Workshop manual
510 16 77-26
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Index
Index
Symbols in the Workshop Manual 9
Symbols on the saw 9
Structure 7
Target group 7
Tools 7
B
Bar bolt 52
Replacing the bar bolt 52
C
Carburettor 33
Assemble on the saw 40
Assembly 38
O
Oil pump and screen 31
Assembling the oil pump and screen 32
Carburettor adjustment 41
Cleaning and inspection 37
Design 33
Cleaning and inspection 31
Dismantling the oil pump and screen 31
Dismantling 35
Function 34
Pressure testing the carburettor 39
P
Piston and cylinder 45
Cleaning and inspection 45
Cylinder - pressure testing 49
Faults and causes 47
Piston and cylinder - refitting 47
Piston and cylinder - removal 45
Centrifugal clutch 30
Centrifugal clutch - refitting 31
Centrifugal clutch - removal 30
Inspection and cleaning 30
Chain brake 17
S
Chaine brake - reassembly 18
Cleaning and inspection 17
Dismantling the chaine brake 17
Service data 14
Special tools 12
Chain catcher 20
Chain catcher - replacement 20
Silencer 19
Cleaning and inspection 19
Silencer - refitting 19
Silencer - removal 19
Crankcase and crankshaft 50
Crankshaft bearings - replacement 50
Crankshaft complete - dismantling 50
Crankshaft complete - reassembly 51
Starter 25, 26
Changing a broken or worn starter cord 26
Cleaning and inspection 25, 26
Replacing a worn recoil spring 27
Starter assembly - refitting 27
Starter assembly - removal 25
Tensioning the recoil spring 26
F
Fuel system 44
Replacing the fuel filter 44
Replacing the fuel hose/return hose 44
Replacing the air-purge 44
Venting the fuel tank 42
Start/Stop switch 20
Assembling the start/stop control 21
Cleaning and inspection 20
Dismantling the start/stop control 20
I
Ignition module and flywheel 28
Cleaning and inspection 28
Ignition module - testing 27
Stopping function 21
Stop switch - resistance measurement 21
Ignition module and flywheel - refitting 29
Ignition module and flywheel - removal 28
T
Tank unit 42
Assembly 43
Dismantling 42
Intake system 32
Air intake system removal 32
Assembling the intake system 32, 48
Cleaning and inspection 32
Technical Data 10
Threads 51
Introduction and safety instructions 7
Changes 7
General 7
Repairing damaged threads 51
Throttle lock, throttle trigger
and return spring 22
General Instructions 8
Numbering 7
Safety 7
Cleaning and inspection 23
Throttle lock, throttle trigger and
return spring - refitting 23
Throttle lock, throttle trigger and
return spring - removal 22
Special Instructions 8
4 – English
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Index
Trouble shooting 54
Trouble-shooting methods 55
V
Vibration damping system 43
Assembly 43
Cleaning and inspection 43
Dismantling 43
English – 5
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Introduction and safety instructions
2 Introduction and safety instructions
Contents
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
General ...........................................................................................................................7
Safety .............................................................................................................................7
Target group ...................................................................................................................7
Changes..........................................................................................................................7
Tools ...............................................................................................................................7
Structure .........................................................................................................................7
Numbering ......................................................................................................................7
General instructions ........................................................................................................8
Special instructions .........................................................................................................8
2.10 Symbols on the saw .......................................................................................................9
2.11 Symbols in the Workshop Manual ..................................................................................9
6 – English
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Introduction and safety instructions
2 Introduction and safety instructions
2.1 General
2.6 Structure
This Workshop Manual describes in detail how the
chain saw is to be fault traced, repaired and tested.
A description of different safety measures that
should be taken during repair work is also given.
This Workshop Manual can be used in two diffe-
rent ways:
•
•
For the repair of a particular system on the
chain saw.
2.2 Safety
Dismantling and assembly of the entire chain
saw.
Note! The section dealing with safety must be
read and understood by all those carrying out
repair work or service on the chain saw.
Repair of a specific system
When a particular system on the chain saw is to be
repaired, proceed as follows:
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 decal must be applied as soon as possible if a
warning symbol on the chain saw has been da-
maged or is missing so that the greatest possible
safety can be obtained when using the chain saw.
1. Look up the page for the system in question.
2. Carry out the sections: Dismantling
Cleaning and inspection
Assembling
2.3 Target group
Dismantling and assembling the entire chain saw
Proceed as follows when the entire chain saw is to
be dismantled and assembled:
This Workshop Manual is written for personnel with
general knowledge about the repair and service of
chain saws.
1. Look up the chapter “Repair instructions”,
which deals with the Starter and carry out the
instructions set out under Dismantling.
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. Work forward in the Manual and carry out Dis-
mantling in the order set out in the sections.
2.4 Changes
3. Go back to the Starter and carry out the in-
structions under Cleaning and Inspection.
Modifications will be successively introduced on
the chain saw during production. When these
modifications affect the service and/or spare parts,
separate service information will be sent out on
each occasion. This means that in time this Work-
shop Manual 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.
4. Work forward in the Manual and carry out
Cleaning and Inspection in the order set out
in the sections.
5. Order or take out all requisite spare parts from
the stores.
6. Look up the chapter “Repair instructions” which
deals with the Crankcase and carry out the
instructions set out under Assembling.
2.5 Tools
7. Work back in the Manual and carry out As-
sembling in the order set out in the sections.
Special tools are required for some stages. All
service tools are listed in the Workshop Manual.
Usage is evident from respective sections.
Some sections include a Description of the actual
unit in order to increase the basic understanding.
Always use Husqvarna’s original:
• Spare parts
2.7 Numbering
• Service tools
• Accessories
Position references to components inside the figu-
res are designated A, B, etc.
The figures are numbered 1, 2 etc.
The position references and figure numbers restart
in each new section.
English – 7
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Introduction and safety instructions
2.8 General instructions
2.9 Special instructions
The workshop where chain saw repairs are to be
done must be equipped with safety equipment as
set out in local provisions.
The fuel that is used in a chainsaw poses the fol-
lowing hazards:
•
•
•
•
The fuel and its fumes are toxic.
May cause irritation to skin or eyes.
May cause breathing difficulties.
Highly flammable.
No one may repair the chain saw unless they have
read and understood the content of this Workshop
Manual.
In this workshop manual the following boxes indi-
cate where caution should be taken.
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.
WARNING!
The warning text warns of the risk
of personal injury if the instruc-
tions are not followed.
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.
NOTE!
The warning text warns of the risk of ma-
terial damage if the instructions are not
followed.
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
compression 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.
8 – English
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Introduction and safety instructions
2.10 Symbols on the saw
2.11 Symbols in the Workshop Manual
The symbols below are embedded on the chain
saw.
This symbol warns of personal injury
when the instructions are not followed
Choke Lever
Refuelling
Stop button
Filling with chain oil
Air purge
Chain brake, activated (right)
Chain brake, not activated (left)
English – 9
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Technical data
3 Technical data
Displacement
cm3/cubic inches
Cylinder bore
Ø mm/Ø inches
Stroke
mm/inches
Max power/speed
kW/hp/rpm
CS 2240/S:
40,9 / 2,49
41 / 1,51
31 / 1,22
1,8 / 2,4 / 9 000
Spark plug gap
mm/inches
Ignition system
Walbro MBU-16
Air gap
mm/inches
Carburettor type
Zama EL41AC1T
CS 2240/S:
0,5 / 0,02
0,3 / 0,012
Effective cutting length
cm/inches
Chain speed at
max power – revs
m/s - r/min
Chain pitch
mm/inches
Drive link
mm/inches
CS 2240/S: 33-46 / 13-18
17,3 / 9 000
8,25 / 0,325
1,3 / 0,050 - 1,5 / 0,058
10 – English
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Technical data
rpm
Idling speed
rpm
Engagement speed
rpm
Spark plug
CS 2240/S:
2 900
3 800
NGK BPMR 7A
Champion RCJ 7Y
GAS
OIL
Fuel tank capacity
Litres/US pints
Oil pump capacity at
8,500 rpm,
ml/min
Oil tank capacity
Litres/US pints
Automatic oil pump
CS 2240/S:
0,37 / 0,78
9
0,25 / 0,53
Yes
Weight without
bar and chain
kg / lbs
Weight with
bar and chain
kg / lbs
CS 2240/S:
4,4 / 9,7
5,7 / 12,6
English – 11
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Special tools
4 Special tools
2
1
3
4
7
5
6
M5
M5
M6
8
9
11
10
12 – English
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Special tools
12
13a
13b
15
16b
16c
17
16a
18
Item Description
Used for
Order no.
1
2
3
Clutch tool
Centrifugal clutch
Locking the crankshaft
502 54 16-03
504 91 06-05
502 50 83-01
Piston stop
Fuel filter hook
Withdrawing the fuel filter
4
5
5
Allen key, 4mm
Allen key, 4mm
Allen key, 5mm
For M5 bolts
For M5 bolts
For M6 bolts
502 50 87-01
502 50 18-01
502 50 64-01
6
7
8
Pressure tester
Feeler gauge
Pressure testing cylinder
Adjusting ignition module
Assembling chain saw
503 84 40-02
502 51 34-02
502 51 02-01
Assembly fixture
9
Pressure gauge
Pressurisation during testing
Checking the ignition module
Adjusting carburettor
531 03 06-23
501 97 64-01
502 71 14-01
10 Test spark plug
11 Rev counter
12 Assembly pliers
Fitting spark plug guard
Sealing the exhaust port
Sealing the intake manifold
502 50 06-01
502 54 11-02
504 63 93-01
13a Cover plate, exhaust
13b Cover plates, inlet
14 Assembly tool
15 Puller
Assembling spring, chain brake 502 50 67-01
Pulling bearing of crankshaft
Fitting crankshaft
504 90 90-01
502 50 30-22
16a Sleeve
16b Shaft extension
16c Shaft extension
17 Punch
Flywheel side
502 50 30-22
502 50 30-22
502 51 94-01
530 03 55-60
Cluch side
Dismantling the flywheel
18 Adjustment screwdriver Adjustment of the carburettor
English – 13
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Service data
5 Service data
14 – English
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Service data
English – 15
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Safety equipment
6 Safety equipment
Contents
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
6.9
Dismantling the chain brake ...........................................................................................17
Chain brake - reassembly ...............................................................................................18
Silencer - removal ...........................................................................................................19
Silencer - refitting ............................................................................................................19
Chain catcher - replacement ..........................................................................................20
Dismantling the start/stop control ...................................................................................20
Stop switch - resistance measurement ...........................................................................21
Assembling the start/stop control ....................................................................................21
Throttle lock, throttle trigger and return spring - removal ................................................22
6.10 Throttle lock, throttle trigger and return spring - refitting .................................................23
16 – English
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Safety equipment
6 Safety equipment
6.1 Dismantling the chain brake
1
Release the brake by moving the front hand guard
backward. Loosen the bar nut and remove the
clutch cover, chain and bar (see figure 1).
Fig 1
Fig 2
Fig 3
2
Carefully tighten the clutch housing in a vice.
Release the brake by using the saw's front hand
guard (A) as a tool. Mesh with the brake and tigh-
ten anti-clockwise until the brake is activated. (see
figure 2)
WARNING!
Exercise care to ensure the spring
does not fly out and cause perso-
nal injury. Wear protective glasses.
3
Loosen the screws and carefully remove the cover
over the brake spring. (see figure 3)
4
Hold one hand over the brake spring; press a nar-
row screwdriver in between the rear section of the
spring and the clutch cover. Carefully pry upward
until the spring releases and runs onto the screw-
driver shaft. (see figure 4)
Fig 4
Cleaning and inspection
•
•
•
Carefully clean and check all parts. Parts must
be replaced if cracked or show signs of other
defects. Always use original spare parts.
min 0,6 mm
Measure the thickness of the chain brake band.
It must not be less than 0.6 mm at any point.
(see figure 5)
Lubricate the knee joint with grease.
Fig 5
English – 17
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Safety equipment
6.2 Chain brake – reassembly
1
Bolt the elbow joint to the brake band (see figure 5)
and tighten to a torque of 1–1.5 Nm.
Locate the elbow joint and connected brake band
in their recesses in the clutch cover. Lubricate the
recess for the spring with grease (see figure 6).
Secure the circlip (A) (see figure 6).
Fig 6
2
Grip the clutch cover in a vice. Compress the
spring with special tool 502 50 67-01 and push it
down with your thumb (see figure 7).
WARNING!
Make sure the spring does not fly
out and cause injury. Wear eye
protection.
Fig 7
3
Fit the cover over the chain brake spring, tighten-
ing the screws to a torque of 1–1.5 Nm (see figure
8).
Fig 8
4
Tension the brake spring by using the kickback
guard from the saw as a tool. Engage it with the
brake mechanism and turn clockwise to release
the brake (see figure 9).
5
Turn the chain tensioner anticlockwise as far as it
will go.
Refit:
•
•
•
guide bar
Fig 9
chain
clutch cover
NOTE!
After completing the repair the chain
brake must be tested as described below.
18 – English
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Safety equipment
Operating test:
The engine must not be running during the test.
Guide bar length Height
38cm/15"
50 cm/20"
•
Hold the chainsaw over a firm surface. The
height of the guide bar above the surface is
given in the table above.
•
•
Let go of the front handle and let the chainsaw
fall towards the surface.
Fig 10
When the guide bar hits the surface the chain
brake must engage (see figure 10).
6.3 Silencer – removal
WARNING!
Do not touch the silencer until it
has cooled down, otherwise you
may burn yourself.
1
Remove the cylinder cover, silencer, gasket and
cooling plate.
2
If the saw is fitted with a spark arrestor mesh (A) this
must also be removed. If necessary, use the com-
bination spanner to push down the plate edge and
remove the spark arrestor mesh (see figure 11).
Fig 11
Cleaning and inspection
Clean and inspect all parts carefully. If there are any
cracks or other defects replace the damaged parts
with new ones.
The spark arrestor mesh is best cleaned with a wire
brush. If the mesh is damaged it must be replaced.
If the mesh is blocked the saw will overheat and this
will cause damage to cylinder and piston.
Never use the saw with a silencer that is in poor
condition. Always use original parts.
6.4 Silencer – refitting
1
If the saw is equipped with a spark arrestor mesh
this should be fitted first. When fitting the mesh,
make sure that the mesh is inserted in the right
position. If necessary, use the combination spanner
to insert the mesh.
2
Refit
•
•
•
•
cooling plate
gasket
silencer, tighten bolts to a torque of 8–10 Nm.
cylinder cover
3
Run the saw for at least 1 minute, then retighten the
silencer bolts to 12–14 Nm.
English – 19
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Safety equipment
6.5 Chain catcher – replacement
If the chain catcher is worn it must be replaced with
a new one.
1
Release the brake by pushing the kickback guard
backwards. Undo the guide bar bolts and remove
the clutch cover, chain and guide bar.
2
Remove the chain catcher and replace it with a
new one. Check that the vibration damping spring
locates correctly against the crankcase when you
bolt the new chain catcher in position. (see figure
12)
Fig 12
6.6 Dismantling the start/stop control
1
Remove the cylinder cover and air filter.
2
Loosen the screw and dismantle the control (see
figure 13).
3
Loosen the filter holder from the rubber mountings
(B). (see figure 13)
4
Cut off the starlock washer and pull out the control
from the shaft on the filter holder.(see figure 14)
Fig 13
Cleaning and inspection
Clean and inspect all parts carefully. If there are
any cracks or other defects replace the damaged
parts with new ones. Always use original parts.
20 – English
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Safety equipment
6.7 Stop switch – resistance
measurement
Clean the mating surfaces and check the resis-
tance as follows:
Measure the resistance by connecting a multime-
ter to the ignition coil. NOTE! The switch must be
in the “on” (A) position to give the correct reading
(see figure 14).
The resistance must not be higher than 0.5 Ohm
when the switch is in the on position.
The stop switch is in the on position when the
button is held down (A) (see figure 14) and in the
off-position the button is neutral (B) (see figure 15).
Fig 14
Fig 15
6.8 Assembling the start/stop control
1
Fit a new control and tighten the screw.
2
Fit air filter and cylinder cover.
Fig 16
English – 21
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Safety equipment
6.9 Throttle lock, throttle trigger and
return spring – removal
1
Loosen the throttle actuator rod on the carburettor,
the fuel hose and the suction hose to the fuel pump.
A
2
Dismantle the tank unit from the engine unit by
loosening the screws A (see figure 17)
A
A
2xA
Fig 17
A
3
Dismantle the handle insert (B) by loosening the
screw C on the handle (see figure 18).
Fig 18
4
Press out the throttle control pin (D) with the help
of a punch (see figure 19).
Fig 19
5
Loosen the throttle lock as illustrated with the help
of a screwdriver or the like. Then dismantle from
the shaft in the handle (see figure 20).
6
Dismantle the throttle control (see figure 20).
Fig 20
7
Now loosen the spring.
Fig 21
22 – English
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Safety equipment
Cleaning and inspection
•
Clean and inspect all parts carefully. If there are
any cracks or other defects replace the dama-
ged parts with new ones. Always use original
parts.
•
Check that the spring is not broken and has not
lost its tension.
6.10 Throttle lock, throttle trigger and
return spring – refitting
1
Lubricate all pins and mating surfaces with a light
oil.
2
Fit the throttle control (B) and spring (C) (see
figure 22).
3
Hold the spring and insert the throttle lock into the
cut-out in the handle (see figure 23).
Fig 22
4
Fit the throttle control pin (E) with the help of a
punch. (see figure 23)
5
Fit the throttle lock (D) by pressing it onto the shaft
in the handle (see figure 24).
6
Assemble the handle insert using a screw, when
the throttle control, lever, throttle cable and throttle
control lock with pin are fitted correctly (see figure
25).
Fig 23
Fig 24
English – 23
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Repair instructions
7 Repair instructions
Contents
7.1
7.2
7.3
7.4
7.5
7.6
7.7
7.8
7.9
Starter assembly - removal .............................................................................................25
Changing a broken or worn starter cord .........................................................................26
Tensioning the recoil spring ............................................................................................26
Replacing a worn recoil spring .......................................................................................27
Starter assembly - refitting ..............................................................................................27
Ignition module - testing .................................................................................................27
Ignition module and flywheel - removal ..........................................................................28
Ignition module and flywheel - refitting ...........................................................................29
Centrifugal clutch - removal ............................................................................................30
7.10 Centrifugal clutch - refitting .............................................................................................31
7.11 Dismantling the oil pump and screen ..............................................................................31
7.12 Assembling the oil pump and screen ..............................................................................32
7.13 Air intake system - removal ............................................................................................32
7.14 Assembling the intake system ........................................................................................32
7.15 Carburettor .....................................................................................................................33
7.16 Tank unit .........................................................................................................................42
7.17 Venting the fuel tank .......................................................................................................42
7.18 Vibration damping system ..............................................................................................43
7.19 Replacing the fuel filter ...................................................................................................44
7.20 Replacing the fuel hose/return hose ...............................................................................44
7.21 Replacing the air-purge...................................................................................................44
7.22 Piston and cylinder - removal .........................................................................................45
7.23 Piston and cylinder - refitting ..........................................................................................47
7.24 Cylinder - pressure testing ..............................................................................................49
7.25 Crankshaft complete - dismantling .................................................................................50
7.26 Crankshaft bearings - replacement ................................................................................50
7.27 Crankshaft complete - reassembly .................................................................................51
7.28 Repairing damaged threads ...........................................................................................51
7.29 Replacing the bar bolt .....................................................................................................52
24 – English
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Repair instructions
7 Repair instructions
7.1 Starter assembly – removal
1
Undo the four bolts that fasten the starter assembly
to the crankcase and lift off the starter assembly.
(see figure 1)
Fig 1
2
Pull out about 30 cm of the cord and fasten it in the
notch in the pulley rim. Release the tension in the
return spring by letting the pulley wind backwards
slowly. (see figure 2)
2
1
WARNING!
If the recoil spring is still under
tension when the pulley is re-
moved it can fly out and cause
injury. Wear eye protection.
Fig 2
3
Remove the bolt from the centre of the pulley and
lift off the pulley. (see figure 3)
Cleaning and inspection
Clean the parts and check the following:
•
The starter cord.
•
That the pawls on the flywheel are undama-
ged, i.e. that they spring back towards the
centre and move freely.
•
Lubricate the return spring with light oil.
Fig 3
English – 25
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Repair instructions
7.2 Changing a broken or worn starter
cord
When the starter cord is worn and must be replaced,
the tension on 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 (see figure 2).
WARNING!
If the spring tension is activated
on the starter pulley, the spring
can fly out and cause personal
injury. Wear protective glasses.
2
Undo the bolt in the centre of the pulley and re-
move the pulley (see figure 3).
3
Fit a new cord through the hole in the pulley and tie
a knot to secure it. Feed the other end of the cord
through the hole in the starter housing and through
the starter handle, then tie a double knot in the
end. Wind about 3 turns of the starter cord onto the
pulley. Fit the bolt through the centre of the pulley
and tighten to a torque of 2–3 Nm.
Cleaning and inspection
•
Clean and inspect all parts carefully. If there
are any cracks or other defects replace the
damaged parts with new ones. Lubricate the
return spring with a little grease.
7.3 Tensioning the recoil spring
1
Fasten the starter cord in the notch in the pulley
rim and wind the pulley about 3 turns clockwise.
Check that the pulley is free to rotate at least an-
other half turn when the starter cord is fully exten-
ded (see figure 4).
2
Tension the cord with the handle. Remove the
thumb and released back the cord (see figure 5).
Fig 4
Fig 5
26 – English
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Repair instructions
7.4 Replacing a worn recoil spring
WARNING!
Make sure the recoil spring does
not fly out and cause injury. Wear
eye protection..
1
Remove the bolt from the centre of the pulley and
lift off the pulley and spring cassette.
2
Replace the defective spring cassette with a new
one.
3
Fit the bolt through the centre of the pulley and
tighten to a torque of 2–3 Nm. Tension the recoil
spring, see “Tensioning the recoil spring”.
7.5 Starter assembly – refitting
1
Position the starter assembly on the crankcase and
tighten the bolts to a torque of 2.5–3.5 Nm.
Fig 6
7.6 Ignition module – testing
If there is a fault in the ignition system the ignition
module must be tested before the ignition system
is removed.
Test the ignition module as follows:
•
Connect a test spark plug 502 71 13-01 to the
ignition lead and clip the test spark plug onto
the cylinder.
•
•
Turn the engine over using the starter cord.
Fig 7
If the test spark plug produces a spark the
ignition module is OK. (see figure 7)
English – 27
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Repair instructions
7.7 Ignition module and flywheel
– removal
1
Remove the cylinder cover. Disconnect the HT lead,
remove the spark plug and fit piston stop 502 54 15-
01. in its place. Take off the starter assembly, release
the leads from the cable guide and remove it (see
figure 8).
Fig 8
2
If replacing the ignition module (B), loosen the
cable lug (C) and screw (A) and unscrew it. The
ignition module can be left in place if you are simply
removing the flywheel (see figure 9).
3
Loosen the flywheel nut (E) using a suitable socket
and remove it (see figure 10).
When replacing the cables, they are fitted on the
stop switch, as shown in figure (see figure 9).
Fig 9
4
Knock on the punch using a metal mallet until
the flywheel releases from the shaft. Remove the
punch and the flywheel (see figure 10).
Cleaning and inspection
•
Clean all parts, especially the tapers on the
flywheel and shaft.
•
Check that the flywheel is not cracked or da-
maged in any other way.
Fig 10
28 – English
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Repair instructions
7.8 Ignition module and flywheel
– refitting
1
Fit the flywheel on the crankshaft journal. Turn the
flywheel so that the key lines up with the keyway in
the shaft.
Fit the nut on the shaft and tighten to a torque of
25-30 Nm (see figure 11).
Fig 11
2
To refit the ignition module proceed as follows:
Turn the flywheel so that the magnets are in line with
the ignition module. Fit the ignition module with the
plastic feeler gauge (502 51 34- 02) held in position
at the same time, without tightening the bolts. Fit the
earth cable (black) (A). Set a distance of 0.3 +/- 0.1
mm, between the ignition module and magnet. The
measurement applies to the two lowest lugs on
the ignition module. Tighten the screws, tightening
torque 4.5–6 Nm. Fit the blue cable on the ignition
module (see figure 12).
Fig 12
3
Then refit:
•
•
•
cable guide and press the leads into position
HT lead
starter assembly, tighten to a torque of 2.5–3.5
Nm
•
cylinder cover
When replacing the cables, they are fitted on the
stop switch as shown in middle figure on the pre-
vious page.
English – 29
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Repair instructions
7.9 Centrifugal clutch – removal
1
Remove the cylinder cover. Disengage the chain
brake by pushing the kickback guard backwards.
Undo the bar nut and remove the clutch cover, bar
and chain (see figure 13).
2
Disconnect the HT lead. Remove the spark plug
and fit piston stop 502 54 15-01 (A) in its place
(see figure 14).
Fig 13
3
Unbolt the clutch using tool 502 54 16-03 (B) and
a suitable socket or wrench. Turn the clutch clock-
wise to remove it (see figure 15).
A
Fig 14
4
Secure the clutch in a vice as shown in figure. Care-
fully release the clutch springs (C) (see figure 16).
B
NOTE!
Handle the clutch springs carefully. If they
are opened up too much they could dam-
age the saw.
Fig 15
Inspection and cleaning
•
Clean and inspect all parts carefully. If there
are any cracks or other defects replace the
damaged parts with new ones. Always use
original parts.
•
Check the thickness of the clutch shoes by
using vernier callipers to measure the diameter
of the clutch. If the diameter is less than 60
mm the clutch assembly must be replaced (see
figure 16).
Fig 16
30 – English
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Repair instructions
7.10 Centrifugal clutch – refitting
1
Insert the clutch springs in the shoes.
2
Screw the clutch (anti-clockwise) until it stops.
Now tighten using tool 502 54 16-03 and a suitable
socket wrench or combination spanner. Tightening
torque min. 20 Nm.
3
Remove the piston stop. Fit the spark plug, tightening
it to a torque of 20 Nm, then connect the HT lead.
Then refit:
•
•
•
•
cylinder cover
guide bar
chain
clutch cover
Fig 17
7.11 Dismantling the oil pump and
screen
1
Empty and clean the oil tank.
Remove the cylinder cover. Release the brake by
moving the front hand guard backward. Undo the
bar nut and remove the clutch cover, bar and chain.
Loosen spark plug cap and remove the spark plug,
fit the piston stop 502 54 15-01. Loosen the clutch
(clockwise) using tool 502 54 16-03 and a suitable
socket wrench or combination spanner.
Fig 18
2
Remove the centrifugal clutch (A). Remove the
clutch drum (B), needle bearing (C) and pump
drive wheel (D) (see figure 17).
3
Unscrew the chain guide plate (see figure 18).
4
Unbolt the oil pump from the crankcase and
remove it together with the oil pressure hose (see
figure 19).
E
Fig 19
5
The oil pump (E) is not adjustable (see figure 20).
E
Cleaning and inspection
•
•
Clean and inspect all parts carefully. If there are
any cracks or other defects replace the dama-
ged parts with new ones. Always use original
parts.
Lubricate all moving parts with chain oil.
Fig 20
English – 31
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Repair instructions
7.12 Assembling the oil pump and screen
7.14 Assembling the intake system
1
Fit the chain guide plate with tightening torque
1–1.5 Nm.
1
Fit the intake manifold (A) and the partition walls
(B and C) on the cylinder using tool 502 50 87-01
(see figure 21).
Fit the drive gear, needle bearing, clutch drum and
the clutch (min. 20 Nm).
Fit the chain, bar and clutch cover.
Cleaning and inspection
WARNING!
Clean and check all parts carefully. Parts must be
replaced if cracked or show signs of other defects.
Always use original spare parts.
Poor chain lubrication can result
in failure of the chain, which could
cause serious or fatal injury.
7.13 Air intake system – removal
The air intake system comprises:
•
•
•
intake manifold (A)
plastic partition wall (B)
rubber partition wall (C)
(see figure 21)
1
Now loosen the screws using tool 502 50 87-01..
Fig 21
32 – English
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Repair instructions
7.15 Carburettor
WARNING!
The fuel used in the chainsaw has
the following hazardous properties:
1.The fluid and its fumes are
poisonous.
2. Can cause skin irritation.
3. Is highly inflammable.
Description
The drawings accompanying this description do not
correspond with the carburettor on the chainsaw.
They only show the principle for the design and
function.
Design
The carburettor is based on three sub-systems:
•
•
•
The metering unit, A.
The mixing venturi, B.
The pump unit, C.
Fig 22
The jets 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 figure 22).
The mixing venturi (B) houses the choke, throttle
valve and diffuser jets. Here air is mixed with the
fuel to give a fuel/air mixture that can be ignited by
the ignition spark (see figure 23).
Fig 23
In the pump unit (C), fuel is pumped from the fuel
tank to the metering unit. One side of the pump di-
aphragm 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 figure 24).
Fig 24
English – 33
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Repair instructions
Function
The carburettor operates differently in the following
modes:
•
•
•
•
Cold start mode
Idling mode
Part throttle mode
Full throttle mode
In the cold start mode (see figure) the choke valve
(H) is fully closed. This increases the vacuum in
the carburettor so that fuel is sucked more easily
from all the diffuser jets (D, E and F). The throttle
valve (I) is partly open. Extra air inlet (J) is closed
(see figure 25).
Fig 25
In the idling mode (see figure) the throttle valve (I
and J) is 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 th-
rough the diffuser jet (D) (see figure 26).
Fig 26
In the part throttle mode (see figure below) the th-
rottle valve (I) is partially open and the choke valve
(H) is open. Fuel is supplied through the diffuser
jets (D and E). The throttle valve (J) starts to open
(see figure 27).
Fig 27
In full throttle mode (se figure below) all valves
are open and fuel is supplied through all diffuser
jets (D, E, F and G). Extra air inlet (J) is also fully
opened (see figure 28).
Fig 28
34 – English
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Repair instructions
Dismantling the carburettor
1. Dismantle the cylinder cover and the air filter.
2. Disassemble the handle holder (see figure 29).
Fig 29
3. Push the throttle actuator rod out of the han-
dle part. Unhook it from the carburettor (see
figure 30).
Fig 30
4. Remove the return hose (B) and suction hose
(C). Loosen the fuel pump (D). Let the fuel
hose (G) remain in place (see figure 31).
NOTE!
Take care when lifting out the carburettor so
that the fuel hose does not become loose.
Fig 31
5. Loosen the screws (E) and unhook the rubber
mountings (F) (see figure 32).
Fig 32
English – 35
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Repair instructions
6. Disassemble the pump cover (G) over the
measuring chamber cover (R) and carefully
remove the control diaphragm (H) with gasket
(J).
7. Unscrew the screw (K) and remove the needle
valve (L) with lever (M), shaft (N) and spring
(P).
8. Unscrew the screw (Q) above the pump unit
and carefully remove the gasket (S) and dia-
phragm (T).
9. Use a needle or similar device and carefully
pull up the fuel screen (U).
10. Unscrew the high (V) and low jet screws (W)
(see figure 34).
11. If necessary, dismount the throttle valve (X),
choke valve (Z) and air shutter (Y) and remove
the shafts with levers and springs (see
figure 34).
Fig 33
36 – English
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Repair instructions
Cleaning and inspection
Clean all units in clean petrol.
5. That the tips of the high (V) and low jet screws
(W) are not damaged (see figure 34).
6. That the intake manifold (R2) is undamaged
(see figure 33).
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:
7. The carburettor has an extra air shutter con-
nected in parallel with the ordinary throttle
valve.
1. That gaskets, pump and control diaphragms
are undamaged.
2. That there is no play on the throttle and choke
valve shafts.
3. That the needle valve (L) and its lever (M) are
not worn (see figure 33).
4. That the fuel screen (U) is whole and clean
(see figure 33).
Fig 34
English – 37
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Repair instructions
Assembly
Maintain a high level of cleanliness when assem-
bling the carburettor. The slightest contamination
can result in running problems.
1. If the throttle and choke valves, together with
levers and springs were removed, they should
be refitted. The spring is tensioned 1-2 turns.
Lubricate the shaft bearings with light oil.
2. Fit the high (V) and low (W) speed needles and
springs. Note! Do not fully tighten the screws.
This will damage the seats and needle tips.
3. Fit the fuel filter (U) by using the handle of a
small screwdriver. (see figure 33)
4. Fit pump cover (G), gasket (S) and measuring
chamber cover (R) over the pump unit (see
figure 33).
Fig 35
5. Fit the needle valve (L) with lever (M), shaft (N)
and spring (P) and tighten the screw (K). Fit
the expansion washer (F) (see figure 35).
6. Check using a ruler or the like that the lever
is level with the assembly plane on the cover.
The lever arm can be bent if necessary (see
figure 36).
Fig 36
7. Fit the control diaphragm (T) with gasket (S)
and measuring chamber cover (R) over the
metering unit (see figure 37).
8. Press in the screen (U). Fit the measuring
chamber cover (R) and tighten the screw (Q)
(see figure 37).
9. Put together the gasket (J) and control dia-
phragm (H) and press up (see figure 37).
10. Assemble all the parts and tighten the four
screws (see figure 37).
11.. Carry out a pressure test.
Fig 37
38 – English
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Repair instructions
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 it can also be carried out as trouble shooting
before dismantling the carburettor.
See figure and carry out the test as follows:
1
Set the high and low jet screws two turns from
the bottom.
Fig 38
2
Connect pressure tester to the carburettor’s fuel
intake.
3
Lower the carburettor into a beaker of water (see
figure 37).
4
Pump the pressure up to 50 kPa.
5
No leakage is permitted. If a leakage occurs refer
to the table below.
Leakage at
Fault with
Diffuser jets
Needle valve
Pump diaphragm
Leakage in impulse tube
Ventilation hole
on metering unit.
Control diaphragm
English – 39
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Repair instructions
Assemble on the saw
1. Press the carburettor down towards the parti-
tion wall. Make sure that it gets into the correct
position.
2. Fit the filter holder by hooking the choke con-
trol into the choke lever (A).
3. Hook on the rubber mountings. Insert and
tighten the screws.
Fig 39
4. Insert the return hose (B) into its position in the
filter holder.
5. Press on the fuel diaphragm (D). Fit the suc-
tion hose (C) and return hose (B).
Fig 40
6. Hook in the throttle actuator rod into the carbu-
rettor. Thread the handle holder into the throttle
actuator rod (A). Push the rod forwards so that
it can be inserted into the handle part.
7. Push down the handle holder into the filter
holder (see figure 42).
Fig 41
8. Assemble the air filter and cylinder cover.
9. Mount the handle holder.
Fig 42
40 – English
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Repair instructions
Carburettor adjustment
Conditions during adjustment
•
The air filter should be clean and the cylinder
cover fitted when adjustments are made. Ad-
justing the carburettor with a dirty air filter will
give a too lean fuel mixture the next time the
air filter is cleaned. This can result in serious
damage to the engine.
•
•
Mount, for this model, approved bar and
chain combination (see Technical data in the
Operator's Manual).
Fig 43
CS 2240/S 16"
The chain should not be tensioned more than
that it remains ~ 0,2 inches to the bar.
(See figure 43)
Replacement of the H-needle or complete car-
burettor
1. Carefully screw the new H-needle to the bot-
tom and turn it anticlockwise ”A” turns.
CS 2240/S A = 2
2. Start the engine. If necessary, adjust the idling
speed with the T-screw until the chain stops.
3. Adjust the H-needle to give a top speed of ”B”
rpm. Use a tachometer.
CS 2240/S B = 12500-13 000, speed limitation
Use screwdriver 530 03 55-60.
L
H
4. Let the engine run at ”B” rpm ~ 1 minute, until
warm.
Replacement of the L-needle
1. Screw the new L-needle to the bottom and
then turn it counterclockwise ”D” turns.
T
Fig 44
CS 2240/S D = 2,5
(See figure 44)
English – 41
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Repair instructions
7.16 Tank unit
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.
Dismantling
1. Drain the fuel from the tank.
2. Dismantle the cylinder cover, bar and chain.
See the Operator's Manual.
3. Unhook the throttle actuator rod (G) from the
carburettor (see figure 45).
Fig 45
4. Dismantle the fuel hose (B) and the fuel pump
return hose (D) (see figure 45).
5. Remove the screws. (A). Loosen the handle
(see figure 46).
6. Dismantle the fuel tank.
NOTE!
Exercise care so that the fuel hose and
throttle cable are not damaged.
7.17 Venting the fuel tank
The two-way valve (C) has the following properties
(see figure 47):
•
Controlled opening pressure in both directions,
which prevents a positive pressure or a vacuum
developing in the fuel tank and impairing engine
performance. This also prevents fuel leakage.
3xA
•
•
Opening pressure outward 100–450 mbar.
Opening pressure inward (vacuum) max.
70 mbar. (2 positions)
A
2xE
Test
A
Fig 46
Opening pressure outward:
1. Open the filler cap and let the cap remain open
during the entire test. Drain the fuel from the
tank.
2. Connect the pump, ref. no. 531 03 06-23, to
the tank valve. (C)
3. Switch the pump to vacuum mode.
4. After pumping the indicator should be between
10–45 kPa.
Opening pressure inward:
1. Open the filler cap and let the cap remain open
during the entire test. Drain the fuel from the
tank.
2. Connect the pump, ref. no. 531 03 06-23, to
the tank valve. (C)
Fig 47
3. Switch the pump to pressure mode.
4. After pumping the indicator should stop at max.
7 kPa.
42 – English
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Repair instructions
Assembly
1. If the throttle lock has been removed, this must
be assembled before the tank unit and engine
unit are assembled.
2. Lift the engine unit above the tank unit and
insert the fuel hose (in J), return hose (in H) in
the bottom of the carburettor compartment (see
figure 48).
3. Fit the handle with the screws (A). Tighten the
screws with the torque set out in the service
data (see figure 46).
Fig 48
4. Fit the fuel hose (B) and fuel pump return hose
(D) on the carburettor (see figure 45).
5
6
Mount the throttle actuator rod (see figure 45).
Assemble the cylinder cover, bar and chain.
See the Operator's Manual.
7.18 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.
Fig 49
2. Dismantle the spring on the cylinder with the
help of a 5 mm allen key (see figure 49).
3. Dismantle the springs on the tank unit with the
help of a 5 mm allen key (tool 502 50 18-01)
(see figure 50).
Cleaning and inspection
Clean and inspect all parts.
Assembly
1. Assemble the springs on the cylinder with the
help of a 5 mm allen key (tool 502 50 18-01).
Note! Springs with a greater resistance are av-
ailable, but should only be used together with
a longer bar. See illustrated part list for spare
part number.
Fig 50
2. Assemble the following parts:
•
•
•
Tank unit and handle.
Cylinder cover. See the Operator's Manual.
Bar and chain. See the Operator's Manual.
English – 43
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Repair instructions
7.19 Replacing the fuel filter
NOTE!
Do not use knurled pliers to disconnect or
reconnect the fuel hose.This could dam-
age the hose and lead to leakage or frac-
ture.
1
First remove the old fuel filter from the tank unit
using special tool 502 50 83-01.
2
Pull the fuel hose (B) out of the tank unit and pull
off the filter.
3
Fit the new fuel filter (A) and feed the fuel hose
back into position.
7.20 Replacing the fuel hose/
return hose
The fuel hose is moulded and can only be removed
from outside of the fuel tank.
Fig 51
Use suitable pliers with a plain cutting face and
loosen the hose (B) (see figure 45) from the fuel
tank. Align the cut-out against the plastic pin when
assembling. Replace the return hose when required.
7.21 Replacing the air-purge
Dismantling
1. Dismantle the cylinder cover and the air filter.
2. Loosen the suction hose (C) and return hose
from the fuel pump (see figure 31).
3. Unsnap the fuel pump from the filter holder.
Assembling
1. Fit the return hose on the fuel pump.
2. Snap the purge into the filter holder (see figure
51).
Fig 52
4. Assemble the air filter and cylinder cover.
44 – English
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Repair instructions
7.22 Piston and cylinder – removal
1
Remove:
•
•
•
•
•
cylinder cover
carburettor (see “Carburettor – removal”)
silencer
spark plug
fuel unit
2
Undo the four cylinder bolts from the underside and
lift the cylinder off carefully (see figure 52).
Fig 53
3
Cover the opening in the crankcase (see figure 54).
4
Remove the circlips from the ends of the gudgeon
pin and press it out. Then lift off the piston (see
figure 53 and 54).
5
Remove the little end bearing (see figure 54).
Fig 54
If replacing the cylinder:
Remove the intake manifold, see “Air intake sys-
tem – removal”.
Fig 55
Cleaning and inspection
Clean all the components, scraping off all traces of
old gasket and carbon from the following places:
•
•
•
•
•
Piston crown
Top of the cylinder bore
Cylinder exhaust port
Decompression valve channel
Cylinder base and/or crankcase
(see figure 56)
Fig 56
English – 45
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Repair instructions
Check the following:
•
The surface coating of the cylinder is not worn
through, especially in the upper part of the
cylinder.
•
•
The cylinder is free from score marks and
areas of wear.
The piston is free from score marks. Small
scratches can be polished out with fine emery
paper.
•
The piston ring is freely moving in its groove.
(see figure 57)
Fig 57
•
Measure piston ring wear. This should not
exceed 1 mm (see figure 58). Use the piston to
push the piston ring for correct alignment.
•
•
•
The needle roller bearing is undamaged.
The intake manifold is undamaged.
That the air hoses and impulse hose are unda-
maged.
•
Pressure test the decompression valve.
Fig 58
46 – English
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Repair instructions
Faults and causes
B
A
Score marks on the piston (A)
1. Incorrect carburettor setting. Too high over-
speed.
2. Too low octane fuel.
3. Too low or incorrect oil in the fuel.
Carbon build-up (B)
1. Incorrect carburettor setting. Too low over-
speed.
Fig 59
2. Too much or incorrect oil in the fuel.
Piston ring breakage
1. Excessive engine speed.
2. Piston ring worn out.
3. Oversized piston ring groove.
(See figure 59)
7.23 Piston and cylinder – refitting
1
Lubricate the little end bearing with two-stroke oil
and insert it in the connecting rod (see figure 60).
2
Fit the piston with the arrow pointing towards the
exhaust port. Push the gudgeon pin in and fit the
circlips. NOTE! Use new wire fuses (see figure 60).
3
Fit the intake manifold on the cylinder, with insula-
ting plate (4 screws).
Fig 60
4
Lubricate the piston ring and piston with two-stroke
oil.
5
Fit new cylinder base gaskets. Lower the cylinder
over the piston carefully.
6
Fit the cylinder bolts, tightening them in diagonal
pairs to a torque of 13–15 Nm.
NOTE!
Fig 61
It is very important that there are no leaks
in the inlet system, otherwise the engine
may seize.
English – 47
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Repair instructions
Inlet manifold
The intake system has two intakes.
1. The lower intake leads the fuel and air mixture
from the carburettor to the cylinder.
2. The upper intake leads air to the cylinder.
Assembling the intake system
1
Mount the intake manifold (A) and the partition
walls (B and C) on the cylinder using tools 502 50
87-01 (see figure 62).
Fig 62
48 – English
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Repair instructions
7.24 Cylinder – pressure testing
1
Remove:
•
•
•
cylinder cover
carburettor
spark plug
2
Mount cover plate 502 54 48-02 (see figure 63).
3
Fig 63
Loosen the screws on the muffler and press the
rubber sheet 502 54 11-02 between the muffler and
cylinder. Tighten the top two muffler screws (see
figure 64).
4
Fit the pressure testing spark plug 503 84 40-02
and connect the pressure testing tool 531 03 06-23
(see figure 64).
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
specified torque. Remove the pressure test nipple
503 84 40-02 and refit the spark plug.
Fig 64
WARNING!
After pressure testing the cylinder,
check that the inlet manifold is
seated correctly, otherwise the saw
may be damaged.
Fig 65
English – 49
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Repair instructions
7.25 Crankshaft complete - dismantling
1
Remove the following:
• chain and bar
• clutch cover
• cylinder cover
• starter assembly*
• centrifugal clutch*
• carburettor*
• silencer*
• handle system
• hand guard
Fig 66
• piston and cylinder*
* See special instructions.
2
Lift the crankshaft completely out of the crankcase
(see figure 66).
7.26 Crankshaft bearings – replacement
Remove:
•
The crankshaft complete from the crankcase.
1
Pull the crankshaft bearing off of the crankshaft
using a bearing puller (see figure 67).
Fig 67
2
Place a new bearing on the shaft and push into
position using tool 502 50 30-22 (see figure 68).
Fig 68
50 – English
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Repair instructions
7.27 Crankshaft complete – reassembly
1
Fit the crankshaft complete in the crankcase.
Refit the following parts:
•
•
•
•
•
•
•
•
•
•
piston and cylinder*
handle system
hand guard
silencer*
carburettor*
centrifugal clutch*
starter assembly*
cylinder cover
clutch cover
chain and bar
* See special instructions.
7.28 Repairing damaged threads
A repair kit, 503 27 33-01, is available for repairing
damaged threads.
First drill out the hole using:
6,1 mm drill bit for plastic crankcase
Then screw in the thread insert using a suitable
bolt and spanner.
Fig 69
This type of thread insert is best suited for use
in plastic and magnesium, but not for repairing
threads in aluminium. In that case use a helicoil
insert with metric screw (see figure 69).
English – 51
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Repair instructions
7.29 Replacing the bar bolt
Replacing the front bar guide.
1
Drain the oil tank.
2
Knock through the old guide bar bolt so that it falls
into the oil tank.
3
Remove the bolt from the oil tank.
4
Secure steel wire to the outer part of the bar bolt
(A), thread the steel wire through the oil tank and
out through the bolt hole in the crankcase (see
figure 70).
Fig 70
5
Pull the steel wire so the bolt comes out of its hole
(see figure 71).
6
Check that the bolt's square head fits in
the washer (D) which is positioned in the cut-out in
the crankcase.
7
Pull out the bar bolt with its nut. Place a spacer
between the nut and crankcase (see figure 71).
8
Refill with chain oil.
Fig 71
Replacing the rear bar guide
1
Pull out the bar guide (C) with the help of slip-joint
pliers (see figure 70).
2
Fit the bar guide with the help of a hammer.
52 – English
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Troubleshooting
8 Troubleshooting
Contents
8.1
8.2
Troubleshooting ..............................................................................................................54
Troubleshooting methods ...............................................................................................55
English – 53
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Troubleshooting
8.1 Troubleshooting
The various faults that can affect a chainsaw are divided into four groups. In each group the likely
symptoms are given on the left and possible causes are listed on the right. The most likely faults are given
first, and so on.
Starting
Idling (low rpm) (cont.)
Difficulty starting Adjust L screw
Air filter blocked
Idles when L
screw closed
Worn needle valve
Leaking control diaphragm/cover
plate
Needle valve assembly sticking
Worn needle valve lever
Faulty diffuser jet
Choke not working
Worn choke pivot
Worn choke valve
Fuel filter blocked
Fuel line blocked
Piston ring seized
Blocked impulse channel
Idling uneven
Fuel filter blocked
Fuel line blocked
Leaking air intake hose (rubber)
Loose carburettor mounting
bolts
Worn throttle valve pivot
Loose throttle valve screw
Worn throttle valve
Needle valve assembly sticking
Leak in metering system (air
or fuel)
Carburettor
leaking fuel
Loose or faulty fuel pipe
Hole in diaphragm
Worn needle valve
Needle valve assembly sticking
Needle valve set too high
Leak in metering system (air
or fuel)
Loose cover on carburettor
pump side
Metering system centre knob
is worn
Flooding when
engine not
running
Worn needle valve
Needle valve set too high
Needle valve assembly sticking
Hole in diaphragm
Leaking control diaphragm/cover
plate
Crankcase leaking
L screw requires Fuel line blocked
constant adjust-
ment
Idling (low rpm)
Needle valve set too high
Needle valve assembly sticking
Leak in metering system (air
or fuel)
Adjust L screw
Will not idle
Leaking air intake hose (rubber)
Loose carburettor mounting
bolts
Loose or faulty fuel hose
Fuel filter blocked
Fuel line blocked
Leaking control diaphragm/cover
plate
Faulty diffuser jets
Crankcase leaking
Fuel tank vent blocked
Throttle valve pivot stiff
Throttle pushrod sticking
Defective throttle return spring
Bent throttle stop
Too much fuel at Needle valve set too high
idling
Needle valve assembly sticking
Metering system damaged
Worn needle valve
Leaking control diaphragm/cover
plate
Faulty diffuser jet
Metering system incorrectly
assembled
Adjust L screw
Worn needle valve
Idling too rich
Needle valve set too high
Worn needle valve lever
Leaking control diaphragm/cover
plate
Needle valve assembly sticking
54 – English
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Troubleshooting
High rpm
Acceleration och retardation
Does not
accelerate
Adjust L screw
Adjust H screw
Blocked air filter
Blocked fuel tank vent
Blocked fuel filter
Fuel line blocked
Loose or damaged fuel hose
Impulse channel blocked
Loose cover on carburettor pump
side
Will not run at Adjust H screw
full throttle
Blocked air filter
Blocked fuel tank vent
Blocked fuel filter
Fuel line blocked
Loose or damaged fuel hose
Impulse channel leaking
Impulse channel blocked
Loose cover on carburettor pump
side
Faulty pump diaphragm
Leaking air intake hose (rubber)
Loose carburettor mounting bolts
Needle valve set too low
Metering system incorrectly
assembled
Needle valve assembly sticking
Faulty diffuser jets
Blocked silencer
Faulty pump diaphragm
Leaking air intake hose (rubber)
Loose carburettor mounting bolts
Needle valve set too low
Metering system damaged
Metering system incorrectly
assembled
Leaking control diaphragm/cover
plate
Needle valve assembly sticking
Blocked silencer
Adjust L screw
Adjust H screw
Faulty pump diaphragm
Needle valve set too high
Needle valve assembly sticking
Faulty diffuser jets
Engine stalls
when throttle
released
Low power
Adjust H screw
Blocked fuel tank vent
Blocked fuel filter
Impulse channel leaking
Impulse channel blocked
Loose cover on carburettor pump
side
Adjust L screw
Adjust H screw
Blocked air filter
Faulty pump diaphragm
Faulty diffuser jets
Over rich
acceleration
Faulty pump diaphragm
Blocked air filter
Needle valve assembly sticking
Leak in metering system (air or
fuel)
Metering system incorrectly
assembled
Loose diaphragm rivet
Hole in diaphragm
Leaking control diaphragm/cover
plate
8.2 Troubleshooting methods
In addition to the faults described in the above
table, trouble shooting can be carried out on
specific components or sub-systems of the
chainsaw. The various procedures are described
in the relevant chapters, see the contents page, as
follows:
Will not “four- Blocked fuel tank vent
stroke”
Blocked fuel filter
Fuel line blocked
Loose or damaged fuel hose
Impulse channel leaking
Impulse channel blocked
Loose cover on carburettor pump
side
Faulty pump diaphragm
Leaking air intake hose (rubber)
Loose carburettor mounting bolts
Needle valve set too low
Leak in metering system (air or fuel)
Metering unit incorrectly assembled
Loose diaphragm rivet
Hole in diaphragm
•
•
•
•
•
Checking the operation of the chain brake
Measuring the resistance of the stop plate
Pressure testing the carburettor
Pressure testing the decompression valve
Pressure testing the cylinder
Leaking control diaphragm/cover
plate
English – 55
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2009W39
510 16 77-26
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