Adjusting Saw Chain Tension; Operation - Makita DUC307 Instruction Manual

Installing the saw chain
To install the saw chain, perform the following steps:
1. Release the chain brake by pulling the front hand
guard.
2.
Pull the lever up while pressing its edge.
► Fig.7: 1. Lever
3. Turn the lever counterclockwise until the sprocket
cover comes off.
► Fig.8: 1. Lever 2. Sprocket cover
4. Remove the sprocket cover.
5. Check the direction of the saw chain. Match the
direction of the saw chain with that of the mark on the
chain saw body.
► Fig.9: 1. Mark on chain saw body
6. Fit one end of the saw chain on the top of the
guide bar.
7. Fit the other end of the saw chain around the
sprocket, then attach the guide bar to the chain saw
body.
► Fig.10: 1. Sprocket
8. Turn the adjusting dial to "-" direction to slide the
adjusting pin in the direction of arrow.
► Fig.11: 1. Adjusting dial 2. Adjusting pin
9. Place the sprocket cover on the chain saw so that
the adjusting pin is positioned in a small hole on the
guide bar.
► Fig.12: 1. Sprocket cover 2. Guide bar 3. Hole
10. Turn the lever clockwise fully and turn back the
lever a little to keep looseness for adjusting the chain
tension.
11. Adjust the chain tension. Refer to the section for
adjusting saw chain tension for procedure.
12. Turn the lever clockwise until the sprocket cover is
secured then return it to the original position.
► Fig.13: 1. Lever 2. Sprocket cover
Removing the saw chain
To remove the saw chain, perform the following steps:
1. Release the chain brake by pulling the front hand
guard.
2. Turn the adjusting dial to "-" direction to release
the saw chain tension.
► Fig.14: 1. Adjusting dial
3. Pull the lever up while pressing its edge.
► Fig.15: 1. Lever
4. Turn the lever counterclockwise until the sprocket
cover comes off.
► Fig.16: 1. Lever 2. Sprocket cover
5. Remove the sprocket cover then remove the saw
chain and guide bar from the chain saw body.

Adjusting saw chain tension

CAUTION:
Carry out the procedure of install-
ing or removing saw chain in a clean place free
from sawdust and the like.
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.
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.
Pull the lever up while pressing its edge.
► Fig.17: 1. Lever
2. Turn the lever counterclockwise a little to loosen
the sprocket cover lightly.
► Fig.18: 1. Lever 2. Sprocket cover
3. Lift up the guide bar tip slightly and adjust the
chain tension. Turn the adjusting dial to the "-" direction
to loosen, turn to the "+" direction to tighten. Tighten the
saw chain until the lower side of the saw chain fits in the
guide bar rail as illustrated.
► Fig.19: 1. Adjusting dial 2. Guide bar 3. Saw chain
4. Keep holding the guide bar lightly and tighten the
sprocket cover. Make sure that the saw chain does not
loose at the lower side.
5. Return the lever to the original position.
Make sure the saw chain fits snugly against the lower
side of the bar.

OPERATION

Lubrication
CAUTION:
Do not operate the chain saw when
the tank is empty. Replenish the oil in due time
before the tank is empty.
CAUTION:
Prevent the oil from coming into
contact with the skin and eyes. Contact with the
eyes causes irritation. In the event of eye contact,
flush the affected eye immediately with clear
water, then consult a doctor at once.
CAUTION:
Never use waste oil. Waste oil con-
tains carcinogenic substances. The contaminants
in waste oil cause accelerated wear of the oil
pump, the bar and the chain. Waste oil is harmful
to the environment.
17 ENGLISH