For Husqvarna Parts Call 606-678-9623 or 606-561-4983
Brush Cutters, Trimmers,
Pruners, Pruning saws,
Hedge trimmers, Ice drills,
Blowers
Workshop Manual
101 90 75-26
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Supplement to the workshop
manual for
brush cutters, trimmers
pruners, pruning saws, hedge
trimmers, ice drills, blowers
1999
Contents
General recommendations ______________________ 2
1. Starter ___________________________________ 3
2. Ignition system ___________________________ 11
3. Fuel system _____________________________ 19
4. Centrifugal clutch _________________________ 37
5. Angle gear_______________________________ 45
6. Cylinder and piston ________________________ 51
7. Crankshaft and crankcase __________________ 63
8. Hydraulic unit ____________________________ 75
9. Attachments _____________________________ 79
10. Tools ___________________________________ 91
The supplement includes new products and modifications to products after the
Workshop Manual was printed in March 1997.
For complete information when servicing we recommend that the supplement is
studied together with the Workshop Manual.
(Order number 101 90 74-26)
© Copyright Husqvarna AB, Sweden 1999
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1
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General recommendations
The workshop used to carry out repairs must be equipped with
safety devices in accordance with local directives.
No one may carry out repairs without first having read and
understood the contents of this Workshop Manual.
The boxes below can be found in appropriate parts of this
manual.
WARNING!
!
NOTE!
This box warns of damage to material if the instructions are
not followed.
The machine is type approved for safety in accordance with
applicable legislative demands with the equipment specified in
the Operator’s Manual. The assembly of other equipment or
accessories or spare parts not approved by Husqvarna can
result in the failure to meet these safety demands and that the
person carrying out assembly bears responsibility for this.
The warning box warns of the risk for personal
injury if the instructions are not followed.
Bear in mind:
● Do not start the engine without the clutch drum and shaft
fitted. Otherwise there is a risk that the clutch can become
loose and cause personal injury.
● Do not touch hot components, e.g. the muffler and clutch
before they have cooled sufficiently to avoid burns.
● Avoid getting fuel or oil on your skin or in your mouth.
Use barrier cream on your hands. This reduces the risk of
infection and makes dirt easier to wash off.
Long term contact with engine oil can represent a health
hazard.
● Never start the engine indoors. Exhaust fumes are poisonous!
● Wipe up oil spills from the floor immediately to avoid
slipping.
● Do not use tools that are worn or fit badly, for example on
nuts and screws.
● Always work on a clean bench.
● Always work logically to ensure all parts are fitted correctly
and that nuts and screws are tightened.
● Use the special tools where recommended in order to
carry out the work correctly and efficiently.
Fire risk
Handle fuel with respect, as it is extremely inflammable.
Do not smoke and ensure there are no open flames or sparks
in the vicinity.
Make sure there is a working fire extinguisher close at hand.
Do not try to extinguish a petrol fire with water.
Poisonous fumes
When using cleaning agents read the instructions carefully.
Ensure there is good ventilation when handling petrol and other
volatile fluids.
The engine’s exhaust fumes are poisonous. Test run the engine
outdoors.
Special tools
Some of the work described in the Workshop Manual requires
special tools. In each section where this is necessary there is
a picture of the tool and an order number.
We recommend the use of special tools in order to avoid
personal injury and to eliminate expensive damage to the parts
in question.
502 51 03-01
Contact faces and gaskets
Ensure all surfaces are clean and free from gasket residue.
When cleaning use a tool that will not damage the contact face.
Any scratches or unevenness should be removed using a flat
fine cut file.
Sealing rings
Always replace a sealing ring that has been dismantled. The
sensitive sealing lip can easily be damaged resulting in inferior
sealing capacity. Surfaces that the seal shall seal against must
also be completely undamaged. Lubricate the sealing lip with
grease before it is fitted and ensure that it is not damaged e.g.
by shoulders and splines on a shaft. Use tape or a conical sleeve
as protection. It is important that the sealing ring faces in the
right direction for it to act as it is intended.
2
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Starter
1.
Contents
Models 322, 325
Dismantling, assembling___________________________ 4
Replacing the drive dogs __________________________ 5
Models 32, Mondo, Mondo Mega
Dismantling, assembling___________________________ 6
Model 18H
Dismantling _____________________________________ 6
Assembly ______________________________________ 7
Models 140B, 141B
Dismantling, assembling___________________________ 8
Assembly
General ________________________________________ 9
Replacing the drive dogs _______________________ 10
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1
Starter
Models 322, 325
Dismantling
Remove the 3 screws and lift off the starter.
NOTE!
Ensure the bushings (A) that guide the starter towards the fuel tank are not lost.
A
Offload the spring tension.
Remove the screw from the centre of the
starter pulley and lift off the starter pulley.
Offload the spring tension in the same
way as described for model 265.
Remove the screw in the centre of the
starter pulley. Carefully lift out the starter
pulley from the starter housing.
Assembly
Clean the component parts and assemble
in the reverse order as set out for dismantling.
Assemble the starter pulley.
Assemble a new starter cord.
NOTE!
A new starter cord can be fitted
without the need of dismantling
the starter!
WARNING!
!
Assembly
Clean component parts before assembling.
Replace the return spring/starter pulley
and starter cord, if necessary.
NOTE!
The return spring and starter
pulley are supplied pre-assembled
and are fitted in the starter
housing as a single unit.
Exercise care when opening the
packaging so that the spring does
not fly out.
Lubricate the spindle with a little grease
and fit the starter pulley.
Position the washer and tighten the screw.
Assemble a new starter cord. Slide it into
the starter pulley’s slot as illustrated and
then out through the cord guide in the
starter housing.
Make sure the knot on the end of the cord
is as small as possible!
Wear protective glasses.
The return spring lies
tensioned in the starter
and can fly out and cause
personal injury with
careless handling.
4
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Starter
Assemble the starter handle. Assemble the starter handle in the same
way as described for model 265, but tie a
double knot, as the cord is lighter.
Tension the return spring.
Check the spring tension.
Fit the starter on the engine body.
Do not forget the guide sleeves for the fuel
tank.
Tension the return spring. Pull out the
starter cord fully and lift it out of the cutout in the starter pulley.
Now turn the starter pulley anticlock-
wise, 6 turns.
Check the spring tension. With the starter
cord fully extended it should still be possible to turn the starter pulley further,
least a half turn.
1
at
Replacing the drive dogs
Dismantle the drive body.
504 91 06-05
Remove the circlip and replace any damaged drive dogs or springs, if necessary.
Replacing the drive dogs
Fit the piston stop no 504 91 06-05 in the
spark plug hole and loosen the nuts holding the drive body.
Remove the circlip holdings the drive
dog.
Lift out the drive dog and spring for replacement.
Assemble in the reverse order as set out
for dismantling.
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1
Starter
Models 32, Mondo,
Mondo Mega
Dismantling
Disconnect the electrical cables.
Remove the shaft complete with handle.
Dismantle the starter.
Models 32, Mondo,
Mondo Mega
Dismantling
Disconnect the electrical cables by the
engine body and remove the 4 screws
(models Mondo and Mondo Mega have 3
screws) that hold the shaft and handle on
the starter housing.
Lift off the shaft.
Remove the 4 screws and lift off the
starter.
Model 32
Pull out the electrical cables from the starter
housing using flat nose pliers.
Model Mondo
Also dismantle the screw by the spark
plug.
Assembly
Assemble the starter handle.
Model 18H
Dismantling
Dismantle the air filter, throttle cable and
carburettor.
Remove the 4 screws holding the engine
body and gear housing.
Assembly
Assemble the starter handle in the same
way as described for model 265.
Tie a double knot, as the cord is lighter
than on model 265.
Model 18H
Dismantling
The starter is positioned between the
crankcase and the cutting equipment
drive.
First dismantle the spark plug, air filter,
throttle cable and carburettor.
Turn the trimmer upside down so that the
screws holding the engine body are accessible.
Remove the 4 screws.
6
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Starter
Dismantle the centrifugal clutch.
504 91 06-06
Dismantle the starter from the engine.
1
Assemble the piston stop no. 504 91 0605 in the cylinder.
Unscrew the centrifugal clutch. First
loosen it using a hammer and punch,
anticlockwise.
Dismantle the starter.
Remove the 5 screws holding the starter
housing
Lubricate the ignition cable with a few
drops of oil and remove the rubber grommet in the cover.
Lift off the starter housing.
The following procedures are the same as for models 32, Mondo:
Remove the locking plates holding the starter pulley axially.
Offload the spring tension.
Dismantle the starter pulley and spring cassette from the starter housing.
Assembly (also see model Mondo)
Place a new spring cassette in position in the starter housing.
Replace the cord and attach as illustrated.
Assemble the starter pulley.
Assemble the starter handle (see model 265).
Tension the return spring.
Repeat tensioning the spring and fit the locking plates.
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1
Starter
Models 140B, 141B
Dismantling
Remove the screws and lift off the starter.
Offload the spring tension and remove
the starter pulley from the starter housing.
Models 140B, 141B
Dismantling
Remove the 4 screws holding the starter
against the engine body.
Lift the starter cord out of the cut-out in
the starter pulley.
Offload the spring tension by allowing the
starter pulley to rotate backwards. Stop
the pulley using your thumb.
Remove the screw and washer from the
centre of the starter pulley.
Lift off the starter pulley.
Dismantle the return spring.
Clean and replace any damaged parts.
Assembly
Fit a new return spring in the starter
housing.
Carefully lift off the starter pulley and
return spring.
WARNING!
!
The return spring lies tensioned in the
starter housing and can fly out and cause
personal injury with careless handling.
Clean and replace any damaged parts.
Assembly
Fit a new return spring in the starter
housing. Exercise great care so that it
does not fly out.
!
Use protective
glasses.
WARNING!
Use protective
glasses.
Check that the spring’s mounting is facing the right way!
8
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Starter
Replace the starter cord and attach as
illustrated.
Wind the cord 4 turns clockwise around
the starter pulley.
Lubricate the spindle and return spring
and assemble the starter pulley.
Assemble the starter handle.
1
Attach a new starter cord in the starter
pulley as illustrated.
Wind the cord 4 turns clockwise around
the starter pulley.
Lubricate the spindle and return spring
with a few drops of oil.
Place the starter pulley in position and
tighten the screw in the centre. Do not
forget the washer.
Assemble the starter handle.
The collar on the washer should face
towards the starter handle.
Tension the return spring.
Check that the pulley can be turned a
further half turn with the starter cord fully
extended!
Models 140B, 141B
Drive dogs
Dismantle the drive from the crankshaft.
Replace the drive dogs if they are damaged or worn.
Tension the return spring.
● Pull out the cord approx. 30 cm and
stop the starter pulley using your
thumb.
● Lift the starter cord up in the cut-out in
the starter pulley.
● Wind the cord 2 turns anticlockwise
around the hub on the starter pulley.
● Pull out the starter cord fully.
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1
Starter
Assembly, general
Assemble the starter in the reverse order
as set out for dismantling.
503 21 22-01
Replacing the drive
dogs
See chapter 2. “Ignition system, flywheel”
with regard to engines that have the drive
dogs fitted on the flywheel.
Assembly, general
Assemble the starter
Pull out the starter cord a little. Place the
starter in position. Release the starter
cord and check that the drive dogs engage in the starter pulley.
Tighten the screws.
NOTE!
We recommend the use of an over
dimensioned screw if the plastic
threads in the crankcase have
been damaged for some reason.
(no. 503 21 22-01).
Replacing the drive
dogs.
See chapter 2. “Ignition system, flywheel”
with regard to engines that have the drive
dogs fitted on the flywheel.
10
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Ignition system
2.
Contents
Dismantling
Models 322, 325, 18H __________________ 12
Models 140B, 141B ____________________ 13
Dismantling the flywheel ________________ 15
Assembly
Models 322, 325 ______________________ 16
Technical data _______________________ 18
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2
Ignition system
Dismantling
Models 322, 325
Dismantle the cylinder cover, guard over
the muffler and spark plug.
Unhook the throttle cable from the carburettor and remove the screws holding the
clutch cover.
Remove the clutch cover and loosen the
short-circuit cable from the ignition module.
Dismantling
Models 322, 325
The following components must be dismantled for the ignition system to be
accessible.
Cylinder cover, guard over the muffler
and spark plug.
Disconnect the throttle cable from the
carburettor.
Remove the three screws holding the
clutch cover.
Remove the clutch cover complete with
the shaft from the engine.
Loosen both ends of the short-circuit
cable from the ignition module.
504 90 00-02
B
A
B
Dismantle the ignition module and the
centrifugal clutch.
504 90 00-03
Model 18H
Remove the spacer and washer and screw
the clutch down on the crankshaft.
Hold the flywheel and sharply tap the
clutch a few times until the flywheel releases.
Remove the remaining screw (A) holding
the ignition module and both screws (B)
that hold the centrifugal clutch.
Lift off the clutch and ignition module.
Model 18H
Remove the long spacer and washer from
the crankshaft.
Screw down the clutch a few turns on the
shaft.
Hold the flywheel and sharply tap the
clutch a few times until the flywheel releases.
12
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Ignition system
Dismantle the ignition module. Dismantle the ignition module.
B
B
A
Models 140B, 141B
Dismantle the fuel tank.
Remove the short-circuit cable (A) and
both screws (B).
Models 140B, 141B
Empty the fuel tank and pull off the fuel
hoses from the carburettor.
Note how the hoses are connected.
Remove the screws and lift off the fuel
tank.
2
A
Pull apart the short-circuit cable connector and remove the earth cable.
B
Fold open the protective sleeve and separate the throttle cable.
Separate the connectors for the shortcircuit cable (A) and remove the earth
cable (B) by removing the crankcase
screw.
Open the protective sleeve over the cable
joint and lift out the throttle cable running
to the throttle.
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2
Ignition system
Remove the blower pipe.
B
A
A
Dismantle the cylinder cover, heat guard
around the cylinder and the rotary valve
from the carburettor.
Loosen the hose clip and remove the
blower pipe.
Lift off the spark plug cap and unscrew the
spark plug.
Remove the 3 screws (A) holding the
cylinder cover and remove this and the
heat guard from around the cylinder.
Dismantle the rotary valve (B) from the
carburettor by removing the 2 screws
holding the cover. Let the throttle hang
from the throttle cable.
A
A
A
502 50 22-01
Dismantle the harness. Remove the harness from the tubular
frame by removing both screws (A).
Remove the pipe bend.
Remove all screws and separate both
halves of the fan housing.
Remove the pipe bend.
Remove the cleaning cover and all the
screws (12) holding both halves of the fan
housing.
Separate the halves.
14
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Ignition system
Dismantle the impeller
504 91 06-05 502 50 23-01
Dismantle the engine from the fan housing.
Screw in the piston stop no. 504 91 06-5
in the spark plug hole and remove the 3
screws holding the impeller using tool no.
502 50 23-01.
Remove the 4 screws holding the engine
against the fan housing.
Lift off the engine.
2
502 50 23-01
Remove the screws and lift off the ignition
module.
502 50 22-01
Dismantling the
flywheel
Fit the piston stop no. 504 91 06-05 and
remove the nut holding the flywheel and
where appropriate the plate with drive
dogs.
Remove the screws and lift off the ignition
module with the ignition lead, short-circuit cable and grommet.
Dismantling the
flywheel
Assemble the piston stop no. 504 91 0605 in the spark plug hole.
Ensure the piston stop is screwed down
to the bottom.
Remove the nut holding the flywheel and
where appropriate the plate with drive
dogs.
504 91 06-05
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NOTE!
The piston stop cannot be used on
model 122.
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2
Ignition system
Dismantle the flywheel by using the flywheel puller.
502 51 49-01
Dismantle the flywheel by using the bearing puller.
Dismantle the flywheel from the crankcase using the puller no. 502 51 49-01.
Gently knock the puller screw with a hammer, if the flywheel sits tightly on the
crankshaft.
Select a suitable screwdriver and align
the puller so that it does not pull at an
angle.
Pull off the flywheel by using the bearing
puller no. 504 90 90-01.
NOTE!
The puller arms should be placed by
and opposite the magnet on the flywheel to avoid damaging it.
504 90 90-01
Dismantle the flywheel by using a hammer and push bar.
502 51 94-01
Assembly
Models 322, 325
Assemble the centrifugal clutch.
NOTE!
Do not forget the washers between
the flywheel and centrifugal clutch.
Is the flywheel extremely tight?
Lift up the engine body by holding the
puller and then hit the puller screw a few
times with a hammer.
Screw the nut on to the axle to protect the
threads.
Snap off the springs and move the drive
dogs to make space for the hammer.
Hold the flywheel and lift up the engine
body.
Use a hammer to hit the flywheel nut
sharply a few times until the flywheel
becomes loose on the axle.
Tip!
Use the push bar to protect the threads on
the axle and at the same time as it will be
easier to use the hammer.
Do not screw the push bar against the
flywheel – leave approx. 2 mm.
Assembly
Models 322, 325
If the crankshaft has two keyways, the
flywheel should be fitted in the right-hand
keyway seen from the axle end.
Assemble the centrifugal clutch.
NOTE!
Do not forget the washers between
the flywheel and centrifugal clutch.
16
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Ignition system
Assemble the ignition module and adjust
the air gap to 0.3 mm.
502 51 34-02
2
Assemble the ignition module.
Wait to connect the short-circuit cable to
facilitate the adjustment of the air gap. It
should be 0.3 mm between the permanent magnets in the flywheel and the
ignition module.
Now fit the short-circuit cable and the
remaining parts in the reverse order as
set out for dismantling.
NOTE!
Do not forget the rubber bushings
between the clutch cover and the
fuel tank.
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2
Technical data
Model Spark plug Electrode gap Ignition system Air gap
Mondo
122L
Mondo Max
225L/LD
232L
Mondo Mega
225R/RD
232R
322
325
235R
240R
245R
250R
245RX
250RX
252RX
265RX
240RBD
235P
250PS
225E
18H
225H60/75
140B, 141B
132HBV
225BV/225HBV
Ignition system
mm/inch mm/inch
Champion RCJ8Y 0.5/0.02 Phelon 0.3/0.012
NGK BPM 6A CD
NGK BPM 6Y 0.6/0.024 Ikeda Denso 0.3/0.012
Solid State
Champion 0.5/0.02 Phelon 0.3/0.012
RCJ 8Y CD
Champion 0.5/0.02 Walbro 0.3/0.012
RCJ 7Y CD
Champion 0.5/0.02 Walbro 0.3/0.012
RCJ 7Y CD
Champion 0.5/0.02 Phelon 0.3/0.012
RCJ 8Y CD
Champion 0.5/0.02 Walbro 0.3/0.012
RCJ 7Y CD
Champion 0.5/0.02 Walbro 0.3/0.012
RCJ 7Y CD
Champion 0.5/0.02 Walbro 0.3/0.012
RCJ 7Y CD
Champion 0.5/0.02 Walbro 0.3/0.012
RCJ 7Y CD
Champion 0.5/0.02 Walbro 0.3/0.012
RCJ 7Y CD
Champion 0.5/0.02 Electrolux 0.3/0.012
RCJ 7Y ET
Champion 0.5/0.02 Electrolux 0.3/0.012
RCJ 7Y ET
Champion 0.5/0.02 Electrolux 0.3/0.012
RCJ 7Y ET
Champion 0.5/0.02 Electrolux 0.3/0.012
RCJ 7Y ET
Champion 0.5/0.02 Electrolux 0.3/0.012
RCJ 7Y ET
Champion 0.5/0.02 Electrolux 0.3/0.012
RCJ 7Y ET
Champion 0.5/0.02 SEM 0.3/0.012
RCJ 7Y GA6 CD
Champion 0.5/0.02 Walbro 0.3/0.012
RCJ 7Y CD
Champion 0.5/0.02 Walbro 0.3/0.012
RCJ 7Y CD
Champion 0.5/0.02 Electrolux 0.3/0.012
RCJ 7Y ET
Champion 0.5/0.02 Walbro 0.3/0.12
RCJ 7Y CD
Champion 0.5/0.02 Phelon 0.3/0.012
RCJ 8Y Solid State
Champion 0.5/0.02 Walbro 0.3/0.012
RCJ 7Y CD
NGK 0.6–0.7/ Kawasaki 0.4/0.016
BPM 7A 0.024–0.028 Transistor
Champion 0.6/0.024 Phelon 0.25–0.35/
CJ 8Y CD 0.010–0.014
Champion 0.5/0.02 Walbro 0.3/0.012
RCJ 7Y CD
18
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Fuel system
3.
Contents
Air filter __________________________________ 20
Tank venting ______________________________ 20
Primer pump ______________________________ 20
Carburettor _______________________________ 20
Assembly ________________________________ 25
Carburettor settings ________________________ 26
CARB-designed carburettor __________________ 28
Throttle cable _____________________________ 31
Throttle __________________________________ 33
Technical data _____________________________ 36
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3
Fuel system
Air filter
A
Remove the air filter cover and lift out the
air filter for cleaning.
Tank venting
Model 141B
The tank ventilation is integrated in the
fuel cap’s gasket
Blow through the flat hose to check that it
A
is open.
Air filter
Model 141B
Press down the catch on the cover over
the air filter housing and remove the cover
and the air filter for cleaning.
Clean the filter in the same way as described above.
Fit the filter with the smooth side facing in
towards the carburettor.
Ensure the support grille (A) is in position.
Tank venting
Model 141B
The tank ventilation is integrated in the
fuel cap’s gasket and can easily be dismantled for replacement.
Pull off the flat hose from the pin on the
rubber washer and blow through the hose
to check that it is not blocked.
Check that the hole (A) is open.
Primer pump
Models 322, 325, Mondo, 18H
The primer pump facilitates cold starts.
The pump cannot be repaired and must
be replaced if it stops working.
Note how the fuel hoses are connected to
simplify assembly.
3
Carburettor
Models 322, 325
Disconnect the throttle cable from the
carburettor.
Dismantle the carburettor.
Primer pump
Models 322, 325, Mondo, 18H
The primer pump has the task of facilitating the start of the engine when cold. The
pump fills the carburettor with fuel before
attempting to start the engine. This also
prevents vapour bubbles from blocking
the narrow fuel channels.
If the pump does not work it must be
replaced.
Note how the fuel hoses are connected to
simplify assembly.
Carburettor
Models 322, 325
1. Disconnect the throttle cable from the
lever arm on the carburettor.
2. Loosen the carburettor screws.
3. Remove the screws holding the air
filter holder.
20
1
2
2
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Fuel system
Lift off the carburettor and note how the
fuel hoses are connected.
Model 18H
A
B
Disconnect the throttle cable from the
carburettor.
Lift off the carburettor and note how the
fuel hoses are connected.
Model 18H
Disconnect the throttle cable from the
carburettor.
Remove the screw (B) and unhook the
throttle cable from the lever arm on the
carburettor (A).
3
A
Dismantle the carburettor from the cylinder.
Model 141B
Dismantle the cover together with the
rotary valve and cable bracket.
A
Loosen the carburettor screws and lift out
the air filter holder and carburettor.
Remove the fuel hoses from the carburettor.
Model 141B
Loosen both screws (A) and lift off the
cover together with the rotary valve and
cable bracket.
Let the parts remain hanging from the
throttle cable if they are not damaged and
do not need to be replaced.
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3
Fuel system
Dismantle the carburettor from the cylinder.
B
A
B
A
Remove the screws and lift out both distance pieces.
C
Inspect the fibre distance piece with regard to crack formation.
Replace the distance piece if necessary.
Remove the air filter support (A) and both
screws (B) that hold the carburettor on
the cylinder.
Lift off the air filter holder and carburettor
from the cylinder.
Remove the screws (A), the fibre distance piece (B) and the aluminium distance piece (C).
Inspect the fibre distance piece with regard to crack formation. Replace the distance piece if necessary.
B
A
Pull off the fuel hoses and lift out the
carburettor.
Assembling the carburettor –
Zama
Design, function and servicing correspond
with the Walbro carburettor.
Lift out the carburettor and note how both
fuel hoses are connected to the carburettor (rubber hose on the straight nipple).
Assembling the carburettor –
Zama
Zama has the same design and function
as the Walbro carburettor, which means
that servicing is also carried out in the
same way.
The lever arm should lie flush with the
carburettor housing’s contact face.
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Fuel system
Dismantling, assembling
Model 18H
The carburettor is made by Zama.
Dismantle the primer pump’s bellows and
cover over the control diaphragm.
Dismatle te pump diaphragm and the fuel
2
1
screen.
Dismantling, assembling
Model 18H
The carburettor is made by Zama.
It has the same principle design as the
Tillotson and Walbro carburettors.
Dismantle the primer pump’s bellows and
then the cover over the control diaphragm.
Inspect the control diaphragm and needle valve in the same way as previously
described.
Remove the screws holding the cover
over the pump diaphragm.
Lift off the cover, pump diaphragm and
gasket.
Check the diaphragm (1) as described in
the workshop manual.
Carefully remove the fuel screen (2) using, e.g. a needle.
3
Unscrew the jet needles. Unscrew the jet needles.
L
H
Press out the main jet for possible replacement using a suitable punch.
1
The plastic sleeves must first be removed
using a screwdriver on carburettors with
movement limiters.
NOTE!
Note how the needles are
positioned.
(For example, the H-needle is a
little shorter than the L-needle).
The main jet can be pressed out for
possible replacement using a suitable
punch.
NOTE!
When the new jet is fitted it must
not be pressed in further than so
that the edge (1) on the jet lies
flush with the carburettor
housing.
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3
Fuel system
Assemble the carburettor and pressure
test it.
Wait to fit the movement limiters on the jet
needles.
Dismantling, assembling
Model 141B
Remove the screws and lift off cover with
the pump bellows.
Assemble the carburettor in the reverse
order as set out for dismantling.
The needle valve lever arm should be
adjusted to a level flush with the carburettor housing’s contact face.
NOTE!
The control diaphragm and pump
diaphragm should lie closest to
the carburettor housing!
Wait to fit the movement limiters on the jet
needles.
Dismantling, assembling
Model 141B
This carburettor has a rotary valve instead of a throttle valve.
Remove the 4 screws and lift off cover
with the pump bellows.
Lift off the cover above the control diaphragm and carefully remove the non–
return valve. Check that it opens and
closes.
Continue to dismantle and assemble the
carburettor in the same way as described
for model 122.
Lift off the cover over the control diaphragm.
Carefully remove the non-return valve
and check that it opens and closes by
pressing together the valve’s short sides
with you thumb nail.
Hold the valve against a light to make it
easier to see whether it closes fully.
Continue to dismantle and assemble the
carburettor in the same way as described
for model 122.
24
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Fuel system
3
Assembly
Models 322, 325
1. First assemble the fuel hoses on the
4
5
1
2
6
3
carburettor.
NOTE!
The hose, with the fuel filter in the
tank, should be fitted on the
carburettor’s inlet side (pump
chamber).
2. Keep the air filter holder (1) in position
on the carburettor.
3. Slide in the carburettor screws (2).
4. Position the gasket (3) and screw together the entire carburettor assembly
against the distance piece (4). Tighten
the carburettor screws crosswise.
NOTE!
Do not forget the screw (5) that
holds the air filter holder against
the distance piece.
5. Connect the throttle cable to the lever
arm on the carburettor.
Make sure the cable enters the correct slot in the clutch cover and in the
guide on the air filter holder (6).
Assemble the remaining parts in the reverse order as set out for dismantling.
Model 18H
Connect the fuel hoses.
A
A
B
Connect the throttle cable.
Tighten the air filter holder.
Clean or replace the air filter.
Model 18H
Connect the fuel hoses on the carburettor.
The thin hose (A) is connected to the
nipple on the carburettor body (pump
diaphragm).
Connect the throttle cable (A) to the throttle valve’s lever arm.
Secure the cable guide (B) on the distance piece.
Tighten the air filter holder.
Do not forget the gasket between the
carburettor and the distance piece!
Clean or replace the air filter before assembly.
Clean in tepid soapy water.
Fit the air filter cover.
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3
A
Fuel system
Model 141B
Fit the distance piece on the cylinder.
Turn the carburettor so that the recessed
sealing ring (A) comes against the air
filter holder.
Tighten the carburettor and air filter holder
against the cylinder.
Slide down the rotary valve in the carburettor and screw on the cover.
Check that the throttle works.
Model 141B
Pay special attention that the distance
pieces and gaskets face the right way
and do not block the impulse channel
when fitted on the cylinder.
Secure the distance piece closest to the
carburettor with a little grease. This facilitates carburettor assembly.
Turn the carburettor so that the recessed
sealing ring (A) comes against the air
filter holder.
Place the carburettor screws in the air
filter holder (do not forget the choke valve)
and then slide the carburettor on the
screws.
Tighten the carburettor against the cylinder.
Slide down the rotary valve in the carburettor housing. Tighten the cover and
check that the throttle is turned easily
when accelerating and that it rests against
the idling screw when the throttle is released.
H
L
Carburettor settings
WARNING!
!
Function
The carburettor has the task of supplying a combustible fuel/air mixture to the cylinder.
The amount
The mixture’s composition
needles “H” and “L”.
The needles must be correctly adjusted in order for the engine to give maximum power
at different speeds, run steadily while idling and to react quickly when accelerating.
The setting of the carburettor can vary a little depending on the humidity, temperature
and air pressure.
L = Low speed needle
H = High speed needle
T = Adjuster screw for idling
The fuel quantity in relation to the air flow permitted by the throttle opening is
adjusted by the L and H-needles. Turning the needles clockwise gives a leaner fuel
mixture (less fuel) and turning them anticlockwise gives a richer fuel mixture (more
fuel).
● The T-screw regulates the position of the throttle while the engine is idling. Turning
the screw clockwise gives a higher idling speed while turning it anticlockwise gives
a lower idling speed.
The clutch and clutch cover must be fitted under all
circumstances when testing the engine in connection with
carburettor adjustment.
Otherwise there is a risk of the clutch becoming loose resulting in
serious personal injury.
of this mixture is controlled by the throttle.
of fuel and air is controlled by means of the adjustable
A leaner
mixture gives
higher
revs while
a richer
mixture gives
less
revs.
26
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Fuel system
Basic setting
The carburettor is set to its basic setting when test run at the factory. The basic setting is
“richer” than the optimal setting (the max speed is 600–800 rpm under the recommended
max. speed) and should be kept during the engine’s first working hours. Thereafter the
carburettor should be finely adjusted. The basic setting can vary between:
H = 1 to 1 1/4 turns (model 235 P: 3/4 – 1 turn, Mondo + Mega + Max, 18 H: 2 turns,
L
H
Fine adjustment
Fine adjustment of the carburettor should be carried out after the
engine has been “run-in”.
● The air filter should be clean and the cylinder cover fitted
when adjustments are made.
First adjust the L-needle, then the H-needle and finally the
idling speed's T-screw.
The following speed recommendations apply:
Idling speed = 2,500 rpm.
322, 325: 2 1/2 turns)
L = 1 to 1 1/4 turns (model 235 P: 3/4 – 1 turn, Mondo + Mega + Max, 18H: 2 turns)
Basic setting model 235 P
The pruner’s engine can not be revved to the max speed as the cutting head’s blades
go against the stop and the engine slows. Consequently, the engine revs at max under
load. The high speed needle H should not be changed from the basic settings (3/4 – 1
turn open). If the muffler smokes heavily, at the same time as the engine 4 strokes
a,great deal the setting is too rich. Turn the H-needle clockwise until you find the setting
that sounds right.
Max. speed
Model During running in After running in
265 10,900 11,500
252, 250 RX (R) 12,900 (11,900) 13,500 (12,500)
240 11,900 12,500
245 11,900 12,500
225 10,500 11,000
232 10,300 10,800
235 10,500 11,000
240 RBD 10,500 11,000
322, 325 12,500 12,500
122 10,800
32 7,000
Mondo 9,000
Mega / Max 9,000
250PS
235 P — —
225 H60 / H75 10,500 11,000
18H 9,500 10,000
132HBV 7,100 7,600
140B, 141B
225HBV 7,700 8,200
NOTE!
The max. recommended speed must not be exceeded.
When checking the speed on a trimmer no part of the
cord should be extended.
Check the speed using the tachometer 502 71 14-01.
● Carefully screw in (clockwise) the
L and H-needles until they bottom. Now screw out (anticlockwise) the needles 1 turns. The
501 60 02-02
carburettor now has the setting H
= 1 and L = 1. Use the special
screwdriver 501 60 02-02.
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3
● Start the engine and run warm for 10 minutes.
NOTE!
If the cutting equipment rotates while idling the T-screw
should be turned anticlockwise until it stops.
Low speed needle L
Find the highest idling speed by slowly turning the low speed
needle clockwise and anticlockwise. When the highest speed has
been found, turn the L-needle 1/4 turn anticlockwise.
High speed needle H
The high speed needle H affects the engine’s power and speed.
A too lean H-needle setting (H-needle screwed in too far) gives
too little fuel to the engine resulting in damage to the engine.
Run the engine at full throttle for about 10 seconds. The H-needle
is set correctly when the engine “splatters” a little.
If the muffler smokes heavily, at the same time as the engine
splatters a great deal the setting is too rich. Turn the H-needle
clockwise until you find the setting that sounds right.
NOTE!
A tachometer should always be used to find the
optimal setting.
The recommended max. speed must not be exceeded.
Idling speed T-screw
Let the engine idle for about 30 seconds or until the speed has
stabilised. Adjust the idling speed T-screw until the engine idles
without stopping.
● Turn the screw clockwise if the engine stops.
● Turn the speed anticlockwise to lower the speed.
Correctly adjusted carburettor
A correctly adjusted carburettor means that the engine accelerates without hesitation and it 4 strokes a little at full throttle.
● A too lean adjusted L-needle can cause starting difficulties
and bad acceleration.
● A too lean adjusted H-needle results in lower power, bad
acceleration and/or damage to the engine.
● A too rich setting of the “L” and “H” needles give acceleration
problems or a too low working speed.
27
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3
Fuel system
Carburettors in E-TECH and CARB-EPA designs
(CARB-EPA only applies to USA)
On these types of carburettor the H and L-needles can be adjusted within extremely
tight limits, to among others, comply with the stringent demands with regard to the
hydrocarbon and nitrogen oxide content in the exhaust fumes.
The carburettor needles on these carburettors are fitted with plastic sleeves with
movement limiters
To carry out adjustment when replacing needles or the entire carburettor the engine
must be under load. This is achieved by fitting a Trimmy Fix with the specified length and
diameter of trimmer cord. Consequently, the stated speed will be much lower than with
“normal” carburettor adjustment when the motor may run freely.
After replacing the needles or the entire carburettor on a CARB-EPA approved engine,
adjustment must be carried out according to the instructions below.
The combiguard or trim guard must be fitted when adjusting the H-needle.
After replacing the complete
carburettor
1. Check that the plastic sleeve on the H-needle is turned as far
as possible anticlockwise (richest fuel mixture). The sleeve
sits freely on the needle and can be turned without affecting
the needle’s setting.
Do not change the L-needle setting. This is adjusted at the
factory and the plastic sleeve is already fixed on the needle.
2. Fit four trimmer cords Ø 3.3 mm on a Trimmy Fix.
(Trimmy Fix M10, 531 00 38-69 for models 225, 232, 322L,
322R, 325L, 325L-X, 325R-X. Trimmy Fix M12, 502 13 87-02
for model 235).
Maybe the hole needs to be enlarged a little to make fitting the
trimmer cords easier.
(Does not apply to models 225H60/H75 and 18H).
3. Cut the trimmer cord to the right length (measure the length
to the edge of the Trimmy Fix).
Model 225: 145 mm
Model 232: 155 mm
Model 235: 170 mm
Models 322L/R, 325L/L-X/R-X: 142 mm
Fit the Trimmy Fix on the machine.
Model 322C must be run with Trimmy Hit VI and its standard
cord (Ø 2.0 mm). Cut off the cord ends so that they are
146 mm long.
(Does not apply to models 225H60/H75 and 18H).
NOTE!
The spray guard must be removed from model 235.
Exercise care when the trimmer cord is rotating.
4. Start the engine. Adjust the idling speed T-screw if necessary.
5. Use screwdriver 531 00 48-63 to adjust the H-needle. The
blade is 2 mm wide and goes through the plastic sleeve and
only adjusts the needle.
Adjust the H-needle so that the max. speed 8400 ± 200 rpm
is set.
Use the tachometer 502 71 14-01 to check the speed.
(Does not apply to models 225H60/H75 and 18H).
531 00 48-63
28
502 71 14-01
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6. Run the engine warm for 2–3 minutes.
7. Check that the max speed is still 8400 ± 200 rpm. Adjust the
H-needle if necessary.
8. Check that the plastic sleeve on the H-needle is turned as far
as possible anticlockwise (richest fuel mixture).
9. Press in the plastic sleeve using a punch (Ø 5 mm).
The basic setting of the carburettor is now complete. Further fine
adjustment, within the limits that the plastic sleeves on the needles
permit, can be necessary.
Departures for models 225H60/H75, 18H
5A. Adjust the H-needle until the max speed is reached.
Then turn the needle anticlockwise until the speed drops by
500 rpm.
6A. Run the engine warm at full throttle for 2–3 min.
7A. Check the idling speed and that the engine reacts quickly
when accelerating.
7B. Adjust the H-needle until the max speed is reached. Then turn
the needle anticlockwise until the speed drops by 500 rpm.
After replacing only the H-needle
1. Turn the L-needle as far as possible anticlockwise (richest fuel
mixture).
2. Remove the plastic sleeve on the H-needle and unscrew the
needle.
3. Carefully screw the new H-needle to the bottom and then
loosen it a 1/2 turn. On models 322/325 the needle should be
loosened approx.2 1/2 turns.
4. Press a new plastic sleeve on the H-needle down to the first
stop. The sleeve can now be turned without turning the needle.
5. Turn the plastic sleeve as far as possible anticlockwise (richest fuel mixture) without turning the needle.
6. Fit four trimmer cords Ø 3.3 mm on a Trimmy Fix.
(Trimmy Fix M10, 531 00 38-69 for models 225, 232, 322L,
322R, 325L, 325L-X, 325R-X. Trimmy Fix M12, 502 13 87-02
for model 235).
Maybe the hole needs to be enlarged a little to make fitting the
trimmer cords easier.
(Does not apply to models 225H60/H75).
7. Cut the trimmer cord to the right length (measure the length
to the edge of the Trimmy Fix).
Mod. 225: 145 mm Mod. 232: 155 mm
Mod. 235: 170 mm Mod. 322L/R, 325L/L-X/R-X: 142 mm
Fit the Trimmy Fix on the machine.
Model 322C must be run with Trimmy Hit VI and its standard cord
(Ø 2.0 mm). Cut off the cord ends so that they are 146 mm long.
(Does not apply to models 225H60/H75 and 18H).
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Fuel system
The spray guard must be removed from model 235. Exercise
care when the trimmer cord is rotating.
8. Start the engine. Adjust the idling speed T-screw if necessary.
9. Use screwdriver 531 00 48-63 to adjust the H-needle. The
blade is 2 mm wide and goes through the plastic sleeve and
only adjusts the needle.
Adjust the H-needle so that the max. speed 8400 ± 200 rpm
is set.
Use the tachometer 502 71 14-01 to check the speed.
(Does not apply to models 225H60/H75 and 18H).
10. Run the engine warm for 2–3 minutes.
531 00 48-63
11. Check that the max speed is still 8400 ± 200 rpm. Adjust the
H-needle if necessary.
12. Check that the plastic sleeve on the H-needle is turned as far
as possible anticlockwise (richest fuel mixture).
13. Press in the plastic sleeve using a punch (Ø 5 mm).
The basic setting of the carburettor is now complete. Further fine
adjustment, within the limits that the plastic sleeves on the
needles permit, can be necessary.
502 71 14-01
3
531 00 48-63
Now turn the L-needle as far as possible anticlockwise (richest fuel mixture).
9. Turn the plastic sleeve on the H-needle as far as possible
anticlockwise (richest fuel mixture).
10. Fit four trimmer cords Ø 3.3 mm on a Trimmy Fix.
(Trimmy Fix M10, 531 00 38-69 for models 225, 232, 322L,
322R, 325L, 325L-X, 325R-X. Trimmy Fix M12, 502 13 87-02
for model 235).
Maybe the hole needs to be enlarged a little to make fitting the
trimmer cords easier.
(Does not apply to models 225H60/H75 and 18H).
11. Cut the trimmer cord to the right length (measure the length to
the edge of the Trimmy Fix).
Model 225: 145 mm Model 232: 155 mm
Model 235: 170 mm
Models 322L/R, 325L/L-X/R-X: 142 mm
Fit the Trimmy Fix on the machine.
Model 322C must be run with Trimmy Hit VI and its standard cord
(Ø 2.0 mm). Cut off the cord ends so that they are 146 mm long.
(Does not apply to models 225H60/H75 and 18H).
502 71 14-01
Departures for models 225H60/H75, 18H
9A. Adjust the H-needle until the max speed is reached.
Then turn the needle anticlockwise until the speed drops by
500 rpm.
10A.Run the engine warm at full throttle for 2–3 min.
11A.Check the idling speed and that the engine reacts quickly
when accelerating.
11B. Adjust the H-needle until the max speed is reached. Then turn
the needle anticlockwise until the speed drops by 500 rpm.
After replacing the H- and L-needles
1. Remove the plastic sleeves from both needles and screw out
the needles.
2. Carefully screw the new needles in until they bottom.
Screw out the L-needle 2 turns. On models 322/325 the
needle should be screwed out approx. 1 turn.
Screw out the H-needle 1/2 turn. On models 322/325 the
needle should be screwed out approx. 2 1/2 turns.
3. Press the new plastic sleeves on the needles until the first stop.
The sleeves can still be turned without the needles turning.
4. Turn the plastic sleeve on the L-needle as far as possible
clockwise (leanest fuel mixture).
5. Start the engine and let it idle.
6. Use screwdriver 531 00 48-63 to adjust the L-needle. The
blade is 2 mm wide and goes through the plastic sleeve and
only adjusts the needle.
Adjust the L-needle so that the highest idling speed is obtained.
Use the tachometer 502 71 14-01 to check the speed.
7. Check that the plastic sleeve on the L-needle is still turned as
far as possible clockwise (leanest fuel mixture).
8. Press the plastic sleeve on the L-needle using a punch (Ø 5 mm).
NOTE!
The spray guard must be removed from model 235.
Exercise care when the trimmer cord is rotating.
12. Start the engine. Adjust the idling speed T-screw if necessary.
13. Use screwdriver 531 00 48-63 to adjust the H-needle. The
blade is 2 mm wide and goes through the plastic sleeve and
only adjusts the needle.
Adjust the H-needle so that the max. speed 8400 ± 200 rpm
is set.
Use the tachometer 502 71 14-01 to check the speed. (Does
not apply to models 225H60/H75).
14. Run the engine warm for 2–3 minutes.
15. Check that the max speed is still 8400 ± 200 rpm. Adjust the
H-needle if necessary.
16. Check that the plastic sleeve on the H-needle is turned as far
as possible anticlockwise (richest fuel mixture).
17. Press in the plastic sleeve using a punch (Ø 5 mm).
The basic setting of the carburettor is now complete. Further fine
adjustment, within the limits that the plastic sleeves on the
needles permit, can be necessary.
Departures for models 225H60/H75, 18H
13A. Adjust the H-needle until the max speed is reached.
Then turn the needle anticlockwise until the speed drops by
500 rpm.
14A. Run the engine warm at full throttle for 2–3 min.
15A. Check the idling speed and that the engine reacts quickly
when accelerating.
15B. Adjust the H-needle until the max speed is reached. Then turn
the needle anticlockwise until the speed drops by 500 rpm.
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