Trouble Shooting - Husqvarna 334T Workshop Manual

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High speed
Will not run at full Adjust H-screw
throttle
Blocked air filter
Tank ventilator blocked
Blocked fuel filter
Blocked fuel line
Loose or faulty fuel pipe
Impulse channel leaking
Blocked impulse channel
Cover on the carburettor's pump side
is loose
Faulty pump diaphragm
Leaking inlet manifold (rubber)
Loose carburettor mounting
Control system set too low
Damaged control system
Incorrectly fitted control system
Leaking diaphragm/cover plate
Control system sticking
Blocked muffler
Adjust H-screw
Low power
Tank ventilator blocked
Blocked fuel filter
Impulse channel leaking
Blocked impulse channel
Cover on the carburettor's pump side
is loose
Faulty pump diaphragm
Blocked air filter
Control system sticking
Leaking control system (air or fuel)
Control system incorrectly assembled
Loose diaphragm
Hole in diaphragm
Leaking diaphragm/cover plate
Will not "four stroke"
Tank ventilator blocked
Blocked fuel filter
Blocked fuel line
Loose or faulty fuel pipe
Impulse channel leaking
Blocked impulse channel
Cover on the carburettor's pump side
is loose
Faulty pump diaphragm
Leaking inlet manifold (rubber)
Loose carburettor mounting
Control system set too low
Leaking control system (air or fuel)
Control system incorrectly assembled
Loose diaphragm
Hole in diaphragm
Leaking diaphragm/cover plate

TROUBLE SHOOTING

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Acceleration and retardation
Does not accelerate
Adjust the L-screw
Adjust H-screw
Blocked air filter
Tank ventilator blocked
Blocked fuel filter
Blocked fuel line
Loose or faulty fuel pipe
Blocked impulse channel
Cover on the carburettor's pump side
is loose
Faulty pump diaphragm
Leaking inlet manifold (rubber)
Loose carburettor mounting
Control system set too low
Incorrectly fitted control system
Control system sticking
Faulty diffuser jet
Blocked muffler
Adjust the L-screw
Engine stalls when
throttle is released
Adjust H-screw
Faulty pump diaphragm
Control system set too high
Control system sticking
Faulty diffuser jet
Too rich acceleration Adjust the L screw
Adjust H-screw
Blocked air filter
Faulty pump diaphragm
Faulty diffuser jet
Trouble shooting methods
In addition to faults given in the above schematic, trouble
shooting can be carried out on a specific component or specific
chain saw system. The different procedures are described in
respective sections and are as follows:
1. Pressure testing the carburettor. See the chapter
"Carburettor".
2. Pressure testing the crankcase and cylinder. See the
chapter "Crankshaft, Piston and Cylinder".
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