Makita DUC121 Manual De Instrucciones página 19

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. 7)
While turning the guide bar counterclockwise, install it so
that the end of guide bar contacts the spring. (Fig. 8)
Insert the hook of sprocket cover into the hole in the tool
and then place the sprocket cover on the tool. (Fig. 9)
Turn the knob clockwise to tighten the screw firmly.
(Fig. 10)
Adjusting saw chain tension (Fig. 11 & 12)
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. 13)
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. 14)
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 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
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. (Fig. 15 & 16)
When cutting thick branches, first make a shallow under-
cut and then make the finish cut from the top. (Fig. 17)
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. 18)
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. 19)
Carrying tool (Fig. 20)
Always remove the battery cartridge from the tool and
overlap the guide bar with the scabbard before carrying
the tool. Also cover the battery cartridge with the battery
cover.
MAINTENANCE
CAUTION:
• Always be sure that the tool is switched off and the bat-
tery cartridge is removed before attempting to perform
inspection or maintenance.
• Always wear gloves when performing any inspection or
maintenance.
• Never use gasoline, benzine, thinner, alcohol or the
like. Discoloration, deformation or cracks may result.
Sharpening the saw chain
CAUTION:
• Always remove the battery cartridge and wear safety
gloves when performing work on the saw chain.
Sharpen the saw chain when:
– Mealy sawdust is produced when damp wood is cut;
– The chain penetrates the wood with difficulty, even
when heavy pressure is applied;
– The cutting edge is obviously damaged;
– The saw pulls to the left or right in the wood. The rea-
son for this behaviour is uneven sharpening of the saw
chain, or damage to one side only. (Fig. 21)
Sharpen the saw chain frequently, but remove only a
little material each time.
Two or three strokes with a file are usually sufficient for
routine resharpening. When the saw chain has been
resharpened several times, have it sharpened in a
MAKITA specialist repair shop.
File and file guiding (Fig. 22)
– Use a special round file (optional accessory) for saw
chains, with a diameter of 4 mm, to sharpen the chain.
Normal round files are not suitable.
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