English

Core bit

Thread

Core bit shank

Fig. 17

(2) Mount the core bit to the rotary hammer (Fig. 18).

Fig. 18

(3)Insert the center pin into the guide plate until it stops.

(4)Engage the guide plate with the core bit, and turn the guide plate to the left or the right so that it does not fall even if it faced downward. (Fig. 19).

Guide plate

Center pin

Core bit tip

Core bit

Fig. 19

2. How to bore (Fig. 20)

(1)Connect the plug to the power source.

(2)A spring is installed in the center pin.

Push it lightly to the wall or the floor straight. Connect the core bit tip flush to the surface and start operating.

(3)When boring about 5 mm in depth the position of the hole will be established. Bore after that removing the center pin and the guide plate from core bit.

(4)Application of excessive force will not only expedite the work, but will deteriorate the tip edge of the drill bit, resulting in reduced service life of the rotary hammer.

CAUTION

When removing the center pin and the guide plate, turn OFF the switch and disconnect the plug from the receptacle.

Fig. 20

3.Dismounting (Fig. 21)

Remove the core bit shank from the rotary hammer and strike the head of the core bit shank strongly two or three times with a manual hammer holding the core bit, then the thread becomes loose and the core bit can be removed.

Core bit shank

Fig. 21

GREASE REPLACEMENT

This machine is full air-tight construction to protect against dust incursion and to prevent lubricant leakage. This machine can be used without grease replenishment for an extended period of time. However, perform the grease replacement to extend the service life. Replace the grease as described below.

1.Grease Replacement Period

You should look at the grease when you change the carbon brush. (See item 4 in the section

MAINTENANCE AND INSPECTION.)

Ask for grease replacement at the nearest authorized Hitachi Service Center.

In the case that you are forced to change the grease by yourself, please follow the following points.

2.How to replace grease

CAUTION:

Before replacing the grease, turn the power off and pull out the plug from the receptacle.

(1)Disassemble the crank cover and thoroughly wipe off the old grease inside. (Fig. 22)

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