English
14
Wear limit
No. of carbon brush
0.20" (5 mm)
0.47" (12 mm)
21
MAINTENANCE AND INSPECTION
WARNING:
Be sure to switch power OFF and disconnect the plug from the
receptacle during maintenance and inspection.
1. Checking punch and die
A worn or defective punch and die will greatly decrease work efficiency.
Check and replace them periodically. Refer to “HOW TO REPLACE THE PUNCH AND
DIE”.
2. Inspecting the screws
Regularly inspect all screws and ensure that they are properly tightened. Should any of
the screws be loose, retighten them immediately.
WARNING:
Using this Nibbler with loosen screws is extremely dangerous.
3. Maintenance of the motor
The motor unit winding is the very “heart” of the power tool. Exercise due care to
ensure the winding does not become damaged and/or wet with oil or water.
4. Inspecting the carbon brushes (Fig. 10)
The motor employs carbon brushes which are consumable parts. When they become
worn to or near “wear limit”, it could result in motor trouble. When an auto-stop carbon
brush is equipped, the motor will stop automatically. At that time, replace both carbon
brushes with new ones which have the same carbon brush Nos. shown in the figure.
In addition, always keep carbon brushes clean and ensure that they slide freely within
the brush holders.
CAUTION:
Using this Nibbler with a carbon brush which is worn in excess of the wear limit will
damage the motor.
Fig. 10
NOTE:
Use HITACHI carbon brush No. 21 indicated in Fig. 10.
