English – 10
5.1 Trouble shooting chart
The different faults that can occur on the chainsaw
are divided into four groups as follows. Within each
group possible operating faults are listed to the left
while the probable fault alternatives are listed to the
right. The most likely fault is listed first, etc.
5 Trouble shooting
Trouble shooting
Starting
1
Difficult to start
Adjust the L-screw
Air filter blocked
Choke does not work
Worn choke axle
Worn choke valve
Blocked fuel filter
Blocked fuel line
Piston ring seized
Blocked impulse chan-
nel
2
Carburettor leaks
fuel
Loose or faulty fuel pipe
Hole in diaphragm
Worn needle/needle tip
Control system sticking
Control system set too
high Leaking control
system (air or fuel)
Loose cover on carburet-
tor
pump side
3
Floods when
engine is not run-
ning
Worn needle/needle tip
Control system set too
high Control system
sticking
Idling (low speed)
1
Does not idle
Adjust the L-screw
Leaking intake hose (rubber)
Loose carburettor mount-
ing Loose or faulty fuel pipe
Blocked fuel filter
Blocked fuel line
Tank ventilator blocked
Throttle valve axle stiff
Throttle wire sticks
Defective throttle return
spring
Bent valve axle stop
Faulty diffuser jet
2
Too rich idling
Adjust the L-screw
Worn needle/needle tip
Control system set too high
Worn lever arm in the control
system
Leaking diaphragm/cover
plate
Control system sticking
Idling (low speed) (continued)
1
Idles with closed
L-screw
Worn needle/needle tip
Leaking diaphragm/cover
plate Control system
sticking Worn lever arm
in the control system
Faulty diffuser jet
2
Uneven idling
Blocked fuel filter
Blocked fuel line
Leaking intake hose (rub-
ber)
Loose carburettor mount-
ing
Worn throttle valve axle
Loose throttle valve
screw
Worn throttle valve
Control system sticking
Leaking control system
(air or
fuel)
Worn centre knob in
control
system
Hole in diaphragm
Leaking diaphragm/cover
plate
Leaking crankcase
3
L-screw requires
constant adjust-
ment
Blocked fuel line
Control system set too
high
Control system sticking
Leaking control system
(air or
fuel)
Leaking diaphragm/cover
plate
Faulty diffuser jet
Leaking crankcase
4
Too much fuel
when idling
Control system set too
high
Control system sticking
Damaged control system
Worn needle/needle tip
Leaking diaphragm/cover
plate
Incorrectly fitted control
system
