Husqvarna Chainsaw Workshop Manual 340,345,346XP,350,351,353.pdf

340 345 346XP

350 351 353

English

Workshop manual

Workshop manual

Husqvarna 340/345/346XP/350/351/353

Contents

Introduction ........................................................... 2

Safety regulations ................................................. 3

General instructions ........................................... 3

Special instructions ............................................ 3

Special tools .......................................................... 4

Technical data ....................................................... 6

Construction and function ................................... 8

Carburettor ......................................................... 8

Troubleshooting .................................................. 10

Repair instructions ............................................. 12

Chain brake ...................................................... 12

Silencer ............................................................ 14

Chain catcher ................................................... 14

Stop switch ....................................................... 15

Stop switch – resistance measurement ........... 15

Choke control ................................................... 16

Throttle trigger .................................................. 17

Hand grip heater .............................................. 18

Starter assembly .............................................. 21

Starter cord ...................................................... 21

Recoil spring .................................................... 22

Ignition module – testing .................................. 23

Ignition module and flywheel ............................ 23

Generator ......................................................... 24

Centrifugal clutch ............................................. 26

Oil pump ........................................................... 27

Carburettor ....................................................... 30

Carburettor – pressure testing ......................... 33

Carburettor heater ............................................ 34

Air intake system .............................................. 35

Carburettor – adjustment ................................. 37

Fuel tank .......................................................... 38

Fuel filter .......................................................... 39

Fuel hose ......................................................... 39

Piston and cylinder ........................................... 41

Decompression valve – pressure testing ......... 42

Cylinder – pressure testing .............................. 44

Crankcase and crankshaft ............................... 45

Crankshaft bearings ......................................... 46

Repairing damaged threads ............................. 49

Thread insert .................................................... 49

Guide bar bolts ................................................. 49

Appendix A, Carburettor – EPA models ........... 50

English – 1

Introduction

Arrangement of the manual

This workshop manual can be used in two different

ways.

Troubleshooting

These pages describe the most common faults that

affect a chainsaw. They are divided into four

different groups with the most likely faults de-

scribed first.

• To repair a specific sub-assembly on a chainsaw.

• To dismantle and reassemble a complete

chainsaw.

Repair instructions

The section that describes how to repair the

chainsaw consists of detailed, step-by-step instruc-

tions. It explains in detail the special tools, lubri-

cants and bolt torques that are needed when

working on each component.

Repairing a specific sub-assembly

If a specific sub-assembly on the chainsaw needs

to be repaired:

1. Look up the page referring to the relevant sub-

assembly.

2. Follow the instructions under the headings:

Removal/Dismantling

Cleaning and inspection

Refitting/Reassembly

This workshop manual covers the following

chainsaw models:

Dismantling and reassembling the entire

chainsaw

340

345

346XP

350

351

353

If the entire chainsaw is to be dismantled, follow

the instructions under the heading “Removal/

Dismantling”.

Work through the manual and follow the instruc-

tions given in each section under the heading

“Removal/Dismantling”.

Then follow all the “Cleaning and inspection”

instructions in each section.

Working from the back of the manual, follow all the

instructions under the headings “Refitting/

Reassembly” in reverse order.

Each of the sections covering removal/dismantling

and refitting/reassembly include the relevant

lubrication instructions and bolt torques for each

stage of repair.

Construction and function

This chapter gives a simple description of the

chainsaw carburettor and its various parts.

2 – English

Safety regulations

General instructions

This workshop manual gives detailed instructions

on how to troubleshoot, repair and test a chainsaw.

This section also describes the various safety

precautions that should be taken when carrying out

repairs.

Special instructions

The fuel that is used in a chainsaw poses the

following hazards:

• The fuel and its fumes are toxic.

• May cause irritation to skin or eyes.

The workshop manual has been written for person-

nel who are assumed to have general experience

of repairing and servicing chainsaws.

• May cause breathing difficulties.

• Highly flammable.

Workshops where chainsaws are repaired must be

equipped with safety equipment that meets local

regulations.

When using compressed air the air jet should

never be pointed at the body. Air can be forced into

the bloodstream and cause fatal injury.

No-one should carry out repairs on a chainsaw

until they have read and understood the contents

of this workshop manual.

Wear ear protection when testing saws.

After testing a saw do not touch the silencer until it

has cooled down. The silencer gets very hot and

you may burn yourself. Wear protective gloves

when working on the silencer.

Chainsaws are type-approved to meet the relevant

safety legislation, but this only applies when the

saw is fitted with the cutting equipment specified in

the user’s manual. The fitting of any other equip-

ment, or of accessories or parts that are not

approved by Jonsered, could mean that the saw no

longer meets these safety requirements and the

person who carried out the work may be held

responsible for its non-conformance.

The guide bar, chain and clutch cover (chain brake)

must be fitted before the saw is started. If not, the

clutch may come loose and cause injury.

Poor chain lubrication can result in failure of the

chain, which could cause serious or fatal injury.

In this workshop manual the following boxes

indicate where caution should be taken.

Take care to ensure that the spring inside the

starter assembly does not fly out and cause injury.

Wear eye protection. If the spring is under com-

pression when the pulley is removed it could fly out

and cause injury.

WARNING!

The warning text warns of the risk

of personal injury if the instruc-

tions are not followed.

Before removing the tensioning spring from the

chain brake, ensure that the brake is in the on

position, otherwise the spring may fly out and

cause injury.

NOTE!

After completing the repair the chain brake must be

tested, see “Chain brake – reassembly \ Operating

test”.

The warning text warns of the risk of

material damage if the instructions are

not followed.

Always consider the fire risk. A chainsaw can

produce sparks that could start a fire.

Inspect the chain catcher and replace it if it is

damaged.

English – 3

Special tools

4 – English

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