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MAINTENANCE
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.
CAUTION! The screen must be replaced, if damaged. The saw
will be overheated, if the screen is clogged. This results in
damage on the cylinder and the piston. Never use a saw with a
clogged or defective muffler.
Needle bearing maintenance
The clutch drum is equipped
with one of the following chain
sprockets:
• Spur sprocket (A) (the chain
sprocket is welded on the
drum)
• Rim sprocket (B)
(exchangeable)
Both versions have buit-in
needle bearing at the drive
shaft, whitch has to be
greased regularly (once a
week).
NOTE! Use only high quality
bearing grease.
A
B
Air filter
The air filter must be regularly cleaned from dust and dirt in
order to avoid:
• Carburetor malfunctions
• Starting problems
• Engine power reduction
• Unnecessary wear on
the engine parts
• Abnormal fuel consumption
Clean the air filter daily or
more often if the air is
exceptionally dusty in the
working area.
• Disassemble the air filter by
removing the cylinder cover
and unscrew the filter.
When reassembling, make
sure that the filter is tight
against the filter holder.
Clean the filter by brushing
or shaking it.
• A more thorough cleaning of the filter is obtained by washing
it in water and soap.
An air filter, which is used for some time, cannot be cleaned
completely. Therefore it must be replaced by a new one, with
regular intervals.
IMPORTANT! A damaged air filter must always be replaced.
Muffler
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. Some mufflers are equipped with
Adjustment of the oil pump
The oil pump is adjustable.
Adjustments are made by
turning the screw using a
screwdriver or combination
spanner. The saw is supplied
from the factory set to 1 turn
open. Turning the screw
clockwise will reduce the oil
flow and turning the screw
anti-clockwise will increase
the oil flow.
Recommended settings:
Bar 18“-20“: 0 turns from the closed position.
Bar 20“-24“: 3/4 turns from the closed position.
Bar 24“-28“: 1 1/2 turns from the closed position.
Bar 28 and longer: 1 3/4 turns from the closed position.
These recommendations apply to Husqvarna’s chain oil, for
other chain oil increase the oil flow by one step.
WARNING! The engine must not be running
when making adjustments.
!
Spark plug
The spark plug condition is
influenced by:
• An incorrect carburetor
setting.
• Wrong fuel mixture (too
much oil in the gasoline).
• A dirty air filter.
These factors cause deposits
on the spark plug 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 (0,020"). The
spark plug should be replaced after about a month in operation
or earlier if the electrodes are badly eroded.
IMPORTANT! Always use the recommended spark plug type.
An incorrect spark plug can severely damage the piston/
cylinder.
0,5 mm