Cub Cadet Snow Blower 521E User Manual

Operator’s Manual  
Single Stage  
Snow Thrower  
Model 521E  
IMPORTANT: Read safety rules and instructions carefully  
Warning: This unit is equipped with an internal combustion engine and should not be used on or near any unimproved forest-  
covered, 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 your nearest engine authorized  
service dealer or contact the service department, P.O. Box 368023 Cleveland, Ohio 44136-9722.  
CUB CADET CORP. P.O. BOX 368023 CLEVELAND, OHIO 44136-9722  
PRINTED IN U.S.A.  
ECO No. 1413  
770-10050B
(5/2000)  
FORM NO.  
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SECTION 1: IMPORTANT SAFE OPERATION 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 its constituents, and certain vehicle components contain or emit chemicals  
known to State of California to cause cancer and birth 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.  
8. Let engine and machine adjust to outdoor temperature  
Training  
before starting to clear snow.  
1. Read, understand, and follow all instructions on the  
9. To avoid personal injury or property damage use extreme  
machine and in the manual(s) before attempting to  
care in handling gasoline. Gasoline is extremely  
assemble and operate. Keep this manual in a safe place  
flammable and the vapors are explosive. Serious  
for future and regular reference and for ordering  
personal injury can occur when gasoline is spilled on  
replacement parts.  
yourself or your clothes which can ignite. Wash your skin  
2. Be familiar with proper operation of all controls. Know  
and change clothes immediately.  
how to stop the machine and disengage them quickly.  
a. Use only an approved gasoline container.  
3. Never allow children under 14 years old to operate this  
b. Extinguish all cigarettes, cigars, pipes and other  
machine. Children 14 years old and over should read and  
sources of ignition.  
understand the operation instructions and safety rules in  
c. Never fuel machine indoors.  
this manual and should be trained and supervised by a  
d. Never remove gas cap or add fuel while the  
parent.  
engine is hot or running.  
4. Never allow adults to operate this machine without  
e. Allow engine to cool at least two minutes before  
proper instruction.  
refueling.  
5. Thrown objects can cause serious personal injury. Plan  
f. Never over fill fuel tank. Fill tank to no more than  
your snow throwing pattern to avoid discharge of material  
½ inch below bottom of filler neck to provide space  
toward roads, bystanders and the like.  
for fuel expansion.  
6. Keep bystanders, helpers, pets and children at least 75  
g. Replace gasoline cap and tighten securely.  
feet from the machine while it is in operation. Stop  
h. If gasoline is spilled, wipe it off the engine and  
machine if anyone enters the area.  
equipment. Move machine to another area. Wait 5  
7. Exercise caution to avoid slipping or falling, especially  
minutes before starting the engine.  
when operating in reverse.  
i. Never store the machine or fuel container inside  
Preparation  
where there is an open flame, spark or pilot light  
(e.g. furnace, water heater, space heater, clothes  
dryer etc.).  
1. Thoroughly inspect the area where the equipment is to  
be used. Remove all door mats, newspapers, sleds,  
boards, wires and other foreign objects which could be  
tripped over or thrown by the auger/impeller.  
2. 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.  
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 the  
rotating parts can amputate hands and feet.  
3. 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.  
4. Use a grounded three wire extension cord and receptacle  
for all units with electric start engines.  
5. Adjust collector housing height to clear gravel or crushed  
rock surfaces.  
6. Disengage all clutch levers before starting the engine.  
7. Never attempt to make any adjustments while engine is  
running, except where specifically recommended in the  
operator’s manual.  
2. The auger/impeller clutch lever is a safety device. Never  
bypass its operation. Doing so, makes the machine  
unsafe and may cause personal injury.  
3. The clutch levers must operate easily in both directions  
and automatically return to the disengaged position when  
released.  
4. Never operate with a missing or damaged discharge  
chute. Keep all safety devices in place and working.  
5. Never run an engine indoors or in a poorly ventilated  
area. Engine exhaust contains carbon monoxide, an  
odorless and deadly gas.  
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6. Do not operate machine while under the influence of  
alcohol or drugs.  
7. Muffler and engine become hot and can cause a burn. Do  
not touch.  
8. Exercise extreme caution when operating on or crossing  
gravel surfaces. Stay alert for hidden hazards or traffic.  
9. Exercise caution when changing direction and while  
operating on slopes.  
10. Plan your snow throwing pattern to avoid discharge  
towards windows, walls, cars etc. To avoid property  
damage or personal injury caused by a ricochet.  
11. Never direct discharge at children, bystanders and pets  
or allow anyone in front of the machine.  
12. Do not overload machine capacity by attempting to clear  
snow at too fast of a rate.  
13. Never operate this machine without good visibility or  
light. Always be sure of your footing and keep a firm hold  
on the handles. Walk, never run.  
14. Disengage power to the auger/impeller when  
transporting or not in use.  
15. Never operate machine at high transport speeds on  
slippery surfaces. Look down and behind and use care  
when in reverse.  
16. If the machine should start to vibrate abnormally, stop the  
engine, disconnect the spark plug and ground it against  
the engine. Inspect thoroughly for damage. Repair any  
damage before starting and operating.  
17. Disengage all clutch levers and stop engine before you  
leave the operating position (behind the handles). Wait  
until the auger/impeller comes to a complete stop before  
unclogging the discharge chute, making any  
adjustments, or inspections.  
18. Never put your hand in the discharge or collector  
openings. Always use a clearing tool to unclog the  
discharge opening.  
19. Use only attachments and accessories approved by the  
manufacturer (e.g. wheel weights, tire chains, cabs etc.).  
20. If situations occur which are not covered in this manual,  
use care and good judgment. Contact your dealer or  
telephone 1-800-528-1009 for assistance and the name  
of your nearest servicing dealer.  
Maintenance & Storage  
1. Never tamper with safety devices. Check their proper  
operation regularly.  
2. Disengage all clutch levers and stop engine. Wait until  
the auger/impeller come to a complete stop. Disconnect  
the spark plug wire and ground against the engine to  
prevent unintended starting before cleaning, repairing, or  
inspecting.  
3. Check bolts, and screws for proper tightness at frequent  
intervals to keep the machine in safe working condition.  
Also, visually inspect machine for any damage.  
4. Do not change the engine governor setting or over-speed  
the engine. The governor controls the maximum safe  
operating speed of the engine.  
5. Snow thrower shave plates and skid shoes are subject to  
wear and damage. For your safety protection, frequently  
check all components and replace with original  
equipment manufacturers (O.E.M.) parts only. Use of  
parts which do not meet the original equipment  
specifications may lead to improper performance and  
compromise safety!”  
6. Check clutch controls periodically to verify they engage  
and disengage properly and adjust, if necessary. Refer to  
the adjustment section in this operators manual for  
instructions.  
7. Maintain or replace safety and instruction labels, as  
necessary.  
8. Observe proper disposal laws and regulations for gas,  
oil, etc. to protect the environment.  
9. Prior to storing, run machine a few minutes to clear snow  
from machine and prevent freeze up of auger/impeller.  
10. Never store the machine or fuel container inside where  
there is an open flame, spark or pilot light such as a water  
heater, furnace ,clothes dryer etc.  
11. Always refer to the operators manual for proper  
instructions on off-season storage.  
Your Responsibility:  
Restrict the use of this power machine to persons who  
read, understand and follow the warnings and  
instructions in this manual and on the machine.  
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SECTION 2: ASSEMBLING YOUR SNOW THROWER  
Unpacking From Carton  
Before Assembly  
Cut along corners of the carton and lay it down flat.  
See Figure 1. Remove packing material.  
Remove any loose parts included with unit (i.e.,  
operators manual, etc.).  
WARNING: Disconnect the spark plug wire  
and ground it against the engine to prevent  
unintended starting.  
Roll unit out of carton. Check carton thoroughly for  
any remaining loose part.  
Raising Upper Handle  
Loosen the hand knob on each side of the handle.  
Remove packing material, if any.  
Remove loose parts  
Raise  
handle  
to here  
Hand Knob  
Roll unit out  
Figure 1  
Hardware Pack  
1. Ignition Keys* (2)  
*One key may be in the switch on snow thrower.  
Figure 3  
(Items 2 to 5 are illustrated in Figure 2.)  
Raise the upper handle in the direction shown in  
Figure 3 till it clicks into the operating position.  
Make sure not to pinch or crimp the cable.  
Tighten the hand knobs.  
2. Eyebolt  
3. Saddle Washer 5/16" I.D.  
4. Hex Nuts 5/16-18 Thread (2)  
5. Cotter Pin  
Attaching Control Cable  
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.  
Eye Bolt  
Hex Nut  
Route the control cable over the lower handle.  
Insert the end of the cable into the hole in the  
control housing as shown in Figure 4. Push the  
plastic fitting until it locks into the control housing.  
Saddle  
Washer  
Cotter Pin  
Figure 2: Hardware Pack  
“Z” End  
Bottom  
of Cable  
Hole In  
Control  
Handle  
Items Required For Assembly  
1. Pair of pliers (not necessary, but helpful)  
2. Two cycle engine oil (included)  
3. Fresh gasoline  
Control  
Plastic  
Fitting  
Housing  
NOTE: All references to left or right side of the snow  
thrower is from the operating position only.  
Figure 4  
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Lift the control handle up, and hook the Zend 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. Hold the Zfitting with the pliers, not the  
cable, to avoid damaging the cable.  
Secure eyebolt with 5/16saddle washer and hex  
nut. The cupped side of washer goes against the  
handle. Adjust lower hex nut until the eyebolt is  
positioned so that the chute crank turns freely  
(does not bind).  
Move upper hex nut down against the lower handle.  
Tighten lower hex nut securely.  
NOTE: The upper hole in the control handle provides  
for adjustment in belt tension. Refer to page 9 of this  
manual for instructions.  
Assembling Discharge Chute  
The snow thrower has been shipped with the upper  
chute pivoted all the way down. Assemble as follows:  
Installing Chute Crank  
Turn the chute crank until the chute faces straight  
to the front. See Figure 7 .  
Thread one 5/16hex nut half way onto the eyebolt.  
See Figure 5. All necessary hardware is included in  
the hardware pack shipped with your unit. See  
Figure 2 for more details.  
Flat  
Washer  
Hand  
Carriage  
Bolt  
Knob  
Slide the eyebolt onto the chute crank. Insert  
eyebolt into the hole in the lower handle.  
Chute Crank  
Front  
Eye Bolt  
Upper  
Chute  
Hex  
Nuts  
Saddle  
Washer  
Figure 7  
Remove the hand knob, flat washer and carriage  
bolt from the upper chute. See Figure 7.  
Pivot the upper chute up so that there is no gap  
between the upper and the lower chute. See Figure  
8. Secure with hardware just removed.  
Figure 5  
Insert the chute crank into the coupler at the top  
right side of the snow thrower. See Figure 6.  
Rotate the crank to align holes, and insert the cotter  
pin. Bend ends of cotter pin in opposite directions to  
secure. See Figure 6.  
Cotter Pin  
No  
Gap  
Chute Crank  
Coupler  
Pivot  
the upper  
chute  
Figure 6  
Figure 8  
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SECTION 3: KNOW YOUR SNOW THROWER  
Be familiar with all the controls and their proper operation. Know how to stop the machine and disengage  
them quickly.  
Auger Control  
Handle  
Upper  
Handle  
Chute Crank  
Ignition  
Key  
Spark  
Plug  
Cover  
Primer  
Button  
Electric  
Starter  
Discharge  
Chute  
Starter  
Handle  
Choke Lever  
Off  
Plug for  
Electric  
Cord  
On  
Shave  
Plate  
Auger  
Electric Cord  
Figure 9  
Compare Figure 9 with the controls on your snow  
thrower before starting the machine or trying to  
operate it.  
Auger Control Handle  
Located on the upper handle, the auger control handle  
is used to engage and disengage the augers. The snow  
thrower is designed to be propelled by the rotation of  
the augers. Pull the control handle back against the  
upper handle to engage the augers; release to  
disengage.  
Choke Lever  
Place choke lever in ONposition to start a cold  
engine.  
Primer Button  
Chute Crank  
Used to inject fuel directly into the carburetor to insure  
fast starts in cold weather. Follow engine manual to  
prime engine.  
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.  
Ignition Key  
Used to start engine. Put key in ONposition to start.  
Discharge Chute  
Starter Handle  
Used to manually start the engine.  
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.  
Electric Starter  
Used to start engine with a 120V power source.  
Plug for Electric Start  
Requires use of a two-prong outdoor electric cord  
and a 120V power source.  
Stopping Engine  
Spark Plug Cover  
Spark plug located under the cover.  
Turn ignition key to OFF position and remove it  
from the snow thrower.  
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SECTION 4: OPERATING YOUR SNOW THROWER  
If you have a grounded three-prong receptacle,  
proceed as instructed in the engine manual.  
Before Starting  
WARNING: Read, understand, and follow  
all instructions and warnings on the machine Operating Snow Thrower  
and in this manual before operating.  
Upper  
Discharge  
Chute  
The spark plug wire was disconnected for safety  
purposes during assembly. Attach spark plug wire  
to spark plug before starting.  
Fuel & Oil Mixture  
WARNING: Use extreme care when  
Hand  
Knob  
handling gasoline. Gasoline is extremely  
flammable and the vapors are explosive.  
Never fuel machine indoors or while the  
engine is hot or running. Extinguish cigarettes,  
cigars, pipes and other sources of ignition.  
Figure 10  
Your snow thrower uses a two cycle engine that  
requires a mixture of gasoline and two cycle engine  
oil. Refer to the engine operators manual for proper oil  
and fuel recommendations.  
Adjust the upper discharge chute up or down as  
shown in Figure 10. Then 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.  
See Figure 11. 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.  
A plastic cup was provided inside the fuel fill  
opening on the fuel tank. Remove and discard this  
cup before filling up the tank. Use the seperate fuel  
tank cap to close after fill-up.  
Starting Engine  
Recoil Starter  
To start the engine of your snow thrower, follow the  
engine manual.  
Press auger  
control handle  
to engage  
auger  
Electric Starter  
WARNING: 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. It 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.  
Turn handle  
to change  
discharge  
direction  
Determine that your house wiring is a three-wire  
grounded system. Ask a licensed electrician if you  
are not certain.  
If your house wiring system is not 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.  
Figure 11  
Stopping Engine  
Run the engine for a few minutes before stopping to  
help dry any moisture on the engine.  
To stop engine: Turn ignition key to OFF position  
and remove it from the snow thrower.  
IMPORTANT: Keep the ignition key in a safe place.  
Engine will not start without it.  
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Wipe all snow and moisture from the unit. Move the  
choke lever back and forth several times and leave  
it in the ON position.  
NOTE: Excessive upward pressure on the handle will  
result in premature wear on the rubber auger blades  
which would not be covered by warranty.  
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.  
Operating Tips  
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 the forward motion.  
WARNING: Muffler, engine and surrounding  
areas become hot and can cause a burn. Do  
not touch.  
SECTION 5: MAKING ADJUSTMENTS  
WARNING: NEVER attempt to make any  
adjustments while the engine is running, except  
where specified in the operators manual.  
Shave Plate  
To check the adjustment of the shave plate, place  
the unit on a level surface. See Figure 12. 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 will not self-propel, the shave plate may  
be adjusted too low.  
Nuts & Bolts  
Figure 13  
NOTE: On new units or units with a new shave plate  
installed, the augers may be slightly off the ground.  
Belt Tension  
Periodic adjustment of the belt tension may be required  
due to normal stretch and wear on the belt. If augers  
hesitate while turning although engine maintains same  
speed, adjust tension following instructions below.  
The upper hole in the control handle provides  
adjustment for belt tension. To adjust, disconnect  
the Zend of control cable from the bottom hole in  
the control handle. See Figure 14 . Hook the cable  
into the upper hole in control handle as shown.  
Augers  
Wheels  
Shave Plate  
Figure 12  
Upper  
Hole  
To adjust, tip the snow thrower back so that it rests  
on the handle. Loosen the lock nuts and bolts which  
secure the shave plate to the housing. See Figure  
13. Move the shave plate to desired position and  
retighten the nuts and bolts. Make certain all nuts  
and bolts are tightened securely  
Clutch  
Cable  
Control  
Housing  
Figure 14  
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If additional adjustment is required, follow steps below.  
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.  
Remove the belt cover by removing five hex screws  
that hold it in place. For location of the belt cover,  
see Figure 16.  
There are three adjustment holes provided in the  
idler bracket assembly. For location of these holes,  
see Figure 15.  
Carburetor  
WARNING: If any adjustments need to be  
Middle Position  
High Position  
Idler  
Bracket  
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.  
Low Position  
Refer to the separate engine manual, packed with  
your unit, for carburetor adjustment information.  
Spring on  
End of Clutch  
Cable  
Auger  
Pulley  
Figure 15  
SECTION 6: MAINTAINING YOUR SNOW THROWER  
Some adjustments will have to be made  
General Recommendations  
periodically to maintain your unit properly. All  
adjustments in the Making Adjustments section of  
this manual should be checked at least once each  
season.  
Periodically check all fasteners and make sure  
these are tight  
Follow the maintenance schedule given below to  
get quality performance from your snow thrower for  
a long time.  
Always observe safety rules when performing any  
maintenance.  
The warranty on this snow thrower does not cover  
items that have been subjected to operator abuse  
or negligence. To receive full value from the  
warranty, operator must maintain the snow thrower  
as instructed in this manual.  
Changing of engine governed speed will void  
engine warranty.  
Customer Responsibilities  
MAINTENANCE SCHEDULE  
SERVICE DATES  
Lubricate pivot points  
Clean snow thrower  
Check shave plate adjustment  
Check belt  
Clean engine  
Check spark plug  
10  
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Pull up on the idler pulley and slip the belt off the  
engine pulley.  
Push down on the idler pulley and slip the belt off  
the auger pulley.  
Reassemble new belt. See Figure 17.  
Reinstall the belt cover.  
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.  
Replacing Shave Plate  
The shave plate is subject to wear. It should be  
checked periodically. There are two wearing edges and  
the shave plate can be reversed. See Figure 13 .  
Idler Pulley  
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 procedure in  
the Making Adjustmentssection of this manual.  
Tighten securely.  
Engine  
Pulley  
Auger  
Pulley  
Belt  
Figure 17  
Replacing Belt  
Remove the belt cover by removing five hex  
screws. See Figure 16.  
Engine  
Refer to the separate engine operators manual  
packed with your snow thrower for all engine  
maintenance procedures.  
Check engine and snow thrower frequently for  
loose hardware, and tighten as needed.  
Lubrication  
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.  
Hex  
Belt Cover  
Screws  
Figure 16  
SECTION 7: OFF-SEASON STORAGE  
Follow Storageinstructions in the Engine Manual.  
Store in a clean, dry area. Block the snow thrower  
up so it is not resting on the rubber auger blades.  
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.  
NOTE: When storing any type of power equipment in  
an poorly ventilated or metal storage shed, care should  
be taken to rustproof the equipment, especially springs,  
cables and all moving parts.  
Clean snow thrower thoroughly.  
Lubricate as instructed above with a light oil.  
11  
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SECTION 8: TROUBLESHOOTING GUIDE  
Problem  
Cause  
Remedy  
Engine fails to start  
1. Fuel tank empty, or stale fuel  
1. Fill tank with clean fresh gasoline/oil  
mixture as specified in the engine manual.  
2. Clean fuel line  
2. Blocked fuel line  
3. Key not in ON position  
4. Spark plug wire disconnected  
5. Faulty spark plug  
3. Insert key and turn to ON position  
4. Connect wire to spark plug.  
5. Clean spark plug, readjust gap, or replace.  
6. Refer to engine manual  
6. Gasoline and oil not mixed correctly  
Engine runs erratic  
1. Unit running on choke  
2. Fuel line blocked, or stale fuel  
1. Move choke lever to off position.  
2. Clean fuel line and fill tank with fresh,  
clean gasoline.  
3. Water or dirt in fuel system  
4. Carburetor out of adjustment  
3. Refer to engine manual on remedy.  
4. Refer to engine manual.  
Engine overheats  
Loss of power  
1. Gasoline and oil not mixed correctly  
1. Drain fuel tank and refill with proper fuel  
mixture.  
2. Refer to engine manual.  
2. Carburetor out of adjustment  
1. Spark plug wire loose  
2. Vent in gas cap plugged  
3. Exhaust port plugged.  
1. Connect and tighten spark plug wire.  
2. Clear vent.  
3. Clean port.  
Excessive vibration  
1. Loose parts or damaged auger  
1. 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 self-propel 1. Drive cable out of adjustment  
2. Drive belt loose or damaged  
1. Adjust drive cable following instructions on  
snow thrower.  
2. Replace drive cable following instructions  
on snow thrower.  
Unit fails to discharge 1. Discharge chute clogged  
snow  
1. Stop engine immediately and disconnect  
spark plug wire. Clean discharge chute  
and the auger housing.  
2. Foreign object lodged in auger  
3. Drive cable not adjusted properly  
4. Drive belt loose or damaged  
2. Stop engine immediately and disconnect  
spark plug wire. Remove object .  
3. Adjust drive cable following instructions on  
snow thrower.  
4. Replace drive belt following instructions  
on snow thrower.  
NOTE: For repairs beyond the minor adjustments listed above, call the Customer Dealer Line at 1-800-528-1009 for  
the dealer nearest you. Refer to separate engine manual, packed with your snow thrower, for engine information.  
12  
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SECTION 9: PARTS LIST FOR MODEL 521E  
5
9
10  
4
2
3
7
8
6
1
4
7
Ref. No. Part No.  
Description  
710-0487 Carriage Screw  
1.  
2.  
3.  
4.  
5.  
6.  
7.  
8.  
9.  
10.  
710-1270 Oval C-Sunk Machine Screw  
712-0324 Hex Lock Nut  
720-0284 Wing Nut  
720-0295 Foam Grip: Handle  
725-0157 Cable Tie  
736-0451 Saddle Washer  
746-0883 Cable Housing w/o Throttle  
747-0956 Auger Bail: Gull Wing  
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 Cub Yellow,  
the part number to order would be 700-xxxx-0716.  
Cub Yellow: 0716  
Cub Beige: 0499  
Cub Blue: 0685  
Powder Black: 0637  
13  
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Model 521E  
19  
26  
11  
16  
26  
2
4
18  
33  
15  
17  
9
7
28  
5
22  
35  
25  
6
42 45  
30  
13  
44  
6
21  
38  
22  
37  
10  
31  
34  
13  
46  
3
7
1
30  
35  
23  
32  
12  
6
20  
14  
40  
27  
39  
8
36  
41  
14  
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Model 521E  
Ref. No.  
Part No.  
Part Description  
Carriage Bolt  
Carriage Bolt  
Pan Head Screw  
Carriage Bolt  
Hex Washer Screw  
Hex Washer Screw  
Hex Washer Screw  
Hex Washer Screw  
Hex Cap Screw  
Ref. No.  
Part No.  
736-0176  
736-0159  
736-0326  
736-0329  
741-0600  
Part Description  
Flat Washer  
Washer  
Flat Washer  
Lock Washer  
Ball Bearing  
710-0167  
710-0276  
710-0323  
710-0451  
710-0642  
710-1005  
710-0773  
710-0896  
710-3015  
1.  
2.  
3.  
4.  
5.  
6.  
7.  
8.  
9.  
10.  
11.  
12.  
13.  
15.  
16.  
17.  
18.  
19.  
20.  
21.  
22.  
23.  
25.  
26.  
27.  
28.  
30.  
31.  
32.  
33.  
34.  
35.  
36.  
37.  
38.  
39.  
40.  
41.  
42.  
43.  
44.  
45.  
46.  
746-0910A CableClutch  
748-0234  
749-0796  
756-0313  
784-5174  
784-5176  
Spacer  
HandleLower  
Flat Idler  
Bearing Cup  
CoverBelt  
711-0848A Axle  
712-0429  
712-3010  
712-0116  
712-3027  
720-0284  
731-0851A Chute Keeper  
731-0915B Lower Chute  
731-0921  
731-1033  
Hex Center Lock Nut  
Hex Nut  
Hex Lock Nut  
Hex Lock Flanged Nut  
Knob  
784-5175B Idler/Brake Bracket  
684-0114  
784-5485  
753-0613  
710-0352  
784-5720  
710-0451  
736-0242  
741-0475  
710-0191  
Blower Housing  
Auger Assy. Comp.  
Auger Rubber Replacement  
Hex Washer Screw  
Crank Bracket  
Cap Screw  
Bell Washer  
Bushing  
Hex Screw  
Upper Chute  
Shave Plate  
732-0357A Extension Spring  
736-0108  
736-0119  
Flat Washer  
Lock Washer  
1
Ref. No.  
Part No.  
Description  
1
734-1811  
Wheel Assembly: 7 x 1.7”  
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 Cub  
Yellow, the part number to order would be 700-xxxx-0716.  
Cub Yellow: 0716  
Cub Beige: 0499  
Cub Blue: 0685  
Powder Black: 0637  
15  
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Model 521E  
17  
28  
11  
21  
10  
26  
7
25  
2
27  
7
9
23  
8
6
13  
15  
14  
19  
29  
4
22  
24  
18  
7
3
16  
5
5
20  
16  
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Model 521E  
Ref. No.  
1.  
Part No.  
684-0054A  
684-0126  
710-1003  
710-1090  
710-1268  
710-1652  
712-3010  
714-0104  
714-0507  
715-0138  
720-0201A  
725-0201  
725-1341B  
725-1346  
725-1347  
725-1425  
726-0100  
731-1089A  
731-1133B  
731-2109  
735-0234  
736-0119  
736-0185  
736-0225  
736-0451  
747-0697  
747-0737  
750-0785  
Part Description  
Dash Assembly  
Chute Crank Assembly  
Special Screw: 310-16 x 0.375”  
Hex Flange Screw 5/16-18 x 1.25”  
Special screw  
2.  
3.  
4.  
5.  
6.  
7.  
8.  
9.  
Self-Tapping Screw 1/4-20 x .625”  
Hex Nut 5/16-18  
Hairpin Clip  
Cotter Pin  
Roll Pin  
10.  
11.  
12.  
13.  
14.  
15.  
16.  
17.  
18.  
19.  
20.  
21.  
22.  
23.  
24.  
25.  
26.  
27.  
28.  
29.  
Chute Crank Knob  
Ignition Key  
Ignition Key w/o Logo  
Ignition Switch Nut  
Ignition Switch Cap  
Switch: Key, Recoil Start  
Push Cap  
Choke Cover  
Spilling Cup  
Shroud: 21Beige  
Rubber Grommet  
Lock Washer  
Flat Washer  
Internal Lock Washer  
Saddle Washer  
Eyebolt  
Upper Chute Crank  
Spacer  
7510009636 Mitten Grip Handle  
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 Cub Yellow, the part number to  
order would be 700-xxxx-0716.  
Cub Yellow: 0716  
Cub Beige: 0499  
Cub Blue: 0685  
Powder Black: 0637  
17  
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Model 521E  
18  
10  
15**  
4
17  
1
8
6
13  
5
14  
6
16  
13  
9
2
11  
7
20  
12  
3
19  
21  
Ref. No. Part No.  
Part Description  
Extension Cord  
705-5139A Support Bracket: Gas Tank  
629-0236  
1.  
2.  
710-0157  
710-1003  
710-1652  
710-3013  
710-3025  
726-0152  
726-0205  
Hex Screw 5/16-24 x .75”  
Special Screw  
3.  
4.  
5.  
6.  
7.  
8.  
9.  
Self-Tapping Screw  
Hex Screw 1/4-20 x .50”  
Hex Screw 5/16-24 x .625  
Mounting Clamp  
NOTE: For painted parts, please refer to the list of color  
codes below. Please add the applicable color code,  
Hose Clamp  
wherever needed, to the part number to order  
a
731-2113A Cup  
replacement part. For instance, if a part, numbered 700-  
xxxx, is painted Cub Yellow, the part number to order  
would be 700-xxxx-0716.  
10.  
11.  
12.  
13.  
14.  
15.  
736-0119  
736-0242  
736-0329  
741-0475  
Lock Washer  
Beleville Washer  
Lock Washer  
Cub Yellow: 0716  
Cub Beige: 0499  
Cub Blue: 0685  
Powder Black: 0637  
Plastic Bushing  
Recoil Handle  
**Obtain from engine manufacturer  
751-0535  
Fuel Line Hose  
16.  
17.  
18.  
19.  
20.  
21.  
751-0540A Fuel Tank: 2 Quart  
751-0800 Fuel Cap  
754-0101A V-Belt  
756-0416B V-Pulley Half  
756-0475  
Pulley  
18  
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Model 521E  
19  
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MANUFACTURERS LIMITED WARRANTY FOR:  
TWO-YEAR RESIDENTIAL  
ONE-YEAR COMMERCIAL  
Proper maintenance of your Cub Cadet equipment is the owners responsibility. Follow the instructions in your  
operators manual for correct lubricants and maintenance schedule. Your Cub Cadet dealer carries a  
complete line of quality lubricants and filters for your equipments engine, transmission, chassis and  
attachments.  
Riding mowers, lawn tractors, garden tractors, Cub Cadet  
attachments and home maintenance products  
This limited warranty for residential users, covers any defect in materials or workmanship in your Cub Cadet  
equipment for two years from the date of purchase for the first user purchaser. We will replace or repair any  
part or parts without charge through your authorized Cub Cadet dealer.  
Batteries have a one-year prorated limited warranty with 100% replacement during the first three months.  
V-belts for either the traction drive or any attachments are covered for one year only.  
Cub Cadet equipment used commercially is warranted for one year only.  
(Commercial use is defined as either having hired operators or used for income producing purposes.)  
Items not covered  
The warranty does not cover routine maintenance items such as lubricants, filters (oil, fuel, air and hydraulic),  
cleaning, tune-ups, brake and/or clutch inspection, adjustments made as part of normal maintenance, blade  
sharpening, set-up, abuse, accidents and normal wear. It does not cover incidental costs such as transporting  
your equipment to and from the dealer, telephone charges or renting a product temporarily to replace a  
warranted product.  
There is no other express warranty.  
How to obtain service  
Contact your authorized Cub Cadet servicing dealer who sold you your Cub Cadet equipment. If this dealer is  
not available, see the Consumer Yellow Pages under lawn mowersfor the name of a dealer near you.  
If you need further assistance in finding an authorized Cub Cadet servicing dealer, contact:  
Cub Cadet Corporation  
Post Office Box 368023  
Cleveland, Ohio 44136  
How does state law apply?  
This limited warranty gives you specific legal rights, and you may also have other rights which vary from state  
to state.  
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