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Owner's Manual
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.
769-00377.fm
FORM NO.
(6/02)
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Summary of Contents for MTD 643
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Page 1: Snow Thrower
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. -
Page 2: Table Of Contents
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. MTD LLC P. O. BOX 361131 CLEVELAND,OH 44136 330-220-4683 www.mtdproducts.com... -
Page 3: Important Safe Operation Practices
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. -
Page 4: Maintenance And Storage
Never operate with a missing or damaged discharge chute. Keep all safety devices in place and working. Never run an engine indoors or in a poorly ventilated area. Engine exhaust contains carbon monoxide, an odorless and deadly gas. Do not operate machine while under the influence of alcohol or drugs. -
Page 5: Assembling Your Snow Thrower
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. -
Page 6: Know Your Snow Thrower
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. Traction Control / Auger Control Lock The traction control is located on the right handle. -
Page 7: Operating Your Snow Thrower
Headlight The headlight is on whenever the engine is running. 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. Clean-Out Tool The chute clean-out tool is fastened to the top of the auger housing with a mounting clip. -
Page 8: To Stop Engine
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. -
Page 9: Operating Tips
Auger Control Z-End Jam Nut Auger Control Cable 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: •... -
Page 10: Making Adjustments
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. -
Page 11: Shift Rod Adjustment
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. Hairpin Clip Flat Washer Clutch Rod Connector Figure 10... -
Page 12: Maintaining Your Snow Thrower
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. -
Page 13: Servicing Your Snow Thrower
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. -
Page 14: Replacing Friction Wheel Rubber
• 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. - Page 15 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.
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Page 16: Troubleshooting
SECTION 8: TROUBLE SHOOTING Trouble Possible Cause(s) 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). -
Page 17: Parts List
Models 643 & 663 Ref. Part No. Part Description 618-0123 RH Housing 618-0124 LH Housing 710-0642 Self Tapping Screw, 1/4-20 x .75 711-0910A Spiral Axle, 28” 714-0161 Hi-Pro Key, 3/16 x 5/8 715-0143 Spring Spiral Pin, .25 x 1.25 717-0528... - Page 18 Models 643 & 663...
- Page 19 Models 643 & 663 Ref. Part No. Part Description 684-0008A Shift Arm Assembly 710-0458 Carriage Bolt 5/16-18 x 1.75” 710-0449 Carriage Bolt 5/16-18 x 2.25” 710-0788 TT Screw 1/4-20 x 1” 712-0429 Hex Lock Nut 5/16-18 746-0778 Z Fitting Cable 710-1880 Hex Screw 5/16-18 x .75”...
- Page 20 Models 643 & 663...
- Page 21 Models 643 & 663 Ref. Part No. Part Description 712-0116 Lock Jam Nut 3/8-24 756-0178 Flat Idler 784-5632B Auger Idler Arm 710-0459A Hex Cap Screw 3/8-24 x 1.50 738-0281 Shoulder Screw 736-0167 Wave Washer 732-0611 Extension Spring 712-3068 Hex Nut 5/16-18 710-0276 Carriage Bolt, 5/16-18 x 1.00...
- 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. 710-1652 731-1324 732-0710 710-0627 710-3005 05896A 748-0234 756-0987 754-0346 756-0986 736-0270 710-0230 756-0313 710-1245B 712-0181 756-0569 736-0242 736-0505 754-0430B 756-0967 736-0247 736-0331 710-0696 748-0360 710-0654A 629-0071 OEM-390-987 712-0324 736-0173 732-0705 738-0830 734-1712A 734-1525 734-0255 734-1711A 629-0059 Part No.
- Page 24 Models 643 & 663 Blower Housing Drive Clutch Cable Auger Clutch Cable 16” Wheels 13” or 15” Wheels 9 10 Auger Clutch Cable...
- Page 25 Models 643 & 663 Ref. Part No. Part Description 710-0599 Hex Screw 784-5688 Drive Cable Guide Bracket 784-5687A Auger Clutch Cable Bracket 756-0625 Roller Cable 738-0924 Hex Screw 1/4-28 784-5630B Frame Assembly 741-0563 Ball Bearing 736-0105 Bell Washer 712-0116 Lock Jam Nut...
- Page 26 Notes...
- 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...