Columbia 978 Operator's Manual
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Safety • Set-Up • Operation • Adjustments • Maintenance • Troubleshooting • Parts Lists • Warranty
OPERATOR’S MANUAL
IMPORTANT:
READ SAFETY RULES AND INSTRUCTIONS
CAREFULLY BEFORE OPERATING EQUIPMENT.
PRINTED IN U.S.A.
LES DISTRIBUTIONS RVI LIMITÉE, 2955, JEAN-BAPTISTE DESCHAMPS, LACHINE, QUEBEC H8T 1C5
21” Self-Propelled Rotary Mower — Model Series 900
12/22/10
769-04157C
Model 978 shown.
Finding and Recording Model Number
Table of Contents
This Operator’s Manual is an important part of your new equipment. It will help you assemble,
prepare and maintain the unit for best performance. Please read and understand what it says.
Customer Support
1. If you have difficulty assembling this product or have any questions regarding the controls, operation or maintenance of this
unit, please call an authorized dealer.
Please have your unit’s model number and serial number ready when you call. See previous section to locate this
information.
2. The engine manufacturer is responsible for all engine-related issues in terms of performance, power-rating, specifications,
warranty, and service. Depending on the engine manufacturer, more information is included in this publication or packed
separately with this product.
Slope Gauge........................................................ 3
Safe Operation Practices.................................... 4
Safety Symbols.................................................... 7
Set-Up & Adjustments......................................... 8
Operation............................................................ 10
Maintenance & Off-Season Storage................. 12
Trouble Shooting............................................... 16
Replacement Parts............................................ 17
Warranty............................................................. 18
BEFORE YOU START ASSEMBLING
YOUR NEW EQUIPMENT,
please locate the model plate on the equipment and record
the information in the provided area to the right. You can
locate the model plate by standing at the operating position
and looking down at the rear of the machine. This information
will be necessary, should you seek technical support.
Model Number
Serial Number
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.
Sight and hold this level with a vertical tree...
or a corner of a building...
or a fence post
Fold along dotted line (represents a 15° slope)
15°
Use this page as a guide to determine slopes where you may not operate safely. Do not operate
your lawn mower on such slopes.
1. Read this operator’s manual carefully in its entirety
before attempting to assemble this machine. Read,
understand, and follow all instructions on the ma-
chine and in the manual(s) before operation. Keep
this manual in a safe place for future and regular
reference and for ordering replacement parts.
2. Be completely familiar with the controls and the
proper use of this machine before operating it.
3. This machine is a precision piece of power equip-
ment, 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.
4. Never allow children under 14 years old to operate
this machine. Children 14 years old and over should
read and understand the instructions in this manual
and should be trained and supervised by a adult.
5. Only responsible individuals who are familiar with
these rules of safe operation should be allowed to
use this machine.
6. 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.
7. 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.
8. 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.
9. 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.
10. 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.
11. Do not put hands or feet near rotating parts or under
the cutting deck. Contact with the blade can amputate
hands and feet.
12. A missing or damaged discharge cover can cause
blade contact or thrown object injuries.
13. 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.
14. 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.
15. Do not operate the mower while under the influence of
alcohol or drugs.
16. Do not engage the self-propelled mechanism on units
so equipped while starting engine.
17. 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.
18. 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.
19. Mow only in daylight or in good artificial light. Walk,
never run.
20. Stop the blade when crossing gravel drives, walks or
roads.
21. If the equipment should start to vibrate abnormally,
stop the engine and check immediately for the cause.
Vibration is generally a warning of trouble.
WARNING: Engine Exhaust, some of its constituents, and certain vehicle components contain
or emit chemicals known to the State of California to cause cancer and birth defects or other
reproductive harm.
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 at-
tempting to operate
this machine. Failure
to comply with these
instructions may result
in personal injury. When
you see this symbol.
HEED ITS WARNING!
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.
DANGER: This machine was built to be operated according to the rules for safe operation in this manual. As with
any type of power equipment, carelessness or error on the part of the operator can result in serious injury. This
machine is capable of amputating hands and feet and throwing objects. Failure to observe the following safety
instructions could result in serious injury or death.
22. 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.
23. 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.
24. Muffler and engine become hot and can cause a burn.
Do not touch.
25. Never attempt to make a wheel or cutting height
adjustment while the engine is running.
26. Only use parts and accessories made for this machine
by the manufacturer. Failure to do so can result in
personal injury.
27. When starting engine, pull cord slowly until resistance
is felt, then pull rapidly. Rapid retraction of starter cord
(kickback) will pull hand and arm toward engine faster
than you can let go. Broken bones, fractures, bruises
or sprains could result.
28. If situations occur which are not covered in this
manual, use care and good judgment. Call customer
assistance for the name of your nearest servicing
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.
Wash your skin and change clothes immediately.
2. Use only an approved gasoline container.
3. Never fill containers inside a vehicle or on a truck or
trailer bed with a plastic liner. Always place contain-
ers on the ground away from your vehicle before
filling.
4. 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.
5. 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.
6 Extinguish all cigarettes, cigars, pipes and other
sources of ignition.
7. Never fuel machine indoors because flammable
vapors will accumulate in the area.
8. Never remove gas cap or add fuel while the engine
is hot or running. Allow engine to cool at least two
minutes before refueling.
2
Safe
Operation
Practices
WARNING
This machine is equipped
with an internal combus-
tion engine and should
not be used on or near
any unimproved forest-
covered, brushcovered or
grass-covered land unless
the engine’s exhaust
system is equipped with a
spark arrester meeting ap-
plicable local or provincial
laws (if any).
If a spark arrester is used,
it should be maintained in
effective working order by
the operator.
A spark arrester for the muf-
fler is available through your
nearest engine authorized
service dealer.
Notice regarding Emis-
sions
Engines which are certified
to comply with California
and federal EPA emission
regulations for SORE (Small
Off Road Equipment) are
certified to operate on regu-
lar unleaded gasoline, and
may include the following
emission control systems:
Engine Modification (EM)
and Three Way Catalyst
(TWC) if so equipped.
9. Never over fill fuel tank. Fill tank to no more than ½
inch below bottom of filler neck to provide for fuel
expansion.
10. Replace gasoline cap and tighten securely.
11. If gasoline is spilled, wipe it off the engine and equip-
ment. Move unit to another area. Wait 5 minutes
before starting the engine.
12. Never store the machine or fuel container near an
open flame, spark or pilot light as on a water heater,
space heater, furnace, clothes dryer or other gas
appliances.
13. 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.
14. 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.
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 manufac-
ture’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 manufac-
turer’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. Check fuel line, tank, cap, and fittings frequently for
cracks or leaks. Replace if necessary.
12. Do not crank engine with spark plug removed.
13. Maintain or replace safety labels, as necessary.
14. Observe proper disposal laws and regulations.
Improper disposal of fluids and materials can harm the
environment.
15. According to the Consumer Products Safety Commis-
sion (CPSC) and the U.S. Environmental Protection
Agency (EPA), this product has an Average Useful Life
of seven (7) years, or 60 hours of operation. At the
end of the Average Useful Life, buy a new machine or
have the machine inspected annually by an authorized
service dealer to ensure that all mechanical and safety
systems are working properly and not worn exces-
sively. Failure to do so can result in accidents, injuries
or death.
Do not modify engine
To avoid serious injury or death, do not modify engine in
any way. Tampering with the governor setting can lead
to a runaway engine and cause it to operate at unsafe
speeds. Never tamper with factory setting of engine
governor.
2
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!
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.
WARNING: 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.
SAVE THESE INSTRUCTIONS!
This page depicts and describes safety symbols that may appear on this product. Read, understand, and follow all
instructions on the machine before attempting to assemble and operate.
Symbol
Description
READ THE OPERATOR’S MANUAL(S)
Read, understand, and follow all instructions in the manual(s) before
attempting to assemble and operate
DANGER — ROTATING BLADES
To reduce the risk of injury, keep hands and feet away. Do not operate
unless discharge cover or grass catcher is in its proper place. If damaged,
DANGER — BYSTANDERS
Do not mow when children or others are around.
DANGER — HAND/ FOOT CUT
Keep hands and feet away from rotating parts.
DANGER — THROWN DEBRIS
Remove objects that can be thrown by the blade in any direction. Wear
safety glasses.
DANGER — SLOPES
Use extra caution on slopes. Do not mow slopes greater than 15°.
WARNING—GASOLINE IS FLAMMABLE
Allow the engine to cool at least two minutes before refueling.
WARNING— CARBON MONOXIDE
Never run an engine indoors or in a poorly ventilated area. Engine exhaust
contains carbon monoxide, an odorless and deadly gas.
WARNING— HOT SURFACE
Engine parts, especially the muffler, become extremely hot during opera-
tion. Allow engine and muffler to cool before touching.
3
Safety
Symbols
WARNING
This symbol points
out important safety
instructions which,
if not followed, could
endanger the per-
sonal 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!
1. Remove loose parts and any packing material which
may be between upper and lower handles.
a. Pull up and back on the upper handle to raise the
handle from position A. See Figure 1.
b. Tighten hand knobs (star knobs) securing upper
handle to lower handle. Make sure that each
carriage bolt is seated properly in the handle.
NOTE: On some models wing nuts have been replaced
with star knobs. Figures show wing nuts only.
2. Locate hairpin clip in one hole on the weld pin on each
side of lower handle.
a. Remove hairpin clip from this hole. Using a pair of
pliers, insert hairpin clip into the other hole on the
weld pin. Repeat on other side.
b. Place one carriage bolt (found in the hardware
pack included with your unit) in the upper hole of
the right handle mounting bracket from the inside
outward. See Figure 2. Secure with one wing nut
(star knobs). Repeat process on the left side.
3. The rope guide (pigs tail) is part of the grass catcher
support rod attached to the lower handle. See Figure 3.
a. Hold the blade control handle against the upper
handle. Position A.
b. Pull the starter rope out of the engine slowly until it
extends past the rope guide (pigs tail). Position B.
c. Guide the starter rope around the rope guide
(pig tail) until the rope is securely in the center.
Position C.
d. Tighten rope guide wing nut (star knob).
4. Insert post on cable ties into holes provided on the
lower handle. Pull cable tie tight and trim excess. See
Figure 4.
NOTE: Your unit is shipped as a mulcher with the
mulching plug installed.
Figure 3
Figure 2
Figure 1
Figure 4
Disconnect and
ground the spark
plug wire as instruct-
ed in the separate
engine manual.
IMPORTANT
This unit is shipped
WITHOUT GASOLINE
or OIL. After assembly,
service engine with
gasoline and oil as
instructed in the separate
engine manual packed
with your unit.
Setup and
Adjustments
Your mower is shipped
with the handle in the
higher height position.
NOTE: Each end of
the lower handle must
be placed in the same
relative position.
WARNING
NOTE: This owner’s manual covers various models of lawnmowers. The units illustrated may vary slightly
from your unit. Follow only those instructions which pertain to your model lawnmower.
Wing Nuts
Mulching
Plug
A
B
A
B
A
C
B
NOTE: Make certain
the drive cable is routed
around the outside and
above the lower handle
so it does not interfere
with attaching the grass
bag.
4
Figure 6
Figure 7
Never operate mower
unless grass bag,
side discharge chute
or mulching baffle is
firmly in place.
All mowers are
equipped with a rear
protective guard. The
guard helps eliminate
projectiles thrown by
the blade from injur-
ing the operator. DO
NOT REMOVE THIS
GUARD.
5. Bagging Grass Clippings.
a. Remove wing nuts holding mulching plug (see
Figure 4) or side discharge chute (see Figure 5) in
place. Then remove baffle or discharge chute.
b. Replace with bagging adapter (see Figure 6).
Attach using wing nuts. Be sure that inner lip of
attachment goes under the edge of the deck.
c. Lift flap and slide bag onto adapter. See Figure 7.
6. Side Discharge grass clippings.
a. Remove mulching plug or grass bag adapter.
b. Attach discharge chute with wing nuts. See Figure
5.
7. The height adjuster determines the cutting height of
the mower. The adjuster is located above the left rear
wheel. To adjust the cutting height, pull the lever out
and away from the mower and then move it forward or
back to select a new cutting height. See Figure 9.
NOTE: Some models are equipped with optional front
wheel casters. Refer to the Operation Section for
adjustment.
8. Use the adjustment wheel located on the underside
of the clutch control housing to tighten the drive belt
if mower does not self-propel with the drive clutch
control engaged, or if drive belt is slipping (unit
hesitates while engine maintains the same speed).
See Figure 8.
In addition, the adjustment wheel may also be used to
determine the position in which the drive clutch control
is engaged. If it is more comfortable to have the drive
engaged with the lever further away from the handle,
tighten the drive belt.
WARNING
Setup and
Adjustments
Figure 8
Side
Discharge
Chute
Wing Nuts
Grass Bag
Adapter
Wing Nuts
1
2
Loosen
Tighten
Drive Clutch Control
Shift Lever
Blade Control Handle
The blade control handle is located on the upper handle
of the mower. See Figure 9. The blade control handle
must be depressed in order to operate the unit. Release
the blade control handle to stop the engine and blade.
Drive Control Lever
Squeezing the drive control lever engages the drive
system. Releasing the clutch control disengages the
drive system. Release the clutch control to slow down
when negotiating an obstacle, making a turn or stopping.
Shift Lever
The shift lever is located on the drive control housing
on the upper handle. See Figure 9. This lever is used to
select the forward speed of the mower. When changing
your speed selection, release the drive clutch control.
Mulching Plug
The mulching plug is used to close the side discharge
chute opening when mulching or bagging grass. Do
not remove the hinged mulching plug at any time, even
when you are not mulching.
Recoil Starter
The recoil starter is attached to the right upper handle.
Stand behind the unit and pull the recoil starter rope to
start the unit.
Know Your Lawn Mower
Rear Cutting Height Adjustment Lever
The height adjuster determines the cutting height of the
mower. The adjuster is located above the left rear wheel.
Casters (optional)
The front wheel cutting height is determined by the
selection of one of six positions in each caster assembly.
See Figure 9.
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 in the square hole desired, through the
wheel assembly and secure with the wing nut previously
removed.
IMPORTANT: All wheels must be placed in the same
relative position.
NOTE: For rough or uneven lawns, move the height
adjustment lever to a higher position. This will help stop
scalping.
Caster Lock (optional)
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
WARNING
Figure 9
Height Adjustment Lever
Caster
Locking Pin
Grass
Catcher
Side Deflector
Mulch Plug
* Casters are
optional equipment
Axle Bolt and
Spring Washer
Blade Control
Recoil
Starter
Drive Control
Shift Lever
Read, understand,
and follow all instruc-
tions and warnings
on the machine and
in this manual before
operating.
This blade control
mechanism is a
safety device. Never
attempt to bypass its
operations.
Use extreme care
when handling
gasoline. Gasoline is
extremely flammable
and the vapors are
explosive. Never fuel
the machine indoors
or while the engine
is hot or running.
Extinguish cigarettes,
cigars, pipes and
other sources of
ignition.
The operation of any
lawn mower can result
in foreign objects
being thrown into
the eyes, which can
damage your eyes
severely. Always wear
safety glasses while
operating the mower,
or while performing
any adjustments or
repairs on it.
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. En-
gine 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.
Figure 10
in the larger holes for locked, straight ahead operation,
place pins in smaller holes to allow casters to rotate
freely.
Before Starting
1. Service the engine with gasoline and oil as instructed
in the separate engine manual.
2. Attach spark plug wire to spark plug. If unit is
equipped with a rubber boot over the end of the
spark plug wire, make certain the metal loop on the
end of the spark plug wire (inside the rubber boot)
is fastened securely over the metal tip on the spark
plug.
3. Before each use, check for proper drive clutch
operation by performing the following before starting
the engine:
a. With the drive control released, push mower
forward. It should move freely. Pull mower back-
ward. It should move with only a small amount of
resistance.
b. If it does not the clutch may not be releasing
completely. Do not start the engine until correc-
tions have been made. Check the control cable
for severe bend, kinks and binding. Also check for
grass build-up around the belt.
To Start Engine and Engage Blade
1. If your unit is equipped with a primer, choke or fuel
valve lever, operate as instructed in the separate
engine manual packed with your unit.
2. Standing behind the unit, depress the blade control
handle and hold it against the upper handle as shown
in Figure 10.
3. Grasp the starter handle as shown and pull slowly
until resistance is felt, then pull rapidly to start engine
and avoid kickback. Return it slowly to the rope guide.
4. To engage the drive, squeeze the drive control handle
towards the upper handle. Release the drive control
to slow down when negotiating an obstacle, making a
turn, or stopping.
5. The six speed shift lever is located on the drive clutch
control housing on the upper handle. See Figure 9.
This lever is used to select the operating speed of
the mower. Release the drive clutch control when
changing speeds.
To Stop Engine
1. Release the blade control handle to stop the engine
and blade.
WARNING: The blade continues to rotate
for a few seconds after the engine is shut
off.
2. Disconnect and ground the spark plug wire as
instructed in the separate engine manual to prevent
accidental starting while equipment is unattended.
Using Your Lawn Mower
Be sure the lawn is clear of stones, sticks, wire, or other
objects which could damage the lawn mower or the
engine. Such objects could be accidently thrown by the
mower in any direction and cause serious personal injury
to the operator and others.
WARNING: If you strike a foreign ob-
ject, stop the engine. Remove wire from
the spark plug, thoroughly inspect the
mower for any damage, and repair the
damage before restarting and operating
the mower. Extensive vibration of the
mower during operation is an indication
of damage. The unit should be promptly
inspected and repaired.
IMPORTANT: Move the shift lever ONLY when the
engine is running. Shifting the speeds with the engine off
can cause damage to the unit. Disengage the drive clutch
control before changing the speed selection.
Operating Tips
1. For best results do not cut wet grass.
2. New grass, thick grass, or wet grass may require a
narrower cut.
3. If the grass has been allowed to grow in excess of 4
inches, mulching is not recommended. Mow using
the side discharge to reduce the grass height to 3-1/4
inches or less before mulching.
4. Periodically check all fasteners and make sure these
are tight.
NOTE: To operate your unit using the grass bag, mulcher
or optional side discharge refer to page 7.
3
1
2
3
1. Lubricate the pivot points on the blade control handle
at least once a season with light oil. The blade
control must operate freely in both directions. See
Figure 11.
2. If your mower is equipped with ball bearing wheels,
lubricate at least once a season with a light oil, all
other types require no lubrication. However, if the
wheels are removed for any reason, lubricate the
surface of the axle bolt and the inner surface of the
wheel with light automotive oil.
3. Lubricate the torsion spring and pivot point periodi-
cally with light oil to prevent rust. See Figure 11.
4. The transmission is pre-lubricated and sealed at the
factory and does not require lubrication.
5. Follow the accompanying engine manual for lubrica-
tion schedule and instruction.
Engine
1. Refer to the separate engine manual for engine
maintenance instructions.
2. Maintain engine oil as instructed in the separate
engine manual packed with your unit. Read and
follow instructions carefully.
3. Under normal conditions service air cleaner as in-
structed in the separate engine manual packed with
your unit. Clean every few hours under extremely
dusty conditions. Poor engine performance and
flooding usually indicates that the air cleaner should
be serviced.
4. 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.
NOTE: This spark ignition system meets all require-
ments of the Canadian Interference-Causing Equipment
Regulations.
5. Clean the engine regularly with a cloth or brush.
Keep the cooling system (blower housing area) clean
to permit proper air circulation which is essential to
engine performance and life. Be certain to remove all
grass, dirt and combustible debris from muffler area.
Deck
The underside of the mower deck should be cleaned after
each use to prevent a buildup of grass clippings, leaves,
dirt or other matter. If this debris is allowed to accumulate,
it will invite rust and corrosion, and may prevent proper
mulching.
The deck may be cleaned by tilting the mower and scrap-
ing clean with a suitable tool (make certain the spark plug
wire is disconnected).
Replacing Rear Flap
The rear flap is attached to the back of the mower deck. If
the rear flap becomes damaged replace it.
1. To remove rear flap, lift rear door, remove screw, and
press flap in on either side to remove from hole.
2. Remove screw and flap from opposite hole and
replace with new flap in the opposite order and
manner of removal.
Six speed shift cable adjustment
Periodic adjustment of the six speed shift cable may
be required due to normal stretch and wear on the
cable. Adjustment is needed if all six speeds cannot be
obtained.
The adjustable cable bracket is located on the left side
of the mower, beside the engine. Start engine and place
shift lever in the sixth speed position. Stop engine and
disconnect spark plug wire and ground it against engine.
1. Loosen the hex nut which secures the adjustable
cable bracket. See Figure 12.
2. Pull backward on the bracket (toward the rear of the
mower).
3. Tighten the hex nut.
Lubricate these
points before
reassembly.
Always stop engine,
disconnect spark
plug, and ground
against engine before
cleaning, lubricating
or doing any kind of
maintenance on your
machine.
Cutting grass in
sandy soil condition
causes abrasive wear
to the blade.
If unit is tipped for
easier access to
blade or belt, tip
mower as specified
in separate engine
manual. If it does not
specify turn mower
on its side making
sure that the air filter
and the carburetor
are up.
Maintenance
1
2
3
Figure 12
Periodically inspect the blade adapter for cracks,
especially if you strike a foreign object. Replace when
necessary. Follow the steps below for blade service:
1. Remove the bolt and the blade bell support which
hold the blade and the blade adapter to the engine
crankshaft. See Figure 13.
2. Remove blade and adapter from the crankshaft.
3. The blade may be resharpened by removing it and
either grinding or filing the cutting edge keeping as
close to the original bevel as possible. Do not attempt
to sharpen the blade while it is still on the mower.
4. It is extremely important that each cutting edge
receives an equal amount of grinding to prevent an
unbalanced blade.
NOTE: Improper blade balance will result in excessive
vibration causing eventual damage to the engine and
mower. Be sure to carefully balance blade after sharpen-
ing. Possible damage resulting from blade unbalance
condition is not the responsibility of the manufacturer.
NOTE: Always remove blade from the adapter for testing
balance.
5. The blade can be tested for balance by balancing it
on a round shaft screwdriver. Remove metal from the
heavy side until it balances evenly.
6 Before reassembling the blade and the blade adapter
to the unit, lubricate the engine crankshaft and the
inner surface of the blade adapter with light oil.
7. Install the blade adapter on the crankshaft with the
“star” away from the engine. See Figure 13. Place
the blade with the side marked “bottom” (or with part
number) facing away from the adapter. Align the blade
bell support over the blade with the tabs in the holes
of the blade and insert the hex bolt.
8. Tighten the hex bolt to the torque listed below:
Blade Mounting Torque
Center Bolt 450 in. lb. min., 600 in.lb. max.
To insure safe operation of your unit, ALL nuts and bolts
must be checked periodically for correct tightness.
Belt Care
1. Disconnect the spark plug wire and ground it against
the engine.
2. Drain the fuel tank or place a piece of plastic beneath
the cap to prevent gasoline leakage.
3. Place shift lever in the first position and tip the mower
on its side. (air cleaner side of engine up).
4. Remove the blade and blade adapter as described
previously.
5. Move rear height adjuster to the highest position.
6. Using a 3/8” socket remove three hex screws holding
the baffle to the deck. See Figure 13.
7. Pivot baffle towards the rear of the mower. See Figure 14.
8. Remove the hex bolt holding the transmission to the
mower housing. See Figure 14.
Maintenance
We do not recommend
the use of pressure
washers or garden
hose to clean your
unit. These may cause
damage to electrical
components, spindles,
pulleys, bearings, or
the engine. The use
of water will result in
shortened life and
reduce serviceability.
When removing the
cutting blade or belt,
protect your hands
with a pair of heavy
gloves or use a heavy
rag to hold the blade.
An unbalanced blade
will cause excessive
vibration when rotat-
ing at high speeds. It
may cause damage
to mower, and could
break causing per-
sonal injury.
A
B
A
B
9. Tilt the transmission forward and loosen the idler
pulley bolt and locknut ½ turn using two 7/16”
wrenches. See Figure 15.
Always stop engine,
disconnect spark
plug, and ground
against engine before
cleaning, lubricating
or doing any kind of
maintenance on your
machine.
Cutting grass in
sandy soil condition
causes abrasive wear
to the blade.
If unit is tipped for
easier access to
blade or belt, tip
mower as specified
in separate engine
manual. If it does not
specify turn mower
on its side making
sure that the air filter
and the carburetor
are up.
Maintenance
10. Using a pair of pliers, pull back and rotate belt keeper
bracket from the slot on idler pulley.
11. Slide the belt out from between the belt keeper
bracket and the idler pulley. See Figure 16.
12. Squeeze the belt together and push belt forward.
Press the control arm inward towards the deck and
remove the six speed cable from the slot. See Figure
17.
13. Pivot the control arm down away from the pulley and
belt.
14. Lift off the lower pulley assembly and remove the old
belt from around the crankshaft.
15. Place the new belt over the transmission pulley. Start
the belt in pulley groove and rotate pulley until belt is
seated in transmission pulley.
16. Place belt between idler pulley and the belt keeper
bracket.
17. Using pliers, rotate the belt keeper bracket so that it
snaps into slot on the idler bracket.
18. Tighten the idler pulley bolt and locknut ½ turn using
two 7/16” wrenches.
19. Place belt between the two pulley halves on the
crankshaft. Make sure to route the belt inside the belt
guard pin. See Figure 18.
20. 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.
21. Pivot the control arm back to its original position and
reinstall the six-speed cable into the slot.
22. Check and make sure the belt is routed inside the
pulley halves and the belt guard pin.
23. Reinstall the bolt securing transmission to rear mower
housing.
Belt Guard
Pin
Figure 16
Six speed
cable slot
Figure 17
Figure 18
Figure 19
24. Pivot the baffle back to its original position and secure
with three hex screws earlier removed. You will need a
3/8” socket for these screws.
25. Lightly lubricate the crankshaft and reinstall blade
and blade adapter as described in the “Cutting Blade”
section.
26. Tip the mower back on its wheels.
27. Make certain to retest the unit for neutral as instructed
in the Operation Section.
Off-Season Storage
The following steps should be taken to prepare your
lawn mower for storage.
1. Clean and lubricate mower thoroughly as described
in the lubrication instructions.
2. We do not recommend the use of a pressure washer
or garden hose to clean your unit.
3. Refer to engine manual for correct engine
storage instructions.
4. Coat mower’s cutting blade with chassis grease to
prevent rusting.
5. 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 of your lawn mower before storage.
6
WARNING
Maintenance
This spark ignition
system meets all
requirements of the
Canadian Interference-
Causing Equipment
Regulations.
When removing the
cutting blade or belt,
protect your hands
with a pair of heavy
gloves or use a heavy
rag to hold the blade.
An unbalanced blade
will cause excessive
vibration when rotat-
ing at high speeds. It
may cause damage
to mower, and could
break causing per-
sonal injury.
For repairs beyond
the minor adjust-
ments listed here,
contact an authorized
service dealer.
7
Trouble
Shooting
Cause
Problem
Remedy
Engine fails to start
1. Blade control handle disengaged.
2. Spark plug wire disconnected.
3. Fuel tank empty or stale fuel.
4. Engine not primed.
5. Faulty spark plug.
6. Blocked fuel line.
7. Engine flooding.
8. Fuel valve (if quipped) closed.
9. Engine not choked (if equipped with
choke).
10. Burnt fuse. (Electric Start only).
1. Engage blade control handle.
2. Connect wire to spark plug.
3. Fill tank with clean, fresh gasoline.
4. Refer to engine manual.
5. Clean, adjust gap, or replace.
6. Clean fuel line.
7. Wait a few minutes to restart, but do not prime.
8. Open fuel valve. See engine manual.
9. Choke engine. See engine manual.
10. Replace fuse (see Maintenance Section).
Engine runs erratic
1. Connect and tighten spark
plug wire.
2. Clean fuel line; fill tank with clean, fresh
gasoline.
3. Clear vent.
4. Drain fuel tank and carburetor. Refill with fresh
fuel.
5. Refer to engine manual.
6. Refer to engine manual.
1. Spark plug wire loose.
2. Blocked fuel line or stale fuel.
3. Gas cap vent plugged.
4. Water or dirt in fuel system.
5. Dirty air cleaner.
6. Carburetor out of adjustment.
Engine overheats
1. Fill crankcase with proper oil.
2. Refer to the engine manual packed with your
unit.
3. Remove blower housing and clean.
4. Refer to engine manual.
1. Engine oil level low.
2. Dirty air filter.
3. Air flow restricted.
4. Carburetor not adjusted properly.
Occasional skip (hesitates)
at high speed
1. Adjust gap to .030”. Refer to engine manual.
2. Refer to engine manual.
1. Spark plug gap too close.
2. Carburetor idle mixture adjustment
improperly set.
Idles poorly
1. Reset gap to .030” or replace spark plug.
Refer to engine manual.
2. Refer to engine manual.
3. Refer to engine manual.
1. Spark plug fouled, faulty or gap too
wide.
2. Carburetor improperly adjusted.
3. Dirty air cleaner.
1. Cutting Blade loose or unbalanced.
2. Bent cutting blade.
1. Tighten blade and adapter. Balance blade
2. Replace blade.
Excessive vibration
1. Wheels not positioned correctly.
2. Dull blade.
Uneven cut
1. Place all four wheels in same height position.
2. Sharpen or replace blade.
1. Wet grass.
2. Excessive 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.
Mower will not mulch
grass
1. Belt not installed properly.
2. Debris clogging drive operation.
1. Checking belt for proper pulley installation and
movement.
2. Clean out debris.
Wheels will not propel
For parts and/or
accessories refer to
customer support on
page 2.
Component
Part Number and Description
734-2044B
Wheel (Rear)
734-2004A
Wheel (Front, models w/o front wheel casters)
734-1857
Wheel (Front, models w/ front wheel casters)
731-1832 Side Discharge Chute
664-0076A
Grass Bag
942-0741A Mulching Blade
954-0460 V-Belt
725-04329† Battery Charger
925-04323† Battery
925-0201† Key
† If Equipped
For equipment purchased in Canada only.
THREE YEAR LIMITED WARRANTY
The limited warranty set forth below is given by MTD Products Limited with respect to new merchandise purchased and used in Canada and/or its territories
and possessions (either entity respectively, “MTD”).
MTD warrants this product (excluding its normal wear parts as described below) against defects in material and workmanship for a period of three (3) 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 workman-
ship. This limited warranty shall only apply if this product has been operated and maintained in accordance with the Operator’s Manual furnished with the
product, and has not been subject to misuse, abuse, commercial use, neglect, accident, improper maintenance, alteration, vandalism, theft, fire, water, or
damage because of other peril or natural disaster. Damage resulting from the installation or use of any part, accessory or attachment not approved by MTD for
use with the product(s) covered by this manual will void your warranty as to any resulting damage.
Normal wear parts are warranted to be free from defects in material and workmanship for a period of thirty (30) days from the date of purchase. Normal wear
parts include, but are not limited to items such as: batteries, belts, blades, blade adapters, grass bags, rider deck wheels, seats, snow thrower skid shoes,
friction wheels, shave plates, auger spiral rubber, tires, engine oil, air filters and spark plugs.
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;
In the U.S.A.: Check your Yellow Pages, or contact MTD LLC at P.O. Box 361131, Cleveland, Ohio 44136-0019, or call 1-800-800-7310 or 1-330-220-4683 or
log on to our Web site at www.mtdproducts.com.
In Canada: Contact MTD Products Limited, Kitchener, ON N2G 4J1, or call 1-800-668-1238 or log on to our Web site at www.mtdcanada.com.
This limited warranty does not provide coverage in the following cases:
a. The engine or component parts thereof. These items may carry a separate manufacturer’s warranty. Refer to applicable manufacturer’s warranty for terms
and conditions. The Powermore engine is not excluded under this agreement.
b. Log splitter pumps, valves, and cylinders have a separate one-year warranty.
c. Routine maintenance items such as lubricants, filters, blade sharpening, tune-ups, brake adjustments, clutch adjustments, deck adjustments, and normal
deterioration of the exterior finish due to use or exposure.
d. Service completed by someone other than an authorized service dealer.
e. MTD does not extend any warranty for products sold or exported outside of Canada, including possessions and territories.
f. Replacement parts that are not genuine MTD parts.
g. Transportation charges and service calls.
h. If Products are used commercially. (MTD may separately offer Limited Commercial Warranties on certain select products. Ask your dealer or retailer for
details or contact MTD Service for more information.)
No implied warranty, including any implied warranty of merchantability of fitness for a particular purpose, applies after the applicable period of
express written warranty above as to the parts as identified. No other express warranty, whether written or oral, except as mentioned above, given
by any person or entity, including a dealer or retailer, with respect to any product, shall bind MTD. During the period of the warranty, the exclusive
remedy is repair or replacement of the product as set forth above.
The provisions as set forth in this warranty provide the sole and exclusive remedy arising from the sale. MTD shall not be liable for incidental
or consequential loss or damage including, without limitation, expenses incurred for substitute or replacement lawn care services or for rental
expenses to temporarily replace a warranted product.
Some jurisdictions 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 LOCAL LAWS RELATE TO THIS WARRANTY: This limited warranty gives you specific legal rights, and you may also have other rights that
vary in different jurisdictions.
IMPORTANT: Owner must present Original Proof of Purchase to obtain warranty coverage.
MTD LLC, P.O. BOX 361131 CLEVELAND, OHIO 44136-0019; Phone: 1-800-800-7310, 1-330-220-4683
MTD Products Ltd., P. O. BOX 1386, KITCHENER, ON N2G 4J1; Phone: 1-800-668-1238
For equipment purchased in United States only.
CONSUMER’S WARRANTY
COLUMBIA OUTDOOR
THREE YEARS- 120 Hrs. LIMITED WARRANTY
For three (3) years-120 hrs. whichever come first, from the date of original purchase of COLUMBIA products, COLUMBIA will
either repair or replace, at its option, free of charge, F.O.B. factory or authorized service firm, any part found to be defective in
material and workmanship. All transportation charges on parts submitted for replacement under this warranty must be paid by
the purchaser unless return is requested by COLUMBIA.
This warranty DOES NOT apply to any part which has become inoperative through misuse, excessive use, accident, neglect,
improper maintenance or alterations by unauthorized persons.
This limited warranty does not extend to the replacement of parts which are not defective, but where regular usage has ex-
hausted the life of the part.
TRACTOR ATTACHMENT WARRANTY
Mower decks included with, or sold separately, as an attachment for COLUMBIA garden tractors will be warranted according to
the above terms of the COLUMBIA THREE (3) YEARS - 120 hrs. limited consumer warranty.
ALL OTHER ATTACHMENTS will be sold under the same conditions as above except the warranty will be ONE YEAR FROM
DATE OF ORIGINAL PURCHASE.
ENGINES, ELECTRIC START KITS, HYDROGEAR, PEERLESS TRANSMISSIONS AND PEERLESS TRANSAXLES ARE WAR-
RANTED BY THEIR RESPECTIVE MANUFACTURER. ALL CLAIMS AGAINST THESE COMPONENTS MUST BE HANDLED
THROUGH THE RESPECTIVE MANUFACTURERS SERVICE DEALERS.
Belts, light bulbs, clutch parts (friction wheels), grass bags, tires, seats, rider deck wheels and cutting blades are covered by a 60
day limited warranty.
Batteries are warranted against defect for 90 days at 100% of their value and 50% of their value for the period between the 91st
day and the 120th day.
Fuses, shear bolts and blade adapters are considered consumable items and as such are not warranted.
Note: Regular maintenance replacement parts and related inspections and adjustments are excluded from coverage when made
as part of normal maintenance service.
EXTERIOR FINISH
NORMAL DETERIORATION OF THE EXTERIOR FINISH DUE TO USE OR EXPOSURE TO THE ELEMENT, CORROSIVE
PRODUCTS ETC… IS NOT WARRANTED. LABELS ARE COVERED FOR 1 YEAR FROM THE ORIGINAL DATE OF PUR-
CHASE.
PERSONAL USE
THE FOREGOING PARAGRAPHS CONSTITUTE COLUMBIA’S ENTIRE WARRANTY WITH RESPECT TO ANY PRODUCT
PURCHASED AND USED FOR PERSONAL, FAMILY, HOUSEHOLD/RESIDENTIAL PURPOSES, AS DISTINGUISHED FROM
COMMERCIAL USAGE.
COMMERCIAL USE
ALL APPLICATIONS OTHER THAN PERSONAL USE AS OUTLINED ABOVE, ARE CONSIDERED COMMERCIAL USAGE.
COLUMBIA products purchased by a company or used for commercial purposes are not covered by any warranty.
WARRANTY SERVICE CAN ONLY BE PERFORMED BY AN AUTHORIZED COLUMBIA SERVICE DEALER. ANY NON-
ORIGINAL EQUIPMENT REPLACEMENT PART USED ON OR IN A PRODUCT UNDER WARRANTY WILL BE EXCLUDED
FROM THAT WARRANTY COVERAGE, AS WILL BE ANY RELATED DAMAGED COMPONENTS RESULTING FROM THE
INSTALLATION OF A NON-COLUMBIA REPLACEMENT PART.
MTD LLC, P.O. BOX 361131 CLEVELAND, OHIO 44136-0019; Phone: 1-800-800-7310, 1-330-220-4683