MTD 12A-528F731 Owner’s Manual

Operator's Manual

22" Self-Propelled

Model Series 520

Mower

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 361131 Cleveland, Ohio 44136-0019.

MTD LLC, P.O. BOX 361131 CLEVELAND, OHIO 44136-0019

PRINTED IN U.S.A. FORM NO. 770-10349E

(12/03)

TABLEOFCONTENTS

Content

Important Safe Operation Practices
Slope Gauge
Assembling Your Lawn Mower

Know Your Lawn Mower
Operating Your Lawn Mower

Page Content Page

3 Making Adjustments 11
6 Maintaining Your Lawn Mower 12
7 Trouble Shooting 15

9 Illustrated Parts 16

10 Warranty 20

FINDINGMODELNUMBER

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. A sample model plate is
also given below. You can locate the model plate by standing at the operating position and
looking down at the rear of the deck. This information will be necessary to use the
manufacturer's web site and/or help from the Customer Support Department or an authorized

service dealer.

Copy the model number here:

P. O. BOX 3611131

CLEVELAND,OH 44136

', www.m{uprOuuc_s.com 888-888-7318

330-228-4683

Copy the serial number here:

CUSTOMERSUPPORT

Please doNOTreturntheunitto the retailer fromwhereit waspurchased,withoutfirstcontactingCustomerSupport.

If you have difficulty assembling this product or have any questions regarding the controls, operation or
maintenance of this unit, you can seek help from the experts. Choose from the options below:

Visit mtdproducts.com for many useful suggestions. Click on Customer Support button and
you will get the four options reproduced here. Click on the appropriate button and help is

immediately available.

answer you are

looking for could be just

a mouse c//cA awayf

If you prefer to reach a Customer Support Representative, please call 1-800-800-7310.

" f

answer are

looking for could be just

a mouse c//cA awayf

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En ine

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.

SECTION1: IMPORTANTSAFEOPERATIONPRACTICES

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.

GeneralOperation

1. 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 proper use of this

machine before operating it. Keep this manual in a safe
place for future and regular reference and for ordering
replacement parts.

2. This machine 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.

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. Only responsible individuals who are familiar with
these rules of safe operation should be allowed to use

this machine.

4. 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 tripped over or
picked up and thrown by the blade. Thrown objects can
cause serious personal injury. Plan your mowing pattern
to avoid discharge of material toward roads, sidewalks,
bystanders and the like. Also, avoid discharging material
against awalt or obstruction which may cause
discharged material to ricochet back toward the operator.

5. To help avoid blade contact or athrown object injury, stay
in the operator zone behind the handles and keep
children, bystanders, helpers and pets at least 75 feet

from the mower while it is in operation. Stop machine if

anyone enters the area.

6. Always wear safety glasses or safety goggles during
operation and while performing an adjustment or repair to
protect your eyes. Thrown objects which ricochet can
cause serious injury to the eyes.

7. Wear sturdy, rough-soled work shoes and close-fitting
slacks and shirts. Shirts and pants that cover the arms
and legs and steel-toed shoes are recommended. Never
operate this machine in bare feet, sandals, slippery or
light weight (e.g. canvas) shoes.

8. Do not put hands or feet near rotating parts or under the
cutting deck. Contact with the blade can amputate hands

and feet.

9. A missing or damaged discharge cover can cause blade
contact or thrown object injuries.

10. Many injuries occur as a result of the mower being pulled
over the foot during a fall caused by slipping or tripping.

Do not hold on to the mower if you are falling; release the

handle immediately.

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

a. Step back from the mower to fully extend your

arms.

b. Be sure you are welt balanced with sure footing.
c. Pull the mower back slowly, no more than halfway

toward you.

d. Repeat these steps as needed.

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

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

14. 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.

15. Never operate the mower inwet grass. Always be sure of
your footing. A slip and fall can cause serious personal

injury. If you feel you are losing your footing, release the
blade control handle immediately and the blade will stop
rotating within three seconds.

16. Mow only in daylight or in good artificial light. Walk, never
run.

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

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

19. Shut the engine off and wait until the blade comes to a

completestopbeforeremovingthegrasscatcheror
uncloggingthechute.Thecuttingbladecontinuesto
rotateforafewsecondsaftertheengineisshutoff.Never
placeanypartofthebodyinthebladeareauntilyouare
surethebladehasstoppedrotating.

20.Neveroperatemowerwithoutpropertrailshield,
dischargecover,grasscatcher,bladecontrolhandleor
othersafetyprotectivedevicesinplaceandworking.
Neveroperatemowerwithdamagedsafetydevices.
Failuretodoso,canresultinpersonalinjury.

21.Mufflerandenginebecomehotandcancauseaburn.Do
nottouch.

22.Onlyusepartsandaccessoriesmadeforthismachineby
themanufacturer.Failuretodoso,canresultinpersonal
injury.

23.Ifsituationsoccurwhicharenotcoveredinthismanual,
usecareandgoodjudgment.Contactyourdealerfor
assistance.Telephone[phone]forthenameof
yournearestdealer.

SlopeOperation

Slopes are a major factor related to slip and fall accidents
which can result in severe injury. Operation on slopes
requires extra caution. If you feel uneasy on a slope, do not
mow it. 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,

do not mow it.

Do:

1.

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

2. Watch for holes, ruts, rocks, hidden objects, or bumps

which can cause you to slip or trip. Tall grass can hide

obstacles.

3. Always be sure of your footing. A slip and fall can cause
serious personal injury. Ifyou feel you are losing your
balance, release the blade control handle immediately,
and the blade will stop rotating within 3 seconds.

DoNot:

1. Do not mow near drop-offs, ditches or embankments, you
could lose your footing or balance.

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

3. Do not mow on wet grass. Unstable 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. They do not understand the
dangers. Never assume that children will remain where you

last saw them.

1. Keep children out of the mowing area and under the

watchful care of a responsible adult other than the

operator.

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

3. Before and while moving backwards, look behind and
down for small children.

4. Use extreme care when approaching blind corners,

doorways, shrubs, trees, or other objects that may
obscure your vision of a child who may run into the

mower.

8,

Keep children away from hot or running engines. They
can suffer burns from a hot muffler.

6.

Never allow children under 14 years old to operate a
power mower. 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.

Service

Safe HandlingOfGasoline:

1. 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.

2. Wash your skin and change clothes immediately.

3. Use only an approved gasoline container.

4. Never fill containers inside a vehicle or on a truck or
trailer bed with a plastic liner. Always place containers on

the ground away from your vehicle before filling.

5. When practical, remove gas-powered equipment from
the truck or trailer and refuel it on the ground. Ifthis is not
possible, then refuel such equipment on a trailer with a
portable container, rather than from a gasoline dispenser

nozzle.

6. Keep the nozzle in contact with the rim of the fuel tank or
container opening at all times until fueling is complete. Do
not use a nozzle lock-open device.

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

8. Never fuel machine indoors because flammable vapors

wilt accumulate in the area.

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

10. Never over fill fuel tank. Fill tank to no more than ½ inch
below bottom of filler neck to provide space for fuel

expansion.

11. Replace gasoline cap and tighten securely.

12. If gasoline is spilled, wipe it off the engine and equipment.
Move unit to another area. Wait 5 minutes before starting
the engine.

13. Never store the machine or fuel container inside where
there is an open flame, spark or pilot light as on a water

heater, space heater, furnace, clothes dryer or other gas
appliances.

14. To reduce fire hazard, keep mower free of grass, leaves,
or other debris build-up. Clean up oil or fuel spillage and
remove any fuel soaked debris.

15. Allow a mower to cool at least 5 minutes before storing.

GeneralService:

1. Never run an engine indoors or in a poorly ventilated
area. Engine exhaust contains carbon monoxide, an
odorless and deadly gas.

2. Before cleaning, repairing, or inspecting, make certain
the blade and all moving parts have stopped. Disconnect
the spark plug wire and ground against the engine to
prevent unintended starting.

3. Checkthebladeandenginemountingboltsatfrequent
intervalsforpropertightness.Also,visuallyinspectblade

fordamage(e.g.,bent,cracked,worn)Replaceblade
withtheoriginalequipmentmanufacture's(O.E.M.)blade

only,listedinthismanual."Useofpartswhichdonot
meettheoriginalequipmentspecificationsmayleadto
improperperformanceandcompromisesafety!"

4. Mowerbladesaresharpandcancut.Wrapthebladeor

weargloves,anduseextracautionwhenservicingthem.

5. Keepallnuts,bolts,andscrewstighttobesurethe
equipmentisinsafeworkingcondition.

6. Nevertamperwithsafetydevices.Checktheirproper
operationregularly.

7. Afterstrikingaforeignobject,stoptheengine,disconnect
thesparkplugwireandgroundagainsttheengine.
Thoroughlyinspectthemowerforanydamage.Repair
thedamagebeforestartingandoperatingthemower.

8. Neverattempttomakeawheelorcuttingheight
adjustmentwhiletheengineisrunning.

9. Grasscatchercomponents,dischargecover,andtrail
shieldaresubjecttowearanddamagewhichcould
exposemovingpartsorallowobjectstobethrown.For
safetyprotection,frequentlycheckcomponentsand
replaceimmediatelywithoriginalequipment
manufacturer's(O.E.M.)partsonly,listedinthismanual.
"Useofpartswhichdonotmeettheoriginalequipment
specificationsmayleadtoimproperperformanceand
compromisesafety!"

10.Donotchangetheenginegovernorsettingoroverspeed
theengine.Thegovernorcontrolsthemaximumsafe
operatingspeedoftheengine.

11.Maintainorreplacesafetyandinstructionlabels,as
necessary.

12.Observeproperdisposaltawsandregulations.Improper
disposaloffluidsandmaterialscanharmthe

environment.

_, ARNING - YOUR RESPONSIBILITY: Restrict the use of this power machine to persons who read,

NOTE: Not all safety labels shown may apply to your lawn mower.

understand and follow the warnings and instructions in this manual and on the machine.

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WARNING

Do not mow on inclines with a slope in excess of 15 degrees (a rise of approximately 2-1/2 feet every 10feet). A riding mower could
overturn and cause serious injury. If operating a walk-behind mower on such a slope, it is extremely difficult to maintain your footing

o

and you could slip, resulting in serious injury.
Operate RIDING mowers up and down slopes, never across the face of slopes.
Operate WALK-BEHIND mowers across the face of slopes, never up and down slopes.

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SECTION3: ASSEMBLINGYOURLAWNMOWER

IMPORTANT:This unit is shipped without gasoline or oil
in the engine. Be certain to service engine with gasoline
and oil as instructed in the separate engine manual
before operating your mower.

NOTE: Reference to right or left hand side of the mower
is observed from the operating position.

RemovingUnitFromCarton

• Remove staples, break glue on top flaps, or cut
tape at carton end and peel along top flap to open

carton.

• Remove loose parts if included with unit (i.e.,
operator's manual, etc.)

• Carefully cut along corners, lay carton down flat,
and remove packing material.

• Roll or slide unit out of carton and check carton
thoroughly for loose parts.

DisconnectingSparkPlugWire

Before setting up your lawn mower, disconnect the
spark plug wire from the spark plug. See Figure 1.

To secure the upper and lower handle, tighten the
wing nuts near the top of lower handle (carriage

bolts must be seated properly into the
handle).Tighten the wing nuts at the end of the

lower handle to secure the handle to handle
bracket assemblies. See Figure 3.

NOTE: Your mower is shipped with the handle in the
higher position. If you wish to lower the height of the
handle, refer to the Adjustment Section.

Lower

Handle/

Bracket j /
Assembly

Figure 3

Fasten the cables to the lower handle with the

cable tie found on the lower handle. Pull the cable
tie tight and trim offthe excess. See Figure 4.

Spark Plug

Figure 1

SettingUpYourLawnMower

• Raise the lower handle, as shown in Figure 2
(Step1), until it snaps into place. Lift up and pull
back on the upper handle to raise the handle into
the operating position (Step 2). See Figure 2. Make
certain the lower handle is seated securely into the

handle bracket assemblies.

handle

,_1_2. Lift upper

1. Lift lower
handle

Cable Tie

Lower

Figure 4

If not there already, move rope guide to the first
hole above the lower handle on right side. The wing
nut loosens and secures the rope guide. See
Figure 5.

Starter. Handle
Rope

Nut

Rope
Guide

Lower
Handle

Figure 2

Figure 5

With the spark plug wire disconnected and
grounded, hold the blade control handle against the
upper handle, and pull the starter rope out of the
engine. Release the blade control handle. Slip the
starter rope into the rope guide. Tighten the wing

nut.

RemovingChuteRetainer

The chute deflector on your mower is held in an upright
position by a retainer for shipping purposes only.
Remove the retainer, following steps below, before
running the mower for the first time.

• Push the chute deflector up and towards the
engine. Holding the deflector in this position,
remove the retainer. See Figure 6.

• Lower the chute deflector carefully to its operating
position keeping your fingers out of the way.

Raise Chute
Deflector

NOTE: Install bottom lip inside chute opening

(indicated by I in the figure below) before placing hooks
over the hinge pin (indicated by 2 in the figure below).

Hing_

Pin

Chute
Deflector

Hooks

/

Retai ner

Figure 6

removed and discarded before operating

WARNING: The chute retainer must be
the mower.

InstallingMulchingBaffle

If your mower is equipped with the optional mulching
baffle, install it on the right side of the deck following

these instructions. Make sure to follow the correct
sequence as indicated here.

• Lift up and hold the side-discharge chute deflector.

• Insert bottom lip of the mulching baffle inside the
chute opening. See Figure 7.

• Snap hooks of the mulching baffle over the hinge
pin of the chute deflector. See Figure 7. The hooks
must snap into place on the hinge pin, locking the
mulching baffle firmly onto the mower. For a close-
up of the hinge pin location, see inset.

• Release the chute deflector.

Opening

Lip of Mulching Baffle

(install inside chute opening)

Figure 7

InstallingRearWheels

• Place the rear of the mower deck on raised blocks.

• Remove lock nut from pivot arm assembly, slide
wheel, with hollow side in, onto axle and secure

with lock nut. See Figure 8.
Assemble the other side in the same manner.

Nut

Figure 8

SECTION4: KNOWYOURLAWNMOWER

Read this operator's manual and safety rules before
operating your lawn mower. Compare the illustration in
Figure 9 with your lawn mower to familiarize yourself
with the location of various controls and adjustments.

Save this manual for future reference.

WARNING: The operation of any lawn
mower can result in foreign objects being
thrown into the eyes, which can damage
your eyes severely. Always wear safety
glasses while operating the mower, or
while performing any adjustments or
repairs on it.

EngineControls

See the separate engine manual for the location and
function of the controls on the engine.

BladeControlHandle

The blade control handle is located on the upper handle
of the mower. The blade control handle must be

depressed in order to operate the unit. Release blade
control handle to stop engine and blade.

WARNING: This blade control mechanism
is a safety device. Never attempt to bypass

its operations

RecoilStarter

The recoil starter is attached to the right lower handle.

Stand behind the unit and pull the recoil starter to start

the unit. See Figure 9.

CuttingHeightAdjustmentLevers

These levers are located on each wheel and they are

used to adjust the cutting height. All four levers have to
be at the same relative position to ensure auniform cut.
See Figure 9.

DriveControl Handle

The drive control handle is located on the upper handle.

Squeeze the drive control handle against the upper
handle to engage drive system. Release the control
handle to disengage the drive system in order to stop,
slow down, or backup.

StoppingEngine

• Release blade control handle to stop the engine
and the blade.

• Disconnect spark plug wire and ground it to a bolt
on the engine.

Starter

Blade Control
Handle

Handle

Mulching
Plug

Cutting Height
Adjustment

Discharge
Chute

Figure 9

SECTION5: OPERATINGYOURLAWNMOWER

TowardsBetterMowerPerformance

1. Pour fresh, clean gasoline into the mower's gas 5.
tank until the tank is full. Do not use gasoline

that is more than 30 days old. 6.

2. Make sure to connect the mower's spark plug
wire before trying to start the engine.

3. Add engine oil to the oil fill on the mower engine. 7.
Check the dipstick and add more if necessary.

Remember that the oil level has to touch the fill
line. 8.

4. Locate the primer decal near the primer bulb on
the engine, and read its instruction. Using your 9.
thumb, press the primer bulb slowly as many

times as the decal advises.

WARNING: Keep hands and feet away from
chute area on the cutting deck. The
operation of any lawn mower can result in
foreign objects being thrown into the eyes,
which can result in severe eye damage.
Always wear safety glasses or eye shields.

NOTE: For shipping purposes your mower is set with

the wheels in a low cutting height position. For best
results raise the cutting position until it is determine
which height is best for your lawn. See the Adjustment

Section for details.

GasandOilFill-Up

Service the engine with gasoline and oil as instructed in
the separate engine manual packed with your mower.
Read instructions carefully.

engine running or until the engine has

WARNING: Never fill fuel tank indoors with
been allowed to cool for at least two

minutes after running.

Hold control handle down and pull rope firmly to
start the engine.

Set cutting height adjustment lever to middle
setting and mow a single pass on your lawn;

then adjust to desired height for a closer cut.
To mulch insert the mulch plug/cover on the

mower.
Before storing the lawn mower for the winter,

use stabilizer-treated fuel and run the tank dry.

Thirty days before start of the new season,

check the air filter, spark plug and blade on the
lawn mower, and replace if needed.

J

StartingEngine

• Prime engine as instructed in the separate engine
manual packed with your unit.

• Your lawn mower is equipped with a constant

speed throttle, which is set at full throttle for best

performance.

• Stand behind the mower and squeeze the blade

control handle against the upper handle.

• Grasp recoil starter handle and pull rope out slowly
until engine reaches the start of compression cycle
(rope will pull slightly harder at this point). Let the
rope rewind slowly. Pull rope with a rapid,

continuous, full arm stroke. Keeping afirm grip on
the starter handle, let the rope return to the starter
slowly.

StoppingEngine

• Release blade control handle to stop the engine

and the blade.

• Disconnect spark plug wire and ground it to a bolt

on the engine.

BeforeStartingYourMower

• Attach spark plug wire to spark plug. Make certain
the metal cap on the end of the spark plug is

fastened securely over the metal tip on the spark

plug.

10

UsingYourLawnMower

Be sure that the lawn is clear of stones, sticks, wire, or
other objects which could damage the lawn mower or

the engine. Such objects could be accidently thrown by
the mower in any direction and cause serious personal
injury to the operator and others.

For best results, do not cut wet grass because ittends
to stick to the underside of the mower, preventing
proper discharge of grass clippings, and could cause
you to slip and fall. New grass, thick grass, or wet grass
may require a narrower cut.

For a healthier lawn, never cut off more than one-third
of the total length of the grass. Your lawn should be cut

in the fall as long as there is growth. This mower is
designed to be operated at full throttle to give you the
best cut and do the most effective job of mowing or
mulching.

SECTION6: MAKINGADJUSTMENTS

WARNING: If you strike a foreign object,
stop the engine. Remove wire from the
spark plug, thoroughly inspect the mower
for any damage, and repair the damage
before restarting and operating the

mower. Extensive vibration of the mower
during operation is an indication of

damage. The unit should be promptly
inspected and repaired.

Mulching

For effective mulching, do not cut wet grass because it

tends to stick to the underside of the deck, preventing

proper mulching of grass clippings. New or thick grass
may require a narrower cut. The ground speed should
be adjusted to the condition of the lawn. Ifmowing has
been delayed and the grass has been allowed to grow
in excess of 4", mulching is not recommended. Mow
using the side discharge to reduce the grass height to 3
114"maximum before mulching.

_, WARNING: Do not at any time make any

adjustments without first stopping engine
and disconnecting spark plug wire.

CuttingHeightAdjustment

Each wheel has a height adjustment lever which
provides cutting height adjustment. When the
adjustment lever is moved from one location to another
the height of cut will be changed. Simply depress the
lever towards wheel and move lever assembly to
desired position. See Figure 10.

IMPORTANT:All wheels must be placed inthe same
relative position. For rough or uneven lawns, move the
height adjustment lever to a higher position. This will
help stop scalping of the grass.

HandleHeightAdjustment

Your mower is shipped with the handle in the higher

height position. To lower the height proceed as follows:

• Remove the starter rope from the rope guide.

• Disconnect the handle from the handle bracket
assemblies by removing the wing nuts.

See Figure 11.

• Position each handle bracket assembly stud into
one of the other holes inthe lower handle.

• Each end of the lower handle must be placed in
same relative position.

• Reassemble wing nuts and place starter rope back

into the rope guide.

Nuts

Lower"
Handle

Handh
Bracket

Assemblies

Height

Adjustment Lever

Figure 10

Figure 11

EngineAdjustments

See the separate engine manual packed with your unit

for adjustments to the engine.

11

SECTION7: MAINTAININGYOURLAWNMOWER

CustomerResponsibilities

£

MAINTENANCE Qeo<"

SCHEDULE

<4/ ,,4, _ ,,J ",u

Lubricate Wheels

t---

© Lubricate Blade Control

_) Clean Deck
n_

a_ Blade Care

Check Oil
Change Oil

7m Replace Air Filter

0 Clean Engine
ua

Check Spark Plug
Check SparkArrester (if any)

GeneralRecommendations

• Always observe safety rules when performing any
maintenance.

• Changing of engine governed speed will void
engine warranty.

• The warranty on this lawn mower does not cover
items that have been subjected to operator abuse

or negligence. To receive full value from the
warranty, operator must maintain the lawn mower

as instructed in this manual.

• Some adjustments will have to be made
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 under Customer
Responsibilities to get quality performance from

your lawn mower.

o o-"

SERVICE

DATES

Lubrication

disconnect spark plug wire before

WARNING: Always stop engine and

cleaning, lubricating or doing any kind of

service work on the lawn mower.

Blade Control Handle and Drive Clutch Control:

Lubricate the pivot points on the blade control handle
and the drive clutch control at least once a season with

light oil. These handles must operate freely in both
directions. See Figure 12.

Wheels: Lubricate the wheels at least once a season
with light oil (or motor oil). If the wheels are removed for

any reason, lubricate the surface of the pivot arm axle
and inner surface of the wheel with light oil.

Chute Deflector or Mulching Baffle: Lubricate the

torsion spring and pivot point periodically with light oil to

prevent any rust or binding.
Engine: Follow the separate engine manual packed

with your unit for lubrication instructions.

12

IMPORTANT:We do not recommend the use of a
pressure washer or garden hose to clean your unit.

CuttingBladeRemoval,Replacement,and Sharpening

Lubricate

Figure 12

Maintenance

NOTE: When tipping the unit or emptying the fuel tank

keep the air cleaner side of engine up. Never tip the
mower more than 90 degrees and do not leave the
mower tipped for any length of time. Oil can drain into
the upper part of the engine causing a starting problem.

WARNING: When removing the cutting blade for
sharpening or replacement, protect your hands
with a pair of heavy gloves or use a heavy rag to

hold the blade.

• Remove the bolt and the blade bell support which
hold the blade and the blade adapter to the engine

crankshaft. See Figure 13.

• Remove the blade and the adapter from the

crankshaft.

Blade Bell
Support

Bolt

Figure 13

Engine

Refer to the separate engine manual for all engine
maintenance instructions.

• Maintain engine oil as instructed in the separate
engine manual packed with your unit.

• Service air cleaner every 25 hours under normal
conditions. Poor engine performance and flooding
usually indicate that the air cleaner should be

serviced. To service the air cleaner, refer to the
separate engine manual packed with your unit.

• The spark plug should be cleaned and the gap
reset once a season. Spark plug replacement is
recommended at the start of each mowing season.

Clean the engine regularly with a cloth or brush. Keep
the cooling system (blower housing area) clean to
permit proper air circulation which is essential to engine
performance and life. Be certain to remove all grass,

dirt, and combustible debris from muffler area.

Deck

The underside of the mower deck should be cleaned
after each use to prevent a buildup of grass clippings,

leaves, dirt, or other matter. If this debris is allowed to
accumulate, it will invite rust and corrosion, and may

prevent proper mulching, discharge, or bagging. The
deck may be cleaned by tilting the mower and scraping
clean with a suitable tool (make certain the spark plug
wire is disconnected).

,_ WARNING: Periodically inspect the blade

IMPORTANT:When sharpening the blade, follow the

original angle of grind as a guide. It is extremely

important that each cutting edge receives an equal
amount of grinding to prevent an unbalanced blade. An

unbalanced blade will cause excessive vibration when
rotating at high speeds. It may cause damage to the

mower, and could break causing personal injury.

• The blade can be tested by balancing iton a round

• Before reinstalling the blade and the blade adapter

• Be sure to install the blade with end tips facing up

• Slide the blade adapter onto the engine crankshaft.

• Place the blade on the adapter. Be certain the

adapter for cracks, especially if you strike
a foreign object. Replace when necessary.

shaft screwdriver. Remove metal from the heavy
side until it balances evenly. It is recommended that
the blade always be removed from the adapter
when testing for balance.

to the unit, lubricate the engine crankshaft and the
inner surface of the blade adapter with light oil.

or the side of the blade marked "Bottom" (or with
part number) facing the ground when the mower is
in the operating position.

blade is aligned and seated on the blade adapter
flanges.

13

• Place blade bell support on blade. Make sure the
notches on the blade bell support are aligned with

small holes in the blade.

• Replace hex bolt and tighten hex bolt to torque: 450
in. Ibs. min., 600 in. Ibs. max.

Loosen this screw

NOTE: To ensure safe operation of your mower, the
blade bolt must be checked periodically for correct
torque.

DriveBeltRemovalAndReplacement

• Disconnect the spark plug wire and ground it
against the engine.

• Drain the fuel tank or place a piece of plastic
beneath the cap to prevent gasoline leakage.

• If unit is tipped for easier access to belt, tip the
mower back on its side with the air filter side away

from the ground.

Transmission
Cover

4

Shoulder
Screw

_Transmission

Figure 15

• Slide the belt off the engine pulley and around the
blade. See Figure 16.

Right Front Left Front

Wheel Wheel

Plastic

Figure 14

• To get easier access to the belt, just securely place
the mower on raised blocks.

• Remove the transmission cover by sliding off the
two plastic rivets with a screwdriver on each side of
cover. See Figure 14.

• Using a torque wrench, loosen the screw holding
the belt tension spring to the transmission. See
Figure 15.

• Do not remove the screw completely, as you loosen
the screw the tension on the belt will be released.

• Push the transmission up a little and slide the belt
off the transmission pulley.

• Lift the mower to access the belt from the underside
of the mower.

Engine

Pulley

Figure 16

WARNING: As always, use a thick piece of rag to

handle the blade while sliding the belt around it.
Make sure the spark plug is disconnected and
grounded for this job.

• Replace with the new belt, working around the
blade. Make sure the belt is firmly seated on the

engine pulley while pulling from the other side and
sliding it around the transmission pulley.

• Put the mower down with all four wheels firmly
placed on one level.

• Tighten the screw, loosened earlier, to secure the
belt tension spring to the transmission, and

reassemble the front drive cover.

14

0ff-SeasonStorage

The following steps should be taken to prepare your
lawn mower for storage.

• Clean and lubricate mower thoroughly as described
in the lubrication instructions.

IMPORTANT:We do not recommend the use of a
pressure washer or garden hose to clean your unit.

• Refer to engine manual for correct engine storage
instructions.

• Coat mower's cutting blade with chassis grease to
prevent rusting.

• Store mower in a dry, clean area. Do not store next

to corrosive materials, such as fertilizer.

NOTE: When storing any type of power equipment in a

poorly ventilated or metal storage shed, care should be

taken to rust-proof the equipment. Using a light oil or
silicone, coat the equipment, especially cables and all
moving parts.

SECTION8: TROUBLESHOOTING

Problem Cause Remedy

Engine fails to start

Engine runs erratic

Engine overheats

Idles poorly

Excessive vibration

Mower will not mulch grass

Uneven cut

Wheels will not propel

NOTE: For repairs beyond the minor adjustments fisted above, contact your nearest authorized service dealer.

1. Blade control handle disengaged.

2. Spark plug wire disconnected.

3. Fuel tank empty or stale fuel.

4. Blocked fuel line.

5. Faulty spark plug.

6. Engine flooded.

1. Spark plug wire loose.

2. Blocked fuel line or stale fuel.

3. Vent in gas plugged.

4. Water or dirt in fuel system.

5. Dirty air cleaner.

6. Carburetor out of adjustment.

1. Engine oil level low.

2. Air flow restricted.

3. Carburetor not adjusted properly.

1. Spark plug fouled, faulty or gap too
wide.

2. Carburetor improperly adjusted.

3. Dirty air cleaner.

1. Cutting blade loose or unbalanced.

2. Bent cutting blade.

1. Wet grass.

2. Excessively high grass.

3. Dull blade.

1. Wheels not positioned correctly.

2. Dull blade.

1. Belt not installed properly.

2. Debris clogging drive operation.

1. Engage blade control handle.

2. Connect wire to spark plug.

3. Fill tank with clean, fresh gasoline.

4. Clean fuel line.

5. Clean, adjust gap, or replace.

6. Wait a few minutes to restart, but do not
prime.

1. Connect and tighten spark plug wire.

2. Clean fuel line; fill tank with clean, fresh
gasoline.

3. Clear vent.

4. Drain fuel tank. Refill with fresh fuel.

5. Clean air cleaner.

6. Adjust carburetor.

1. Fill crankcase with proper oil.

2. Remove blower housing and clean.

3. Adjust carburetor.

1. Reset gap to.030" or replace spark
plug.

2. Adjust carburetor.

3. Clean air cleaner.

1. Tighten blade and adapter. Balance
blade.

2. Replace blade.

1. Do not mow when grass is wet; wait
until later to cut.

2. Mow once at a high cutting height, then
mow again at desired height or make a
narrower cutting path.

3. Sharpen or replace blade.

1. Place all four wheels in same height
position.

2. Sharpen or replace blade.

1. Check belt for proper pulley installation
and movement.

2. Clean out debris.

15

SECTION9: PARTSLISTFORMODELSERIES520

12

54

22

63 64

25

31

40

16

ModelSeries520

Ref,

No,

1.

2.

3.

4.

5.

6.

7.

10.

11.

12.

13.

14.

15.

16.

17.

18.

20.

21.

22.

23.

24.

25.

26.

27.

28.

29.

30.

31.

32.

33.

Part No.

747-1214
747-1161A

746-1113
746-1132
746-1114

746-04048
749-1092A
710-1205

720-0279
710-1174
736-0451

720-0284
749-04037
725-0157

17098
731-2537
710-0599

682-3062A
712-0431
682-3063A

687-02046
710-0654A

754-04003
782-0585A
728-0199
750-04120

716-0198
618-04025

750-04119
731-0073
748-04016A
742-0742A

Part Description

Drive Control Handle
Blade Control Handle

Blade Control Cable - 37.75"
Blade Control Cable - 40.75"
Blade Control Cable- 50.5"

Drive Control Cable
Upper Handle

Eye Bolt

Wing Nut 1/4-20

Carriage Bolt 5/16-18 x 2.0
Shoulder Washer.320 ID x.93 OD

Wing Nut

Lower Handle
Cable Tie

Hinge Clip

Trail Shield

Hex Screw 1/4-20 x.500
Handle Bracket Assembly - RH

Lock Nut 3/8-16
Handle Bracket Assembly- LH

22" Deck Assembly

Hex Washer Screw 3/8-16 x 1.0

V-Belt

Forward Height Adjustment Plate - LH
Rivet

Sleeve Spacer.550 ID x 3.3
Retainer Ring
Transmission Assembly Complete
Sleeve Spacer.550 ID x 7.95

Transmission Cover

Blade Adapter

22" Mulching Blade

Ref.

No,

34.

35.

36.

38.

39.

40.

41.

42.

43.

45.

46.

47.

48.

49.

50.

51.

52.

53.

54.

55.

57.

58.

59.

60.

61.

62.

63.

64.

Part No.

736-0524A
710-1044

782-0584
710-0514

720-0426
682-0544
682-0545

731-2522

715-0221

717-1762

717-1761
634-0190

747-0710

732-1014

731-1034B

736-0270

17032A

710-0216

741-0717

732-0984B
687-02080

687-02079

738-1127

734-04082
631-04045

748-0390

716-0865

736-0105

712-0130

710-04121

732-04049

Part Description

Bell Blade Support
Hex Cap Screw 3/8-24 x 1.5
Forward Height Adjustment Plate - RH
Hex Cap Screw 3/8-16 x 1.00
Adjustment Knob
Spring Lever Assembly- RH (FWD)
Spring Lever Assembly- LH (FWD)

Wheel Dust Cover
Pin

Spur Gear 14T- RH
Spur Gear 14T- LH

Front Wheel 8 x 1.8
Hinge Pin

Torsion Spring
Side Discharge Assembly

Belt Washer.265 ID x.75 OD
Deflector Chute Adapter

Hex Cap Screw 3/8-16 x.75
Thrust Bearing.688 ID x 1.938 OD
Spring Lever
Rear Pivot Arm Assembly - RH
Rear Pivot Arm Assembly - LH

Shoulder Screw 3/8-16
Rear Wheel 12 x 1.8

Snap Mulching Plug
Bearing Support Spacer
Snap Ring.500

Bell Washer.375 x.870 x.063
Hex Lock Nut 3/8-16

Screw (Included with Item #29)
Extension Spring.47 OD x 2.50

17

NOTES

18

NOTES

19

MANUFACTURER'S LIMITED WARRANTY FOR:

The limited warranty set forth below is given by MTD LLC with
respect to new merchandise purchased and used in the
United States, its possessions and territories.

"MTD"warrants this product against defects in material and
workmanship for a period of two (2) years commencing on the
date of original purchase and wilt, 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 part, accessory or attachment not
approved by MTD for use with the product(s) covered by this
manual will void your warranty as to any resulting damage.

Normal wear parts are warranted to be free from defects in
material and workmanship for a period of thirty (30) days from
the date of purchase. Normal wear parts include, but not
limited to items such as: 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 MTD LLC at P.O. Box 361131,
Cleveland, Ohio 44136-0019, or call 1-800-800-7310 or 1-
330-220-4683 or tog on to our Web site at
www.mtdproducts.com.

This limited warranty does not provide coverage in the
following cases:

a,

The engine or component parts thereof. These items

may carry a separate manufacturer's warranty. Refer
to applicable manufacturer's warranty for terms and

conditions.

b,

Log splitter pumps, valves, and cylinders have a

separate one year warranty.

C.

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.

d,

Service completed by someone other than an

authorized service dealer.

e,

MTD does not extend any warranty for products sold or

exported outside of the United States, its possessions
and territories, except those sold through MTD's
authorized channels of export distribution.

f,

Replacement parts that are not genuine MTD parts.
Transportation charges and service calls.

g.

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 MTD. 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. MTD
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 awarranted
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 toss, 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.

IMPORTANT:Owner must present Original Proof of
Purchase to obtain warranty coverage.

MTD LLC, P.O.BOX361131CLEVELAND,OHIO44136-0019;Phone:[phone]