Husqvarna T525 Workshop Manual page 59

8.1 Troubleshooting
The different faults which may occur on the chain saw are divided into four groups. Within each group pos-
sible 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.
Starting
Stating Adjust the L-screw
difficulties Clogged air filter
Choke does not work
Worn choke shaft
Worn choke valve
The fuel filter is clogged
The fuel hose is clogged
Piston ring is stuck
Blocked impulse channel
The carburet- Loose or defective fuel hose
tor leaks fuel Hole in the membrane
Worn needle/needle tip
Control system is binding
Control system set too high
Leaking control system (air
or fuel)
The cover on the carburettor
pump side is loose
Floods when Worn needle/needle tip
the engine is Control system set too high
not running Control system is binding
Idling (low speed)
Does not run Adjust the L-screw
at idling Leaking inlet hose (rubber)
Loose clamping screws
carburettor
Loose or defective fuel hose
The fuel filter is clogged
The fuel hose is clogged
Tank venting clogged
The throttle valve shaft is
inert
Throttle stay is binding
Defective throttle return
spring
Bent valve shaft stop
Faulty diffuser jet
Too high Adjust the L-screw
idling speed Worn needle/needle tip
Control system set too high
Worn lever arm in the control
system
Leaking diaphragm/cover
plate
Control system is binding
Runs in idle Worn needle/needle tip
with closed Leaking diaphragm/cover
L-screw plate
Control system is binding
Worn lever arm in the control
system
Faulty diffuser jet
Irregular The fuel filter is clogged
idling The fuel hose is clogged
Leaking inlet hose (rubber)
Loose clamping screws
carburettor
Worn throttle valve shaft
The throttle valve screw is
loose
The throttle valve is worn
Control system is binding
Leaking control system (air
or fuel)
The control system's centre
knob is worn
Hole in the membrane
Leaking diaphragm/cover
plate
Crankcase leak
The L-screw The fuel hose is clogged
needs con- Control system set too high
stant adjust- Control system is binding
ment Leaking control system (air
or fuel)
Leaking diaphragm/cover
plate
Faulty diffuser jet Crankcase
leak
Too much fuel Control system set too high
on idling Control system is binding
Control system damaged
Worn needle/needle tip
Leaking diaphragm/cover
plate
Incorrectly fitted control
system
Troubleshooting
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