Transcript
Service Manual
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 publication are for reference use only and may not depict actual model and component parts. © Copyright 2005 MTD Products Inc. All Rights Reserved
MTD Products LLC - Product Training and Education Department FORM NUMBER 769-01417 9/2004
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 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.
31AS250-700
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.
SNOW-THROWER MODEL 31AS250-700 SERIAL # 1E074B20022
Perimeter Screws
GENERAL INFORMATION •
Single Stage snow thrower
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4.5 horsepower Tecumseh HSK Air Cooled Two cycle engine with Electric Start
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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 classified oil is recommended. A 32:1 fuel mix is recommended if NMMA oil is not available.
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.
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.
1.2.
WARNING: Before servicing, repair, 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 unintended starting. NOTE: Some procedures require you to tip the snow thrower up on the front of the auger housing. If there is fuel in the gas tank, place a piece
1
Loosen or remove the ball bearing idler using a 7/16 socket and ratchet wrench. Notice the position of the outer washer or belt retainer; the flat side should be facing up, to allow clearance
ment cable can be checked for damage and operation.
inside the belt cover. Inspect the bearing for wear or damage.
Return Spring
Auger Pulley Idler Arm Idler Pulley
Idler Arm
Auger Engagement Cable and Spring
Auger Belt Engine Drive Pulley
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.
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.
Brakes shoe stamped into idler arm
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.
1.4.
Re-install in reverse order. NOTE: The Idler arm return springs can be checked for proper tension and also the engage-
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Use a long blade screwdriver to access the latches.
2.3.
Using a long blade screwdriver release the upper and lower latch.
and turned around.
VIEW FROM BEHIND UNIT UNDER COWLING
Latches Shave Plate
3.
FLAIL REPLACEMENT
3.1.
Lay the snow-thrower back on the handles to allow access to the rubber flails.
5.
AUGER REMOVAL
5.1.
Using a 1” socket, remove the auger pulley. This is a left hand threaded nut. Remove clockwise.
Rubber Flails
Auger Pulley
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
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5.2.
ing and thereby pushing out the bearing and bearing backup washer out the left side.
Remove the bearing housing screws using a 3/8” socket. LEFT SIDE
Bearing Housing Cover
Slider the auger to left pushes out bearing
5.3.
The auger can now be inspected for wear and or breakage of welds. If not damaged, replace in reverse order.
Remove the auger bolt on the right side of the housing using a 7/16” socket and ratchet. RIDE SIDE
Auger Bolt
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-
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6.
SHROUD COVER REMOVAL
6.1.
Remove the upper chute and the chute handle from the lower chute.
6.2.
Using a 3/8” socket remove the three screws securing the front of the housing to the auger housing.
Shroud Screws
6.3.
Remove the four bolts (two on each side) securing 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
5
