27
Wind the thread tautly on the thread spool roll by
rotating the roll clockwise.
Clamp both threads into the slots to prevent the
thread from unwinding while inserting the thread spool roll.
Sharpening or replacing the thread knife
Â
Unscrew the thread knife (29).
Â
Clamp the thread knife into a vice and sharpen it with a flat
file.
Make sure not to change the angle of the knife and file only
in one direction.
File carefully.
Â
Screw down the thread knife again as shown.
Do not overtighten the screws.
L
Do not use unsharpened or damaged thread knives. A
damaged thread knife must be replaced by a new one.
Cutting blade
Safe and efficient working is only possible with a
correctly sharpened and intact cutting blade.
Therefore, check the cutting blade for dull edges, bents, cracks
or other damages on a regular basis.
Have dull cutting blades sharpened by a specialist/service
workshop.
Both sides of the cutting blade may be used. Turn round
the cutting blade once and continue to work with the brush
cutter until both sides of the cutting blade are dull-edged.
Replace damaged cutting blade by new one.
Cleaning the air filter
Clean the air filter from dust and dirt on a regular basis to
prevent
−
starting problems,
−
loss of output,
−
excessive fuel consumption.
Clean the air filter every 8 operating hours, or more frequently
in dusty environments (every 10 hours).
Â
Put the choke lever (24) to the position
OFF
to prevent
dirt from entering the carburettor
Â
Loosen the screw with the Allen key (12) and remove the
air filter cover (18).
Â
Remove the air filter cover
(38).
Â
Remove the air filter (39).
Â
Wash the air filter in a lukewarm soapy solution.
Do not puff/blow out dirt particles; otherwise there is a
risk of eye injury.
Â
Allow the air filter to dry well and reinsert it.
L
Damaged air filters must be replaced without delay.
Checking / replacing the fuel filter
Â
Check the fuel filter (40) if required. A contaminated fuel filter
restricts the fuel supply.
Open the tank cap (23) and pull the fuel filter (40) through the
opening using a wire hook.
⇒
Slight contamination:
Pull the fuel filter from the fuel line and clean it in petroleum
ether.
⇒
Bad contamination:
Replace the fuel filter.
Checking / replacing the spark plug
-
Do not touch the spark plug or the spark plug
connector while the engine is running.
High voltage!
-
Risk of burning on the hot engine.
-
Wear protective gloves.
Check the spark plug and the spark gap on a regular basis.
For this proceed as follows:
Allow the engine to cool down.
Â
Pull the spark plug connector (19) from the spark plug
(41).
Â
Remove the spark plug using the supplied spark plug wrench
(14).
Â
The spark gap must be 0.6 to 0.7 mm.
Â
Clean the spark plug when it is contaminated.
Â
Install the spark plug in reverse order.
Do not overtighten the spark plug.
L
A loose spark plug may overheat and damage the
engine.
L
Tightening the spark plug too firmly may damage the
thread in the cylinder head.
Replace the spark plug:
−
every 100 hours or once in a year (whichever case comes
first)
−
when the insulating body is damaged,
−
when the electrodes show excessive erosion,
−
when the electrodes show excessive dirt or oil.
Use the following spark plug type:
BOSCH L8RTF
Checking the ignition spark
Â
Remove the spark plug.
Firmly connect the spark plug connector (24).
Â
Use an insulated pair of tongs to press the spark plug against
the engine body (away from the spark plug hole).
Â
Put the ON/OFF switch (33) to the position
.
Pull the cranking rope.
L
If there is no spark visible between the electrodes, the
spark plug may be defective.
Summary of Contents for BF 43-2
Page 2: ......
