minimize the risk of injury. Your snowthrower is
equipped with such controls. Do not attempt to defeat the
function of the operator presence control under any cir-
cumstances.
8. Let engine (motor) and snowthrower adjust to outdoor
temperatures before starting to clear snow.
9. Always wear safety glasses or eye shields during oper-
ation or while performing an adjustment or repair to pro-
tect eyes from foreign objects that may be thrown from
the snowthrower.
Training
1. Read the operating and service instruction manual care-
fully. Be thoroughly familiar with the controls and the
proper use of the equipment. Know how to stop the unit
and disengage the controls quickly.
2. Never allow children to operate the equipment. Never
allow adults to operate the equipment without proper
instruction.
Operation
1. Do not operate this machine if you are taking drugs or
other medication which can cause drowsiness or affect
your ability to operate this machine.
3. Keep the area of operation clear of all persons, particu-
larly small children and pets.
2. Do not use this machine if you are mentally or physically
unable to operate this machine safely.
4. Exercise caution to avoid slipping or falling especially
when operating in reverse.
3. Do not put hands or feet near or under rotating parts.
Keep clear of the discharge opening at all times.
4. Exercise extreme caution when operating on or crossing
gravel drives, walks or roads. Stay alert for hidden haz-
ards or traffic.
5. After striking a foreign object, stop the engine (motor),
remove the wire from the spark plug, thoroughly inspect
snowthrower for any damage, and repair the damage
before restarting and operating the snowthrower.
6. If the unit should start to vibrate abnormally, stop the
engine (motor) and check immediately for the cause.
Vibration is generally a warning of trouble.
Preparation
1. Thoroughly inspect the area where the equipment is to
be used and remove all doormats, sleds, boards, wires,
and other foreign objects.
2. Disengage all clutches before starting the engine
(motor).
3. Do not operate the equipment without wearing adequate
winter outer garments. Wear footwear that will improve
footing on slippery surfaces.
4. Handle fuel with care; it is highly flammable.
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RULES FOR SAFE OPERATION
7. Stop the engine (motor) whenever you leave the operat-
Maintenance And Storage
ing position, before unclogging the auger/impeller hous-
ing or discharge chute and when making any repairs,
adjustments, or inspections.
1. Check shear bolts and other bolts at frequent intervals
for proper tightness to be sure the equipment is in safe
working condition.
8. When cleaning, repairing, or inspecting, make certain
the auger/impeller and all moving parts have stopped
and all controls are disengaged. Disconnect the spark
plug wire and keep the wire away from the spark plug to
prevent accidental starting.
2. Never store the snowthrower with fuel in the tank inside
a building where ignition sources are present such as
hot water and space heaters, clothes dryers, and the
like. Allow the engine (motor) to cool before storing in
any enclosure.
9. Take all possible precautions when leaving the snow-
thrower unattended. Disengage the auger/ impeller, stop
engine (motor), and remove key.
3. Always refer to operator’s guide instructions for import-
ant details if the snowthrower is to be stored for an ex-
tended period.
10.Do not run the engine (motor) indoors, except when
starting the engine (motor) and for transporting the
snowthrower in or out of the building. Open the outside
doors; exhaust fumes are dangerous (containing CAR-
BON MONOXIDE, an ODORLESS and DEADLY GAS).
4. Maintain or replace safety and instruction labels, as
necessary.
5. Run the snowthrower a few minutes after throwing
snow to prevent freeze- up of the auger/impeller.
11. Do not clear snow across the face of slopes. Exercise
extreme caution when changing direction on slopes. Do
not attempt to clear steep slopes.
12.Never operate the snowthrower without proper guards,
plates or other safety protective devices in place.
13.Never operate the snowthrower near enclosures, auto-
mobiles, window wells, drop- offs, and the like without
proper adjustment of the snow discharge angle. Keep
children and pets away.
WARNING: Avoid
injury from rotating
auger- keep hands,
feet, and clothing
away.
14.Do not overload the machine capacity by attempting to
clear snow at too fast a rate.
15.Never operate the machine at high transport speeds on
slippery surfaces. Look behind and use care when back-
ing up.
16.Never direct discharge at bystanders or allow anyone in
front of the unit.
17.Disengage power to the collector/impeller when snow-
thrower is transported or not in use.
WARNING: Do not
use hands to un-
clog discharge
chute.
18.Use only attachments and accessories approved by the
manufacturer of the snowthrower (such as tire chains,
electric start kits, ect.).
19.Never operate the snowthrower without good visibility or
light. Always be sure of your footing and keep a firm
hold on the handles. Walk;never run.
• Stop engine/motor before removing debris.
• Do not walk in front of running machine.
• Do not discharge at bystanders.
20.Do not over- reach. Keep proper footing and balance at
all times.
21.Exercise caution if operating on steep sloping surfaces.
• Keep people and pets a safe distance from the
machine.
22.This snowthrower is for use on sidewalks, driveways
and other ground level surfaces.
• Before leaving machine, shut off engine/ motor
and remove key.
23.Do not use the snowthrower on surfaces above ground
level such as roofs of residences, garages, porches or
other such structures or buildings.
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TABLE OF CONTENTS
SAFETY DECALS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
OWNER’S INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
PARTS BAGS CONTENTS: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
TOOLS REQUIRED FOR ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
HOW TO REMOVE THE SNOW THROWER FROM THE CARTON . 8
HOW TO INSTALL THE CHUTE CRANK . . . . . . . . . . . . . . . . . . . . . . . . . 8
HOW TO ASSEMBLE THE HANDLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
HOW TO INSTALL THE CHUTE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
ENGINE AND SNOW THROWER OPERATING CONTROLS . . . . . . . 11
SNOWTHROWER OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
HOW TO STOP THE SNOWTHROWER . . . . . . . . . . . . . . . . . . . . . . . . . 12
HOW TO CONTROL SNOW DISCHARGE . . . . . . . . . . . . . . . . . . . . . . . 12
HOW TO THROW SNOW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
HOW TO MOVE FORWARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
HOW TO MIX THE FUEL MIXTURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
BEFORE STARTING THE ENGINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
HOW TO STOP THE ENGINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
HOW TO START THE ENGINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
HOW TO REMOVE SNOW FROM THE AUGER HOUSING . . . . . . . . 15
SNOW THROWING TIPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
SERVICE RECOMMENDATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
LUBRICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
HOW TO LUBRICATE THE IDLER ARM . . . . . . . . . . . . . . . . . . . . . . . . . 17
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
HOW TO ADJUST THE BELT TENSION . . . . . . . . . . . . . . . . . . . . . . . . . 18
HOW TO REPLACE THE AUGER BELT . . . . . . . . . . . . . . . . . . . . . . . . . 18
HOW TO FREE THE AUGER CABLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
HOW TO ADJUST THE CHUTE CRANK . . . . . . . . . . . . . . . . . . . . . . . . . 20
HOW TO ADJUST THE AUGER CONTROL CABLE . . . . . . . . . . . . . . . 20
HOW TO REPLACE THE DRIVE BELT . . . . . . . . . . . . . . . . . . . . . . . . . . 21
HOW TO REPLACE THE AUGER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
TO ADJUST THE CARBURETOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
TO ADJUST OR REPLACE THE SPARK PLUG . . . . . . . . . . . . . . . . . . . 23
STORAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
TROUBLE SHOOTING CHART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
REPLACEMENT PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
PARTS SCHEMATICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
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SAFETY DECALS
the meaning, then thoroughly read all safety and operation
instructions in this Owner’s Manual or contact your local
dealer.
WARNING: If safety decals are dam-
aged or missing, replace immediately.
If any safety decals become worn or damaged and cannot
be read, order replacement decals from your local dealer.
Look for this symbol to indicate important safe-
ty precautions. This symbol indicates: “Atten-
tion! Become Alert! Your Safety Is At Risk.”
Identifying Your Snowthrower
The snowthrower has two (2) identifying numbers: (1) unit
model number: (2) unit serial number. The two preceding
numbers are required to insure that the proper replace-
ment parts are obtained when required. If you have any
questions concerning parts, service, or technical data, con-
tact the dealer where the unit was purchased.
Before operation of your snowthrower, read the safety de-
cals as shown on your snowthrower. The cautions and
warnings are for your safety. To avoid a personal injury or
damage to your snowthrower, understand and follow all
safety decals. If you have any questions regarding the
meaning or how to comply with the instructions, do not op-
erate until you understand the purpose for the warning or
danger given in the safety decal. If you do not understand
For complete warranty information refer to the warranty in
the Owner’s Information section of this manual.
Figure 1
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OWNER’S INFORMATION
THREE YEAR LIMITED WARRANTY
Murray warrants to the original purchaser of this Frontier Branded Snowthrower that this unit shall be free from defects in
material and workmanship under normal use and service for a period of Three (3) Year from the date of purchase; however,
this warranty does not cover accessories (such as electric starters) and Normal Wear Parts (except as noted below) as the
companies that manufacture these items furnish their own warranties and provide service through their authorized field
service facilities. For additional information, see the warranties covering these particular parts. If you are uncertain whether
your unit contains or is equipped with one or more of these parts, consult your dealer prior to purchase. Subject to the terms
and conditions noted in this Limited Warranty, we shall, at our option, repair or replace at no cost to the original purchaser
any part covered by this Limited Warranty during the applicable warranty period.
Normal Wear Parts are defined as drive belts, augers, shear pins, tires and headlights. These parts are warranted to be free
from defects in material and workmanship as delivered with the product. Any claim for repair or replacement of Normal Wear
Parts must be made within thirty (30) days of the date of purchase. No claims involving damage caused from material use,
abuse or misuse will be honored.
This Murray Three (3) Year Limited Warranty for your Frontier Branded Snowthrower is your exclusive remedy; however,
this warranty is void or does not apply to any unit that has been tampered with, altered, misused, abused. If used for
commercial and/or professional (non-homeowner) uses, the duration of this warranty is ninety (90) days after the date of
purchase. Your warranty does not cover minor mechanical adjustments which are not due to any defect in material or
workmanship. For assistance in making such adjustments, consult your Operator’s Manual.
The engine on this Frontier Branded Snowthrower is warranted to the original purchaser for only a Two (2) Year Limited
Warranty. See your engine manual for information regarding the warranty policy and items covered under warranty. See
MT
your authorized John Deere/Frontier Dealer for service or replacement parts.
To make a claim under this Murray Three (3) Year Limited Warranty for your Frontier Branded Snowthrower, return the unit
(or if authorized in advance, the defective part) along with your proof of purchase to an Authorized John Deere/Frontier Dealer
near you. To locate the nearest Authorized John Deere/Frontier Dealer, check the Yellow Page listings in your local telephone
directory. If you return the entire unit, John Deere/Frontier will repair all warranty items. If authorize to return the defective
part only, John Deere/Frontier will either replace or repair the part. This Murray Three (3) Year Limited Warranty for your
Frontier Branded Snowthrower gives you specific legal rights, and you may also have other rights which vary from state to
state. This Limited Warranty is given in lieu of all other expressed and implied warranties including the implied
warranty of merchantability and warranty of fitness for a particular purpose. If you need additional information on this
written warranty or assistance in obtaining service, contact you local John Deere/Frontier Dealer.
FOR YOUR RECORDS
DATE PURCHASED:
MODEL NO:
SERIAL NO:
STORE WHERE PURCHASED:
ADDRESS:
CITY:
STATE:
TELEPHONE :
Record this information about your unit so that you will
be able to provide it in case of loss or theft.
7
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ASSEMBLY
PARTS BAGS CONTENTS:
WARNING: Always wear safety glasses or eye
shields while assembling the snowthrower.
1 - 2.6 ounces 2-cycle oil
1 - Owner’s Manual
Figure 6 shows the snow thrower in the operating position.
TOOLS REQUIRED FOR ASSEMBLY
1-Knife
References to the right or left hand side of the snow throw-
er are from the viewpoint of the operator’s position behind
the unit.
1-Pliers
2-Adjustable Wrenches
3. Cut down all four corners of the carton and lay the side
panels flat.
HOW TO REMOVE THE SNOW THROWER
FROM THE CARTON
4. Cut off the plastic bag that covers the snowthrower.
1. Locate all parts that are packed separately and remove
from the carton.
5. Hold onto the lower handle and pull the snow thrower off
the carton.
CAUTION: DO NOT back over cables.
2. Remove and discard the packing material from around
the snow thrower.
6. Remove the packing material from the handle assembly.
HOW TO INSTALL THE CHUTE CRANK
Chute Crank
Rod
1. Remove the screw and nut from the shaft (see
Figure 2).
2. Put the chute crank rod through the bracket on the low-
er handlebar.
Nut
3. Install the chute crank rod onto the shaft.
4. Fasten the chute crank rod with the screw and nut that
were removed in step 1.
Screw
Shaft
5. Raise the upper handle to the operating position. Hold
the upper handle apart to prevent scratching the lower
handle.
6. Line up the holes.Tighten the knobs.
Figure 2
8
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ASSEMBLY
HOW TO ASSEMBLE THE HANDLE
1. Remove the packing material from the upper and
lower handles.
NOTE: Make sure the cables are not caught between
the upper and lower handle.
2. Loosen the knobs on each side of the handle. (See
Figure 3)
4. Tighten the knobs.
3. Raise the upper handle to the operating position (see
Figure 4). Hold the upper handle apart to prevent
scratching the lower handle.
Upper Handle
Upper Handle
Knob
Lower Handle
Knob
Lower Handle
Figure 3
Figure 4
HOW TO INSTALL THE CHUTE
1. Remove the three bolts and lock nuts from the chute
2. Install the chute with the bolts and locknuts. Make
sure the locknuts are to the outside as shown.
base (see Figure 5).
Chute
Locknuts
Chute
Figure 6
Figure 5
9
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ASSEMBLY
n CHECKLIST
Before you operate your new snowthrower, to ensure that
you receive the best performance and satisfaction from
this quality product, please review the following checklist:
n All assembly instructions have been completed.
n The discharge chute rotates freely.
n No remaining loose parts in carton.
While learning how to use your snow thrower, pay extra
attention to the following important items:
n Make sure the fuel tank is filled with the correct mixture
(50:1 ratio) of gasoline and oil.
n Become familiar with the location of all controls and un-
derstand their function.
n Before starting the engine, make sure all controls oper-
ate correctly.
10
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OPERATION
KNOW YOUR SNOWTHROWER
READ THIS OWNER’S MANUAL AND SAFETY RULES BEFORE OPERATING YOUR SNOWTHROWER. Compare the
illustrations with your SNOWTHROWER to familiarize yourself with the location of various controls and adjustments. Save
this manual for future reference.
Auger Drive Lever
Chute Control Rod
Chute Deflector
Recoil
Starter
Primer
Button
Recoil
Starter
Handle
Discharge Chute
Ignition Switch
Key
Choke Control
Figure 7
ENGINE AND SNOW THROWER OPERATING CONTROLS
The engine operating controls and their functions are as
follows:
Ignition Switch Key - Must be inserted and turned to the
ON position to start the engine.
Auger Drive Lever - Starts and stops the auger.
Recoil Starter Handle - Starts the engine manually.
Chute Control Rod - Changes the direction of snow throw-
ing through the discharge chute.
Electric Starter Button - (Not shown) On electric start mod-
els, use to start the engine when using the 120V electric
starter.
Chute Deflector - Changes the distance the snow is
thrown.
Choke Control - Used to start a cold engine.
Discharge Chute - Changes the direction the snow is
thrown.
Primer Button - Injects fuel directly into the carburetor
manifold for fast starts in cold weather.
11
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OPERATION
NOTE: If the snowthrower continues to slowly move
forward, see “How To Adjust The Auger Control
Cable” in the Maintenance Section.
SNOWTHROWER OPERATION
The most effective use of the snowthrower will be established
by experience, taking into consideration the terrain, wind
conditions and building location which will determine the
direction of the discharge chute.
8. To stop the engine, move the ignition key to the OFF
position.
NOTE: Do not discharge snow toward a building as
hidden objects could be thrown with sufficient force to
cause damage.
HOW TO CONTROL SNOW DISCHARGE
1. Turn the chute control rod to set the direction of the
snow throwing. (See Figure 7)
WARNING: Read Owner’s Manual before oper-
ating machine. This machine can be dangerous
if used carelessly.
2. Loosen the wing knob on the chute deflector and move
the deflector to set the distance. Move the deflector (Up)
for more distance, (Down) for less distance. Then tighten
the wing knob (See Figure 8).
Never operate the snowthrower without all guards,
covers, and shields in place.
Never direct discharge toward windows or allow by-
standers near machine while engine is running.
Stop the engine whenever leaving the operating posi-
tion.
Deflector Down
Deflector Up
Disconnect spark plug before unclogging the impeller
housing or the discharge chute and before making re-
pairs or adjustments.
When leaving the machine, remove the ignition key.
To reduce the risk of fire, keep the machine clean and
free from spilled gas, oil and debris.
Wing Knob
HOW TO STOP THE SNOWTHROWER
Figure 8
7. To stop throwing snow, release the auger drive lever.
(See Figure 9).
NOTE: If the auger continues to rotate, see “How To
Adjust The Auger Control Cable” in the Maintenance
section.
HOW TO THROW SNOW
1. Engage the auger drive lever. (See Figure 9).
2. To stop throwing snow, release the auger drive lever.
HOW TO MOVE FORWARD
1. Hold the auger drive lever against the handle (See
Figure 9). The auger will begin rotating.
Auger
Drive Lever
2. To go forward, raise the handle to allow the rubber au-
ger blades to contact the ground. Maintain a firm hold on
the handle as the snowthrower starts to move forward.
Guide the snowthrower by moving the handle either left
or right. Do not attempt to push the snowthrower.
“Z” Hook
Figure 9
3. To stop, release the auger drive lever.
12
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OPERATION
Mix gasoline and oil as follows:
BEFORE STARTING THE ENGINE
WARNING: Experiences indicates that alcohol
blended fuels (called gasohol or those using
ethanol or methanol) can attract moisture
1. Pour one (1) U.S. quart of fresh, clean, unleaded auto-
motive gasoline into a one gallon size gasoline con-
tainer.
which leads to separation and formation of acids dur-
ing storage. Acidic gas can damage the fuel system
of an engine while in storage.
2. Add 2.6 ounces of clean, high quality, two-cycle oil to
the gasoline container.
NOTE: To avoid engine problems, the fuel system
must be emptied before storage for 30 days or longer.
Start the engine and let it run until the fuel lines and
carburetor are empty. Use the carburetor bowl drain
to empty residual gasoline from the float chamber.
Use fresh fuel next season. See the Storage section in
this manual for additional information.
IMPORTANT: Do not use outboard motor oil or
multi-viscosity oils,such as 10W-30 or 10W-40.
3. Install the fuel cap onto the gasoline container. Vigor-
ously shake the gasoline container to mix the oil with
the gasoline.
4. Add an additional three (3) U.S. quarts of gasoline to
the gallon container. Again shake the gasoline contain-
er.
Never use engine or carburetor cleaner products in the
fuel tank or permanent damage can occur.
WARNING: Gasoline is flammable. Always use
caution when handling or storing gasoline.
Do not fill fuel tank while snow thrower is run-
ning, when it is hot, or when snow thrower is in an
enclosed area.
Keep away from open flame or an electrical spark and
do not smoke while filling the fuel tank.
Never fill the tank completely. Fill the tank to within
1/4”-1/2” from the top to provide space for expansion
of fuel.
HOW TO MIX THE FUEL MIXTURE
The two cycle engine, used on this snow thrower, requires
a mixture of gasoline and oil for lubrication of the bearings
and other moving parts. The correct fuel mixture ratio is
50:1 (2.6 oz. oil per one gallon of gas - see the Fuel Mix-
ture Chart). Gasoline and oil must be pre-mixed in a clean
gasoline container. Always use fresh, clean, unleaded gas-
oline.
FUEL MIXTURE CHART (mixture 50:1)
Always fill fuel tank outdoors and use a funnel or
spout to prevent spilling.
Make sure to wipe up any spilled fuel before stating
the engine.
Store gasoline in a clean, approved container and
keep the cap in place on the container.
U.S.
IMPERIAL
SI. (Metric)
GAS
OIL
GAS
1 Gal.
OIL
GAS
OIL
1 Gal.
2.6
oz.
3.1 oz.
4
liter
80
ML
Do not fill the fuel tank with gasoline that does not have oil mixed in it. Shake the gasoline container before
each filling of the fuel tank.
Add more gas
(3 U. S. Quarts)
1 U.S.
Gallon
Special
Gasoline
1 U.S. Gallon container
Figure 10
13
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OPERATION
3. Before starting the engine, make sure all controls oper-
BEFORE STARTING THE ENGINE
ate correctly.
1. Before you service or start the engine, familiarize your-
self with the snow thrower. Be sure you understand the
function and location of all controls.
HOW TO STOP THE ENGINE
2. Be sure that all fasteners are tight.
To stop the engine, move the ignition key to the stop position.
S
S
Push four times if temperature is below 15° F (-10° C).
Push five time if temperature is below 0° F (-18° C).
HOW TO START THE ENGINE
The following starting instructions include directions for both
Recoil Start and Electric Start engines. For models that are
Recoil Start only, disregard the Electric Start information.
9. (Electric Start) Push on the electric start button until
the engine starts. Do not crank for more than 10 seconds
at a time. The electric starter is thermally protected. If the
electric starter overheates, it will automatically stop and
can only be restarted when it has cooled to a safe tem-
perature. A wait of about 5 to 10 minutes is required to
allow the electric starter to cool.
Electric Start models are equipped with a 120 volt AC elec-
tric starter and also a recoil starter. Before starting the en-
gine, make certain that you have read the following
information.
The starter is designed to operate on 120 volt A.C.
household current. Carefully follow all instruc-
tions in the “How To Start The Engine” section.
To connect a 120 volt A.C. power cord, always connect
the power cord to the switch box on the engine first.
Then, plug the other end into the receptacle. When dis-
connecting the power cord, always unplug the end from
the receptacle first.
10. (Recoil Start) Rapidly pull the recoil starter handle. Do
not allow the recoil starter handle to snap back. Slowly
return the recoil starter handle.
11. If the engine does not start in 5 or 6 tries, See the “Trouble
Shooting Chart” Instructions.
12. (Electric Start) When the engine starts, release the
electric start button.
13. (Electric Start) First disconnect the power cord from the
receptacle. Then, disconnect the power cord from the
switch box.
HOW TO START A COLD ENGINE
1. Fill the fuel tank with a fresh, clean fuel mixture. See
“How To Mix The Fuel Mixture”.
14. As the engine warms up, move the choke control to 1/2
choke position. When the engine runs smoothly, move
the choke control to the off position.
2. Move the choke control to FULL position.
3. Make sure the auger drive lever is in the disengaged
NOTE: Allow the engine to warm up for several minutes
before blowing snow in temperatures below 05F.
(released) position.
4. Insert the ignition key and turn to the ON position.
5. Move the choke control to the full choke position.
WARM START
If restarting a warm engine after a short shutdown, leave
choke at “OFF” and do not push the primer button. If the en-
gine fails to start, follow the Cold Start instructions.
6. (Electric Start) Connect the power cord to the switch
box located on the engine.
7. (Electric Start) Plug the other end of the power cord into
a 120 VOLT, A.C. receptacle. (See the WARNING in this
section).
WARNING: Never run engine indoors or in en-
closed, poorly ventilated areas. Engine exhaust
contains CARBON MONOXIDE, AN ODORLESS
AND DEADLY GAS. Keep hands, feet, hair and loose
clothing away from any moving parts on engine and
snow thrower.
8. Push the primer button while covering the vent hole as
follows: Remove finger from primer button between
primes.
The temperature of muffler and nearby areas may ex-
ceed 1505F. Avoid these areas.
S
S
Do not prime if temperature above 50° F (10° C).
DO NOT allow children or young teenagers to operate
or be near snow thrower while it is operating.
Push twice if temperature is 50° F (10° C) to
15°F (-10° C).
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OPERATION
1. Release the auger drive lever.
HOW TO REMOVE SNOW FROM THE AUGER
HOUSING
2. Remove the ignition key.
3. Disconnect the spark plug wire.
WARNING: Do not attempt to remove snow or
debris that may become lodged in auger
housing without taking the following precau-
4. Do not place your hands in the auger housing or the dis-
charge chute. Use a pry bar to remove any snow or de-
bris.
tions.
10. After each snow throwing job, allow the engine to run for
a few minutes. The snow and accumulated ice will melt
off the engine.
SNOW THROWING TIPS
1. When the handle is raised, the auger blades will engage
the ground and the snow thrower will move forward.
When the auger drive lever is released, the auger blades
will stop. If the blades do not stop, see “How To Adjust
The Auger Control Cable” in the Service And Adjustment
section.
11. Clean the snow thrower after each use.
12. Remove ice, snow and debris from the entire snow
thrower. Flush with water to remove all salt or other
chemicals. Wipe snow thrower dry.
2. Most efficient snow throwing is accomplished when the
snow is removed immediately after if falls.
DRY AND AVERAGE SNOW
3. For complete snow removal, slightly overlap each pre-
vious path.
1. Snow up to eight inches deep can be removed rapidly
and easily by walking at a moderate rate. For snow or
drifts of a greater depth,slow your pace to allow the dis-
charge chute to dispose of the snow as rapidly as the au-
ger receives the snow.
4. Whenever possible, discharge the snow down wind.
5. The distance the snow will be discharged can be ad-
justed by moving the discharge chute deflector. Raise
the deflector for more distance or lower the deflector for
less distance.
2. Plan to have the snow discharged in the direction the
wind is blowing.
6. In windy conditions, lower the chute deflector to direct the
discharged snow close to the ground where it is less like-
ly to blow into unwanted areas.
WET PACKED SNOW
Move slowly into wet, packed snow. If the wet, packed snow
causes the auger to slow down or the discharge chute begins
to clog, back off and begin a series of short back and forth
jabs into the snow. These short back and forth jabs, four to six
inches, will “belch” the snow from the chute.
7. For safety and to prevent damage to the snow thrower,
keep the area to be cleared free of stones, toys and other
foreign objects.
8. Do not use the auger propelling feature when clearing
gravel or crushed rock driveways. Move the handle down
to slightly raise the auger.
SNOW BANKS AND DRIFTS
In snow of greater depth than the unit, use the same “jabbing”
technique described above. Turn the discharge chute away
from the snow bank. More time will be required to remove
snow of this type than level snow.
9. The forward speed of the snow thrower is dependent on
the depth and weight of the snow. Experience will estab-
lish the most effective method of using the snow thrower
under different conditions.
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SERVICE RECOMMENDATIONS
SERVICE RECOMMENDATIONS
FIRST
2
HOUR
BEFORE
EACH
USE
EVERY
5
HOURS
EVERY
10
HOURS
EVERY
25
HOURS
BEGINNING
EACH
SEASON
BEFORE
STORAGE
PROCEDURE
OFTEN
S
N
O
W
T
Tighten all screws and nuts
√
√
√
√
√
Lubricate Chute Control
Flange
√
√
Lubricate Auger Bail
H
R
Check Auger Drive Cable
Adjustment
(See Cable Adjustment)
O
W-
E
√
√
Check Drive Belt
R
The warranty on this snowthrower does not cover items that have been subjected to operator abuse or negligence. To receive
full value from the warranty, operator must maintain snowthrower as instructed in this manual. The following Service Recom-
mendations are supplied to assist operator to properly maintain snow thrower. This is a check list only. Adjustment referred
to will be found in Adjustments/Repairs section of this manual.
AFTER EACH USE
1. Check for any loose or damaged parts.
2. Tighten any loose fasteners.
Auger Bail
3. Check and maintain the auger.
4. After each use, remove all snow and slush off of the
snowthrower to prevent freezing of auger or controls.
5. Check controls to make sure they are functioning
properly.
Pivot
Point
6. If any parts are worn or damaged, replace immediately.
LUBRICATION
Before Storage
1. Lubricate the chute control flange. Apply a clinging
type of grease such as Lubriplate (see Figure 11).
2. Apply oil to the pivot point on each side of the auger
bail (see Figure 11).
Chute Control
Flange
Figure 11
3. Wipe off the excess oil.
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SERVICE RECOMMENDATIONS
HOW TO LUBRICATE THE IDLER ARM
CAUTION: DO NOT get oil on the belt or pulleys.
Idler Arm
1. Remove the screws from the belt cover. Remove the belt
cover.
B
2. Apply a drop of oil to the idler arm at point B (see
Figure 12).
3. Pivot the auger bail up and down several times.
4. Wipe off the excess oil.
5. Install the cover.
Figure 12
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MAINTENANCE
11. Remove the boot from the auger cable spring as fol-
HOW TO ADJUST THE BELT TENSION
lows:
IMPORTANT: When you release the auger bail, the au-
ger must stop rotating. If the auger does not stop, ad-
just the belt tension as follows:
S Disconnect the end of the idler spring from the
idler arm (see Figure 14).
S Remove the auger belt from the idler pulley.
1. Disconnect the spark plug wire from the spark plug.
2. Remove the belt cover.
3. Loosen the idler pulley nut (see Figure 14).
4. Move the idler pulley to the bottom of the idler arm
slot. If the idler pulley is already in the bottom posi-
tion, replace the auger belt. See How To Replace The
Auger Belt in the Maintenance section.
S Remove the end of the auger cable spring from
the auger bail (see Figure 13).
S Remove the boot from the auger cable spring.
S Attach the end of the auger cable spring to the
auger bail.
12. To adjust the auger cable spring:
5. Tighten the idler pulley nut.
S Install the auger belt to the idler pulley (see
6. Install the belt cover.
Figure 14).
HOW TO REPLACE THE AUGER BELT
1. Disconnect the spark plug wire from the spark plug.
2. Remove the belt cover.
S Attach the idler spring to the idler arm.
S Loosen the jam nut (see Figure 13).
S Turn the adjuster until the auger cable is slightly
3. Remove the belt guide (see Figure 14).
4. Remove the auger belt from the engine drive pulley.
5. Push down the idler arm to move the brake away the
auger drive pulley. Remove the auger belt from the
auger drive pulley.
6. Loosen the idler pulley nut. Move the idler pulley to the
top of the idler arm slot. Tighten the idler pulley nut.
7. Install a new auger belt.
slack.
S Tighten the jam nut.
13. Remove the idler spring from the idler arm (see
Figure 14). Remove the auger belt from the idler
pulley. Install the boot to the auger cable spring.
14. Install the auger belt, idler spring, and belt cover.
8. Install the belt guide. Make sure the fasteners that
secure the belt guide are tight.
Auger Cable Spring
Auger
Bail
9. Check the operation. When you release the auger
bail, the auger must stop turning. When you engage
the auger bail, there MUST be clearance between the
brake arm and the auger drive pulley.
10. When you release the auger bail, the auger must stop
rotating. Make sure the brake contacts the auger
drive pulley (Figure 14) and that the auger cable
spring (Figure 13) has slack (no tension). If not, check
the cable spring adjustment as follows:
Jam Nut
Adjuster
Auger Cable
Figure 13
Idler Pulley
Idler
Spring
Idler Arm
Auger
Brake
Drive
Pulley
Idler Pulley
Nut
Engine Drive
Pulley
Belt Guide
Auger
Belt
Figure 14
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MAINTENANCE
HOW TO REPLACE THE SCRAPER BLADE
1. Remove the fasteners that secure the scraper blade
(Figure 15).
2. Install a new scraper blade and secure with the
fasteners removed in step 1.
Scraper Blade
Figure 15
HOW TO FREE THE AUGER CABLE
IMPORTANT: If the auger cable will not move when you
ENGAGE the bail, the auger cable could be frozen in-
side the conduit. DO NOT pull on the auger cable.
Instead, thaw the conduit and lubricate the auger
cable.
1. Thaw the conduit so the auger cable moves freely.
2. Work grease into the opening on the top of the conduit
where the auger cable enters.
Conduit
Figure 16
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MAINTENANCE
WARNING: To prevent accidental starting when
making any adjustments or repairs, always dis-
connect the spark plug wire and place it where
it cannot make contact with the spark plug .
HOW TO ADJUST THE CHUTE CRANK
Crank Adjusting
Bracket
Nut
If the chute crank will not rotate fully to the left or right, adjust
as follows.
Flange
1/8” (3mm)
1. Remove the top cover. See “How To Remove The Top
Cover”.
Worm Gear
2. Loosen the nuts.
3. Move the crank adjusting bracket to allow 1/8 inch
(3mm) clearance between the notch in the flange and
the outer diameter of the worm gear.
ure 17
4. Tighten the nuts.
HOW TO ADJUST THE AUGER CONTROL CABLE
The auger control cable is adjusted at the factory. During nor-
mal use, the auger control cable can become stretched and
the auger drive lever will not properly engage or disengage
the auger.
1. Remove the “Z” hook from the auger drive lever
(Figure 18).
2. Slide the cable boot off the cable adjustment bracket
Auger Drive
(Figure 19).
Lever
3. Push the bottom of the auger control cable through the
cable adjustment bracket until the “Z” hook can be re-
moved.
Z-Hook
4. Remove the “Z” hook from the cable adjustment brack-
et. Move the “Z” hook down to the next adjustment hole.
Figure 18
5. Pull the auger control cable up through the cable ad-
justment bracket.
6. Put the cable boot over the cable adjustment bracket.
7. Install the “Z” hook to the auger drive lever.
8. To check the adjustment, start the snow thrower. Make
sure the auger does not rotate when the auger drive lever
is released.
Auger Control Cable
Cable Boot
Z-Hook
Cable Adjustment
Bracket
Figure 19
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MAINTENANCE
HOW TO REPLACE THE DRIVE BELT
Belt Guide
Idler Pulley
Engine PUlley
The drive belt is of special construction and must be re-
placed with original factory replacement belt available from
your nearest authorized service center.
Drive Belt
1. Remove the belt cover. See “How To Remove The Belt
Cover”.
2. Remove the drive belt from the idler pulley. (See
Figure 20 and Figure 21)
Belt Guide
Figure 20
3. Remove the drive belt from the engine pulley. Be
careful, not to bend the belt guides.
4. Remove the drive belt from the auger pulley. (See
Figure 21)
Idler Pulley
5. Remove the old drive belt.
Engine
Pulley
6. To install the new drive belt, reverse the above steps.
7. Make sure the drive belt is seated properly on the pul-
Drive Belt
leys.
Auger Pulley
Figure 21
NOTE: When the auger control lever is engaged, the
belt guides must be 1/16” from the drive belt . (See
Figure 22)
Engine Pulley
Idler Pulley
8. Install belt cover. See “How To Remove The Belt Cov-
er”.
Drive Belt
Belt Guide
Figure 22
1/16 inch
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MAINTENANCE
HOW TO REPLACE THE AUGER
1. Remove the belt cover. See “How To Remove The Belt
Cover”.
5. Remove the fasteners from the bearing assembly. Re-
move the bearing assembly from the auger housing.
2. Remove the drive belt. See “How To Replace The Drive
Belt”.
6. Slide the auger out of the bearing assembly on the
right side of the snow thrower.
3. Remove the auger pulley from the auger shaft
(threads are left hand; turn clockwise to remove). (See
Figure 23).
7. Tip the auger enough to allow the auger to slide out of
the auger housing.
4. To keep the auger from rotating, set a 2”x4” piece of
wood on the center paddle to secure auger.
8. To install auger, reverse the above steps.
Wood
Auger Housing
Center Paddle
Auger
Bearing Assemlby
Auger Pulley
Figure 23
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MAINTENANCE
TO ADJUST THE CARBURETOR
The carburetor is not adjustable. Engine performance
should not be affected at altitudes up to 7,000 feet. For
operation at higher elevations, contact your nearest autho-
rized service center.
Fuel Cap
Shroud
IMPORTANT: Never tamper with the engine governor,
which is factory set for proper engine speed. Over-speed-
ing the engine above the factory high speed setting can be
dangerous. If the engine-governed high speed needs an
adjustment, contact an authorized service center. They
have the proper equipment and experience to make any
necessary adjustments.
TO ADJUST OR REPLACE THE SPARK PLUG
Check the spark plug every twenty-five (25) hours. Re-
place the spark plug if the electrodes are pitted or burned
or if the porcelain is cracked.
Figure 24
The spark plug is housed in the engine compartment under
the top cover and cannot be seen under normal condi-
tions.
Spark Plug
Wire
WARNING: STOP the engine. Wait for it to cool
before removal of spark plug.
Spark
Plug
CAUTION: DO NOT clean the plug with abrasives.
1. Remove the fuel cap (see Figure 24).
2. Remove the screws from the shroud. Remove the
shroud. Install the fuel cap.
3. Disconnect the spark plug wire (see Figure 25).
4. Clean the area around the spark plug base to prevent dirt
from entering the engine when the spark plug is re-
moved.
Figure 25
5. Remove the spark plug.
6. Check the spark plug. If the spark plug is cracked,
fouled or dirty, it must be replaced .
.030” (0.76 mm) Gap
7. Set the gap between the electrodes of the new spark
plug at 0.030 inch (Figure 26).
8. Install the spark plug in the cylinder head and firmly tight-
en. Recommended torque is 18 to 20 foot pounds. Attach
the spark plug wire.
9. Remove the fuel cap and install the shroud (see
Figure 24).
10. Install the fuel cap.
Figure 26
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STORAGE
5. Insure that all nuts, bolts, and screws are securely fas-
OFF SEASON STORAGE
tened. Inspect all visible moving parts for damage,
breakage, and wear. Replace if necessary.
WARNING: Never store the engine, with fuel in
the tank, indoors or in a poor ventilated enclo-
sure where fuel fumes could reach an open
flame, spark or pilot light as on a furnace, water heater,
clothes dryer, etc.
6. Touch up all rusted or chipped paint surfaces; sand lightly
before painting.
Handle gasoline carefully. It is highly flammable and
careless use could result In serious fire damage to your
person and /or property.
7. Cover the bare metal parts of the blower housing and au-
ger with rust preventative.
Drain fuel into approved containers outdoors, away
from open flame.
8. If possible, store your snowthrower indoors and cover it
to give protection from dust and dirt.
If the snowthrower is to be stored for thirty (30) days or more
at the end of the snow season, the following steps are
recommended to prepare your snowthrower for storage.
9. On models with folding handles, loosen the knobs that
secure the upper handle. Rotate the upper handle back.
NOTE: Gasoline must be removed or treated to prevent
gum deposits from forming in the tank, filter, hose, and
carburetor during storage.
10. If the machine must be stored outdoors, block up the s-
nowthrower and insure the entire machine is off the
ground. Cover the snowthrower with a heavy tarpaulin.
1. To remove gasoline, run engine until tank is empty and
engine stops.
REMOVING THE SNOWTHROWER FROM
STORAGE
When removing the snowthrower from storage, follow the
steps below.
If you do not want to remove the gasoline, add fuel stabilizer
to any gasoline left in the tank to minimize gum deposits and
acids. If the tank is almost empty, mix stabilizer with fresh
gasoline in a separate container and add some to the tank.
ALWAYS FOLLOW INSTRUCTIONS ON STABILIZER
CONTAINER. THEN RUN ENGINE AT LEAST 10 MINUTES
AFTER STABILIZER IS ADDED TO ALLOW MIXTURE TO
REACH CARBURETOR. STORE SNOWTHROWER IN
SAFE PLACE.
1. Put the upper handle in the operating position, tighten the
knobs that secure the upper handle.
2. Fill the fuel tank with a fresh fuel-oil mixture. See “How
to Mix The Fuel Mixture” in the Operation section.
2. Lubricating the piston/cylinder area. This can be done by
first removing the spark plug and squirting clean engine
oil into the spark plug hole. Then cover the spark plug
hole with a rag to absorb oil spray. Next, rotate the engine
by pulling the starter two or three times. Finally, reinstall
spark plug and attach spark plug wire.
3. Lubricate the auger bail and idler arm.
4. Check the spark plug. Make sure the gap is correct. If the
spark plug is worn or damaged, replace before using.
5. Make sure all fasteners are tight.
3. Thoroughly clean the snowthrower.
6. Make sure all guards, shields, and covers are in place.
7. Make sure all adjustments are correct.
4. Lubricate all lubrication points (see “Lubrication“ in the
Service Recommendations section).
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TROUBLE SHOOTING CHART
PROBLEM
LOOK FOR
REMEDY
Difficult starting
Defective spark plug.
Replace defective spark plug.
Clean fuel line.
Engine runs erratically Blocked fuel line.
Empty gas tank.
Check fuel supply,
Add fresh gasoline.
Stale gasoline.
Water or dirt in fuel system.
Remove carburetor bowl to drain fuel tank. Refill
with fresh fuel. CAUTION: Do not remove
carburetor bowl when the engine is hot.
Engine stalls
Loss of power
Unit running on CHOKE.
Set choke lever to RUN position.
Gas cap vent hole is plugged.
Remove ice and snow from cap. Be sure vent
hole is clear.
Excessive vibration
Loose parts.
Stop engine immediately and remove spark plug
wire. Tighten all bolts and make all necessary
repairs. If vibration continues, have the unit
serviced by a competent repairman.
Unit fails to propel
itself
Drive belt loose or damaged.
Replace drive belt. Refer to Drive Belt
Replacement in the Maintenance section of this
manual.
Incorrect adjustment of traction drive
cable.
Adjust traction drive cable. Refer to Cable
Adjustment in the Maintenance section of this
manual.
Unit fails to discharge
snow
Auger drive belt loose or damaged.
Replace or adjust auger drive belt. Refer to Drive
Belt Replacement and Drive Belt Adjustment in
the Maintenance section of this manual.
Auger control cable not adjusted
correctly.
Adjust auger control cable. Refer to Cable
Adjustment in the Maintenance section of this
manual.
Discharge chute clogged.
Stop engine immediately and disconnect spark
plug wire. Refer to the first Warning in
Snowthrower Operation in the Operation
section of this manual. Clean discharge chute
and inside of auger housing.
Foreign object lodged in auger.
Stop engine immediately and disconnect spark
plug wire. Remove object from auger housing.
Identifying Your Snowthrower
Your new snowthrower has two (2) identifying numbers: (1) unit model number: (2) unit serial number. The two preceding
numbers are required to insure that the proper replacement parts are obtained when required. If you have any questions
concerning parts, service, or technical data, contact your nearest John Deere/Frontier dealer.
For complete warranty information refer to the warranty in the Owner’s Information section of this manual.
25
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NOTES
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REPLACEMENT PARTS
WE RECOMMEND JOHN DEERE/FRONTIER quality parts and lubricants available at your John Deere/Frontier dealer.
PART NUMBERS MAY CHANGE. When you order replacement parts, use the part numbers listed below and on the fol-
lowing pages. If a part number changes, your John Deere/Frontier dealer will have the latest part number.
WHEN YOU ORDER PARTS, your John Deere/Frontier dealer must have your snowthrower model and serial number and
your engine model number. This is the model and serial number that you recorded in the “Owner’s Information” section of
this Owner’s Manual.
QUICK REFERENCE PART NUMBERS
The following is a list of replacement parts that you may need for routine service and maintenance. If you do not see the
replacement part you need in the following chart, then check the full list of replacement part illustrations following this
page.
ITEM
PART NUMBER *
MT37x130
Belt
Scraper Blade
Spark Plug
MT302418
Champion RCJ8Y
* Part Numbers are subject to change without notice.
27
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FRONTIER MODEL ST0521M FACTORY MODEL 621501x16NA
FRONTIER MODEL ST0521E FACTORY MODEL 621500x16NA
ENGINE ASSEMBLY
10
11
9
14
12
13
1
7
15
6
16
5
4
3
17
18
19
2
20
7
21
26
23
28
24
22
25
29
27
28
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FRONTIER MODEL ST0521M FACTORY MODEL 621501x16NA
FRONTIER MODEL ST0521E FACTORY MODEL 621500x16NA
ENGINE ASSEMBLY
Key No.
Part No.
Description
1
MT760632
MT760631
ENGINE, RECOIL START
ENGINE, ELECTRIC START
2
MT340381E701
MT313780
MT301419E701
MT301415E701
MT71391
AUGER HOUSING, 21”
SCREW, .31-18x .5
SUPPORT, FRAME
SUPPORT, ENGINE
NUT.31-18 HEX
3
4
5
6
7
MT71391
NUT .31-18 HEX
9
MT314135
MT314142
MT316001
MT73826
HANDLE, UPPER
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
COVER, CABLE SPRING
CABLE, DRIVE
LOCKNUT .25-20 HEX
WASHER .286-0.62-.07
SCREW .25-20x1.50
WASHER .318-0.56-.05
SCREW, .31-18x .63
PLATE, REAR
MT71067
MT70971
MT71060
MT313676
MT301421
MT45892
BOLT, CARRIAGE .38-16x1.50
SPRING, IDLER BRAKE
PULLEY, 4.5 HP
MT339017
MT333784
MT333805
MT71391
BOLT, SHOULDER .625x.280
NUT.31-18 HEX
MT120386
MT340428
MT590
WASHER, FLAT .312X .73X.065
GUIDE, BELT
JAM NUT.38-16 HEX
PULLEY, IDLER
MT48924
MT37x130
MT333594
BELT, POLY-V 10 RIB 35.14
BOLT, SHOULDER
29
--
MT339415
BRACKET, IDLER ARM
OWNER’S MANUAL
MTF-031039C
29
MTF-031039C
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FRONTIER MODEL ST0521M FACTORY MODEL 621501x16NA
FRONTIER MODEL ST0521E FACTORY MODEL 621500x16NA
FRAME ASSEMBLY
12
13
10
9
11
15
19
20
15
16
14
8
11
7
18
17
2
6
21
17
22
5
4
18
3
2
23
1
24
5
11
25
25
11
25
11
26
25
11
30
MTF-031039C
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FRONTIER MODEL ST0521M FACTORY MODEL 621501x16NA
FRONTIER MODEL ST0521E FACTORY MODEL 621500x16NA
FRAME ASSEMBLY
Key No.
Part No.
Description
1
MT340381E701
AUGER HOUSING 21”
2
MT323387
MT323395
MT56679
CLAMP, TUBING
3
TUBING, FUEL
4
FILTER, FUEL
5
MT313780
MT323363
MT47345
SCREW .31-18x.50
TUBING, FUEL
6
7
CLAMP, TUBING
8
MT326142
MT327018
MT311671
MT309814
MT308677
MT997316
MT274707
MT318139
MT301420E701
MT71391
FUEL TANK
9
CAP, FUEL
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
CLAMP, WORM DR
SCREW 10-24x.62
BRACKET, FUEL TANK
NUT, LOCK 10-24
SCREW 10-24x.50
SCREW .25-20x.62
PLATE, REAR MT RH
NUT, LOCK .31-18
SCREW .31-18x.75
FRAME SUPPORT
HEAT SHIELD
MT313676
MT301419E701
MT311738E701
MT760631
MT301421E701
MT302635
MT303041
MT590
ENGINE w/ELECTRIC START
PLATE, REAR MT LH
NUT, LOCK .25-20
WASHER, FLAT
NUT.38-16 HEX JAM CTRLK
BOTTOM SHROUD
MT305869
31
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FRONTIER MODEL ST0521M FACTORY MODEL 621501x16NA
FRONTIER MODEL ST0521E FACTORY MODEL 621500x16NA
HANDLE ASSEMBLY
3
5
1
4
6
7
8
6
18
17
16
9
10
4
15
11
14
15
9
12
17
15
14
15
13
Key No. Part No.
Description
Key No. Part No.
Description
1
MT307747
MT309815
MT329935
MT308716
MT311936
MT314135
MT308715
MT337584
MT310169
DRIVEBAR
11
12
13
14
15
16
17
18
MT71055
NUT, LOCK 10-24
PLATE, REAR MT LH
FRAME SUPPORT
NUT, LOCK .31-18
WASHER, LOCK
3
SCREW 10-24x1.00
KNOB
MT301421E701
MT301419E701
MT71391
4
5
BRACKET, UPPER CRANK
WASHER, FORMED
HANDLE, UPPER w/FOAM
BRACKET, LOWER CRANK
BOLT, FORMED HEAD
SCREW .25-20x.62
6
MT71060
7
MT301420E701
MT313676
PLATE, REAR MT RH
SCREW .31-18x.75
LOWER HANDLE
8
9
MT309964E701
10
32
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FRONTIER MODEL ST0521M FACTORY MODEL 621501x16NA
FRONTIER MODEL ST0521E FACTORY MODEL 621500x16NA
AUGER HOUSING
6
1
2
3
1
1
4
5
3
5
2
7
9
8
4
12
10
11
Key No. Part No.
Description
1
2
MT579052
MT71067
SCREW .25-20X.63
WASHER, FLAT .281x.63x.065
PLATE, BEARING RETAINER
PLATE & BEARING ASSY
NUT, LOCK .25-20
3
MT54836
4
MT583459
MT73826
5
6
MT340381E701
MT578101
MT40677
AUGER HOUSING 21”
SPACER, SLEEVE
7
8
WASHER, FLAT .640x1.25x.06
PULLEY, POLY V
9
MT333446
MT302418
MT302635
MT321961E701
10
11
12
SCRAPER BLADE
NUT, LOCK .25-20
AUGER ASSY
33
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FRONTIER MODEL ST0521M FACTORY MODEL 621501x16NA
FRONTIER MODEL ST0521E FACTORY MODEL 621500x16NA
DISCHARGE CHUTE
15
18
16
19
20
21
17
16
6
13
5
22
23
14
24
28
8
9
25
25
6
7
24
26
7
12
6
11
5
27
29
10
1
2
3
4
3
2
1
30
34
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FRONTIER MODEL ST0521M FACTORY MODEL 621501x16NA
FRONTIER MODEL ST0521E FACTORY MODEL 621500x16NA
DISCHARGE CHUTE
Key No.
Part No.
Description
1
MT15X144
NUT.31-18 HEX
2
MT71060
WASHER, LOCK
3
MT71071
WASHER, FLAT .349-0.69-.07
BRKT, WORM ADJUST
PIN, COTTER.094x0.75L
WASHER, FLAT .400-0.75-.02
WASHER, SPRING .395-0.73-.01
BOLT-CARRIAGE .31-18x0.75
BRKT, CHUTE ROD HOLE
SCREW.25-20x0.50 HHC
PLATE, CHUTE ROD
4
MT302505E701
MT71081
5
6
MT12452
7
MT313431
MT340720
MT300728E701
MT313686
MT307741
MT73826
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
NUT, LOCK.25-20 HEX
BLOCK, PIVOT CHUTE
ROD ASSEMBLY, LOWER CHUTE
NUT, LOCK .31-18 HEX
WASHER, FLAT .349-0.69-.07
SCREW.31-18x0.75
MT51564
MT307742
MT71391
MT71071
MT578088
MT305861
MT310562
MT57171
CHUTE, UPPER
WIRE FORM, HINGE
WINGKNOB
MT15X144
MT302843
MT305862
MT313686
MT15X143
MT56962
NUT.31-18 HEX
BOLT-CARRIAGE .31-18x1.50
CHUTE, LOWER
SCREW.25-20x0.50
NUT, FLANGED LOCK .25-20
SCREW.25-14x0.62
MT307842
MT300790
MT340720
MT340381E701
CHUTE RING
CLIP, CHUTE RING
BOLT-CARRIAGE .31-18x0.75
AUGER HSG, 21”
35
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FRONTIER MODEL ST0521M FACTORY MODEL 621501x16NA
FRONTIER MODEL ST0521E FACTORY MODEL 621500x16NA
TOP COVER ASSEMBLY
10
18
9
15
17
16
14
8
13
12
5
7
6
11
5
19
20
24
20
4
3
20
19
23
22
2
1
26
25
36
MTF-031039C
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FRONTIER MODEL ST0521M FACTORY MODEL 621501x16NA
FRONTIER MODEL ST0521E FACTORY MODEL 621500x16NA
TOP COVER ASSEMBLY
Key No.
Part No.
Description
1
MT309813
SCREW 10-14x.63
2
MT711666
MT71055
WASHER, FLAT
3
NUT, LOCK 10-24
WASHER, FLAT
4
MT303041
MT309811
MT12342
5
NUT, U TYPE
6
SCREW 10-24x.50
BRACKET, ACCESS COVER
COVER, ENGINE ACCESS
SCREW 10-16x.62
SCREW 10-16x.75
INGNITION SWITCH
WASHER, INTERNAL LOCK
NUT, .62-32 PLASTIC
BOOT, SWITCH
7
MT312102
MT305871
MT312094
MT312362
MT56992
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
MT313683
MT300193
MT300194
MT49643
KEYS & RING
MT54601
PRIMER BULB
MT57587
GROMMET & WASHER
KNOB, STANDARD T
HOSE, PRIMER
MT333643
MT1259
MT309814
MT303008
MT313057
MT397761
MT309964E701
MT310798
MT302416
SCREW 10-24x.63
NUT .25-20 KEPS
S CLIP
BRACKET, SHROUD MTG
LOWER HANDLE
SCREW 10-24x.38
COVER, BELT
37
MTF-031039C
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FRONTIER MODEL ST0521M FACTORY MODEL 621501x16NA
FRONTIER MODEL ST0521E FACTORY MODEL 621500x16NA
WHEEL ASSEMBLY
7
2
6
1
2
3
4
5
2
4
2
1
3
Key No. Part No.
Description
1
2
3
4
5
6
7
MT577598
MT71072
RING, RET. E
WASHER, FLAT .406x.81x.07
7.75”X1.75” WHEEL
SPACER, SLEEVE
MT1501741
MT309656
MT307719
AXLE SHAFT
MT301421E701
MT301420E701
PLATE, REAR MT LH
PLATE, REAR MT RH
38
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FRONTIER MODEL ST0521M FACTORY MODEL 621501x16NA
FRONTIER MODEL ST0521E FACTORY MODEL 621500x16NA
CHUTE ROD ASSEMBLY
9
8
7
6
10
1
5
2
3
4
Key No. Part No.
Description
1
2
MT331532
MT307755
MT12452
MT71081
MT307742
MT51564
MT307756
MT314159
MT314158
MT309449
PUSH NUT
KNOB, GRIP
3
WASHER, FLAT .400x.75x.02
PIN, COTTER
4
5
ROD, CHUTE CNTRL LWR
BLOCK, PIVOT
6
7
ROD, CHUTE CNTRL MID
NUT, LOCK 10-32
SCREW, 10-32X.88
ROD, CHUTE UPPER
8
9
10
39
MTF-031039C
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FRONTIER MODEL ST0521M FACTORY MODEL 621501x16NA
FRONTIER MODEL ST0521E FACTORY MODEL 621500x16NA
DECALS
2
3
4
5
1
7
6
Key No. Part No.
Description
1
2
3
4
MT48x5262
MT48x2034
MT337524
DECAL, DANGER AUGER
DECAL, DANGER CHUTE
DECAL, AUGER CONTROL
MT340709
MT340708
DECAL, CONTROL PANEL ST0521E (621500x16NA)
DECAL, CONTROL PANEL ST0521M (621501x16NA)
5
6
7
*
MT69880
DECAL, HOT MUFFLER
DECAL, FRONTIER ST0521
DECAL, EPA
MT48x5260
MT48x5202
MTF-031039C
OPERATOR’S MANUAL
* Not Illustrated
40
MTF-031039C
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FRONTIER MODEL ST0521E FACTORY MODEL 621500x16NA
ELECTRIC STARTER
Ref. Hardware
(Bolts)
1
Ref. Electric
Starter
2
6
Ref. Engine
Ref. Top Cover
4
3
5
Key No. Part No.
Description
1
2
3
4
5
6
NA
INCLUDED WITH ENGINE
NUT, KEPS 8-32
WASHER, FLAT
MT271163
MT414106
MT311633
MT56023
MT57569
SCREW 8-32x3.00
CORD, EXTENSION
RETAINER
41
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NOTES
42
MTF-031039C
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NOTES
43
MTF-031039C
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SPECIFICATIONS ST0521M, ST0521E
Engine
Tecumseh Snow King 2-Cycle
5 hp
Horsepower
Starter
ST0521M Recoil
ST0521E Electric
Fuel Capacity
Drive System
Tire Diameter
Clearing Width
Housing Height
Auger Diameter
Auger Type
1.5 quart
Auger
7”
21”
12”
9”
Rubber-edged
Remote
190_
Chute Rotation
Chute Turning Radius
Deflector Control
Weight
Manual
ST0521M 89 lbs
ST0521E 93 lbs
Warranty - Engine
Warranty - Machine
2 years
3 years
44
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