469545_e
39
Maintenance and care
■
Unscrew the spark plug (18/3) using a
spark plug spanner (18/2).
2. Assessing the condition of the spark plug:
■
If the spark plug is reddish-brown: The
engine is working correctly and the spark
plug is in order. If necessary: Carefully
brush the spark plug clean using a fine
wire brush (18/4).
■
If the spark plug is sooty, oily, encrusted,
melted or bridged: The spark plug is de-
fective. Replace the spark plug with a
new spark plug. Use the specified spark
plug type (see
■
If, after a short period of operation, the
spark plug is defective again, the engine
and the carburettor settings must be
checked by an authorised service work-
shop.
3. Check the electrode spacing:
■
Use a feeler gauge (18/5) to check that
the electrode gap (18/6) is 0.6 – 0.7 mm.
If not, carefully tap the electrodes closer
together or carefully bend them apart.
4. If the specified interval is reached or the
spark plug is defective:
■
Replace the spark plug with a new spark
plug. Use the specified spark plug type
(see
5. Installing the spark plug:
■
Ensure the spark plug seal ring (18/7) is
on the spark plug.
■
Screw in the spark plug again by hand
and tighten using the spark plug spanner
(torque 12 – 15 Nm).
■
Push on the spark plug connector again
firmly.
8.4
Sharpening line cutter (19)
1. Loosen the mounting screws (19/1).
2. Clamp the line cutter (19/2) in a vice and
sharpen it using a file. File in one direction
only.
3. Attach the line cutter to the guard plate (19/3)
again using the mounting screws. Tighten the
mounting screws firmly.
8.5
Maintenance schedule
The following jobs are allowed to be carried out
by the user independently. All other maintenance,
service and repair work must be carried out in an
authorised service workshop.
NOTE
Shorter maintenance intervals than
those stated in this table may be neces-
sary in case of severe loading and high
temperatures.
Activity
Once
after 5
operat-
ing
hours
Before
each
use
Every
week
Every
50 op-
erat-
ing
hours
Every
100 op-
erating
hours
If re-
quired
Every
year be-
fore the
mowing
season
Carburettor
Check idling speed
X
Air filters
Clean
X
Renew
X
Spark plug
Check electrode gap, ad-
just if necessary
X
Renew
X
X
Cooling air inlet
Clean
X
X
X
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