Operation; Working With The Chain Saw - Makita BUC250 Betriebsanleitung

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. 13)
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. 14)
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. 15)
With the lever depressed, turn it fully clockwise to tighten
the nut firmly. (Fig. 16)
Return the lever to its original position. (Fig. 17)
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.
Battery adapter (Accessory) (Fig. 18 & 19)
CAUTION:
• Before using battery adapter, read all instructions on
tools using battery.
• When charging a battery cartridge, first remove it from
the battery adapter and then charge it. It is not allowed
to charge the battery cartridge while using battery
adapter.
Installing or removing battery adapter
• Always switch off the tool before insertion or removal of
the battery adapter.
• To remove the battery adapter, slide it from the tool
while sliding the button on the adapter.
• To install the battery adapter, align the tongue on the
battery adapter with the groove in the housing and slip
it into place. Insert it all the way until it locks in place
with a little click. If you can see the red indicator on the
upper side of the button, it is not locked completely.
CAUTION:
• Always install the battery adapter fully until the red indi-
cator cannot be seen. If not, it may accidentally fall out
of the tool, causing injury to you or someone around
you.
• Do not install the battery adapter forcibly. If the adapter
does not slide in easily, it is not being inserted correctly.
• The way of removing or installing a battery cartridge
from or on the battery adapter is the same as that of
removing or installing it from or on the tools.
• Press down the hook securely as far as it will go when
the battery adapter is hooked on the waist belt and sim-
ilar objects.
Arm cord hook (Accessory) (Fig. 20)
CAUTION:
• Do not attach the holder of arm cord hook to other than
the extension cord. Failure to do so may cause an acci-
dent or personal injury.
Using the arm cord hook helps to minimize a risk of cut-
ting off the extension cord unexpectedly caused by the
loose extension cord.
Attach firmly the arm cord hook band placing around
your arm and pass the extension cord through the holder.
The length of the arm cord hook band is adjustable.
NOTE:
• Do not pass the extension cord through the band.
• Do not force the opening of the holder. Failure to do so
may cause deflection and damage to it.
Spike bumper (optional accessory) (Fig. 21)
To install spike bumper, perform the following steps:
1. Remove the sprocket cover, saw chain and guide
bar as described in this instruction manual.
2. Fit the holes of spike bumper along with the holes on
the chainsaw.
3. Tighten them firmly with screws.

OPERATION

Lubrication (Fig. 22)
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.
After refilling the tank, always screw the provided oil tank
cap on the chain saw.
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. 23)

WORKING WITH THE CHAIN SAW

The first time user should, as a minimum practice, do cut-
ting logs on a saw-horse or cradle.
21