Troy-bilt FS55 TB 4920CC User Manual

Service Manual

TROY-BILT CHAIN SAW - MODEL FS55 TB 4920CC

NOTE: These materials are for use by trained technicians 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 use 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 769-01423

9/2004

	Table of Contents
General Information ..............................................................................................	1
Air Filter ................................................................................................................	1
Fuel Filter .............................................................................................................	2
Chain Oil Filter ......................................................................................................	2
Spark Arrester Screen ..........................................................................................	3
Spark Plug ...........................................................................................................	4
Bar and Chain Removal .......................................................................................	5
Clutch Removal ....................................................................................................	5
Chain Oiler Removal ............................................................................................	6
Starter Assembly Removal ...................................................................................	8
Servicing the Spring Assist Starter .......................................................................	8
Flywheel Removal ................................................................................................	9
Handle Removal .................................................................................................	10
Carburetor Adjustment .......................................................................................	12
Carburetor Removal ...........................................................................................	12

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Troy-Bilt Chain Saw

Model FS55 - TB4920CC

TROY-BILT CHAIN SAW - MODEL FS55 TB 4920CC	cedures for proper setup and operation.
		IMPORTANT: Prior to servicing the chain saw,
		remove the spark plug wire from the spark plug.
		WARNING: Never perform maintenance when
		the engine is hot, to avoid any chance of burning
		hands or fingers.
	1.	AIR FILTER
	1.1.	Using a T-25 Torx Driver, loosen the cover
		retaining screws. Lift off the cover. See Figure 1.

GENERAL INFORMATION

•55cc Displacement - Family 4MHXS.0555AA EM

•The Troy-Bilt models are all AV - Anti-Vibration.

•This engine conforms to 2004 U.S. EPA PH 2 Emission Regulations.

•20” Blade w/ INTENZ by Oregon. Incorporates chain tension adjustment on the blade bar. Bar # 9040-31B203

•Chain # 9220-31B203 (20”-78DL)

THIS SAW FEATURES OUR SPRING ASSIST STARTING SYSTEM.

•The system allows the customer to pull the recoil rope at any pace they please, yet still generate enough force to start the engine.

•The system is simple; it consists of a recoil pulley assembly, which includes an accumulator spring. As the rope is pulled, the accumulator spring winds up. When the force on the accumulator spring over-comes the engine compression, it releases its accumulated energy, spinning the crankshaft rapidly.

This Service Manual is a supplement to the Operator’s Manual. Read, understand and follow all safety procedures before operating or servicing this chain saw. Refer to the Owners Manual for pro-

Cover Screws

Figure 1

1.2.Remove the air filter. See Figure 2.

Filter

Figure 2

1

1.3.Wash filter in clean, warm, soapy water. Rinse in clear, cool water. Air dry completely. See Figure 3.

Figure 3

NOTE: It is advisable to have a supply of spare filters.

1.4.Install air filter.

1.5.Install engine / air filter cover. Make sure cover fits properly.

1.6.Tighten the cover retaining screws securely.

2.FUEL FILTER

2.1.Remove air box cover and air filter.

2.2.Disconnect fuel hose from the carburetor fitting.

NOTE: You may not need to disconnect the fuel hose to gain access to the filter.

2.3.Pull fuel filter out of tank with a bent wire or long needle nosed pliers. See Figure 4.

Fuel Filter

Figure 4

2.4.Disconnect filter and discard.

NOTE: Do not pull hose completely out of tank.

2.5.Install a new fuel filter on hose and pull hose/filter assembly back into tank so filter is positioned in front right corner.

2.6.Reconnect fuel hose to carburetor fitting.

2.7.Replace air filter and air box cover.

3.CHAIN OIL FILTER

NOTE: If the chain oiler fails to work properly, the cause may be a clogged filter. Drain oil tank before changing filter.

NOTE: Make sure you have a new filter and a length of hose before beginning this procedure.

3.1.Using a T-25 Torx driver, remove the two screws securing the lower heat shield to the crankcase. See Figure 5.

Torx Screws

Figure 5

2