Cub Cadet PR-521 User Manual

Operator’s Manual

21” Rear & Side

Discharge Mulching

Mower

Model PR-521

(11A-438C100)

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.

FORM NO.

770-10088A.fm
(12/99)

TABLE OF CONTENTS

Content Page

Important Safe Operation Practices...................................................................3

Slope Gauge......................................................................................................6

Assembling Your Lawn Mower...........................................................................7

Know Your Lawn Mower ....................................................................................9

Operating Your Lawm Mower ............................................................................9

Making Adjustments ..........................................................................................10

Maintaining Your Lawn Mower...........................................................................11

Off-Season Storage...........................................................................................13

Troubleshooting.................................................................................................13

Parts List............................................................................................................14

FINDING MODEL NUMBER

This Operator’s Manual is an important part of your new lawn mower. It will help you assemble, prepare and
maintain the unit for best performance. Please read and understand what it says.

Before you start assembling your new equipment, 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 at the operating position and looking down at the rear
of the mower deck. 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 Customer Dealer Referral Line at the number given below.

Call 1- (800)-528-1009 to reach the Cub Cadet Customer Dealer Referral Line or 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 numbe r in order to pr ocess your call .

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SECTION 1: IMPORTANT SAFE OPERATION PRACTICES

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 your lawn mower. Failure to comply with these instructions may result in personal
injury. When you see this symbol, heed its warning.

WARNING: The Engine Exhaust from this product contains chemicals known to the State of California to
cause cancer, birth defects or oth er reproductive harm.

DANGER: Your lawn mower 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
lawn mower is capable of amputating hands and feet and throwing objects. Failure to observe the following safety
instructions could result in serious injury or death.

GENERAL OPERA TION

• Read this operator’s manual carefully in its entirety
before attempting to assemble this machine. Read,
understand, and follow all instructions on the
machine and in the manual(s) before operation. Be
completely familiar with the controls and the pro per
use of this machine before operating it. Keep this
manual in a safe place for future and regular
reference and for ordering replacement parts.

• Your rotary mower is a precision piece of power
equipment, not a plaything. Therefore, exercise
extreme caution at all times. Your unit has been
designed to perform one job: to mow grass. Do not
use it for any other purpose.

• Never allow children under 14 years old to operate
a power mower. Children 14 years old and over
should only operate mower under close parental
supervision. Only responsible individuals who are
familiar with these rules of safe operation should be
allowed to use your mower.

• Keep the area of operation clear of all persons,
particularly small children and pets. Stop engine
when they are in the vicinity of your mower to help
prevent blade contact or thrown object injury.
Although the area of operation should be
completely cleared of foreign objects, an object may
have been overlooked and could be accidentally
thrown by the mower in any direction and cause
serious personal injury to the operator or any others
allowed in the area.

• Wear sturdy, rough-soled work shoes and close­fitting slacks and shirts. Shirts and pants that cover
the arms and legs and steel-toed shoes are
recommended. Do not wear loose fitting clothes or
jewelry. They can be caught in moving parts. Never
operate a unit in bare feet, sandals, slippery or light
weight (e.g. canvas) shoes.

• Always wear safety glasses or safety goggles
during operation or while performing an adjustment
or repair, to protect eyes from foreign objects that
may be thrown from the machine in any direction.

• Thoroughly inspect the area where the equipment is
to be used. Remove all stones, sticks, wire, bones,
toys and other foreign objects which could be

picked up and thrown by the mower in any direction
and cause serious personal injury to the operator or
any others allowed in the area. Plan your mowing
pattern to avoid discharge of material toward roads,
sidewalks, bystanders and the like. To help avoid a
thrown objects injury, keep children, bystanders
and helpers at least 75 feet from the mower while it
is in operation.

• Do not put hands or feet near or under rotating
parts. Keep clear of discharge opening at all times
as the rotating blade can cause injury.

• Many injuries occur as a result of the mower being
pulled over the foot during a fall. Do not hang on to
the mower if you are falling; release the handle
immediately.

• Never pull the mower toward you while you are
walking. If you must back the mower away from a
wall or obstruction first look down and behind, and
then follow these steps:

a. Step back from the mower to fully extend your

arms.

b. Be sure you are well balanced with sure

footing.

c. Pull the mower back slowly, no more than half

way toward you.

d. Repeat these steps as needed.

• Do not operate the mower while under the influence
of alcohol or drugs.

• Do not engage the self-propelled mechanism on
units so equipped while starting engine.

• The blade control handle is a safety device. Never
attempt to bypass its operation. Doing so makes the
safety device inoperative and may result in personal
injury through contact with the rotating blade. The
blade control handle must operate easily in both
directions and automatically return to the
disengaged position when released.

• Never operate the mower in wet grass. Always be
sure of your footing. A slip and fall can cause
serious personal injury. Keep a firm hold on the
handle and walk, never run. If you feel you are
losing your footing, RELEASE THE BLADE
CONTROL HANDLE IMMEDIATELY and the blade
will stop rotating within three seconds.

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• Mow only in daylight or good artificial light.

• Stop the blade when crossing gravel drives, walks
or roads.

• If the equipment should start to vibrate abnormally,
stop the engine and check immediately for the
cause. Vibration is generally a warning of trouble.

• Shut the engine off and wait until the blade comes
to a complete stop before removing the grass
catcher or unclogging the chute. The cutting blade
continues to rotate for a few seconds after the
engine is shut off. Never place any part of the body
in the blade area until you are sure the blade has
stopped rotating.

• Never operate mower without proper guards, grass
catcher, plates or other safety protective devices in
place.

• Muffler and engine become hot and can cause a
burn. Do not touch.

• Only use accessories approved for this machine by
the manufacturer. Read, understand, and follow all
instructions provided with the approved accessory.

• If situations occur which are not covered in this
manual, use care and good judgment. Contact your
dealer for assistance. Telephone [phone]
for the name of your nearest dealer.

Slope Operation

• For your safety, use the slope gauge included as
part of this manual to measure slopes before
operating this unit on a sloped or hilly area. If the
slope is greater than 15 degrees as shown on the
slope gauge, do not operate this unit on that area or
serious injury could result.

Do:

• Mow across the face of slopes; never up and down.
Exercise extreme caution when changing direction
on slopes.

• Watch for holes, ruts, hidden objects, or bumps. Tall
grass can hide obstacles.

• Always be sure of your footing. A slip and fall can
cause serious personal injury. If you feel you are
losing your balance release the blade control
handle immediately and the blade will s top in less
than 3 seconds.

Do NOT:

• Do not mow near drop-offs, ditches or
embankments. The operator could lose footing or
balance.

• Do not mow slopes greater than 15 degrees as
shown on the slope gauge.

• Do not mow on wet grass. Reduced footing could
cause slipping.

Children

• Tragic accidents can occur if the operator is not
alert to the presence of children. Children are often
attracted to the mower and the mowing activity.

Never assume that children will remain where you
last saw them.

• Keep children out of the mowing area and under the
watchful care of a responsible adult other than the
operator.

• Be alert and turn mower off if a child enters the
area.

• Before and while moving backwards, look behind
and down for small children or other objects.

• Never allow children under age 14 to operate the
mower. Children 14 years of age and above should
read and understand the operation instructions and
safety rules in this manual.

• Use extreme care when approaching blind corners,
shrubs, trees, or other objects that may obscure
your vision of a child or hazard.

Service

• Use extreme care in handling gasoline and other
fuels. They are extremely flammable and the vapors
are explosive.

• Use only an approved gasoline container.

• Never remove gas cap or add fuel while the engine
is running. Allow engine to cool at least two minutes
before refueling.

• Replace gasoline cap securely and wipe off any
spilled gasoline before starting the engine as it may
cause a fire or explosion.

• Extinguish all cigarettes, cigars, pipes and other
sources of ignition.

• Never refuel machine indoors because flammable
vapors will accumulate in the area.

• Never store the machine or fuel container inside
where there is an open flame or spark such as a gas
water heater, space heater, or furnace.

• Never run an engine inside a closed area.

• To reduce fire hazard, keep mower free of grass,
leaves, or other debris build-up. Clean up oil or fuel
spillage. Allow mower to cool at least 5 minutes
before storing.

• Before cleaning, repairing, or inspecting, make
certain the blade and all moving parts have
stopped. Disconnect the spark plug wire, and keep
the wire away from the spark plug to prevent
accidental starting.

• Check the blade and engine mounting bolts at
frequent intervals for proper tightness. Also, visually
inspect blade for damage (e.g., bent, cracked or
worn). Replace with blade which meets original
equipment specifications listed in this manual.

• Keep all nuts, bolts, and screws tight to be sure the
equipment is in safe working condition.

• Never tamper with safety devices. Check their
proper operation regularly.

• After striking a foreign object, stop the engine,
remove the wire from the spark plug, and
thoroughly inspect the mower for any damage.
Repair the damage before starting and operating
the mower.

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• Never attempt to make a wheel or cutting height
adjustment while the engine is running.

• Grass catcher components are subject to wear,
damage and deterioration, which could expose
moving parts or allow objects to be thrown. For
safety protection, frequently check components and

• Mower blades are sharp and can cut. Wrap the
blade(s) or wear gloves, and use extra caution
when servicing them.

• Do not change the engine governor setting or
overspeed the engine. Excessive engine speeds
are dangerous.

replace with manufacturer’s recommended parts,
when necessary.

Y our Responsibility

• Restrict the use of this power machine to persons who read, understand and follow the warnings and instru ctions in
this manual and on the machine.

1299 AC

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