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Husqvana chainsaw manual
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Content Preview
Workshop manual
340 345 346XP
350 351 353
English

www.rentsomeroom.com
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
Troubleshooting
This workshop manual can be used in two different
These pages describe the most common faults that
ways.
affect a chainsaw. They are divided into four
different groups with the most likely faults de-
* To repair a specific sub-assembly on a chainsaw.
scribed first.
* To dismantle and reassemble a complete
chainsaw.
Repair instructions
Repairing a specific sub-assembly
The section that describes how to repair the
If a specific sub-assembly on the chainsaw needs
chainsaw consists of detailed, step-by-step instruc-
to be repaired:
tions. It explains in detail the special tools, lubri-
cants and bolt torques that are needed when
1. Look up the page referring to the relevant sub-
working on each component.
assembly.
2. Follow the instructions under the headings:
Removal/Dismantling
Cleaning and inspection
Refitting/Reassembly
This workshop manual covers the following
Dismantling and reassembling the entire
chainsaw models:
chainsaw
340
345

If the entire chainsaw is to be dismantled, follow
346XP
the instructions under the heading "Removal/
350
Dismantling".
351
353

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
Special instructions
This workshop manual gives detailed instructions
The fuel that is used in a chainsaw poses the
on how to troubleshoot, repair and test a chainsaw.
following hazards:
This section also describes the various safety
precautions that should be taken when carrying out
* The fuel and its fumes are toxic.
repairs.
* May cause irritation to skin or eyes.
The workshop manual has been written for person-
* May cause breathing difficulties.
nel who are assumed to have general experience
* Highly flammable.
of repairing and servicing chainsaws.
Workshops where chainsaws are repaired must be
When using compressed air the air jet should
equipped with safety equipment that meets local
never be pointed at the body. Air can be forced into
regulations.
the bloodstream and cause fatal injury.
No-one should carry out repairs on a chainsaw
Wear ear protection when testing saws.
until they have read and understood the contents
of this workshop manual.
After testing a saw do not touch the silencer until it
has cooled down. The silencer gets very hot and
Chainsaws are type-approved to meet the relevant
you may burn yourself. Wear protective gloves
safety legislation, but this only applies when the
when working on the silencer.
saw is fitted with the cutting equipment specified in
the user's manual. The fitting of any other equip-
The guide bar, chain and clutch cover (chain brake)
ment, or of accessories or parts that are not
must be fitted before the saw is started. If not, the
approved by Jonsered, could mean that the saw no
clutch may come loose and cause injury.
longer meets these safety requirements and the
person who carried out the work may be held
Poor chain lubrication can result in failure of the
responsible for its non-conformance.
chain, which could cause serious or fatal injury.
In this workshop manual the following boxes
Take care to ensure that the spring inside the
indicate where caution should be taken.
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

Before removing the tensioning spring from the
of personal injury if the instruc-
chain brake, ensure that the brake is in the on
tions are not followed.
position, otherwise the spring may fly out and
cause injury.
After completing the repair the chain brake must be
NOTE!
tested, see "Chain brake - reassembly \ Operating
The warning text warns of the risk of
test".
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
1
2
3
4
5
6
7
8
9
10
11
12
13
14
4 - English

Special tools
15
16
17
18
19
20 b
20 c
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
20 a
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
21
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
22
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
23
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
English - 5

Technical data
Displacement
Cylinder bore
Stroke
Max power/speed
cm3/cubic inches
O mm/O 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"
6 - English

Technical data
rpm
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
GAS
OIL
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
English - 7

Construction and function
Carburettor
The carburettor works in different ways depending
on the setting:
The carburettor consists of three sub-systems:
* Cold start mode
* Idling mode
* Part throttle mode
* Full throttle mode
* 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.
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
* The mixing unit (B) consists of the choke,
diffuser jets faster (E).
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.
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).
8 - English

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).
English - 9

Document Outline

  • Workshop manual
  • Contents
  • Introduction
  • Safety regulations
  • Special tools
  • Technical data
  • Construction and function
  • Troubleshooting
  • Repair instructions

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