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Stihl TS 420 User Manual

Stihl TS 420
106 pages
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STIH)
STIHL TS 410, 420
2007-09

Table of Contents

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Stihl TS 420 Specifications

General IconGeneral
Engine Power4.4 bhp
Weight21.2 lbs
Arbor Size20 mm
Maximum Wheel Size350 mm
Maximum Cutting Depth125 mm
Displacement66.7 cc (4.1 cu. in.)
Fuel Capacity710 cc

Summary

1. Introduction

2. Safety precautions

3. Specifications

3.1 Shortblock

Details the engine's basic specifications including displacement, bore, and stroke.

3.2 Fuel system

Lists specifications for the fuel system, including leakage test parameters.

3.3 Ignition system

Specifies ignition system parameters such as air gap and spark plug type.

3.4 Cutting wheels

Provides specifications for cutting wheels, including diameter and cutting depth.

3.5 Tightening torques

4. Troubleshooting

4.1 Clutch

Addresses common problems with the clutch system and provides solutions.

4.2 Cast arm with guard

4.3 Rewind starter

4.4 Ignition system

4.5 Carburetor

4.6 Engine

5. Cast arm with guard

5.1 Water system

Explains the procedure for servicing the water system components.

5.2 Cast arm with guard

5.3 Testing radial and axial truth of running

5.4 Test sequence

5.5 Ribbed poly V-belt

5.6 Tensioner

5.7 Starter cup

6. Clutch

6.1 Belt pulley/clutch drum

6.2 Studs for securing the cast arm with guard

7. Shortblock

7.1 Muffler/spark arresting screen

Covers the removal, cleaning, and installation of the muffler and spark arresting screen.

7.2 Leak testing

7.2.1 Preparatory steps

Outlines the necessary preparations before performing leak testing on the shortblock.

7.2.2 Vacuum test

Details the procedure for conducting a vacuum test to detect leaks.

7.2.3 Pressure test

7.3 Oil seals

7.4 Removing and installing the shroud

7.5 Cylinder

7.6 Crankshaft

7.6.1 Removal and installation

Details the complete process for removing and installing the crankshaft.

7.6.2 Grooved ball bearing/crankcase

Ignition-side half of the crankcase

Covers the removal and fitting of the ignition-side crankcase half and associated bearings.

Clutch-side half of the crankcase

7.7 Piston

7.7.1 Removal

Explains how to remove the piston from the connecting rod, including snap ring removal.

7.7.2 Installation

7.8 Piston rings

7.9 Decompression valve

8. Ignition system

8.1 Ignition module

Describes the ignition module's components and basic function.

8.1.1 Removal and installation

8.2 Ignition timing

8.3 Testing the ignition module

8.4 Spark plug boot

8.5 Flywheel

8.6 Short circuit wire/switch

8.6.1 Testing

Describes how to test the continuity and function of the short circuit wire and switch.

8.6.2 Removal and installation

8.7 Troubleshooting, ignition system

9. Rewind starter

9.1 General

Discusses common issues and general maintenance for the rewind starter.

9.2 Removal and installation

Details the steps for removing and reinstalling the rewind starter cover and components.

9.3 Pawl

Covers the removal and installation of the pawl within the rewind starter.

9.4 Rope rotor

9.5 Starter rope/starter grip

9.6 Tensioning the rewind spring

9.7 Replacing the rewind spring

10. Repairing the AV system

10.1 AV spring on the handlebar

Explains how to remove and install the AV spring located on the handlebar.

10.2 AV spring in the support

10.3 AV spring at the bottom of the crankcase

10.4 AV spring on the carburetor

10.5 Handlebar

10.6 Rubber buffers/support

Support

Covers the removal and installation of the support component.

Support foot

Explains how to remove and reinstall the support foot.

11. Actuating levers

11.1 Switch shaft/choke lever

Describes the function and operation of the switch shaft and choke lever.

11.1.1 Switch shaft, removal and installation

11.2 Throttle trigger/trigger interlock, removal and installation

11.2.1 Choke lever/holder, removal and installation

12. Fuel system

12.1 Air filter

Explains how to check and replace the air filter for optimal engine performance.

12.2 Carburetor, removal and installation

Guides on the complete process for removing and reinstalling the carburetor.

12.2.1 Leakage testing

12.3 Repairing the carburetor

12.3.1 Metering diaphragm

Covers the removal, inspection, and replacement of the carburetor's metering diaphragm.

12.3.2 Inlet needle

12.3.3 Fixed jet

12.3.4 Pump diaphragm

12.3.5 Air valve

12.3.6 Choke shaft/choke shutter

12.3.7 Throttle shaft/throttle shutter

12.3.8 Adjusting screws

12.4 Carburetor adjustment

12.4.1 Basic setting

Outlines the procedure for setting the basic adjustment of the carburetor.

12.4.2 Standard setting

12.5 Choke rod and throttle rod

Choke rod

Covers the removal and installation of the choke rod.

Throttle rod

Details the process for removing and installing the throttle rod.

12.6 Intake elbow, removal and installation

12.6.1 Impulse hose

12.7 Tank vent

12.7.1 Testing

Describes methods for testing the tank vent for proper functionality.

12.7.2 Removal and installation

12.7.3 Manual fuel pump

12.8 Fuel Intake

12.8.1 Pickup body

Explains how to check and clean the fuel pickup body to ensure proper fuel supply.

12.8.2 Fuel hoses

12.8.3 Fuel tank filler cap

12.9 Tank housing, removal and installation

13. Special tools

New special tools

Lists special tools that are newly introduced for servicing.

Existing special tools

Lists special tools that are currently available for maintenance.

14. Servicing accessories

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