High Rpm; Acceleration And Retardation; Trouble Shooting Methods - Husqvarna 36 Workshop Manual

High rpm

Will not run at full
throttle
Low power
Will not
"four-stroke"
TROUBLE SHOOTING
Adjust H-screw
Blocked air filter
Blocked fuel tankbreather
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
Loose carburettor mounting
Control system set too low
Control system damaged
Control system incorrectly
assembled
Leaking control diaphragm/cover
Control system sticking
Blocked silencer
Adjust H-screw
Blocked fuel tankbreather
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
Blocked fuel tank breather
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
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

Acceleration and retardation

Does not accelerate Adjust L-screw
Adjust H-screw
Blocked air filter
Blocked fuel tankbreather
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
Loose carburettor mounting
Throttle set too low
Control system incorrectly
assembled
Control system sticking
Faulty diffuser jet
Blocked silencer
Motor stalls when Adjust L-screw
throttle released Adjust H-screw
Faulty pump diaphragm
Control system set too high
Control system sticking
Faulty diffuser jet
Over rich accelera- Adjust L-screw
tion 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 sub-system of the chain saw. The
different testing procedures are described in
respective sections and are as follows:
1. Pressure testing the carburettor.
See page 100.
2. Pressure testing the crankcase and cylinder.
See page 114.
3. Pressure testing the decompression valve.
See page 114.
4. Checking the operation of the chain brake.
See page 47.
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