MTD 663, 643 User Manual

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Page 1

OPERATOR’S MANUAL

Snow Thrower

Models

643 & 663

IMPORTANT: READ SAFETY RULES AND INSTRUCTIONS CAREFULLY

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

covered, brush-covered or grass-covered land unless the engine’s exhaust system is equipped with a spark arrester meeting applicable local or state laws (if any). If a spark arrester is used, it should be maintained in effective working order by the operator. In the State of California the above is required by law (Section 4442 of the California Public Resources Code). Other states may have similar laws. Federal laws apply on federal lands. A spark arrester for the muffler is available through your nearest engine authorized service dealer or contact the service department, P.O. Box 361131 Cleveland, Ohio 44136-0019.

MTD LLC P.O. BOX 361131 CLEVELAND, OHIO 44136-0019

PRINTED IN U.S.A.

FORM NO.

769-00377.fm (6/02)

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TABLE OF CONTENTS

Content Page

Important Safe Operation Practices...................................................................3

Assembling Your Snow Thrower ....................................................................... 5

Know Your Snow Thrower.................................................................................6

Operating Your Snow Thrower ..........................................................................7

Making Adjustments ..........................................................................................10

Maintaining Your Snow Thrower........................................................................12

Servicing Your Snow Thrower ........................................................................... 13

Troubleshooting................................................................................................. 16

Parts List............................................................................................................17

FINDING MODEL NUMBER

This Operator’s Manual is an important part of your new Snow Thrower. 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 your local authorized dealer.

You can locate the model number by looking at the lower frame cover on the rear of your snow thrower. 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.

Copy the model number here:

MTD LLC

www.mtdproducts.com

P. O. BOX CLEVELAND,OH 330-220-4683 800-800-7310

361131

44136

Copy the serial number here:

ENGINE INFORMATION

The engine manufacturer is responsible for all engine-related issues with regards to performance, powerrating, specifications, warranty and service. Please refer to the engine manufacturer’s Owner’s/Operator’s Manual packed separately with your unit for more information.

CALLING CUSTOMER SUPPORT

Please do NOT return the unit to the retailer from which it was purchased, without first contacting Customer Support.

Should 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.

For more details about your unit, visit our website at www.mtdproducts.com

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SECTION 1: IMPORTANT SAFE OPERATION PRACTICES

This symbol points out important safety instructions, which if not followed, could endanger the personal safety and/or property of yourself and others. Read and follow all instructions in this manual before attempting to operate this machine. Failure to comply with these instructions may result in personal injury. When you see this symbol—heed its warning.

WARNING:

Engine Exhaust, some of its constituents, and certain vehicle components contain or emit chemicals known to the State of California to cause cancer, birth defects or other reproductive harm

DANGER: This machine was built to be operated according to the rules for safe operation in this

manual. As with any type of power equipment, carelessness or error on the part of the operator can result in serious injury. This machine is capable of amputating hands and feet and throwing objects. Failure to observe the following safety instructions could result in serious injury or death.

TRAINING

1. Read, understand, and follow all instructions on the machine and in the manual(s) before attempting to assemble and operate. Keep this manual in a safe place for future and regular reference and for ordering replacement parts.

2. Be familiar with all controls and their proper operation. Know how to stop the machine and disengage them quickly.

3. Never allow children under 14 years old to operate this machine. Children 14 years old and over should read and understand the operation instructions and safety rules in this manual and should be trained and supervised by a parent.

4. Never allow adults to operate this machine without proper instruction.

5. Thrown objects can cause serious personal injury. Plan your snow-throwing pattern to avoid discharge of material toward roads, bystanders and the like.

6. Keep bystanders, helpers, pets and children at least 75 feet from the machine while it is in operation. Stop machine if anyone enters the area.

7. Exercise caution to avoid slipping or falling, especially when operating in reverse.

PREPARATION

1. Thoroughly inspect the area where the equipment is to be used. Remove all doormats, newspapers, sleds, boards, wires and other foreign objects, which could be tripped over or thrown by the auger/impeller.

2. Always wear safety glasses or eye shields during operation and while performing an adjustment or repair to protect your eyes. Thrown objects which ricochet can cause serious injury to the eyes.

3. Do not operate without wearing adequate winter outer garments. Do not wear jewelry, long scarves or other loose clothing, which could become entangled in moving parts. Wear footwear which will improve footing on slippery surfaces.

4. Use a grounded three-wire extension cord and receptacle for all units with electric start engines.

5. Adjust collector housing height to clear gravel or crushed rock surfaces.

6. Disengage all clutch levers before starting the engine.

7. Never attempt to make any adjustments while engine is running, except where specifically recommended in the operator’s manual.

8. Let engine and machine adjust to outdoor temperature before starting to clear snow.

9. To avoid personal injury or property damage use extreme care in handling gasoline. Gasoline is extremely flammable and the vapors are explosive. Serious personal injury can occur when gasoline is spilled on yourself or your clothes, which can ignite. Wash your skin and change clothes immediately.

a. Use only an approved gasoline container. b. Extinguish all cigarettes, cigars, pipes and other

sources of ignition. c. Never fuel machine indoors. d. Never remove gas cap or add fuel while the

engine is hot or running. e. Allow engine to cool at least two minutes before

refueling. f. Never over fill fuel tank. Fill tank to no more than ½

inch below bottom of filler neck to provide space

for fuel expansion. g. Replace gasoline cap and tighten securely. h. If gasoline is spilled, wipe it off the engine and

equipment. Move machine to another area. Wait 5

minutes before starting the engine. i. Never store the machine or fuel container inside

where there is an open flame, spark or pilot light

(e.g. furnace, water heater, space heater, clothes

dryer etc.). j. Allow machine to cool at least 5 minutes before

storing.

OPERATION

1. Do not put hands or feet near rotating parts, in the auger/ impeller housing or discharge chute. Contact with the rotating parts can amputate hands and feet.

2. The auger/impeller clutch lever is a safety device. Never bypass its operation. Doing so makes the machine unsafe and may cause personal injury.

3. The clutch levers must operate easily in both directions and automatically return to the disengaged position when released.

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4. Never operate with a missing or damaged discharge chute. Keep all safety devices in place and working.

5. Never run an engine indoors or in a poorly ventilated area. Engine exhaust contains carbon monoxide, an odorless and deadly gas.

6. Do not operate machine while under the influence of alcohol or drugs.

7. Muffler and engine become hot and can cause a burn. Do not touch.

8. Exercise extreme caution when operating on or crossing gravel surfaces. Stay alert for hidden hazards or traffic.

9. Exercise caution when changing direction and while operating on slopes.

10. Plan your snow-throwing pattern to avoid discharge towards windows, walls, cars etc. Thus, avoiding possible property damage or personal injury caused by a ricochet.

11. Never direct discharge at children, bystanders and pets or allow anyone in front of the machine.

12. Do not overload machine capacity by attempting to clear snow at too fast of a rate.

13. Never operate this machine without good visibility or light. Always be sure of your footing and keep a firm hold on the handles. Walk, never run.

14. Disengage power to the auger/impeller when transporting or not in use.

15. Never operate machine at high transport speeds on slippery surfaces. Look down and behind and use care when in reverse.

16. If the machine should start to vibrate abnormally, stop the engine, disconnect the spark plug wire and ground it against the engine. Inspect thoroughly for damage. Repair any damage before starting and operating.

17. Disengage all clutch levers and stop engine before you leave the operating position (behind the handles). Wait until the auger/impeller comes to a complete stop before unclogging the discharge chute, making any adjustments, or inspections.

18. Never put your hand in the discharge or collector openings. Always use the clean-out tool provided to unclog the discharge opening. Do not unclog discharge chute while engine is running.Shut off engine and remain behind handles until all moving parts have stopped before unclogging.

19. Use only attachments and accessories approved by the manufacturer (e.g. wheel weights, tire chains, cabs etc.).

20. If situations occur which are not covered in this manual, use care and good judgment. Contact your dealer or

telephone 1-800-800-7310 for assistance and the name of your nearest servicing dealer.

MAINTENANCE AND STORAGE

1. Never tamper with safety devices. Check their proper operation regularly. Refer to the maintenance and adjustment sections of this manual.

2. Before cleaning, repairing, or inspecting machine disengage all clutch levers and stop engine. Wait until the auger/impeller come to a complete stop. Disconnect the spark plug wire and ground against the engine to prevent unintended starting.

3. Check bolts and screws for proper tightness at frequent intervals to keep the machine in safe working condition. Also, visually inspect machine for any damage.

4. Do not change the engine governor setting or over-speed the engine. The governor controls the maximum safe operating speed of the engine.

5. Snow thrower shave plates and skid shoes are subject to wear and damage. For your safety protection, frequently check all components and replace with original equipment manufacturer’s (OEM) parts only. “Use of parts which do not meet the original equipment specifications may lead to improper performance and compromise safety!”

6. Check clutch controls periodically to verify they engage and disengage properly and adjust, if necessary. Refer to the adjustment section in this operator’s manual for instructions.

7. Maintain or replace safety and instruction labels, as necessary.

8. Observe proper disposal laws and regulations for gas, oil, etc. to protect the environment.

9. Prior to storing, run machine a few minutes to clear snow from machine and prevent freeze up of auger/impeller.

10. Never store the machine or fuel container inside where there is an open flame, spark or pilot light such as a water heater, furnace, clothes dryer etc.

11. Always refer to the operator’s manual for proper instructions on off-season storage.

WARNING: 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.

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SECTION 2: ASSEMBLING YOUR SNOW THROWER

NOTE: References to right or left side of the snow thrower are determined from behind the unit in the operating position. The “operator’s position” is defined as standing directly behind the snow thrower, facing the handle panel.

Unpacking

• Remove screws from the top sides and ends of the shipping crate.

• Set panel aside to avoid tire punctures or personal injury.

• Remove and discard plastic bag that covers unit.

• Remove any loose parts included with unit (i.e., Operator’s Manual, etc).

• Roll unit out of crate.

Loose Parts

The augers are secured to the auger shaft with two shear bolts and hex lock nuts. If you hit a foreign object or ice jam, the snow thrower is designed so that the bolts may shear. Two replacement shear bolts and nuts are provided for your convenience. Store in a safe place until needed. See Figure 1.

Shear Bolts

Hex Lock Nuts

• Raise the upper handle assembly until it locks over the lower handle.

• Look at the lower rear of the snow thrower frame to be sure all the cables are aligned with the cable roller guides.

• Secure the upper handle and lower handle with the two plastic wing nuts, cupped washers and carriage bolts previously removed and tighten the upper two plastic wing nuts. See Figure 3.

Upper Shift Rod

Shift Rod Connector

Lower Shift Rod

Wing Nuts

Figure 3

• Slide the shift rod connector down over the end of the lower shift rod. Tap the connector until it locks over the lower shift rod. See Figure 3.

Figure 1

Assembly

WARNING: Disconnect the spark plug wire and ground it against the engine to prevent unintended starting.

• Remove the lower two plastic wing nuts, cupped

washers and carriage bolts from each side of the lower handle. See Figure 2.

Lower Handle

Wing Nuts, Washers, & Bolts

Figure 2

Handle Panel

Upper Handle

NOTE: If the connector is not properly assembled, the

shift rod will pivot and you will not be able to change speeds or change directions.

• If not already attached, slip the cables that run from the handle panel to the chute into the cable guide located on top of the engine. See Figure 4.

Cable Guide

Figure 4

• Unwrap the headlight wire, which is attached to the headlight beneath the handle panel.

• Wind the headlight wire around the right handle until excess slack is removed.

• Plug the wire from the headlight into the wire lead coming from the right side of the engine, beneath the fuel tank.

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SECTION 3: KNOW YOUR SNOW THROWER

Traction Control / Auger Control Lock

Headlight

Discharge Chute

Auger

WARNING: Read, understand, and follow all instructions and warnings on the machine and in this manual before operating.

Skid Shoe

Figure 5

Traction Control / Auger Control Lock

The traction control is located on the right handle. Squeeze the traction control to engage the wheel drive. Release to stop. See Figure 5.

This same lever also locks the auger control so you can turn the chute directional control without interrupting the snow throwing process. If the auger control is engaged along with the traction control, the operator can release the auger control (on the left handle) and the augers will remain engaged. Release the traction control to stop both the augers and track drive (auger control must also be released).

IMPORTANT:

changing speeds.

Always release tractional control before

Auger Drive Control

The auger drive control is located on the left handle. Squeeze the control grip to engage the augers. Release to stop the snow throwing action. (Traction control must also be released.) See Figure 5.

Skid Shoe

The position of the skid shoe is determined by the condition of the ground from where snow has to be removed. See Figure 5.

Shift Lever

Auger Drive Control

Chute Directional Control

Primer

Choke

Safety Ignition Key

Throttle Control

Clean-out

Shift Lever

The shift lever is located in the center of the handle panel and is used to determine both ground speed and direction of travel. It can be moved into any of eight positions. See Figure 5.

Forward

Your snow thrower has six forward (F) speeds. Position number one (1) is the slowest. Position number six (6) is the fastest.

Reverse

Your snow thrower has two reverse (R) speeds. R1 is the slower, while R2 is the faster of the two.

IMPORTANT:

changing speeds.

Always release tractional control before

Chute Directional Control

The chute directional control is located on left side of the snow thrower. See Figure 5.

To change the direction in which snow is thrown, turn chute directional control as follows:

• Crank clockwise to discharge to the left.

• Crank counterclockwise to discharge to the right.

Safety Ignition Key

The safety ignition key must be fully inserted in the switch before the unit will start. Remove the ignition key when the snow thrower is not in use. See Figure 5.

IMPORTANT:

Do NOT attempt to turn the key.

Tool

Electric Starter Button

Switch Box

Recoil Starter Handle

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Headlight

The headlight is on whenever the engine is running.

designed to clear a clogged discharged chute. Refer to Operating Your Snow Thrower section for more detailed information regarding the chute clean-out tool. See Figure 5.

Throttle Control

The throttle control is located on the engine. It regulates the speed of the engine and will shut off the engine when pushed down completely. See Figure 5.

WARNING: Never use your hand to clear a clogged discharged chute. Shut off engine and remain behind handles until all moving parts have stopped before unclogging.

Clean-Out Tool

The chute clean-out tool is fastened to the top of the auger housing with a mounting clip. The tool is

SECTION 4: OPERATING YOUR SNOW THROWER

Before Starting

WARNING: Read, understand, and follow all instructions and warnings on the machine and in this manual before operating.

Gas And Oil Fill-up

Service the engine with gasoline and oil as instructed in the separate engine manual packed with your snow thrower. Read instructions carefully.

WARNING: Use extreme care when handling gasoline. Gasoline is extremely flammable and the vapors are explosive. Never fuel machine indoors or while the engine is hot or running. Extinguish cigarettes, cigars, pipes an other sources of ignition.

• A plastic cup is provided inside the fuel fill opening

on the fuel tank. Remove and discard this cup before filling up the tank. Use the separate fuel tank cap to close after fill-up.

To Start Engine

• Attach spark plug wire to spark plug. Make certain the metal loop on end of the spark plug wire (inside the boot) is fastened securely over the metal tip on the spark plug.

• Make certain the fuel cut-off valve, if your snow thrower is so equipped, is in OPEN position.

• Make certain the auger and drive clutch levers are in the disengaged (released) position.

• Move throttle control up to FAST position. Insert ignition key into slot. Be certain it snaps into place.

Do not turn key.

NOTE: Engine will not start unless ignition key is

inserted into ignition slot in carburetor cover.

Electric Starter

• Determine that your house wiring is a three-wire grounded system. Ask a licensed electrician if you are not certain.

• If your house wiring system is not a three-wire grounded system, do not use this electric starter under any conditions.

WARNING: The electric starter is equipped with a grounded three-wire power cord and plug and is designed to operate on 120 volt AC household current. It must be used with a properly grounded three-prong receptacle at all times to avoid the possibility of electric shock. Follow all instructions carefully prior to operating the electric starter.

• If your home electrical system is grounded, but a three-hole receptacle is not available, one should be installed by a licensed electrician before using the electric starter.

• If you have a grounded three-prong receptacle, proceed as follows:

• Rotate choke knob to OFF position and do not prime engine.

• Connect power cord to switch box on engine. Plug the other end of power cord into a three-hole, grounded 120 volt AC receptacle.

• Push starter button on top of the engine to crank engine. As you crank the engine, move choke knob to FULL choke position.

• When engine starts, release starter button, and move choke gradually to OFF. If engine falters, move choke immediately to FULL and then gradually to OFF.

• When disconnecting the power cord, always unplug from the three-prong receptacle first and then from the snow thrower.

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Recoil Starter

• Rotate choke knob to FULL choke position (cold engine start). If engine is warm, place choke in OFF position instead of FULL.

• Push primer button two or three times. If engine is warm, push primer button once only.

NOTE: Always cover vent hole in primer button when pushing. Additional priming may be necessary for first start if temperature is below 15°F.

appropriate for the snow conditions that exist. Use the slower speeds until you are familiar with the operation of the snow thrower.

• Squeeze the auger control grip and the augers will turn. Release it and the augers will stop.

• Squeeze traction control grip and the snow thrower will move. Release it and drive motion will stop.

• NEVER move shift lever without releasing drive clutch.

• Grasp starter handle and pull rope out slowly, until it pulls slightly harder. Let rope rewind slowly.

• Pull starter handle rapidly. Do not allow handle to snap back. Allow it to rewind slowly while keeping a firm hold on the starter handle.

• As engine warms up and begins to operate evenly, rotate choke knob slowly to OFF position. If engine falters, return to FULL choke, then slowly move to OFF position.

To Stop Engine

• Run engine for a few minutes before stopping to help dry off any moisture on the engine.

• To help prevent possible freeze-up of starter, proceed as follows.

Electric Starter:

• Connect power cord to switch box on engine, then to 120 volt AC receptacle. With the engine running, push starter button and spin the starter for several seconds. The unusual sound made by spinning the starter will not harm engine or starter. Disconnect the power cord from receptacle first, and then from switch box.

Recoil Starter

• With engine running, pull starter rope with a rapid, continuous full arm stroke three or four times. Pulling the starter rope will produce a loud clattering sound, which is not harmful to the engine or starter.

• To stop engine, move throttle control to “stop” or “off” position.

• Remove ignition key. Do not turn key.

• Disconnect the spark plug wire from the spark plug

to prevent accidental starting while equipment is unattended.

NOTE: Do not lose ignition key. Keep it in a safe place. Engine will not start without the ignition key.

• Wipe all snow and moisture from the carburetor cover in the area of the control levers. Also, move control levers back and forth several times.

To Engage Augers

• To engage the augers and start throwing snow, squeeze the auger control grip against the left handle. Release to stop the augers.

Auger Control Test

IMPORTANT:

operating your snow thrower for the first time and at the start of each winter season.

Check the adjustment of the auger control as follows:

• When the auger control is released and in the disengaged “up” position, the cable should have very little slack. It should NOT be tight.

• In a well-ventilated area, start the snow thrower engine as instructed earlier in this section under the heading Starting Engine. Make sure the throttle is set in the FAST position.

• While standing in the operator’s position (behind the snow thrower), engage the auger.

• Allow the auger to remain engaged for approximately ten (10) seconds before releasing the auger control. Repeat this several times.

• With the engine running in the FAST position and the auger control lever in the disengaged “up” position, walk to the front of the machine.

• Confirm that the auger has completely stopped rotating and shows NO signs of motion.

IMPORTANT:

immediately return to the operator’s position and shut off the engine. Wait for ALL moving parts to stop before re-adjusting the auger control.

• To readjust the control cable, loosen the hex jam nut on the auger control cable “Z” fitting.

• Rotate the coupling end of the cable counterclockwise to provide more slack.

• Retighten the hex jam nut. See Figure 6.

• Repeat Auger Control Test to verify proper

adjustment has been achieved.

Perform the following test before

If the auger shows ANY signs of rotating,

To Engage Drive

• With the engine running near top speed, move the shift lever into one of the six FORWARD positions or two REVERSE positions. Select a speed

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Auger Control

Z-End

Jam Nut

Auger Control Cable

Snow Thrower Model Drift Cutter Kit

All models OEM-390-679

Drift

Cutter

Figure 6

Chute Clean-Out Tool

The chute clean-out tool is conveniently fastened to the rear of the auger housing with a mounting clip. Should snow and ice lodge itself in the discharge chute during operation, proceed as follows to safely clean the chute and chute opening:

• Release both the Auger Control Lever and the Traction/Auger Control Lock Lever

• Stop the engine by removing the ignition key.

• Remove the clean-out tool from the clip which

secures it to the rear of the auger housing.

• Use the shovel-shaped end of the clean-out tool to dislodge and scoop any snow and ice which has formed in and near the discharge chute.

WARNING: Never use your hands to clean snow and ice from the discharge chute or auger housing

• Refasten the clean-out tool to the mounting clip on the rear of the auger housing, reinsert the ignition key and start the snow thrower’s engine.

• While standing in the operator’s position (behind the snow thrower), engage the auger clutch lever for a few seconds to clear any remaining snow and ice from the discharge chute.

Drift Cutters (If Equipped)

Drift cutters should be used when operating the snow thrower in heavy drift conditions.

On models so equipped, drift cutters are assembled to the auger housing inverted. Remove the carriage bolts by unthreading the hex nuts which secure them, and reinstall the drift cutters in their proper position before operating the snow thrower. See Figure 7.

If your unit is not equipped with drift cutters, contact Customer Support as instructed on page 2 for information regarding price and availability.

Carriage Screws /

Hex Nuts

Figure 7

Tire Chains (If Equipped)

Tire chains should be used whenever extra traction is needed. If your unit is not equipped with tire chains, contact Customer Support as instructed on page 2 for information regarding price and availability.

Operating Tips

NOTE: Allow the engine to warm up for a few minutes. The engine will not develop full power until it reaches operating temperature.

WARNING: The temperature of the muffler and the surrounding areas may exceed

150

F. Avoid these areas.

• For the most efficient snow removal, remove snow immediately after it falls.

• Discharge the snow downwind whenever possible.

• Slightly overlap each previous path.

• Set the skid shoes 1/4" below the shave plate for

normal usage. The skid shoes may be adjusted upward (to lower the shave plate) for hard-packed snow. Adjust downward (to raise the shave plate) when using on gravel or crushed rock.

• Be certain to follow the precautions found in the To Stop Engine section to prevent possible freeze-up.

• Clean the snow thrower thoroughly after each use.

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SECTION 5: MAKING ADJUSTMENTS

WARNING: NEVER attempt to make any adjustments while the engine is running, except where specified in the operator’s manual.

Tire Pressure (Pneumatic Tires)

• The tires are overinflated for shipping purposes. Before operating check tire pressure and reduce pressure to between 15psi and 20 psi.

NOTE: If the tire pressure is not equal in both tires, the unit may pull to one side or the other.

Traction Control and Shift Lever

To check the adjustment of the traction control and shift lever, proceed as follows:

• To check the adjustment of the traction control clutch and shift lever, proceed as follows:

• With the engine off, move the shift lever all the way forward to the highest speed. With the traction control lever released, push the snow thrower forward. The unit should roll forward. Then engage the traction control grip. The wheels should stop turning.

• Now release the traction control grip and push the unit again.

• Move the shift lever back to the fast reverse position then all the way forward again. There should be no resistance in the shift lever, and the wheels should keep turning.

• If you have resistance when moving the shift lever or the wheels stop when they should not, loosen the jam nut on the traction control cable and unthread the cable one turn.

• If the wheels do not stop when you engage the traction control clutch grip, loosen the jam nut on the traction control cable and thread the cable in one turn.

• Recheck the adjustment and repeat as necessary. Tighten the jam nut to secure the cable when correct adjustment is reached.

WARNING: Drain the gasoline out of the snow thrower’s tank, or place a piece of plastic film under the gas cap to avoid spillage BEFORE making the adjustment.

To test further for correct adjustment, if necessary, proceed as follows:

• Tip the snow thrower forward, allowing it to rest on the auger housing. See Figure 8.

Frame Cover

Auger Housing

Figure 8

• Remove the frame cover underneath the snow thrower by removing the six self-tapping screws.

• With the traction control released, there must be clearance between the friction wheel and the drive plate in all positions of the shift lever.

• With the traction control engaged, the friction wheel must contact the drive plate. See Figure 9.

If adjustment is necessary:

• Loosen the jam nut on the traction drive cable and adjust the cable as necessary. Refer to Figure 6.

• Retighten the jam nut to secure the cable when correct adjustment is reached.

• Reassemble the frame cover.

NOTE: If you placed plastic film under the gas cap earlier, remove it now.

Sprocket

Gear Shaft

Friction Wheel

Figure 9

Axle Shaft

Chain

Drive Plate

Page 11

Shift Rod Adjustment

To adjust the shift rod, proceed as follows:

• Remove the hairpin clip and slide the shift rod connector up, to separate the upper shift rod from the lower shift rod. See Figure 10.

Shift Lever

Hairpin Clip

Flat Washer

Ferrule

Clutch Rod Connector

Upper Shift Rod

Hairpin Clip

Skid Shoes

The space between the shave plate and the ground can be adjusted. See Figure 11.

• For close snow removal on a smooth surface, raise skid shoes higher on the auger housing.

• Use a middle or lower position when the area to be cleared is uneven.

Carriage Bolts

Hex Nuts

Skid Shoes

Figure 11

Lower Shift Rod

Shift Arm

Figure 10

• Place the shift lever into the sixth (6) position.

• Rotate the shift arm clockwise (from the operator’s

position) as far as it will go.

• Thread the upper shift rod downward until the elbow on its lower end aligns with the hole found in the lower shift rod.

• Reconnect the upper shift rod to the lower shift rod by reinserting the hairpin clip removed earlier and sliding the shift rod connector back down into place.

IMPORTANT:

adjustment of the shift rod as instructed under Final Adjustments in the Assembly Section, before operating the snow thrower.

Make certain to check for correct

Chute Assembly

The distance snow is thrown can be adjusted by changing the angle of the chute assembly. To do so, stop the engine by removing the ignition key and loosen the plastic wing knobs found on either side of the discharge chute. Pivot the chute upward or downward before re-tightening the wing knobs.

Auger Control

Refer to Auger Control Test in the Operating Section to adjust the auger control.

WARNING: Do not operate this snow thrower on gravel as loose gravel can be easily picked up and thrown by the auger causing injury to the operator and/or damage to the snow thrower.

• Adjust skid shoes by loosening the four hex nuts and carriage bolts. Move skid shoes to desired position.

• Make certain the entire bottom surface of skid shoe is against the ground to avoid uneven wear on the skid shoes. Retighten nuts and bolts securely.

Carburetor

• Minor carburetor adjustment may be required to compensate for differences in fuel, temperature, altitude and load.

• Refer to the separate engine manual, packed with your unit, for carburetor adjustment information.

WARNING: If any adjustments need to be made to the engine while the engine is running (e.g. carburetor), keep clear of all moving parts. Be careful of muffler, engine and other surrounding heated surfaces.

Drive Wheels

• The wheels may be adjusted for two different methods of operation. Follow the steps below for adjustment. See Figure 12.

One Wheel Driving

• On the right side of the unit, place klick pin in the outside axle hole only. Do not place pin through

Page 12

wheel hub.This position gives power drive to the left wheel only, making the unit easier to maneuver.

Both Wheels Driving

• Rotate wheel assembly to align hole in the hub with the inner hole on the axle shaft. Insert klick pin in the hole. Outer axle shaft hole should be visible.

IMPORTANT:

click pin inserted through both the RIM and the OUTSIDE HOLE in the axle. Doing so can result in serious damage to the drive system.

NEVER operate the snow thrower with the

SECTION 6: MAINTAINING YOUR SNOW THROWER

Inside Hole In Axle

Click Pin In Outside Hole

Figure 12

WARNING: Before lubricating, repairing, or inspecting, disengage all clutch levers and stop engine. Wait until all moving parts have come to a complete stop. Disconnect spark plug wire and ground it against the engine to prevent unintended starting.

Lubrication

Engine

Refer to the separate engine manual packed with your unit for all engine lubrication instructions.

Wheels

• Oil or spray lubricant into bearings at wheels at least once a season. Pull klick pin, remove wheels, clean and coat axles with a multipurpose automotive grease. See Figure 13.

Gear Shaft

Lubricate the gear shaft with 6-n-1 grease at least once a season or after every 25 hours of operation (available at automotive stores, or order part number 737-0170). Refer to Figure 9.

IMPORTANT:

friction wheel and aluminum drive plate.

Keep all grease and oil off of the rubber

Gear Case

The gear case is lubricated with grease at the factory and it does not require checking. If disassembled for any reason, lubricate with 2 ounces of Shell Alvania grease EPR00, part number 737-0168.

IMPORTANT:

damage to the seals could result. Be sure the vent plug is free of grease in order to relieve pressure. See Figure 14.

Do not overfill the gear case, since

Auger Shaft

At least once a season, remove the shear bolts on the auger shaft. Spray lubricant inside the shaft and lubricate the plastic auger bearings at least once a season. See Figure 14.

Vent Plug

Klick Pin

Axle

Figure 13

Chute Directional Control

• The worm gear on the chute directional control should be greased with multipurpose automotive grease.

Plastic Bearing

Shear Bolts

Figure 14

Plastic Bearing

Page 13

Traction Control / Auger Control Lock

The cams on the ends of the control rods which interlock the traction drive and auger drive controls must be lubricated at least once a season or every 25 hours of operation. The cams can be accessed beneath the handle panel. Use a multi-purpose automotive grease.

Drive and Shifting Mechanism

Lubricate at least once a season or after every 25 hours of operation. Remove the rear cover, lubricate any

chains, sprockets, gears, bearings, shafts, and shifting mechanism at least once a season. Use engine oil or a spray lubricant. Avoid getting oil on the friction wheel rubber and aluminum drive plate. Refer to Figure 9.

There is a grease fitting on the top of the axle shaft which drives the rear track drive wheels on both sides of the unit. Grease these fittings every 25 hours or once a season.

SECTION 7: SERVICING YOUR SNOW THROWER

WARNING: Before servicing, repairing, or inspecting, disengage all clutch levers and stop engine. Wait until all moving parts have come to a complete stop. Disconnect spark plug wire and ground it against the engine to prevent unintended starting.

Engine

Refer to the separate engine manual packed with your unit for all engine maintenance procedures.

Augers

• The augers are secured to the spiral shaft with two shear bolts and hex lock nuts. If you hit a hard foreign object or ice jam, the snow thrower is designed so that the bolts may shear. Refer to Figure 14.

• If the augers will not turn, check to see if the bolts have sheared. Replacement shear bolts and hex lock nuts have been provided with the snow thrower. When replacing bolts, spray an oil lubricant into shaft before inserting new bolts.

IMPORTANT:

standard hex bolts. Any damage to the auger gearbox or other components as a result of doing so will NOT be covered by your snow thrower’s warranty.

NEVER replace the auger shear bolts with

Shave Plate and Skid Shoes

• The shave plate and skid shoes on the bottom of the snow thrower are subject to wear. They should be checked periodically and replaced when necessary.

• To remove skid shoes, remove the four carriage bolts, cupped washers and hex nuts which attach them to the snow thrower. Reassemble new skid shoes with the four carriage bolts, cupped washers (cupped side goes against skid shoes) and hex nuts. See Figure 15.

Skid Shoe

Carriage Bolts

Shave Plate

Skid Shoe

Figure 15

Hex Nuts

Belt Removal And Replacement

Auger Belts

NOTE: It is necessary to remove both belts in order to change either one. If changing just one belt, be certain to check the condition of the other belt.

• Remove the plastic belt cover at the front of the engine by removing the two self-tapping screws. See Figure 16.

Self-Tapping Screw

Belt Cover

Figure 16

Page 14

• Drain the gasoline from the snow thrower, or place a piece of plastic film under the gas cap.

• Tip the snow thrower up and forward so that it rests on its auger housing.

• Remove the six self-tapping screws from the frame cover underneath the snow thrower.

• Roll the front and rear auger belts off the auger drive pulley. See Figure 17.

• Unhook the idler spring from the hex bolt on the auger housing. See Figure 18.

• Back out the stop bolt until the support bracket rests on the auger pulley.

NOTE: Loosening the six nuts that connect the frame to the auger housing may aid in belt removal.

Drive Pulley

NOTE: If you placed plastic film under the gas cap, be

certain to remove it before operating the snow thrower

Drive Belt

• Follow the first four steps of the instructions for servicing the auger belts.

• Pull the idler pulley up and lift the belt off the wheel drive pulley and friction wheel disc. See Figure 17.

• Back out the stop bolt until the support bracket rests on the auger pulley. See Figure 19.

Friction Wheel

Stop Bolt

Drive Plate

Auger Pulley

Idler Pulley

Drive Belt

Idler Pulley

Auger Belts

Frame

Figure 17

• Lift the rear auger belt from the auger pulley, and slip the belt between the support bracket and the auger pulley. Repeat this step for the front auger belt.

• Replace both auger drive belts by following instructions in reverse order.

Friction Wheel

Support Bracket

Auger Pulley

Idler Spring

Support Bracket Spring

Auger Housing

Support Bracket

Auger Pulley

Figure 19

• Slip the belt between the friction wheel and drive disc. Remove and replace the belt. Reassemble following the instructions in reverse order.

NOTE: The support bracket must rest on the stop bolt after the new belt has been assembled.

Replacing Friction Wheel Rubber

The rubber on the friction wheel is subject to wear and should be checked after 25 hours of operation, and periodically thereafter. Replace the friction wheel rubber if any signs of wear or cracking are found.

• Drain the gasoline from the snow thrower, or place a piece of plastic under the gas cap.

• Tip the snow thrower up and forward, so that it rests on the housing.

• Remove the six self-tapping screws from the frame cover underneath the snow thrower.

• Remove the click pin that secures the left wheel to the axle and slide the wheel from the axle.

• Using a 7/8" wrench to hold the shaft, loosen, but do not completely remove, the hex nut and bell washer on the left end of gear shaft. See Figure 20.

• Lightly tap the hex nut to dislodge the ball bearing from the right side of frame before removing the hex nut and bell washer from left end of shaft.

• Move the gear shaft to the right and slide the friction wheel assembly from the shaft.

Figure 18

Page 15

Hex Nut /

Bell Washer

Figure 20

• Remove the four screws from the friction wheel assembly. Remove the friction wheel rubber from between the friction wheel plates. See Figure 21.

• Reassemble the new friction wheel rubber to the friction wheel plates and hub, tightening the six screws in rotation and with equal force.

• Position the friction wheel assembly up onto the pin of the shift rod assembly, and slide the hex shaft through the friction wheel assembly. Reassemble in reverse order.

Screws

Friction Wheel Rubber

Hub

WARNING: Drain fuel into an approved container outdoors, away from an open flame. Allow engine to cool. Extinguish cigarettes, cigars, pipes, and other sources of ignition prior to draining fuel. Fuel left in engine for extended periods deteriorates and will cause starting problems.

If unit is to be stored over 30 days, prepare for storage as follows:

• Remove gasoline from carburetor and fuel tank to prevent gum deposits from forming on these parts and causing possible malfunction of engine.

• Run engine until fuel tank is empty and engine stops due to lack of fuel.

• Drain carburetor by pressing upward on bowl drain, located below the carburetor cover.

NOTE: Fuel stabilizer is an acceptable alternative in minimizing the formation of fuel gum deposits during storage. Do not drain carburetor if using fuel stabilizer.

• Wipe equipment with an oiled rag to prevent rust.

• Remove spark plug and pour one ounce of engine

oil through spark plug hole into cylinder. Cover spark plug hole with rag. Crank engine several times to distribute oil. Replace spark plug.

• Follow the lubrication recommendations found in the Maintenance Section.

• Always store the snow thrower in a clean, dry area.

NOTE: When storing any type of power equipment in an unventilated or metal storage shed, care should be taken to rust proof the equipment. Using a light oil or silicone, coat the equipment, especially any chains, springs, bearings and cables.

Friction Wheel Plates

Figure 21

Off-Season Storage

WARNING: Never store the machine or fuel container indoors where there is an open flame, spark, or pilot light such as on water heater, furnace, clothes dryer, or other gas appliance.

Page 16

SECTION 8: TROUBLE SHOOTING

Trouble Possible Cause(s) Corrective Action

Engine fails to start Fuel tank empty, or stale fuel.

Blocked fuel line. Choke not in ON position Faulty spark plug. Key not in switch on engine. Spark plug wire disconnected. Primer button not depressed. Fuel shut-off valve closed (if so equipped).

Engine runs erratic Unit running on CHOKE.

Blocked fuel line or stale fuel.

Water or dirt in fuel system. Carburetor out of adjustment.

Loss of power Spark plug wire loose.

Gas cap vent hole plugged. Exhaust port plugged.

Engine overheats Carburetor not adjusted

properly. Incorrect fuel mixture.

Excessive vibration Loose parts or damaged auger. Stop engine immediately and disconnect spark plug wire. Tighten

Unit fails to propel itself Incorrect adjustment of drive

cable.

Drive belt loose or damaged. Unit fails to discharge snow

Discharge chute clogged.

Foreign object lodged in auger.

Incorrect adjustment of drive

cable.

Drive belt loose or damaged.

Fill tank with clean, fresh gasoline. Fuel will not last over thirty days unless a fuel stabilizer is used. Clean fuel line. Move switch to ON position Clean, adjust gap or replace. Insert key. Connect spark plug wire. Refer to the engine manual. Open fuel shut-off valve.

Move choke lever to OFF position. Clean fuel line; fill tank with clean fresh gasoline. Fuel will not last over thirty days unless a fuel stabilizer is used. Drain fuel tank. Refill with fresh fuel. Refer to the engine manual. Connect and tighten spark plug wire. Remove ice and snow from cap. Be certain vent hole is clear. Clean following the engine manual. Refer to the engine manual packed with your unit or have carburetor adjusted by an authorized service dealer. Drain fuel tank. Refill with proper fuel mixture.

all bolts and nuts. Make all necessary repairs. If vibration continues, have unit serviced by an authorized service dealer. Adjust drive cable.

Replace drive belt. Stop engine immediately and disconnect spark plug wire. Clean discharge chute and inside of auger housing. Stop engine immediately and disconnect spark plug wire. Remove object from auger. Adjust drive cable.

Replace drive belt.

NOTE: For repairs beyond the minor adjustments above, contact your local authorized service dealer.

Page 17

Models 643 & 663

Ref.

No.

1. 618-0123 RH Housing

2. 618-0124 LH Housing

3. 710-0642 Self Tapping Screw, 1/4-20 x .75

4. 711-0910A Spiral Axle, 28”

5. 714-0161 Hi-Pro Key, 3/16 x 5/8

6. 715-0143 Spring Spiral Pin, .25 x 1.25

7. 717-0528 Worm Gear, 20-tooth

8. 717-0526 Worm Shaft

9. 718-0186 Thrust Collar

10. 721-0325 Grease Plug

11. 721-0327 Grease Seal

12. 736-0351 Flat Washer, .76 x 1.5 x .030

13. 736-0369 Flat Washer, .508 x 1.0 x .020

14. 736-0445 Flat Washer, .76 x 1.5 x .060

15. 741-0662 Flange Bearing, .75 x 1.0 x .59

16. 741-0663 Flange Bearing, .503 ID x .75 OD

17. 618-0122A Gear Ass’y Complete, 28”

Part No. Part Description

Page 18

Models 643 & 663

Page 19

Models 643 & 663

Ref.

No.

1. 684-0008A Shift Arm Assembly

2. 710-0458 Carriage Bolt 5/16-18 x 1.75”

3. 710-0449 Carriage Bolt 5/16-18 x 2.25”

4. 710-0788 TT Screw 1/4-20 x 1”

5. 712-0429 Hex Lock Nut 5/16-18

6. 746-0778 Z Fitting Cable

7. 710-1880 Hex Screw 5/16-18 x .75”

8. 711-0677 Ferrule

9. 747-0697 Eyebolt

10. 712-3068 Hex Nut 5/16-18

11. 714-0104 Cotter Pin

12. 720-0284 Handle Knob

13. 720-0274 Grip

14. 736-0242 Belleville Washer

15. 736-0275 Flat Washer

16. 736-0451 Saddle Washer

17. 747-0620A Shift Rod: Upper

18. 747-0621 Shift Rod: Lower

19. 749-0951 Lower Handle

20. 749-0952A Upper Handle: L Style RH

21. 749-0953A Upper Handle: L Style LH

22. 750-0963 Connector: Shift Rod

23. 784-5647 Chute Crank Bracket

24. 736-0509 Washer .72 OD x .135 ID

25. 710-0262 Carriage Bolt: 5/16-18 x 1.5”

26. 710-0451 Carriage Bolt: 5.16-18 x .750”

27. 710-0599 TT Screw: 1/4-20 x 0.5”

28. 712-3010 Hex Nut 5/16-18

30. 732-0746 Torsion Spring

31. 710-0276 Carriage Screws 5/16-18 x 1.0

32. 735-0199A Rubber Bumper

35. 712-3027 Hex Flange Lock Nut

38. 731-0851A Chute Flange Keeper

Part No. Part Description

735-0234 Grommet Only

Ref.

No.

39. 731-1300B Lower Chute

40. 710-3015 Hex Cap Screw 1/4-20 x .75

41. 731-0921 Upper Chute

43. 736-0159 5/16 Washer

47. 746-0901 Control Cable

48. 741-0475 Plastic Bushing

49. 736-0159 5/16 Washer

53. 684-0036A Handle Assembly RH

54. 684-0037B Handle Assembly LH

55. 710-1003 Special Hex Screw

56. 712-0271 Hex Sems Nut: 1/4-20

57. 712-0693 Hex Nut

59. 720-0232 Shift Knob

60. 725-1672 Lamp Housing

63. 725-1658 Halogen Lamp: 50W, 12V

64. 726-0152 Mounting Clamp

65. 731-04144 Handle Panel

67. 747-1136 Headlight Retainer

68. 714-0507 Cotter Pin: 3/32 x .75

69. 747-0877 Cam Rod

70. 784-5680 RH Handle Support Bracket

71. 784-5679 LH Handle Support Bracket

72. 748-0362 Cam Handle Lock

73. 748-0363 Handle Lock Pawl

74. 732-0145 Compression Spring: .36 x 1.0

75. 710-0459A Hex Cap Screw: 3/8-24 x 1.5

76. 784-5619A Shift Handle

77. 712-0116 Jam Nut, 3/8-24

78. 732-0193 Comp. Spring: .39 x .6 x .88

79. 736-0105 Bell Washer

80. 784-5682 RH Handle Support Bracket

81. 784-5681 LH Handle Support Bracket

82. 711-0653 Clevis Pin

83. 684-0103 Handle Panel

Part No. Part Description

Page 20

Models 643 & 663

Page 21

Models 643 & 663

Ref.

No.

1. 712-0116 Lock Jam Nut 3/8-24

2. 756-0178 Flat Idler

3. 784-5632B Auger Idler Arm

4. 710-0459A Hex Cap Screw 3/8-24 x 1.50

5. 738-0281 Shoulder Screw

6. 736-0167 Wave Washer

7. 732-0611 Extension Spring

8. 712-3068 Hex Nut 5/16-18

9. 710-0276 Carriage Bolt, 5/16-18 x 1.00

10. 736-0119 Lock Washer 5/16

11. 05931A Bearing Housing

12. 741-0309 Ball Bearing

13. 710-0451 Carriage Bolt, 5/16-18 x .75

14. 705-5226 Chute Reinforcement

15. 684-0041D 28” Housing Ass’y

16. 712-3010 Hex Nut 5/16-18

17. 712-0429 Lock Nut 5/16-18

18. 736-0242 Belleville Washer

19. 736-0231 Flat Wshr, .344ID x 1.125 OD

24. 784-5618 Bearing Housing

26. 710-0604A Hex Screw 5/16-18

27. 736-0169 Lock Washer 3/8

28. 712-0798 Hex Nut 3/8-16

29. 741-0245 Hex Flange Bearing

30. 784-5580 Slide Shoe

Part No. Part Description

Ref.

No.

31. 736-0242 Bell Washer

32. 712-3010 Hex Nut 5/16-18

33. 784-5582A Shave Plate

34. 710-0260 Carriage Bolt 5/16-18 x .62

35. 684-0065 Impeller Assembly

36. 715-0114 Pin

37. 618-0122A 28” Gear Ass’y

38. 605-5196A 28” Spiral RH

39. 736-0188 Flat Washer

40. 741-0493A Flange Bushing

41. 605-5197A 28” Spiral LH

42. 710-0890A Shear Bolt 5/16-18 x 1.5

43. 714-0104 Hairpin Clip

44. 736-0185 Flat Washer

47. 705-5204A Chute Crank

48. 720-0201A Chute Crank Knob

49. 726-0100 Push Cap

50. 712-3068 Hex Nut 5/16-18

51. 731-2643 Clean-Out Tool

52. 731-2635 Clean-Out Tool Mount

Part No. Part Description

784-5038B Skid Shoe (If Equipped)

777I20711 Label: Handle Panel (L) 777I20722 Label: Handle Panel (R) 777S30514 Label: Housing Danger 777S30511 Label: Chute Danger

Page 22

Models 643 & 663

IMPORTANT: For a proper working machine, use Factory Approved Parts. V-BELTS are specially designed to engage and disengage safely. A substitute (non OEM) V-Belt can be dangerous by not disengaging completely

Page 23

Models 643 & 663

Ref.

No.

1. 710-1652 Hex Washer Screw 1/4-20 x .625

2. 731-1324 Belt Cover

3. 732-0710 Extension Spring

4. 710-0627 Hex Screw 5/16-24 x .75

5. 710-3005 Hex Cap Screw 3/8-16 x 1.25

6. 05896A Drive Clutch Idler Bracket

7. 748-0234 Shoulder Spacer

8. 756-0987 Pulley Half

9. 754-0346 V-Belt

10. 756-0986 Pulley Half

11. 736-0270 Bell Washer

12. 710-0230 Hex Cap Screw 1/4-28 x .50

13. 756-0313 Flat Idler

14. 710-1245B Lock Hex Cap Screw 5/16-24

15. 712-0181 Lock Jam Nut 3/8-16

16. 756-0569 Pulley Half

17. 736-0242 Bell Washer

18. 736-0505 Flat Washer

19. 754-0430B Belt

20. 756-0967 Auger Pulley

21. 736-0247 Flat Washer 3/8 x 1.25 OD

22. 736-0331 Bell Washer

23. 710-0696 Hex Cap Screw 3/8-24

24. 748-0360 Adapter Pulley

25. 710-0654A Hex Screw 3/8-16 x 1.0

26. 629-0071 Extension Cord

27. OEM-390-987 Electric Start Kit

28. 712-0324 Lock Nut, 1/4-20

29. 736-0173 Flat Washer, .28 x .74 x .063

30. 732-0705 Cable Guide

31. 738-0830 Axle 16”

32. 734-1712A Wheel Ass’y Comp 16.5” x 4.8”

33. 734-1525 Tire 16.0” x 6.50” x 8.0”

34. 734-0255 Tubeless Air Valve

35. 734-1711A Rim Assembly

36. 629-0059 Upper Harness Assembly

Part No. Part Description

Page 24

Models 643 & 663

Drive Clutch

Cable

Auger Clutch Cable

16” Wheels

13” or 15” Wheels

Auger Clutch Cable

Blower Housing

Page 25

Models 643 & 663

Ref.

No.

1. 710-0599 Hex Screw

2. 784-5688 Drive Cable Guide Bracket

3. 784-5687A Auger Clutch Cable Bracket

4. 756-0625 Roller Cable

5. 738-0924 Hex Screw 1/4-28

6. 784-5630B Frame Assembly

7. 741-0563 Ball Bearing

8. 736-0105 Bell Washer

9. 712-0116 Lock Jam Nut

10. 741-0598 Hex Flange Bearing

11. 736-0188 Flat Washer

12. 784-5689A Front Support Guide Bracket

13. 710-0538 Lock Hex Screw

14. 736-0242 Bell Washer .340 ID x .872 OD

15. 714-0474 Cotter Pin

16. 736-0160 Flat Washer .536 ID x .930 OD

17. 710-0809 Hex Washer Screw 1/4-20

18. 784-5590 Frame Shift Bracket

19. 784-5638 Frame Cover

20. 710-0599 Hex Washer Screw 1/4-20

21. 736-0351 Flat Washer .760 ID x .50 OD

22. 717-1445 Gear

23. 714-0126 Key

24. 717-1444 7-Tooth Shaft

Part No. Part Description

Ref.

No.

25. 715-0249 Roll Pin

26. 714-0143 Klik Pin

27. 684-0042C Friction Wheel Assembly

28. 656-0012A Friction Disc Wheel

29. 684-0013B Wheel Shift Rod Assembly

30. 746-0897 Drive Cable

31. 748-0190 Spacer

32. 684-0021 Friction Wheel Bracket Assembly

33. 732-0264 Extension Spring

34. 712-0711 Jam Nut 3/8-24

35. 746-0898B Drive Cable

36. 738-0869 Axle 13” Wheels

37. 790-00010 Friction Plate

38. 735-0243B Friction Wheel Rubber

39. 718-0301A Friction Wheel Hub

40. 618-0063A Friction Wheel Bearing

41. 710-1652 Tap Screw 1/4-20

42. 712-0703A Insert Nut 5/16-18

43. 711-1364 Clevis Pin

44. 736-0142 Flat Washer .281 ID x .50 OD

45. 714-0507 Cotter Pin

46. 790-00011 Friction Plate

Part No. Part Description

738-0830 Axle 16” Wheels

Page 26

Notes

Page 27

Page 28

MANUFACTURER’S LIMITED WARRANTY FOR:

The limited warranty set forth below is given by MTD LLC with respect to new merchandise purchased and used in the United States, its possessions and territories.

MTD LLC warrants this product against defects for a period of two (2) years commencing on the date of original purchase and will, at its option, repair or replace, free of charge, any part found to be defective in materials or workmanship. This limited warranty shall only apply if this product has been operated and maintained in accordance with the Operator’s Man- ual furnished with the product, and has not been subject to misuse, abuse, commercial use, neglect, accident, improper maintenance, alteration, vandalism, theft, fire, water, or damage because of other peril or natural disaster. Damage resulting from the installation or use of any accessory or attachment not approved by MTD LLC for use with the product(s) covered by this manual will void your warranty as to any resulting damage.

Normal wear parts or components thereof are subject to separate terms as follows: All normal wear parts or component failures will be covered on the product for a period of 90 days regardless of cause. After 90 days, but within the two year period, normal wear part failures will be covered ONLY IF caused by defects in materials or workmanship of OTHER component parts. Normal wear parts and components include, but are not limited to: batteries, belts, blades, blade adapters, grass bags, rider deck wheels, seats, snow thrower skid shoes, shave plates, auger spiral rubber, tires.

HOW TO OBTAIN SERVICE: Warranty service is available, WITH PROOF OF PURCHASE, through your local authorized service dealer. To locate the dealer in your area, check your Yellow Pages, or contact MTD LLC at P.O. Box 361131, Cleveland, Ohio 44136-0019, 1-800-800-7310, 1-330-2204683 or log on to our Web site at www.mtdproducts.com.

This limited warranty does not provide coverage in the following cases: a. The engine or component parts thereof. These items

carry a separate manufacturer’s warranty. Refer to the applicable manufacturer’s warranty for terms and conditions.

b. Log splitter pumps, valves, and cylinders have a sepa-

rate one year warranty.

c. Routine maintenance items such as lubricants, filters,

blade sharpening, tune-ups, brake adjustments, clutch adjustments, deck adjustments, and normal deterioration of the exterior finish due to use or exposure.

d. MTD LLC does not extend any warranty for products

sold or exported outside of the United States, its possessions and territories, except those sold through MTD LLC’s authorized channels of export distribution.

e. Parts that are not genuine MTD parts are not covered by

this warranty.

f. Service completed by someone other than an authorized

service dealer is not covered by this warranty.

g. Transportation charges and service calls are not

covered.

No implied warranty, including any implied warranty of merchantability of fitness for a particular purpose, applies after the applicable period of express written warranty above as to the parts as identified. No other express warranty, whether written or oral, except as mentioned above, given by any person or entity, including a dealer or retailer, with respect to any product, shall bind MTD LLC. During the period of the warranty, the exclusive remedy is repair or replacement of the product as set forth above.

The provisions as set forth in this warranty provide the sole and exclusive remedy arising from the sale. MTD LLC shall not be liable for incidental or consequential loss or damage including, without limitation, expenses incurred for substitute or replacement lawn care services or for rental expenses to temporarily replace a warranted product.

Some states do not allow the exclusion or limitation of incidental or consequential damages, or limitations on how long an implied warranty lasts, so the above exclusions or limitations may not apply to you.

In no event shall recovery of any kind be greater than the amount of the purchase price of the product sold. Alteration

of safety features of the product shall void this warranty.

You assume the risk and liability for loss, damage, or injury to you and your property and/or to others and their property arising out of the misuse or inability to use the product.

This limited warranty shall not extend to anyone other than the original purchaser or to the person for whom it was purchased as a gift.

HOW STATE LAW RELATES TO THIS WARRANTY: This limited warranty gives you specific legal rights, and you may also have other rights which vary from state to state.

MTD LLC, P.O. BOX 361131 CLEVELAND, OHIO 44136-0019 1-800-800-7310

MTD 663, 643 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual