Husqvarna 555 XP Workshop Manual page 57

8.1 Troubleshooting
The different faults which may occur on the chain saw are divided into four groups. 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. See separate instruction for Autotune troubleshooting.
Starting
Difficult to start Air filter blocked
Choke does not work
Worn choke axle
Worn choke valve
Blocked fuel filter
Blocked fuel line
Piston ring is stuck
Blocked impulse channel
The carburettor Loose or faulty fuel pipe
leaks fuel Hole in diaphragm
Worn needle/needle tip
Control system sticking
Control system set too high
Leaking control system
(air or fuel)
The cover on the carburettor
pump side is loose
Floods when the Worn needle/needle tip
engine is not Control system set too high
running Control system sticking
Idling (low speed)
Leaking inlet hose (rubber)
Does not idle
Loose carburettor mounting
Loose or faulty fuel pipe
Blocked fuel filter
Blocked fuel line
Tank ventilator blocked
The throttle valve shaft is inert
Throttle stay is binding
Defective throttle return spring
Bent valve axle stop
Faulty diffuser jet
Worn needle/needle tip
Too rich idling
Worn lever arm in the control
system
Leaking diaphragm/cover plate
Idling (low speed) (continued)
Worn needle/needle tip
Leaking diaphragm/cover plate
Worn lever arm in the control
system
Faulty diffuser jet
Uneven idling Blocked fuel filter
Blocked fuel line
Leaking inlet hose (rubber)
Loose carburettor mounting
Worn throttle valve axle
Loose throttle valve screw
Worn throttle valve
Leaking control system
(air or fuel)
The control system's centre
knob is worn
Hole in diaphragm
Leaking diaphragm/
cover plate
Leaking crankcase
Blocked fuel line
Leaking control system
(air or fuel)
Leaking diaphragm/cover plate
Faulty diffuser jet
Leaking crankcase
Too much fuel at Worn needle/needle tip
idle speed Leaking diaphragm/
cover plate
Troubleshooting
57
English -