Operation - Makita DUC121 Instruction Manual

Installing or removing saw chain
CAUTION:
• Always be sure that the tool is switched off and
the battery 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.
► Fig.6: 1. Sprocket cover 2. Knob
Loosen the screw by turning counterclockwise the knob
until the sprocket cover comes off.
Remove the sprocket cover.
Remove saw chain and guide bar from the tool.
► Fig.7: 1. Cutter 2. Guide bar 3. Arrow
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.8: 1. Spring 2. Sprocket
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.9: 1. Spring 2. Guide bar
While turning the guide bar counterclockwise, install it
so that the end of guide bar contacts the spring.
► Fig.10: 1. Sprocket cover 2. Hook 3. Hole
Insert the hook of sprocket cover into the hole in the tool
and then place the sprocket cover on the tool.
► Fig.11
Turn the knob clockwise to tighten the screw firmly.
Adjusting saw chain tension
► Fig.12
Just a slight loosening of the screw allows the saw chain ten-
sion to be adjusted. After adjusting, retighten the screw firmly.
► Fig.13
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.14
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. Place the spike bumper, with the spikes facing
upwards, so that its holes line up with the holes
provided on the chain saw.
3. Tighten the spike bumper with the two screws
provided.

OPERATION

Lubrication
► Fig.15: 1. Oil tank cap 2. Oil inspection window
3. Oil tank opening
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
opening.
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 tip guide/lower guide into contact with the
branch to be cut before switching on. Cutting without
bringing the tip guide/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.
Pruning trees
► Fig.16: 1. Tip guide
► Fig.17: 1. Lower guide
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 tip guide/lower guide into contact with the
branch to be cut before switching on. Cutting without
bringing the tip guide/lower guide into contact with the
branch may cause the guide bar to wobble, resulting in
injury to operator.
When cutting thick branches, first make a shallow
undercut and then make the finish cut from the top.
► Fig.18
13 ENGLISH