Husqvarna 371XP Workshop Manual page 10

For Husqvarna Parts Call 606-678-9623 or 606-561-4983
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Trouble shooting schematic
Faults that can develop on the chainsaw are divided into four
groups as follows. In each category, possible malfunctions
are shown on the left, with a list of possible faults on the right.
The most probable fault is given first and so on.
Starting
Difficult starting
Carburettor leaking
fuel
Flooding when motor
not running
Idling (low rpm)
Will not idle
Idling too rich
8 – English
TROUBLE SHOOTING
Adjust L-screw
Air filter blocked
Choke not working
Worn choke pivot
Worn choke butterfly
Fuel filter blocked
Fuel line blocked
Piston ring seized
Blocked impulse channel
Loose or faulty fuel pipe
Hole in diaphragm
Worn needle valve
Needle valve assembly sticking
Needle valve set too high
Leak in metering system (air or
fuel)
Loose cover on carburettor
pump side
Worn needle valve
Needle valve set too high
Needle valve assembly sticking
Adjust L-screw
Leaking air intake (rubber)
Loose carburettor mounting
bolts
Loose or faulty fuel pipe
Fuel filter blocked
Fuel line blocked
Fuel tank ventilator blocked
Throttle valve pivot stiff
Throttle cable sticking
Defective throttle return spring
Bent throttle stop
Faulty diffuser jet
Adjust L-screw
Worn needle valve
Needle valve set too high
Worn needle valve lever
Leaking control diaphragm/
cover plate
Needle valve assembly sticking
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Idling (low rpm) (cont.)
Idles when L-screw closed
Idling uneven
L-screw requires
constant adjustment
Too much fuel at idling
Worn needle valve
Leaking control diaphragm/
cover plate
Needle valve assembly sticking
Worn needle valve lever
Faulty diffuser jet
Fuel filter blocked
Fuel line blocked
Leaking air intake (rubber)
Loose carburettor mounting
bolts
Worn throttle butterfly pivot
Loose throttle butterfly screw
Worn throttle butterfly
Needle valve assembly sticking
Leak in metering system (air or
fuel)
Control diaphragm centre knob
is worn
Hole in diaphragm
Leaking control diaphragm/
cover plate
Crankcase leaking
Fuel line blocked
Needle valve set too high
Needle valve assembly sticking
Leak in metering system (air or
fuel)
Leaking control diaphragm/
cover plate
Faulty diffuser jet
Crankcase leaking
Needle valve set too high
Needle valve assembly sticking
Metering system damaged
Worn needle valve
Leaking control diaphragm/
cover plate
Metering system incorrectly
assembled