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O

PERATOR’S

 

M

ANUAL

IMPORTANT: READ SAFETY RULES AND INSTRUCTIONS CAREFULLY

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

Model Series

993

Snow Thrower

PRINTED IN U.S.A.

FORM NO. 770-10278

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 368022 Cleveland, Ohio 44136-9722.

                     (06/99) 

Summary of Contents for 770-10278 993

Page 1: ...ss 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 arrest...

Page 2: ...R 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 Suppo...

Page 3: ...ly when operating in reverse 2 PREPARATION Thoroughly inspect the area where the equipment is to be used and remove all door mats sleds boards wires and other foreign objects Disengage all clutches before starting engine Do not operate equipment without wearing adequate winter outer garments Do not wear jewelry long scarfs or other loose clothing which could become entangled in moving parts Wear f...

Page 4: ...tor impeller when transporting or not in use Use only attachments and accessories approved by the manufacturer of snow thrower such as wheel weights counter weights cabs etc Never operate the snow thrower without good visibility or light Always be sure of your footing and keep a firm hold on the handles Walk never run Muffler and engine become hot and can cause a burn Do not touch 4 MAINTENANCE AN...

Page 5: ... 4 8 Secure the upper handle and lower handle with the two plastic wing nuts cupped washers and carriage bolts previously removed See Figure 4 9 Slide the shift rod connector down over the end of the lower shift rod See Figure 5 Tap the connector until it locks on the lower shift rod NOTE If the connector is not properly assembled the shift rod will pivot and you will not be able to shift gears or...

Page 6: ...justment See Figure 8 The space between the shave plate and the ground can be adjusted For close snow removal place skid shoes in the low position Use middle or high position when area to be cleared is uneven See Figure 8 Adjust skid shoes by loosening the six hex nuts and carriage bolts and moving skid shoes to desired position Make certain the entire bottom surface of skid shoe is against the gr...

Page 7: ... the right trigger lever and guide the snow thrower to the right To turn left squeeze the left trigger lever and guide the snow thrower to the left These controls should be used while operating your snow thrower in open areas until you become familiar with their operation Lift both triggers for easy transport when the engine is not running CHUTE DIRECTIONAL CONTROL See Figure 10 The chute directio...

Page 8: ... inside the boot is fastened securely over the metal tip on the spark plug See Figure 13 2 Make certain the auger and traction control clutch levers are in the disengaged released position 3 Move throttle control up to FAST position Insert ignition key into slot Refer to Figure 12 Be certain it snaps into place Do not turn key 4 Rotate choke knob to OFF position Figure 13 Figure 14 5 Connect power...

Page 9: ...sing the traction control clutch TIRE PRESSURE Pneumatic tires only Tires are over inflated for shipping purposes Correct tire pressure is 10 15 psi Check sidewall of tire for manufacturer s recommendation TIRE CHAINS Tire chains should be used whenever extra traction is needed OPERATING TIPS NOTE Allow the engine to warm up for a few minutes as the engine will not develop full power until it reac...

Page 10: ... mechanism at least once a season Use engine oil or a spray lubricant Avoid getting oil on rubber friction wheel and aluminum drive plate CHUTE DIRECTIONAL CONTROL WORM The worm gear on the chute directional crank should be greased with multi purpose automotive grease IMPELLER PULLEY The impeller pulley should be lubricated once a season Refer to exploded view of parts found in the back of the boo...

Page 11: ...lts are to the inside of the housing Tighten securely BELT REMOVAL AND REPLACEMENT WARNING Remove the spark plug wire from the spark plug and ground Drain gasoline from the fuel tank or place a piece of plastic film underneath the gas cap to prevent gasoline from leaking Auger Belt To remove and replace either the auger belt or the drive belt proceed with the following instructions 1 Disconnect ch...

Page 12: ...always be firmly seated in the pulley groove when the auger clutch lever is in the disengaged position Drive Belt 1 Unhook extension spring from the belt cover plate See Figure 18 2 Remove drive belt from the engine pulley and bottom drive pulley 3 Replace belt and reassemble in reverse order 4 Reassemble the two halves of the unit hooking the lower portion of the auger housing over the stationary...

Page 13: ... and slide the shaft through the friction wheel See Figure 23 9 Slide the hex shaft into the hex I D of the sprocket the spacer and the left ball bearing and secure with the bell washer and hex bolt NOTE Make sure the pin from the shift arm assembly is assembled to the new friction wheel assembly CAUTION Check engine and snow thrower frequently for loose nuts bolts etc and keep these items tighten...

Page 14: ... of power Spark plug wire loose Gas cap vent hole plugged Exhaust port plugged Connect and tighten spark plug wire Remove ice and snow from cap Be certain vent hole is clear Clean see Maintenance section of engine manual Engine overheats Carburetor not adjusted properly Refer to the engine manual packed with your unit or have carburetor adjusted by an authorized service dealer Excessive vibration ...

Page 15: ...ms Nut 1 4 20 1 4 725 1669 Lamp Lens Housing Ass y 1 629 0059 Halogen Light Wire Harness 1 725 1658 890 Halogen Bulb 1 6 710 0451 Carriage Bolt 5 16 18 x 75 1 7 710 1003 Pan Head B Tapp Screw 10 2 8 736 0159 Fl Wash 344 ID x 88 OD 1 9 712 0429 Hex Ins L Nut 5 16 18 1 10 731 1873A Handle Panel 1 11 735 0225 Grommet 38 ID x 50 OD x 12 1 12 705 5217 Lamp Mounting Bracket 1 ...

Page 16: ... 24 25 26 34 35 36 37 39 39 40 41 42 43 44 45 44 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 64 66 67 70 72 73 74 43 39 48 49 41 48 1 68 75 75 8 8 7 12 13 11 68 65 71 81 79 80 68 68 71 84 85 85 84 86 63 69 62 62 69 63 76 77 78 83 82 83 27 27 72 37 64 66 82 27 27 7 12 12 75 ...

Page 17: ...racket Chute Tilt 1 51 784 5604 Chute Tilt Handle 1 52 684 0053A Lower Chute Directional Control 1 53 710 3015 Hex Scr 1 4 20 x 75 Lg Gd5 1 54 712 0287 Hex Nut 1 4 20 1 55 720 0201A Chute Directional Control Knob 1 56 726 0100 Push Cap 3 8 Palnut 375011 1 57 736 0117 Flat Washer 38 ID x 60 OD x 033 1 58 736 0270 Bell Wash 26 ID x 75 OD x 06T 1 59 747 0624 Upper Chute Directional Control 1 60 705 5...

Page 18: ...18 Model 993 8 ...

Page 19: ... 73 736 0291 Flat Washer 88 ID x 1 4 OD x 125 3 74 717 0299 Worm Gear LH Double Thread 1 75 741 0670 Flange Brg 1 5 ID x 1 75 OD x 80 2 76 736 0266 Flat Washer 1 5 ID x 2 0 OD x 03 2 77 717 1425 Worm Gear LH Double Thread Bronze 1 78 738 0275 Worm Gear Shaft 1 79 714 0135 91 Woodruff Key 1 4 x 3 4 dia 1 80 719 0349 Gear Housing Half LH 1 81 710 1260A Hex Flange Scr 5 16 18 x 75 7 82 712 0429 Hex I...

Page 20: ...20 Model 993 ...

Page 21: ...Gr 5 1 16 712 0116 Hex Ins L nut 3 8 24 1 17 714 0118 Square Key 1 4 X 1 5 1 18 732 0303 Extension Spring 38 OD X 3 18 L 1 19 736 0169 L wash 3 8 1 20 736 0217 Lock Washer 3 8 Heavy 1 21 736 0242 Bell Wash 345 ID X 88 OD X 060 4 22 737 0157 Grease Sunaplex 781 1 10 1 23 738 0215A Shoulder Scr 498 Dia X 3 0 Lg 1 24 748 0234 Shldr Spcr 50 Dia X 14 Shldr 1 25 754 0131 3v Belt 35 5 Lg 1 26 756 0240 3 ...

Page 22: ... 13 50 14 15 78 16 17 17 1 19 20 12 23 22 22 22 23 24 24 25 26 27 28 71 29 34 34 32 32 33 33 34 35 36 36 37 38 39 38 38 76 47 47 50 19 48 49 49 49 49 50 51 51 52 53 53 54 54 55 80 80 56 53 53 58 57 57 59 60 61 61 62 62 63 64 65 66 67 68 68 69 70 28 72 73 74 75 19 47 56 82 81 ...

Page 23: ...ing 1 46 732 0209 Extension Spring 2 47 736 0119 Lock Washer 5 16 7 48 736 0158 Lock Washer 5 8 1 49 736 0160 Wash Fl 531 ID x 930 OD x 05 4 50 736 0163 Wash Fl 1 03 ID x 1 62 OD 4 51 736 0300 Wash Flt 1 4 ID x 930 OD x 12 2 52 736 0623 Wash Flt 640 ID x 1 24 OD x 06 1 53 736 0217 Lock Washer 3 8 Heavy 4 54 736 0242 Bell Wash 345 ID x 88 OD 2 55 736 0275 Fl wash Sae 34 x 68 062 1 56 736 0329 Lock ...

Page 24: ...arate manufacturer s warranty Please refer to the applicable manufacturer s warranty on these items b Routine maintenance items such as lubricants filters blade sharpening and tune ups or adjustments such as brake adjustments clutch adjustments or deck adjustments and normal deterioration of the exterior finish due to use or exposure c Log splitter pumps valves and cylinders have a sepa rate one y...

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