MTD 380 Service Manual Download

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Model 380 Two Stage Snow Thrower

9.3.

Remove the tension spring attached to the frame
and transmission. See Figure 9.3.

9.4.

Remove the belt from around the transmission
pulley.

9.5.

Tip the transmission forward. Using a pair of
needle nose pliers, squeeze the tabs on the
drive cable where it attaches to the transmission
and remove the cable from the bracket. See Fig-
ure 9.5.

9.6.

Remove the drive cable Z fitting from the trans-
mission housing.

Figure 9.3

Extension Spring

Transmission

Transmission Pulley

Figure 9.5

Drive Cable Tabs

Drive Cable Spring

Pliers

9.7.

Remove the cotter pins and flat washers secur-
ing the transmission mounting axle to the drive
housing. See Figure 9.7.

9.8.

Move the transmission to the left and to the right
and pivot it from the drive housing.

9.9.

Remove the two hex flange bearings from the
drive housing.

NOTE:

The transmission is not serviceable. The

transmission must be returned to the factory
unopened for warranty reimbursement.

NOTE:

The pinion gear and roll pin are service-

able.

10.

AUGER PULLEY REMOVAL

NOTE:

In order to ease removal of the auger

pulley it is recommended that you remove the
transmission first. See transmission removal
section for instructions.

Figure 9.7

Cotter Pins and Flat Washers

Summary of Contents for 380

Page 1: ... of the product s Operators Manual supplied with the equipment No liability can be accepted for any inaccuracies or omission in this publication although care has been taken to make it as complete and accurate as possible at the time of publication However due to the variety of outdoor power equipment and continuing product changes that occur over time updates will be made to these instructions fr...

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Page 3: ...l 4 Drive Axle Removal 4 Transmission Removal 4 Auger Pulley Removal 5 Auger and Impeller Removal 6 Spiral Assembly Removal 7 Impeller Removal 8 Reducer Transmission 8 Reduction Transmission Disassembly 8 Auger Cable Replacement 9 Directional Discharge Chute Assembly Removal 10 Removal of the Auger Idler Bracket 10 Engine Pulleys 11 Carburetor Bowl Drain 11 Table of Contents TOPIC PAGE ...

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Page 5: ...ing 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 unin tended starting NOTE Some procedures require you to tip the snow thrower up on the front of the auger hous ing If there is fuel in the gas tank place a piece of plastic wrap over the gas tank ope...

Page 6: ... washers and hex nuts which attach shave plate to the snow thrower housing See Figure 1 1 3 2 Reassemble new shave plate making sure heads of the carriage bolts are to the inside of the housing reinstall skid shoes and tighten securely 4 BELT REMOVAL AND REPLACEMENT NOTE There are two belts on the unit the auger belt and the drive belt It is recommended that you replace both belts at the same time...

Page 7: ...o the spiral shaft with two shear bolts and hex lock nuts If you hit a for eign object or ice jam the snow thrower is designed so that the bolts may shear If the augers do not turn check if the bolts have sheared Two replacement shear bolts and hex lock nuts have been provided with the snow thrower NOTE NEVER replace the auger shear bolts with standard hex bolts Any damage to the auger gearbox or ...

Page 8: ...orrode 8 DRIVE AXLE REMOVAL 8 1 Remove the wheels as described in section 7 8 2 Remove the cotter pin and clevis pin securing the 70T gear to the axle shaft See Figure 8 2 8 3 Slide the axle from the drive housing as you remove the gear from the axle shaft 8 4 Remove the hex flange bearings from the drive housing 9 TRANSMISSION REMOVAL 9 1 Tip the unit up and forward on the auger hous ing 9 2 Remo...

Page 9: ...rive Cable Tabs Drive Cable Spring Pliers 9 7 Remove the cotter pins and flat washers secur ing the transmission mounting axle to the drive housing See Figure 9 7 9 8 Move the transmission to the left and to the right and pivot it from the drive housing 9 9 Remove the two hex flange bearings from the drive housing NOTE The transmission is not serviceable The transmission must be returned to the fa...

Page 10: ...11 2 Remove the Transmission Refer to Section 9 11 3 Remove the Auger Pulley Refer to Section 10 11 4 Using a 1 2 socket remove the three hex nuts and lock washers securing the bearing housing to the auger housing Set the bearing housing aside See Figure 11 4 NOTE The order of parts in this group are bear ing housing bearing shim and spacer 11 5 Tip the unit back and down so it rests on the drive ...

Page 11: ...d Bearing Housing Figure 11 9 Shim and Spacer on Worm Shaft 12 SPIRAL ASSEMBLY REMOVAL 12 1 Remove the auger and impeller assembly from the housing Refer to Section 11 12 2 Using a 1 2 socket and a box end wrench remove the hex lock nut and shear bolt from the spiral assembly and auger drive shaft See Fig ure 12 2 12 3 Slide the spiral augers off the shaft and mark the spiral for left or right sid...

Page 12: ... pin See Figure 13 4 13 5 Remove the impeller from the worm shaft 14 REDUCER TRANSMISSION 14 1 The reducer can be serviced It can also be pur chased as an assembly See Figure 14 1 NOTE On the top of the gearbox is inspection and access hole for adding grease when and if required Remove the rubber grommet from the lubrication port 15 REDUCTION TRANSMISSION DISASSEMBLY 15 1 Using a 3 8 socket remove...

Page 13: ...acket on the left hand drive housing See Fig ure 16 1 Figure 15 3 Ultra Gray Figure 16 1 Hex Nuts Auger Control Cable 16 2 Spin the inner nut off the end of the control cable and slide the cable out of the bracket 16 3 Remove the spring from the auger bracket 16 4 Using a inch socket and a inch box wrench loosen the hex nut securing the cable bracket to the left hand handle bar See Figure 16 4 16 ...

Page 14: ...lar 17 5 Lift off the discharge chute NOTE During assembly make sure to position the collar into the detent spring Take time to fit upper and lower flanges on the collar around the chute flanges This will fit without forcing 18 REMOVAL OF THE AUGER IDLER BRACKET 18 1 Remove the belts as described in Section 4 18 2 Remove the wheels as described in Section 7 18 3 Remove the transmission as describe...

Page 15: ...8 7 Disconnect the extension spring from the idler to the housing 18 8 Remove the Idler bracket Figure 18 6 Shoulder Screw Flange Lock Nut on underside of housing 19 ENGINE PULLEYS NOTE If there is reason to disassemble the engine pulleys pay attention to the shape and orientation of the pulleys and spacers for reas sembly 20 CARBURETOR BOWL DRAIN This model has a spring loaded drain for the float...

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