Adjusting Saw Chain Tension; Operation - Makita DUC256 Instruction Manual

4. Insert the protrusion and the pin on the sprocket
cover to the chain saw body, and then close the cover
so that the bolt and pin on the chain saw body meet
their counterparts on the cover.
► Fig.12: 1. Protrusion 2. Sprocket cover 3. Bolt
4. Pin
5. Tighten the retaining nut to secure the sprocket
cover, then loosen it a bit for tension adjustment.
(See the chapter on "Adjusting saw chain tension" for
procedure.)
► Fig.13: 1. Retaining nut
To remove the saw chain, perform the following steps:
1. Release the chain brake by pulling the front hand
guard.
2. Loosen the chain adjusting screw, then the retain-
ing nut.
► Fig.14: 1. Chain adjusting screw 2. Retaining nut
3.
Remove the sprocket cover then remove the saw
chain and guide bar from the chain saw body.

Adjusting saw chain tension

CAUTION:
Do not tighten the saw chain too
much. Excessively high tension of saw chain may
cause breakage of saw chain and wear of the guide
bar.
CAUTION:
A chain which is too loose can
jump off the bar and it may cause an injury
accident.
The saw chain may become loose after many hours
of use. From time to time check the saw chain tension
before use.
1.
Release the chain brake by pulling the front hand
guard.
2. Loosen the retaining nut a bit to loosen the
sprocket cover lightly.
► Fig.15: 1. Retaining nut
3. Lift up the guide bar tip slightly and adjust the
chain tension. Turn the chain adjusting screw clockwise
to tighten, turn it counterclockwise to loosen.
For chain blade 90PX, 91PX and 80TXL:
Tighten the saw chain until the lower side of the saw
chain fits in the guide bar rail as illustrated.
► Fig.16: 1. Guide bar 2. Saw chain 3. Chain adjust-
ing screw
For chain blade 25AP:
Tighten the saw chain so that the gap between the cen-
ter of the lower side of the guide bar and the saw chain
becomes approximately 1 mm to 2 mm.
4. Keep holding the guide bar lightly and tighten the
sprocket cover.
For chain blade 90PX, 91PX and 80TXL:
Make sure that the saw chain does not loose at the
lower side.
For chain blade 25AP:
Make sure that the gap between the center of the lower
side of the guide bar and the saw chain is approximately
1 mm to 2 mm.
5. Tighten the retaining nut to secure the sprocket
cover.
► Fig.17: 1. Retaining nut

OPERATION

Lubrication
Saw chain is automatically lubricated when the tool is in
operation. Check the amount of remaining oil in the oil
tank periodically through the oil inspection window.
To refill the tank, lay the chain saw on its side, then
push the oil tank cap, and then remove the oil tank
cap. The proper amount of oil is 200 ml. After refilling
the tank, make sure that the oil tank cap is tightened
securely.
► Fig.18: 1. Oil tank cap 2. Oil inspection window
After refilling, hold the chain saw away from the
tree. Start it and wait until lubrication on saw chain is
adequate.
► Fig.19
NOTICE:
When filling the chain oil for the first
time, or refilling the tank after it has been com-
pletely emptied, add oil up to the bottom edge of
the filler neck. The oil delivery may otherwise be
impaired.
NOTICE:
Use the saw chain oil exclusively for
Makita chain saws or equivalent oil available in
the market.
NOTICE:
Never use oil including dust and parti-
cles or volatile oil.
NOTICE:
When pruning trees, use botanical oil.
Mineral oil may harm trees.
NOTICE:
Before the cutting operation, make sure
that the provided oil tank cap is screwed in place.
WORKING WITH THE CHAIN SAW
CAUTION:
The first time user should, as a
minimum practice, do cutting logs on a saw-horse
or cradle.
CAUTION:
When sawing precut timber, use a
safe support (saw horse or cradle). Do not steady
the workpiece with your foot, and do not allow
anyone else to hold or steady it.
CAUTION:
Secure round pieces against
rotation.
CAUTION:
Keep all parts of the body away
from the saw chain when the motor is operating.
CAUTION:
Hold the chain saw firmly with
both hands when the motor is running.
CAUTION:
Do not overreach. Keep proper
footing and balance at all times.
NOTICE:
Never toss or drop the tool.
NOTICE:
Do not cover the vents of the tool.
18 ENGLISH