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Before starting work, after filling the tank, after an im-
pact or if dropped:
• Check the cutting tools for firm seating, general
visual inspection for cracks and damage.
• Replace damaged or blunt cutting tools immediate-
ly, even with hairline cracks.
• Sharpen the cutting tools (also if necessary).
Weekly check:
• Gear lubrication (also if necessary).
If necessary:
• Tighten the accessible fastening screws and nuts.
Excessive wear and damage to the device can be
prevented if the specifications in this user manual are
adhered to.
13.2 Maintenance of the engine drive unit (1)
13.2.1 Replacing and cleaning the spark plug
(Fig. 21)
Check the electrode gap of the spark plug (49) at
least once a year or regularly if starting is poor.
The correct distance between the ignition flag and ig-
nition contact is 0.7 mm.
• Wait until the engine has cooled down completely.
• Remove the spark plug connector (6) from the
spark plug (49).
• Unscrew the spark plug (49) with the supplied spark
plug wrench (30).
• If the electrode is worn excessively or if it is very
encrusted, the spark plug (49) must be replaced
with one of the same type.
• Heavy incrustation on the spark plug (49) can be
caused by: Too high a proportion of oil in the petrol
mixture, poor oil quality, outdated petrol mixture, or
blocked air filter.
• Screw the spark plug (49) into the thread complete-
ly by hand. Avoid tilting the spark plug (49).
• Tighten the spark plug (49) with the supplied spark
plug wrench (30).
• When using a torque wrench, the tightening torque
is 12-15 Nm.
• Push the spark plug connector (6) back onto the
spark plug (49) properly.
13.2.2 Cleaning the air filter (Fig. 22)
Fouled air filters diminish the engine output due to
reduced air supply to the carburettor. Dust and pollen
clog the pores of the air filter. Regular inspection is
therefore essential.
• Loosen the air filter retaining screw (51).
• Tighten the air filter cover (50).
• Remove the air filter foam insert (52).
• Replace the air filter cover (50) so that nothing falls
into the air duct.
• Clean the air filter by knocking out or blowing out
with compressed air.
• Re-install the air filter in reverse order.
Attention:
Never clean the air filter with petrol or combustible
solvents.
In order to prolong the service life of the engine, a
damaged air filter must be replaced immediately.
m Warning!
Never leave the engine running if the air filter element
is not inserted.
13.2.3 Adjusting the carburettor
If the idle speed is too high or too low, the carburettor
must be adjusted.
Only have qualified personnel carry out carburettor
adjustments!
13.3 Maintenance of the brush cutter / grass trim-
mer (13)
13.3.1 Replacement of the thread coil/cutting
thread (Fig. 23-26)
• Remove the thread coil (16) from the brush cutter /
grass trimmer (13).
• Pull the coil cover (53) off the thread coil (16) by
firmly pressing the retaining lugs (54) (Fig. 23).
• Remove the thread holder (55) with the thread rem-
nants.
• Take the new thread holder and pull out 10 cm of
both threads.
• Now place the thread holder (55) on the conical
pointed spring and guide both threads through the
eyelets (56) on the thread coil (16).
• Now place the coil cover (53) on the new thread
coil. Turn it so that the recesses in the coil cover
(53) align with the eyelets (56) of the thread coil
(16).
• Now press the thread cover (53) together with the
thread holder (55) until it engages in the thread coil
(16).
• The cutting blade (14a) in the shield (14) shortens
the thread to the correct length when the machine
starts up again.
Alternatively, just the thread can be replaced:
• Remove the thread coil (16) from the brush cutter /
grass trimmer (13).
• Pull the coil cover (53) off the thread coil (16) by
firmly pressing the retaining lugs (54) (Fig. 23).
• Remove the thread holder (55) with the thread rem-
nants.
• Remove the thread remnants from the thread hold-
er (55).
• Take a new line in the middle and hook it to the
retaining lug (57) of the thread holder (55) (Fig. 25).
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