TROUBLE SHOOTING

High rpm

Will not run at full

Adjust H-screw

throttle

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

 

 

Low power

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

 

 

Will not

Fuel line blocked

”four-stroke”

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.

English – 41

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Image 41
Husqvarna 1018855-26, 965030298, 965030296 manual Trouble shooting methods, High rpm, Acceleration and retardation

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