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17 Repairing
WARNING
■ The cutting edges of the blade are sharp. This
may result in the user cutting themselves.
► Wear protective gloves.
► Stop the engine.
► Detach the spark plug socket.
► Upend the lawn mower.
► Remove the blade.
► Sharpen the blade. Observe the sharpening
angle and cool the blade,
Bluing of the blade during sharpening is not
permitted.
► Attach the blade.
► Connect the spark plug socket.
18 Troubleshooting
18.1
Remedying Lawn Mower Faults
Fault
Cause
Engine cannot
Control bar for mowing is not
be started.
pressed.
Fuel tank is empty.
Fuel line is blocked.
Inferior, dirty or old fuel in tank. ► Use fresh, good-quality unleaded petrol.
Air filter dirty.
Spark plug socket is detached
from spark plug or ignition lead
is not properly fastened to
socket.
Spark plug is dirty, damaged or
electrode gap is incorrect.
Resistance at blade is too great. ► Set a higher cutting height.
Engine diffi‐
Lawn mower housing is
cult to start or
blocked.
engine power
deteriorating.
Cutting height is set too low or
rate of feed is too high.
Water in fuel tank and carburet‐
tor or carburettor is blocked.
Fuel tank contaminated.
Air filter dirty.
Spark plug dirty.
Engine over‐
Engine oil level is too low.
heating.
Cooling ribs dirty.
Lawn mower
Blade is damaged.
vibrates
excessively.
Blade is not correctly attached.
0478-111-9861-A
19.2.
Remedy
► Start engine as described in this instruction
manual.
► Refuel lawn mower.
► Consult a STIHL specialist dealer.
► Clean or replace air filter as described in engine
instruction manual.
► Connect spark plug socket.
► Check connection between ignition lead and plug.
► Clean or replace spark plug.
► Adjust electrode gap.
► Start engine in lower grass.
Clean lawn mower.
Adapt cutting height or mow more slowly.
Empty fuel tank, clean fuel line and carburettor.
Consult a STIHL specialist dealer.
Clean or replace air filter as described in engine
instruction manual.
Clean or replace spark plug.
Add or change engine oil as described in engine
instruction manual.
Clean lawn mower.
Replace blade.
Attach blade.
► If anything is unclear: consult a STIHL special‐
ist dealer.
17 Repairing
17.1
Repairing the Lawn Mower
The user should not repair the lawn mower or
blade themselves.
► If the lawn mower or blade is damaged: do not
use the lawn mower or blade and consult a
STIHL specialist dealer.
► If warning signs are illegible or damaged: have
the warning signs replaced by a STIHL spe‐
cialist dealer.
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