Husqvarna 340 User Manual download pdf (Page 12)

English – 11

Troubleshooting

Acceleration and retardation

Does not

accelerate

Engine stalls

when throttle

released

Over rich

acceleration

Adjust L screw

Adjust H screw

Blocked air filter

Blocked fuel tank vent

Blocked fuel filter

Fuel line blocked

Loose or damaged fuel hose

Impulse channel blocked

Loose cover on carburettor pump

side

Faulty pump diaphragm

Leaking air intake hose (rubber)

Loose carburettor mounting bolts

Needle valve set too low

Metering system incorrectly

assembled

Needle valve assembly sticking

Faulty diffuser jets

Blocked silencer

Adjust L screw

Adjust H screw

Faulty pump diaphragm

Needle valve set too high

Needle valve assembly sticking

Faulty diffuser jets

Adjust L screw

Adjust H screw

Blocked air filter

Faulty pump diaphragm

Faulty diffuser jets

Troubleshooting methods

In addition to the faults described in the above

table, trouble shooting can be carried out on

specific components or sub-systems of the

chainsaw. The various procedures are described in

the relevant chapters, see the contents page, as

follows:

• Checking the operation of the chain brake

• Measuring the resistance of the stop plate

• Pressure testing the carburettor

• Pressure testing the decompression valve

• Pressure testing the cylinder

Adjust H screw

Blocked air filter

Blocked fuel tank vent

Blocked fuel filter

Fuel line blocked

Loose or damaged fuel hose

Impulse channel leaking

Impulse channel blocked

Loose cover on carburettor pump

side

Faulty pump diaphragm

Leaking air intake hose (rubber)

Loose carburettor mounting bolts

Needle valve set too low

Metering system damaged

Metering system incorrectly

assembled

Leaking control diaphragm/cover

plate

Needle valve assembly sticking

Blocked silencer

Adjust H screw

Blocked fuel tank vent

Blocked fuel filter

Impulse channel leaking

Impulse channel blocked

Loose cover on carburettor pump

side

Faulty pump diaphragm

Blocked air filter

Needle valve assembly sticking

Leak in metering system (air or fuel)

Metering system incorrectly

assembled

Loose diaphragm rivet

Hole in diaphragm

Leaking control diaphragm/cover

plate

Blocked fuel tank vent

Blocked fuel filter

Fuel line blocked

Loose or damaged fuel hose

Impulse channel leaking

Impulse channel blocked

Loose cover on carburettor pump

side

Faulty pump diaphragm

Leaking air intake hose (rubber)

Loose carburettor mounting bolts

Needle valve set too low

Leak in metering system (air or fuel)

Metering unit incorrectly assembled

Loose diaphragm rivet

Hole in diaphragm

Leaking control diaphragm/cover

plate

Will not run at

full throttle

Low power

Will not “four-

stroke”

High rpm

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 51 52

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