Husqvarna 966451906 WM, 555, 560 XP, XPG, 562 2011 09 User Manual To The 10522c11 976c 4f25 9dcf 236edc299928
User Manual: Husqvarna 966451906 to the manual
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Page Count: 59
Workshop Manual
English
555 560XP/XPG
562XP/XPG
English - 3
Workshop Manual
Husqvarna 555, 560XP, 560XPG, 562XP and
562XPG
Contents
Index ...................................................................... 4
Introduction and safety instructions .................. 6
Technical data ...................................................... 10
Service tools ....................................................... 12
Service data ......................................................... 14
Safety equipment ................................................ 16
Repair instructions .............................................. 24
Carburettor .......................................................... 34
Troubleshooting ................................................... 56
Contents
Husqvarna AB has a policy of continuous product development and therefore reserves the right to modify
the design and appearance of products without prior notice.
4 - English
Index
Index
B
Bar bolt 54
Replacing the bar bolt 53
C
Carburettor 34
Assembly 38
Cleaning and inspection 38
Design 34
Dismantling 36
Function 35
Pressure testing the carburettor 40
Centrifugal clutch 30
Assembly of centrifugal clutch 31
Cleaning and inspection 30
Dismantling the centrifugal clutch 30
Chain brake 17
Assembling the chain brake 18
Cleaning and inspection 17
Dismantling the chain brake 17
Chain catcher 20
Replacing the chain catcher 20
Crankshaft and crankcase 49
Assembling a complete crankshaft 54
Dismantling the crankcase and crankshaft 49
F
Fuel system 44
Replacing the fuel lter 44
Replacing the fuel hose 44
I
Ignition module and flywheel 28
Assembling the ignition module and ywheel 29
Cleaning and inspection 28
Dismantling the ignition module and ywheel 28
Intake system 32
Assembling the intake system 33
Cleaning and inspection 33
Dismantling the intake system 32
Introduction and safety instructions 7
General 7
General Instructions 8
Modications 7
Numbering 7
Safety 7
Special Instructions 8
Structure 7
Target group 7
Tools 7
M
Muffler 19
Assembling the mufer 19
Dismantling the mufer 19
O
Oil pump and screen 31
Assembling the oil pump and screen 32
Cleaning and inspection 31
Dismantling the oil pump and screen 31
P
Piston and cylinder 45
Assembling the piston and cylinder 47
Dismantling the piston and cylinder 45
Faults and causes 47
Pressure testing the cylinder 48
S
Service data 14
Service tools 12
Starter 25, 26
Cleaning and inspection 25
Cleaning and inspection: 26
Dismantling the starter 25
Replacing a broken or worn starter cord 26
Replacing a broken return spring 27
Starter assembly 27
Stop control 20
Dismantling the stop control 20, 21
Stop function 21
Resistance test - stop function 21
Symbols
Symbols in the Workshop Manual 9
Symbols on the saw 9
T
Tank unit 42
Assembly 43
Dismantling 42
Tank valve 42
Technical Data 10
Threads 54
Repairing damaged threads 54
Throttle control lock, throttle lock and spring 22
Assembling the throttle lockout, throttle control
and spring 23
Cleaning and inspection 22
Dismantling the throttle control lock, throttle
control and spring 22
Troubleshooting 57
Troubleshooting methods 58
English - 5
Index
V
Vibration damping system 43
Assembly 43
Cleaning and inspection 43
Dismantling 43
6 - English
Introduction and safety instructions
2 Introduction and safety regulations
Contents
2.1 General ...........................................................................................................................7
2.2 Safety .............................................................................................................................7
2.3 Target group ...................................................................................................................7
2.4 Modications....................................................................................................................7
2.5 Tools ...............................................................................................................................7
2.6 Structure .........................................................................................................................7
2.7 Numbering ......................................................................................................................7
2.8 General instructions ........................................................................................................8
2.9 Special instructions .........................................................................................................8
2.10 Symbols on the saw .......................................................................................................9
2.11 Symbols in the Workshop Manual ..................................................................................9
English - 7
2 Introduction and safety instructions
Introduction and safety instructions
2.1 General
This Workshop Manual describes in detail how
to be troubleshoot, repair and test the chain saw.
A description of different safety steps that must be
taken during repair work is also given.
2.2 Safety
Note: The section dealing with safety must be
read and understood by all those carrying out
repair work or service on the chain saw.
Warning symbols can be found in this Workshop
Manual and on the chain saw. See “Symbols on
the saw” and “Symbols in the Workshop Manual”.
A new warning symbol decal must be applied as
soon as possible if a warning symbol on the chain
saw has been damaged or is missing so that the
greatest level of safety can be maintained when
using the chain saw.
2.3 Target group
This Workshop Manual is written for personnel who
are assumed to have general knowledge of repair-
ing and servicing chain saws.
The Workshop Manual must be read and under-
stood by personnel who will carry out repair work
and service on the chain saw. The Manual is also
suitable for use when training new employees.
2.4 Modifications
Any modications to the chain saw will be gradually
introduced into ongoing production. As these modi-
cations affect service and/or spare parts, specic
service information will be sent out on each occa-
sion. This means that in time this Workshop Manu-
al will become out of date. In order to prevent this,
the Manual should be read together with all service
information concerning the chain saw in question.
2.5 Tools
Special tools are required for some stages. All
service tools are listed in the Workshop Manual.
Usage is made apparent in each section.
Always use Husqvarna’s original:
• Spare parts
• Service tools
• Accessories
2.6 Structure
This Workshop Manual can be used in two different
ways:
• Repair of a specic system on the chain saw.
•
Dismantling and assembly of the entire chain saw.
Repair of a specific system
When a particular system on the chain saw is to be
repaired, proceed as follows:
1. Look up the page for the system in question.
2. Carry out the following steps:
Dismantling
Cleaning and inspection
Assembly
Dismantling and assembling the chain saw.
Proceed as follows when the chain saw is to be
dismantled and assembled:
1. Open the “Repair instructions” chapter which
deals with the Starter and carry out the in-
structions outlined under the Dismantling
heading.
2. Work forward in the Manual and carry out Dis-
mantling in the order set out in the sections.
3. Go back to the Starter and carry out the in-
structions under Cleaning and Inspection.
4. Work forward in the Manual and carry out
Cleaning and Inspection in the order set out
in the sections.
5. Order or collect all requisite spare parts from
the stores.
6. Look up the “Repair instructions” chapter which
deals with the Crankcase and carry out the
instructions outlined in Assembling.
7. Work back in the Manual and carry out Assem-
bling in the order set out in the sections.
Some sections include an introductory Descrip-
tion of the actual unit in order to increase the basic
understanding.
2.7 Numbering
Position references to components inside the g-
ures are designated A, B, etc.
The gures are numbered 1, 2 etc.
The position references and gure numbers restart
8 - English
2.8 General Instructions
The workshop where the chain saw is to be re-
paired must be equipped with safety equipment in
accordance with local regulations.
No one may repair the chain saw unless they have
read and understood the content of this Workshop
Manual.
This workshop manual contains the following warn-
ing boxes in relevant places.
2.9 Special Instructions
The fuel used in the chain saw has the following
hazardous properties:
• The uid and its vapour are poisonous.
• Can cause eye and skin irritation.
• Can cause breathing problems.
• Is highly inammable.
When using compressed air, do not direct the jet
towards your body. Air can penetrate into the blood
stream, which can endanger life.
Wear protective earplugs or earmuffs when test
running.
After test running, do not touch the mufer until
it has cooled down. Risk of burns. Use protective
gloves when working with the mufer.
Do not start the chain saw unless the bar, chain
and clutch cover (chain brake) are tted, otherwise
the clutch may loosen and cause personal injury.
Insufcient chain lubrication can result in chain
breakage, which can cause serious or even life-
threatening injury.
Exercise care to ensure the starter spring does not
y out and cause personal injury. Wear protective
glasses. If the spring tension is activated on the
starter pulley when it is to be taken up, the spring
can y out and cause personal injury.
Check that the brake is applied when removing the
pressure spring on the chain brake. Otherwise the
pressure spring can y out and cause personal
injury.
After repairing, check the chain brake, see “Assem-
bling chain brake \ Function check”.
Keep in mind the re risk. The chain saw may emit
sparks, which cause ignition.
Check the chain catcher and replace it if it is dam-
aged.
WARNING!
The warning box warns of the risk
of personal injury if the instruc-
tions are not followed.
NOTE!
This box warns of material damage if the
instructions are not followed.
Introduction and safety instructions
English - 9
Introduction and safety instructions
2.10 Symbols on the saw
The symbols below are embedded on the chain
saw.
Choke Lever
Refuelling
Stop button
Chain oil ll.
Chain brake
Decompression valve
Fuel pump
Adjusting the oil pump
2.11 Symbols in the Workshop Manual
This symbol warns of personal injury
when the instructions are not followed.
10 - English
Displacement Cylinder diameter Stroke length Max. output/speed
cm3/cubic inch Ø mm/Ø inch mm/inch kW/hp/ rpm
555: 59,8 / 3.65 46 / 1.81 36 / 1.42 3.1 / 4.2 / 9600
560XP/XPG: 59,8 / 3.65 46 / 1.81 36 / 1.42 3.5 / 4.8 / 9600
562XP/XPG: 59,8 / 3.65 46 / 1.81 36 / 1.42 3.5 / 4.8 / 9600
Electrode gap Ignition system Air gap Carburettor type
mm/inch mm/inch
555: 0,5 / 0.02 SEM 0,3 / 0.012 Zama
560XP/XPG: 0,5 / 0.02 SEM 0,3 / 0.012 Zama
562XP/XPG: 0,5 / 0.02 SEM 0,3 / 0.012 Zama
Usable cutting length Chain speed at Chain pitch Drive link
cm/inch max. output - speed mm/inch mm/inch
m/s - rpm
555: 33-61 / 13-24 21,3 / 9600 8.25 / 0.325 9,53 / 0.375 1.3 / 0.050 - 1,5 / 0.058
560XP/XPG: 33-61 / 13-24 21,3 / 9600 8,25 / 0.325 9,53 / 0.375 1,3 / 0.050 - 1,5 / 0.058
562XP/XPG: 38-71 / 15-28 21,3 / 9600 9,53 / 0.375 1,3 / 0.050 - 1,5 / 0.058
3 Technical data
Technical data
English - 11
Engage speed Spark plug Automatic oil pump
rpm
555: 3800 NGK CMR6H Yes
560XP/XPG: 3800 NGK CMR6H Yes
562XP/XPG: 3800 NGK CMR6H Yes
Volume fuel tank Capacity oil pump at Volume oil tank
Litre/US. pint 9,000 rpm, Litre/US. pint
ml/min
555: 0,65 / 1.37 6-15 0.33 / 0.70
560XP/XPG: 0,65 / 1,37 6-15 0,33 / 0.70
562XP/XPG: 0,65 / 1.37 8-18 0,35 / 0.74
Weight without bar and chain Weight with bar and chain
kg/lbs kg/lbs
555: 5,6 / 12.3 Weight depending on selected cutting equipment
560XP/XPG: 5,6 / 12.3
562XP/XPG: 5,7 / 12.6
GAS
OIL
Technical data
12 - English
6
10 11
4 Service tools
Service tools
3 5
8
1 2
79
4 mm
5 mm
4
4 mm
12a
12b
English - 13
Service tools
Pos Description Used for Order No.
1 Piston stop Locking the crankshaft 575 29 36-01
2 Hook for fuel lter Suspending the fuel lter 502 50 83-01
3 Allen key, 4 mm For M5 bolts 502 50 87-01
4 Allen key, 4 mm For M5 bolts 502 50 18-01
4 Allen key, 5 mm For M6 bolts 502 50 64-01
5 Air gap tool Setting, ignition module 502 51 34-02
6 Clutch tool Centrifugal clutch 575 25 14-01
7 Assembly xture Securing the chain saw 502 51 02-01
8 Pressure gauge Pressure testing 531 03 06-23
9 Test spark plug Checking the ignition module 501 97 64-01
10 Assembly pliers Fitting the spark plug guard 502 50 06-01
11 Dismantling device Dismantling the crankcase 575 28 69-01
12a Assembly tool Assembling the sealring 575 34 70-01
12b Guide sleeve Assembling the sealring 575 34 69-01
13a Cover plate, outlet Closure of outlet 574 71 14-01
13b Cover plate, inlet Closure of inlet 575 29 81-01
13c Cover plug, inlet Closure of inlet 574 70 12-01
13d Pressure tester Pressure testing the cylinder 503 84 40-03
14 Mandrel Dismantling the ywheel 502 51 94-01
15 Assembly tool Assembling the crankshaft 502 50 30-23
16 Puller Dismantling the crankshaft 531 00 48-67
17 Engine Diagnostic Tool Diagnosis and troubleshooting 576 69 23-01
14
13c
13b 16
17
13a13d
15
14 - English
5 Service data
Service data
12-15 Nm 5mm
1,5-2Nm 4mm
5-6Nm 4mm
Min. 25Nm
1-2Nm
8-10Nm 4mm
4-5Nm 4mm
18-20Nm 16mm
12-15 Nm 5mm
Min. 15Nm 13mm
12-14Nm 13mm
1-2Nm
1-2Nm
1-2Nm
s = Lubricate using two-stroke oil.
n = Lubricate using chain oil.
l = Lubricate using grease.
The numbers by the components to be assembled with
screws state the tightening torque in Nm.
Key
English - 15
Service data
3,5-4,5Nm 4mm
3,5-4,5Nm 4mm
4-5Nm 4mm
6-8Nm 4mm
7-9Nm 4mm
6-8Nm 4mm
22-25Nm 13mm
9-11Nm 4mm
3-4Nm 4mm
7-9Nm 4mm
3-4Nm 4mm
3-4Nm 4mm
2-3Nm 4mm
1-2Nm
3-4Nm 4mm
9-11Nm 4mm
8-10Nm 4mm
16 - English
6 Safety equipment
Safety equipment
Contents
6.1 Dismantling the chain brake ...........................................................................................17
6.2 Assembling the chain brake ............................................................................................18
6.3 Dismantling the mufer ...................................................................................................19
6.4 Assembling the mufer ...................................................................................................19
6.5 Replacing the chain catcher ...........................................................................................20
6.6 Dismantling the start/stop control ...................................................................................20
6.7 Assembling the start/stop control ....................................................................................21
6.8 Resistance test - stop function .......................................................................................21
6.9 Dismantling the throttle control lock, throttle control and spring .....................................22
6.10 Assembling the throttle control lock, throttle control and spring .....................................23
English - 17
3
Loosen the screws and insert a screwdriver to
maintain pressure on the spring, and then carefully
remove the cover over the brake spring, see g. 3.
WARNING!
Exercise care to ensure the spring
does not fly out and cause personal
injury. Wear protective goggles.
6.1 Dismantling the chain brake
2
Unscrew the kickback guard and remove it.
NOTE! Make sure that the spring and rocker do not
y out.
Carefully tighten the clutch housing in a vice. Re-
lease the brake by using the saw’s hand guard as
a tool. Mesh with the brake and tighten anti-clock-
wise until the brake is activated, see g. 2.
Cleaning and inspection
• Clean and check carefully all components. Parts
must be replaced if cracked or show signs of
other defects. Always use original spare parts.
• Measure the thickness of the chain brake band.
It must not be less than 0.6 mm in any place.
See gure 5.
• Lubricate the knee joint with grease.
4
Hold one hand on top of the brake spring and
press in a small screwdriver into the spring. Care-
fully bend upwards until the spring is released and
it slides onto the screwdriver, see g. 4.
Safety equipment
6 Safety equipment
1
Remove the cylinder cover.
Release the brake by moving the front hand guard
backward.
Loosen the bar nuts and remove the clutch cover,
bar and chain, see g. 1. Fig 1
Fig 2
Fig 3
Fig 4
Fig 5
Alt. 1
Alt. 2
18 - English
6.2 Assembling the chain brake
1
Screw the knee joint and the brake band together
(see gure 5) using a tightening torque of 1-1.5
Nm. Place the knee joint with the tted chain brake
band in the opening in the clutch cover. The space
for the spring in the cover must be lubricated with
grease. See gure 6.
2
Compress the spring with a wide screwdriver and
press it down with your thumb. See gure 7.
3
Fit the cover over the brake spring using 1-1.5 Nm
tightening torque. See gure 8.
WARNING!
Exercise care to ensure the spring
does not fly out and cause personal
injury. Wear protective goggles.
4
Tighten the brake by using the saw’s hand guard
as a tool. Mesh with the brake and tighten clock-
wise until the brake is in the off position. See
gure 9.
5
NOTE! Make sure the bushings in the kickback
guard’s attachments are kept in place from the
inside. See gure 9.
Screw the kickback guard in place and put the
rocket in position. Position the spring (B) in the
plastic housing (C) (see gure 10) and press the
spring against the rocker and then press the plastic
housing into its groove. Tighten the chain guide
plate in place.
Fit the:
• bar
• chain
• clutch shoe
• cylinder cover
Safety equipment
Fig 6
Fig 7
Fig 8
Fig 9
A
B
C
Fig 10
English - 19
NOTE!
After repairing, the chain brake must be in-
spected in line with the instruction below.
Functional inspection:
Do not turn on the motor when carrying out this
inspection.
Bar length Height
38 cm/15” 50 cm/20"
• Hold the chain saw over a stable surface. The
distance between the bar and the surface is
shown in the table above.
• Let go of the front handle and let the chain saw
drop toward the surface underneath.
• When the bar hits the surface the chain brake
must trigger.
Safety equipment
WARNING!
Do not touch the muffler until it
has cooled. Risk of burns.
6.3 Dismantling the muffler
1
Remove the cylinder cover, mufer, gasket and
cooling n.
2
The saw is tted with spark arrestor mesh, which is
removed. If necessary, use the combination span-
ner to push down the plate edge and remove the
spark arrestor mesh. See gure 12.
Cleaning and inspection
Clean and check all components carefully.
Parts must be replaced if cracked or show signs of
other defects. Always use original spare parts.
The spark arrestor mesh is best cleaned with a
wire brush.
The mesh must be replaced, if damaged.
The saw will overheat if the mesh is clogged result-
ing in damage to the cylinder and piston.
Never use a saw with a clogged or defective mufer.
6.4 Assembling the muffler
1
If the saw is tted with a spark arrestor mesh, put
it in place rst. When tting the mesh, make sure
that the mesh is inserted in the right position. If
necessary, use the combination spanner to insert
the mesh.
2
Fit the:
• cooling n
• gasket
• mufer, tightening torque of 12-14 Nm.
• Cylinder cover
3
Warm up the saw for at least one minute and
retighten the screws on the mufer to 12 to 14 Nm.
Fig 12
Fig 11
20 - English
6.5 Replacing the chain catcher
A worn chain catcher must always be replaced with
a new one. Always use original spare parts.
1
Release the brake by moving the front hand guard
backward.
Loosen the bar nuts and remove the clutch cover,
chain and bar.
2
Remove the chain catcher and replace it with a
new one.
Make sure that the vibration element is tted cor-
rectly on the crankcase when a new chain catcher
is screwed in place. See gure 13.
Safety equipment
6.6 Dismantling the start/stop control
1
Remove the cylinder cover and air lter. Dismantle
the air lter holder. See the “Dismantling the carbu-
rettor” chapter.
2
Loosen screw B and dismantle the stop control A.
See gure 14. Unhook the rubber collar around the
control from the guide plugs.
Cleaning and inspection
Clean and check carefully all components. Parts
must be replaced if cracked or show signs of other
defects. Always use original spare parts.
Fig 13
Fig 14
English - 21
Safety equipment
6.8 Resistance test - stop function
Dismantle the ignition module as outlined in
“7.7 Dismantling the ignition module and ywheel”.
Cut open the shrink tube covering both cables and
shrink tubing that encloses the cable ends.
Clean the contact areas and check resistance in
the following way:
Test the resistance by connecting a multimeter to
the cable ends. NOTE! The power switch must be
in the “on” position to get the correct reading. See
gure 17.
The stop switch is in the “on” position when the
button is held down (see gure 17) and in the “off”
position when the button is in neutral.
Resistance can be 0.5 Ohm at most with the power
switch in the “on” position.
When assembling (see gure 18), pull the cable
ends apart and slide on a thicker shrink tube over
both cables. Then slide on the thinner shrink tubes
over each cable. Connect the cable ends together.
Slide the thinner shrink tubes over the cable ends
and heat the shrink tube rst on both cables sepa-
rately. Slide the thicker shrink tube over the thinner
shrink tubes and then heat the thicker shrink tube.
6.7 Assembling the start/stop control
1
Fit the new stop control (A) and tighten screw (B) in
place at a torque of 1 Nm. Slide in the stop control
in the rubber sleeve C and hook the sleeve on the
guide taps. See gure 15.
Fig 15
Fig 16
2
Attach the cables as outlined in gure 16.
3
Attach the air lter holder. See the “Assembling the
carburettor” chapter.
4
Fit air lter and cylinder cover.
Fig 18
Fig 17
22 - English
Safety equipment
3
Press out the throttle control pin (C) with the help
of a punch. See gure 21.
4
Loosen the throttle cable (D) and lift out the throttle
control and the spring. See gure 22.
5
6.9 Dismantling the throttle control
lock, throttle control and spring
1
Loosen the screw on the rear handle. Remove the
handle insert (A). See gure 19.
Cleaning and inspection
• Carefully clean and check all parts. See gure
13. Parts must be replaced if cracked or show
signs of other defects. Always use original
spare parts.
• Check that the spring is intact and retains all its
tension.
Fig 20
Fig 21
Fig 22
Fig 23
Fig 19
A
2
Loosen the throttle control lock (B) as shown in the
gure using a screwdriver or similar tool. Remove it
then from the shaft in the handle. See gure 20.
English - 23
6.10 Assembling the throttle control
lock, throttle control and spring
1
Lubricate the pin and joined surfaces with a light
oil. Hook on the throttle cable (D). Slide in the
throttle control and make sure the spring is tted as
outlined in gure 24.
NOTE! Make sure that the rear end of the throttle
control is correctly aligned inside the cut-out edg-
ing before the pin is pressed in place.
Safety equipment
Fig 24
Fig 25
Fig 26
C
2
Fit the throttle control’s pin (C) using a punch. See
gure 25.
3
Fit the throttle control lock (B) by sliding it on the
shaft in the handle. See gure 26. Make sure the
spring is positioned inside the throttle control lock
when you press it down so that the barbs are
hooked in place.
4
Fit the handle insert using a screw, when the
throttle control, spring, throttle cable and throttle
control lock with pin are tted correctly.
24 - English
7 Repair instructions
Repair Instructions
Contents
7.1 Dismantling the starter ....................................................................................................25
7.2 Replacing a broken or worn starter cord ........................................................................26
7.3 Tensioning the return spring ...........................................................................................26
7.4 Replacing a broken return spring ...................................................................................27
7.5 Starter assembly..............................................................................................................27
7.6 Dismantling the ignition module and ywheel .................................................................28
7.7 Assembling the ignition module and ywheel .................................................................29
7.8 Dismantling the centrifugal clutch ...................................................................................30
7.9 Assemby of centrifugal clutch .........................................................................................31
7.10 Dismantling the oil pump and screen .............................................................................31
7.11 Assembling the oil pump and screen ..............................................................................32
7.12 Dismantling the intake system ........................................................................................32
7.13 Assembling the intake system ........................................................................................32
7.14 Carburettor .....................................................................................................................34
7.15 Tank unit .........................................................................................................................42
7.16 Venting the fuel tank .......................................................................................................42
7.17 Vibration damping system ..............................................................................................43
7.18 Replacing the fuel lter ...................................................................................................44
7.19 Replacing the fuel hose/return hose ...............................................................................44
7.20 Replacing the fuel pump ..................................................................................................44
7.21 Dismantling the piston and cylinder ................................................................................45
7.22 Assembling the piston and cylinder ................................................................................47
7.23 Pressure testing the cylinder ..........................................................................................48
7.24 Dismantling the crankshaft and crankcase .....................................................................49
7.25 Assembling the complete crankshaft ..............................................................................54
7.26 Replacing the bar bolt .....................................................................................................53
7.27 Repairing damaged threads ............................................................................................54
English - 25
Repair Instructions
WARNING!
If the spring tension is activated
on the starter pulley, the spring
can fly out and cause personal
injury. Wear protective glasses.
7.1 Dismantling the starter
1
Loosen the four screws, which hold the starter
against the crankcase and remove the starter.
3
Loosen the screw in the centre of the pulley and
remove the pulley. See gure 3. Loosen the screws
on the cassette and remove the cassette and
spring.
Cleaning and inspection
Clean the parts and check:
• The starter cord.
• That the starter pawls on the ywheel are intact,
i.e. that they spring back to the centre and
move easily.
• To lubricate the return spring using light oil.
7 Repair instructions
2
Pull the cord out about 30 cm and lift it into the
notch on the outside of the starter pulley. Release
the tension in the return spring by letting the starter
pulley rotate anti-clockwise. See gures 1 and 2.
Fig 1
Fig 2
Fig 3a
26 - English
Repair instructions
7.2 Replacing a broken or worn starter
cord
When the starter cord is worn and must be replaced,
the tension in the return spring must be released.
1
Pull the cord out about 30 cm and lift it into the
notch on the outside of the starter pulley. Release
the tension on the return spring by allowing the
starter pulley to rotate slowly backwards.
7.3 Tensioning the return spring
1
Pull the starter cord up into the notch in the starter
pulley and turn the pulley about 3 turns clockwise.
Check that the pulley can be turned at least a fur-
ther 1/2 turn when the starter cord is pulled all the
way out. See gure 4.
2
Stretch the line with the handle. Remove your
thumb and let the cord spin back. See gure 5.
3
When the starter pulley is removed, insert a new
starter cord and attach it to the starter pulley.
Thread the other end of the starter cord through
the hole in the starter housing and starter handle
and tie a double knot on the cord. Wind approx. 3
turns of the starter cord on the starter pulley. Turn
the starter pulley until it latches into the correct po-
sition. Tighten the screw at the centre of the starter
pulley, at a tightening torque of 2-3 Nm.
Cleaning and inspection:
• Clean and check carefully all components. Worn
or damaged parts must be replaced. Lubricate
the return spring with a light oil.
WARNING!
If the spring tension is activated on
the starter pulley, the spring can fly
out and cause personal injury.
Wear protective glasses.
2
Loosen the screw in the centre of the pulley and
remove the pulley. See gure 3a.
Fig 4
Fig 5
Fig 3b
English - 27
Repair Instructions
WARNING!
Exercise care to ensure the spring
does not fly out and cause person-
al injury. Wear protective goggles.
7.4 Replacing a broken return spring
1
Loosen the screw at the centre of the starter pulley
and loosen the screws on the cassette. Remove
the starter pulley with the cassette and spring.
2
Remove the broken cassette and replace it with a
new one.
3
Tighten the screw at the centre of the starter pulley,
at a tightening torque of 2-3 Nm. Load the return
spring, see “Loading the return spring”. See also
the “Dismantling the starter” chapter.
7.5 Starter assembly
1
Position the starter against the crankcase and
tighten the screws at a tightening torque of
3-4 Nm.
28 - English
Repair Instructions
7.6 Dismantling the ignition module
and flywheel
1
Remove the cylinder cover. Remove the starter.
Snap off the ignition cable from the guide rail and
remove the guide rail. See gure 7.
4
Thread the mandrel on the crank pin. Screw in until
1-2 threads are left to the ywheel. Knock on the
mandrel with a suitable metal hammer while at the
same time pulling the ywheel outward until the
ywheel comes off the shaft. Remove mandrel and
ywheel. See gure 9.
Unscrew the air nozzle to replace the ignition mod-
ule. Loosen the screws on the ignition module. See
gure 10.
Dismantle the air lter, air lter holder and carburet-
tor. See the “Dismantling the carburettor” chapter.
Dismantle the tank unit as outlined in the “Disman-
tling the tank unit” chapter.
Dismantle the intake system, see the “Dismantling
the intake system” chapter.
Loosen the earth cable. See gure 11. Pull the
cables through the openings in the crankcase.
Cleaning and inspection
• Clean all parts, especially the tapers on the
ywheel and shafts.
• Check the ywheel for cracks or any other signs
of damage.
2
Knock out a few of the pins in the tool if it does not
match up with the ywheel.
Use the tool to hold the ywheel in place while the
ywheel nut is loosened using a suitable socket
wrench. See gure 8.
Fig 7
Fig 8
Fig 9
Fig 10
English - 29
Repair Instructions
7.7 Assembling the ignition module and
flywheel
1
Run the cables through the opening in the crank-
case. Screw the earth cable in place. See gure 11.
Fit the cabling to the stop button.
2
Position the cable channel as outlined in gure 10.
NOTE! Take care that the cable channel is posi-
tioned correctly under the ignition module so that
the cables are not crushed.
3
Place the ignition module in position. See gure 13.
Do not tighten the screws.
Fig 12
Fig 13
4
Fit the ywheel onto the crankshaft pin. Turn the
ywheel until the key ts into the key slot on the
shaft. See gure 12.
Tighten the screw for the ywheel.
5
Insert the plastic air gap tool, at a thickness of
0.3 +- 0.1 mm, between the lugs on the ignition
module and ywheel. Turn the ywheel so that the
magnets are positioned opposite the ignition mod-
ule. Tighten the screws, at a tightening torque of
4.5- 6 Nm. Remove the plastic air gap tool. Fit the
intake system as outlined in “7.14 Assembling the
intake system”, the tank unit as outlined in “7.16
tank unit”, and the air lter as outlined in “Assem-
bling the carburettor”.
6
Press the ignition lead into the holder on the parti-
tion wall.
7
Then t:
• The air nozzle
• The guide rail and press the cable in place
• the spark plug hat by unscrewing the piston stop.
•
The starter, at a tightening torque of 2.5-3.5 Nm
• The cylinder cover
Fig 11
30 - English
Repair Instructions
4
Secure the clutch in a vice as shown in gure 16.
Carefully remove the clutch springs. Remove the
clutch shoe springs from the side that does not
have text.
NOTE!
Be careful with the clutch springs, as
opening them too much can result in
material damage.
Cleaning and inspection
• Clean and check all parts carefully. Parts must
be replaced if cracked or showing signs of
other defects. Always use original spare parts.
• Check the thickness of the clutch shoes by meas-
uring them with slide callipers across the whole
clutch hub. If the thickness is below 60 mm, the
clutch must be replaced. See gure 16.
2
Loosen the spark plug hat and remove the
spark plug, and insert the plastic piston stop
(575 29 36-01). See gure 15.
3
Loosen the clutch using tool 575 25 14-01nd a suit-
able socket wrench or combination spanner. Turn
the clutch clockwise to loosen it. See gure 15.
7.8 Dismantling the centrifugal clutch
1
Remove the cylinder cover. Release the brake by
moving the kickback guard backwards. Loosen the
bar nuts and remove the clutch cover, chain and
bar. See gure 14.
Fig 14
Fig 16 Min 60 mm
Fig 15
English - 31
7.9 Assembly of centrifugal clutch
1
Insert the clutch springs on the side of the shoes
without text. See gure 17.
2
Screw in the clutch (anti-clockwise) until it stops.
Then tighten the clutch using tool 575 25 14-01
and a suitable socket wrench or combination span-
ner. Tightening torque of at least 25 Nm.
3
Remove the piston stop and t the spark plug
using a tightening torque of 20 Nm and the spark
plug hat.
Then t:
• The cylinder cover
• The bar
• The chain
• The clutch cover
7.10 Dismantling the oil pump and
screen
1
Empty and clean the oil tank.
Dismantle the centrifugal clutch as outlined in
“Dismantling the centrifugal clutch”.
2
Loosen the clutch drum, the drive sprocket, the
needle bearing and the pump drive wheel. See
gure 18.
3
Unscrew the chain guide plate. See gure 19.
4
Loosen the screws on the oil pump from the crank-
case and remove it together with the oil pressure
hose. See gure 20.
Cleaning and inspection
• Clean and check all parts carefully. Parts must
be replaced if cracked or showing signs of
other defects. Always use original spare parts.
• Lubricate all moving parts with chain oil.
Repair Instructions
Fig 17
Fig 19
Fig 18
Fig 20
32 - English
DD
D
D
E
Repair Instructions
7.11 Assembling the oil pump and screen
1
Lower the oil lter in place and replace the oil pump
as outlined in gure 19 and tighten the screws.
2
Fit the pump drive wheel, the needle bearing, the
drive sprocket, the clutch drum and the clutch, us-
ing a tightening torque of 25 Nm.
3
Adjust the oil pump. See Figure 21.
4
Fit the clutch. See the “Assembling the centrifugal
clutch” chapter.
5
Fit the chain, bar and clutch cover.
WARNING!
Insufficient chain lubrication can
result in chain breakage, which
can cause serious personal injury.
7.12 Dismantling the intake system
The intake system consists of:
• The inlet manifold, A
• The partition wall, B
• The intake ange, C
See Figure 22.
1
Dismantle the cylinder cover.
2
Loosen screws D and the movement limiter E as
outlined in gure 23. Loosen the ignition cable.
Fig 21
Fig 22
Fig 23
English - 33
Repair Instructions
7.13 Assembling the intake system
1
Assemble the intake system.
2
Fit the lower screws of the intake system using the
POP-out hole and the fuel hose hole. Fit the other
screws. Fit the fuel hose and the throttle cable to
their attachments. See gure 24.
Fit the rubber grommet to the throttle cable. Push
the tank back in position. Hook on the cabling to
the holder on the intake system.
3
NOTE! Press the lug on the carburettor in place on
its bracket on the partition wall. See gure 24.
Fit the carburettor, the lter holder and the air lter
as outlined in “Assembling the carburettor”.
Cleaning and inspection
Clean and check all parts carefully. Parts must
be replaced if cracked or showing signs of other
defects. Always use original spare parts.
3
Dismantle the air lter, the lter holder, the cable
from the intake ange holder and the carburettor
and the throttle cable as outlined in “Dismantling
the carburettor”. NOTE! The lug on the carburettor
sits on the bracket on the partition wall.
4
Hook off the cabling from the holder on the intake
system (J). Knock out the POP-out window using a
screwdriver. See gure 25. Lower the tank slightly
and slide the fuel hose down into the hole. Loosen
the lower screws of the intake system using the
POP-out hole and the fuel hose hole. Loosen the
other screws.
5
Dismantle the intake system. Pull up and then out-
ward. See gure 26.
Fig 24
Fig 25b
Fig 26
Fig 25a
34 - English
Repair Instructions
WARNING!
The fuel used in the chain saw has
the following hazardous properties:
1. The fluid and its vapour are
poisonous.
2. Can cause skin irritation.
3. Is highly inflammable.
7.14 Carburettor
Description
The gures accompanying this description do not
correspond with the carburettor on the chain saw.
They show only the principle of design and func-
tion.
Design
The carburettor is based on three sub-systems:
• Metering unit, A.
• Mixing unit, B.
• Pump unit, C.
In the pump unit C, fuel is pumped from the fuel
tank to the carburettor’s metering unit. One side of
the pump diaphragm is connected to the crankcase
and pulses in time with the pressure changes in
the crankcase. The other side of the diaphragm
pumps the fuel. See gure 29.
The needles and the fuel’s control functions are
located in the metering unit, A. Here the correct
quantity of fuel is adjusted for the actual speed and
power output. See gure 27.
The mixing unit B houses the choke, the throttle
valve and the diffuser jets. Here air is mixed with
the fuel to give a fuel/air mixture that can be ignited
by the ignition spark. See gure 28.
Fig 28
Fig 29
B
Fig 27
English - 35
Repair Instructions
Function
The carburettor operates differently in the following
modes:
• Cold start mode
• Idling mode
• Part throttle mode
• Full throttle mode
In cold start mode the choke valve H is completely
shut. This increases the vacuum in the carburettor
and fuel is easier to suck from all the diffuser jets
D, E, and F. The throttle valve I is partly open. The
throttle valve, J, is closed. See gure 30.
In idling mode, the throttle valves I and J are
closed and the choke valve H is open.
Air is sucked in through an aperture in the throttle
valve and a small amount of fuel is supplied
through the diffuser jet D. See gure 31.
In part throttle mode, the throttle valve I is partly
open and the choke valve H is fully open. Fuel is
supplied through the diffuser jets D and E. The
throttle valve, J, starts to open. See gure 32.
In the full throttle mode both valves are open and
fuel is supplied through all four diffuser jets (D, E,
F and G). The throttle valve, J, is fully open. See
gure 32.
Fig 30
Fig 31
Fig 32
Fig 33
36 - English
Repair Instructions
Dismantling the carburettor
1
Dismantle the cylinder cover and the air lter.
2
Loosen the screws, F. Unhook the rubber attach-
ment G on both sides. See Figure 35.
Fig 35
Fig 34
6
Use a small at screwdriver to snap open the con-
nector from the black attachment. Separate the
connector by pressing down the catch with a at
screwdriver and then pulling the unit apart. See
gure 37.
3
Loosen the suction hose A, the return hose B, and
the tank bleeding hose C. See gure 34.
4
Remove the air lter holder. Let the air lter holder
remain in place in the cabling for the stop button.
Loosen the fuel hose, D. Unhook the throttle cable,
E. See gure 34.
5
NOTE! Press down the lug to release the carburet-
tor. Lift out the carburettor. See gure 36.
D
E
Fig 36
NOTE!
The lug on the carburettor is securely
attached to the partition wall.
Fig 37
English - 37
H
J
K
Q
R
LM
P
Repair Instructions
7
Dismantle the pump cover H and carefully remove
the control diaphragm J and gasket K.
8
Unscrew screw P and remove needle valve M with
lever arm Q, shaft L and spring R.
9
Use a needle or similar device and carefully pull up
the fuel screen (W). See gure 39.
10
If necessary, dismantle throttle valve T and choke
valve U and air valve S, and remove the shafts with
lever arms and springs (see gure 39).
11
If necessary, dismantle the AutoTune AB unit. See
gure 39.
Fig 38
38 - English
Repair Instructions
Assembly
Observe cleanliness when assembling the car-
burettor. The slightest contamination can result in
downtime.
1. If throttle and choke valves with shafts, lever
arms and springs are removed, these must be
assembled. The spring is tensioned 1-2 turns.
Lubricate the shaft bearings using a light oil.
2. Fit the fuel screen W using the handle of a
small screwdriver. See gure 39.
3. Fit the gasket X in the carburettor as well as the
holder Y. Screw in place screw Z as outlined in
gure 39.
4. See gure 39 on how to assemble the
AutoTune AB unit with gasket.
Note! When replacing the AutoTune unit or car-
burettor with an AutoTune unit, the unit must rst
be programmed before it can be used. Refer to
the local support page for more information.
Cleaning and inspection
Clean all units in clean petrol.
Use compressed air to dry the petrol on the com-
ponents. Direct the air through all channels in the
carburettor housing and ensure that they are not
blocked. Check the following:
1. That the gasket, pump and control diaphragms
are undamaged, as well as the gasket between
the carburettor body and the autotuner.
2. That there is no play on the throttle and choke
valve shafts.
3. That the needle valve M and its lever arm Q are
not worn. See gure 38.
4. That the fuel screen W is intact and clean. See
gure 39.
5. That the inlet manifold V is intact. See gure 39.
6. Use the service tool, Engine Diagnostic Tool
576 69 23-01, to inspect the AutoTune unit.
See separate instruction.
S
T
W
X
U
Y
V
Z
AB
Fig 39
English - 39
Repair Instructions
4. Assemble needle valve M with lever arm Q,
shaft L and spring R, and tighten screw P.
(Fit the expansion washer). See gure 40.
5. Check using a ruler or the like that the lever is
level with the assembly plane on the cover.
If necessary, the lever arm can be bent, see
gure 41.
7. Fit gasket K, the control membrane J and the
pump cover H. See gure 42.
8. Carry out a pressure test.
Fig 41
Fig 42
K
J
H
Fig 40
40 - English
Fitting on the saw
1
Press the connector together as outlined in gure
44 and push it into place in the holder.
Repair Instructions
Leak in Fault with
Diffuser jets Needle valve
Leak in the impulse pipe Pump membrane
Ventilation hole on the Control membrane
metering unit.
Pressure testing the carburettor
Pressure testing should be carried out with the car-
burettor fully assembled. Testing should always be
carried out after the carburettor has been repaired,
but a test can also be made for troubleshooting
before dismantling.
Option 1
See the gure and carry out the check as follows:
1
Connect pressure tester to the carburettor fuel inlet.
2
Submerge the carburettor into a container with
water. See gure 43.
3
Pump up the pressure to 20 kPa.
4
No leakage is permitted. If a leakage occurs refer
to the table below.
Option 2
1
Plug the connections to the fuel inlet.
2
Create a vacuum to the purge nipple on the car-
burettor. No leakage is permitted. In the case of
leakage, leakage spray can be used even it if is dif-
cult. Try and identify where the spray is absorbed.
It can be used to show leakages in main jets, idling
needles, measuring cover gaskets and measuring
diaphragms, and autotune gaskets.
Fig 43
Fig 44
Fig 45
English - 41
D
E
Repair Instructions
Fig 48
Fig 46
Fig 49
2
Make sure the cabling is tted to its mounting on
the intake ange.
Press the fuel hose (D) in place in the collar on the
intake bellows.
Hook on the throttle cable (E) in its mounting on
the intake bellows. See gure 46.
Make sure the lug on the carburettor hooks in
place on its mounting on the intake system.
Make sure that the following components are
correctly fitted:
• Position the air lter holder against the carburettor.
• Make sure the carburettor cover’s intake channel
is aligned correctly with the slot for the air lter
holder.
• The spring must be tted under the choke pin on
the carburettor. See gure 47.
• The rubber collar on the stop button must be on
the inside of the bottom of the carburettor com-
partment. See gure 47.
• NOTE! Make sure that the fuel and return hoses
are not crushed.
3
Position the guide taps on the air lter holder in the
rubber grommets, G. See gure 48.
4
Hook on the throttle cable, E. See gure 46.
Fasten the return hose B and secure it in its mount-
ings on the air lter holder.
Attach the pressure hose A, with the short hose on
the short plastic plug on the fuel pump.
Attach the tank bleeding hose, C. See gure 49.
5
Hook it on the left side and then the right side of
the carburettor in the rubber mounting. Then screw
the carburettor in place. See gure 48.
6
Fit the air lter.
Fig 47
42 - English
7.15 Tank unit
Dismantling
1. Drain the fuel from the tank.
2. Remove the cylinder cover, the clutch cover, the
chain and the bar. See the Operator’s Manual.
Dismantle the carburettor as outlined in “Dis-
mantling the carburettor”.
3. Loosen the hoses A to D. See gure 50.
4. Loosen the screws F. See gure 51.
5. Loosen the movement limiter H. See gure 53.
6. Pull out the hoses A to D in the bottom of the car-
burettor compartment. Unhook the throttle cable,
E, from the intake bellows before pulling out from
the bottom of the carburettor compartment.
NOTE!
Exercise care so that the fuel hose and
throttle cable are not damaged.
Repair Instructions
WARNING!
The fuel used in the chain saw has
the following hazardous properties:
1. The fluid and its vapour are poisonous.
2. Can cause skin irritation.
3. Is highly inflammable.
7.16 Venting the fuel tank
The two-way valve has the following properties:
• Controlled opening pressure in both directions,
which prevents a positive pressure or a vacu-
um developing in the fuel tank and impairing
engine performance. This also prevents fuel
leakage.
• Opening pressure outward 100-450 mbar.
• Opening pressure inward (vacuum) max.
70 mbar. (2 locations)
Test
Opening pressure outwards:
1. Open the tank lock and leave it open during the
entire test. Drain the fuel from the tank.
2. Loosen the positive pressure hose as outlined
in gure 54. Connect the pump, ref. no. 531 03
06-23, to the tank valve J.
3. Switch the pump to vacuum mode.
4. After pumping the indicator should be between
10-45 kPa.
Opening pressure inwards:
1. Open the tank lock and leave it open during the
entire test. Drain the fuel from the tank.
2. Loosen the positive pressure hose as
outlined in gure 54. Connect the pump,
ref. no. 531 03 06-23, to the tank valve J.
3. Switch the pump to pressure mode.
4. After pumping the indicator should stop at max.
7 kPa.
Fig 50
Fig 51
G
G
Fig 53
Fig 52
English - 43
Assembly
1. Thread the throttle cables in the connection M
as outlined in gure 55. NOTE! The gure is
shown from underneath.
2. Run the fuel hose D through hole K and hoses
B and C in hole L. See gure 55. Pull the hoses
so that the collars are on each side of the bot-
tom on the carburettor compartment.
3. Tighten the chain catcher in place.
4. Press the movement limiter H into position. See
gure 53.
5. Tighten the screws F. See gure 51.
6. Hook on the throttle cable E in the intake bellow.
See gure 50.
7. Fit the tank unit. The two short screws are tted
to the bottom of the handle bar.
8. Assemble the carburettor as outlined in “Assem-
bling the carburettor”. Assemble the air lter
and cylinder cover.
Repair Instructions
7.17 Vibration damping system
Dismantling
1. Dismantle the following parts:
• Bar and chain. See the Operator’s Manual.
• Cylinder cover. See the Operator’s Manual.
• Tank unit and handle. See “Dismantling the
tank unit”.
2. Dismantle the spring on the handle bar using a
4 mm Allen key (see gure 57).
3. Dismantle the springs on the tank unit using
a 4 mm Allen key (tool 502 50 18-01). See
gure 57.
Cleaning and inspection
Clean and inspect all parts.
Assembly
1. Fit the springs on the handle bar using a 4 mm
Allen key (tool 502 50 18-01).
2. Assemble the following parts:
• Tank unit and handle. See “Assembling the
tank unit”.
• Cylinder cover. See the Operator’s Manual.
• Bar and chain. See the Operator’s Manual.
Fig 55
Fig 54
Fig 56
Fig 57
44 - English
1
When replacing the fuel lter, the old fuel lter must
be taken out of the tank unit using special tool
502 50 83-01.
2
Pull out fuel hose B from the tank unit and pull
away the lter A. See gure 58.
3
Fit the new fuel lter A and press the
fuel hose back into place.
7.19 Replacing the fuel hose/return hose
The fuel hose is moulded and can only be removed
from outside of the fuel tank.
Use suitable pliers with a smooth cutting face and
loosen the hose B from the fuel tank. See gure 58.
Replace the return hose when required. Tighten
the fuel hose on the lter side with your ngers.
7.20 Replacing the fuel pump (Purge)
Dismantle
1. Dismantle the cylinder cover and the air lter.
2. Loosen suction hose C and return hose from
the fuel pump. See gure 59.
3. Snap off the fuel pump from the lter holder.
Assembling
1. Snap the fuel pump in place in the lter holder.
See gure 59.
2. Fit the return and suction hose on the fuel
pump.
3. Assemble the air lter and cylinder cover.
NOTE!
Fluted pliers may not be used with the fuel
hose. They can cause material damage
resulting in damage to the fuel hose.
Repair Instructions
7.18 Replacing the fuel filter
Fig 59
Fig 58
English - 45
Repair Instructions
7.21 Dismantling the piston and cylinder
1
Dismantle:
• The cylinder cover
• The carburettor (see “Dismantling the
carburettor”)
• The mufer
• The vibration element
• The spark plug cap
• The intake system
2
Unscrew the cylinder’s four screws
and carefully lift away the cylinder and the gasket.
See gure 60.
Cleaning and inspection of the cylinder
Clean all components, scrape off all gasket re-
mains and soot from the following areas:
• The piston crown
• The top of the cylinder bore (inside)
• The cylinder exhaust port
• The base of the cylinder and/or crankcase
Fig 60
Fig 61
3
Cover over the crankcase opening.
4
Remove the circlips for the gudgeon pin and press
out the gudgeon pin. The lift off the piston. See
gure 61.
5
Remove the gudgeon pin bearing (the needle bear-
ing) using a pliers. See gure 61. Replace with a
new bearing.
NOTE!
Take care to prevent any dirt and foreign
particles from entering the crankcase.
46 - English
Repair Instructions
Check the following:
• That the cylinder’s surface coating is not worn.
Especially the upper part of the cylinder.
• That the cylinder does not have any chafe or
cutting marks.
• That the piston is free of score marks. Minor
scratches can be polished off using ne emery
paper.
• That the piston ring is not burnt into its groove.
• Measure the wear on the piston ring. This must
not exceed 1 mm. See gure 62. Use the pis-
ton to push the piston ring downward.
• That the gudgeon pin bearing is intact.
• That the intake bellows is intact.
• Pressure test the decompression valve. Carry
out pressure testing on the decompression
valve as follows. See also gure 68.
A. Fit the pressure gauge tool 531 03 06-23 to
the decompression valve.
B. Pump up the pressure to 80 kPa (0.8 bar).
C. Wait 30 seconds.
D. The pressure must not fall below 60 kPa
(0.6 bar).
Unscrew the cover plates for the carburettor and
mufer. Tighten the screws to the stated torque.
Remove the pressure test connection 503 84 40-02
and t the spark plug.
Fig 62
Fig 68
English - 47
Faults and causes
Score marks on the piston (A)
1. Leakage, check not carried out.
2. Too low octane fuel.
3. Too low or incorrect oil in the fuel.
Carbon build-up (B)
1. Too much or incorrect oil in the fuel.
See Figure 63.
Piston ring breakage
1. Piston ring worn out.
2. Oversized piston ring groove.
7.22 Assembling the piston and cylinder
1
Oil the gudgeon pin bearing with two-stroke oil and
insert it into the crank rod. See gure 64.
2
Replace the piston with the arrow facing the ex-
haust port, and slide in the gudgeon pin and t the
circlips. NOTE! Use new circlips. See gure 64.
3
Oil the piston and piston ring with two-stroke oil.
4
Put a new cylinder base gasket in place. Compress
the piston ring and carefully push the piston into
the cylinder opening.
5
Attach the cylinder. The screws must be tightened
crosswise with a tightening torque of 8-10 Nm.
NOTE!
It is very important that the intake system is
sealed. Otherwise the engine may seize up.
Repair Instructions
Fig 63
Fig 65
Fig 64
AB
48 - English
Repair Instructions
WARNING!
Once the cylinder has been
pressure tested, make sure the
inlet manifold is fitted correctly.
Otherwise the chainsaw can be
damaged.
7.23 Pressure testing the cylinder
1
Loosen
• The cylinder cover
• The carburettor
2
Attach the cover plate 574 71 14-01 and plug
574 70 12-01. See gure 66.
3
Loosen the screws on the mufer and press the
cover plate 575 29 05-01 between the mufer and
cylinder. Tighten the screws for the mufer. See
gure 66. Use the plastic piston stop 575 29 36-01.
4
Screw the pressure test connection 503 84 40-02
in place. Connect tool 531 03 06-23 to the nipple.
5
Pump the pressure up to 80 kPa (0.8 bar). Wait
30 seconds. The pressure should not be less than
60 kPa (0.6 bar). Remove the cover plates from
the silencer and carburettor, tighten the bolts to the
specied torque. Remove the pressure test nipplle-
and ret the spark plug.
Fig 66a
Fig 66b
Fig 67
English - 49
Repair Instructions
7.24 Dismantling the crankshaft and
crankcase
1
Dismantle the following:
• The clutch cover
• The chain and bar.
• The centrifugal clutch *
• The cylinder cover
• The starter *
• The ywheel *
• The carburettor *
• The bottom of the carburettor *
• The hand guard *
• The mufer *
• The handle system *
• The fuel unit *
• The piston and cylinder *
• The ignition module
• Cabling
• The oil pump
* See specic instruction.
x4
Fig 69
Fig 70
Fig 71
NOTE!
Take care to prevent any dirt and foreign
particles from entering the bearings.
2.
If required, remove the circlip on the ywheel side.
3.
Remove the 5 screws from the pulley wheel side.
See Figure 69.
4.
Fit tool 575 28 69-01 as outlined in gure 70.
Remove the crankcase half on the clutch side.
5.
Fit tool575 28 69-01 as outlined in gure 71.
Remove the ywheel side’s crankcase half.
6.
Carefully pull the crankcase halves apart. Two
guide pins keep the crankcase halves together. Lift
out the connecting rod and dispose of the gasket.
WARNING!
Beware of burn injuries as the crankcase
halves are hot. Wear protective gloves.
50 - English
Fig 72
Fig 73
7.
If required, remove the crankshaft bearing from the
crankcase.
Proceed as follows:
A. Remove the oil rell cap.
B. Heat up the crankcase half in question to 200°C.
C. Use protective gloves. Press the bearing out of
the crankcase half.
8.
If the crankshaft bearings are still attached to the
crankshaft when dismantling, pull them off using
the 531 00 48-67 pulling device. See gure 73.
Also inspect the bearing grip in the crankcase half.
Cleaning and inspection
NOTE!
If the bearings are fitted to the crankcase,
take care to prevent any dirt and foreign
particles from entering.
Clean all parts and scrape off all gasket remains
from the contact surfaces on the crankcase halves.
Check the following:
1.
That the big-end bearing does not have any radial
play. Axial play is permitted. See gures 74 and 75.
2.
That the big-end bearing does not have any score
marks or is discoloured on the sides.
3.
That the bearing surface for the gudgeon pin bearing
does not have any score marks or is discoloured.
4.
That the crankshaft bearing has no play or knocks.
5.
That the sealing surfaces of the sealing rings tted
against the crankshaft are not worn, and that the
rubber is not hard.
6.
That the crankcase is not cracked.
Fig 74
Fig 75
Repair Instructions
English - 51
Fig 76
Fig 77
Fig 78
x4
Assembly
WARNING!
Beware of burn injuries as the
crankcase halves are hot. Wear
protective gloves.
1
Proceed as follows if a bearing must be tted:
A. Heat up the crankcase half in question to 200°C.
B. Use protective gloves. Fit the bearing in the
ywheel side of the crankcase half. When tting
the bearing in the clutch side of the crankcase
half, the bearing must be tted aligned with the
inside of the crankcase.
C. Allow the crankcase half to cool down before
continuing with the work.
NOTE!
Take care to prevent any dirt and foreign
particles from entering the bearings.
D. Fit the oil rell cap.
2.
See page 52, gure 80, for how to t new sealing
rings.
NOTE!
Make sure the connecting rod is not crushed
against the crankcase when the crankcase
and crankshaft are fitted together.
3.
Use the 502 50 30-23 tool. Use the back end of
the sleeve and slot the crankshaft in place into the
clutch side of the crankcase half. See Figure 76.
Tighten until the crankshaft collar comes into con-
tact with the bearing.
4.
Insert the guide pin in the crankcase half on the
clutch side, apply grease and t the gasket(C). See
Figure 77.
5
Use the 502 50 30-23 tool. Turn the sleeve and slot
the crankcase half in place on the ywheel side.
Tighten until the gasket is pinned in place between
the crankcase halves. See Figure 78.
6
Fit the screws. Tighten them alternately. Finally
tighten then to 8 Nm. See gure 79.
7
Fit the carburettor bottom with the four screws.
Tighten the screws using 5 Nm of torque. See
gure 79.
NOTE!
Make sure that any excess gasket does
not finish up in the crankcase.
Repair Instructions
Fig 79
52 - English
Fig 80
Fig 81
8
Assemble the following parts:
A. Tank unit. See page 43.
B. Piston and cylinder. See page 47.
C. Mufer. See page 19.
D. Carburettor. See page 40.
E. Centrifugal clutch. See page 31.
F. Electrical System. See page 29.
G. Starter. See page 25.
H. Bar and chain. See the Operator’s Manual.
Sealing rings
1
To replace the crankshaft’s sealing rings, rst dis-
mantle the following parts:
On the ywheel side:
• Starter. See page 25.
• Flywheel. See page 28.
On the clutch side:
• Bar and chain. See the Operator’s Manual.
• Chain guide plate. See page 17.
• Centrifugal clutch. See page 30.
• Oil pump. See page 31.
2
Use a screwdriver to remove the sealing ring and
pull it out.
3
Slide the dowel 575 34 69-01 (gure 80) on the
crankcase pin. Knock the new sealing ring in place
using the 575 34 70-01 tool. See Figure 81.
4
Fit the parts as outlined in point 1 above.
Repair Instructions
English - 53
Repair Instructions
7.25 Assembling a complete crankshaft
1
Fit the complete crankshaft in the crankcase.
Fit the following parts:
• The piston and cylinder *
• The fuel unit *
• The handle system *
• The mufer *
• The hand guard *
• The bottom of the carburettor *
• The carburettor *
• The ywheel *
• The starter *
• The cylinder cover
• The centrifugal clutch *
• The chain and bar.
• The clutch cover
* See specic instruction.
54 - English
Repair Instructions
7.26 Replacing the bar bolt
Replacing a bar bolt with intact crankcase
1
Empty the oil tank.
2
Knock in the old bar bolts from the outside so that
they end up in the oil tank.
3
Remove the bolts from the oil tank.
4
Attach a wire to the head of the bar bolt, lower the
wire through the oil tank and out through the bolt
opening in the crankcase. See gure 83.
5
Pull out the bar bolt so that it protrudes from its
opening. See gure 83.
6
Pull out the bar bolt with its nut. Insert a spacer
between the nut and the crankcase. See gure 83.
7
Fill with chain oil.
7.27 Repairing damaged threads
If threads on the chainsaw are worn, the repa-
ration kit, 503 27 33-01, is available.
First drill with:
6.1 mm drill for the magnesium crankcase
Then screw in the thread plug using a suitable
screw and wrench.
This type of screw plug is ideal for plastic
and magnesium but cannot be used to repair
threads in aluminium. There is another type of
thread plug and metric screw available for this
purpose. See gure 84. Check the manufac-
turer’s manual for thread information.
Fig 84
Fig 83
English - 55
56 - English
Troubleshooting
8 Troubleshooting
Contents
8.1 Troubleshooting ..............................................................................................................57
8.2 Troubleshooting methods ...............................................................................................58
English - 57
Troubleshooting
Starting
Idling (low speed)
Idling (low speed) (continued)
Leaking inlet hose (rubber)
Loose carburettor mounting
Loose or faulty fuel pipe
Blocked fuel lter
Blocked fuel line
Tank ventilator blocked
The throttle valve shaft is inert
Throttle stay is binding
Defective throttle return spring
Bent valve axle stop
Faulty diffuser jet
Worn needle/needle tip
Worn lever arm in the control
system
Leaking diaphragm/cover plate
Does not idle
Too rich idling
8.1 Troubleshooting
The different faults which may occur on the chain saw are divided into four groups. Within each group
possible operating faults are listed to the left while the probable fault alternatives are listed to the right.
The most likely fault is listed rst, etc. See separate instruction for Autotune troubleshooting.
Worn needle/needle tip
Leaking diaphragm/cover plate
Worn lever arm in the control
system
Faulty diffuser jet
Blocked fuel lter
Blocked fuel line
Leaking inlet hose (rubber)
Loose carburettor mounting
Worn throttle valve axle
Loose throttle valve screw
Worn throttle valve
Leaking control system
(air or fuel)
The control system’s centre
knob is worn
Hole in diaphragm
Leaking diaphragm/
cover plate
Leaking crankcase
Blocked fuel line
Leaking control system
(air or fuel)
Leaking diaphragm/cover plate
Faulty diffuser jet
Leaking crankcase
Worn needle/needle tip
Leaking diaphragm/
cover plate
Difcult to start
The carburettor
leaks fuel
Floods when the
engine is not
running
Air lter blocked
Choke does not work
Worn choke axle
Worn choke valve
Blocked fuel lter
Blocked fuel line
Piston ring is stuck
Blocked impulse channel
Loose or faulty fuel pipe
Hole in diaphragm
Worn needle/needle tip
Control system sticking
Control system set too high
Leaking control system
(air or fuel)
The cover on the carburettor
pump side is loose
Worn needle/needle tip
Control system set too high
Control system sticking
Uneven idling
Too much fuel at
idle speed
58 - English
Troubleshooting
Acceleration and retardation
Does not
accelerate
The engine
stops when
releasing the
throttle
Blocked air lter
Tank venting clogged
Blocked fuel lter
Blocked fuel line
Loose or faulty fuel pipe
Blocked impulse channel
The cover on the carburettor
pump side is loose
Faulty pump diaphragm
Leaking inlet hose (rubber)
Loose carburettor mounting
Control system set too low
Control system incorrectly
assembled
Control system sticking
Faulty diffuser jet
Blocked mufer
Faulty pump diaphragm
Control system set too high
Control system sticking
Faulty diffuser jet
Blocked air lter
Faulty pump diaphragm
Faulty diffuser jet
8.2 Troubleshooting methods
In addition to faults given in the above schematic,
troubleshooting can be carried out on a specic
component or specic chain saw system. The
different procedures are described in respective
sections and are as follows:
• Function check of chain brake
• Resistance testing the stop plate
• Pressure testing the carburettor
• Pressure testing the decompression valve
• Pressure testing the cylinder
High speed
Will not run
at full throttle
Low power
Will not “four
stroke”
Blocked air lter
Tank venting clogged
Blocked fuel lter
Blocked fuel line
Loose or faulty fuel pipe
Impulse channel leaking
Blocked impulse channel
The cover on the carburettor
pump side is loose
Faulty pump diaphragm
Leaking inlet hose (rubber)
Loose carburettor mounting
Control system set too low
Damaged control system
Control system incorrectly
assembled
Leaking diaphragm/cover plate
Control system sticking
Blocked mufer
Tank venting clogged
Blocked fuel lter
Impulse channel leaking
Blocked impulse channel
The cover on the carburettor
pump side is loose
Faulty pump diaphragm
Blocked air lter
Control system sticking
Leaking control system (air or
fuel)
Control system incorrectly
assembled
Loose diaphragm
Hole in diaphragm
Leaking diaphragm/cover plate
Tank venting clogged
Blocked fuel lter
Blocked fuel line
Loose or faulty fuel pipe
Impulse channel leaking
Blocked impulse channel
The cover on the carburettor
pump side is loose
Faulty pump diaphragm
Leaking inlet hose (rubber)
Loose carburettor mounting
Control system set too low
Leaking control system
(air or fuel)
Control system incorrectly
assembled
Loose diaphragm
Hole in diaphragm
Leaking diaphragm/cover plate
2011W31
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