Operation; Working With The Chain Saw - Makita BUC250 Betriebsanleitung

2. Press the lever and with the lever pressed in, turn it
counterclockwise to loosen the nut until sprocket
cover comes off. (Pressing in the lever leads to the
fitting of lever into the nut.) (Fig. 7)
3. Turn the adjusting dial counterclockwise to release
the saw chain tension.
4. Remove the sprocket cover.
5. Remove the saw chain and guide bar from the chain
saw.
6. To install the saw chain, fit in one end of the saw
chain on the top of the guide bar and the other end
of it around the sprocket. (Fig. 8)
At this time, fit the saw chain as shown in the figure
because it rotates in the direction of arrow.
7. Rest the guide bar in place on the chain saw.
8. Turn the adjusting dial counterclockwise to slide the
adjusting pin in the direction of arrow. (Fig. 9)
9. Place the sprocket cover on the chain saw so that
the adjusting pin is positioned in a small hole in the
guide bar. (Fig. 10)
10. Press in the lever and with the lever depressed turn
it fully clockwise to tighten the nut. Then make it
about a quarter turn counterclockwise to loosen the
nut lightly. (Fig. 11)
Adjusting saw chain tension
The saw chain may become loose after many hours of
use. From time to time check the saw chain tension
before use. (Fig. 12)
Move the lever in the upright position.
Press in the lever. With the lever depressed, make a
quarter turn on it counterclockwise to loosen the nut
lightly. (Pressing in the lever leads to the fitting of lever
into the nut.) (Fig. 13)
Turn the adjusting dial to adjust saw chain tension. Grasp
the saw chain in the middle of the guide bar and lift up.
The gap between the guide bar and the tie strap of the
saw chain should be approx. 2 – 4 mm. If the gap is not
approx. 2 – 4 mm, slightly turn the adjusting dial which
secures the guide bar. At this time, adjust with the tip of
guide bar slightly pointing up. (Fig. 14)
With the lever depressed, turn it fully clockwise to tighten
the nut firmly. (Fig. 15)
Return the lever to its original position. (Fig. 16)
CAUTION:
• Excessively high tension of saw chain may cause
breakage of saw chain, wear of the guide bar and
breakage of the adjusting dial.
• Installing or removing saw chain should be carried out
in a clean place free from sawdust and the like.

OPERATION

Lubrication (Fig. 17)
Saw chain is automatically lubricated when the tool is in
operation.
Check the amount of remaining oil in the oil tank through
the oil inspection window.
To refill the tank, remove the cap from the oil tank open-
ing. The oil tank capacity is 80 ml.
After refilling the tank, always screw the provided oil tank
cap on the chain saw.
18
CAUTION:
• When filling the chain saw with chain oil for the first
time, or refilling the tank after it has been completely
emptied, add oil up to the bottom edge of the filler neck.
The oil delivery may otherwise be impaired.
• As a saw chain oil, use oil exclusively for Makita chain
saws or oil available in market.
• Never use oil including dust and particles or volatile oil.
• When pruning trees, use botanical oil. Mineral oil may
harm trees.
• Never force the chain saw when pruning trees.
• Before cutting out, make sure that the provided oil tank
cap is screwed in place.
Hold the chain saw away from the tree. Start it and wait
until lubrication on saw chain is adequate.
Bring the lower guide into contact with the branch to be
cut before switching on. Cutting without bringing the
lower guide into contact with the branch may cause the
guide bar to wobble, resulting in injury to operator.
Saw the wood to be cut by just moving it down. (Fig. 18)

WORKING WITH THE CHAIN SAW

The first time user should, as a minimum practice, do cut-
ting logs on a saw-horse or cradle.
Pruning trees
CAUTION:
• Keep all parts of the body away from the saw chain
when the motor is operating.
• Hold the chain saw firmly with both hands when the
motor is running.
• Do not overreach. Keep proper footing and balance at
all times.
Bring the lower guide into contact with the branch to be
cut before switching on. Cutting without bringing the
lower guide into contact with the branch may cause the
guide bar to wobble, resulting in injury to operator.
(Fig. 19)
When cutting thick branches, first make a shallow under-
cut and then make the finish cut from the top. (Fig. 20)
If you try to cut off thick branches from the bottom, the
branch may close in and pinch the saw chain in the cut. If
you try to cut off thick branches from the top without a
shallow undercut, the branch may splinter. (Fig. 21)
If you cannot cut the timber right through with a single
stroke:
Apply light pressure to the handle and continue sawing
and draw the chain saw back a little; then apply the spike
a little lower and finish the cut by raising the handle.
(Fig. 22)
Bucking
For bucking cuts, rest the serrated rail shown in the figure
on the wood to be cut. (Fig. 23)
With the saw chain running, saw into the wood, using the
top handle to raise the saw and the front one to guide it.
Use the serrated rail as a pivot.
Continue the cut by applying slight pressure to the front
handle, easing the saw back slightly. Move the serrated
rail further down the timber and raise the front handle
again.
When making several cuts, switch the chain saw off
between cuts.