Troybilt 521 User Manual VARIFLEX 12 SCOOTER Manuals And Guides L0404066

TROYBILT Snowthrower, Gas Manual L0404066 TROYBILT Snowthrower, Gas Owner's Manual, TROYBILT Snowthrower, Gas installation guides

User Manual: Troybilt 521 521 VARIFLEX 12 SCOOTER - Manuals and Guides View the owners manual for your VARIFLEX 12 SCOOTER #521. Home:Sports & Leisure Parts:Vari-Flex Parts:Vari-Flex 12 SCOOTER Manual

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0 TP D RILT°
Operator's Manual

Single Stage
Snow Thrower
Models 521 & 721

IMPORTANT:

Read safety rules and instructions carefully

before operating

equipment.

Warning:

This unit is equipped with an internal combustion engine and should not be used on or near any unimproved forestcovered, brush-covered or grass-covered land unless the engine's exhaust system is equipped with a spark arrester meeting
applicable local or state laws (if any). If a spark arrester is used, it should be maintained in effective working order by the operator.
In the State of California the above is required by law (Section 4442 of the California Public Resources Code). Other states may have
similar laws. Federal laws apply on federal lands. A spark arrester for the muffler is available through you r nearest engine authorized
service dealer or contact the service department,

TROY-BILT
PRINTED IN U.S.A.

P.O. Box 361131 Cleveland, Ohio 44136-0019.

LLC. P.O. BOX 361131 CLEVELAND,

OHIO 44136-0019
FORM NO. 769-00309
(8/2002)

TABLEOFCONTENTS
Content

Page

Important Safe Operation Practices ..................................................................................

Assembling Your Snow Thrower .......................................................................................

Know Your Snow Thrower .................................................................................................

Operating Your Snow Thrower ..........................................................................................

Making Adjustments ..........................................................................................................

Maintaining Your Snow Thrower .......................................................................................

Off-Season Storage ..........................................................................................................

Troubleshooting

................................................................................................................

Parts List ..........................................................................................................................

FINDINGMODELNUMBER
This Operator's Manual is an important part of your new snow thrower. It will help you to assemble, prepare and
maintain the unit for best performance. Please read and understand what it says.
Before you start assembling your new snow thrower, please locate the model plate on the
equipment and copy the information from it in the space provided below. The information on the
model plate is very important if you need help from our Customer Support Department or an
authorized dealer.
You can locate the model number by standing behind the unit in the operating position and looking down at
the dash panel. A sample model plate is explained below. For future reference, please copy the model
number and the serial number of the equipment in the space below.

Copy the model number here:

•

D BH.T.

TROY-BILT
LLI
P. O. BOX 361131

www.troybiJt.com

CLEVELAND,
OH44136

Copy the serial number here:

330-558-7220
866-840-6483

ENGINEINFORMATION
The engine manufacturer is responsible for all engine-related issues with regards to performance, power-rating,
specifications, warranty and service. Please refer to the engine manufacturer's Owner's/Operator's Manual packed
separately with your unit for more information.

CALLINGCUSTOMER
SUPPORT
Please do NOT returnthe unit tothe retailer from whichit waspurchased,withoutfirst contactingCustomerSupport.
If you have difficulty assembling this product or have any questions regarding the controls, operation or
maintenance of this unit, please call 1-866-840-6483 or 1-330-558-7220 to reach a Customer Support
representative. Please have your unit's model number and serial number ready when you call. See
previous section to locate this information. You will be asked to enter the serial number in order to
process your call.

SECTION1: IMPORTANT
SAFEOPERATION
PRACTICES
WARNING:

This symbol points out important safety instructions which, if not followed, could endanger

the personal safety and/or property of yourself and others. Read and follow all instructions in this manual
before attempting to operate this machine. Failure to comply with these instructions may result in personal
injury. When you see this symbol--heed its warning.

WARNING:
Engine
Exhaust,
some of
constituents,
andbirth
certain
vehicle
components
contain
or emit
chemicals
known
to State
of California
to its
cause
cancer and
defects
or other
reproductive
harm.

DANGER: This machine was built to be operated according to the rules for safe operation in this manual. As with any type
of power equipment, carelessness or error on the part of the operator can result in serious injury. This machine is capable
of amputating hands and feet and throwing objects. Failure to observe the following safety instructions could result in
serious injury or death.

Training
1.

4.
5.

Read, understand, and follow all instructions on the
machine and in the manual(s) before attempting to
assemble and operate. Keep this manual in a safe place
for future and regular reference and for ordering
replacement parts.
Be familiar with all controls and their proper operation.
Know how to stop the machine and disengage them
quickly.
Never allow children under 14 years old to operate this
machine. Children 14 years old and over should read and
understand the operation instructions and safety rules in
this manual and should be trained and supervised by a
parent.
Never allow adults to operate this machine without
proper instruction.
Thrown objects can cause serious personal injury. Plan
your snow throwing pattern to avoid discharge of material
toward roads, bystanders and the like.
Keep bystanders, helpers, pets and children at least 75
feet from the machine while it is in operation. Stop
machine if anyone enters the area.
Exercise caution to avoid slipping or falling, especially
when operating in reverse.

Preparation
1.

4.
5.

Thoroughly inspect the area where the equipment is to
be used. Remove all door mats, newspapers, sleds,
boards, wires and other objects which could be tripped
over or thrown by the auger/impeller.
Always wear safety glasses or eye shields during
operation and while performing an adjustment or repair to
protect your eyes. Thrown objects which ricochet can
cause serious injury to the eyes.
Do not operate without wearing adequate winter outer
garments. Do not wear jewelry, long scarves or other
loose clothing which could become entangled in moving
parts. Wear footwear which will improve footing on
slippery surfaces.
Use a grounded three wire extension cord and receptacle
for all units with electric start engines.
Adjust collector housing height to clear gravel or crushed
rock surfaces.

Disengage all clutch levers before starting the engine.
Never attempt to make any adjustments while engine is
running, except where specifically recommended in the
operator's manual.
Let engine and machine adjust to outdoor temperature
before starting to clear snow.
To avoid personal injury or property damage use extreme
care in handling gasoline. Gasoline is extremely
flammable and the vapors are explosive. Serious
personal injury can occur when gasoline is spilled on
yourself or your clothes which can ignite. Wash your skin
and change clothes immediately.
a. Use only an approved gasoline container.
b. Extinguish all cigarettes, cigars, pipes and other
sources of ignition.
c. Never fuel machine indoors.
d. Never remove gas cap or add fuel while the
engine is hot or running.
e. Allow engine to cool at least two minutes before
refueling.
f.
Never over fill fuel tank. Fill tank to no more than
Y2inch below bottom of filler neck to provide space
for fuel expansion.
g. Replace gasoline cap and tighten securely.
h. If gasoline is spilled, wipe it off the engine and
equipment. Move machine to another area. Wait 5
minutes before starting the engine.
i.
Never store the machine or fuel container inside
where there is an open flame, spark or pilot light
(e.g. furnace, water heater, space heater, clothes
dryer etc.).
j.
Allow machine to cool at least 5 minutes before
storing.

Operation
1.

Do not put hands or feet near rotating parts, in the auger/
impeller housing or discharge chute. Contact with
rotating parts can amputate hands and feet.
The auger/impeller clutch lever is a safety device. Never
bypass its operation. Doing so, makes the machine
unsafe and may cause personal injury.
The clutch levers must operate easily in both directions
and automatically return to the disengaged position when
released.

4. Never
operate
witha missing
ordamaged
discharge
Maintenance& Storage
chute.Keepallsafety
devices
inplaceandworking.
1. Never tamper with safety devices. Check their proper
5. Never
runanengine
indoors
orinapoorly
ventilated
operation regularly.
area.Engine
exhaust
contains
carbon
monoxide,
an
2. Disengage all clutch levers and stop engine. Wait until
odorless
anddeadly
gas.
the auger/impeller come to a complete stop. Disconnect
6. Donotoperate
machine
whileundertheinfluence
of
the spark plug wire and ground against the engine to
alcohol
ordrugs.
prevent unintended starting before cleaning, repairing, or
7. Muffler
andengine
become
hotandcancause
aburn.Do
inspecting.
nottouch.
3.
Check bolts, and screws for proper tightness at frequent
8. Exercise
extreme
caution
whenoperating
onorcrossing
intervals to keep the machine in safe working condition.
gravelsurfaces.
Stayalertforhidden
hazards
ortraffic.
Also, visually inspect machine for any damage.
9. Exercise
caution
whenchanging
direction
andwhile
4. Do not change the engine governor setting or over-speed
operating
onslopes.
the engine. The governor controls the maximum safe
10. Planyoursnowthrowing
pattern
toavoiddischarge
operating speed of the engine.
towards
windows,
walls,carsetc.Toavoidproperty
5. Snow thrower shave plates and skid shoes are subject to
damage
orpersonal
injurycaused
byaricochet.
wear and damage. For your safety protection, frequently
11. Never
directdischarge
atchildren,
bystanders
andpets
check all components and replace with original
orallowanyone
infrontofthemachine.
equipment manufacturer's (Q.E.M.) parts only. "Use of
12. Donotoverload
machine
capacity
byattempting
toclear
snowattoofastofa rate.
parts which do not meet the original equipment
specifications may lead to improper performance and
13. Never
operate
thismachine
without
goodvisibility
or
compromise safety!"
light.Always
besureofyourfooting
andkeepafirmhold
6. Check clutch controls periodically to verify they engage
onthehandles.
Walk,neverrun.
and disengage properly and adjust, if necessary. Refer to
14. Disengage
power
totheauger/impeller
when
the adjustment section in this operator's manual for
transporting
ornotinuse.
instructions.
15. Never
operate
machine
athightransport
speeds
on
7. Maintain or replace safety and instruction labels, as
slippery
surfaces.
Lookdownandbehind
andusecare
wheninreverse.
necessary.
16. Ifthemachine
should
starttovibrate
abnormally,
stopthe 8. Observe proper disposal laws and regulations for gas,
oil, etc. to protect the environment.
engine,
disconnect
thesparkplugandground
itagainst
9. Prior to storing, run machine a few minutes to clear snow
theengine.
Inspect
thoroughly
fordamage.
Repair
any
from machine and prevent freeze up of auger/impeller.
damage
before
starting
andoperating.
10. Never store the machine or fuel container inside where
17. Disengage
allclutch
levers
andstopengine
before
you
there is an open flame, spark or pilot light such as a water
leavetheoperating
position
(behind
thehandles).
Wait
heater, furnace ,clothes dryer etc.
untiltheauger/impeller
comes
toacomplete
stopbefore
11. Always refer to the operator's manual for proper
unclogging
thedischarge
chute,
making
any
instructions on off-season storage.
adjustments,
orinspections.
18. Never
putyourhandinthedischarge
orcollector
openings.
Always
useaclearing
tooltounclog
the
YourResponsibility:
discharge
opening.
19. Useonlyattachments
andaccessories
approved
bythe
•
Restrict the use of this power machine to persons
manufacturer
(e.g.wheelweights,
tirechains,
cabsetc.).
who read, understand
and follow the warnings and
20. Ifsituations
occurwhicharenotcovered
inthismanual,
instructions
in this manual and on the machine.
usecareandgoodjudgment.
Contact
yourdealer
or
telephone
1-800-800-7310
forassistance
andthename
ofyournearest
servicing
dealer.

SECTION2: ASSEMBLING
YOURSNOWTHROWER
UnpackingFromCarton
•
•
•

Cut along corners of the carton and lay it down flat.
Remove packing material.
Remove any loose parts included with unit (i.e.,
operator's manual, etc.).
Roll unit out of carton. Check carton thoroughly for
any remaining loose part.

•

Remove the hairpin clip from the end of the lower
chute crank.

•

Insert the upper chute crank into the lower chute
crank and align the holes.
Re-insert the hairpin clip into the hole to secure the
two chute cranks. See Figure 2.

•

ItemsRequiredForAssembly
1.
2.
3.

Pair of pliers
Engine oil
Fresh gasoline

NOTE: All references to left or right side of the snow
thrower is from the operating position only.

Hairpin

BeforeAssembly
and ground it against
WARNING:
Disconnect
the engine
the spark
to prevent
plug wire
unintended starting. See Figure 1.

_IOTE: For dadty
of viewing, the
control handle is
removed from the
picture. Do not
remove it for the task..

RaisingUpperHandle
•

Loosen the hand knob on each side of the handle.
Remove packing material, if any.

Figure 2

AttachingControlCable
The control cable may already be attached to the
control handle. If not attached, complete the following
steps to attach it to the snow thrower housing.
•
Route the control cable over the lower handle.
Insert the end of the cable into the hole in the

Hand Knob

control housing as shown in Figure 3. Push the
plastic fitting until it locks into the control housing.

Spark Plug
Access

Hole
Control
Handle

of Cable
End

Figure 1
•

•

Raise the upper handle in the direction shown in
Figure 1 until it clicks into the operating position.
Make sure not to pinch or crimp the cable.
Tighten the hand knobs.

Housing

Fitting

Figure 3

AttachingChuteCrank
The lower chute crank is already attached to your snow
thrower at the factory. For shipping purposes, the upper
chute crank is packaged as loose part. Attach it to the
lower chute crank following instructions:

Lift the control handle up, and hook the "Z" end of
the control cable into the bottom hole in the control
handle, from the outside to the inside. If necessary,
pull up on the end of the cable with a pair of pliers to
obtain slack in order to hook it into the control

handle.Holdthe"Z"fittingwiththepliers,notthe
cable,toavoiddamaging
thecable.
NOTE:The upper hole in the control handle provides

Lower Chute
\
\

Nut

Bolt

for adjustment in belt tension. Refer to page 9 of this
manual for instructions.

Flat
_
Washer f

Flat

AssemblingDischargeChute
•
•
•

Turn the chute crank until the chute faces straight
to the front. See Figure 4.
Remove the hand knob, flat washer and carriage
bolt from the upper chute. See Figure 4.
Pivot the upper chute up and over the lip of the
lower chute. This will eliminate any gap between
the upper and the lower chutes. Secure with
hardware just removed.

Upper j
Chute

Hand
Knob

Figure 4

SECTION3: KNOWYOURSNOWTHROWER
,_

WARNING:
Be and
familiar
with all them
the controls
stop
the machine
disengage
quickly.on the snow thrower and their proper operation. Know how to

Handle
Starter

Starter
Spark

_il

Plug Access

Fill Plug

Lever

Auger _
Shave Plate

Figure 5
Auger ControlHandle
Located on the upper handle, the auger control handle
is used to engage and disengage the auger. The snow
thrower is designed to propell by the rotation of the
auger. Pull the control handle back against the upper
handle to engage the auger; release to disengage.

ChuteCrank
Located on right side of dash panel, the chute crank
determines the direction that snow will be discharged.
Turn clockwise to discharge snow to the left; turn
counterclockwise to discharge to the right.

DischargeChute

IgnitionKey

The angle of the discharge chute controls the distance
that the snow is thrown. Tilt the discharge chute up for
greater distance; tilt down for less distance. Loosen the
hand knob on the side of the discharge chute to adjust.
Tilt the chute to the desired position, and tighten the
knob.

Used to start engine. Put key in "ON" position to start
for both electric and recoil start engines. Follow starting
instructions given in the next section.
RecoilStarter
Used to manually start the engine.
Electric Starter

ChokeLever
The location of the choke lever is indicated in Figure 5
inset. You will have to use this lever to start the engine.
Push the lever all the way up to the FULL/ON position,
or all the way down to the OFF position as desired.
PrimerButton
Used to inject fuel directly into the carburetor to insure
fast starts in cold weather. Follow engine manual to
prime engine.

Used to start engine with a 120V power source
Plug for Electric Start
Requires use of a three-prong outdoor extension cord
and a 120V power source
Spark PlugAccess
Spark plug located under the access cover.

SECTION4: OPERATING
YOURSNOWTHROWER
BeforeStarting
FPress
auger
control handle

WARNING:
instructions andRead,
warnings
understand,
on the machine
and follow
andall
in this manual before operating.
•

to engage
auger

The spark plug wire was disconnected for safety.
Attach spark plug wire to spark plug before starting,

Turn handle
to change
discharge
direction

GasandOilFill-Up
•

Check oil and gasoline level and add if necessary.
Follow related instructions in the seperate engine
manual packed with your snow thrower.

WARNING:

handling gasoline. Gasoline is extremely
flammable and the vapors are explosive. Never
fuel the machine indoors or while the engine is
hot or running. Extinguish cigarettes, cigars,
pipes and other sources of ignition.

Access

Figure 6

ToStartEngine

•

•
•

•

ElectricStarter

WARNING:

The electric starter must be

used with a properly grounded three-prong
receptacle at all times to avoid the possibility of
electric shock. Follow all instructions carefully
prior to operating the electric starter.

Starter

_Electric
Starter
Lever

Use extreme care when

Insert ignition key into slot. Turn key to ON position.
Now follow the instructions below as it pertains to
your unit. See Figure 6 for location of controls.

_Recoil

•

The electric starter is equipped with a grounded
three-wire power cord and plug, and is designed to
operate on 120 volt AC household current.
Determine that your house wiring is a three-wire
grounded system. Ask a licensed electrician if you
are not certain.
If your home wiring system is net a three-wire
grounded system, do not use this electric starter
under any conditions.
If your home electrical system is grounded, but
a three-hole receptacle is not available, one should
be installed by a licensed electrician before using
the electric starter.

•
•
•

•

If you have a grounded three-prong receptacle,
proceed as follows.
Rotate choke lever to FULL position.
Connect power cord to switch box on dash panel.
Plug the other end of power cord into a three-prong
120-volt, grounded, AC receptacle.
Push starter button to crank engine. As you crank
the engine, move choke lever to FULL choke
position.
When engine starts, release starter button, and
move choke gradually to OFF. If engine falters,
move choke immediately to FULL and then
gradually to OFF.
When disconnecting the power cord, always unplug
from the three-prong receptacle first, and then from
the snow thrower.

RecoilStarter
•
•
•
•

Move choke lever to FULL choke position (cold
engine start).
If engine is warm, place choke in OFF position
instead of FULL.
Push primer button two or three times for cold
engine start.
If engine is warm, push primer button only once.

•

•
•

•

Upper
Discharge
Chute

Knob
Hand

As engine warms up and begins to operate evenly,
rotate choke lever slowly to OFF position. If engine
falters, return to FULL choke, then slowly move to
OFF position.

To stop engine, turn ignition key counter-clockwise.
Disconnect the spark plug wire from the spark plug
to prevent accidental starting while equipment is
unattended.

Figure 7

OperatingTips
•
•

To help prevent possible freeze-up of starter,
proceed as follows:
•
•

Adjust the upper discharge chute up or down as
shown in Figure 7. You will have to loosen the hand
knob to adjust the upper chute, and then retighten
after correct adjustment is reached.
Use the chute crank to position the discharge chute
in order to discharge snow with the wind.
After making sure no bystanders or obstacles are in
front of the unit, engage the auger control handle.
As the snow thrower starts to move, maintain a firm
hold on the handle, and guide the snow thrower
along the path to be cleared.
Release the auger control handle to stop the snow
throwing action and the forward motion.

Grasp starter handle and pull rope out slowly, until
it pulls slightly harder. Let rope rewind slowly.
Pull starter handle rapidly. Do not allow handle to
snap back. Allow it to rewind slowly while keeping a
firm hold on the starter handle.

ToStopEngine
•

throttle control lever in the STOP or OFF position.
Leave choke control in the FULL choke position.
Remove ignitionkey and disconnect spark plug
wire to prevent accidental starting.

Operatingthe SnowThrower

NOTE: Always cover vent hole in primer button when
pushing. Additional priming may be necessary for first
start if temperature is below 15 degrees Fahrenheit.
•

or four times. Pulling the starter rope will produce a
loud clattering sound, which is not harmful to the
engine or starter.
Wipe all snow and moisture from the carburetor
cover in the area of the control levers. Also, move
control levers back and forth several times. Leave

Run engine for a few minutes before stopping to
help dry off any moisture on the engine.
Electric Starter: Connect power cord to switch box
on engine, then to 120 volt AC receptacle, With the
engine running, push starter button and spin the
starter for several seconds. The unusual sound
made by spinning the starter will not harm engine or
starter. Disconnect the power cord from receptacle
first, and then from switch box.
Recoil Starter: With engine running, pull starter
rope with a rapid, continuous full arm stroke three

Discharge snow downwind whenever possible.
Slightly overlap each previously cleared path.
Lifting up on the handle will allow the rubber on the
augers to propel the snow thrower forward. Pushing
downward on the handle will raise the augers off
the ground and stop forward motion.

NOTE: Excessive upward pressure on the handle will
result in premature wear on the rubber auger blades
which would not be covered by warranty.
•
•

_hb

Run the engine for a few minutes before stopping to
help dry any moisture on the engine.
Clean the snow thrower thoroughly after each use.
areas become hot
and can
cause
burn. Do
WARNING:
Muffler,
engine
and asurrounding
not touch.

SECTION5: MAKINGADJUSTMENTS
BeltTension

WARNING:

NEVER attempt to make any
adjustments while the engine is running,
except where specified in the operator's
manual.

ShavePlate
•

To check the adjustment of the shave plate, place
the unit on a level surface. See Figure 8. The
wheels, shave plate and augers should all contact
level surface. Note that if the shave plate is
adjusted too high, snow may blow under the
housing. If the shave plate wears out excessively,
or the unit does not self-propel, the shave plate
may be too low and needs to be adjusted.

Periodic adjustment of the belt tension may be required
due to normal stretch and wear on the belt. Adjust the
belt tension if the augers seem to hesitate while turning
although engine maintains the same speed. Follow
instructions below for adjustment:
•

The upper hole in the control handle provides
adjustment for belt tension. To adjust, disconnect
the "Z" end of control cable from the bottom hole in
the control handle. See Figure 10. Hook the cable
into the upper hole in control handle as shown.
\

Upper

Clutch
;able

NOTE: On new units or units with a new shave plate
installed, the augers may be slightly off the ground.
Control/_
Housing

Figure 10
If additional adjustment is required, follow steps below.
•
•
Augers

Shave Plate

Figure 8
To adjust, tip the snow thrower back so that it rests
on the handle. Loosen the four lock nuts and bolts
which secure the shave plate to the housing. See
Figure 9. Move the shave plate to desired position
and retighten the nuts and bolts securely.

Remove the belt cover by removing five hex screws
that hold it in place. See Figure 12.
There are three adjustment holes provided in the
idler bracket assembly. See Figure 11. To adjust,
move the extension spring on the end of the clutch
cable to the next higher adjustment position on the
idler bracket assembly. Reassemble belt cover.
High Position
Idler
Bracket

Middle Position

Low Position
Pulley

B-

_Spring
on
End of Clutch
Cable

II-

Figure 11

Carburetor
WARNING:
If any adjustments need to be
made to the engine while the engine is running
(e.g. carburetor), keep clear of all moving parts.
Be careful of muffler, engine and other
surrounding heated surfaces.
Lock Nut & Carriage Bolt
Figure 9

•

Refer to the separate engine manual, packed with
your unit, for carburetor adjustment information.

SECTION6: MAINTAININGYOURSNOWTHROWER
•
WARNING:
Before servicing, repairing, or
inspecting, disengage all clutch levers and stop
engine. Wait until all moving parts have come
to a complete stop. Disconnect spark plug wire
and ground it against the engine to prevent
unintended starting.

•

Push down on the idler pulley and slip the belt off
the auger pulley. See Figure 13.
Reassemble new belt. Reinstall the belt cover.

ReplacingShavePlate

ReplacingBelt

The shave plate is attached to the bottom of the auger
housing and is subject to wear. ]t should be checked
periodically. There are two wearing edges and the
shave plate can be reversed. Refer to Figure 9.

•

Remove the belt cover by removing five hex
screws. See Figure 12.

•

Rex

;crew
•

Remove the four carriage bolts and hex lock nuts
which attach it to the snow thrower housing.
Install new shave plate, making sure the heads of
the carriage bolts are on the inside of the housing.
Adjust the shave plate according to instructions on
page 9. Tighten securely.

Engine
•
•

Rex Screw
Belt Cover

Lubrication

Figure 12

•

Lubricate pivot points on the control handle and the
extension spring at the end of the clutch cable with
a light oil once every season and before storage of
the snow thrower at the end of the season.

•

Lubricate the flange keepers on the chute crank
once a season with a light oil making sure the crank
red moves freely. Remove bolts holding the shroud
to the housing, and lift shroud to access the chute
crank bracket.

•
•
•

Lubricate as instructed above with a light oil.
Follow "Storage" instructionsin the Engine Manual.
Store in a clean, dry area. Block the snow thrower
up so it is not resting on the rubber auger blades.
When storing in a metal storage shed, rustproof the
equipment, especially springs, cables and all
moving parts.

Pull up on the idler pulley and slip the belt off the
engine pulley. See Figure 13.

Pulley

Refer to the separate engine manual for all engine
maintenance procedures.
Check engine and snow thrower frequently for
loose hardware, and tighten as needed.

Belt
Figure 13

SECTION7: OFF-SEASON
STORAGE
WARNING:
Never store engine with fuel in
tank indoors or in enclosed, poorly ventilated
areas where fuel fumes may reach an open
flame, spark or pilot light as on a furnace, water
heater, clothes dryer, or other gas appliance.
•

•

Clean snow thrower thoroughly.

SECTION8: TROUBLESHOOTING
GUIDE
Problem
Engine fails to start

Cause

Remedy

1.
2.
3.
4.
5.
6.
7.

Fuel tank empty, or stale fuel
Blocked fuel line
Key net in ON position
Spark plug wire disconnected
Faulty spark plug
Engine not primed
Engine flooded with excessive priming

1.
2.
3.
4.
5.

1.
2.

Unit running on choke
Fuel line blocked, or stale fuel

1.
2.

3.
4.

Water or dirt in fuel system
Carburetor out of adjustment

3.
4.

Engine overheats

Carburetor out of adjustment

Refer to engine manual for instruction.

Loss of power

1.
2.

Spark plug wire loose
Vent in gas cap plugged

1.
2.

Connect and tighten spark plug wire.
Clear vent.

Excessive vibration

Loose parts or damaged auger

Stop engine immediately and
disconnect spark plug wire. Check for
possible damage. Tighten all bolts
and nuts. Repair as needed. If the
problem persists, take unit to an
authorized service dealer.

Unit fails to selfpropel

Drive cable out of adjustment

Drive belt loose or damaged

Adjust drive cable following
instructions on page 9 of this manual.
Replace drive cable.

Discharge chute clogged

Foreign object lodged in auger

Drive cable net adjusted properly

Drive belt loose or damaged

Engine runs erratic

Unit fails to
discharge snow

6.
7.

3.
4.

Fill tank with clean fresh gasoline.
Clean fuel line
Insert key and turn to ON position
Connect wire to spark plug.
Clean spark plug, readjust gap, or
replace.
Prime engine four times.
Wait at least ten minutes before
starting.
Move
Clean
clean
Refer
Refer

choke lever to OFF position.
fuel line and fill tank with fresh,
gasoline.
to engine manual for remedy.
to engine manual for remedy.

Stop engine immediately and
disconnect spark plug wire. Clean
discharge chute and the auger
housing.
Stop engine immediately and
disconnect spark plug wire. Remove
object.
Adjust drive cable following
instructions on page 9 of this manual.
Replace drive belt.

NOTE: For repairs beyond the minor adjustments listed above, contact your nearest authorized service
representative or call 1-866-840-6483 for the Customer Support Center. Refer to the engine manual for more
engine related information.

SECTION9: PARTSLISTFORMODELS521AND721
r_15

17_\
14
23

11
41

49
35
53

Models521& 721

Ref. No.

Part No.

684-0174

684-0177

3.
4.

Ref. No.

Part Description

Part No.

Part Description

Upper Chute Crank Assemby

31.

710-6481

Carriage Bolt

Lower Chute Crank Assembly

32.

710-0642

TT Screw 1/4-20 x 0.75"

684-0178

Bracket Assembly: Mitten Grip

33.

710-0773

TT Screw 3/8-16 x 0.5"

731-04075

Shroud (Model 521)

34.

710-0896

AB Screw 1/4-14 x 0,625"

35.

710-1005

B Screw 1/4-14 x 0,5"

731-2569
5,

710-0895

Shroud (Model 721)
TT Screw 1/4-15 x 0.75"

36.

711-0848A

Axle Tube

710-1003

B Screw #10-16 x 0,625"

37.

712-0116

Jam Lock Nut

710-1882

Hex FI. Screw 5/16-18 x 1.5"

38.

712-3010

Hex Nut 5/16-18

710-3083

Hex Bolt 5/16-18 x 1.375"

39.

712-3027

Lock Nut

712-0252

Jam Nut

40.

731-1033

Shave Plate

10.

712-0429

Lock Nut

41.

732-0357A

Extension Spring

11.

712-3010

Hex Nut 5/16-18

42.

736-0108

Flat Washer

12.

714-0104

Cotter Pin

43.

736-0119

Lock Washer

13.

714-0507

Cotter Pin

44.

736-0176

Flat Washer

14.

720-0201A

Knob: Chute Crank

45.

736-0242

Beleville Washer

15.

725-0201

Ignition Key

46.

736-0326

Flat Washer

16.

725-2018

Switch: Electric Start Key

47.

736-0329

Lock Washer

17.

726-0100

Push Cap

48.

741-0475

Plastic Bushing

18.

736-0119

Lock Washer

49.

741-0600

Ball Bearing

19.

736-0185

Flat Washer

50.

746-0910A

Clutch Cable

20.

736-0225

Internal Lock Washer

51.

748-0234

Shoulder Spacer

21.

736-0400

Flat Washer

52.

756-0313

Flat Idler

22.

736-0451

Saddle Washer

53.

784-5174

Bearing Cup

23.

7519636

Mitten Grip Handle

54.

784-5175B

Bracket: Brake Idler

24.

684-0190

Spark Plug Access

55.

784-5176

Belt Cover

25.

749-0711A

784-5485

Auger Assembly

749-0796B

Upper Handle: Gull Wing
Lower Handle

56.

26.

57.

784-5720

Chute Crank Bracket

27.

710-0167

Carriage Screw 1/4-20 x 0,50"

58.

684-0196

Auger Housing Assembly

28.

710-0191

Hex Bolt

59.

734-1797

Wheel Assembly

29.

710-0323

Machine Screw

60.

710-1090

Hex FI. Screw 5/16-18 x 1.25"

30.

710-0352

B Screw1/4-14 x 0.375"

NOTE: For painted parts, please refer to the list of color
codes below.
Please add the applicable color code,
wherever
needed,
to the part number to order a
replacement part. For instance, if a part numbered 700xxxx is painted powder black, the part number to order
would be 700-xxxx-0637.
Powder Black: 0637
MTD Red: 0638

Models521and721

Engine is for reference only
and may not resemble the
engine on your snow thrower,

Ref. No.
Pad No.
1.
629-0071

Description
Extension Cord

Ref. No.

Pad No.

14.

736-0242

Description
Beleville Washer

710-0157

Hex Bolt 5/16-24 x 075"

15.

736-0329

Lock Washer

710-0409

Hex Bolt 5/16-24 x 1,75"

16.

741-0475

710-0502A

TT Sems Screw

17.

751-0535

Plastic Bushing
Fuel Line Hose

710-0751

Hex Screw 1/4-20 x 0.620"

18.

751-0540A

Gas Tank

6.
7.

710-1003

B Screw #10-16 x 0.625"

19.

751-0603

710-3013

Hex Screw 1/4-20 x 0.50"

20.

754-0101A

Fuel Cap
V-Belt

8.
9.

712-3006

Hex Nut 1/4-20

21.

756-0416B

V-Pulley Half

719-0581

Spacer

22.

756-0475

Pulley

10.

726-0205

Hose Clamp

23.

784-0322

Engine Mount

11.

731-2825

Choke Knob

24.

784-0323

Support Bracket

13.

736-0119

Lock Washer

25.

784-0374

Support Plate: Engine Mount

Models521and721
Ref. No

10
\

2
/

4
\

Description

710-0487

Carriage Screw 5/16-18 x 2.0"

710-1270

Machine Screw

712-0324

Hex Lock Nut 1/4-20

720-0284

Hand Knob w/Wing Nut

720-0295

Foam Grip

725-0157

Cable Tie

736-0451

Saddle Washer

746-0883

Control Housing

747-0956

Auger Bail

10.

749-0711A

Upper Handle: Gull Wing

NOTE: For painted parts, please refer to the list of
color codes below,
Please add the applicable color
code, wherever needed, to the part number to order a
replacement part, For instance, if a part numbered
700-xxxx is painted powder black, the part number to
order would be 700-xxxx-0637,
Powder Black: 0637
MTD Red: 0638

Part No.

5
Ref. No.

Part No.

Description

710-04071

Carriage Bolt 5/16-18 x 1.0"

710-0451

Carriage Bolt 5/16-18 x 0.750"

710-3015

Hex Screw 1/4-20 x 0,75"

712-3027

Lock Nut

712-3068

Hex Lock Nut

720-0284

Hand Knob

731-0851A

Flange Keeper: Chute

731-0915C

Lower Chute

731-0921

Upper Chute

10.

736-0159

Washer

MANUFACTURER'S

LIMITED WARRANTY

TRD RILT
i

The limited warranty set forth below is given by Troy-Bilt LLC
with respect to new merchandise purchased and used in the
United States, its possessions and territories.
Troy-Bilt LLC warrants this product against defects for a
period of two (2) years commencing on the date of original
purchase and will, at its option, repair or replace, free of
charge, any part found to be defective in materials or
workmanship. This limited warranty shall only apply if this
product has been operated and maintained in accordance
with the Operator's Manual furnished with the product, and
has not been subject to misuse, abuse, commercial use,
neglect, accident, improper maintenance, alteration,
vandalism, theft, fire, water, or damage because of other peril
or natural disaster. Damage resulting from the installation or
use of any accessory or attachment not approved by Troy-Bilt
LLC for use with the product(s) covered by this manual will
void your warranty as to any resulting damage.
Normal wear parts or components thereof are subject to
separate terms as follows: All normal wear parts or
component failures will be covered on the product for a period
of 90 days regardless of cause. After 90 days, but within the
two year period, normal wear part failures will be covered
ONLY IF caused by defects in materials or workmanship of
OTHER component parts. Normal wear parts and
components include, but are not limited to: batteries, belts,
blades, blade adapters, grass bags, rider deck wheels, seats,
snow thrower skid shoes, shave plates, auger spiral rubber,
and tires.
HOW TO OBTAIN SERVICE: Warranty service is available,
WITH PROOF OF PURCHASE, through your local authorized
service dealer. To locate the dealer in your area, check your
Yellow Pages, or contact Troy-Bilt LLC at P.O. Box 361131,
Cleveland, Ohio 44136-0019, or call 1-866-840-6483 or 1330-558-7220, or log on to our Web site at www.troybilt.com.
This limited warranty does not provide coverage in the
following cases:
a.

b.
c.

FOR:

The engine or component parts thereof. These items
carry a separate manufacturer's warranty. Refer to
applicable manufacturer's warranty for terms and
conditions.
Log splitter pumps, valves, and cylinders have a sepa
rate one year warranty.
Routine maintenance items such as lubricants, filters,
blade sharpening, tune-ups, brake adjustments, clutch
adjustments, deck adjustments, and normal
deterioration of the exterior finish due to use or
exposure.

,iP'i

Troy-Bilt LLC does not extend any warranty for
products sold or exported outside of the United States,
its possesions and territories, except those sold
through Troy-Bilt LLC's authorized channels of export
distribution.

Parts that are not genuine Troy-Bilt parts are not
covered by this warranty.
Service completed by someone other than an
authorized service dealer is not covered by this
warranty
Transportation charges and service calls are not
covered

No implied warranty, including any implied warranty of
merchantability of fitness for a particular purpose,
applies after the applicable period of express written
warranty above as to the parts as identified. No other
express warranty, whether written or oral, except as
mentioned above, given by any person or entity,
including a dealer or retailer, with respect to any product,
shall bind Troy-Bilt LLC. During the period of the
warranty, the exclusive remedy is repair or replacement
of the product as set forth above.
The provisions as set forth in this warranty provide the
sole and exclusive remedy arising from the sale. TroyBilt LLC shall not be liable for incidental or consequential
loss or damage including, without limitation, expenses
incurred for substitute or replacement lawn care services
or for rental expenses to temporarily replace a warranted
product.
Some states do not allow the exclusion or limitation of
incidental or consequential damages, or limitations on how
long an implied warranty lasts, so the above exclusions or
limitations may not apply to you.
In no event shall recovery of any kind be greater than the
amount of the purchase price of the product sold. Alteration
of safety features of the product shall void this warranty.
You assume the risk and liability for loss, damage, or injury to
you and your property and/or to others and their property
arising out of the misuse or inability to use the product.
This limited warranty shall not extend to anyone other than the
original purchaser or to the person for whom it was purchased
as a gift.
HOW STATE LAW RELATES TO THIS WARRANTY: This
limited warranty gives you specific legal rights, and you may
also have other rights which vary from state to state.

Troy-Bilt LLC, P.O.BOX361131CLEVELAND,OHIO44136-0019; Phone: 1-866-840-6483,1-330-558-7220

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Troybilt 521 User Manual VARIFLEX 12 SCOOTER Manuals And Guides L0404066

TROYBILT Snowthrower, Gas Manual L0404066 TROYBILT Snowthrower, Gas Owner's Manual, TROYBILT Snowthrower, Gas installation guides

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