Adjusting The Chain Lubrication; Adjusting Saw Chain Tension - Makita DUC252 Instruction Manual

Adjusting the chain lubrication

Fig.6
You can adjust the oil pump feed rate with the adjusting
screw. The amount of oil can be adjusted using the
universal wrench.
Carabiner (rope attachment point)
Fig.7
Carabiner (Rope attachment point) is for use of tool
hanging. Before using carabiner, pull it out and tie it with
a rope.
ASSEMBLY
CAUTION:
Always be sure that the tool is switched off and the
•
battery cartridge is removed before carrying out
any work on the tool.
Removing or installing saw chain
CAUTION:
Always wear gloves when installing or removing
•
the saw chain.
The saw chain and the guide bar are still hot just
•
after the operation. Let them cool down enough
before carrying out any work on the tool.
To remove the saw chain, perform the following steps:
1. Press and fully open the lever until it stops.
Fig.8
2. Turn the adjusting dial to "-" direction to release
the saw chain tension.
Fig.9
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.
To install the saw chain, perform the following steps:
6. Make sure the direction of the chain. The arrow
mark on the chain shows the direction of the
chain.
Fig.10
7. Fit in one end of the saw chain on the top of the
guide bar and the other end of it around the
sprocket.
8. Rest the guide bar in place on the chain saw.
9. Turn the adjusting dial to "-" direction to slide the
adjusting pin in the direction of arrow.
Fig.11
10. Place the sprocket cover on the chain saw so that
the adjusting pin is positioned in a small hole in
the guide bar.
Fig.12
11. Turn the lever clockwise fully and a quarter turn
back to keep looseness for adjusting chain
tension.
12. Turn the adjusting dial, and adjust the chain
tension.
13. Turn the lever clockwise to secure the sprocket
cover.
Fig.13
14. Press and return the lever to its original position.

Adjusting saw chain tension

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.
Fig.14
2. Lift up the guide bar tip slightly.
Fig.15
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.
Fig.16
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.
Spike bumper (optional accessory)
Fig.17
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.
12