Operator’s Manual
21” Self Propelled
Mulching Mower
Model No.
12A-559K401
IMPORTANT: Read safety rules and instructions carefully before operating equipment.
Warning:
covered, brush-covered or grass-covered land unless the engine’s exhaust system is equipped with a spark arrester meeting
applicable local or state laws (if any). If a spark arrester is used, it should be maintained in effective working order by the operator.
In the State of California the above is required by law (Section 4442 of the California Public Resources Code). Other states may have
similar laws. Federal laws apply on federal lands. A spark arrester for the muffler is available through your nearest engine authorized
service dealer or contact the service department, P.O. Box 368022 Cleveland, Ohio 44136-9722.
This unit is equipped with an internal combustion engine and should not be used on or near any unimproved forest-
MTD PRODUCTS INC. P.O. BOX 368022 CLEVELAND, OHIO 44136-9722
PRINTED IN U.S.A.
FORM NO.
770-10145A
(12/99)
TABLE OF CONTENTS
Content Page
Maintaining Safe Operation Practices ...............................................................3
Slope Guage......................................................................................................6
Hardware Pack ..................................................................................................7
Unpacking..........................................................................................................7
Assembling Your Lawn Mower...........................................................................7
Know Your Lawn Mower ....................................................................................9
Operating Your Lawn Mower .............................................................................10
Maintaining Your Lawn Mower...........................................................................12
Service...............................................................................................................13
Off-Season Storage...........................................................................................16
Troubleshooting.................................................................................................17
Parts List............................................................................................................18
FINDING MODEL NUMBER
This Operator’s Manual is an important part of your new Lawn Mower. It will help you assemble, prepare
and maintain the unit for best performance. Please read and understand what it says.
Before you start assembling your new equipment, please locate the model plate on the
equipment and copy the information from it in the space provided below. The information on
the model plate is very important if you need help from our Customer Support Department or
an authorized dealer.
• You can locate the model number by standing behind the unit in the operating position and looking
down at the cutting deck. A sample model plate is explained below. For future reference, please copy
the model number and the serial number of the equipment in the space below.
(Model Number)
CLEVELAND, OHIO 44136
(Serial Number)
MTD PRODUC TS INC
Copy the model number here:
Copy the serial number here:
CALLING CUSTOMER SUPPORT
If you have difficulty assembling this product or have any questions regarding the controls, operation or
maintenance of this unit, please call the Customer Support Department.
Call 1- (330) 220-4MTD (4683) or 1- (800)-800-7310 to reach a Customer Support
representative. Please have your unit’s model number and serial number ready when you
call. See previous section to locate this information. You will be asked to enter the serial
number in order to process your call .
2
SECTION 1: MAINTAINING 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 INSTRUCTION S IN THIS MA NUAL B EFORE ATTEMP TING
TO OPERATE YOUR LAWN MOWER. FAILURE TO COMPLY WITH THESE INSTRUCTIONS MAY
RESULT IN PER SONAL INJ URY. WHE N YOU SE E THIS SY MBOL, H EED 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
manual. As with any ty pe of power equipment, carelessnes s or error on the part of the oper ator can
result in serious in jury. This lawn mow er is capable of am putating han ds and feet and thro wing objects.
Failure to observe the following safety instructions could result in serious injury or death.
: Your lawn mower was built to be operated according to the ru les for safe operation in this
GENERAL OPERA TION
• Read this operator’s manual carefully in its entirety
before attempting to assemble this machine. Read,
understand, and follow all instructions on the
machine and in the manual(s) before operation. Be
completely familiar with the controls and the 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.
• Your rotary mower is a precision piece of power
equipment, not a plaything. Therefore, exercise
extreme caution at all times. Your unit has been
designed to perform one job: to mow grass. Do not
use it for any other purpose.
• Never allow children under 14 years old to operate
a power mower. Children 14 years old and over
should only operate mower under close parental
supervision. Only responsible individuals who are
familiar with these rules of safe operation should be
allowed to use your mower.
• Keep the area of operation clear of all persons,
particularly small children and pets. Stop engine
when they are in the vicinity of your mower to help
prevent blade contact or thrown object injury.
Although the area of operation should be
completely cleared of foreign objects, an object
may have been overlooked and could be
accidenta lly thrown by the mower in an y directi on
and cause serious personal injury to the operator or
any others allowed in the area.
• Wear sturdy, rough-soled work shoes and closefitting slacks and shirts. Shirts and pants that cover
the arms and legs and steel-toed shoes are
recommended. Do not wear loose fitting clothes or
jewelry. They can be caught in moving parts. Never
operate a unit in bare feet, sandals, slippery or light
weight (e.g. canvas) shoes.
• Always wear safety glasses or safety goggles
during operation or while performing an adjustment
or repair, to protect eyes from foreign objects that
may be thrown from the machine in any direction.
• Thoroughly inspect the area where the equipment
is to be used. Remove all stones, sticks, wire,
bones, toys and other foreign objects which could
be picked up and thrown by the mower in any
direction and cause serious personal injury to the
operator or an y others al lowed in th e area. Pla n
your mowing pattern to avoid discharge of material
toward roads, sidewalks, bystanders and the like.
To help avoid a thrown objects injury, keep
children, bystanders and helpers at least 75 feet
from the mower while it is in operation.
• Do not put hands or feet near or under rotating
parts. Keep clear of discharge opening at all times
as the rotating blade can cause injury.
• Many injuries occur as a result of the mower being
pulled over the foot during a fall. Do not hang on to
the mower if you are falling; release the handle
immediately.
• Never pull the m ower towar d you while you ar e
walking. If yo u must back th e mower away from a
wall or obstruction first look down and behind, and
then follow these steps:
• Step back from the mower to fully extend your
arms.
• Be sure you are we ll balan ced with sur e footin g.
• Pull the mower back slowly, no more than half way
toward you.
• Repeat these steps as needed.
• Do not operate the mower while under the influence
of alcohol or drugs.
• Do not engage the self-propelled mechanism on
units so equipped while starting engine.
3
• The blade control handle is a safety device. Never
attempt to bypass its operation. Doing so makes
the safety device inoperative and may result in
personal injury through contact with the rotating
blade. The blade control handle must operate
easily in both directions and automatically return to
the disengaged position when released.
• Never operate the mower in wet grass. Always be
sure of your footing. A slip and fall can cause
serious personal injury. Keep a firm hold on the
handle and walk, never run. If you feel you are
losing your footing, RELEASE THE BLADE
CONTROL HANDLE IMMEDIATELY and the blade
will stop rotating within three seconds.
• Mow only in daylight or good artificial light.
• Stop the blade when crossing gravel drives, walks
or roads.
• If the equipment should start to vibrate abnormally,
stop the engine and check immediately for the
cause. Vibration is generally a warning of trouble.
• Shut the engine off and wait until the blade comes
to a complete stop before removing the grass
catcher or unclogging the chute. The cutting blade
continues to rotate for a few seconds after the
engine is shut off. Never place any part of the body
in the blade area until you are sure the blade has
stopped rotating.
• Never operate mower without proper guards, grass
catcher, plates or other safety protective devices in
place.
• Muffler and engine become hot and can cause a
burn. Do not touch.
• Only use accessories approved for this machine by
the manufacturer. Read, understand, and follow all
instructions provided with the approved accessory.
• If situations occur which are not covered in this
manual, use care and good judgment. Contact your
dealer for assistance.
SLOPE OPERA TI ON
For your safety, use the slope gauge included as part of this
manual to measure slopes before operating this unit on a
sloped or hilly area. If the slope is greater than 15 degrees
as shown on the slope gauge, do not operate this unit on
that area or serious injury could result.
DO:
• Mow across the face of slopes; never up and down.
Exercise extreme caution when changing direction
on slopes.
• 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 in less
than 3 seco nds.
• Watch for holes, ruts, hidden objects, or bumps.
Tall grass can hide obstacles.
DO NOT :
• Do not mow near drop-offs, ditches or
embankments. The operator could lose footing or
balance.
• Do not mow slopes greater than 15 degrees as
shown on the slope gauge.
• Do not mow on wet grass. Reduced footing could
cause slipping.
CHILDREN
Tragic acci dents can oc cur if the op erator is not alert to
the presen ce of ch ildren. Childr en are o ften att racted to
the mower and the mowing activity. Never assume that
children will remain where you last saw them.
• Keep children out of the mowing area and under
the watchful care of a responsible adult other than
the operator.
• Be alert and turn mower off if a child enters the
area.
• Before and while moving backwards, look behind
and down for small children or other objects.
• Never allow children under age 14 to operate the
mower. Children 14 years of age and above should
read and understand the operation instructions and
safety rules in this manual.
• Use extreme care when approaching blind corners,
shrubs, trees, or other objects that may obscure
your vision of a child or hazard.
SERVICE
• Use extreme care in handling gasoline and other
fuels. They are extremely flammable and the vapors
are explosive.
• Use only an approved gasoline container.
• Never remove gas ca p or add fuel while the engine is
running. Allow engine to cool at least two minutes
before refueling.
• Replace gasoline cap securely and wipe off any
spilled gasoline before starting the engine as it may
cause a fire or explosion.
• Extinguish all cigarettes, cigars, pipes and other
sources of ignition.
• Never refuel machine indoors because flammable
vapors will accumulate in the area.
• Never store the machine or fuel container inside
where there is an open flame or spark such as a gas
water heater, space heater, or furnace.
• Never run an engine inside a closed area.
• To reduce fire hazard, keep mower free of grass,
leaves, or other debris build-up. Clean up oil or fuel
spillage. Allow mower to cool at least 5 minutes
before storing.
4
• Before cleaning, repairing, or inspecting, make
certain the blade and all moving parts have stopped.
Disconnect the spark plug wire, and keep the wire
away from the spark plug to prevent accidental
starting.
• Check the blade and engine mounting bolts at
frequent intervals for proper tightness. Also, visually
inspect blade for damage (e.g., bent, cracked or
worn). Replace with blade which meets original
equipment specifications listed in this manual.
• Keep all nuts, bolts, and screws tight to be sure the
equipment is in safe working condition.
• Never tamper with safety devices. Check their proper
operation regularly.
• We do not recommend the us e of pressure washers
or garden ho se to clean your unit. Th ey may cause
damage to electric components, spindles, pulleys,
bearings or the engine. The use of water will result in
shortened life and reduce serviceability.
• After striking a foreign object, stop the engine,
remove the wire from the spark plug, and thoroughly
inspect the mower for any damage. Repair the
damage before starting and operating the mower.
• Never attempt to make a wheel or cutting height
adjustment while the engine is running.
• Grass catcher components are subject to wear,
damage and deterioration, which could expose
moving parts or allow objects to be thrown. For safety
protection, frequently check components and replace
with manufacturer’s recommended parts, when
necessary.
• Mower blades are sharp and can cut. Wrap the
blade(s) or wear gloves, and use extra caution when
servicing them.
• Do not change the engine governor setting or
overspeed the engine. Excessive engine speeds are
dangerous.
WARNING - YOUR RESPONSIBILITY: Restrict the use of this power machine to p ersons who read,
understand and follow the warnings and instructions in this manual and on the machine.
5
SECTION 2: SLOPE GAUGE
Use this page as a guide to determine slopes where you may not operate safely.
your footing and you could slip, resulting in serious injury.
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
F
O
L
D
O
Operate RIDING mowers up and down slopes, never across the face of slopes.
N
D
R
P
E
R
O
T
T
E
D
L
I
N
E
,
A CORNER OF A BUILDING
OR A FENCE POST
SIGHT AND HOLD THIS LEVEL WITH A VERTICAL TREE
A POWER POLE
WARNING
15
o
E
S
E
N
T
I
N
G
A
1
5
o
S
L
O
P
E
6
SECTION 3: HARDWARE PACK
Please identify each piece of the hardware pack as
shown in Figure 1.
Wing Nut 1/4-20 (2) Carriage Bolt 1/4-20 (2)
SECTION 4: UNPACKING
Figure 1
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 included with unit (i.e.,
operator’s manual, oil, etc.).
• Cut corners and lay carton down flat. Remove
packing material.
• Roll or slid e uni t out of ca rton. C heck c arton
thoroughly for loose parts.
NOTE: Make sure not to crimp the cables while
removing the loose parts or the entire unit from the
carton.
NOTE: Reference to right or left hand side of the mower
and/or front or behind th e mower is obs erved from the
operating position.
SECTION 5: ASSEMBLING YOUR LAWN MOWER
Tools Required
• Pair of Pliers
• Funnel
• Set of adjustable wrenches
Disconnecting Spar k Plug
• Before setting up your lawn mower, disconnect the
spark plug wire from the spark plug, and ground it
against the engine. See Figure 2.
• Attach the spark plug wire to a bolt on the engine to
ground it.
Assembling Handle
• Remove grass bag from the unit and set it out of the
way. See Figure 3 (step 1).
• Remove any packing material which may be
between the upper and lower handles for shipping
purposes.
2. Lift lower handle
1. Move bag
away
Spark Plug
Wire
Figure 2
3. Lift upper
handle
Spark Plug
Figure 3
• Raise the lower handle in the direction shown in
Figure 3 (st ep 2) till it snaps in to plac e.
7
• Raise the upper handle in the direction shown in
Figure 3 (step 3). Tighten the wing nuts which are
already on the handle. See Figure 4.
Upper Handle
Lower Handle
Tighten
wing nut
Cable Tie
Lower
Handle
Figure 6
Figure 4
NOTE: Make sur e to route the cables insi de the lower
handle. Also do not crimp the cables wh ile lifting the
handle up.
• For shipping purposes, the hairpin clip is placed in
the outer hole of the weld pin on the lower handle.
Remove the hairpin clip from the outer hole of the
weld pin.
• Using a pair of pliers, insert the hairpin clip into the
inner hole in the weld pin. Repeat on other side.
See Figure 5.
Carriage Bolt
Upper Hole
Handle
Mounting
Brkt.
Wing Nut
Attaching Starter Rope
The rope guide is already attached to the right side of
the upper handle of your mower. See Figure 7.
• 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.
• Slip the rope through the rope guide as shown
below. Tighten the wing nut holding the rope guide
to the upper handle.
Starter
Rope
Rope Guide
Figure 7
NOTE: Leave rear mulching baffle in if your want to use
your mower as a mulcher.
Wing Nut
Upper Handle
Lower Handle
Figure 5
• After you have moved the hairpin clip, install the
carriage bolt, (carriage bolt must go to the inside of
handle) included in the hardware pack, in the upper
hole on the handle mounting bracket. Secure with
one plastic wing nut, also included in the hardware
pack. Repeat process on other side.
• Attach the cables to the lower handle with the two
cable ties already on the lower handle, insert pegs
on cable ties into the holes on the lower handle.
Pull cable ties tight and cut off the extra. See Figure
6 .
Move Hairpin Clip
Attaching Grasscatcher
• Lift the rear discharge door and remove the rear
mulching baffle from the mower. See Figure 8.
Rear Mulching Baffle
Figure 8
8
NOTE: Make sure that the cables are routed to the
outside of the handle and out of the way when attaching
the grasscat cher.
• Place the hooks of the grasscatcher into the slots in
the handle bracket assemblies on both sides. See
Figure 9. Release the rear discharge door.
• To remove the grasscatcher, lift the rear discharge
door on the mower. Lift the grasscatcher up, out of
the slots in the handle bracket assemblies.
Reinstall the plastic rear mulching baffle and
release the rear discharge door.
Lift discharge door
Pull grass bag
out and away
Figure 9
NOTE: For instructions on how to bag the grass
clippings, please refer to page 11 of this manual.
WARNING: Never operate the mower
unless the hooks on the g rasscatch er are
seated in the slots o n the handle bracket
assemblies, and the rear discharge door
rest firmly against the top of the
grasscatcher.
SECTION 6: KNOW YOUR LAWN MOWER
Read thi s owne r’s manual and safety rules before
operating your lawn mower. Compare the illustrations
in Figure 10 with your lawn mower to familiarize
yourself with the location of various controls and
adjustments. Save this manual for future reference.
Drive Clutch Control
Upper Handle
Starter Rope
Lower Handle
Gas Cap
Grasscatcher Bag
The operation of any lawn mower can result in foreign
objects being thrown into the operator’s eyes thus
causing severe eye damage. Always wear safety
glasses while operating the mower, or while
performing any adjustments or repairs on it.
Blade Control Handle
Oil Fill Cap
Cutting Height
Adjustment Levers
Figure 10
9
Primer
Starter Rope
The starter rope is attached to the handle. Stand behind
the unit and pull the starter rope to start the unit.
The blade control handle is located on the upper handle
of the mower. The blade control handle must be
depressed in order to operate the unit. Release the
blade control handle to stop the engine and the blade.
Primer
The primer is used to pump gas into the carburetor. Use
it to assist in starting a cold engine, but do not use it
when rest arti ng a warm e ngin e aft er a s hort shutd own.
Refer to Figure 10.
Drive Clutch Contr ol
The drive clutch control lever is located on the upper
handle and is used to engage the drive. Squeeze the
lever against the upper handle to engage the drive;
release the drive clutch control to slow down or stop the
mower.
Blade Control Handle
WARNING: This control mechanism is a
safety device. Never attempt to bypas s its
operations or alter it in any way.
SECTION 7: OPERATING YOUR LAWN MOWER
Gas And Oil Fill-Up
Oil:
• Only use high quality detergent oil rated with API
service clas sificat ion SF, SG or SH. Use SAE30 oi l
only.
• Fill oil sump and check the oil level following steps
below.
a. Position the mower on level ground and
clean area around oil fill cap.
b. Remove oil fill cap and dipstick. Wipe
dipstick clean, insert it into oil fill hole and
tighten securely.
c. Remove dipstick and check oil level. If the oil
is not upto FULL mark on the dipstick, pour
recommended oil through the oil fill and
check the level again.
• Install oil fill cap and dipstick, tighten securely.
NOTE: Although multi-viscosity oils (5W30, 10W30,
etc.) improve starting in cold weather, these
multiviscosity oils will result in increased oil
o
consumption when used above 32
level more fre que ntly t o a voi d poss ibl e e ngi ne dam age
from running low on oil.
Gasoline
F. Check the oil
• Clean area around gas cap. Remove cap. Use a
funnel to pr event spi llage.
• Pour approximately 1.5 quarts of fresh, regular
grade, unleaded gasoline slowly into the fuel tank.
IMPORT ANT :
• Fill tank to 1/2” below the bottom of the filler neck to
allow space for fuel expansion. Wipe any fuel
spillage. Do not fill fuel tank completely.
Before Starting Mower
• Attach spark plug wire to spark plug. Make certain
the metal c ap on the end o f the spar k plug w ire
(inside the rubber boot) is fastened securely over
the metal tip on the spark plug.
• Check the drive clutch control for proper
adjustment. If the mower does not propel itself or
the drive wheels hesitate with the drive clutch
engaged, perform the drive clutch control
adjustment as instructed on page 18 of this manual.
Throttle Speed
Your engine is equipped with a constant speed throttle,
which is set at full throttle for best performance.
Never mix engine oil with gasoline.
WARNING: Never fill fuel tank i ndoors, or
when engine is running or hot. Do not
smoke when filling up the fuel tank.
10
Starting Engine
WARNING: Be sure no one other than the
operator is standing near the lawn mower
while starting engine or operating mower.
Never run engine indoors or in enclosed,
poorly ventilated areas. Engine exhaust
contains carbon monoxide, an odorless
and deadly gas. Keep hands, feet, hair
and loose clothing away from any moving
parts on engine and lawn mower. When
starting the unit for the first time, face the
mower agai nst a so lid ob ject s uch as w all,
fence, etc. Start the unit and if it shows
any signs of motion while the drive clutch
control is still engaged, shut the engine
off immediately.
• Make sure that the drive clutch control is adjusted
so the drive belt is as loose as possible.
• Move throttle control lever all the way back to the
“rabbit” position.
• Push primer three times, See Figure 10. Wait about
two seconds between each push. In cold weather
o
around 55
prime to restart a warm engine after a short
shutdown.
• Standing behind the mower, depress the blade
control handle and hold it against the upper handle.
• Grasp starter handle and pull rope out slowly until
engine reaches the start of compression cycle
(rope will pull slightly harder at this point). Let the
rope rewind slowly. Pull rope with a rapid,
continuous, full arm stroke. Keeping a firm grip on
the starter handle, let the rope rewind slowly.
F or below, prime five times. Do not
• For 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 yo u to slip and fa ll. New gras s, thick
grass or wet grass may require a narrower cut.
• For a healthy lawn, always cut off one-third or less
of the total length of the grass. Lawn should be
trimmed in fall as long as there is growth.
WARNING: If you strike a foreign object,
stop the engine. Remove spark plug wire
from spark plug, thoroughly inspect the
mower for any damage. 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.
Bagging Grass Clippings
You can use the grasscatcher bag to collect clippings
while you are operating the mower. Attach the
grasscatcher following instructions on page 9 of this
manual. The grass clippings will automatically collect in
the bag as you run the mower. Operate the mower till
the grass bag is full. Do NOT allow the bag to overfill
with grass clippings. Stop the engine completely by
releasing the control handle. Make sure that the unit
has come to a complete stop. To empty the grass bag
proceed as follows:
• Lift discharge door and pull grass bag up and away
from the mower to dispose of the grass clippings
See Figure 11.
Stopping Engine
• Release blade control handle to stop the engine
and the blade.
• Disconnect spark plug wire and move away from
spark plug to prevent accidental starting.
Using your Lawn Mower
• You can use your mower as a mulching mower or a
rear bagger.
• Do not operate the mower without the rear
mulching baffle or the grasscatcher bag properly
installed.
• Be sure that the lawn is clear of stones, sticks, wire,
or other objects which could damage lawn mower
or engine. Such objects could be accidently thrown
by the mower in any direction and cause serious
personal injury to the operator and others.
Figure 11
Adjusting Cutting Height
Refer to height adjustments section of this manual on
page 15 for instruction on how to adjust the cutting
height and the handle height.
• For best results in mowing, keep the cutting height
position high until it is determined which height is
best for your lawn.
11
SECTION 8: MAINTAINING YOUR LAWN MOWER
WARNING: Always stop the engine and
disconnect the spark plug wire before
performing any maintenance work or
adjustments on your lawn mower.
Cleaning Mower
The underside of the mower deck should be cleaned
after each use to prevent any build-up of grass
clippings, leaves, dirt, or other debris. If this debris is
allowed to accumulate, it will result in rust and
corrosion.
NOTE: We do not recommend the use of pressure
washers or garden hose to cl ean 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.
• Disconnect spark plug wire.
• Drain the gasoline from the lawn mower, or place a
piece of plastic under the gas cap.
• Tip the mower so that it rests on the housing. Keep
the side with the air cleaner 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 on the ground. If
you had put plastic under the gas cap, make sure to
remove it now.
WARNING: Never tip the mower more than
90 degrees in any directions and do not
leave the mower tipped for any length of
time. Oil can drain into the upper part of th e
engine causing a starting problem.
Engine Maintenance
• A list of key maintenance jobs required for good
performance by the mower is given below. Follow
the accompanying engine manual for detailed list
and instructions.
• Change engine oil after the first two operating
hours and every 25 operating hours thereafter.
Check the oil level before starting the engine every
time.
• Service foam filter in the air cleaner every 25 hours
of use and replace the paper filter component every
100 hours. You may have to service the air filter
more frequently if you are operating the mower
under extremely dusty conditions.
• Clean the engine periodically. Remove dirt and
debris with a cloth or brush.
• Clean the spark plug and reset the gap to .030” at
least once a season or every 50 hours of operation.
Spark plug replacement is recommended at the
start of each season. Refer to the engine manual
for correct spark plug type.
• Inspect muffler periodically, and replace if
necessary. Damaged mufflers or spark arresters
can create a fire hazard. Make sure to avoid muffler
and surrounding areas while the mower engine is
hot because temperature of these areas of the
engine may ex ceed 150
o
F.
Lubrication
Wheels
• Lubricate the wheels and bearings, if so equipped,
at least once a season with light oil or engine oil.
Also, if the wheels are removed for any reason,
lubricate the surface of the axle bolt and the inner
surface of the wheel with light oil.
Chute Deflector & Rear Discharge Door
• Lubricate the torsion spring and the pivot point on
each end of the chute deflector and the rear
discharge door using a light oil. This will prevent
rusting and ensure that the deflector, which is a
safety device, can always work properly.
Engine
• Follow the engine manual instructions and
recommended schedule for lubricating engine
components.
Transmission
• The transmission is pre-lubricated and sealed at
the factory and does not require lubrication on a
regular basis as part of maintenance. However, if
you disassemble the transmission for any reason,
refill with two ounces of Alvania grease (part # 737-
0168) as part of reassembly.
12
SECTION 9: SERVICE
Blade Care
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 heav y gloves or a
thick rag to grasp the cutting blade.
• Disconnect spark plug wire from spark plug.
• Turn mower on its side making sure that the air filter
and the carburetor are up.
To Remove Blade:
• Remove the bolt and bell washer which hold the
blade-pulley assembly to the engine crankshaft.
See Figure 12. Remove the assembly from the
crankshaft.
• Remove the two bolts and lock nuts from the blade
assembly.
• Remove the blade from the blade adapter and
pulley.
To Replace Blade:
• Before reinstalling the blade-pulley assembly to the
unit, lubricate the engine crankshaft and the inner
surface of the blade adapter with light oil or engine
oil.
• Also lubricate the bolt holes, bolt and the inner
surface of the nuts.
• Install the blade adapter on the pulley with the “star”
away from the pulley. See Figure 12.
Lock Nut
Blade
Adapter
Pulley
Assembly
Lock Nut
Blade
• Secure the blade to the assembly with two hex
bolts and lock nuts. Tighten the hex bolts to the
recommended torque. Refer to ‘Blade Mounting
Torque’ section on this page.
• Install the blade assembly on the crankshaft.
Secure with the hex bolt and bell washer (cupped
side of washer to blade) and tighten to the
recommended torque. Refer to ‘Blade Mounting
Torque’ section on this page.
IMPORT ANT :
engine is specially heat-treated. Do not substitute. To
order replacement bolt, refer to the parts list in the back
of this manual.
The bolt used to secure the blade to the
WARNING: To ensure safe operation of
your unit, all nuts and bolts must be
checked periodically for correct tightness.
To Sharpen Blade:
• The blade can be sharpened with a file or on a
grinding wheel. Do not attempt to sharpen the
blade while it is still on the mower.
• Follow the original angle of grind as a guide. Make
sure that each cutting edge receives an equal
amount of grinding to prevent an unbalanced blade.
NOTE: An unbalanced blade will cause excessive
vibration when rotating at high speeds, may cause
damage to the mower and could break, causing
personal injury. Test the blade by balancing it on a
round shaft screwdriver or a blade balancer.
• If the blade is not balanced, remove metal from the
heavy side until it balances evenly.
Blade Mounting T orque:
Blade adapter bolts: 120 in.lbs. minimum, 150
in.lbs.maximum Center bolt: 450 in.lbs. minimum, 600
in.lbs. maximum.
Hex Bolt
Bell
Washer
Figure 12
• Place the new blade on the blade adapter with the
side marked bottom (or with part number) facing
away from the adapter.
Hex Bolt
Hex Bolt
Replacing Drive Belt
• Remove the two shoulder screws from on top of the
deck which secures the front drive cover to the
mower deck. See Figure 13.
• Remove the front drive cover from the unit by lightly
pressing inward on the sides of the front drive
cover. This wil l releas e the tabs th at secure the
front drive cover to the height adjuster brackets.
• Remove the idler and related hardware from the
idler bracket using 7/16” wrench and socket. See
Figure 13.
• Remove the belt from the transmission pulley as
shown in Figure 14.
• Lift and stabilize the front of the deck.
13
• Loosen the center hex bolt and lower the blade and
engine pulley until there is adequate clearance to
move the belt past the belt keeper.
• Remove the belt from the engine pulley and around
the blade. See Figure 14.
Drive Belt
Pulley
Idler
Bracket
Shoulder
Screw
• Reassemble in reverse order with new belt (part #
754-0465). NOTE: Begin idler reassembly by
inserting bolt up through the idler bracket hole.
Adjust the drive c lutch follow ing instruct ions on
page 14.
NOTE: The wheels have
been moved forward in
this picture for clarity.
Do not remove the
wheels away from the
Bolt
mower housing while
doing the job.
Belt
Keeper
Lock Nut
Front Drive Cover
Right Front
Wheel
Center
Hex Bolt
Engine
Pulley
Remove belt
from around
pulley and blade
Left Front
Wheel
Spacer
Idler
Shoulder
Screw
Figure 13
Adjusting Drive Clutch Control
• The drive clutch adjustment wheel is located on the
drive clutch control handle housing and is used to
tighten or lo osen ten sion on th e drive ca ble.
Perform this adjustment if the following exists.
a. The mower does not propel itself with the
drive clutch engaged.
b. 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 15 .
To tighten
cable
Adjustment
Wheel
Figure 14
To loosen
cable
Figure 15
14
Adjusting Handle Height
Your mower is shipped with the handle in the higher
height position. To lower the handle height, proceed as
follows.
• Remove the start er ro pe fr om the rope g uide .
• 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 hairpi n clip s from the w eld pin s on t he
handle brackets. Refer to Figure 5. Press out on the
legs of the lower handle. Remove 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 16. Reassemble, placing the
bottom holes in the handle over the weld pins in the
handle mounting bracket.
Notch
An adjusting plate and thumb lever at each wheel
position provid es cut ting heig ht adju stme nt. Eac h
adjusting plate has nine height positions. Height of cut
will be changed when the thumb lever is moved from
one location to another.
• Simply depress the lever towards the wheel and
move the lever assembly to desired position. See
Figure 17.
• For rough or uneven lawns, move the height
adjustment handles to higher cutting height
position.
Height Adjustment
Lever
Lower
Handle
Figure 16
• Reassemble the upper handle to the lower handle.
• Place the ha irpin clip s in the i nner hol es of the w eld
pins and attach the starter rope as instructed in the
Assembly section.
Adjusting Cutting Height
IMPORT ANT :
relative position. For rough or uneven lawns, move the
height adjustment lever to a higher position. This will
help stop scalping of the grass.
All wheels must be placed in the same
Figure 17
Adjusting Carburetor
If the engine is running rough, minor adjustments to the
carburetor may be required to compensate for
differences in fuel, temperature, altitude and load.
NOTE: A dirty a ir cleaner may cause an e ngine to run
rough.
Make sure that the air cleaner is clean and attached to
the carburetor before deciding to adjust the carburetor.
To adjust the carburetor, please follow the
recommendations and instructions on carburetor
adjustment in the engine manual.
WARNING: If any adjustments are made to the
engine (e.g. carburetor) while the engine is running,
keep clear of all moving p ar ts. Be c are ful of hea te d
surfaces like the muffler.
15
SECTION 10: OFF-SEASON STORAGE
Prepare your lawn mower for storage at the end of the
season or if the unit will not be used for 30 days or
more. Store the mower in a clean, dry area.
Mower
• Clean underside of the mower following
instructions in the Maintaing your lawn mower
section of this ma nual.
• Lubricate mower as instructed on page 12 of this
manual.
• You can fold your mower’s handle for convenient
storage: Remove the starter rope from the rope
guide; loosen the two hand knobs on the sides of
the handle, and let the upper handle fold down to
the rear. Move the hairpin clips to the outer hole in
the weld pins on the handle mounting brackets.
Spread the sides of the lower handle, and push it
forward and down.
• Inspect and replace/sharpen blade, if required.
Refer to the Service section of this manual for blade
care instructions.
Engine
• Follow recommendations in the accompanying
engine manual for off-season storage of the
engine.
• Change oil if it has not been changed in the last
three months. For instructions on how to change oil,
refer to the engine manual.
• Clean engine and remove any grass clippings, dirt,
and debris from the cooling fins, air intake screen,
levers, linkage and the exterior of the engine.
Other
• Do not store gasoline from one season to another.
• Replace your gasoline can if it starts to rust. Rust
and/or dirt in the gasoline will cause problems.
Store unit in a clean, dry area. Do not store next to
corrosive materials, such as fertilizer.
NOTE: If storing in an unventilated or metal storage
shed, be certain to ru stproof the e quipment by coat ing
with a light oil or silicone.
16
SECTION 11: TROUBLE-SHOOTING GUIDE
PROBLEM POSSIBLE CA USE CORRECTIVE ACTIO N
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
Engine runs erratic 1. Spark plug wire loose
2. Blocked fuel line or stale fuel
3. Vent in gas cap plugged
4. Water or dirt in fuel system
5. Dirty air cleaner
Engine over heat s 1. Engine oil le vel lo w
2. Air flow restricted
Occasional skip
(hesitates) at high
speed
Idles poorly 1. Spark plug fouled, faulty, or gap too wide
Excessive vibration 1. Cutting blade loose or unbalanced
Mower will not
mulch grass
Uneven cut 1. Wheels not in same height position
1. Spark plug gap too close 1. Adjust gap to.030 inches.
2. Dirty air cleaner
2. Bent cutting blade
3. Bent engine crankshaft
1. Engine speed too low
2. Wet grass
3. Excessively high grass
4. Dull blade
2. Dull blade
1. Engage blade control handle
2. Connect wire to spark plug
3. Fill up tank with fresh gasoline
4. Clean fuel line
5. Clean, adjust gap, or replace
6. Wait a few minutes to restart, Do not
prime.
1. Connect and tighten spark plug wire.
2. Clean fuel line, fill tank with clean,
fresh gasoline.
3. Clear vent.
4. Drain fuel tank. Refill with fresh fuel.
5. Clean air cleaner. Refer to engine
manual.
1. Fill crankcase with proper oil.
2. Clean lawn mower engine.
1. Reset gap to.030 inches or replace
spark plug.
2. Clean air cleaner.
1. Tighten blade and adapter, balance
blade.
2. Replace blade.
3. Contact your nearest service center
1. Wait until grass is dry to cut.
2. Mow once at a high cutting height,
then mow again at desired height.
3. Sharpen or replace blade.
1. Reposition all wheels at same height.
2. Sharpen or replace blade.
17
SECTION 12: PARTS LIST FOR MODEL 559K
2
5
7
1
3
4
6
23
67
66
8
65
68
15
17
69
13
60
62
72
56
63
10
18
70
77
16
54
12
55
79
53
20
53
17
19
27
52
18
26
71
74
21
38
39
40
75
25
29
76
28
36
30
34
33
31
32
24
35
78
37
11
9
14
45
80
73
61
58
59
64
18
42
43
41
44
19
MODEL 559K
Ref. No Part No. Description
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
731-1057 Upper Drive Cover
731-0620 Drive Lever
731-1058 Lower Drive Cover
731-1059 Mounting Cap
710-1667A Screw # 10-16 x .625
746-0960 Drive Cable
747-0824 Control Lever
749-0439B Upper Handle (Incl. R ef. No. 9)
720-0294 Foam Grip, 9”
712-0324 Hex Lock Nut, 1/ 4-20
746-0883 Throttle Housing
710-1270 Oval C-Sunk Screw 1/4 -20 x 1.3 1
720-0279 Handle Knob
720-0276 Handle Knob
710-1205 Eye Bolt
746-0550 Control Cable, 39”
710-1174 Carriage Bolt 5/16-18 x 2.0
682-3058
682-3059
726-0240 Cable Tie
714-0104 Cotter Pin
710-1007 Self-tapping Screw
664-0085 Grassbag w/ logo
710-1650 Shoulder Screw # 12 -24
631-0075 Engine Spacer
751B213146 Clamp Casing
710-1237 Hex Screw TT #10-32 x .625
782-0080 21” Rear Discharge Deck
782-5004 RH Rear Baffle
710-1017 Screw AB: 1/4-14: .625
782-5003 LH Rear Baffle
710-0216 Hex Screw 3/8-16 x .75
736-0331 Bell Washer .39 x 1.13 x .062
712-0798 Hex Nut 3/8-16
731-1937 Transmission Cover (Ye llow)
782-5002 Front Baffle
754-0465 V-Belt, 3/8 x 35.68”
712-0324 Hex Nut 1/4-20
RH Bracket Ass’y
(Incl. Ref. 54, 56, 59 , 60 & 62)
LH Bracket Ass’y (Not Shown)
Ref. No Part No. Description
39.
40.
41.
42.
43.
44.
45.
52.
53.
54.
55.
56.
57.
58.
59.
60.
61.
62.
63.
64.
65.
66.
67.
68.
69.
70.
71.
72.
73.
74.
75.
76.
77.
78.
79.
80.
756-1146 Drive Pulley
748-0411 Blade Adapter
742-0741 21” Mulching Blade
736-0452 Flat Washer .516 x 1.5 x .134
710-0606 Hex Screw 1/4-20 x 1.50
710-1257 Hex Screw 3/8-24 x 2.50
749-0907A Lower Handle
712-0798 Hex Nut 3/8-16
736-0356 Bell Washer .3 9 I.D. x 1.38 O.D.
712-3005 Hex Flange Lock Nut 3/8 -16
710-0896 Hex Scr. w/Washer 1/4-14 x .625
682-3056
682-3057
736-0270 Bell Washer .265 x .75 x .062
710-0599 Hex Screw TT 1/4-20 x .500
17488A
17489A
732-0866 Height Adj. Lever
720-0312 Foam Grip
738-0507B Shoulder Scr .500 Dia. x . 434
736-0105 Washer .401 x .870 x .063
734-1860 Wheel, 14 x 2 Yellow (Link Trd.)
736-0182 Spring Washer .50 I.D. x 1.0 O.D.
736-0456 Flat Washer . 510 x 1.3 73 x .04
738-0481 Shoulder Screw
732-0700 Wire
731-1236 Rear Trailing Shield
747-0996 Pivot Rod
732-0809 Torsion Spring
782-7599A Rear Discharge Door
747-0995A Grasscatch er Frame
712-0271 Hex Nut
711-1293 Screw
782-5007A Plastic Mulching Baffle
750-0434 Spacer .375 x .50 x 1.02” Lg.
738-1002 Shoulder Screw 1/4-14
710-0703 Carriage Bolt 1/4-20
712-0397 Wing Nut
RH Handle Bracket
LH Handle Bracket ( not show n)
RH Pivot Bar
LH Pivot Bar (not sh own)
20
MODEL 559K
1
2
3
55
39
40
51
47
53
51
52
44
40
43
41
46
42
39
37
33
19
49
32
36
20
34
31
30
8
10
14
5
7
16
25
9
12
23
4
6
15
22
11
17
29
13
56
30
48
42
41
38
36
35
33
32
31
19
20
57
21
45
43
47
52
53
46
54
50
24
26
28
27
28
21
MODEL 559K
Ref. No Part No. Description
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
712-3025 Hex Jam Nut 5/16-24
736-0425 Bell Washer .325 x .9 30 x .045
756-1042 Pulley, 3.82 x .313 x .68
736-0425 Bell Washer .325 x .9 30 x .045
712-0896 Lock Nut 1/4-28
736-0406 Flat Washer .442 x 1 .38 x .060
782-7598 Belt Keeper
741-0124 Ball Bearing
721-0457 Oil Seal
750-1050 Flange Spacer
682-0028 Idler Bracket Assembly
741-0682A Bearing Sleeve
732-0849A Flat Washer .504 x .700 x.0 30
710-0299 Hex Cap Screw 1/4-28 x 1.00
736-0570 Flat Washer .865 x 1 .145 x .03 0
741-0699 Needle Bearing .438 x .62 5 x .500
721-0325 Plug 1/4 x .437
618-0300A Upper Housing
721-0329 Oil Seal .500 x .68 7 x .094
741-0673 Flange Bearing
611-0105 Output Shaft
736-0520 Flat Washer .504 x .7 00 x .030
717-1492 Pinion Shaft 10T
736-0314 Thrust Washer .375 x .70 x .030
736-0569 Thrust Washer .388 x .625 x .062
618-0299A Lower Housing
741-0672 Flange Bearing .378 x .531 x . 370
710-1276 Hex Screw w/Washer 1/4-20 x .750
618-0298A Transmission As sembly
(Includes Ref. # 1t o Ref. #30)
Ref. No Part No. Description
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.
56 750-1165 Sleeve Spacer .52 I.D. x 10.1” Lg .
57 750-1166 Sleeve Spacer .52 I.D. x 2.1” Lg.
732-0708 Bearing Retainer
741-0604 Bearing Sleeve .50 I.D .
748-0355 Bearing Support
736-0447 Wave Washer 1.5 x 1.0 x .0 29
782-0512B RH Height Adj. Plate
782-0511A LH Height Adj. Plate
682-0509 Pivot Plate Assembly
732-0706 RH Front Lever
732-0707 LH Front Lever
720-0190 Knob
710-0216 Hex Cap Screw 3/8-16 x .7 5
736-0474 Washer DD 1.5” O.D.
716-0102 Snap Ring 1.0 dia.
782-7551 Wheel Dust Cap
717-1534 Gear 14T RH FWD
717-1533 Gear 14T LH FWD
734-1866
734-1870
731-1426 Hubcap: Yellow
682-0512A RH Height Adj. Co mplete
682-0511A LH Height Adj. Complete
682-0030 Cable Idler Bracket
715-0221 Dowel Pin
736-3013 Flat Washer 1/2 x 1.0 0 x .063
714-0101 Cotter Pin .08 x 1.42
738-1002 Screw
754-0465 Belt
Wheel, 8x2 Yellow (Link Trd.)
Wheel, 8x2 Yellow (Bar T rd.)
22
MANUFACTURER’S LIMITED WARRANTY FOR:
The limited warranty set forth below is given by MTD
PRODUCTS INC (“MTD”) with respect to new merchandise purchased and used in the United States, its possessions and territories.
MTD warrants this product against defects in material and
workmanship for a period of two (2) years commencing on
the date of original purc ha se an d w i ll, at its option, repair or
replace, free of charge, any part found to be defective in
material or workmanship. This limited warranty shal l only
apply if this product has been operated and maintained in
accordance with the Operator’s Manual furnished with the
product, a nd has not bee n subj ect to misuse, abuse, commercial use, neglect, accident, improper maintenance,
alteration, vandalism, theft, fire, water or damage because
of other peril or natur al di sa ste r. Damage resulting from the
installation or use of any accessory or attachment not
approved by MTD Products Inc. for use with the product(s)
covered by this manual will void your warranty as to any
resulting damages.
Normal wear parts or components thereof are subject to
separate terms as follows: All normal wear part 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 par t failures will be covered
ONLY IF caused by defects in material or workmanship of
OTHER component parts. Normal wear parts and components include, but are not limited to, belts, blades, blade
adapters, grass bags, rider deck wheels, seats, snow
thrower skid shoes, shave plates and tires. Batteries are
covered by a 90-day limited replacement warranty.
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, please check for a listing in the Yellow
Pages or contact the Customer Service Department of
MTD PRODUCTS INC by calling 1-800-800-7310 or writing to P.O. Box 368022, Cleveland, Ohio 44136-9722.
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. Please
refer to the applicable manufacturer’s warranty on
these items.
b.Log splitter pumps, valves and cylinders have a sepa-
rate one year warr an ty.
c. Routine maintenance items such as lubricants, filters,
blade shar pening and tune-ups, or adjustments such
as brake adjustments, clutch adjustments or deck
adjustments; and nor mal deterioration of the exterior
finish due to use or exposure.
d. MTD does not extend any warranty for products sold
or exported outside of the United States of America,
its possessions and territories, except those sold
through MTD’s authorized channels of export distribu-
tion.
No implied warranty, including any implied warranty of
merchantability or fitness for a particular purpose,
applies after the applicable period of express written
warranty above as to the par ts as ident ified. No o ther
express war ranty or guaranty, whether wri tten or or al,
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. (Some states do not
allow limitations on how long an implied warranty lasts, so
the above limitation may not apply to you.)
The provisions as set f orth in this W a rranty pr o vide the
sole and exclusive remedy arising from the sales. MTD
shall not be liable for incidental or consequential loss
or damages including, without limitation, expenses
incurred for substitute or replacement lawn care services, for transportation or for related expenses, or for
rental expenses to temporarily replace a warranted
product. (Some states do not allow the exclusion or limita-
tion of incidental or consequential damages, so the above
exclusion or limitation may not apply to you.)
In no event shall recover y of any kind be greater than the
amount of the purchase price o f the pro duct sold . Alter ati on
of the 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 use or misuse or inability to use
the product.
This limited warranty shall not extend to anyone other than
the original purchaser, original lessee or 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.
23
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