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14.2 Maintaining the engine drive unit (1)
14.2.1 Replace and clean the spark plug (Fig. 21)
Check the electrode gap of the spark plug (70) at least once a year or
regularly if starting is poor.
The correct distance between the ignition flag and ignition contact is
0.7 mm.
• Wait until the engine has cooled down completely.
• Remove the spark plug connector (6) from the spark plug (70).
• Unscrew the spark plug (70) with the supplied spark plug wrench
(39).
• If the electrode is worn excessively or if it is very encrusted the spark
plug (70) must be replaced with one of the same type.
• Heavy incrustation on the spark plug (70) 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high a proportion of oil in the petrol mixture, poor oil quality, outdated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 (70) into the thread completely by hand. Avoid
tilting the spark plug (70).
• Tighten the spark plug (70) with the supplied spark plug wrench (39).
• When using a torque wrench, the tightening torque is 12-15 Nm.
• Push the spark plug connector (6) back onto the spark plug (70) prop-
erly.
14.2.2 Clean 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 foam insert (73).
Regular inspection is therefore essential.
• Loosen the air filter retaining screw (72).
• Tighten the air filter cover (71).
• Remove the foam insert (73).
• Replace the air filter cover (71) so that nothing falls into the air duct.
• Clean the foam insert (73) by knocking out or blowing out with com-
pressed air.
• Re-install the foam insert (73) in reverse order.
Attention:
Never clean the air filter with petrol or inflammable cleaning agents.
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.
14.2.3 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!
14.3 Maintenance of the trimmer / grass trimmer (12)
14.3.1 Replacement of the thread coil/cutting thread
(Fig. 23-26)
• Dismantle the thread coil (16) from the brush cutter / grass trimmer
(12).
• Pull the coil cover (65) off the thread coil (16) by firmly pressing the
retaining lugs (66) (Fig. 23).
• Remove the thread holder (67) with the thread remnants.
• Take the new thread holder and pull out 10 cm of both threads.
• Now place the thread holder (67) on the conical pointed spring and
guide both threads through the eyelets (68) on the thread coil (16).
• Now place the coil cover (65) on the new thread coil. Turn it so that
the recesses in the coil cover (65) align with the eyelets (68) of the
thread coil (16).
• Now press the thread cover (65) together with the thread holder (67)
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:
• Dismantle the thread coil (16) from the brush cutter / grass trimmer
(12).
• Pull the coil cover (65) off the thread coil (16) by firmly pressing the
retaining lugs (66) (Fig. 23).
• Remove the thread holder (67) with the thread remnants.
• Remove the thread remnants from the thread holder (67).
• Take a new thread in the middle and hook it to the retaining lug (c) of
the thread holder (67) (Fig. 25)
• Wrap the new thread on the thread holder (67) as shown in Fig. 26.
The end of the thread must protrude approx. 10 cm.
• Now place the thread holder (67) on the conical pointed spring and
guide both threads through the eyelets (68) on the thread coil (16).
• Now place the coil cover (65) on the thread coil (16). Turn it so that
the recesses in the coil cover (65) align with the eyelets (68) of the
thread coil (16).
• Now press the thread cover (65) together with the thread holder (67)
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.
14.3.2 Grinding the cutting blade (14a) (Fig. 7)
The cutting blade (14a) can become blunt over time.
• If you notice this, loosen the screws securing the cutting blade (14a)
to the shield (14).
• Then fasten the cutting blade (14a) in a vice.
• Grind the cutting edge of the cutting blade (14a) using a flat file and
make sure to maintain the angle of the cutting edge.
• Important! Replace the cutting blade (14a) in the shield (14).
Replace or sharpen the cutting blade (14a) at the end of each mowing
season or as needed.
14.3.3 Grinding the cutting blade (15)
If the blades become slightly dull, you can sharpen them yourself.
• Fasten the cutting blade (15) in a vice.
• Grind all 3 blades of the cutting blade (15) using a flat file and make
sure to maintain the angle of the cutting edge. (~25°) Only file in one
direction.
• The cutting blade (15) must be replaced after sharpening them five
times at the latest.
Replace the cutting blade (15) if the cutting edge is heavily worn or
broken.
The trimmer may vibrate strongly if the cutting blade (15) is not bal-
anced. Thus there is a danger of injury!
14.3.4 Lubricating the brushcutter / grass trimmer (12)
(Fig. 27)
Treat with lithium-based grease. Remove the screw (69) and put in the
grease, turn the shaft manually until the grease comes out
Then refit the screw (69).
Attention! Top up with only a little grease. Under no circumstances over-
fill.
GB/IE/NI
19
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