Husqvarna 335XPT Workshop Manual page 11

High rpm
Will not run at full Adjust H-screw
throttle
Blocked air filter
Blocked fuel tank ventilator
Blocked fuel filter
Fuel line blocked
Loose or damaged fuel line
Impulse channel leaking
Impulse channel blocked
Loose cover on carburettor pump side
Faulty pump diaphragm
Leaking manifold (rubber)
Loose carburettor mounting bolts
Control system set too low
Control system damaged
Control system incorrectly assembled
Leaking control diaphragm/cover
Control system sticking
Blocked muffler
Low power
Adjust H-screw
Blocked fuel tank ventilator
Blocked fuel filter
Impulse channel leaking
Impulse channel blocked
Loose cover on carburettor pump side
Faulty pump diaphragm
Blocked air filter
Control system sticking
Leak in throttle system (air or fuel)
Control system incorrectly assembled
Loose diaphragm
Hole in diaphragm
Leaking control diaphragm/cover
Will not "four-stroke" Blocked fuel tank ventilator
Blocked fuel filter
Fuel line blocked
Loose or damaged fuel line
Impulse channel leaking
Impulse channel blocked
Loose cover on carburettor pump side
Faulty pump diaphragm
Leaking manifold (rubber)
Loose carburettor mounting bolts
Control system set too low
Leak in throttle system (air or fuel)
Control system incorrectly assembled
Loose diaphragm
Hole in diaphragm
Leaking control diaphragm/cover plate
TROUBLE SHOOTING
Acceleration and retardation
Trouble shooting methods
In addition to faults given in the above schematic, trouble
shooting can be carried out on a specific component or sub-
system of the chain saw. The different testing procedures are
described in respective sections and are as follows:
1.
2.
Does not accelerate Adjust L-screw
Adjust H-screw
Blocked air filter
Blocked fuel tank ventilator
Blocked fuel filter
Fuel line blocked
Loose or damaged fuel line
Impulse channel blocked
Loose cover on carburettor pump side
Faulty pump diaphragm
Leaking manifold (rubber)
Loose carburettor mounting bolts
Control system set too low
Control system incorrectly assembled
Control system sticking
Faulty diffuser jets
Blocked muffler
Engine stalls when Adjust L-screw
throttle is released
Adjust H-screw
Faulty pump diaphragm
Control system set too high
Control system sticking
Faulty diffuser jets
Too rich acceleration
Adjust L-screw
Adjust H-screw
Blocked air filter
Faulty pump diaphragm
Faulty diffuser jets
Pressure testing the carburettor.
See page 30.
Pressure testing the crankcase and cylinder.
See page 41.
11
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