Makita BUC121 Manuel D'instructions page 18

FUNCTIONAL DESCRIPTION
CAUTION:
• Always be sure that the tool is switched off and the bat-
tery cartridge is removed before adjusting or checking
function on the tool.
Installing or removing battery cartridge (Fig. 1)
• Always switch off the tool before installing or removing
of the battery cartridge.
• Hold the tool and the battery cartridge firmly when
installing or removing battery cartridge.
Failure to hold the tool and the battery cartridge firmly
may cause them to slip off your hands and result in
damage to the tool and battery cartridge and a per-
sonal injury.
To remove the battery cartridge, slide it from the tool
while sliding the button on the front of the cartridge.
To install the battery cartridge, align the tongue on the
battery cartridge 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 cartridge fully until the red
indicator 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 cartridge forcibly. If the car-
tridge does not slide in easily, it is not being inserted
correctly.
Battery protection system (Lithium-ion battery
with star marking) (Fig. 2)
Lithium-ion batteries with a star marking are equipped
with a protection system. This system automatically cuts
off power to the tool to extend battery life.
The tool will automatically stop during operation if the
tool and/or battery are placed under one of the following
conditions:
• Overloaded:
The tool is operated in a manner that causes it to
draw an abnormally high current.
In this situation, release the trigger switch on the tool
and stop the application that caused the tool to
become overloaded. Then pull the trigger switch
again to restart.
If the tool does not start, the battery is overheated.
In this situation, let the battery cool before pulling the
trigger switch again.
• Low battery voltage:
The remaining battery capacity is too low and the
tool will not operate. In this situation, remove and
recharge the battery.
Switch action (Fig. 3)
CAUTION:
• Before inserting the battery cartridge into the tool,
always check to see that the switch trigger actuates
properly and returns to the "OFF" position when
released.
To prevent the switch trigger from being accidentally
pulled, a lock-off button is provided.
To start the tool, depress the lock-off button and pull the
switch trigger. Release the switch trigger to stop.
18
ASSEMBLY
CAUTION:
• Always be sure that the tool is switched off and the bat-
tery cartridge is removed before carrying out any work
on the tool.
Installing or removing saw chain
CAUTION:
• Always be sure that the tool is switched off and the bat-
tery cartridge is removed before installing or removing
the saw chain.
• Always wear gloves when installing or removing the
saw chain.
• Use only saw chain and guide bar with bar tip designed
for this chain saw (see the Extract from the spare parts
list).
• In order to prevent kickback, do not remove the bar tip
or replace the guide bar with one without a bar tip.
Loosen the screw by turning counterclockwise the knob
until the sprocket cover comes off. (Fig. 4)
Remove the sprocket cover.
Remove saw chain and guide bar from the tool.
Fit in one end of the saw chain on the top of guide bar. At
this time, fit the saw chain as shown in the figure
because it rotates in the direction of arrow. (Fig. 5)
Place the saw chain so that the spring is positioned
inside it and fit in the other end of saw chain around the
sprocket as shown in the figure. (Fig. 6)
While turning the guide bar counterclockwise, install it so
that the end of guide bar contacts the spring. (Fig. 7)
Insert the hook of sprocket cover into the hole in the tool
and then place the sprocket cover on the tool. (Fig. 8)
Turn the knob clockwise to tighten the screw firmly.
(Fig. 9)
Adjusting saw chain tension (Fig. 10 & 11)
Just a slight loosening of the screw allows the saw chain
tension to be adjusted. After adjusting, retighten the
screw firmly.
CAUTION:
• For a while after a new saw chain is installed, it tends to
become loosened. From time to time check the saw
chain tension before use.
• Low tension of saw chain may cause coming out of
place.
• Installing or removing saw chain should be carried out
in a clean place free from sawdust and the like.
Spike bumper (optional accessory) (Fig. 12)
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. 13)
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.