MTD 770-10278 993 User Manual
Perator’s, Anual
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)
Table of contents
Document Outline
- Model Series
- 993
- Snow Thrower
- SECTION 1: FINDING YOUR MODEL NUMBER
- This Operator’s Manual is an important part of your new snow thrower. It will help you assemble, ...
- Before you start to prepare your snow thrower for its first use, please locate the model plate an...
- Figure 1
- (4683)
- or
- 1- (800)-800-7310
- WARNING
- THIS SYMBOL POINTS OUT IMPORTANT SAFETY INSTRUCTIONS WHICH, IF NOT FOLLOWED, COULD ENDANGER THE P...
- The Engine Exhaust from this product contains chemicals known to the State of California to cause...
- Your snow thrower was built to be operated according to the rules for safe operation in this manu...
- 1. TRAINING
- 2. PREPARATION
- 3. OPERATION
- 4. MAINTENANCE AND STORAGE
- WARNING - YOUR RESPONSIBILITY
- Restrict the use of this power machine to persons who read, understand and follow the warnings an...
- Figure 2 Safety Labels Found on Snow Thrower
- AUGER SHEAR BOLTS
- NOTE
- IMPORTANT
- 1. Remove screws from the top sides and ends of the shipping crate.
- 2. Set top, side, and end panels aside to avoid tire punctures or personal injury.
- 3. Remove and discard plastic bag that covers unit.
- 4. Roll unit out of crate.
- 5. Remove the lower two plastic wing nuts, cupped washers and carriage bolts from each side of th...
- 6. The chute directional control may be attached to the lower handle with cable ties for shipping...
- 7. Raise the upper handle assembly until it locks over the lower handle. See Figure 3 and Figure 4.
- 8. Secure the upper handle and lower handle with the two plastic wing nuts, cupped washers and ca...
- 9. Slide the shift rod connector down over the end of the lower shift rod. See Figure 5. Tap the ...
- NOTE
- 10. Remove the hairpin clip from the end of the upper chute directional control. Slide the upper ...
- Figure 6
- 11. If not already attached, slip the cables that run from the handle panel to the chute into the...
- 12. Unwrap the headlight wire which is attached to the headlight, beneath the handle panel. Wind ...
- 13. Plug the wire from the headlight into the wire lead coming from the right side of the engine,...
- Figure 7
- Figure 8
- Figure 9
- FINAL ADJUSTMENTS
- Auger and Traction Control Clutch Adjustment
- If necessary, thread lock-nut up to increase tension or down to decrease tension. See Figure 7.
- Skid Shoe Adjustment (See Figure 8)
- Shift Lever Adjustment (See Figure 9)
- TIRE PRESSURE (Pneumatic Tires)
- NOTE
- SECTION 5: CONTROLS
- Figure 10
- SHIFT LEVER
- AUGER CONTROL (See Figure 10)
- TRACTION CONTROL/AUGER CLUTCH LOCK
- TRIGGER LEVERS (See Figure 10)
- CHUTE DIRECTIONAL CONTROL
- (See Figure 10)
- CHUTE TILT CONTROL (See Figure 10)
- HEADLIGHT (See Figure 10)
- THROTTLE CONTROL (See Figure 12)
- SAFETY IGNITION SWITCH (See Figure 12)
- FUEL SHUT-OFF VALVE
- SECTION 6: OPERATION
- NOTE
- GAS AND OIL FILL-UP
- WARNING
- TO START ENGINE
- IMPORTANT
- WARNING
- 1. Attach spark plug wire to spark plug. Make certain the metal loop on the end of the spark plug...
- 2. Make certain the auger and traction control clutch levers are in the disengaged (released) pos...
- 3. Move throttle control up to FAST position. Insert ignition key into slot. Refer to Figure 12. ...
- 4. Rotate choke knob to OFF position.
- Figure 13
- Figure 14
- 5. Connect power cord to switch box on engine. Plug the other end of power cord into a three- hol...
- 6. Push starter button to crank engine. Refer to Figure 12. As you crank the engine, move choke k...
- 7. When engine starts, release starter button, and move choke gradually to OFF. If engine falters...
- 1. From the starting instructions for an Electric starter, follow step 1 through step 3.
- 2. Rotate choke knob to FULL choke position (cold engine start). If engine is warm, place choke i...
- 3. Push primer button two or three times. Refer to Figure 12. If engine is warm, push primer butt...
- NOTE
- 4. Grasp starter handle (refer to Figure 12) and pull rope out slowly, until it pulls slightly ha...
- 5. Pull starter handle rapidly. Do not allow handle to snap back. Allow it to rewind slowly while...
- 6. Repeat step 4 and step 5 until engine starts.
- 7. As engine warms up and begins to operate evenly, rotate choke knob slowly to OFF position. If ...
- TO STOP ENGINE
- NOTE
- TO ENGAGE DRIVE
- 1. With the engine running near top speed, move shift lever into one of the six FORWARD positions...
- 2. Squeeze the left hand auger clutch grip and engage it.
- 3. While the left hand auger clutch grip is engaged, engage the right hand traction control clutc...
- 4. Release the left hand auger clutch grip only. The interlock mechanism should keep the left han...
- NOTE
- TIRE PRESSURE
- TIRE CHAINS
- OPERATING TIPS
- NOTE
- WARNING
- 1. For most efficient snow removal, remove snow immediately after it falls.
- 2. Discharge snow downwind whenever possible. The distance snow is thrown can be adjusted by adju...
- 3. Set the skid shoes 1/4” below the shave plate for normal usage. The skid shoes may be adjusted...
- 4. Be certain to follow the precautions listed under previous section, “To Stop Engine” to preven...
- 5. Clean the snow thrower thoroughly after each use.
- SECTION 7: ADJUSTMENTS
- SECTION 8: LUBRICATION
- SECTION 9: MAINTENANCE
- WARNING
- AUGERS
- SHAVE PLATE AND SKID SHOES
- NOTE
- BELT REMOVAL AND REPLACEMENT
- WARNING
- Auger Belt
- NOTE
- 4. Remove the cotter pin and washer from the ferrule in order to disconnect the auger idler rod f...
- 5. Slip the auger control belt (the front belt) off the engine pulley. Refer to Figure 19.
- 6. Pull the brake bracket assembly towards the cable guide roller and unhook the auger cable “Z” ...
- 7. Remove the top screws and lock washers which attach the auger housing assembly to the frame as...
- Figure 18
- Figure 19
- Figure 20
- 8. Separate the auger housing from the frame assembly by tilting the housing forward and pulling ...
- 9. Using a 1/2” wrench remove the hex screw and belleville washer from the centre of the pulley o...
- 10. Remove and replace auger belt inside belt keepers.
- 11. Reassemble pulley to auger housing with hex screw and belleville washer (cupped is toward the...
- Figure 21
- NOTE
- 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 ...
- 5. Secure the two halves with the two screws and lock washers
- 6. Attach the “Z” fitting of the cable into the brake bracket assembly. See Figure 19.
- 7. Slip the auger control belt over engine pulley.
- 8. Insert ferrule on auger idler rod into bracket assembly and secure with flat washer and cotter...
- 9. Reassemble the large shoulder bolt and lock washer as shown in Figure 18.
- 10. Reassemble belt cover and chute directional control.
- 11. Remove plastic film from gas cap.
- Changing the Friction Wheel
- 1. Drain the gasoline from the snow thrower, or place a piece of plastic under the gas cap.
- 2. Tip the snow thrower up and forward, so that it rests on the housing.
- 3. Remove six self-tapping screws from the frame cover underneath the snow thrower.
- 4. Remove the wheels from the axle.
- 5. Using a 7/8” wrench hold the hex shaft and remove the hex bolts and cupped washer and bearing ...
- 6. Remove the six screws from the friction wheel assembly (three from each side).
- 7. Reassemble new bonded friction wheel rubber to the friction wheel assembly, tighten the six sc...
- Figure 22
- Figure 23
- NOTE
- CAUTION
- SECTION 10: OFF-SEASON STORAGE
- SECTION 11: TROUBLE SHOOTING GUIDE
- SECTION 12: Illustrated Parts
- Model 993
- Model 993
- Model 993
- Model 993
- Model 993
- Model 993
- Model 993
- Model 993
- Model 993