Husqvarna 1018855-26, 965030298, 965030296 Trouble Shooting, Trouble shooting methods, High rpm

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