MTD 31AS250-700 User manual

Brand: MTD

Model: 31AS250-700

Category: Snow throwers

Type: User manual

Service Manual

MTD Products LLC - Product Training and Education Department

FORM NUMBER 769-01417

9/2004

31AS250-700 Snow Thrower

NOTE: These materials are for use by trained technicians who are experienced in the service and repair of outdoor power 

equipment of the kind described in this publication, and are not intended for use by untrained or inexperienced individuals. 

These materials are intended to provide supplemental information to assist the trained technician. Untrained or inexperienced 

individuals should seek the assistance of an experienced and trained professional. Read, understand, and follow all 

instructions and common sense when working on power equipment. This includes the contents 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 

from time to time. Therefore, it may be necessary to obtain the latest materials before servicing or repairing a product. The 

company reserves the right to make changes at any time to this publication without prior notice and without incurring an 

obligation to make such changes to previously published versions. Instructions, photographs and illustrations used in this 

TABLE OF CONTENTS

General Information ....................................................................................................1

Drive Belt Removal .....................................................................................................1

Chute Removal ...........................................................................................................2

Flail Replacement .......................................................................................................3

Shave Plate Servicing ................................................................................................3

Auger Removal ...........................................................................................................3

Shroud Cover Removal ..............................................................................................4

Engine Removal .........................................................................................................5

Fuel Tank Removal ....................................................................................................5

31AS250-700

SNOW-THROWER MODEL 31AS250-700 SERIAL #

1E074B20022

GENERAL INFORMATION

• Single Stage snow thrower

• 4.5 horsepower Tecumseh HSK Air Cooled Two

cycle engine with Electric Start

• To operate you need to use a clean, high quality,

2-cycle oil mixed at a ratio of 50:1. Use if NMMA,

TC-Wll or TC-W3, JASO FB or FASO FC classi-

fied oil is recommended. A 32:1 fuel mix is rec-

ommended if NMMA oil is not available.

NOTE: These materials are prepared for use by

trained technicians who are experienced in the

service and repair of this type of equipment

described in this publication, and are not

intended for use by untrained or inexperienced

individuals. All such individuals should seek the

assistance of an authorized service dealer.

WARNING: Before servicing, repair, or inspect-

ing, disengage all clutch levers and stop engine.

Wait until all moving parts have come to a com-

plete 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 opening and

screw the cap back on the tank tightly. This

should keep the gas from leaking out of the cap

or vent.

During the service of this Snow Thrower there is no

reason to remove the wheel assemblies, other than

complete wheel replacement. The push cap on the

wheels must be replaced when removed.

1. DRIVE BELT REMOVAL

1.1. Remove the (5) screws using a 3/8 socket and

ratchet wrench from the perimeter of the belt

cover and remove the cover for access to the

belt drive assembly.

NOTE: The front screw is shorter than the other

four and is a fine thread. It is necessary that this

screw be used to allow for clearance to the

auger assembly.

1.2. Loosen or remove the ball bearing idler using a

7/16 socket and ratchet wrench. Notice the posi-

tion of the outer washer or belt retainer; the flat

side should be facing up, to allow clearance

Perimeter Screws

31AS250-700 Snow Thrower

inside the belt cover. Inspect the bearing for

wear or damage.

1.3. Pressing down on the idler bracket will allow the

brake shoe to lift off the belt and out of the pulley

area to easily roll the belt off the auger pulley

and the engine drive pulley.

1.4. Re-install in reverse order.

NOTE: The Idler arm return springs can be

checked for proper tension and also the engage-

ment cable can be checked for damage and

operation.

2. CHUTE REMOVAL

For replacement of the directional chute, latches must

be opened to remove the chute clamp. Access to the

latches can be gained from the inside rear opening.

NOTE: Removal of the chute is easier than it is

to reinstall. If the shroud cover is to be removed,

it is easier to disassemble the handle and upper

chute and place the clamp on the lower chute

prior to installing the shroud cover.

2.1. Position the chute facing forward and the latches

of the chute will be exposed.

NOTE: There is an upper and a lower latch on

the directional chute clamp.

2.2. Use a long blade screwdriver to access the latches.

Auger Pulley Idler Arm Idler Pulley

Auger Belt Engine Drive Pulley

Brakes shoe stamped into idler arm

Idler Arm

Auger Engagement

Return Spring

Cable and Spring

2.3. Using a long blade screwdriver release the

upper and lower latch.

3. FLAIL REPLACEMENT

3.1. Lay the snow-thrower back on the handles to

allow access to the rubber flails.

3.2. Remove the self tapping hex screws attaching

the rubbers flails to the auger assembly.

3.3. Attach new flails in reverse order.

4. SHAVE PLATE SERVICING

The plastic shave plate can also be removed if worn

VIEW FROM BEHIND UNIT UNDER COWLING

Latches

Rubber Flails

and turned around.

5. AUGER REMOVAL

5.1. Using a 1” socket, remove the auger pulley.

This is a left hand threaded nut. Remove clockwise.

Shave Plate

Auger Pulley

5.2. Remove the bearing housing screws using a

3/8” socket.

5.3. Remove the auger bolt on the right side of the

housing using a 7/16” socket and ratchet.

5.4. Using a drift punch or 3/8” 6” extension tap on

the end of the auger shaft from the right side,

driving the axle shaft out of the right hand bear-

ing and thereby pushing out the bearing and

bearing backup washer out the left side.

The auger can now be inspected for wear and or

breakage of welds. If not damaged, replace in reverse

order.

6. SHROUD COVER REMOVAL

6.1. Remove the upper chute and the chute handle

from the lower chute.

Bearing Housing Cover

LEFT SIDE

RIDE SIDE

Auger Bolt

Slider the auger to left pushes out bearing

6.2. Using a 3/8” socket remove the three screws

securing the front of the housing to the auger

housing.

6.3. Remove the four bolts (two on each side) secur-

ing the sides of the shroud cover housing to the

sides of the auger housing.

6.4. MORE INSTRUCTIONS TO COME

7. ENGINE REMOVAL

8. FUEL TANK REMOVAL

Shroud Screws

MTD 31AS250-700 User manual

Brand: MTD

Model: 31AS250-700

Category: Snow throwers

Type: User manual

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MTD 31AS250-700 User manual

MTD 31AS250-700 User manual

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