MTD 31AS2B5 Manuale utente

Service Manual

MTD Products LLC - Product Training and Education Department

FORM NUMBER 769-01416

9/2004

31AS2B5 Snow Thrower

IMAGE SHOWS YARD-MAN UNIT

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 publication are for reference 

TABLE OF CONTENTS

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

Controls ..................................................................................................................... 1

Auger ......................................................................................................................... 1

A/C Starter ................................................................................................................. 1

Back of Unit ............................................................................................................... 2

Muffler ....................................................................................................................... 2

Shave Plate ............................................................................................................... 2

Discharge Chute ........................................................................................................ 3

Auger Drive Belt Replacement ................................................................................. 3

Auger Removal ......................................................................................................... 4

Spark Plug Access .................................................................................................... 5

Front Shroud Cover Removal ................................................................................... 6

Engine Removal ....................................................................................................... 8

Gas Tank ................................................................................................................... 9

31AS2B5-711

Snow Thrower Model Number #31AS2B5- 711 Serial

Number 1E074B20005

NOTE: The equipment that was used to write

this section was a prototype and was without

labels. There may be subtle differences between

prototypes and production equipment but the

disassembly procedures preformed will remain

the same.

GENERAL INFORMATION

Tecumseh Engine HSSK 50 designated as a (C)

engine with 125 hours life expectancy. Oil recommen-

dation is 5W30 - Sump capacity is 21 ounces

This is a four-cycle, horizontal crankshaft, air-cooled

engine equipped with a 120 V A.C. operated electric

starter.

NOTE: Refer to the engine manual for start and

stop and maintenance procedures.

Yard-Man Version

1. CONTROLS

The auger control bail and the pull start handle are

mounted on the main handle for easy accessibility. The

pull rope and mitten-grip handle is secured to the right

handle with a bracket to keep the cord away from other

items and allow for direct and easy in line pull. See Fig-

ure 1.

2. AUGER

The auger assembly is also easily accessible for main-

tenance and periodical replacement of the rubber flails

on the auger assemblies. See Figure 2.

3. A/C STARTER

From the rear there is easy access to the start/stop

Figure 1

Control Bail

Pull Start

Figure 2

Rubber Flails

31AS2B5-711 Snow Thrower

switch and the A.C. plug connector with starter button

that is used for the electric start. See Figure 3.

4. BACK OF UNIT

The Model tag is located on the back of the unit and

includes phone numbers for customer assistance:

Troy- Bilt 330-558-5520 or 1-800-520-5520. The choke

control is shown on the right side of the carburetor

cover. To the right shows the gas tank location. See

Figure 4.

5. MUFFLER

View showing the muffler and pipe at top left. See Fig-

ure 5.

NOTE: Unit is tipped up on the auger housing to

view carburetor and the carburetor bowl drain for

removal of bad gas or water from the bowl/float

area.

6. SHAVE PLATE

The adjustable shave plate can be turned around when

worn on one side. See Figure 6.

Figure 3

Key Switch

110 A/C Plug

Figure 4

Choke Control

Gas Tank

Model Plate

Figure 5

Muffler Tailpipe

Float Bowl Drain

Figure 6

Reversable Shave Plate

7. DISCHARGE CHUTE

The mitten grip handle on the snow chute allows easy

adjustment side to side. See Figure 7.

8. AUGER DRIVE BELT REPLACEMENT

8.1. Remove the five (5) screws on the perimeter of

the belt cover using a 3/8" socket with short

extension and ratchet. See Figure 8.

8.2. With the cover removed inspect for wear on the

belt and movement of the idler bracket. See Fig-

ure 8.

Figure 7

Figure 8

Perimeter Screws

8.3. Inspect the idler bracket tension and return

springs and note location of connections. See

Figure 9.

8.4. Using a 7/16" socket and a 7/16” box wrench,

remove the bolt securing the idler to the idler

arm. Inspect the idler bearing for freedom of

movement. Upon replacement note the position

of the larger retaining washer that has the top

position cut flat to clear the belt cover. See Fig-

ure 10.

8.5. Push down on the idler bracket to lift the belt

brake shoe away from the belt. The belt can then

be lifted out of the auger pulley and off the

Figure 9

Tension Spring

Return Spring

Figure 10

Belt Retaining Washer

engine pulley. Replace by using the same proce-

dure. See Figure 11.

9. AUGER REMOVAL

9.1. Place a two by four wedge in the housing to hold

the auger from turning. Using 1” socket, remove

the auger pulley nut. The shaft is reverse

threaded and the nut is removed by turning it

clockwise. See Figure 12.

NOTE: During reassembly place the 2X4 at the

base of the housing center and tighten in the

opposite direction.

9.2. Remove the pulley. See Figure 13.

9.3. Using a 3/8” socket, remove the three retaining

screws securing the bearing retainer housing to

the auger housing. See Figure 14.

Figure 11

Brake Shoe

Pull down on idler arm

Figure 12

2x4 Wedge

Figure 13

Figure 14

Bearing Retainer Housing

9.4. Remove and inspect the bearing and heavy

washer for ear or damage. See Figure 15.

9.5. Facing the housing, slide the auger assembly to

the right, and then remove the auger and shaft

assembly from the housing. See Figure 16.

Figure 15

Bearing and Washer

Figure 16

Slide auger assembly to the right

9.6. Inspect the auger assembly for wear on the rub-

ber flails. Check the shaft for straitness. Check

the welds for cracks or breaks. See Figure 17.

10. SPARK PLUG ACCESS

Access to the spark-plug is through an access hole on

top of the main housing next to the oil fill tube. See Fig-

ure 18.

Figure 17

Figure 18

Spark Plug

Access Hole

11. FRONT SHROUD COVER REMOVAL

11.1. Remove the three screws from the inside top of

the auger housing using a 3/8" socket and

ratchet. See Figure 19.

11.2. Remove the remaining five ( 5 ) perimeter

screws and two ( 2 ) screws holding the starter

plug assembly using a 5/16" socket. The shroud

is slotted to allow the removal from around the

starter cord. See Figure 20.

11.3. Remove the handle from the directional chute by

releasing the front tabs on the handle assembly

from the front opening of the chute and slide the

handle out of the chute assembly. See Figure

21.

11.4. Remove the directional deflector from the chute

assembly and you will be able to lift the shroud

over the lower chute. See Figure 21.

NOTE: This picture also shows releasing the tab

on the chute-retaining ring using a long blade

screwdriver. This would be necessary to remove

the chute retaining ring.

11.5. Removing the chute-retaining ring requires

releasing a lower tab from under the housing.

See Figure 22.

NOTE: This is somewhat difficult. If the lower

chute is not being replaced, it makes reassem-

Figure 19

Cover Screws

Figure 20

Figure 21

Front Tab

Directional Deflector

Upper Retaining Ring Tab

Figure 22

Lower Retaining Ring Tab

Indice

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