MTD YARD-MAN 999 User manual

IMPORTANT: Read safety rules and instructions carefully before operating equipment.
MTD PRODUCTS INC. P.O. BOX 368022 CLEVELAND, OHIO 44136-9722
21-inch, 6-Speed
Lawn Mower
Models 999 & E999
PRINTED IN U.S.A.
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 368022 Cleveland, Ohio 44136-9722.
Operator’s Manual
FORM NO.
770-10076B.fm
(11/00)
ECO # 2844

2
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 Lawn Mower .............................................................................10
Making Adjustments ..........................................................................................12
Maintaining Your Lawn Mower...........................................................................14
Service...............................................................................................................15
Off-Season Storage...........................................................................................17
Troubleshooting.................................................................................................18
Parts List............................................................................................................20
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 behind the unit in the operating position and looking
down at the cutting 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.
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 Support Department.
Call 1- (330)-220-4MTD or 1- (800)-800-7310to reach a Customer Support representative.
Please have your unit’s model number and serial number ready when you call. See previous
section to locate this information. You will be asked to enter the serial number in order to
process your call.
Copy the model number here:
Copy the serial number here:
(Model Number) (Serial Number)
MTD PRODUCTS INC
CLEVELAND, OHIO 44136
P.O. BOX 368022

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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 instruc-
tions could result in serious injury or death.
General Operation
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,
notaplaything. Therefore, exercise extreme cautionatall
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 safe operation rules should 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
againstawallorobstructionwhichmaycausedischarged
material to ricochet back toward the operator.
5. Tohelpavoid blade contact or athrown object injury, stay
in the operator zone behind the handles and keep
bystanders, helpers, children and pets at least 75 feet
from the machine 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 well balanced with sure footing.
c. Pullthemowerbackslowly, no more than half way
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 in wet 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 in daylight or good artificial light. Walk, never run.
17. Stop the blade when crossing gravel drives, walkways
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
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.
20. Never operate mower without proper trail shield,
discharge cover, grass catcher, blade control handle or

4
other safety protective devices in place and working.
Never operate mower with damaged safety devices.
Failure to do so, can result in personal injury.
21. Mufflerandengine become hot and cancause a burn. Do
not touch.
22. Onlyuse parts and accessories made for thismachine by
the original equipment manufacturer (O.E.M). Failure to
do so can result in personal injury.
23. 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
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. Before operating this unit on a slope or hilly area, use
the slope gauge on page 6 to measure slopes . 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. If you 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.
5. 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 Handling of Gasoline:
1. Toavoidpersonalinjuryorpropertydamageuse 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. If possible, remove gas-powered equipment from the
truck or trailer and refuel it on the ground. If this 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
containeropeningatalltimesuntilfuelingiscomplete.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
will 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. Check the blade and engine mounting bolts at frequent
intervals for proper tightness. Also, visually inspect blade
for damage (e.g., bent, cracked, worn) Replace blade
withthe original equipment manufacture’s (O.E.M.)blade
only, listed in this manual. “Use of parts which do not

5
meet the original equipment specifications may lead to
improper performance and compromise safety!”
4. Mower blades are sharp and can cut. Wrap the blade or
wear gloves, and use extra caution when servicing them.
5. Keep all nuts, bolts, and screws tight to be sure the
equipment is in safe working condition.
6. Never tamper with safety devices. Check their proper
operation regularly.
7. Afterstriking a foreign object, stopthe engine, disconnect
the spark plug wire and ground against the engine.
Thoroughly inspect the mower for any damage. Repair
the damage before starting and operating the mower.
8. Never attempt to make a wheel or cutting height
adjustment while the engine is running.
9. Grass catcher components, discharge cover, and trail
shield are subject to wear and damage which could
expose moving parts or allow objects to be thrown. For
safety protection, frequently check components and
replace immediately with original equipment
manufacturer’s (O.E.M.) parts only, listed in this manual.
“Use of parts which do not meet the original equipment
specifications may lead to improper performance and
compromise safety!”
10. Do not change the engine governor setting or overspeed
the engine. The governor controls the maximum safe
operating speed of the engine.
11. Maintain or replace safety and instruction labels, as
necessary.
12. Observe proper disposal laws and regulations. Improper
disposal of fluids and materials can harm the
environment.
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.
1299 AC

6
SECTION 2: SLOPE GAUGE
Use this page as a guide to determine slopes where you may not operate the lawn mower safely.
15°
SIGHTAND HOLDTHISLEVELWITHAVERTICALTREE
APOWERPOLE
ACORNEROFABUILDING ORAFENCEPOST
FOLDONDOTTEDLINE,REPRESENTINGA15°SLOPE
USE THISPAGEASAGUIDETODETERMINESLOPES WHEREYOUMAYNOTOPERATESAFELY.
Donotmowon inclineswithaslope inexcess of15 degrees(ariseofapproximately2-1/2feetevery10 feet).A
riding mowercouldoverturnand causeseriousinjury.If operating awalk-behind moweron suchaslope,itis extremelydifficulttomaintainyourfooting and you couldslip,resulting inseriousinjury.
OperateRIDINGmowersup and downslopes,neveracross the faceofslopes. OperateWALK-BEHIND mowersacross the faceofslopes,neverup and downslopes.
WARNING

7
SECTION 3: ASSEMBLING YOUR LAWN MOWER
Unpacking
•Remove staples, break glue on top flaps, or cut
tape at carton end and peel along top flap to open.
•Remove loose parts if included with unit (i.e.,
operator’s manual, hardware pack etc.).
•Cut corners and lay carton down flat. Remove
packing material.
•Roll or slide unit out of carton. Check for loose parts
thoroughly before discarding carton.
Hardware Pack
Please identify each piece of the hardware pack as
shown in Figure 1.
Figure 1
Tools Required
1. Pair of Pliers
2. Funnel
NOTE: Reference to right or left hand side of the mower
is from the operating position.
IMPORTANT: This unit is shipped WITHOUT
GASOLINE OR OIL in the engine. Be certain to service
engine with fresh gasoline and oil as instructed in the
engine manual. the engine manual is packed
seperately inthe carton.
Disconnect Spark Plug Wire
•Disconnect the spark plug wire from the spark plug,
and ground it against the engine by attaching
rubber boot to a bolt. See Figure 2.
Figure 2
Assembling Handle
•For shipping purposes, the grass bag was packed
on top of the unit. Remove the grass bag and set it
out of the way.
•Pull the upper handle upwards in the direction
shown in Figure 3. Align it with the lower handle.
•Tightenwing nut securingtheupper handle with the
lower handle on each side.
Figure 3
•Raise complete handle assembly, as shown in
Figure 4, until it clicks into place. Make sure not to
kink the control cables.
Figure 4
•Pinch lower handle against the handle mounting
bracketwith a pair ofpliers.Move hairpin clip fromthe
outer to the inner hole of the weld pin on the handle
mounting bracket on each side. See Figure 5.
Wing Nut
Carriage Bolt
1/4-20 (2)
1/4-20 (2)
Spark Plug Wire Spark Plug
Upper
Handle
Carriage
Bolt
Wing
Nut
Wing
Nut
Lower
Handle
Handle
Assembly

8
Figure 5
•After you have moved the hairpin clips, place one
carriage bolt (included in the hardware pack) in the
upper hole of the right handle mounting bracket
from the inside outward. See Figure 6. Secure with
one plastic wing nut. Repeat process on the left.
Figure 6
•Attach control cables to handle by inserting post of
cable ties into the holes on the lower handle. The
holes may be on either side of the handle. Pull
cable ties tight and cut off the extra. See Figure 7.
Figure 7
NOTE: Make sure the drive cable is routed around the
outside and above the lower handle so as not to
interfere with the grass bag attachment.
•The rope guide, which is connected to the support
rod, is located on the right side of the lower handle.
See Figure 8.
•With the spark plug wire disconnected and
grounded,holdthebladecontrolhandleagainstthe
upper handle, and pull the starter rope out of the
engine. Release the blade control handle. Slip the
starter rope into the rope guide. See Figure 8.
Figure 8
Handle Mounting
Bracket
Lower
Handle
Hairpin
Clip
Inner Hole
Wing Nut
Carriage
Upper
Hole
Hairpin Clip
Bolt
Cable Tie
Lower
Handle
Starter
Rope
Rope
Guide
Lower
Handle
Support
Rod

9
SECTION 4: KNOW YOUR LAWN MOWER
Compare the illustrations in Figure 9 with your lawn mower to acquaint yourself with the location and working of
various controls and adjustments on the equipment. Always wear safety glasses while performing any adjustments
on the mower.
Figure 9
Blade Control Handle
Theblade control handle is located on theupper handle
of the mower.
•Depress the blade control handle in order to start
and operate the unit.
•Releasethebladecontrolhandletostoptheengine
and the blade.
WARNING: The blade control handle is a
safety device. Never attempt to bypass its
operations. The blade will be rotating
whenever the engine is running.
Throttle Control/Choke Lever
The engine is equipped with a constant speed throttle,
which is already set at full throttle for best performance.
Recoil Starter
The recoil starter handle is attached to the lower
handle. See .
•Stand behind the unit in the operating position to
start the unit.
Drive Clutch Control
The drive clutch control lever is the longer of the two
levers located in a seperate housing attached to the top
of the upper handle. See for its location.
•Squeeze the drive clutch control to engage the
drive system; release the clutch control to
disengage.
•Release the drive clutch control to slow down when
negotiating an obstacle, making a turn or stopping.
Shift Lever
The shift lever is the shorter of the two levers located in
the drive clutch control housing on the upper handle.
See .
•Use this lever to select any of the six forward
speeds available on this mower model. Note that
when sliding the lever up or down to change speed
selection, you will have to release the drive clutch
control lever.
NOTE: Move the shift lever only when the engine is
running. Changing the shift lever setting with the engine
off can cause damage to the mower’s drive system.
CasterLock
WARNING: When operating mower on
hills, front wheels should be locked in the
straight ahead position.
The casters can be locked in a straight ahead position
or can be left to swivel freely.
•Lift and place the lock pins in the larger holes to
lock the wheels for straight-ahead operation.
•Placepinsin smaller holes to allow casters to rotate
freely for turning.
Engine Controls
Refer to the engine manual for location and function of
the controls located on the engine.
Recoil Starter
Blade Control Handle
Drive Clutch Control
Cutting Height
Shift Lever Adjustment Lever
Front Wheel
Caster Locks
Front Wheel
Height Adjuster

10
SECTION 5: OPERATING YOUR LAWN MOWER
Gas and Oil Fill-Up
•Service the engine with gasoline and oil as
instructed in the accompanying engine manual.
Follow all instructions carefully.
WARNING: Never fill fuel tank indoors,
with engine running or until the engine has
been allowed to cool for at least two minutes
after running.
Before Starting
ElectricStart Units:
WARNING: The battery contains corrosive
fluid and toxic material; handle with care.
Keep away from children. Do not puncture,
disassemble, mutilate or incinerate the
battery. Explosive gases could be vented
during charging or discharging. Use the
battery in a well-ventilated area and away
from sources of ignition.
Battery Charging: Charge battery for approximately
16 hours before initial use. However, do not charge
longer than 20 hours.
IMPORTANT: Use only the battery charger supplied with
this mower.
Figure 10
•To charge battery, (1) remove the protective cap
from the end of the battery pack lead; (2) plug
charger lead into battery pack lead; and (3) insert
battery charger plug into 120 volt standard
householdoutlet. See Figure 10. It is veryimportant
to follow this order of action for proper charging.
•After charging, disconnect battery charger plug
fromhouseholdoutletfirst, then disconnect charger
lead from battery pack lead.
WARNING: Do not remove the battery
pack from the handle panel for any reason
other than replacement. When replacing the
battery pack, refer to page 15.
All Units:
•Attach spark plug wire to spark plug. Make certain
the metal cap on the end of the spark plug wire
(inside the rubber boot) is fastened securely over
the metal tip on the spark plug.
•Check the drive clutch control for proper
adjustment. If the mower does not propel itself or
the drive wheels hesitate with the drive clutch
engaged, perform the drive clutch control
adjustment as instructed on page 16.
Starting Engine
WARNING: Be sure no one other than the
operator is standing near the lawn mower
while starting engine or operating mower.
Never run engine indoors or in enclosed,
poorly ventilated areas. Engine exhaust
contains carbon monoxide, an odorless and
deadly gas.
Keep hands, feet, hair and loose clothing
away from any moving parts on engine and
lawn mower.
When starting the unit for the first time, face
the mower against a solid object such as a
wall, fence, etc. Start the unit and if it shows
any signs of motion while the drive clutch
control is still disengaged, shut the engine off
immediately.
•Make sure that the drive clutch control is adjusted
so the drive belt is as loose as possible.
•Move throttle control lever (if equipped) toward the
“rabbit” position.
•Push the primer three times. Wait two seconds
between each push. In temperatures below 55° F,
prime five times. Do not prime to restart a warm
engine after a short shutdown.
•Standing behind the mower, depress the blade
control handle and hold it against the upper handle.
•Electric Start: Turn ignition key to the right to start
the engine. Release key after the engine starts.
•Recoil Start: Grasp starter handle and pull rope
outslowly untilengine reaches startof 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 a firm grip on
the starter handle, let the rope rewind slowly.
Cap
Charger
Lead
Charger
Plug
Battery
Pack

11
Stopping Engine and Blade
•Releasethebladecontrolhandletostoptheengine
and blade.
WARNING: The blade continues to rotate
for a few seconds after the engine is shut off.
Neutral Adjustment Test
•Toperformthistest,answerthefollowingquestions
after having started the mower and engaged the
drive clutch control:
1. With the engine OFF and the drive clutch
control released, push mower forward and pull
it backward. Does it move freely?
2. Squeeze drive clutch control and pull the
mower backward. Do rear wheels lock up?
3. Is the drive clutch control cable free of kinks or
sharp bends?
•If you answered “yes’ to all three questions, your
mower passed the test and you can start your
mower. If you answered “no” to any of the three
questions, you need to perform the “Drive Clutch
Control Adjustment” as instructed on page 13.
Locking Casters
IMPORTANT: If you are cutting grass on a slope, always
lock the front wheel casters of your mower for straight
ahead operation. On level ground you may leave the
casters unlocked to pivot freely.
Figure 11
•To turn the mower on a slope with casters locked,
depress the upper handle and raise the front
wheels slightly.
•To lock caster: Lift and place the lock pin in the
larger hole on each caster. See Figure 11.
•To unlock caster: Lift and place the lock pin in the
smaller hole to allow casters to rotate freely. See
Figure 11.
WARNING: Do not mow on slopes with
casters unlocked since the mower can drift
downhill.
Bagging Grass Clippings
This mower can bag grass clippings. For that, you will
have to install the grass bag on to the unit.
•Remove the three wing nuts holding the mulching
baffle or side discharge chute in place. Then
remove the plug or the chute as the case may be.
See Figure 12.
Figure 12
•Replace with bagging adapter. Attach using three
wing nuts removed earlier. Be sure that inner lip of
attachment goes under the edge of the deck. See
Figure 13.
Figure 13
•Lift chute door and slide bag onto adapter. Top of
bag rests on wire bracket that extends between the
handles. See Figure 14.
Figure 14
Emptying Your Grass Bag
•Lift grass bag from the bagging adapter using the
lower handle of the grass bag. While holding the
lower handle, lift up the rear section of the grass
Unlocked
Position
Locked
Position
Wing Nut
Wing Nut
Remove
mulching baffle
Insert bagging
adapter here
Chute
Door
Lower Handle of
Grass Bag
Lift bag
here

12
bag. See Figure 14. The bag will open and grass
clippings will fall out. Empty the grass bag at a
proper disposal site.
Side-Discharge Grass Clippings
This mower can also side-discharge grass clippings.
For that, you will have to install the side-discharge
chute on to the unit.
•Remove mulching baffle or grass bag adapter. See
Figure 12.
•Attach discharge chute with wing nuts. See Figure
15. Once the side-discharge chute is in place, you
can run the mower and the grass clippings will be
discharged sideways.
Figure 15
Mulching Grass
•When the mulching baffle is installed on the unit,
the mower is used to mulch grass clippings. If the
mulching baffle is not already installed, you will
have to remove the grass bag or side-discharge
chute as the case may be, and install the mulching
baffle for the purpose. Make sure wing nuts
securing the mulching baffle to the deck (Figure 12)
are firmly tightened before starting to mulch.
Using Your Rotary Mower
•Make sure that lawn is clear of stones, sticks, wire,
or other objects which could damage the lawn
mower or its engine. .
•For best results, do not cut wet grass. 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.
WARNING: If your mower strikes a
foreign object, stop the engine. Remove wire
from spark plug, thoroughly inspect for any
damage, and do necessary repairs before
operating the mower again. Extensive
vibration of the mower during operation is an
indication of damage.
SECTION 6: MAKING ADJUSTMENTS
WARNING: Do not at any time make any
adjustment to lawn mower without first
stopping engine and disconnecting spark
plug wire.
Cutting Height
The rear wheel cutting height adjustment lever is
located above the left rear wheel.
•To adjust, pull the lever out and away from the
mower and move it forward or backward to the
desired cutting height. See Figure 16A.
The front wheel cutting height is determined by the
selection of one of six slots in each caster assembly.
•To adjust, remove the wing nut from the axle bolt.
Slide the axle bolt and spring washer from the
assembly and select a cutting height. With the
spring washer on the axle bolt, reinsert hardware in
the square hole desired through the wheel
assembly and secure with the wing nut previously
removed. See Figure 16B.
IMPORTANT: All wheels must be placed in the same
relative position. For rough or uneven lawns, raise the
cutting height of your lawn mower. Figure 16
Side-Discharge
Chute
Wing
Axle Bolt
Spring
Nut
A
Washer
Rear Height
Adjustment
Lower
Higher
Lever
B

13
Handle Height
Your mower is shipped with the handle in the higher
height position.To lower the handle height for your
convenience, proceed as follows.
Figure 17
•Remove the starter rope from the rope guide.
•Remove the upper handle by removing the hand
knobs and carriage bolts. Lay the upper handle out
of the way, being careful not to bend or kink cables.
•Remove the hairpin clips from the weld pins on the
handle brackets.
•Remove carriage bolts and wing nuts from the two
handle brackets on both sides. Press outward on
the legs of the lower handle, and remove it from the
mower.
•Turnthe lower handle around so the notches on the
bottom of the lower handle are facing forward as
shown in Figure 17.
•Reassemble, placing the bottom holes in the
handle over the weld pins in the handle mounting
bracket.
•Reassemble the upper handle.
•Place the hairpin clips in the inner holes in the weld
pins. Secure carriage bolts and wing nuts on the
handle brackets. Reattach the starter rope.
Drive Clutch Control
The drive clutch control adjustment wheel is located in
the drive clutch control handle housing and is used to
tighten or loosen the drive belt. You will have to adjust
the drive clutch control if any of the following happens:
1. The mower does not propel itself with the drive
clutch engaged.
2. The mower’s drive wheels hesitate with the drive
clutch engaged.
•To resolve the above problems, rotate the
adjustment wheel with your fingers: clockwise to
tighten the cable and counter-clockwise to loosen
the cable. See Figure 18.
Figure 18
NOTE: For some operators, the drive clutch handle
may not be in a comfortable position. If so, you can
adjust the handle by tightening the adjustment wheel.
Shift Lever Cable
Periodic adjustment of the six-speed shift cable may be
required due to normal wear on the cable. Adjustment
is needed if all six speeds do not work.
The adjustable cable bracket is located on the left side
of the mower beside the engine. Follow steps below to
adjust the shift lever.
•Start the engine and place speed control lever in
the sixth speed position.
•Stop the engine; disconnect spark plug wire and
ground it.
•Loosen hex nut (A) which secures the adjustable
cable bracket. This bracket is located on the left
side (towards the center) of the cutting deck. See
Figure 19 for location of the bracket.
Figure 19
•Push back on the adjustable cable bracket. See
Figure 19 inset.
•After adjusting as required, tighten hex nut (A).
Notch
Lower
Handle
Adjustment
Bottom View
Wheel
Hex Nut (A)
Adjustable Cable Bracket
PUSH

14
SECTION 7: MAINTAINING YOUR LAWN MOWER
WARNING: Always stop engine and
disconnect the spark plug wire before
cleaning, lubricating or doing any kind of
maintenance work on the lawn mower.
IMPORTANT: When tipping the unit, empty the fuel tank
and keep the engine with the discharge chute side 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 or air filter
element causing a starting problem.
Engine
Refer to the separate engine manual for all engine
maintenance instructions.
•Maintain engine oil as instructed in the engine
manual. Follow all instructions carefully.
•Service air cleaner every 25 hours under normal
conditions. Clean every few hours under extremely
dusty conditions. Poor engine performance and
floodingusuallyindicatesthattheaircleanershould
be serviced. To service the air cleaner, refer to the
engine manual.
•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;
check engine manual for correct plug type and gap
specifications.
•Clean the engine regularly with a cloth or brush.
Keep the cooling system (blower housing area)
clean to permit proper air circulation which is
essentialtoengineperformanceandlife.Becertain
to remove all grass, dirt and combustible debris
from muffler area.
Cutting Deck
•Clean the underside of the mower deck after each
use to prevent 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.
•To clean, tilt the mower and scrape clean with a
suitable tool.
NOTE: We do not recommend the use of pressure
washers or garden hose to clean your unit. These may
cause damage to electric components, spindles,
pulleys, bearing or the engine. The use of water will
result in shortened life and reduced serviceability.
Cutting Blade
•Periodically inspect the blade adapter for cracks,
especially if you strike a foreign object. Replace
when necessary.
WARNING: When removing the cutting
blade for sharpening or replacement, protect
hands by wearing heavy gloves or using 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 20
•Remove the blade and the blade adapter from the
crankshaft. See Figure 20.
Figure 20
•When sharpening the blade, follow the original
angle of grind as a guide.
NOTE: 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 it could break
causing personal injury.
•Test the blade by balancing it on a round 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. Before reinstalling the blade
and the blade adapter to the unit, lubricate the
engine crankshaft and the inner surface of the
blade adapter with light oil.
•Be sure to install the blade with the side of the
blade marked “Bottom” (or with part number) facing
the ground when the mower is in the operating
position. See Figure 20.
•Slide blade adapter toward the engine crankshaft
•Place blade on adapter. Be certain the blade is
aligned with and seated on the blade adapter
flanges.
Blade
Hex Bolt
Blade Bell
Adapter
Support

15
•Place blade bell support on blade. Make sure the
notches on the blade bell support are aligned with
the small hole in the blade.
•Replace hex bolt and tighten to secure.
Torque: 450 in. lbs. min., 600 in. lbs. max.
NOTE: To ensure safe operations of your unit, the
blade bolt must be checked periodically for correct
torque.
Lubrication
Blade Control
•Lubricate the pivot points on the blade control
handle and the brake cable at least once a season
with light oil. See Figure 21. The blade control must
operate freely in both directions.
Wheels
•Lubricate the wheel at least once a season with
light oil (or engine oil). Also, if the wheels are
removedfor any reason, lubricate thesurfaceof the
axle bolt and the inner surface of the wheel with
light oil. See Figure 21.
CasterAssembly
•Grease fittings are provided for easy lubrication of
the swivel pins located on the front caster
assembly. See Figure 21.
Engine
•Follow engine manual for lubrication instructions.
Figure 21
SECTION 8: SERVICING YOUR MOWER
Replacing Battery Pack
(Electric Start Units Only)
Remove the battery pack from the handle panel for
replacement only. Do not separate the batteries for any
reason. Dispose of batteries properly.
WARNING: Batteries contain sulfuric acid
which may cause burns. Do not short circuit or
mutilate batteries in any way. Do not put
batteries in fire as these may burst or release
toxic materials.
When replacing battery pack in handle panel, battery
pack must be positioned with the positive terminal to
the right hand side and the negative terminal to the left
hand side of panel. Replacing the battery pack
incorrectly will cause serious damage. The positive
lead on the wire harness has the smaller connector.
Connect the positive lead to the positive side of the
battery pack, then connect the negative side.
In-line Fuse(Electric Start Units Only)
The unit is equipped with an in-line fuse. If the unit fails
to start, check the fuse inside the battery cover by
turning the end of the fuse holder and removing from
the battery cover. Replace with standard automotive 7-
1/2 amp fuse.
Refer to Engine Manual
Lubricate
Lubricate
Lubricate
Lubricate

16
Replacing Drive Belt
•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.
•Place shift lever in the first position and tip the
mower on its side.
•Remove the center bolt which secures the blade to
the crankshaft followed by blade bell support,
blade, and blade adapter.
•Move the cutting height adjustment to the highest
position.
•Remove the three hex screws holding the baffle to
the deck and pivot baffle towards the rear of the
mower. See Figure 22.
Figure 22
•Remove the hex bolt from the rear of unit holding
the transmission to the mower housing.
See Figure 23.
Figure 23
•Tilt the transmission forward and loosen the idler
pulley bolt and lock nut half a turn. SeeFigure 24.
•Using a pair of pliers, pull back and rotate belt
keeper bracket from the slot on the idler pulley.
Figure 24
•Slide the belt out from between the belt keeper
bracket and the idler pulley. SeeFigure 24.
•Squeeze the belt together and push it forward,
while pressing the control arm inward towards the
deck. Remove the six-speed cable from the slot.
See Figure 25.
Figure 25
•Pivot the control arm down and away from the
pulley and the belt. See Figure 25.
•Lift off the lower pulley assembly and remove the
old belt from around the crankshaft. See Figure 26.
Baffle
Cutting Height
Adjustment Hex Bolt
NOTE: Mower is flipped on its left wheels for better access.
Transmission
Belt Keeper
Bracket
Idler
Belt
Idler Pulley
Bracket
Transmission
Pulley
Bolt and
Locknut
Pulley
Belt
Six-Speed
Control
Cable Slot
Arm

17
Figure 26
•Place the new belt over the transmission pulley.
Start the belt in the pulley groove and rotate the
pulley until the belt is seated in transmission pulley.
•Place the belt between the idler pulley and the belt
keeper bracket.
•Using a pair of pliers, rotate the belt keeper bracket
so that it snaps into slot on the idler bracket.
•Tighten the idler pulley bolt and lock nut half a turn.
•Place the belt between the two pulley halves on the
crankshaft. Make sure to route the belt inside the
belt guard pin. See Figure 27.
Figure 27
IMPORTANT: When replacing the belt, do not disas-
semble the lower pulley assembly.
•Pinch both sides of the belt together so that the belt
is not in the pulley groove, and the lower pulley can
be pushed towards the engine. See Figure 28.
Figure 28
•Pivot the control arm back to its original position
and reinstall the six-speed cable into the slot. See
Figure 29.
•Check and make sure the belt is routed inside the
pulley halves and the belt guard pin.
Figure 29
•Reinstall the bolt securing transmission to rear
mower housing.
•Pivot the baffle back to its original position and
secure with three hex screws earlier removed.
•Lightly lubricate the inside of the blade adapter and
reinstall the spacer, wave washer, blade adapter
assembly, and blade in the correct order.
•Tighten the hex bolt to secure the blade to torque:
450-600 in. lbs.
•
SECTION 9: OFF-SEASON STORAGE
The following steps should be taken to prepare lawn
mower for storage.
•Cleanand lubricatemower thoroughlyasdescribed
in the lubrication instructions.
•We do not recommend the use of pressure
washers or garden hose to clean your unit. They
may cause damage to electric components,
spindles, pulleys, bearings or the engine. The use
of water will result in shortened life and reduce
serviceability.
•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
an unventilated 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.
Belt
Lower
Crankshaft
Pulley Half
Belt
Lower
Pulley
Half
Upper
Pulley
Half
Belt
Tab
Guard Pin
Belt
Lower Pulley
Belt
Guard Pin
Half
Six-Speed
Cable Slot
Control
Arm

18
SECTION 10: TROUBLE SHOOTING GUIDE
Refer to separate engine manual packed with your mower for more engine related information.
NOTE: For repairs beyond the minor adjustments listed above, contact your nearest authorized service dealer.
Trouble Possible Cause(s) Corrective Action
Engine fails to start 1. Blade control handle
disengaged.
2. Spark plug wire disconnected.
3. Engine not primed.
4. Fuel tank empty, or stale fuel.
5. Blocked fuel line.
6. Faulty spark plug.
7. Engine flooded.
1. Engage blade control handle.
2. Connect wire to spark plug.
3. Depress primer bulb slowly three
times.
4. Fill tank with clean, fresh gasoline.
5. Clean fuel line.
6. Clean, adjust gap or replace.
7. Wait for the engine to dry out.
Engine runs erratic 1. Spark plug wire loose.
2. Blocked fuel line or stale fuel.
3. Vent in gas cap plugged.
4. Water or dirt in fuel system.
5. Dirty air cleaner.
6. Carburetor out of adjustment.
1. Tighten spark plug wire.
2. Clean fuel line; fill tank with fresh
gasoline.
3. Clear vent.
4. Drain fuel tank. Refill with fresh fuel.
5. Clean air cleaner.
6. Adjust carburetor. Follow engine
manual.
Engine overheats 1. Engine oil level low.
2. Air flow restricted.
3. Carburetor not adjusted
properly.
1. Fill crankcase with proper oil.
2. Remove blower housing and clean.
3. Adjust carburetor.
Occasionalskip(hesitates)
at high speed 1. Spark plug gap too close. 1. Adjust gap to .030”.
Idles poorly 1. Spark plug fouled, faulty or
gap too wide.
2. Carburetor out of adjustment.
3. Dirty air cleaner.
1. Reset gap to .030” or replace spark
plug.
2. Adjust carburetor. Follow engine
manual.
3. Clean air cleaner.
Excessive vibration 1. Cutting blade loose or
unbalanced.
2. Bent cutting blade.
1. Tightenblade andadapter.Balance
blade.
2. Replace blade.
Mower will not mulch grass 1. Wet grass.
2. Excessively high grass.
3. Dull blade.
1. Wait until later to cut.
2. Mow once at a high cutting height,
then mow again at desired height or
make a narrower cutting swath (1/2
width).
3. Sharpen or replace blade.
Uneven cut 1. Wheels not positioned
correctly.
2. Dull blade.
1. Placeallfourwheelsinsameheight
position.
2. Sharpen or replace blade.

19
Decorative & Safety Labels

20
SECTION 11: PARTS LIST FOR MODELS 999 & E999
Transmission Assembly
for Reference only
Pulley
for Reference only
Assembly
44
45
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 Yard-Man
Green, the part number to order would be
700-xxxx-0665.
Yard-Man Green: 0665
Yard-Man Yellow: 0674
Powder Black: 0637