Husqvarna 555 Workshop Manual page 57

8.1 Troubleshooting
The different faults which may occur on the chain saw are di ided into four groups. Within each group
possible operating faults are listed to the left while the probable fault alternati es are listed to the right.
The most likely fault is listed rst, etc. See separate instruction for Autotune troubleshooting.
Starting
if cult to start Air lter blocked
Choke does not work
Worn choke a le
Worn choke al e
locked fuel lter
locked fuel line
Piston ring is stuck
locked 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 co er on the carburettor
pump side is loose
loods 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
oes not idle
Loose carburettor mounting
Loose or faulty fuel pipe
locked fuel lter
locked fuel line
Tank entilator blocked
The throttle al e shaft is inert
Throttle stay is binding
efecti e throttle return spring
ent al e a le stop
aulty diffuser et
Worn needle/needle tip
Too rich idling
Worn le er arm in the control
system
Leaking diaphragm/co er plate
Idling (low speed) (continued)
Worn needle/needle tip
Leaking diaphragm/co er plate
Worn le er arm in the control
system
aulty diffuser et
Une en idling locked fuel lter
locked fuel line
Leaking inlet hose rubber
Loose carburettor mounting
Worn throttle al e a le
Loose throttle al e screw
Worn throttle al e
Leaking control system
air or fuel
The control system s centre
knob is worn
Hole in diaphragm
Leaking diaphragm/
co er plate
Leaking crankcase
locked fuel line
Leaking control system
air or fuel
Leaking diaphragm/co er plate
aulty diffuser et
Leaking crankcase
Too much fuel at Worn needle/needle tip
idle speed Leaking diaphragm/
co er plate
Troubleshooting
57
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