21” Self-Propelled
Mower
Model Series
959
PRINTED IN U.S.A.
FORM NO.
769-00018.fm
(2/2002)
IMPORTANT: READ SAFETY RULES AND INSTRUCTIONS CAREFULLY
Operator’s Manual
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.
Troy-Bilt LLC, P.O. BOX 361131 CLEVELAND, OHIO 44136-0019
2
TABLE OF CONTENTS
Content Page
Important Safe Operation Practices...................................................................................3
Slope Gauge......................................................................................................................6
Assembling Your Lawn Mower ..........................................................................................7
Know Your Lawn Mower....................................................................................................8
Operating Your Lawn Mower .............................................................................................9
Making Adjustments ..........................................................................................................10
Maintaining Your Lawn Mower...........................................................................................11
Servicing Your Lawn Mower ..............................................................................................12
Off-Season Storage...........................................................................................................14
Troubleshooting.................................................................................................................15
Parts List ..........................................................................................................................16
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. This information is very
important if you need help from our Customer Support Department or an authorized dealer.
• You can locate the model number by looking down at the rear of the 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.
ENGINE INFORMATION
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.
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.
Call 1-866-840-6483 or 1-330-558-7220 to reach the Customer Dealer Referral Line. Please
have your unit’s model number and serial number ready when you call. See previous section
to locate this information.
Copy the model number here:
Copy the serial number here:
(Model Number)
(Serial Number)
For more details about your unit, visit our website at www.troybilt.com
3
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: The Engine Exhaust from this product contains chemicals known to the State of California
to cause cancer, 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,
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 a wall or obstruction which may cause
discharged material to ricochet back toward the operator.
5. To help avoid blade contact or a thrown 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 well balanced with sure footing.
c. Pull the mower back slowly, 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 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
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.
4
20. Never operate mower without proper trail shield,
discharge cover, grass catcher, blade control handle or
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. Muffler and engine become hot and can cause a burn. Do
not touch.
22. Only use parts and accessories made for this machine by
the manufacturer. 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 1-866-840-6483 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. 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. If you feel you are losing your
balance, release the blade control handle immediately,
and the blade will stop rotating within 3 seconds.
Do Not:
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. 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. 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
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
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.
General Service:
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.
5
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
with the original equipment manufacture’s (O.E.M.) blade
only, listed in this manual. “Use of parts which do not
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. After striking a foreign object, stop the 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.
6
SECTION 2: SLOPE GAUGE
15°
SIGHT AND HOLD THIS LEVEL WITH A VERTICAL TREE
A POWER POLE
A CORNER OF A BUILDING
OR A FENCE POST
F
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USE THIS PAGE AS A GUIDE TO DETERMINE SLOPES WHERE YOU MAY NOT OPERATE SAFELY.
Do not mow on inclines with a slope in excess of 15 degrees (a rise of approximately 2-1/2 feet every 10 feet). 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 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.
WARNING
7
SECTION 3: ASSEMBLING YOUR LAWN MOWER
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.
Removing Unit From Carton
• 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, hardware pack etc.).
• Cut corners and lay carton down flat. Remove
packing material.
• Roll or slide unit out of carton thoroughly for loose
parts.
Disconnecting Spark Plug
Before setting up your lawn mower, disconnect the
spark plug wire from the spark plug and ground against
the engine. See Figure 1.
Figure 1
Setting Up Your Lawn Mower
• Lift up and pull back on the upper handle to raise
the handle into the operating position. Make certain
the lower handle is seated securely into the handle
mounting brackets. tighten the wing nuts on each
side of the handle (carriage bolts must be seated
properly into the handle). See Figure 2.
NOTE: Your mower is shipped with the handle in the
higher height position. If you wish to lower the height of
the handle, refer to the Adjustment Section at this time.
Figure 2
• Remove the hairpin clips from the outer hole in the
weld pins on the handle mounting brackets. Using a
pair of pliers, squeeze one leg of the mower handle
against the handle mounting bracket. Insert the
hairpin clip into the inner hole on the weld pin.
Repeat on other side. See Figure 3.
• After moving the hairpin clip, insert the carriage bolt
from hardware pack in the upper hole on the handle
mounting bracket and secure with plastic wing nut
from the hardware pack. Repeat on other side.
Figure 3
• Fasten the cables to the lower handle with the two
cable ties found on the lower handle. Be sure to
insert the post on the cable ties into the holes
provided on the lower handle. These holes may be
found on either the inside or the outside of the
handles. Pull the cable ties tight and trim off the
excess. See Figure 4.
Figure 4
Spark
Plug
Spark Plug
Wire
Handle Assembly
Handle Mounting
Bracket
Wing Nut
Handle Mounting
Bracket
Lower
Handle
Hairpin
Clip
Inner Hole
Carriage Bolt
Wing Nut
Cable Tie
Lower
Handle
8
Attaching Starter Rope
• The rope guide is attached to the right side of upper
handle. Loosen the wing nut which secures the
rope guide. See Figure 5.
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 wing nut.
SECTION 4: KNOW YOUR LAWN MOWER
Read this operator’s manual and safety rules before
operating your lawn mower. Compare the illustration in
Figure 6 with your lawn mower to familiarize yourself
with the location of various controls and adjustments.
Save this manual for future reference.
Blade Control Handle
The blade control handle is located on the upper handle
of the mower. See figure 6. The blade control handle
must be depressed in order operate the unit. Release
the blade control handle to stop the engine and blade.
Recoil Starter
The recoil starter handle is attached to the upper
handle. See figure 6. Stand behind the unit in the
operating position to start the unit. See Figure 6.
Drive Clutch Control
The drive clutch control housing is located on the upper
handle. Squeeze the drive control to engage the drive
system. Release the clutch control to disengage the
drive system. Release the clutch control to slow down
when approaching an obstacle, making a turn, or
stopping. See Figure 6.
Shift Lever
The shift lever is located on the drive clutch control
housing on the upper handle. See figure 6. This lever is
used to select the forward speed of the mower. When
changing your speed selection, release the drive clutch
control. See Figure 6.
NOTE: Only move the shift lever when the engine is
running. Changing the shift lever setting with the engine
off can cause damage to the mower.
Cutting Height Adjustment Lever
The cutting height adjustment lever is located above
the left rear wheel. To adjust the cutting height, pull the
lever out and away from the mower, then move it
forward or back to the desired cutting height. See
Figure 6.
Engine Controls
See the engine manual for the location and function of
the controls located on the engine.
Stopping Engine
• Release blade control handle to stop the engine
and the blade.
• Disconnect spark plug wire and ground it to a bolt
on the engine.
Figure 6
Wing Nut
Starter
Upper Handle
Rope
Rope
Guide
Lower
Handle
WARNING: The operation of any lawn
mower can result in foreign object 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.
WARNING: This blade control mechanism is
a safety device. Never attempt to bypass its
operations.
Recoil
Starter
Drive
Clutch
Control
Cutting Height
Adjustment Lever
Blade Control Handle
Shift Lever
9
SECTION 5: OPERATING YOUR LAWN MOWER
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 determined
which height is best for your lawn. See adjustment
section for details.
Gas and Oil Fill-Up
Service the engine with gasoline and oil as instructed in
the separate engine manual packed with your mower.
Read instructions carefully.
Before Starting Your Mower
• Attach spark plug wire to spark plug. Make certain
the metal cap on the end of the spark plug wire is
fastened securely over the metal tip on the spark
plug.
• Check for proper drive clutch operation using the
NEUTRAL ADJUSTMENT TEST.
Neutral Adjustment Test
To perform the NEUTRAL ADJUSTMENT TEST
answer the following questions.
• With the drive clutch control released, push mower
forward and pull it backward. Does it move freely?
• Squeeze the drive clutch control and pull the
mower backward. Do the rear wheels lock (not
turn)?
• 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 go through the DRIVE CLUTCH CONTROL
ADJUSTMENT found in the ADJUSTMENTS section.
Starting Engine
• Prime engine as instructed in the separate engine
manual.
• Your lawn mower is equipped with a constant
speed throttle, which is set at full throttle for best
performance.
• Stand behind the unit, squeeze and hold the blade
control handle against the upper handle.
• Grasp starter handle and pull rope out slowly until
engine reaches start of compression cycle (rope
will pull slightly harder at this point). Let the rope
rewind slowly. Pull rope with a rapid, continuos, full
arm stroke. Keep a firm grip on starter handle.
Return it slowly to the rope guide.
NOTE: If any problems are encountered, refer to the
TROUBLE SHOOTING Section of this manual.
Stopping Engine
• Release the blade control handle to stop the engine
and blade.
• Disconnect the spark plug wire and ground it
against a bolt on the engine.
Using Your Lawn Mower
Be sure that lawn is clear of stones, sticks, wire, or
other objects which could damage the lawn mower or
engine. Such objects could be accidently thrown by the
mower in any direction and cause serious personal
injury to the operators and others.
For the best results, do not cut wet grass because it
tends 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.
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.
WARNING: Never fill fuel tank indoor with
engine running or until the engine has been
allowed to cool for at least two minutes after
running.
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
indiction of damage. The unit should be
promptly inspected and repaired.
10
Attaching Side Discharge Chute
This mower can side discharge grass clippings. Follow
instructions below to ready this mower for side
discharge operation.
• Remove mulching baffle from unit by disconnecting
wing nuts.
• Attach side discharge chute to unit and secure with
the three wing nuts. See Figure 7.
Figure 7
SECTION 6: MAKING ADJUSTMENTS
Handle Height Adjustment
Your mower is shipped with the handle in the higher
height position. To lower the handle height, proceed as
follows.
• 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 the
cables.
• Remove the hairpin clips from the weld pins on the
handle brackets. Press out the legs of the lower
handle. Remove the lower handle from the mower.
• Turn the lower handle around so the notch on the
bottom of the lower handle is facing forward as
shown in Figure 8.
• Reassemble, placing the bottom holes in the
handle over the weld pins in the handle mounting
bracket.
• Place the hairpin clips in the inner holes in the weld
pins and insert the carriage bolts in the upper hole
on the handle mounting bracket and secure with
plastic wing nuts.
• Reassemble the upper handle to the lower handle.
• Attach the starter rope as instructed in the
assembly section.
Figure 8
Drive Clutch Control Adjustment
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:
• The mower does not propel itself with the drive
clutch engaged.
• 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
9.
Figure 9
Side Discharge
Chute
Wing
Nuts
WARNING: Do not at any time make any
adjustment to lawn mower without first
stopping engine and disconnect spark plug
wire.
Notch
Lower Handle
Adjustment
Bottom View
Wheel
Drive Clutch
Control
Upper
Handle
11
NOTE: For some people the drive clutch handle may
not be in a comfortable position. You can adjust the
handle out by tightening the adjustment wheel.
Shift Lever Cable Adjustment
Periodic adjustment of the three speed shift cable may
be required due to normal wear on the cable.
Adjustment is needed if all three speeds do not work.
The adjustable cable bracket is located on the left side
of the mower, beside the engine. Follow instructions
below to adjust shift lever.
• Start Engine and place speed control in the third
speed position. See Figure 10.
Figure 10
• Stop engine and disconnect spark plug wire and
ground it against engine.
• Loosen hex nut (A) which secures the adjustable
cable bracket. See Figure 11.
• Push back on the adjustable cable bracket and
tighten hex nut (A). See Figure 11.
Figure 11
SECTION 7: MAINTAINING YOUR LAWN MOWER
NOTE: When tipping the unit or emptying 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.
Cleaning Mower
• Clean the underside of the mower deck after each
use to prevent any build-up of grass clippings. If this
debris is allowed to accumulate, it will result in rust
or corrosion.
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.
• Disconnect spark plug wire.
• Drain the gasoline from the lawn mower, or place a
piece of plastic under the gas cap.
• Tilt the mower so that the side with the air cleaner is
facing up. Hold the mower firmly.
• Scrape and clean the underside of the deck with a
suitable tool. Do not spray with water.
• Put the mower back on its wheels. If you had put
plastic under the gas cap, remove it now.
Engine Maintenance
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. Read and
follow instruction carefully.
• Service air cleaner every 25 hours under normal
conditions. Clean every few hours under extremely
dusty conditions. Poor engine performance and
flooding usually indicated the that he 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;
check engine manual for correct plug type and gap
specifications.
Bottom View
Speed Control
Lever
Upper
Handle
Hex Nut
Adjustable Cable
PUSH
Bracket
(A)
WARNING: Always stop engine and
disconnect spark plug wire before cleaning,
lubricating or doing any kind of service work on
the lawn mower.
12
• 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.
Lubrication
Blade Control
Lubricate the pivot points on the blade control handle
and the brake cable at least once a season with light oil.
The blade control must operate freely in both directions.
See Figure 12.
Wheels
Lubricate the wheels and bearing, if so equipped, at
least once a season with light oil or engine oil. Also, if
the wheel are removed for any reason, lubricate the
surface of the wheel with light oil. See Figure 12.
Figure 12
SECTION 8: SERVICING YOUR LAWN MOWER
Blade Care
• Disconnect spark plug wire from spark plug.
• Turn mower on its side making sure air filter and the
carburetor are up.
• Remove the bolt and blade bell support which hold
the blade and adapter to the engine crankshaft.
See Figure 13.
Figure 13
• Remove blade and adapter from crankshaft.
When sharpening the blade, follow 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 it
could break causing personal injury.
The blade can be tested 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 for 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
ground when the mower is in the operating position.
• Slide blade adapter onto engine crankshaft.
• Place blade on adapter. Be certain the blade is
aligned with and seated onto the blade adapter
flanges.
• Place blade bell support on blade. Make sure the
notches on the blade bell support are aligned with
the small holes in the blade.
• Replace hex bolt.
• Tighten hex bolt to torque: 450 in. lbs. min., 600 in.
lbs. max.
NOTE: To ensure safe operation of your unit, the
blade bolt must be checked periodically for correct
torque.
Lubricate
WARNING: Always stop engine and
disconnect spark plug wire before performing
any repairs or maintenance.
WARNING: Periodically inspect the blade
adapter and pulley 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 using heavy gloves or a thick rag to
grasp the cutting blade.
Blade
Hex Bolt
Blade Bell
Adapter
Support
13
Drive Belt Removal and Replacement
• 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 with air filter facing up.
• Remove the center bolt which secures the blade to
the crankshaft. Remove the blade, and the blade
adapter, wave washer, and spacer. Refer to Blade
Care section on the previous page.
• Move rear height adjuster to the sixth position.
• Remove three hex screws holding the baffle to the
deck and pivot baffle towards rear of the mower.
See Figure 14.
Figure 14
• Remove the hex bolt from the rear of unit holding
the transmission to the mower housing. See Figure
15.
Figure 15
• Tilt the transmission forward and loosen the idler
pulley bolt and lock nut half a turn using two 7/16”
wrenches.
• Using a pair of pliers, pull back and rotate belt
keeper bracket from the slot on idler pulley.
• Slide the belt out from between the belt keeper
bracket and the idler pulley. See Figure 16.
Figure 16
• Squeeze the belt together and push belt forward.
Press the control arm inward towards the deck and
remove the three speed cable from the slot. See
Figure 17.
• Pivot the control arm down away from the pulley
and belt.
• Lift off the lower pulley assembly and remove the
old belt from around the crankshaft. See Figure 17.
Figure 17
Baffle
Cutting Height
Adjustment
Hex Bolt
Transmission
Belt Keeper
Bracket
Idler Pulley
Belt
Idler Pulley
Bracket
Transmission
Pulley
Bolt and
Locknut
Belt
Three-Speed
Control
Cable Slot
Arm
Belt
Lower
Crankshaft
Pulley Half
14
• Place the new belt over the transmission pulley.
Start the belt in pulley groove and rotate pulley until
belt is seated in transmission pulley.
• Place belt between idler pulley and the belt keeper
bracket.
• Using pliers, rotate the belt keeper bracket so that it
snaps into slot on the idler bracket.
• Tighten the idler pulley bolt and locknut 1/2 turn
using two 7/16” wrenches.
• Place belt between the two pulley halves on the
crankshaft. Make sure to route the belt inside the
belt guard pin. See Figure 18.
Figure 18
IMPORTANT:
When replacing the belt, do not
disassemble the lower pulley assembly.
• Pinch belt together so that it is not in the pulley
groove, and the lower pulley can be pushed
towards the engine. See Figure 19.
Figure 19
• Pivot the control arm back to its original position
and reinstall the three-speed cable into the slot.
See Figure 20.
• Check and make sure the belt is routed inside the
pulley halves and the belt guard pin.
Figure 20
• 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. You
will need a 3/8” socket for those screws.
• Lightly lubricate the inside of the blade adapter and
reinstall spacer, wave washer, blade adapter
assembly and the blade in the correct order.
• Tighten the hex bolt to secure the blade. Follow
recommended torque which is 450-600 in. lbs.
SECTION 9: OFF SEASON STORAGE
The following steps should be taken to prepare your
lawn mower for storage.
• Clean and lubricate the mower thoroughly as
described in the lubrication instructions.
NOTE: 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
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.
Belt
Belt
Tab
Guard Pin
Upper Pulley
Half
Lower Pulley
Half
Belt
Lower Pulley
Belt
Guard Pin
Half
Three-Speed
Cable Slot
Control
Arm
15
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.
Problem Cause Remedy
Engine fails to start 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. 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.
Engine runs erratic 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. 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.
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.
Idles poorly 1. Spark plug fouled, faulty or gap too
wide.
2. Carburetor improperly adjusted.
3. Dirty air cleaner.
1. Reset gap to.030” or replace spark
plug.
2. Adjust carburetor.
3. Clean air cleaner.
Excessive vibration 1. Cutting blade loose or unbalanced.
2. Bent cutting blade.
1. Tighten blade and adapter. Balance
blade.
2. Replace blade.
Mower will not mulch grass 1. Wet grass.
2. Excessively high grass.
3. Dull 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.
Uneven cut 1. Wheels not positioned correctly.
2. Dull blade.
1. Place all four wheels in same height
position.
2. Sharpen or replace blade.
16
SECTION 11: ILLUSTRATED PARTS LIST 959
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
27
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
45
51
50
52
53
54
56
55
57
57
58
59
60
61
62
63
64
65
66
67
33
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
68
28
88
30
90
91
89
92
17
Model 959
Ref.
No.
Part No. Part Description
1. 647-0004 Control Handle
2. 731-0904A Upper Control Handle
3. 16864 3 Spd. Rack Cable Bracket
4. 731-0620 Control Lever
5. 713-0397 Gear Insert
6. 732-0627 Shift Lever Spring
7. 731-0924 3 Speed Shift Lever
8. 731-0905A Lower Control Housing
9. 710-1667A C Sunk Tap Screw #10 x .75 Lg
10. 731-0906 Cable Mounting Cap
11. 746-0711A Drive Cable 51.0
12. 712-0324 Top Lock Nut 1/4-20
13. 746-0883 Control Housing
14. 710-1270 Oval C-Sunk Screw
15. 746-1131 Control Cable 46”
16. 749-0439D Upper Handle
17. 720-0241 Wing Nut
18. 736-0451 Saddle Washer .320 ID x .830 OD
19. 710-1174 Carriage Bolt 5/16-18 x 2.0
20. 726-0240 Cable Tie
21. 749-0907B Lower Handle
27. 731-1901 Trail Shield
28. 732-0842 Trail Shield Wire
30. 731-1832 Side Discharge Chute
31. 731-1833 Mulch Cover
32. 782-0078B Deck 21”
33. 712-0397 Wing Nut
34. 710-0703 Carriage Bolt 1/4-20 x .75
35. 746-0939 3 Speed Cable
36. 782-7574A Cable Adjustment Bracket
37. 736-0270 Bell Washer .265 ID x .75 OD
38. 712-3006 Hex Nut 1/4-20
39. 710-0167 Carriage Screw 1/4-20 x .50
40. 712-0138 Hex Nut 1/4-28
41. 782-7575A Cable Mounting Bracket
42. 736-0329 Lock Washer 1/4
43. 756-0625 Roller Cable
44. 738-0924 Shoulder Screw .375 ID x 1/4-14
45. 714-0104 Cotter Pin
46. 736-0286 Bowed Washer
47. 782-0565 Single Lever Control Arm
48. 734-2044 Wheel 9 x 2
49. 712-0414 Top Lock Tab Weld Nut 1/4-20
50. 16855 Ratchet Pawl Plate
51. 10622B Plastic Spring Ratchet
52. 748-0381 Pawl RH
748-0188B Pawl LH
53. 738-0137A Shld Screw .340 ID x .285 OD
54. 748-0318 Wheel Rachet
55. 736-0270 Bell Washer .265 ID x .75 OD
56. 710-0751 Hex Cap Screw 1/4-20 x .620
57. 731-0981A Hubcap
58. 738-0102 Shoulder Screw .498 x 1.445
59. 736-0504 Wave Washer .510 ID x .750 OD
60. 734-2004A Wheel 8 x 2
61. 736-0105 Spring Washer .401 ID x .870 OD
62. 710-1348 Screw 1/4-14 x .500
63. 710-0896 Screw 1/4-14 x .625
64. 710-0654A Hex Washer Screw 3/8-16 x 1.0
65. 611-0064 Front Axle Assembly
66. 736-0204 Flat Washer .344 ID x .62 OD
67. 710-0703 Carriage Screw 1/4-20 x .75
68. 710-1242 Torx Screw
69. 741-0492A Block Bushing
70. 710-1241 Hex Washer Screw
71. 731-1836 Front Axle Cover
72. 754-0460 Belt 3/8 x 39.24
73. 656-0613 Pulley Assembly
74. 750-1071 Sleeve Spacer .88 ID x 1.13 OD
75. 750-1070 Sleeve Spacer .88 ID x 1.00 OD
76. 782-7597 Pivot Bracket
77. 710-0654A Screw 3/8-18 x 1.0
78. 782-7596 Control Arm
79. 732-0807 Torsion Spring
80. 711-1114 Pivot Shaft
81. 736-0526 Wave Washer 1.38 ID x .88 OD
82. 731-1828 Baffle
83. 710-0653 Screw 1/4-20 x 3.75
84. 753-0609 Blade Adapter Kit
85. 742-0741 21” Mulching Blade
86. 736-0524A Blade Bell Support
87. 710-1257 Hex Bolt 3/8-24 x 2.5
88. 720-0294 Grip
89. 682-3053 Handle Brkt. Ass’y L.H.
- 682-3052 Handle Brkt. Ass’y R.H.
90. 710-1205 Eyebolt 1/4-20
91. 720-0279 Knob
92. 710-0969 Hi-Low Scr. #12
- CC-190-092 Optional Grass Bag
- 737-0476 Bottle of Oil
Ref.
No.
Part No. Part Description
18
Model 959
1
2
3
4
5
6
7
7
8
9
10
11
12
13
14
14
7
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
IMPORTANT: For a proper working
machine, use Factory Approved Parts.
V-BELTS are specially designed to
engage and disengage safely. A substitute
(non OEM) V-belt can be dangerous by
not disengaging completely.
19
Model 959
Ref.
No.
Part No. Part Description
1. 720-0223 Grip
2. 732-0803A Spring Lever
3. 738-0529 Shoulder Nut .825 x .165 Lg.
4. 710-0751 Cap Screw 1/4-20 x .620
5. 736-0270 Bell Washer .285 ID x .75 OD
6. 748-0318 Wheel Rachet
7. 736-0369 Flat Washer .508 ID x 1.0 OD
8. 682-0531 Pivot Arm Assembly
9. 750-0515 Spacer .510 ID x .70 OD
10. 741-0978 Sleeve Bearing .504 ID x .830 OD
11. 750-1056 Shoulder
12. 710-0653 Tap Screw 1/4-20 x .375
13. 682-7528 Chain Cover Assembly
14. 741-0324 Flange Bearing .506 ID x .590 Lg
15. 682-7526 Transmission Axle Assembly
16. 618-0263A Transmission Assembly
17. 710-0604A Hex Screw 5/16-18
18. 713-0453 Chain
19. 638-0012 Rear Axle Assembly
20. 741-0522 Flange Bearing .506 ID x .715 Lg
21. 732-0832 Torsion Spring
22. 750-0151 Spacer .550 ID x .750 OD
23. 710-1315 Screw 3/8-16 x .25
24. 711-0835 Clevis Pin .50 Dia x 4.82 Lg.
25. 750-0807 Spacer .385 ID x .624 OD
26. 782-0568 Hgt Adjustment Spring Bracket
27. 710-1652 Screw 1/4-14 x .825
28. 714-0474 Cotter Pin
29. 712-3025 Hex Jam Nut 5/16-24
30. 736-0425 Bell Washer .325 ID x .930 OD
31. 756-0656 Pulley
32. 736-3084 Flat Washer .510 ID x 1.120 OD
33. 712-0896 Hex Jam Nut 1/4-28
34. 782-7598 Belt Keeper
35. 741-0600 Bearing
36. 732-0849A Extension Spring
37. 750-1050 Flange Spacer
38. 682-0027A Idler Bracket Assembly
39. 710-0299 Hex Cap Screw 1/4-28 x 1.0
40. 741-0682A Bearing Sleeve
41. 736-0570 Flat Washer .885 ID x 1.45 OD
42. 721-0329 Oil Seal
43. 721-0325 Plug
44. 618-0253 Upper Housing Assembly
45. 782-7601A Cable Bracket
46. 741-0690 Bearing
47. 736-0616 Thrust Washer .504 ID x .70 OD
48. 782-7595 Pivot Bracket
49. 741-0324 Flange Bearing
50. 711-1168 Output Shaft 6T
51. 717-1469 Gear 34T
52. 741-0674 Bearing
53. 717-1487 Pinion Shaft 10T
54. 736-0314 Thrust Washer 3/8 x .70
55. 736-0569 Thrust Washer .388 x .625
56. 618-0252 Lower Housing Assembly
57. 710-0642 Hex Screw 1/2-20 x .75
58. 611-0066 Shaft Assembly
59. 664-0121 Grassbag
60. 747-0940A Support Rod w/ Rope Guide
61. 747-0939 Pivot Rod
62. 747-0937 Grassbag Frame
63. 631-0071 Grassbag Cover
Ref.
No.
Part No. Part Description
MANUFACTURER’S LIMITED WARRANTY FOR:
The limited warranty set forth below is given by Troy-Bilt LLC
with respect to new merchandise purchased and used in the
United States, its possessions and territories.
Troy-Bilt LLC warrants this product against defects for a
period of two (2) years commencing on the date of original
purchase and will, 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 accessory or attachment not approved by Troy-Bilt
LLC for use with the product(s) covered by this manual will
void your warranty as to any resulting damage.
Normal wear parts or components thereof are subject to
separate terms as follows: All normal wear parts or
component failures will be covered on the product for a period
of 90 days regardless of cause. After 90 days, but within the
two year period, normal wear part failures will be covered
ONLY IF caused by defects in materials or workmanship of
OTHER component parts. Normal wear parts and
components include, but are not limited to: 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 Troy-Bilt LLC at P.O. Box 361131,
Cleveland, Ohio 44136-0019, or call 1-866-840-6483 or 1-
330-558-7220, or log on to our Web site at www.troybilt.com.
This limited warranty does not provide coverage in the
following cases:
a. The engine or component parts thereof. These items
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 sepa
rate 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. Troy-Bilt LLC does not extend any warranty for
products sold or exported outside of the United States,
its possessions and territories, except those sold
through Troy-Bilt LLC’s authorized channels of export
distribution.
e. Parts that are not genuine Troy-Bilt parts are not
covered by this warranty.
f. Service completed by someone other than an
authorized service dealer is not covered by this
warranty.
g. Transportation charges and service calls are not
covered.
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 Troy-Bilt LLC. 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. Troy-Bilt
LLC 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 a warranted
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 loss, 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.
Troy-Bilt LLC, P.O. BOX 361131 CLEVELAND, OHIO 44136-0019; Phone: 1-866-840-6483, 1-330-558-7220
