Husqvarna Prelude 350 Instruction manual

Workshop manual

English

340 345 346XP

350 351 353

English – 1

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

2– English

Arrangement of the manual

This workshop manual can be used in two different

ways.

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

• To dismantle and reassemble a complete

chainsaw.

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

Dismantling and reassembling the entire

chainsaw

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.

Introduction

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.

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.

This workshop manual covers the following

chainsaw models:

340

345

346XP

350

351

353

English – 3

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.

The workshop manual has been written for person-

nel who are assumed to have general experience

of repairing and servicing chainsaws.

Workshops where chainsaws are repaired must be

equipped with safety equipment that meets local

regulations.

No-one should carry out repairs on a chainsaw

until they have read and understood the contents

of this workshop manual.

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.

In this workshop manual the following boxes

indicate where caution should be taken.

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.

• May cause breathing difficulties.

• Highly flammable.

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.

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.

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.

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.

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.

After completing the repair the chain brake must be

tested, see “Chain brake – reassembly \ Operating

test”.

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.

WARNING!

The warning text warns of the risk

of personal injury if the instruc-

tions are not followed.

NOTE!

The warning text warns of the risk of

material damage if the instructions are

not followed.

Safety regulations

4– English

Special tools

11 12

123

English – 5

Item Description Used for Order no.

1 Clutch tool Centrifugal clutch 502 54 16-01

2 Piston stop Locking crankshaft 502 54 15-01

3 Stop plate Locating intake gaiter 502 54 17-01

4 Fuel filter hook Withdrawing the fuel filter 502 50 83-01

5 Allen key For M5 bolts 502 50 18-01

6 Puller Frame bearing 504 90 90-02

7 Removal tool Remove seal from clutch side 502 50 55-01

8 Mandrel, sealing ring Removing crankshaft 502 54 21-01

9 Cover plate Sealing during pressure testing 502 54 11-02

10 Pressure tester Connection to cylinder 503 84 40-02

11 Feeler gauge Adjusting ignition module 502 51 34-02

12 Clamp stand Clamping the saw 502 51 02-01

13 Pressure gauge Pressurisation during testing 502 50 38-01

14 Piston fitting kit Fitting piston 502 50 70-01

15 Test plug Checking ignition module 502 71 13-01

16 Rev counter Adjusting carburettor 502 71 14-01

17 Removal tool Removing crankshaft 502 51 61-01

18 Vacuum gauge Vacuum test 502 50 37-01

19 Assembly pliers Fitting spark plug guard 502 50 06-01

20a Sleeve Fitting crankshaft 502 50 30-18

20b Shaft extension Flywheel side 502 50 30-18

20c Shaft extension Clutch side 502 50 30-18

21 Stop plate Removing crankshaft 502 54 18-01

22 Assembly tool Assembling spring, chain brake 502 50 67-01

23 Crankshaft tool Fitting crankshaft seal 502 50 30-16

Special tools

15 16

20 b

20 c

20 a

6– English

Displacement Cylinder bore Stroke Max power/speed

cm3/cubic inches Ø mm/Ø inches mm/inches kW/hp/rpm

340: 40,8 / 2,44 40 / 1,57" 32 / 1,28" 2,0 / 2,7 / 9 000

345: 45,0 / 2,75 42 / 1,65" 32 / 1,28" 2,2 / 3,0 / 9 000

346XP/G: 45,0 / 2,75 42 / 1,65" 32 / 1,28" 2,5 / 3,4 / 9 600

350: 49,4 / 3,01 44 / 1,73" 32 / 1,28" 2,3 / 3,1 / 9 000

350 EPA: 51,7 / 3,15 45 / 1,77" 32 / 1,28" 2,3 / 3,1 / 9 000

351/G: 49,4 / 3,01 44 / 1,73" 32 / 1,28" 2,3 / 3,1 / 9 000

353/G: 51,7 / 3,15 45 / 1,77" 32 / 1,28" 2,4 / 3,3 / 9 000

Spark plug gap Ignition system Air gap Carburettor type

mm/inches mm/inches

340: 0,5 / 0,02" SEM CD 0,3 / 0,012" Walbro HDA 195

345: 0,5 / 0,02" SEM CD 0,3 / 0,012" Walbro HDA 195

346XP/G: 0,5 / 0,02" SEM CD 0,3 / 0,012" Zama C3-EL17

350: 0,5 / 0,02" SEM CD 0,3 / 0,012" Walbro HDA 195

350 EPA: 0,5 / 0,02" SEM CD 0,3 / 0,012" Zama C3-EL18

351/G: 0,5 / 0,02" SEM CD 0,3 / 0,012" Zama C3-EL17

353/G: 0,5 / 0,02" SEM CD 0,3 / 0,012" Zama C3-EL17

Effective cutting length Chain speed at Chain pitch Drive link

cm/inches max power – revs mm/inches mm/inches

m/s – rpm

340: 30-48 / 12"-19" 17,3 / 9 000 8,25 / 0,325" 1,3 / 0,050" - 1,5 / 0,058"

345: 30-48 / 12"-19" 17,3 / 9 000 8,25 / 0,325" 1,3 / 0,050" - 1,5 / 0,058"

346XP/G: 30-48 / 12"-19" 18,5 / 9 600 8,25 / 0,325" 1,3 / 0,050" - 1,5 / 0,058"

350: 30-48 / 12"-19" 17,3 / 9 000 8,25 / 0,325" 1,3 / 0,050" - 1,5 / 0,058"

350 EPA: 30-48 / 12"-19" 17,3 / 9 000 8,25 / 0,325" 1,3 / 0,050" - 1,5 / 0,058"

351/G: 30-48 / 12"-19" 17,3 / 9 000 8,25 / 0,325" 1,3 / 0,050" - 1,5 / 0,058"

353/G: 30-48 / 12"-19" 17,3 / 9 000 8,25 / 0,325" 1,3 / 0,050" - 1,5 / 0,058"

Technical data

English – 7

Technical data

Idling speed Engagement speed Max. speed Spark plug

rpm rpm rpm

340: 2 700 3 800 12 500 NGK BPMR 7A, Champion RCJ 7Y

345: 2 700 3 800 12 500 NGK BPMR 7A, Champion RCJ 7Y

346XP/G: 2 700 3 800 14 200 NGK BPMR 7A, Champion RCJ 7Y

350: 2 700 3 800 13 000 NGK BPMR 7A, Champion RCJ 7Y

350 EPA: 2 700 3 800 13 000 NGK BPMR 7A, Champion RCJ 7Y

351/G: 2 700 3 800 13 000 NGK BPMR 7A, Champion RCJ 7Y

353/G: 2 700 3 800 13 000 NGK BPMR 7A, Champion RCJ 7Y

Fuel tank capacity Oil pump capacity at Oil tank capacity Automatic oil pump

Litres/US pints 8,500 rpm, Litres/US pints

ml/min

340: 0,5 / 1,05 9 0,25 / 0,53 Yes

345: 0,5 / 1,05 9 0,25 / 0,53 Yes

346XP/G: 0,5 / 1,05 5 - 12 0,28 / 0,59 Yes

350: 0,5 / 1,05 5 - 12 0,26 / 0,55 Yes

350 EPA: 0,5 / 1,05 5 - 12 0,26 / 0,55 Yes

351/G: 0,5 / 1,05 5 - 12 0,28 / 0,59 Yes

353/G: 0,5 / 1,06 5 - 12 0,28 / 0,59 Yes

Weight without bar and chain Weight with bar and chain Heated hand grips

kg / lbs kg / lbs

340: 4,7 / 10,3 5,5 / 12,1 -

345: 4,7 / 10,3 5,5 / 12,1 -

346XP: 4,8 / 10,6 5,6 / 12,2 -

346XPG: 4,9 / 10,8 5,7 / 12,4 Yes

350: 4,8 / 10,6 5,6 / 12,2 -

350 EPA: 4,8 / 10,6 5,6 / 12,2 -

351: 4,8 / 10,6 5,6 / 12,2 -

351G: 4,9 / 10,8 5,7 / 12,4 Yes

353: 5,0 / 11,0 5,8 / 12,6 -

353G: 5,1 / 11,2 5,9 / 13,0 Yes

rpm

GAS

OIL

8– English

The carburettor works in different ways depending

on the setting:

• Cold start mode

• Idling mode

• Part throttle mode

• Full throttle mode

In the cold start mode the choke valve (D) is

completely closed. This increases the vacuum in

the carburettor so that fuel is sucked through the

diffuser jets faster (E).

In idling mode the throttle valve (F) is closed. Air is

sucked through an aperture in the throttle valve

and a small amount of fuel is supplied through the

diffuser jet (E).

Construction and function

Carburettor

The carburettor consists of three sub-systems:

• The metering unit (A) which contains the jets

and the fuel control mechanism. This measures

out the right amount of fuel to suit the speed of

the saw and the power demand.

• The mixing unit (B) consists of the choke,

diffuser jets and throttle valve. This is where the

air and fuel are mixed to create a flammable

mixture.

• The pump unit (C) pumps fuel from the tank to

the metering system inside the carburettor. One

side of the pump diaphragm is connected to the

crankcase and pulses as a result of pressure

changes in the crankcase. The other side of the

diaphragm sucks in the fuel.

English – 9

Construction and function

In part throttle mode the throttle valve (F) is par-

tially open. Fuel is supplied through the diffuser jets

(E).

In full throttle mode both valves are open and fuel

is supplied through all the diffuser jets (E).

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