8
FUNCTIONAL DESCRIPTION
CAUTION:
• Always be sure that the tool is switched off and
unplugged before adjusting or checking function on the
tool.
Shaft lock (Fig. 1)
CAUTION:
• Never actuate the shaft lock when the spindle is moving.
The tool may be damaged.
Press the shaft lock to prevent spindle rotation when install-
ing or removing accessories.
Switch action (Fig. 2)
CAUTION:
• Before plugging in the tool, always check to see that the
slide switch actuates properly and returns to the “OFF”
position when the rear of the slide switch is depressed.
• Switch can be locked in “ON” position for ease of operator
comfort during extended use. Apply caution when locking
tool in “ON” position and maintain firm grasp on tool.
For model GA4040C, GA4041C, GA4540C, GA4541C,
GA5040C, GA5041C, GA6040C
To start the tool, slide the slide switch toward the “I (ON)”
position by pushing the rear of the slide switch. For con-
tinuous operation, press the front of the slide switch to
lock it.
To stop the tool, press the rear of the slide switch, then slide
it toward the “O (OFF)” position.
For model GA5040CN
To start the tool, slide the slide switch toward the “I (ON)”
position.
To stop the tool, release the slide switch toward the
“O (OFF)” position.
Indication lamp (Fig. 3)
The indication lamp lights up green when the tool is
plugged. If the indication lamp does not light up, the mains
cord or the controller may be defective. The indication lamp
is lit but the tool does not start even if the tool is switched
on, the carbon brushes may be worn out, or the controller,
the motor or the ON/OFF switch may be defective.
Unintentional restart proof
The tool does not start with the switch being lock-on even
when the tool is plugged.
At this time, the indication lamp flickers red and shows the
unintentional restart proof device is on function.
To cancel the unintentional restart proof, return the slide
switch to “O (OFF)” position.
Speed adjusting dial (Fig. 4)
The rotating speed can be changed by turning the speed
adjusting dial to a given number setting from 1 to 5.
Higher speed is obtained when the dial is turned in the
direction of number 5. And lower speed is obtained when it
is turned in the direction of number 1.
Refer to the below table for the relationship between the
number settings on the dial and the approximate rotating
speed.
For model GA4040C, GA4540C, GA5040C,
GA5040CN, GA4041C, GA4541C, GA5041C
012752
For model GA6040C
012756
CAUTION:
• If the tool is operated continuously at low speeds for a
long time, the motor will get overloaded and heated up.
• The speed adjusting dial can be turned only as far as 5
and back to 1. Do not force it past 5 or 1, or the speed
adjusting function may no longer work.
Electronic function
The tools equipped with electronic function are easy to
operate because of the following features.
Constant speed control
Constant speed control provides fine finish by keeping
the rotating speed constant under the loaded condition.
Soft start feature
Soft start feature suppresses starting shock.
Overload protector
When the load on the tool exceeds admissible levels,
power to the motor is reduced to protect the motor from
overheating. When the load returns to admissible levels,
the tool will operate as normal.
Mechanical brake
For model GA4041C, GA4541C, GA5041C
Mechanical brake is activated after the tool is switched
off.
The brake does not work when the power supply is shut
down with the switch still on.
ASSEMBLY
CAUTION:
• Always be sure that the tool is switched off and
unplugged before carrying out any work on the tool.
Installing side grip (handle) (Fig. 5)
CAUTION:
• Always be sure that the side grip is installed securely
before operation.
Screw the side grip securely on the position of the tool as
shown in the figure.
Number
min
–1
(R.P.M.)
1
2,800
2
4,000
3
6,000
4
8,000
5
11,000
Number
min
–1
(R.P.M.)
1
4,000
2
5,000
3
6,000
4
7,000
5
9,000
Number
min
–1
(R.P.M.)
