Adjusting Saw Chain Tension; Operation - Makita UC4041A Instruction Manual

follow the safety rules stated in this instruction
manual may cause serious personal injury.
DESIGNATION OF PARTS (Fig. 5)
ASSEMBLY
CAUTION:
• Always be sure that the tool is switched off and
unplugged before carrying out any work on the tool.
Removing or installing saw chain
CAUTION:
• Always wear gloves when installing or removing the
saw chain.
To remove the saw chain, perform the following steps:
1. Press and fully open the lever until it stops. (Fig. 6)
2. Turn the lever counterclockwise to loosen the sprocket
cover until it comes off.
3. Turn the adjusting dial to "-" direction to release the
saw chain tension. (Fig. 7)
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. 8)
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. Align the tension slide with the hole of the guide bar.
(Fig. 9)
10. Holding the guide bar, and turn the adjusting dial to "+"
direction to adjust the saw chain tension.
11. Place the sprocket cover so that the hooks fit
alongside the holes and the pin fits its counterpart on
the sprocket cover. (Fig. 10)
12. Turn the lever clockwise to secure the sprocket cover.
(Fig. 11)
13. 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. 6)
2. Lift up the guide bar tip slightly. (Fig. 12)
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).
4. Keep holding the guide bar lightly, 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. 13)
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
12
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.
Engaging extension cord
CAUTION:
• Make sure that the extension cord is unplugged to the
mains outlet. (Fig. 14)
When engaging the extension cord, secure it to the chain
saw's cord with the cord hook.
Attach the cord hook about 100 - 200 mm from the
extension cord connector. This helps prevent
unintentional disconnection.

OPERATION

Switch action (Fig. 15)
CAUTION:
• Always be sure that the tool is switched off and
unplugged before checking function on the switch
trigger.
• Before plugging in the tool, always check to see that
the switch trigger actuates properly and returns to the
"OFF" position when released.
NOTE:
• Do not turn on and off too often within a short time (five
seconds or less). The temperature inside the tool will
rise and may cause the tool damage. The time varies
by atmosphere temperature and other conditions.
(Fig. 16)
To prevent the switch trigger from being accidentally
pulled, a lock-off button is provided.
To start the tool, depress the lock-off button and pull the
switch trigger. Release the switch trigger to stop.
Lubrication
CAUTION:
• Always be sure that the tool is switched off and
unplugged before lubricating the saw chain.
Lubricate the saw chain and bar using biologically
degradable saw chain oil with an adhesion agent. The
adhesion agent in the saw chain oil prevents the oil from
being thrown off the saw excessively quickly. Mineral oils
must not be used, as they are harmful to the environment.
(Fig. 17)
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.
• Never use waste oil. Waste oil contains 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.
• When filling the chain saw with chain oil for the first
time, or refilling the tank after it has been completely