TROUBLE SHOOTING

Trouble shooting schematic

Faults that can develop on the chain saw are divided into four groups as follows. In each cat- egory, 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

Adjust L-screw

 

Air filter blocked

 

Choke not working correctly

 

Worn choke shaft

 

Worn choke plate

 

Fuel filter blocked

 

Fuel line blocked

 

Piston ring seized

 

Blocked impulse channel

 

 

Carburettor

Loose or faulty fuel pipe

leaking fuel

Hole in diaphragm

 

Worn needle valve/needle

 

Control system sticking

 

Control system set too high

 

Leak in control system (air or

 

fuel)

 

Loose cover on carburettor

 

pump side

 

 

Flooding when

Worn needle valve

the engine is not

Control system set too high

running

Control system sticking

 

 

Idling (low rpm)

Will not idle

Adjust L-screw

 

Leaking manifold (intermediate)

 

Loose carburettor mounting

 

Loose or faulty fuel pipe

 

Fuel filter blocked

 

Fuel line blocked

 

Fuel tank breather blocked

 

Throttle shaft and lever stiff

 

Throttle cable sticking

 

Defective throttle return spring

 

Bent throttle lever shaft stop

 

Faulty diffuser jet

 

 

Idling too rich

Adjust L-screw

 

Worn needle valve/needle

 

Control system set too high

 

Worn throttle lever

 

Leaking control diaphragm/

 

cover plate

 

Control system sticking

 

 

Idling (low rpm) (cont.)

Idles when L-screw

Worn needle valve/needle

closed

Leaking control diaphragm/

 

cover plate

 

Control system sticking

 

Worn throttle lever

 

Faulty diffuser jet

 

 

Idling uneven

Fuel filter blocked

 

Fuel line blocked

 

Leaking manifold

 

Loose carburettor mounting

 

Worn throttle valve shaft

 

Loose throttle valve screw

 

Worn throttle valve

 

Control system sticking

 

Leak in throttle system (air or

 

fuel)

 

Control diaphragm centre knob

 

is worn

 

Hole in diaphragm

 

Leaking control diaphragm/

 

cover plate

 

Crankcase leaking

 

 

L-screw requires

Fuel line blocked

constant adjustment

Control system set too high

 

Control system sticking

 

Control system (air or fuel)

 

Leaking control diaphragm/

 

cover plate

 

Faulty diffuser jet

 

Crankcase leaking

 

 

Too much fuel at idling

Control system set too high

Control system sticking

 

Control system damaged

 

Worn needle valve

 

Leaking control diaphragm/

 

cover plate

 

Control system incorrectly

 

assembled

 

 

40 – English

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Image 40
Husqvarna 965030296, 965030298, 1018855-26 manual Trouble Shooting, Trouble shooting schematic, Starting, Idling low rpm

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