75
Lubricating system
6
Trouble shooting system
Cause Insufficient Leakage
lubrication
Blocked oil passage or lubrication hole in the bar ●●
Blocked oil tank vent ●
Defective pressure hose ●●
Wear on pin/cam in pump piston ●
Defective threads for fitting screws ●
Wear on pump cylinder/piston ●
Defective oil pick-up hose ●●
Blocked oil screen ●
Oil tank venting
Check that the ventilation functions by
increasing the air pressure in the oil tank.
Checking of pump
function
Check that the chain lubrication functions
by holding the bar against a light object
while running the engine at 3/4 throttle.
Oil tank venting
In order to avoid a vacuum developing in
the oil tank when the oil is consumed, and
thereby resulting in inferior chain lubrica-
tion, there is a ventilation passage built
into the crankcase. There are different
ventilation designs, see chapter 8 ”Crank-
shaft and crankcase”.
Check that the ventilation functions by
increasing the air pressure in the oil tank.
Checking of pump
function
Check that the chain lubrication functions.
Run the saw at 3/4 throttle for about one
minute.
Hold the bar against a stump or other light
object (at a distance of approx. 20 cm).
During this test a clear strand of oil should
develop on the light object.
Adjust the oil pump setting to obtain the
correct chain lubrication.
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