6 
FUNCTIONAL DESCRIPTION 
 
CAUTION: 
• Always be sure that the tool is switched off and the 
battery cartridge is removed before adjusting or 
checking function on the tool. 
Installing or removing battery cartridge 
Fig.1 
CAUTION: 
• Always switch off the tool before installing or 
removing of the battery cartridge. 
• Hold the tool and the battery cartridge firmly 
when installing or removing battery cartridge. 
Failure to hold the tool and the battery cartridge 
firmly may cause them to slip off your hands and 
result in damage to the tool and battery cartridge 
and a personal injury. 
To remove the battery cartridge, slide it from the tool 
while sliding the button on the front of the cartridge. 
To install the battery cartridge, align the tongue on the 
battery cartridge with the groove in the housing and slip it 
into place. Insert it all the way until it locks in place with a 
little click. If you can see the red indicator on the upper 
side of the button, it is not locked completely. 
 
CAUTION: 
• Always install the battery cartridge fully until the red 
indicator cannot be seen. If not, it may accidentally 
fall out of the tool, causing injury to you or someone 
around you. 
• 
Do not install the battery cartridge forcibly. If the cartridge 
does not slide in easily, it is not being inserted correctly. 
Battery protection system 
(Lithium-ion battery with star marking) 
Fig.2 
Lithium-ion batteries with a star marking are equipped 
with a protection system. This system automatically cuts 
off power to the tool to extend battery life. 
The tool will automatically stop during operation if the tool 
and/or battery are placed under one of the following 
conditions: 
• Overloaded: 
The tool is operated in a manner that causes 
it to draw an abnormally high current. 
In this situation, release the switch trigger on 
the tool and stop the application that caused 
the tool to become overloaded. Then pull the 
switch trigger again to restart. 
If the tool does not start, the battery is 
overheated. In this situation, let the battery 
cool before pulling the switch trigger again. 
• Low battery voltage: 
The remaining battery capacity is too low and 
the tool will not operate. In this situation, 
remove and recharge the battery. 
Switch action 
Fig.3 
CAUTION: 
• Before inserting the battery cartridge into the tool, 
always check to see that the switch trigger actuates 
properly and returns to the "OFF" position when 
released. 
To start the tool, simply pull the switch trigger. Tool speed 
is increased by increasing pressure on the switch trigger. 
Release the switch trigger to stop. 
Lighting up the front lamp 
Fig.4 
CAUTION: 
• Do not look in the light or see the source of light 
directly. 
Pull the switch trigger to light up the lamp. The lamp 
keeps on lighting while the switch trigger is being pulled. 
The lamp goes out 10 -15 seconds after releasing the 
trigger. 
 
NOTE: 
• Use a dry cloth to wipe the dirt off the lens of lamp. 
Be careful not to scratch the lens of lamp, or it may 
lower the illumination. 
Reversing switch action 
Fig.5 
CAUTION: 
• Always check the direction of rotation before 
operation. 
• Use the reversing switch only after the tool comes 
to a complete stop. Changing the direction of 
rotation before the tool stops may damage the tool. 
• When not operating the tool, always set the 
reversing switch lever to the neutral position. 
This tool has a reversing switch to change the direction of 
rotation. Depress the reversing switch lever from the A 
side for clockwise rotation or from the B side for 
counterclockwise rotation. 
When the reversing switch lever is in the neutral position, 
the switch trigger cannot be pulled. 
Speed change 
Fig.6 
CAUTION: 
• 
Always set the speed change lever fully to the 
correct position. If you operate the tool with the 
speed change lever positioned halfway between the 
"1" side and "2" side, the tool may be damaged. 
• Do not use the speed change lever while the tool is 
running. The tool may be damaged. 
To change the speed, first switch off the tool and then 
slide the speed change lever to the "2" side for high 
speed or "1" side for low speed. Be sure that the speed 
change lever is set to the correct position before 
operation. Use the right speed for your job.