Makita DUC252 Manuel D'instructions page 16

To install the saw chain, perform the following steps:
1. Make sure the direction of the chain. The arrow
mark on the chain shows the direction of the chain.
2. Fit in one end of the saw chain on the top of the
guide bar and the other end of it around the
sprocket.
3. Rest the guide bar in place on the chain saw.
4. Turn the adjusting dial to "–" direction to slide the
adjusting pin in the direction of arrow.
5. Place the sprocket cover on the chain saw so that
the adjusting pin is positioned in a small hole in the
guide bar.
6. Turn the lever clockwise fully and a quarter turn back
to keep looseness for adjusting chain tension.
7. Turn the adjusting dial, and adjust the chain tension.
(See the chapter on "Adjusting saw chain tension"
for procedure.)
8. Turn the lever clockwise to secure the sprocket
cover.
9. Press and return the lever to its original position.
To remove the saw chain, perform the following steps:
1. Press and fully open the lever until it stops.
2. Turn the adjusting dial to "–" direction to release the
saw chain tension.
3. Turn the lever counterclockwise to loosen the
sprocket cover until it comes off.
4. Remove the sprocket cover.
5. Remove the saw chain and guide bar from the chain
saw.
Adjusting saw chain tension (Fig. 12, 14 & 11)
The saw chain may become loose after many hours of
use. From time to time check the saw chain tension
before use.
1. Press and fully open the lever until it clicks. Turn it
counterclockwise a little to loosen sprocket cover
lightly.
2. Lift up the guide bar tip slightly.
3. Turn the adjusting dial to adjust the saw chain
tension. Tighten the saw chain until the lower side of
the saw chain fits in the guide bar rail (see circle in
the figure).
4. Keep holding the guide bar lightly and tighten the
sprocket cover after adjusting the chain tension.
Make sure that the saw chain does not loose at
lower side.
5. Press and return the lever to its original position.
Make sure the saw chain fits snugly against the lower
side of the bar.
CAUTION:
• Do not tighten the saw chain too much. Excessively
high tension of saw chain may cause breakage of saw
chain, wear of the guide bar and breakage of the
adjusting dial.
• A chain which is too loose can jump off the bar, and
therefore presents an accident risk.
• Carry out the procedure of installing or removing saw
chain in a clean place free from sawdust and the like.
Spiked bumper (optional accessory) (Fig. 15)
To install spike bumper, perform the following steps:
1. Remove the sprocket cover, saw chain and guide
bar as described in this instruction manual.
16
2. Fit the holes of spike bumper along with the holes on
the chainsaw.
3. Tighten them firmly with screws.
OPERATION
CAUTION:
• Do not cover vents, or it may cause overheating and
damage to the tool.
Lubrication (Fig. 16 & 17)
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 spike bumper into contact with the branch to be
cut before switching on. Otherwise it may cause the
guide bar to wobble, resulting in injury to operator.
Saw the wood to be cut by just moving it down.
WORKING WITH THE CHAIN SAW
Pruning trees (Fig. 18, 19, 20 & 21)
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 spike bumper into contact with the branch to be
cut before switching on. Cutting without bringing the
spike bumper 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.
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.
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.