Cub Cadet 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
FORM NO.
770-10050B.fm
(5/2000)
TABLE OF CONTENTS
Content Page
Important Safe Operation Practices .................................................................. 3
Assembling Your Snow Thrower ....................................................................... 5
Know Your Snow Thrower................................................................................. 7
Operating Your Snow Thrower .......................................................................... 8
Making Adjustments.......................................................................................... 9
Maintaining Your Snow Thrower ....................................................................... 10
Off-Season Storage .......................................................................................... 11
Troubleshooting ................................................................................................ 12
Parts List ........................................................................................................... 13
FINDING MODEL NUMBER
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.
(Model Number)
(Serial Number)
Copy the model number here:
Copy the serial number here:
CUB CADET CORP.
P.O. BOX 368023
CLEVELAND, OHIO 44136
CALLING CUSTOMER SUPPORT
If you have difficulty assembling this product or have any questions regarding the controls, operation
or maintenance of this unit, please call the Cub Cadet Customer Dealer Referral Line at 1-(800)-528-
1009. Please have your unit’s model number and serial number ready when you call. See previous
section to locate this information. By having the model and serial numbers ready, you help your Cub
Cadet dealer give you faster service.
For more details about your machine, visit our website at www.cubcadet.com
2
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.
Training
1. 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.
2. Be familiar with proper operation of all controls. Know
how to stop the machine and disengage them quickly.
3. 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.
4. Never allow adults to operate this machine without
proper instruction.
5. Thrown objects can cause serious personal injury. Plan
your snow throwing pattern to avoid discharge of material
toward roads, bystanders and the like.
6. 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.
7. Exercise caution to avoid slipping or falling, especially
when operating in reverse.
Preparation
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.
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.
8. Let engine and machine adjust to outdoor temperature
before starting to clear snow.
9. 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
½ inch 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 the
rotating parts can amputate hands and feet.
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.
3
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 manufacturer’s (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 operator’s 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 operator’s 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.
4
SECTION 2: ASSEMBLING YOUR SNOW THROWER
Unpacking From Carton
• 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.,
operator’s manual, etc.).
• Roll unit out of carton. Check carton thoroughly for
any remaining loose part.
Remove loose parts
Roll unit out
Figure 1
Hardware Pack
1. Ignition Keys* (2)
*One key may be in the switch on snow thrower.
(Items 2 to 5 are illustrated in Figure 2.)
2. Eyebolt
3. Saddle Washer 5/16" I.D.
4. Hex Nuts 5/16-18 Thread (2)
5. Cotter Pin
Eye Bolt
Saddle
Washer
Hex Nut
Cotter Pin
Before Assembly
WARNING: Disconnect the spark plug wire
and ground it against the engine to prevent
unintended starting.
Raising Upper Handle
• Loosen the hand knob on each side of the handle.
Remove packing material, if any.
Raise
handle
to here
Hand Knob
Figure 3
• 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.
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.
• 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.
Figure 2: Hardware Pack
Items Required For Assembly
1. Pair of pliers (not necessary, but helpful)
2. Two cycle engine oil (included)
3. Fresh gasoline
NOTE: All references to left or right side of the snow
thrower is from the operating position only.
Bottom
Hole In
Control
Handle
Control
Housing
5
“Z” End
of Cable
Figure 4
Plastic
Fitting
• 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. Hold the “Z” fitting with the pliers, not the
cable, to avoid damaging the cable.
NOTE: The upper hole in the control handle provides
for adjustment in belt tension. Refer to page 9 of this
manual for instructions.
Installing Chute Crank
• Thread one 5/16” hex 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.
• Slide the eyebolt onto the chute crank. Insert
eyebolt into the hole in the lower handle.
Chute Crank
Eye Bolt
• Secure eyebolt with 5/16” saddle 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.
Assembling Discharge Chute
The snow thrower has been shipped with the upper
chute pivoted all the way down. Assemble as follows:
• Turn the chute crank until the chute faces straight
to the front. See Figure 7 .
Flat
Hand
Knob
Front
Washer
Carriage
Bolt
Hex
Nuts
Saddle
Washer
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
Chute Crank
Coupler
Upper
Chute
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.
No
Gap
Pivot
the upper
chute
Figure 6
Figure 8
6
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