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Fault
Cause
Remedy
not properly fastened
to socket.
Spark plug dirty,
damaged or elec‐
trode gap incorrect.
► Clean or replace spark plug.
► Adjust electrode gap.
Oil bath air filter dirty. ► Clean or replace oil bath air filter.
Engine flooded.
► Remove spark plug and dry; set main switch to 0 and
pull starter rope repeatedly with spark plug removed.
Carburettor iced up. ► Allow tiller to warm up to +10 °C.
Engine difficult to
start or engine power
deteriorating.
Water in fuel tank
and carburettor or
carburettor blocked.
► Empty fuel tank, clean fuel line and carburettor.
Fuel tank contamina‐
ted.
► Clean fuel tank.
Oil bath air filter dirty. ► Clean or replace oil bath air filter.
Spark plug dirty.
► Clean or replace spark plug.
Incorrect fuel used.
► Check fuel.
Engine overheating.
Cooling ribs dirty.
► Clean cooling ribs.
Oil level in engine too
low.
► Top up engine oil.
Surface of engine
covered in earth.
► Remove earth from engine.
Engine speed too
high.
► Reduce speed.
Engine running
roughly.
Oil bath air filter dirty. ► Clean or replace oil bath air filter.
Incorrect fuel used.
► Check fuel.
Insufficient fuel in fuel
tank.
► Refill fuel tank.
Heavy smoke forma‐
tion.
Oil level in engine too
high.
► Drain engine oil.
Oil bath air filter dirty. ► Clean or replace oil bath air filter.
Angle of machine
inclination over 15°.
► Place machine in horizontal working position.
Excessive vibration
during operation.
Engine mounting
loose.
► Tighten engine mounting bolts.
Tilling performance
reduced.
Hoes incorrectly
installed.
► Install hoes correctly.
Hoes worn.
► Replace hoes.
Blade spur incorrectly
set.
► Adjust blade spur.
Blade spur incorrectly
set.
► Adjust blade spur.
Drive belt worn.
► Consult a STIHL specialist dealer.
Loud gearbox noise.
Incorrect oil level in
gearbox.
► Check oil level in gearbox.
Components in gear‐
box worn.
► Consult a STIHL specialist dealer.
Drive shaft does not
rotate when clutch
lever actuated.
Cable defective.
► Check or replace cable.
Drive belt worn.
► Consult a STIHL specialist dealer.
18 Troubleshooting
English
0478-404-9902-B
19