250PS
Operator's manual
Read these instructions carefully and make sure
you understand them before using the saw.
114 00 07-26
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CONTENTS
SYMBOL EXPLANATION
WARNING!
Symbols ................................................................................. 2
Under no circumstances may the design
of the machine be modified without the
permission of the manufacturer. Always
use genuine accessories. Non-authorised
modifications and/or accessories can
result in serious personal injury or the
death of the operator or others.
!
CONTENTS
Contents................................................................................3
SAFETY INSTRUCTIONS
Personal protective equipment ...............................................4
The machine's safety equipment............................................4
Control, maintenance and service of the machine's safety
equipment .............................................................................6
Cutting equipment designed to minimise kickback............... 7
Specification of blade and chain ............................................8
Sharpening your chain and adjusting raker clearance ............8
Tensioning the saw chain .....................................................10
Chain lubrication ................................................................10
Checking wear on cutting equipment ..................................11
General safety instructions...................................................12
General working instructions ..............................................13
Basic safety precautions .......................................................13
Basic clearing techniques .....................................................14
WARNING!
The machine’s cutting equipment must
under no circumstances be connected to
other hydraulic units than what it is
designed for.
!
!
WARNING!
Only original cutting equipment must be
connected to the hydraulic unit.
WHAT IS WHAT?
What is what on the machine?.............................................15
ASSEMBLY
Connecting the hydraulic hoses ...........................................16
Adapter................................................................................16
Dismantling the hydraulic hoses..........................................16
Assembly of throttle handle .................................................16
FUEL HANDLING
Petrol ...................................................................................17
Twostroke oil .......................................................................17
Mixing .................................................................................17
Fuelling ...............................................................................17
Hydraulic oil .......................................................................18
START AND STOP
Cold engine .........................................................................18
Warm engine .......................................................................18
Stop .....................................................................................18
Start .....................................................................................19
Fitting the harness ...............................................................19
Removing the harness ..........................................................19
Quick release in case of hazard ............................................19
MAINTENANCE
Carburettor..........................................................................20
Air filter ...............................................................................21
Muffler ................................................................................21
Spark plug ...........................................................................21
Cooling system ....................................................................22
Replacement of chain drive wheel .......................................22
Cleaning of the shaft ...........................................................22
Adjustment of the ball joint.................................................22
Maintenance schedule .........................................................22
TECHNICAL DATA
250 PS .................................................................................24
English – 3
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SAFETY INSTRUCTIONS
Personal protective equipment
The machine's safety equipment
This section describes the machine's safety equipment, its
function and how checks and maintenance are carried out to
ensure that it operates correctly. (See the chapter "What is
what" to locate where this equipment is positioned.)
IMPORTANT INFORMATION
•
A pruning saw used incorrectly or carelessly can
become a dangerous tool that can cause serious
or fatal injury to the operator or others. It is
extremely important that you read and underst-
and the content of this manual.
WARNING!
•
When using a pruning saw, personal protective
equipment approved by the appropriate
Never use a machine with defective
!
safety equipment. Follow the control,
maintenance and service instructions
described in this section.
authorities must be used. Personal protective
equipment does not eliminate the risk of
accidents, however, it can reduce the effect of
injury in the event of an accident. Ask your dealer
for help when choosing protective equipment.
GLOVES
1. Throttle trigger
Gloves should be worn
when necessary, e.g. when
assembling cutting
equipment.
lock
The throttle trigger lock is
designed to prevent the
throttle from accidentally
being engaged. When the
trigger lock (A) is pressed
into the handle (= when
you hold the handle) the
throttle (B) is released.
When the grip on the
HELMET
A helmet should be worn
to eliminate headinjuries
caused by downfalling
branches.
A
B
handle is released the
throttle and the throttle
trigger lock return to their
original positions. This
takes space via two indepen-
dent return spring systems.
This means that the throttle
is automatically locked in
its "idling" position.
EAR PROTECTION
Ear protection offering
sufficient dampening
effect should be used.
EYE PROTECTION
Blows from branches or
other can damage the
eyes.
2. Stop switch
The stop switch should be
used to stop the engine.
SHOES OR BOOTS
Use anti-slip and sturdy
footwear.
CLOTHING
Wear clothes made of a
strong fabric and avoid
loose clothing that can
catch on shrubs and
branches.
3. Emergency
release
The harness is fitted with
an emergency release. By
pulling the red strap the hip
and one shoulder belt
release at the same time,
and the harness and engine
unit slide down to the
ground.
FIRST AID KIT
A first aid kit should
always be easy to reach.
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SAFETY INSTRUCTIONS
4. Vibration damp-
ing system
Your machine is equipped
with a vibration damping
system, which is designed to
give as vibration-free and
comfortable use as possible.
5. Silencer
The silencer is designed to
give the lowest possible noise
level and to direct the
engine's exhaust fumes away
from the operator.
In countries that have a warm
and dry climate the risk of
fire is obvious. We have
therefore fitted certain
silencers with a spark arrest
screen. Check if your silencer
is fitted with this kind of
screen.
The machine’s vibration
system reduces the transfer
of vibrations between the
engine unit and the harness.
The harness is also well
padded at the hip section
and has wide shoulder belts
to distribute the weight and
vibrations.
It is extremely important that the instructions for checking,
The vibrations you are
exposed to originate from
the ”irregular” contact
which occurs between the
chain and the wood during
the sawing.
maintaining and servicing the silencer are followed. (See the
section "Control, maintenance and service of the machine's
safety equipment")
WARNING!
The exhaust fumes from the engine are hot
!
Sawing in ”hard” wood
(most deciduous trees) gives
more vibrations than sawing
in ”soft” wood (most
conifers).
and may contain sparks which can start a
fire. Never start the machine indoors or near
combustible material!
WARNING!
Sawing with unsharp or
incorrect (wrong type or
incorrectly filed) cutting
equipment increases the
level of vibrations.
During use and for some time after the
silencer is very hot. Do not touch the
silencer if it is hot!
!
6. Cutting equip-
ment
Observe care when using,
and make sure that the
blade’s pitch sector never
comes into contact with
objects.
WARNING!
Over exposure to vibrations can result in
!
blood-vessel or nerve injury to persons
suffering with blood circulation problems.
Seek medical attention if you experience
physical symptoms that can be related to
over exposure to vibrations. Examples of
such symptoms are "numbness", lack of
feeling, "tickling", "pricking", "pain", lack
of or a reduction in normal strength,
changes in the colour of the skin or its
surfaces. These symptoms normally
appear in the fingers, hands or wrists.
NOTE!
The guard should always be
fitted over the cutting
equipment during trans-
port and storage.
English – 5
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SAFETY INSTRUCTIONS
3. Vibration damp-
ing system
• Check the vibration
damping elements
Control, maintenance and service of
the machine's safety equipment
IMPORTANT INFORMATION
regularly for material
cracks and distortion.
•
All service and repairs to the machine require
special training.
•
This applies especially to the machine's safety
equipment. If the machine does not meet any of
the controls listed below you should contact
your service workshop.
• Check that the vibration
damping elements are
securely attached between
the engine unit and the
harness.
•
The purchase of one of our products guarantees
that professional repair and servicing will be
carried out on it. If the point of purchase is not
one of our servicing dealers, please ask for
details of the closest service workshop.
1. Throttle trigger
lock
4. Silencer
• Check that the throttle is
locked in the "idling
position" when the
• Never use a machine that
has a defective silencer.
throttle trigger lock is in
its original position.
• Check regularly that the
silencer is secure.
• Press in the throttle
trigger lock and make
sure it returns to its
original position when
released.
• If the silencer is fitted
with a spark arrest screen
then it should be cleaned
regularly. A blocked
screen leads to the engine
overheating with serious
damage as a result. Never
use a silencer with a
defective spark arrest
screen.
• Ensure that the throttle
and throttle trigger lock
move easily and that their
return spring systems
function.
• See section "Start". Start
the machine and apply
full throttle. Release the
throttle and check that
the cutting equipment
stops and remains at a
standstill. If the cutting
equipment rotates with
the throttle in the idling
position then the
carburettor's idling setting
must be checked. See
chapter "Main-tenance".
2. Stop switch
• Start the engine and make
sure that the engine stops
when the stop switch is
moved to the stop
position.
6– English
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SAFETY INSTRUCTIONS
5. Cutting equipment
This section describes how through correct maintenance and
through using the right type of cutting equipment you can:
Cutting equipment designed to
minimise kickback
• Obtain maximum cutting capacity.
WARNING!
• Increase the service life of the cutting equipment.
Faulty cutting equipment or the wrong
!
combination of bar and chain increases the
risk of kickback. Use only the bar and chain
combinations recommended in the
”Technical data” section.
A. Only use cutting
equipment
recommended by us!
See the ”Technical data”
section.
The only way to avoid kickback is to make sure that the
kickback zone of the bar never touches anything.
By using cutting equipment with “built-in” kickback
protection and keeping the chain sharp and well-maintained
you can reduce the effects of kickback.
B. Keep the chain cutting
teeth properly
sharpened! Follow our
instructions and use the
recommended file
gauge. A damaged or
badly sharpened chain
increases the risk of
accidents.
Guide bar
The smaller the tip radius the
smaller the kickback zone
and the lower the chance of
kickback.
C. Maintain the correct
raker clearance! Follow
our instructions and use
the recommended raker
gauge. Too large a
Saw chain
A saw chain is made up of a number of links, which are
available in standard and low-kickback versions.
clearance increases the
risk of kickback.
None
Standard
Low-kickback
D. Keep the chain properly
tesioned! If the chain is
slack it is more likely to
jump off and lead to
increased wear on the
bar, chain and drive
sprocket.
Cutting link
Drive link
Side link
E. Keep cutting equip-
ment well lubricated
and properly main-
tained! A poorly
lubricated chain is more
likely to break and lead
to increased wear on the
bar, chain and drive
sprocket.
Combining these links in different ways gives different degrees
of kickback reduction. In terms of kickback reduction alone,
four different types of link are available.
Kickback reduction Cutting link Drive link
Low
Side link
Standard
WARNING!
High
!
Never use a machine with defective
safety equipment. The safety equipment
should be maintained as described in
this section. If your machine does not
meet any of these controls you should
contact your service workshop.
Extra high
English – 7
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SAFETY INSTRUCTIONS
Specification of blade and chain
When the cutting equipment supplied with your saw
becomes worn or damaged you will need to replace it. Use
only the type of bar and chain recommended by us.
Sharpening your chain and
adjusting raker clearance
WARNING!
The risk of kickback is increased with a
badly sharpened chain!
!
Guide bar
• Length (inches/cm)
A. General information on sharpening
cutting teeth
• Number of teeth on bar
tip sprocket (T).
• Never use a blunt chain. When the chain is blunt you have
to exert more pressure to force the bar through the wood
and the cuttings will be very small. If the chain is very blunt
it will not produce any cuttings at all, just wood powder.
Small number = small tip
radius = low-kickback
• Chain pitch (inches)
• A sharp chain eats its way through the wood and produces
long, thick cuttings.
The spacing between the
drive links of the chain
must match the spacing of
the teeth on the bar tip
sprocket and drive
• The cutting part of the
chain is called the
CUTTING LINK and
this consists of a
A
B
sprocket.
• Number of drive links
CUTTING TOOTH
(A) and the RAKER LIP
(B). The cutting depth is
determined by the
difference in height
between the two.
The number of drive links
is determined by the
length of the bar, the
chain pitch and the
number of teeth on the
bar tip sprocket.
• When you sharpen a
cutting tooth there are
five important
• Bar groove width (inches/
mm)
factors to remember:
The groove in the bar
must match the width of
the chain drive links.
FILING ANGLE
CUTTING ANGLE
FILE POSITION
• Saw chain oil hole and
hole for chain tensioner
The bar must be matched
to the chain saw design.
Saw chain
• Saw chain pitch (inches)
Spacing between drive
links.
• Drive link width (mm/
inches)
• Number of drive links
• Level of kickbak
reduction
ROUND FILE DIA-
METER
The level of kickback
reduction offered by a
chain is indicated by its
model number.
FILE DEPTH
1
5
8– English
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SAFETY INSTRUCTIONS
It is very difficult to sharpen a
chain correctly without the
right equipment. We recom-
mend you to use a file gauge.
This will help you obtain the
maximum kickback reduction
and cutting performance from
your chain.
C. General advice on setting raker
clearance
• When you sharpen the
cutting teeth you reduce
the RAKER
CLEARANCE (cutting
depth). To maintain
cutting performance
you must file back the
raker teeth to the
The following faults will increase the
risk of kickback considerably.
!
recommended height.
• FILE ANGLE TOO
LARGE
• On a low-kickback
cutting link the front
edge of the raker lip is
rounded. It is very
important that you
maintain this radius or
bevel when you adjust
the raker clearance.
• CUTTING ANGLE TOO
SMALL
• FILE DIAMETER TOO
SMALL
• We recommend the use
of a raker gauge to
achieve the correct
clearance and bevel on
the raker lip.
B. Sharpening
cutting tooth
To sharpen cutting teeth you
will need a ROUND FILE
and a FILE GAUGE.
1. Check that the chain is
correctly tensioned. A
slack chain is difficult to
sharpen correctly.
WARNING!
The risk of kickback is increased if the
raker clearance is too large!
!
2. Always file cutting teeth
from the inside face,
reducing the pressure on
the return stroke.
File all the teeth on one
side first, then turn the
saw over and file the
teeth on the other side.
min 4 mm
(0,16")
3. File all the teeth to the
same length. When the
length of the cutting
teeth is reduced to 4 mm
(.16") the chain is worn
out and should be
replaced.
English – 9
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SAFETY INSTRUCTIONS
D. Correction of raker clearance
• When correction of the
raker clearance is made
the teeth must be newly
sharpened.
1. Release the two nuts.
We recommend that you
adjust the raker clearance
every third time you
sharpen the chain.
NOTE! This
recommendation
2. Adjust the chain tension by
turning the chain
tensioning screw.
assumes that the length
of the cutting teeth is not
reduced excessively.
• A FLAT FILE and an
RAKER CLEARANCE
GAUGE are required to
correct the raker
3. Tighten both nuts.
clearance.
• Place the gauge over the
raker lip.
• Place the file over the
part of the lip that
protrudes through the
gauge and file off the
excess. The clearance is
correct when you no
longer feel any resistance
as you draw the file over
the gauge.
Chain lubrication
A. Checking
• Check the chain
lubrication each time the
petrol is replenished.
Tensioning the saw chain
WARNING!
Aim the tip of the saw at a
light coloured surface
about 20 cm away. After 1
minute running at 3/4
throttle you should see a
distinct line of oil on the
light surface.
A slack chain may jump off and cause
serious or even fatal injury.
!
• The more you use a
chain the longer it
becomes. It is therefore
important to adjust the
chain regularly to take
up the slack.
The oil flow can be
regulated with the screw
(A) on the hydraulic
motor.
A
• Check the chain tension
every time you refuel.
Turn the screw anti-
clockwise to increase the
flow.
NOTE! A new saw chain
has a running-in period
during which you should
check the tension more
frequently.
• Tension the chain as
tightly as possible, but
not so tight that you
cannot pull it round
freely by hand.
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SAFETY INSTRUCTIONS
B. Procedure if the lubrication does not
B. Chain drive wheel
function:
Check regularly the degree
of wear on the drive wheel.
Change if it is irregularly
worn.
1. Check that the oil
channel in the bar is not
obstructed. Clean if
necessary.
The chain drive wheel
should be changed each
time the chain is changed.
2. Check that the groove in
the edge of the bar is
clean. Clean if necessary.
3. Check that the bar tip
sprocket turns freely.
If the chain lubrication
system is still not
C. Guide bar
working after carrying
out the above measures
you should contact your
service agent.
Check regularly:
• Whether there are burrs
on the edges of the bar.
Remove these with a file
if necessary.
• Whether the groove in
the bar has become badly
worn. Replace the bar if
necessary.
Checking wear on cutting equipment
A. Saw chain
Check the saw chain daily
for:
• Whether the tip of the
bar is uneven or badly
worn. If a hollow forms
on one side of the bar tip
this is due to a slack
chain.
• Visible cracks in rivets
and links.
• Whether the chain is
stiff.
• Whether rivets and links
are badly worn.
Use a new chain to
compare the wear on the
old one.
min 4 mm
(0,16")
• To prolong the life of the
bar you should turn it
over daily.
When the length of the
cutting teeth has worn
down to only 4 mm the
chain must be replaced.
WARNING!
Defective cutting equipment can increase
the risk for accidents.
!
English – 11
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SAFETY INSTRUCTIONS
Fuel safety
General safety instructions
• Never fill the machine
while the engine is running.
Always stop the engine and
let it cool for a few minutes
before refuelling.
IMPORTANT INFORMATION
•
•
The machine is only designed for tree pruning.
The only accessories to be used with the
engine unit as a drive source are the cutting
units we recommend.
•
•
•
Provide good ventilation
when filling or mixing
fuel.
•
Never use the machine if you are tired, if you
have consumed alcohol, or if you are taking
medicines that can affect your sight, your
judgement or the control of your body.
Move the machine at least
3 m from the filling
position before starting.
•
•
Use personal protective equipment. See the
section "Personal protective equipment".
Never use a machine that has been modified so
that it no longer corresponds with the original
design.
Never start the machine:
•
Never use a machine that is faulty. Follow the
maintenance, control and service instructions
in this Operator's Manual.
a) If you have spilt fuel on
it:
Wipe up all spillage.
Some maintenance and service actions should
be carried out by trained and qualified
specialists. See the chaper "Maintenance".
b) If you have spilt fuel on
yourself or your clothes:
Change your clothes.
c) If there is a fuel leak:
Change damaged parts.
Start
Make regular checks for
leakage from the fuel cap
and the fuel supply pipes.
• Never start the engine unless the hydraulic oil has been
replenished and the hydraulic hoses are connected. Running
without hydraulic oil or without connected hoses can result
in damage to the hydraulic system.
• Never start the engine indoors. Pay attention to the danger
of inhaling toxic exhaust fumes.
• Make sure that there is no risk of people or animals coming
in contact with the cutting equipment.
• Place the machine on the
ground and make sure that
the cutting equipment is
not in contact with
branches or stones.
Press the engine to the
ground with the left hand
(NOTE! Not with the
foot). Grip the start handle
with the right hand and
slowly pull out until a
resistance is felt (the start
hooks engage). Now give a
quick and strong pull.
WARNING!
Starting with the start throttle function
!
connected can give an uncontrolled
activation of the cutting equipment.
WARNING!
!
Never touch the cutting equipment when
the engine is running.
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SAFETY INSTRUCTIONS
Transport and storage
Basic safety precautions
1. Observe your surroundings:
• Store and transport the machine and fuel so that any leakage
or fumes do not risk coming into contact with sparks or
naked flames. For example, electric machines, electric
motors, electrical switches/power switches, heaters or the
like.
• To ensure that people, animals or other things cannot affect
your control of the machine.
• To ensure that the above mentioned do not come into
contact with the cutting equipment or objects that can be
thrown by the cutting equipment.
• When storing and transporting fuel approved containers
intended for this purpose must be used.
NOTE! Never use a machine without the possibility of
calling for help in the event of an accident.
• When storing the machine for long periods the fuel tank
must be emptied. Contact your local petrol station to find
out how to dispose of excess fuel.
2. Avoid usage in un-favourable weather conditions. For
example, thick fog, heavy rain, strong winds or extreme
cold, etc. To work in bad weather conditions is tiring and
can create dangerous circumstances, e.g. slippery surfaces.
WARNING!
Exercise great care when handling fuel.
!
3. Make sure you can walk and stand safely. Look out for any
obstacles with unexpected movement (roots, stones,
branches, pits, ditches , etc). Take great care when working
on sloping ground.
Bear in mind the risk of fire, explosions
and inhaling fumes.
4. When moving over
longer distances and
transporting the engine
should be stopped and
the transport guard
should be used.
General working instructions
IMPORTANT INFORMATION
• This section takes up the basic safety
precautions for working with the pruner.
• If you encounter a situation where you are
uncertain how to proceed you should ask an
expert. Contact your dealer or your service
workshop.
5. Never put the machine
down with the engine
running unless you have
good sight of it.
• Avoid all usage which you consider to be beyond
your capability.
6. Never allow childern to
use the machine.
English – 13
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SAFETY INSTRUCTIONS
• When working with the
Basic clearing techniques
• Always work with the engine at full throttle.
cutting equipment at
varying heights slide with
the throttle handle on the
shaft. Keep your feet in
position.
• Always drop to idling speed after each working operation.
Longer periods running at full throttle without loading the
engine can lead to serious engine damage.
• Never saw in the knot
seat (it accelerates waxing
and counteracts rot)!
WARNING!
Never stand immediately below a branch
!
being cut. This can result in serious or
even fatal injury.
• Fit the guard on the blade
to prevent unintentional
sawing in the tree.
Observe great care when working close to overhead power
lines. Falling branches can result in short-circuiting.
• Search for the correct
position in relation to the
branch. Work with the
shaft at an approx. 70°
angle so that if possible
the cut is at 90° to the
branch.
WARNING!
Observe the applicable safety regulations
for work in the vicinity of overhead cables.
!
• Do not work with shaft
held straight out from the
body (as with a fishing
rod). This increases the
strain of holding the
WARNING!
Check the shaft for cracks.
!
Clean the shaft each time it is used.
cutting equipment.
The length of the shaft is
adjustable within certain
• Use the support strap (A)
to simplify handling of
the shaft and relieve its
weight.
limits.
Release the wheel (A) and
push together or pull apart
the shaft to the required
length. Tighten the wheel
well after adjusting.
70°
A
WARNING!
Never use the throttle without having a
full view of the cutting equipment.
!
14– English
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WHAT IS WHAT?
7
1
11
10
6
5
9
4
3
8
2
16
19
13
14
12
20
23
18
17
15
24
22
21
26
27
25
What is what?
1. Cylinder cover
14. Throttle control
15. Guide bar
2. Start unit
16. Adjuster screw for oil
volume to chain
3. Fuel tank
4. Start handle
17. Telescopic shaft
18. Hydraulic motor
19. Chain
5. Choke control/start
throttle lock
6. Air filter cover
20. Owner's manual
21. Screw driver
22. Trunk guard
23. Transport guard
24. Toolbag
7. Suspension fitting
8. Hydraulic oil tank
9. Quick-couplings
10. High-pressure hose and
return hose
11. Cabling, ignition/throttle
control
25. Hex key (5 mm)
26. Hex key (4 mm)
27. Combination key
12. Stop switch.
13. Throttle control lock.
English – 15
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ASSEMBLY
Check that the coupling
snaps in correctly.
WARNING!
The cutting equipment of the pruning saw
may under no circumstances be connected
to another type of hydraulic pump than
what it is constructed for.
Lock the coupling by
pushing the ring (A) from
the tank and then turning it
approx. 90°.
!
A
Connecting the
hydraulic hoses
NOTE!
Dismantling the
hydraulic hoses
Release the extra lock by
turning the ring until it
snaps back to the hydraulic
tank. Push in the lock sleeve
and pull out the hose’s
quick-coupling.
The hydraulic hoses and
hydraulic oil tank’s quick-
couplings must be clean and
free from impurities.
Impurities in the hydraulic
oil can result in malfunction
of the hydraulic system.
Connect the hydraulic
hoses’ quick-couplings with
the hydraulic oil tank’s
quick-couplings.
NOTE!
Make sure the protecting
plugs are mounted when the
quick couplings are not
connected.
1. Push in the locking
sleeve on the quick
coupling of the hydrau-
lic tank inwards against
the tank.
2. Thereafter push in the
quick coupling of the
hydraulic hose into the
quick coupling of the oil
tank as far as possible.
3. Release the locking
sleeve.
Assembly of
throttle handle
Snap the throttle handle
onto the shaft.
4. Make sure the quick
coupling connects
securely.
5. Carry out the same procedure for the connection of the
other hydraulic hose.
The throttle handle can be
moved forwards or
backwards to obtain a
comfortable working
position.
Adapter
The shaft from the pruning
shears 235 P can also be
connected to 250 PS by
means of adapter 503 78 10-
01. Carefully check that
both couplings snap in
correctly. Connect the
hydraulic hose to the
adapter.
A
Check that the lock ring (A)
has sprung in to the oil
tank. If not, turn the ring
until it does.
Now press the coupling ring
(B) to the oil tank. Connect
the hydraulic hose and
release the coupling ring.
B
16– English
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FUEL HANDLING
Mixing
Fuel mix
• Always mix the petrol and oil in a clean container intended
for fuel.
NOTE!
The pruning saw is fitted with a two-stroke engine and must
always be run on a mixture of petrol and two-stroke oil. To
ensure the correct mixture proportions it is important to
measure the quantity of oil accurately. When mixing small
amounts of fuel small discrepancies in the amount of oil have
a big effect on the proportions of the fuel mixture.
• Always start by filling half the amount of petrol to be used.
Then add the entire amount of oil. Mix (shake) the fuel
mixture. Add the remaining amount of petrol.
• Mix (shake) the fuel mixture thoroughly before filling the
fuel tank.
• Do not mix more than max. one month’s supply of fuel.
WARNING!
• If the pruner is not used for some time the fuel tank should
be emptied and cleaned.
Always provide good ventilation when
handling fuel.
!
Petrol
• Use unleaded or leaded
high octane petrol mixed
with oil.
Gasolin
Benzin
Essence
Gasolina
Lit.
Oil • Öl
Huile • Aceite
Lit.
• The lowest octane
recommended is 90. If
you run the engine on a
lower octane grade than
90, so-called knocking can
occur. This gives rise to a
high engine temperature,
which can result in serious
engine damage.
3% (1:33)
2% (1:50)
0,10
0,15
0,30
0,45
0,60
5
0,20
0,30
0,40
10
15
20
US
gallon
US
fl. oz.
• For work with
2% (1:50)
2 1/2
6 1/2
12 7/8
3% (1:33)
3 3/4
9 3/4
19 1/4
continuously high revs a
higher octane rating is
recommended.
1
2 1/2
5
Twostroke oil
Fuelling
• For the best results use
Husqvarna twostroke oil.
Mixing ratio 1:50 (2%).
WARNING!
The following precautions reduce the risk
of fire:
!
• If Husqvarna twostroke
oil is not available, you
may use another two-
stroke oil of good quality
that is intended for air
cooled engines. Contact
your dealer when selecting
an oil. Mixing ratio 1:33
(3%).
Do not smoke or place any sources of heat
in the vicinity of the fuel. Never refuel when
the engine is running. Always stop the
engine and let it cool for a few minutes
before refuelling. Open the fuel cap slowly
when fuelling so that any over pressure is
released slowly. Tighten the fuel cap
carefully after refuelling. Always move the
machine from the fuelling place before
starting.
• Never use twostroke oil
intended for water cooled
outboard engines, so-
called outboard oil.
• Never use oil intended for
four-stroke engines.
English – 17
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FUEL HANDLING – START AND STOP
• Clean around the fuel cap.
Start and stop
Contamination in the
tank can disrupt opera-
tions.
WARNING!
• Always move the machine from the place
of filling before starting.
!
• Ensure that the fuel is well
mixed by shaking the
container before filling the
tank.
• Place the machine on a solid surface.
Check that you stand steady when
starting the engine.
• Make sure no unauthorized persons are
within the working area.
NOTE!
Never start the engine
without replenishing the
hydraulic oil and with the
hydraulic hoses fitted.
Running the engine without
hydraulic oil and without
the hoses fitted can result in
malfunction to the hydraulic
system.
Cold engine
IGNITION:
Set the stop switch in start
position.
Hydraulic oil
CHOKE:
ISO VG 32 hydraulic oil is
recommended where the air
temperature is below 20ºC.
ISO VG 45 hydraulic oil is
recommended if the air
Set the choke lever in the
choke position.
temperature is above 20ºC.
We also recommend any
equivalent grade of approved
biodegradable hydraulic oil.
Varm engine
Use the same procedure as
for the cold engine but do
not set the choke lever in
the choke position.
CAUTION!
Start throttle is obtained by
first moving the choke lever
to the choke position and
then back to the initial
position.
The oil’s flash point must be
greater than +160°C. Fill
the hydraulic oil until its
level is visible in the sight-
glass. Check the level of the
hydraulic oil each time you
refuel.
Stop
The engine is stopped by
switching the ignition off.
Fill with hydraulic oil until
the level lies between the
”Min” and ”Max” markings
on the oil stick. Screw down
the tank cap completely after
each check.
18– English
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START AND STOP
WARNING!
Fitting the
harness
Starting with the start throttle function
connected can give an uncontrolled
activation of the cutting equipment.
!
• Put on the harness with
engine unit.
Start
• Press together the hip
belt’s snap lock.
Press the machine body to
the ground with the left
hand. (NOTE: Not with the
foot!) Grip the start handle,
• Tension the hip belt so
that it rests on the hips.
• Tension both shoulder
belts so that the harness
presses to the back.
pull the start line slowly out
with the right hand until a
resistance is felt (the start
hooks engage) and then make
a quick and strong pull.
Open the choke
control immediately when the engine ignites and make
repeated attempts to start until the engine starts. When the
engine starts, give full throttle and the start throttle will
automatically disconnect.
NOTE!
Do not pull the starter cord out completely and do not release
the start handle from the fully drawn position. This can cause
damage to the engine.
NOTE!
Removing the
harness
An new machine which is
started for the first time
should be run for a maxi-
mum of half a minute with
repeated throttle starts, after
which hydraulic oil must be
replenished in the hydraulic
oil tank until the level is
correct. Repeat this
• Switch off the engine.
• Release the hip belt’s snap
lock.
• Pull one arm out of the
shoulder belt and lower
the harness and engine
unit to the ground with
the other hand.
procedure until the level in
the hydraulic tank stabilises.
Quick release in
case of hazard
• Pull out the red strap.
WARNING!
• The hip belt and one
shoulder belt will be
automatically released at
the same time and the
harness and engine unit
will slide to the ground.
The hydraulic oil can during and after use
be very hot. Avoid contact with the skin.
!
Connection of
the engine unit
• Hang the engine unit on
the harness.
• Make sure the hydraulic
hoses are on the right side
of the harness (viewed
from behind). Exhaust
fumes will then be directed
backwards, away from the
harness.
A
• Fit the lock spring (A).
English – 19
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MAINTENANCE
Fine adjustment
Carburettor
• When the tree pruner is ”run in” the carburettor should be
fine adjusted. Fine adjustment should be carried out by
trained personnel. The L-nozzle is adjusted first, then the
H-nozzle and finally the idling screw T. The following revs
recommendations are applicable:
Your Husqvarna product has been designed and
manufactured to specifications that reduce harmful
emissions.
After your unit has been run 8-10 tanks of fuel the engine
has broken in. To ensure that your unit is at peak
performance and producing the least amount of harmful
emissions after break in, have your authorized servicing
dealer, who has a revolution counter at his disposal, to adjust
your carburettor for optimum operating conditions.
Max. race revs = 11 000, rpm
Idling revs
= 2 500, rpm
Prerequisites
• During all adjustment the air filter should be clean and the
cylinder casing fitted.
WARNING!
• Carefully screw in (clockwise) the L- and H-nozzles to the
bottom.
Do not start the engine without the
!
Then unscrew (anti-clockwise) the nozzles 1 turn. The
carburettor now has the setting H = 1 and L = 1.
• Start the pruner as per the starting instructions and run for
about 10 minutes until it is warm.
hydraulic tank and hoses connected. If
you do, the clutch might come loose and
cause severe injuries.
Functioning
NOTE!
L
H
• The carburettor governs
the engine speed via the
throttle trigger. In the
carburettor, air/fuel is
mixed. This air/fuel
If the chain rotates during idling the T-screw should be turned
anti-clockwise until the chain stops.
• Place the pruner on a flat surface so that the blade is
pointing away from you and not in contact with the surface
or any other object.
mixture is adjustable. If
you want to take advan-
tage of the maximum
power output of the
engine, the setting must be
correct.
Low speed nozzle L
Search for the highest idling revs by means of slowly screwing
the low speed nozzle clockwise or anti-clockwise. When the
highest revs have been found screw the L-nozzle anti-
clockwise 1/4 turn.
• The setting of the
carburettor means that the
engine is adjusted to local
conditions, for example
climate, altitude, petrol
and type of two-stroke oil.
NOTE!
T
If the chain rotates during idling the T-screw should be turned
anti-clockwise until the chain stops.
High speed nozzle H
The high speed nozzle H affects the engine output and revs. A
lean mixture of the high speed nozzle (H-nozzle screwed in
too far) gives over-revs resulting in damage to the engine.
Run the engine at full throttle for about 10 seconds.
The H-nozzle is correctly adjusted when the saw putters
slightly. If there is excessive smoke from the exhaust while the
pruner is puttering excessively the setting is too rich. Turn the
H-nozzle clockwise until the setting sounds right.
• The carburettor has three adjustment possibilities:
L = Low speed needle
H = High speed needle
T = Idle speed adjustment screw
• The fuel quantity required in proportion to the airflow the
throttle trigger position allows is adjusted by means of the
L- and H-needles. Turning the needles clockwise gives a
leaner fuel mixture (less fuel), turning them counter-
clockwise gives a richer fuel mixture (more fuel). A lean
mixture gives higher rpms and a rich one lower rpms.
• The idling speed screw (T) regulates the position of the
throttle lever in the idling speed position. Turning the
idling speed screw clockwise gives a higher idling speed,
turning it counter-clockwise gives a lower idling speed.
NOTE!
To obtain an optimal setting contact a professional with access
to a tachometer.
Fine adjustment of idling T
The setting of the idling speed is done with the screw marked
T. If adjustment is necessary screw in (clockwise) the idling
screw T with the engine running until the chain starts to
rotate. Then open (anti-clockwise) until the chain stands still.
The correct setting of the idling revs is obtained when the
engine works regularly in all positions with a good margin
until the revs when the chain begins to rotate.
Basic setting
The carburettor is adjusted to a basic setting at the factory.
The basic setting is richer than the optimum setting and shall
be maintained during the first working hours. The carburettor
should be fine adjusted. The basic setting can be varied
between H = 1 to 1 1/4 turns and L = 1 1/4 turns.
WARNING!
Contact your servicing dealer, if the idle
!
speed setting cannot be adjusted. Do not
use the pruner until it has been properly
adjusted or repaired.
NOTE!
If the chain rotated during idling the T-screw should be
turned anti-clockwise until the chain stops.
20– English
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MAINTENANCE
Correctly adjusted carburettor
Muffler
A correctly adjusted carburettor implies that the engine
accelerates without a pause and that the engine splutters
slightly at full throttle. Also, the chain does not rotate at
idling speed. An excessively lean setting for the L-nozzle can
result in starting difficulties and poor acceleration. An
excessively lean H-nozzle setting results in a lower output,
poor acceleration, and/or damage to the engine.
The muffler is designed in
order to reduce the noise
level and to direct the
exhaust gases away from the
operator. The exhaust gases
are hot and can contain
sparks, which may cause fire
if directed against dry and
combustible material.
An over rich setting of both L and H results in acceleration
problems or excessively low working revs.
Some mufflers are equipped
with a special screen. If your
saw has this type of muffler,
you should clean the screen
at least once a week. This is
done with a wire brush. The
screen must be replaced, if
damaged. The engine will
be overheated, if the screen
is clogged. This results in
damage on the cylinder and
the piston.
Air filter
The air filters must be regularly cleaned from dust and dirt in
order to avoid:
• Carburettor malfunctions
• Starting problems
• Engine power reduction
• Unnecessary wear on the engine parts
• Abnormal fuel consumption
Cleaning/change
CAUTION!
Clean the filter after 25
hours or more regularly if
operating conditions are
exceptionally dusty.
Never use a pruner with a
clogged or defective muffler.
Dismantle the air filter
cover and remove the air
filters. Wash in clean, warm
soapy water.
Spark plug
The spark plug condition is
influenced by:
Ensure that the filters are
dry before refitting.
• An incorrect carburettor
setting.
An air filter used for a long
period of time can never be
cleaned completely.
Therefore it is necessary to
replace the filter from time
to time with a new filter.
0,5 mm
• An incorrect fuel mixture
(too much or faulty oil).
• A dirty air filter.
These factors cause deposits
on the spark plug
A damaged air filter must
always be replaced.
electrodes, which may result
in malfunction and starting
difficulties.
If the engine is low on power, difficult to start or runs
poorly at idling speed, always check the spark plug first.
If the spark plug is dirty, clean it and check the electrode gap.
Readjust if necessary. The correct gap is 0.5 mm (.020"). The
spark plug should be replaced after about one month or
earlier if the electrodes are badly eroded.
IMPORTANT!
Always use the recommended spark plug type. Wrong type
may ruin the piston/cylinder.
English – 21
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MAINTENANCE
4
Cooling system
Maintenance schedule
To maintain as low an
operating temperature as
possible the engine is
equipped with a cooling
system.
Below follows some general maintenance instructions.
If you need further information please contact your service
workshop.
The cooling system consits
of:
Daily maintenance
1
1. Clean the outside of the
1. An air intake on the
starter unit.
machine.
2. Fins on the flywheel.
2. Check that the harness is
undamaged.
1
2
3. Cooling fins on the cylinder.
4. Cylinder cover (leads cold air onto the cylinder).
3. Make sure the throttle
trigger lock and the
throttle function correctly
from a safety point of
Clean the cooling system using a brush at least once a week,
in difficult conditions more often.
A dirty or blocked cooling system leads to engine
overheating resulting in damage to the cylinder and
piston.
view.
3
4. Check that the stop
switch functions.
Cleaning of the
shaft
Clean the shaft every time it
is used.
5. Check that the chain does
not move at idling speed.
6. Clean the air filter.
4
Dirt which penetrates into
cracks in the shaft can
conduct electricity and result
in personal injury in the
event of contact with an
electric cable.
Replace if necessary.
7. Check hoses and hose
connections for damage
and wear.
5
8. Check the cutting
equipment regarding
damage, wear and oil
leakage.
6
Adjustment of the ball joint
9. Check that all nuts and
screws are tightened.
WARNING!
The engine must not be running during
adjustment.
!
7
The fixture for the cutting
tool is provided with a ball
joint so that it is easy to
change the cutting angle
during work.
It is important the joint
round the ball joint is
correctly adjusted.
8
Tighten the locking nut for a
more rigid ball joint.
Loosen the locking nut for a more manoeuvrable ball joint.
9
22– English
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MAINTENANCE
Weekly
maintenance
Monthly
maintenance
1
1
1.Check the starter, the
starter cord and the return
spring.
1.Clean the fuel tank using
petrol.
2.Clean the carburettor and
the space surrounding it.
2.Make sure that the
vibration damping
elements are not damaged.
2
4
2
3.Clean the fan and the space
around it.
3.Clean the outside of the
spark plug. Remove and
check the electrode gap.
Adjust the gap to 0.5 mm
(.020") or change the spark
plug.
3
3
4.Check the fuel filter and the
fuel pipe, replace if
necessary.
4
5.Check all cables and
connections.
5
4.Clean the fins on the
flywheel.
5
6.Replace the spark plug.
5.Clean or replace the spark
arrest screen on the
silencer.
7. Clean the inside of the
hydraulic tank.
6
6
6.Clean the carburettor
space.
7
7
7.Clean the cooling fins on
the cylinder and check that
the air intake in the starter
housing is not blocked.
8
8.Clean the air filter.
English – 23
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TECHNICAL DATA
Vibration levels
Equivalent sound pressure level
as per ISO 7505 max. output speed,
unloaded engine.
Technical data
Engine
Cylinder capacity, cm3
48,7
Cylinder bore, mm
44,0
Left (shaft) idling/max. output speed, m/s2
1,0/1,9
1,0/2,1
Stroke, mm
32,0
Right (throttle handle) idling/max.
output speed, m/s2
Idling speed, rpm
2 500
Recommended race speed, rpm
Max. engine output, acc. to. ISO 8893
11 500
2,1 kW/9 500 rpm
Hydraulic transmission
Hydraulic motor, capacity, cm3/rev
Hydraulic pump, capacity, cm3/rev
1,4
1,2
Working pressure, high pressure hose, bar 130
Flow, l/min
2–13
Ignition system
Manuafacturer/type of ignition system
Spark plug
Electrolux, ET
Champion RCJ 7Y
0,5
Electrode gap, mm
Fuel/oil system
Manufacturer/type of carburettor
Volume, fuel tank, litre
Walbro HDA 86
0,90
Volume, hydraulic oil tank, litre
Type of chain lubrication
1,30
Automatic
Weight
Engine unit without cutting equip., kg
7,0
Shaft with cutting equipment, kg
2 m
3 m
4 m
6 m
2,2
2,4
2,9
4,0
Noise levels
Equivalent noise level at ear level,
with a balance between idling/max.
output speed, unloaded engine of 50 %/
50 % , Lp balanced, dB(A)
94
Equivalent noise level at a balance
between idling /max. output speed,
unloaded engine of 50 % / 50 %
Lw balanced, dB(A)
108
24– English
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TECHNICAL DATA
Bar and chain combinations
The following combinations are CE approved.
Bar
Chain
Length,
inches
Pitch,
inches
Max. no of teeth
on tip sprocket
10
12
3/8
3/8
7 T
7 T
Oregon 90 SG
Oregon 90 SG
L
1
5
Type
Inch
3/8"
Inch/mm
0,028"/1,1
Inch/mm
Angle
Angle
Angle
Inch/mm
Inch/cm: dl
90 SG
5/32" /4,0
85°
30°
0°
0,025"/0,65
10"/25:40
12"/30:45
English – 25
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EU declaration of conformity (Only applies to Europe)
(Directive 89/392/EEC, Annex II, A)
We, Husqvarna AB, S-561 82 Huskvarna, Sweden, tel. +46 36-146500, declare under sole responsibility that the
pruner Husqvarna 250PS from the serial numbers of 1997 and onwards (the year is clearly stated in plain text on the
type plate with subsequent serial number), is in conformity with the following standards or other normative documents
following the provisions in the COUNCIL’S DIRECTIVES:
-
-
of June 14 1989 “relating to machinery” 89/392/EEC and applicable supplements.
of May 3 1989 “relating to electromagnetic compatibility” 89/336/EEC, and applicable supplements.
The following standards have been applied: EN292-2.
SMP Svensk Maskinprovning AB, Fyrisborgsgatan 3, S-754 50 Uppsala, Sweden, has carried out voluntary type
approval for Husqvarna AB. The certificate is numbered: SEC/94/060.
Huskvarna October 21, 1997
Bo Andréasson, Development manager.
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2001W14
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