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8. How to use the drill bit (taper shank) and the taper shank adapter

(1)Mount the taper shank adapter to the rotary hammer. (Fig. 12)

(2)Mount the drill bit (taper shank) to the taper shank adapter. (Fig. 12)

(3)Turn the switch ON, and drill a hole in prescribed depth.

(4)To remove the drill bit (taper shank), insert the

cotter into the slot of the taper shank adapter and strike the head of the cotter with a manual hammer supporting on a rests. (Fig. 13)

9.Using the side handle

When you wish to change a position of the side handle, turn grip of the side handle counterclockwise

to loosen it, and then fasten it firmly.

CAUTION:

When boring a hole, there can be a case where the machine attempts to rotate by the reaction at the time of penetrating a concrete wall and/or when a tip of the blade comes in contact with the rebar. Firmly fasten the side handle and hold the machine with both of your hands. Unless you hold it securely, an accident can occur.

HOW TO USE THE CORE BIT (FOR LIGHT LOAD)

When boring penerating large holes use the core bit (for light loads). At that time use with the center pin and the core bit shank provided as optional accessories.

1.Mounting

CAUTION

Be sure to turn power OFF and disconnect the plug from the receptacle.

(1) Mount the core bit to the core bit shank. (Fig. 14). Lubricate the thread of the core bit shank to facilitate disassembly.

(2) Mount the core bit to the rotary hammer (Fig. 15).

(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. 16).

2.How to bore (Fig. 17)

(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.

3.Dismounting (Fig. 18)

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.

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. 19)

(2)Supply 30g of Hitachi Electric Hammer Grease A (standard accessory, contained in tube) in the crank case.

(3)After replacing the grease, reassemble the crank cover securely. At this time, do not damage or lose the oil seal.

NOTE:

The Hitachi Electric Hammer Grease A is of the low viscosity type. When the grease is consumed, purchase from the authorized Hitachi Service Center.

MAINTENANCE AND INSPECTION

1.Inspecting the drill bits

Since use of a dull tool will cause motor malfunctioning and degraded efficiency, replace the drill bit with new ones or resharpen them without delay when abrasion is noted.

2.Inspecting the mounting screws:

Regularly inspect all mounting screws and ensure that they are properly tightened. Should any of the screws be loose, retighten them immediately. Failure to do so could result in serious hazard.

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

For your continued safety and electrical shock protection, carbon brush inspection and replacement on this tool should ONLY be performed by a HITACHI AUTHORIZED SERVICE CENTER.

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