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Maintenance and care
3. Push the intake head into the fuel tank again.
4. Mix and pour in the petrol/oil mixture (see
chapter 5.1 "Mixing and pouring in the petrol/
oil mixture", page 33).
8.3
Maintaining the spark plug (17)
1. Removing the spark plug:
■
Remove the spark plug connector (17/1).
■
Unscrew the spark plug (17/3) using a
spark plug spanner (17/2).
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 (17/4).
■
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 (Technical data).
■
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 (17/5) to check that
the electrode gap (17/6) is 0.6 – 0.7 mm.
If not, carefully tap the electrodes closer
together or carefully bend them apart.
Activity
Carburettor
Check idling speed
Air filters
Clean
Renew
Spark plug
Check electrode gap, ad-
just if necessary
Renew
Cooling air inlet
442771_a
Once
Before
after 5
each
operat-
use
ing
hours
X
X
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
(Technical data).
5. Installing the spark plug:
■
Ensure the spark plug seal ring (17/7) 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 (18)
1. Loosen the mounting screws (18/1).
2. Clamp the line cutter (18/2) in a vice and
sharpen it using a file. File in one direction
only.
3. Attach the line cutter to the guard plate (18/3)
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 necessary in
case of severe loading and high temperatures.
Every
Every
week
50 op-
erat-
ing
hours
X
Every
If re-
Every
100 op-
quired
year be-
erating
fore the
hours
mowing
season
X
X
X
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