Husqvarna T525 - Page 59

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8.1 Troubleshooting
The dierent 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 rst, etc.
Troubleshooting
Starting
Stating
diculties
Adjust the L-screw
Clogged air lter
Choke does not work
Worn choke shaft
Worn choke valve
The fuel lter is clogged
The fuel hose is clogged
Piston ring is stuck
Blocked impulse channel
The carburet-
tor leaks fuel
Loose or defective fuel hose
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
the engine is
not running
Worn needle/needle tip
Control system set too high
Control system is binding
Idling (low speed)
Does not run
at idling
Adjust the L-screw
Leaking inlet hose (rubber)
Loose clamping screws
carburettor
Loose or defective fuel hose
The fuel lter 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 diuser jet
Too high
idling speed
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 is binding
Runs in idle
with closed
L-screw
Worn needle/needle tip
Leaking diaphragm/cover
plate
Control system is binding
Worn lever arm in the control
system
Faulty diuser jet
Irregular
idling
The fuel lter is clogged
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
needs con-
stant adjust-
ment
The fuel hose is clogged
Control system set too high
Control system is binding
Leaking control system (air
or fuel)
Leaking diaphragm/cover
plate
Faulty diuser jet Crankcase
leak
Too much fuel
on idling
Control system set too high
Control system is binding
Control system damaged
Worn needle/needle tip
Leaking diaphragm/cover
plate
Incorrectly tted control
system