Makita UC3020A Instruction Manual page 12

FUNCTIONAL DESCRIPTION
CAUTION:
Always be sure that the tool is switched off and
•
unplugged before adjusting or checking function
on the tool.
Switch action
Fig.1
CAUTION:
Before plugging in the tool, always check to see
•
that the switch trigger actuates properly and
returns to the "OFF" position when released.
Fig.2
NOTE:
Do not turn on and off too often within a short time
•
(five seconds or less). The temperature inside the
tool will rise and may cause the tool damage. The
time varies by atmosphere temperature and other
conditions.
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.
ASSEMBLY
CAUTION:
Always be sure that the tool is switched off and
•
unplugged before carrying out any work on the
tool.
Installing or removing saw chain
CAUTION:
Always be sure that the tool is switched off and
•
unplugged before installing or removing the saw
chain.
Always wear gloves when installing or removing
•
the saw chain.
1. To remove the saw chain, move the lever in the
upright position.
Fig.3
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.)
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.4
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.5
9. Place the sprocket cover on the chain saw so that
the hook at its back cover is inserted into a hole
in the chain saw and the adjusting pin is
positioned in a small hole in the guide bar.
Fig.6
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.7
Adjusting saw chain tension
Fig.8
The saw chain may become loose after many hours of
use. From time to time check the saw chain tension
before use.
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.9
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.10
With the lever depressed, turn it fully clockwise to
tighten the nut firmly.
Fig.11
Return the lever to its original position.
Fig.12
CAUTION:
Excessively high tension of saw chain may cause
•
breakage of saw chain,
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.
12
wear of the guide bar