Mtd 643 User Manual

Snow ThrowerModels 643 & 663IMPORTANT: READ SAFETY RULES AND INSTRUCTIONS CAREFULLYMTD LLC P.O. BOX 361131 CLEVELAND, OHIO 44136-0019Warning: This

10SECTION 5: MAKING ADJUSTMENTSWARNING: NEVER attempt to make anyadjustments while the engine is running,except where specified in the operator’smanu

11Shift Rod AdjustmentTo adjust the shift rod, proceed as follows:• Remove the hairpin clip and slide the shift rod connector up, to separate the uppe

12wheel hub.This position gives power drive to the left wheel only, making the unit easier to maneuver.Both Wheels Driving• Rotate wheel assembly to a

13Traction Control / Auger Control LockThe cams on the ends of the control rods which interlock the traction drive and auger drive controls must be lu

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 rest

15Figure 20• Remove the four screws from the friction wheel assembly. Remove the friction wheel rubber from between the friction wheel plates. See Fig

16SECTION 8: TROUBLE SHOOTINGNOTE: For repairs beyond the minor adjustments above, contact your local authorized service dealer.Trouble Possible Caus

1721246710914118161315Models 643 & 663513317Ref. No.Part No. Part Description1. 618-0123 RH Housing 2. 618-0124 LH Housing3. 710-0642 Self Tapping

18Models 643 & 66314102141216320606367655554817112221184111151971453596869692782707272732768717427566476777879111575812783801313422626489949232814

19Models 643 & 663Ref. No.Part No. Part Description1. 684-0008A Shift Arm Assembly2. 710-0458 Carriage Bolt 5/16-18 x 1.75”3. 710-0449 Carriage Bo

2TABLE OF CONTENTSContent PageImportant Safe Operation Practices...3Assembling Your Sn

20Models 643 & 66312345678910111214151316102618272813303132331618353436373839414042174039292491930315051524948474344

21Models 643 & 663Ref. No.Part No. Part Description1. 712-0116 Lock Jam Nut 3/8-242. 756-0178 Flat Idler 3. 784-5632B Auger Idler Arm4. 710-0459A

22Models 643 & 6631234567489101112131415161718191916161620212223242526272829303132333435IMPORTANT: For a proper working machine, use Factory Appro

23Models 643 & 663Ref. No.Part No. Part Description1. 710-1652 Hex Washer Screw 1/4-20 x .6252. 731-1324 Belt Cover3. 732-0710 Extension Spring4.

24Models 643 & 66311234455616” Wheels13” or 15” Wheels47789101011111241513141516171811920212223242525262829113031323334835Drive ClutchCableAuger C

25Models 643 & 663Ref. No.Part No. Part Description1. 710-0599 Hex Screw 2. 784-5688 Drive Cable Guide Bracket3. 784-5687A Auger Clutch Cable Brac

26Notes

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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

3SECTION 1: IMPORTANT SAFE OPERATION PRACTICESThis symbol points out important safety instructions, which if not followed, could endanger the persona

44. 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 poorl

5SECTION 2: ASSEMBLING YOUR SNOW THROWERNOTE: References to right or left side of the snowthrower are determined from behind the unit in theoperatin

6SECTION 3: KNOW YOUR SNOW THROWERFigure 5WARNING: Read, understand, and followall instructions and warnings on themachine and in this manual beforeo

7HeadlightThe headlight is on whenever the engine is running.Throttle ControlThe throttle control is located on the engine. It regulates the speed of

8Recoil Starter• Rotate choke knob to FULL choke position (cold engine start). If engine is warm, place choke in OFF position instead of FULL.• Push p

9Figure 6Chute Clean-Out ToolThe chute clean-out tool is conveniently fastened to the rear of the auger housing with a mounting clip. Should snow and