Nilfisk-Advance SW900, Service Manual

Page: 89 / 137

Petrol Engine System 89 Service Manual – SW900
Troubleshooting
Trouble Possible causes Remedy
The engine does not start when pulling the
handle.
The ignition key is not turned to “I”. Turn the ignition key to “I”.
The fuel valve is closed. Open the fuel valve.
The fuel tank is empty. Refuel.
The hopper or the upper hood is not in its
proper position.
Adjust.
The fuel does not reach the carburetor. Check if the fuel reaches the carburetor.
The spark plug does not produce a spark. The spark plug does not produce a spark.
The hopper microswitch is broken. Replace the microswitch.
The engine stops during operation.
The engine oil level is insufficient. Add engine oil.
The fuel tank is empty. Refuel.
The hopper microswitch is broken. Replace the microswitch.
The engine does not start
The fuel valve is closed (OFF position). Turn the lever to ON position.
The choke lever is open.
Turn the lever to CLOSED position unless
the engine is hot.
The fuel quality is poor; the engine has been
stored without performing fuel treatment or
without draining it; the machine has been re -
fuel with poor quality gasoline.
Drain the fuel tank and the carburetor.
Refuel with fresh gasoline.
The fuel tank is empty. Refuel.
The spark plug is damaged, dirty or the dis -
tance between the electrodes is wrong.
Correct the distance between the electrodes
or replace the spark plug.
The spark plug is wetted with fuel (flooded
engine).
Dry the spark plug and reinstall it. Start the
engine with the throttle lever to MAX posi -
tion, and the choke lever to OPEN position.
The fuel filter is clogged, the carburetor is
broken, the start system is broken, the valves
are locked, etc.
Replace or repair the damaged parts as
necessary.
The engine loses power.
The filter element or elements are clogged Clean or replace the filter elements.
The fuel quality is poor; the engine has been
stored without performing fuel treatment or
without draining it; the machine has been re -
fuel with poor quality gasoline.
Drain the fuel tank and the carburetor. Re -
fuel with fresh gasoline.
The fuel filter is clogged, the carburetor is
broken, the start system is broken, the valves
are locked, etc.
Replace or repair the damaged parts as
necessary.