Yard-Man 247.37979 User Manual

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Operator’s Manual

21” Self-Propelled

Mower

Model No.

247.379790

Factory No.

12A-979L402

IMPORTANT: READ SAFETY RULES AND INSTRUCTIONS CAREFULLY

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.

MTD PRODUCTS INC. P.O. BOX 368022 CLEVELAND, OHIO 44136-9722

PRINTED IN U.S.A.

This unit is equipped with an internal combustion engine and should not be used on or near any unimproved forest-

FORM NO. 770-10214

(12/98)

SECTION 1: FINDING YOUR MODEL NUMBER

This Operator’s Manual is an important part of your new walk behind. It will help you assemble, prepare and maintain your walk behind. Please read and understand what it says. Before you start to prepare your walk behind for its first use, please locate the model plate and copy the information from it in this Operator’s Manual. The information on the model plate is very important if you need help from your dealer or the MTD customer support department.

• Every walk behind has a model plate. You can locate it by standing behind the unit in the operating position and looking down at the rear of the deck.

• The model plate will look like Figure 1.

This is where your model number will be.

XXX-X-XXX-X-XXX XXXXXXXXXXX

This is where your serial number will be.

Copy the model number here:

MTD PRODUCTS INC

CLEVELAND, OHIO 44136

Copy the serial number here:

Figure 1

SECTION 2: CALLING CUSTOMER SUPPORT

• LOCATE YOUR MODEL NUMBER AND SERIAL NUMBER — Record this information in the space provided. To find your unit’s specific model number and serial number, see SECTION 1: FINDING YOUR MODEL NUMBER.

• If you are having difficulty assembling this product or if you have any questions regarding the controls, operation or maintenance of this unit, please call the Customer Support Department.

• Customer Support can be reached by dialing: 1- (330) 220-4MTD

(4683)

1- (800)-800-7310

• Please have your model number and serial number ready when you call.

• Although both numbers are important, you will be asked to enter only your serial number before your call can be processed.

SECTION 3: SLOPE GAUGE

OR A FENCE POST

A CORNER OF A BUILDING

A POWER POLE

SIGHT AND HOLD THIS LEVEL WITH A VERTICAL TREE

15°

WARNING

SE THIS PAGE AS A GUIDE TO DETERMINE SLOPES WHERE YOU MAY NOT OPERATE SAFELY.

o 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

ould overturn and cause serious injury. If operating a walk-behind mower on such a slope, it is extremely difficult to maintainyour footing and you could slip, resulting in serious injury.

perate 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.

SECTION 4: IMPORTANT SAFE OPERATION PRACTICES

WARNING: THIS SYMBOL POINTS OUT IMPORTANT SAFETY INSTRUCTIONS WHICH, IF NOT

FOLLOWED, COULD ENDANGER THE PERSONAL SAFETY AND/OR PROPERTY OF YOURSELF AND OTHERS. READ AND FOLLOW ALL INSTRUCTIONS IN THIS MANUAL BEFORE ATTEMPTING TO OPERATE YOUR LAWN MOWER. FAILURE TO COMPLY WITH THESE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY. WHEN YOU SEE THIS SYMBOL, HEED ITS WARNING.

DANGER: Your lawn mower 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 lawn mower is capable of amputating hands and feet and throwing objects. Failure to observe the following safety instructions could result in serious injury or death.

1. GENERAL OPERATION

• Read this owner’s guide 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 accidentally thrown by the mower in any direction and cause serious personal injury to the operator or any others allowed in the area.

• 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 any others allowed in the area. Plan 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.

• 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.

• 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. 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.

• 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 mower toward you while you are walking. If you must back the 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 well balanced with sure footing.

• 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.

• 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 IMMEDIATLEY 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. Telephone 1-800-800-7310 for the name of your nearest dealer.

2. SLOPE OPERATION

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.

• Watch for holes, ruts, hidden objects, or bumps. Tall grass can hide obstacles.

• 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 seconds.

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.

3. 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. 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.

4. 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 cap 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.

• 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.

• 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.

• Do not adjust the throttle with the engine running.

WARNING: The engine exhaust from this product contains chemicals known to the

state of California to cause cancer, birth defects or other reproductive harm

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.

Figure 2 Safety Labels Found On Lawn Mower

U A

RY,

LEC

ISI

SECTION 5: UNPACKING INSTRUCTIONS

REMOVE UNIT FROM CARTON

(See Figure 3.)

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

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

• Cut along dotted lines and lay carton down flat.

• Remove packing material.

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

REMOVE MANUAL & LOOSE PARTS

PUSH

Figure 3

DISCONNECT SPARK PLUG WIRE

Before setting up your lawn mower, disconnect the spark plug wire from the spark plug, and ground it against the engine by attaching rubber boot to a bolt or metal clip to the grounding post on the engine. See Figure 4.

Spark Plug

Wire

Figure 4

Spark Plug

SECTION 6: SET-UP INSTRUCTIONS

ITEMS REQUIRED FOR ASSEMBLY

• Pair of Pliers (Not necessary, but helpful)

• Motor Oil (Included)

• Fresh Gasoline

IMPORTANT: This unit is shipped WITHOUT GASOLINE or OIL in the engine. Be certain to service engine

with gasoline and oil as instructed in the separate engine manual before operating your mower.

NOTE: Reference to right or left hand side of the mower is observed from the operating position. SET UP YOUR LAWN MOWER

Follow steps 1 through 9 to set up your lawn mower.

Step 1. Remove grass bag from unit and set it out

of the way.

Grass Bag

Step 3. Tighten wing nuts.

HERE

Step 2. Lift upper handle. Align it with lower

handle.

Upper Handle

Step 4. Raise complete handle assembly until it

clicks into place. Make sure not to kink the control cables.

Handle Assembly

Step 5. Pinch lower handle against mounting

bracket with pliers.

Step 7. Attach control cables to handle with pull

ties found on the handle.

Step 6. Move hairpin clip from outer to inner hole

on left and right handle mounting brackets.

Inner Hole

Hairpin Clip

Pinch Here

HERE

Step 8. Squeeze the blade control handle against the upper handle and pull out the starter rope slowly. Step 9. Thread the starter rope into the rope guide.

SQUEEZE

Look Here

Blade Control Handle

Upper Handle

Starter Rope

Rope Guide

SECTION 7: CONTROLS

Blade Control Handle

Throttle Control

Recoil Starter

Cutting Height

Adjustment Lever

Drive

Clutch

Control

Shift Lever

Figure 5

BLADE CONTROL HANDLE

The blade control handle is located on the upper handle of the mower. See Figure 5. The blade control handle must be depressed in order to start and operate the unit. Release the blade control handle to stop the engine and blade.

WARNING: The blade control handle is a safety device. Never attempt to bypass its operations. The

blade will be rotating whenever the engine is running.

THROTTLE CONTROL

The throttle is located on the engine. It is used to regulate the engine speed.

WARNING: The throttle control cannot be used to stop the engine. Do not adjust the throttle

control with the engine running.

RECOIL STARTER

The recoil starter handle is attached to the lower handle. See Figure 5. Stand behind the unit in the operating position to start the unit.

DRIVE CLUTCH CONTROL

Squeeze the drive clutch control to engage the drive system. Release the clutch control to disengage 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 clutch control housing on the upper handle. See Figure 5. This lever is used to select the forward speed of the mower. When changing speed selection, release the drive clutch control.

NOTE: Move the shift lever only when the engine is running. Changing the shift lever setting with the engine off

can cause damage to the mower.

CUTTING HEIGHT ADJUSTMENT LEVER Note:

The cutting height adjustment lever is located above the left rear wheel. To adjust the cutting height, pull the lever out and away from the mower and then move it forward or backward to select a new cutting height. See Figure 6.

Your mower is shipped with the cutting height in the lowest position. Adjust the cutting height as follows.

LOWER

HIGHER

Cutting Height Adjustment Lever

Figure 6

NOTE: For rough or uneven lawns, move the height adjustment lever to a higher position. This will help stop

scalping.

ENGINE CONTROLS

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

SECTION 8: OPERATION

WARNING: Keep hands and feet away from the chute area on the cutting deck. See Figure 2. The

operation of any lawn mower can result in foreign objects being thrown into the eyes, which can result in severe eye damage. Always wear safety glasses or eye shields.

NOTE: For best results raise the cutting position until it is determined which height is best for your lawn. See

CUTTING HEIGHT ADJUSTMENT LEVER in the CONTROLS section.

GAS AND OIL FILL-UP

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

WARNING: Never fill fuel tank indoors with engine running or until the engine has been allowed to

cool for at least two minutes after running.

EACH TIME YOU START YOUR MOWER

ALL UNITS:

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

• Check for proper drive clutch operation using the NEUTRAL ADJUSTMENT TEST.

NEUTRAL ADJUSTMENT TEST

To perform the NEUTRAL ADJUSTMENT TEST answer the following questions.

• With the drive clutch control released, push mower forward and pull it backward. Does it move freely?

• Squeeze the drive clutch control and pull the mower backward. Do the rear wheels lock (not turn)?

• Is the drive clutch control cable free of kinks or sharp bends?

If you answered “yes” to all three questions, your mower passed the test and you can start your mower. If you answered “no” to any of the three questions, you will have to adjust the drive clutch control following instructions in the DRIVE CLUTCH CONTROL ADJUSTMENT section.

TO START ENGINE AND ENGAGE BLADE

• Move the throttle control on the engine to the fast (rabbit) position.

• Prime engine as instructed in the separate engine manual.

• Stand behind the unit, squeeze the blade control handle and hold it against the upper handle.

NOTE: If any problems are encountered, refer to the TROUBLE SHOOTING Section of this manual. TO STOP ENGINE AND BLADE

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

WARNING: The blade continues to rotate for a few seconds after the engine is shut off.

USING YOUR ROTARY MOWER

Be sure that the lawn is clear of stones, sticks, wire, or other objects which could damage the lawn mower or the engine. Such objects could be accidently thrown by the mower in any direction and cause serious personal injury to the operator and others. For best results, do not cut wet grass because it tends to stick to the underside of the mower, preventing proper discharge of grass clippings, and could cause you to slip and fall. New grass, thick grass or wet grass may require a narrower cut. For a healthier lawn, never cut off more than one-third of the total length of the grass. Your lawn should be cut in the fall as long as there is growth. This mower is designed to be operated at full throttle to give you the best cut and do the most effective job of mowing or mulching.

WARNING: If you strike a foreign object, stop the engine. Remove wire from the spark plug,

thoroughly inspect the mower for any damage, and repair the damage before restarting and operating the mower. Extensive vibration of the mower during operation is an indication of damage. The unit should be promptly inspected and repaired.

BAGGING GRASS CLIPPINGS

This mower can bag grass clippings. Follow steps 1 through 3 to ready the mower for bagging.

Step 1. Remove wing nuts holding mulching baffle

or side discharge chute in place. Then remove plug or discharge chute.

Step 3. Lift chute door and slide bag onto adapter.

Step 2. Replace with bagging adapter. Attach

using wing nuts. Be sure that inner lip of attachment goes under the edge of the deck.

Chute Door

NOTE: The chute door has been

designed to move the starter rope out of the way of the bag when the chute door is opened.

Bagging adaptor Mulching baffle Side-discharge chute

EMPTYING YOUR GRASS BAG

Holding the grass bag by both the rear handle and the lower handle, lift it straight up. The chute door will move the rope out of the way of the bag. Remove the bag from the bagging adaptor on the mower. While holding the lower handle lift up the rear section of the grass bag as shown in Figure 7. The bag will open and the grass clippings will fall out. When replacing your grass bag be sure the top of the bag rests on the wire support between

the handles.

Grass Clippings

Figure 7

SIDE-DISCHARGE GRASS CLIPPINGS

This mower can also side-discharge grass clippings. Follow steps 1 and 2 to ready this mower for side-discharge operation.

Step 1. Remove mulching baffle or grass bag

adapter.

Step 2. Attach discharge chute with wing nuts.

SECTION 9: ADJUSTMENTS

WARNING: Do not at any time make any adjustment to lawn mower without first stopping engine and

disconnecting spark plug wire.

HANDLE HEIGHT ADJUSTMENT

Lower Handle

Figure 8

Your mower is shipped with the handle in the higher height position. To lower the height proceed as follows:

• Remove the starter rope from the rope guide.

• Remove the upper handle by removing the hand knobs and carriage bolts. Lay the upper handle out of the way, being careful not to bend or kink the cables.

• Remove the hairpin clips from the weld pins on the handle brackets. Press out on the legs of the lower handle. Remove lower handle from the mower.

• Turn lower handle around so the notch on the bottom of the lower handle is facing forward. See Figure 8. Reassemble, placing the bottom holes in the handle over the weld pins in the handle mounting bracket.

• Reassemble the upper handle to the lower handle.

• Place the hairpin clips in the inner holes in the weld pins and attach the starter rope as instructed in the SetUp Instructions.

Notch

DRIVE CLUTCH CONTROL ADJUSTMENT

The drive clutch control adjustment wheel is located in the drive clutch control handle housing and is used to tighten or loosen the drive belt. You will have to adjust the drive clutch control if any of the following happens:

• The mower does not propel itself with the drive clutch engaged.

• The mower’s drive wheels hesitate with the drive clutch engaged.

To resolve the above problems, rotate the adjustment wheel with your fingers. Clockwise to tighten the cable and counter-clockwise to loosen the cable. See Figure 9.

Adjustment Wheel

Bottom View

Figure 9

Note: For some people the drive clutch handle may not be in a comfortable position. You can adjust the handle

out by tightening the adjustment wheel.

SHIFT LEVER CABLE ADJUSTMENT

Periodic adjustment of the six speed shift cable may be required due to normal wear on the cable. Adjustment is needed if all six speeds do not work. The adjustable cable bracket is located on the left side of the mower, beside the engine. Follow steps 1 through 7

to adjust the shift lever.

Bottom View

Speed Control

Lever

Step 1. Start engine. Step 2. Place speed control in the sixth speed

position. Step 3. Stop engine. Step 4. Disconnect spark plug wire and ground it.

Adjustable Cable Bracket

Hex Nut (A)

PUSH

Step 5. Loosen hex nut (A) which secures the

adjustable cable bracket. Step 6. Push back on the adjustable cable bracket. Step 7. Tighten hex nut (A).

SECTION 10: MAINTENANCE

WARNING: Be sure to disconnect and ground the spark plug wire before performing any repairs or

maintenance.

NOTE: When tipping the unit, empty the fuel tank and keep the engine spark plug side up. Never tip the mower

more than 90 degrees and do not leave the mower tipped for any length of time. Oil can drain into the upper part of the engine causing a starting problem.

ENGINE

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

• Maintain engine oil as instructed in the separate engine manual packed with your unit. Read and follow instructions carefully.

• Service air cleaner every 25 hours under normal conditions. Clean every few hours under extremely dusty conditions. Poor engine performance and flooding usually indicate that the air cleaner should be serviced. To service the air cleaner, refer to the separate engine manual packed with your unit.

• The spark plug should be cleaned and the gap reset once a season. Spark plug replacement is recommended at the start of each mowing season; check engine manual for correct plug type and gap specifications.

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

DECK

The underside of the mower deck should be cleaned after each use to prevent a buildup of grass clippings, leaves, dirt or other matter. If this debris is allowed to accumulate, it will invite rust and corrosion, and may prevent proper mulching, discharge or bagging. The deck may be cleaned by tilting the mower and scraping clean with a suitable tool (make certain the spark plug wire is disconnected).

CUTTING BLADE REMOVAL, REPLACEMENT AND SHARPENING

Blade

Adapter

Blade Bell Support

Hex Bolt

Figure 10

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

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

• Remove the blade and the adapter from the crankshaft.

WARNING: Periodically inspect the blade adapter for cracks, especially if you strike a foreign object.

Replace when necessary.

When sharpening the blade, follow the original angle of grind as a guide. It is extremely important that each cutting edge receives an equal amount of grinding to prevent an unbalanced blade. An unbalanced blade will cause excessive vibration when rotating at high speeds. It may cause damage to the mower, and could break causing personal injury. The blade can be tested by balancing it on a round shaft screwdriver. Remove metal from the heavy side until it balances evenly. It is recommended that the blade always be removed from the adapter when testing for balance. Before reinstalling the blade and the blade adapter to the unit, lubricate the engine crankshaft and the inner surface of the blade adapter with light oil.

• Be sure to install the blade with the side of the blade marked “Bottom” (or with part number) facing the ground when the mower is in the operating position.

• Slide the blade adapter on to the engine crankshaft.

• Place the blade on the adapter. Be certain the blade is aligned with and seated on the blade adapter flanges.

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

• Replace hex bolt.

• Tighten hex bolt to torque: 450 in. lbs. min., 600 in. lbs. max.

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

DRIVE BELT REMOVAL AND REPLACEMENT

Step 1. Disconnect the spark plug wire and ground it

against the engine.

Step 2. Drain the fuel tank or place a piece of plastic

beneath the cap to prevent gasoline leakage. Step 3. Place shift lever in the first position. Step 4. Tip the mower on its side. Block securely. Step 5. Remove the center bolt which secures the

blade to the crankshaft. Remove the blade, and

the blade adapter, wave washer, and spacer.

Refer to Cutting Blade Removal, Replacement

and Sharpening in the Maintenance Section. Step 6. Move rear height adjuster to the sixth position.

Step 7. Using a 3/8” socket, remove three hex screws

holding the baffle to the deck.

Hex Screw

Step 9. Remove the hex bolt holding the transmission

to the mower housing.

Rear Height Adjustment Lever

Hex Bolt

Baffle

Step 10. Tilt the transmission forward and loosen the

idler pulley bolt and lock nut 1/2 turn using two 7/16” wrenches.

Step 11. Using a pair of pliers, pull back and rotate belt

keeper bracket from the slot on the idler pulley.

Step 12. Slide the belt out from between the belt

keeper bracket and the idler pulley.

Hex Screw

Step 8. Pivot baffle towards the rear of the mower.

Baffle

Transmission Pulley

Belt

Belt Keeper Bracket

Idler Pulley Bracket

Idler Pulley

Bolt and Locknut

Transmission

Step 13. Squeeze the belt together and push it

Six-Speed

forward. Press the control arm inward towards the

deck and remove the six speed cable from the

slot.

Cable Slot

Belt

Control Arm

Step 14. Pivot the control arm down away from the

pulley and belt.

Six-Speed Cable Slot

Step 16. Place the new belt over the transmission

pulley. Start the belt in the pulley groove and rotate the pulley until the belt is seated in the transmission pulley.

Step 17. Place the belt between the idler pulley and the

belt keeper bracket.

Step 18. Using pliers, rotate the belt keeper bracket so

that it snaps into slot on the idler bracket.

Step 19. Tighten the idler pulley bolt and lock nut half a

turn using two 7/16” wrenches.

Transmission Pulley

Belt

Belt Keeper Bracket

Idler Pulley Bracket

Idler Pulley

Bolt and Locknut

Transmission

Control

Arm

Step 15. Lift off the lower pulley assembly and remove

the old belt from around the crankshaft.

Lower Pulley Half

Crankshaft

Belt

Step 20. Place the belt between the two pulley halves

on the crankshaft. Make sure to route the belt inside the belt guard pin.

Upper Pulley Half

Tab

Belt

Guard

Belt

Lower Pulley Half

IMPORTANT: When replacing the belt, do not disassemble the lower pulley assembly.

Step 21. Pinch both sides of the belt together so that

the belt is not in the pulley groove, and the lower

pulley can be pushed towards the engine.

Lower Pulley Half

Belt

Belt Guard Pin

Step 24. Reinstall the bolt securing transmission to rear mower housing. Step 25. 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. Step 26. Lightly lubricate the inside of the blade adapter and reinstall the spacer, wave washer, blade adapter

assembly and the blade in the correct order. Step 27. Tighten the hex bolt to secure the blade. Follow recommended torque: 450-600 in. lbs.

Step 22. Pivot the control arm back to its original

position and reinstall the six-speed cable into the slot.

Step 23. Check and make sure the belt is routed inside

the pulley halves and the belt guard pin.

SECTION 11: LUBRICATION

WARNING: Always stop engine and disconnect spark plug wire before cleaning, lubricating or doing

any kind of service work on the lawn mower.

Blade Control Handle

LUBRICATE

Engine

SEE ENGINE MANUAL

Figure 11

Blade Control: Lubricate the pivot points on the blade control handle and the brake cable at least once a

season with light oil. See Figure 11. The blade control must operate freely in both directions.

Wheels: Lubricate the wheels 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. See Figure 11.

Engine: Follow engine manual for lubrication instructions.

SECTION 12: OFF-SEASON STORAGE

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

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

• Refer to engine manual for correct engine storage instructions.

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

• Store mower in a dry, clean area. Do not store next to corrosive materials, such as fertilizer.

NOTE: When storing any type of power equipment in a poorly ventilated or metal storage shed, care should be

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

SECTION 13: TROUBLE SHOOTING GUIDE

Trouble Possible Cause(s) Corrective Action

Engine fails to start Blade control handle disengaged.

Spark plug wire disconnected. Throttle control lever not in correct starting position. Fuel tank empty, or stale fuel. Blocked fuel line. Faulty spark plug. Engine flooded.

Engine runs erratic Unit running in START position.

Spark plug wire loose. Blocked fuel line or stale fuel.

Vent in gas cap plugged. Water or dirt in fuel system. Dirty air cleaner. Carburetor out of adjustment.

Engine overheats Engine oil level low.

Air flow restricted. Carburetor not adjusted properly.

Occasional skip (hesitates) at high speed

Idles poorly Spark plug fouled, faulty or gap too

Excessive vibration Cutting blade loose or unbalanced.

Mower will not mulch grass Engine speed too low.

Uneven cut Wheels not positioned correctly.

Spark plug gap too close. Adjust gap to .030”.

wide. Carburetor improperly adjusted. Dirty air cleaner.

Bent cutting blade.

Wet grass. Excessively high grass.

Dull blade.

Refer to separate engine manual packed with your mower for more engine related information.

Engage blade control handle. Connect wire to spark plug. Move throttle lever to FAST or START position. Fill tank with clean, fresh gasoline. Clean fuel line. Clean, adjust gap or replace. Crank engine with throttle in FAST position.

Move throttle lever to FAST position. Connect and tighten spark plug wire. Clean fuel line; fill tank with clean, fresh gasoline. Clear vent. Drain fuel tank. Refill with fresh fuel. Clean air cleaner. Adjust carburetor.

Fill crankcase with proper oil. Remove blower housing and clean. Adjust carburetor.

Reset gap to .030” or replace spark plug. Adjust carburetor.

Clean air cleaner. Tighten blade and adapter. Balance blade.

Replace blade. Set throttle between 3/4 and full throttle.

Do not mow when grass is wet; wait until later to cut. Mow once at a high cutting height, then mow again at desired height or make a narrower cutting swath (1/2 width). Sharpen or replace blade.

Place all four wheels in same height position. Sharpen or replace blade.

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

call 1-800-800-7310 for the Customer Support Center.

Model 979

Ref.

No.

1 710-0134 Scr. Carr. 1/4-20 x .62 40 731-1901 Trail Shield 2 710-0654A Scr. TT:3/8-18:1.00 41 732-0842 Trail Shield Wire 3 710-0703 Scr. 1/4-20 x .750 42 611-0064-0665 Fr. Axle Ass’y. 4 712-0397 Wing Nut 1/4-20 43 710-1241 Hx Scr. Wash Hd. Hi.-Lo. 5 723-0233 Nut, Push .25 I.D. x .50 O.D. 44 710-1242 Scr. Torx, Truss Hi.-Lo. 6 736-0204 Wash. Fl. .334 I.D.x .62 x.03 45 714-0104 Cotter Pin .072 x 1.12 Lg. 7 782-0046A-0665 Deck - 21” 46 731-1829 Fr. Axle Cover, Yellow 8 710-0653 Scr. TT. 1/4-20 x .375 47 736-0286 Bowed Washer

9 710-0969 Scr. HL. 1/2-14 x .750 48 741-0492A Bush. Block .505 Dia. x .62 10 731-1828 Baffle 49 782-0565-0665 Control Arm 11 638-0012 Rear Axle Ass’y 50 734-1978 Wheel 8 x 2 Link, Yellow 12 682-0531 Pivot Arm Ass’y 51 734-1981 Wheel 9 x 2 Link Yellow, Slv. 13 682-7526 Trans. Axle Ass’y 52 736-0105 Spr. Wash. .401 x .870 x .063 14 682-7528 Chain Cover Ass’y 53 736-0504 Wave Wash .510 x .750 x .017 15 710-0653 Scr. TT 1/4-20 x .375 54 738-0102 Shld. Scr .498 x 1.445 x3/8-16 16 710-0751 Cap Screw HH 1/4-20 x .620 55 10622B Spring, Ratchet, Plastic 17 710-0896 Scr. AB 1/4-14 x .625 56 748-0381 Pawl - R.H. 18 710-1315 Scr. 3/8 116 x .25 748-0188B Pawl - L.H. (Not Illustrated) 19 711-0835 Clevis Pin .50 Dia. x 4.82 Lg. 58 16855 Ratchet Pawl Plate 20 713-0453 Chain-Endls. #48 .500P x 24L 59 738-0137A Scr. Shld. .340 x .285 21 714-0474 Cotter Pin .125O.D. x .75 60 712-0414 Top Lock Tab Weld Nut 1/4-20 22 720-0223 Grip 61 731-1426 Hubcap -Yellow 23 732-0803A Spring Lever 64 725-0157 Cable Tie 24 732-0832 Torsion Spring 65 710-0604 Hex Scr. 5/16-18 25 736-0270 Bell Wash. .285 x .75 x .082 66 754-0460 V-Belt 26 736-0369 Fl. Wash..508 I.D. 1.000 x.020 67 742-0741 21” Mulching Blade 27 738-0529 Nut Shld. .825 Dia. x .165 Lg. 68 753-0609 Blade Adapter Kit 28 741-0324 Hx.Flg. Brg..506 I.D. x .590 L. 69 736-0524A Blade Bell Suport 29 741-0522 Hx.Flg. Brg. .506 I.D. x.715 L. 70 710-1257 Hex Bolt 3/8-24x2.5”Lg. 30 741-0978 Hx. Slv. Brg..504 I.D. x .830 L. 72 735-0639 Spark Plug Insulator 31 748-0318 Wheel Rachet 73 731-1832 Side Discharge Chute 32 750-0151 Spa. .550 I.D. x /750 O.D. 74 731-1833 Mulch Cover 33 750-0515 Spa. .51 .D. x .70 O.D. x 38 L. 75 631-0066 Chute Ass’y 34 750-0807 Spa. .385 x .624 x .700 76 731-1713A Discharge Chute 35 750-1056 Shld. Spa. .385 I.D. X .715 Lg. 77 747-0965 Pivot Rod 36 782-0568 Brkt. - Ht. Adj. Spring 78 732-0819 Torsion Spring 37 682-3052A-0665 Handle Brkt. Ass’y. R.H. 79 726-0111 Push Cap 38 682-3053A-0665 Handle Brkt. Ass’y. L.H. 80 731-1874 Chute Door 39 710-1348 Scr. AB 1/4-14 x .500

Part No. Description

Ref.

No.

Part No. Description

Model 979

21 18

20 23

Model 979

Ref.

No.

1 710-1174 Bolt Cur. Carr. 5/16-18 x 2.0 22 731-0905A Lower Control Housing

2 714-0104 Cotter Pin .072 x 1.12 Lg. 23 731-0906 Cable Mounting Cap

3 720-0241 Knob Ass’y Wingnut 5/16-18 24 731-0620 Control Lever

4 726-0240 Strap 4.3 Lg. 25 746-0939 6 Spd. Cable

5 736-0451 Wash. Sad. .320 ID x.830 OD 26 746-0713 S.P. Cable

6 712-0429 Hex Nut 5/16 27 747-0824 Control Handle

8 710-1270 Oval C-Sunk Screw 28 720-0294 Foam Grip (2 Reqd.) 11 712-0324 Nut 1/4-20 Top locknut Insert 29 749-0439C Upper Handle 13 746-0883 Control Housing 30 749-0907A Lower Handle 14 746-0912 Control Cable 47” Lg. 31 631-0071 Grassbag Cover w/Label 16 731-0904A Upper Control Housing 32 747-0939 Pivot Rod 17 731-0924 6 Speed Shift Lever 33 726-0106 Cap Nut 18 713-0397 Gear Insert 34 747-0937 Frame - Grassbag 19 710-1667 C Sunk Tap Screw #10 x .75 L 35 747-0940A Rod, Support w/ Rope Guide 20 732-0627 Shift Lever Spring 36 664-0074 Grassbag 21 16864 6 Spd. Rack Cable Brkt. 37 736-0451 Saddle Washer

Part No. Code Description

Ref.

No.

Part No. Code Description

Labels

Ref No.

N/I 777S30116 Danger - Rt. Rear N/I 777D00535 Wheel Cover Label N/I 777S30118 Danger - Side Discharge N/I 777I20291 Ht. Adjuster Label N/I 777S30128 Warning - Above Deck

N/I 777D01180 Mulches, Bags, Dis-

Part No.

Code

Opening

charge

Description

Ref No.

N/I 777D01301 Model No. Label

Part No.

Code

Description

Model 979

12 10

Ref.

No.

1 746-0939 6 Spd. Cable 2 656-0613 Pulley Ass’y Multi- Spd. 3 710-0167 Scr. 1/4-20 x .50 Carr. 4 710-0896 Scr. AB 1/4-14 x .625 Hxinwsh 5 711-1114 Pivot Shaft 6 712-0287 Nut 1/4-20 7 732-0807 Torsion Spring LH 8 736-0270 Bell Wash. .265 X .75 X .062

9 736-0329 Lock Wash. 1/4 Reg Duty 10 736-0526 Wave Wash. 1.38 x .88 x .029 11 738-0924 Shld.Scr. .375 x1/4-14AB 12 750-1070 Slev Spcr .88 IDx1.00 OD x.48 13 750-1071 Slev Spcr .88ID x1.13ID x .12 14 756-0625 Roller Cable 15 782-7574-0665 6 Spd. Cable Adj. Bracket 16 782-7575-0665 6 Spd. Cable Mt. Bracket 17 782-7596 6 Sp. Control Arm 18 782-7597 6 Sp. Pivot Bracket 19 712-0138 Hex Nut 1/4-28

Part No. Code Description

Model 979

Ref.

No.

1 712-3025 Hx. Jam Nut

2 736-0425 Bell Wash. .325

3 756-0656 Pulley 4 736-3084 Fl. Wash. .510 x

5 712-0896 Hx. Jam Nut

6 782-7598 Belt Keeper 7 741-0600 Bearing 8 750-1050 Flange Spacer 9 682-0027A N Idler Bracket

10 710-0299 Hx. Cap Scr. 1/4-

11 732-0849A N Extension Spring 12 741-0682A N Bearing Sleeve 13 736-0570 Fl. Wash. .885 x

14 721-0329 Oil Seal 15 618-0253 Upper Housing

16 736-0616 N Thrust Wash.

17 717-1487 N Pinion Shaft

18 736-0314 Thr. Wash. 3/8 x

19 736-0569 Thr. Wash. .388

20 618-0252 Lower Housing

21 710-0642 Hx. Scr. 1/2-20 x

22 782-7601A N Cable Bracket 23 741-0674 Bearing 24 611-0066 Shaft Assembly 25 721-0325 Plug 26 717-1469 Gear 34 T. 27 711-1168 Output Shaft

28 741-0672 Flange Bearing 29 721-0329 Oil Seal 30 782-7595 Pivot Bracket 31 741-0324 Flange Bearing 32 736-0369 Wash. Fl. .508

33 741-0690 Bearing

Part No. Code Description

5/16-24

x .930 x .045

1.120 x .060

1/4-28

Assembly

28 x 1.00 Gr. 5

1.145 x.030

Assembly

.504 x .700 x .030

10 T.

.70 x .030

x .625 x .062

Assembly

.75

6 T.

I.D. x 1.00 O.D. x .020

MANUFACTURER’S LIMITED WARRANTY FOR:

For TWO YEARS from the date of retail purchase within the United States of America, its possessions and territories, MTD Products will, at its option, repair or replace, for the original purchaser, free of charge, any part or parts found to be defective in material or workmanship. This warranty covers units which have been operated and maintained in accordance with the owner’s instructions furnished with the unit, and which have not been subject to misuse, abuse, commercial use, neglect, accident, improper maintenance or alteration.

Normal wear parts or components thereof are subject to separate terms as noted below in the “No Fault Ninety Day Consumer Warranty” clause. All normal wear part failures will be covered on this product for a period of 90 days regardless of cause. After 90 days, but within the two year period, normal wear parts failures will be covered ONLY IF caused by defects in material or workmanship of OTHER component parts. Normal wear parts are defined as batteries*, belts, blades, blade adapters, grass bags, rider deck wheels, seats, snow thrower skid shoes, shave plates and tires.

How to obtain service: Warranty service is available, with proof of purchase, through your local authorized service dealer. To locate the dealer in your area, please check the yellow pages or contact the Customer Service Department of MTD Products, P O Box 368022, Cleveland, Ohio 44136-9722. Phone 1 (800) 800-7310. The return of a complete unit will not be accepted by the factory unless prior written permission has been extended by the Customer Service Department of MTD Products.

Transportation charges: Transportation charges for the movement of any power equipment unit or attachment are the responsibility of the purchaser.

Units exported out of the United States: MTD Products 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 Products’ authorized channels of export distribution.

Other Warranties:

1. The engine or component parts thereof carry separate warranties from their manufacturers. Please refer to the applicable manufacturer’s warranty on these items.

2. *Batteries are covered by a 90-day replacement warranty.

3. Log splitter pumps, valves and cylinders or component parts thereof are covered by a one year warranty.

4. All other warranties, express or implied, including any implied warranty of merchantability or fitness for a

particular purpose, are hereby expressly disclaimed in their entirety.

5. The provisions as set forth in this warranty provide the sole and exclusive remedy of MTD Products’

obligations arising from the sales of its products. MTD Products will not be liable for incidental or consequential loss or damage.

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. Certain disclaimers are not allowed in some states and therefore these may not apply to you under all circumstances.

Note: This warranty does not cover routine maintenance items such as lubricants, filters, blade sharpening and tune-ups, or adjustments such as brake adjustments, clutch adjustments or deck adjustments. Nor does this warranty cover normal deterioration of the exterior finish due to use or exposure.

Yard-Man 247.37979 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual