Spark Plug; Needle Bearing Lubrication; Adjustment Of The Oil Pump - Husqvarna 439 Manual De Instrucciones

with a new one at regular intervals. A damaged air filter
must always be replaced.
A HUSQVARNA chain saw can be equipped with different
types of air filters according to working conditions,
weather, season, etc. Contact your servicing dealer for
advice.

Spark plug

The spark plug condition is influenced by:
• An incorrect fuel mixture (too much or incorrect type
of oil).
• A dirty air filter.
These factors cause deposits on the spark plug
electrodes, which may result in operating problems and
starting difficulties.
If the machine is low on power, difficult to start or runs
poorly at idle speed: always check the spark plug first
before taking any further action. If the spark plug is dirty,
clean it and check that the electrode gap is 0.026 inch
(0.65 mm).
0,65
The spark plug should be replaced after about a month in
operation or earlier if necessary.
Note! Always use the recommended spark plug type! Use
of the wrong spark plug can damage the piston/cylinder.
Check that the spark plug is fitted with a suppressor.
36 – English
MAINTENANCE

Needle bearing lubrication

The clutch drum has a needle bearing on the output shaft.
This needle bearing must be lubricated regularly (once a
week).
When lubricating, remove the clutch cover by loosening
the bar nut. Lay the saw on its side with the clutch drum
upwards.
Lubrication involves grease being squirted into the centre
of the crankshaft using a grease gun.

Adjustment of the oil pump

The oil pump is adjustable. Adjustments are made by
turning the screw using a screwdriver. The machine is
supplied from the factory with the screw set to middle
position. Turning the screw clockwise will reduce the oil
flow and turning the screw anti-clockwise will increase the
oil flow.
!
WARNING! The engine must be stopped
when making adjustments.