28
7-3. Cleaning the guide bar
CAUTION: Protective gloves must be worn.
(Fig. 66)
Regularly inspect the bearing surfaces of the guide bar (7) for
damage, and clean them with a suitable tool.
Keep the two oiling holes (6) and the entire guide bar clean
and free of foreign matter!
7-4. Replacing the saw chain
CAUTION: Use only chains and guide bars designed for
this saw!
(Fig. 67)
Check the sprocket before mounting a new chain.
Worn out sprockets (8) may damage the new chain and must
therefore be replaced.
Remove the sprocket guard (see 6 “PUTTING INTO
OPERATION”).
Remove the chain and guide bar.
Remove circlip (9).
CAUTION: The circlip will pop out of the groove. When
removing it, hold your thumb against it to prevent it from
popping off.
Remove shim washer (11).
If the sprocket (8) is worn out, the complete clutch drum (12)
will need to be replaced.
Install a complete new clutch drum (12), shim washer (11) and
new circlip (9).
For replacing the guide bar, chain, and sprocket see 6
“PUTTING INTO OPERATION”.
NOTE:
Don’t use a new chain on a worn chain sprocket. By the
time 2 chains have worn, the sprocket has become worn
out, so it should be replaced at least at every second chain
replacement. To distribute the chain oil evenly, run a new chain
at half‑throttle for a few minutes before use.
New chains stretch, so check the chain tension frequently (see
6‑3 “Checking the chain tension”).
7-5. Cleaning the air filter
CAUTION: To prevent eye injury, always wear eye
protection when cleaning the filter with compressed air!
Do not use fuel to clean the air filter.
(Fig. 68)
Pull out the hood cap (1).
Loosen the scew (2) counter‑clockwise and remove the hood
(3).
Push up the combination switch (4) (Choke position) to prevent
dirt particles from falling into the carburetor.
Pull the air filter cover tab (5) slightly in the direction of the
arrow, and remove the air filter cover.
Remove the air filter (6).
IMPORTANT: Cover the intake opening with a clean cloth to
prevent dirt particles from getting into the carburetor.
If the filter is very dirty, clean it in lukewarm water with
dishwashing detergent.
Let the air filter dry completely.
If the filter is very dirty, clean it frequently (several times a day),
because only a clean air filter provides full engine power.
CAUTION:
Replace damaged air filters immediately.
Pieces of cloth or large dirt particles can destroy the
engine!
Insert the air filter (6) in the illustrated direction.
CAUTION:
Do not insert the air filter upside-down, even after
cleaning it. Otherwise dirt particles on the outside
surface of the air filter come into the carburetor and can
cause an engine trouble.
Put on the air filter cover.
Note: The air filter cover tab (5) will engage automatically if the
air filter cover is properly positioned.
Push down the combination switch (4) and press the throttle
(7) all the way down one time in order to deactivate the throttle
lock.
Put on the hood (3). When doing so make sure that the lower
pins (8) on both sides of the hood engage properly (when
correctly assembled, the pins should not be visible).
Tighten screw (2) clockwise.
Return the hood cap (1).
7-6. Replacing the spark plug
CAUTION:
Do not touch the spark plug or plug cap if the engine is
running (high voltage).
Switch off the engine before starting any maintenance
work. A hot engine can cause burns. Wear protective
gloves!
The spark plug must be replaced in case of damage to the
insulator, electrode erosion (burn) or if the electrodes are very
dirty or oily.
(Fig. 69)
Remove the filter cover (see 7‑11 “Cleaning the air filter”).
Pull the plug cap (9) off the spark plug. You can remove the plug
cap by hand.
Electrode gap
The electrode gap must be 0.6 mm.
CAUTION: Use only the following spark plugs:
NGK CMR6A.
7-7. Checking the ignition spark
(Fig. 70)
Press the loosened spark plug (10) with the ignition cable
firmly connected against the cylinder using insulated pliers
(not near the spark plug opening).
Put combination switch (11) in the “ON” position.
Pull the starter cable hard.
If the function is correct, an ignition spark must be visible near
the electrodes.
7-8. Checking the muffler screws
(Fig. 71)
Unscrew 3 screws (12) and remove the upper half of the
muffler (13).
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