HOW to Handle a Core BIT

English

2. When a taper shank adapter is used. (Fig. 13)

(1)Install drill bit with taper shank in the taper shank adapter.

(2)Turn the power on and drill a base hole to the depth sounded by indicating groove on the drill bit.

(3)After cleaning out dust with a syringe, attach the plug to the anchor tip and drive in the anchor with a manual hammer.

(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 hammer supporting on a rest. (Fig. 14)

When a core bit is used, large caliber holes and blind holes can be drilled. In this case, use optional accessories for core bits (such as a center pin and core bit shank) for more rational operation.

1. Mounting

CAUTION

Prior to mounting a core bit, always disconnect the plug from the power supply receptacle.

(1)Mount the core bit on the core bit shank. (Fig. 15) Before that, feed oil to the screw portion of core bit shank for easy dismount.

(2)Mount the core bit shank on the drill main body in the same manner as in mounting the drill bit and the bull point. (Fig. 16)

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

(4)Fit in the guide plate by aligning its concaved portion with the core bit tip. When the position of the concave is shifted by turning the guide plate right or left, the guide plate never slips off even when the drill is used in a downward direction. (Fig. 17)

2. Drilling holes

(1)Insert the plug into a power supply receptacle.

(2)A spring is built in the center pin. By straightly and gently pressing it to the wall or floor surface, the entire surface of the core bit tip attains contact to start the hole drilling job. (Fig. 18)

(3)When the hole depth reaches approximately 5 mm, the hole position can be determined. Then remove the center pin and guide plate from the core bit and continue the hole drilling job.

CAUTION

When removing the center pin and guide plate, always disconnect the plug from the power supply

receptacle.

3. How to dismount the core bit

◯By holding the drill (with the core bit inserted) in an upward position, drive the drill to repeat impact operation two or three times, whereby the screw is loosened and the drill becomes ready for disassembly. (Fig. 19)

◯Remove the core bit shank from the drill, hold the core bit with one hand, and strongly strike the head of the hexagonal portion of the core bit shank with a manual hammer two or three times, whereby the round head screw is loosened and the drill is ready for disassembly. (Fig. 20)

HOW TO REPLACE GREASE

This machine is of full air-tight construction to protect against dust and to prevent lubricant leakage. Therefore, the machine can be used without lubrication for long periods. Replace the grease as described below.

1.Grease replacement period

After purchase, replace grease after every 6 months of usage. Ask for grease replacement at the nearest authorized Hitachi Service Agent. Proceed for replacement of grease.

2.Grease replacement

CAUTION

Before replacing the grease, turn the power off and

pull out the power plug.

(1)Remove the crank case cover and wipe off the grease inside. (Fig. 21)

(2)Supply 20g of Hitachi Electric Hammer Grease A (Standard accessory, contained in tube) to the crank case.

As the tube contain 30g of grease, supply 2/3 of the contained grease.

(3)After replacing the grease, install the crank case cover securely.

NOTE

The Hitachi Electric Hammer Grease A is of the low viscosity type. If necessary purchase from an authorized Hitachi Service Agent.

MAINTENANCE AND INSPECTION

1.Inspecting the tool

Since use of a dull tool will degrade efficiency and cause possible motor malfunction, sharpen or replace the tool as soon as 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 (Fig. 22)

The Motor employs carbon brushes which are consumable parts. When they become worn to or near the “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 Numbers shown in the figure. In addition, always keep carbon brushes clean and ensure that they slide freely within the brush holders.

5.Replacing carbon brushes

Loosen the two set screws and remove the tail cover. Remove the brush caps and carbon brushes. After replacing the carbon brushes, tighten the brush caps securely and install the tail cover with securely tightening two set screws.

NOTE

Due HITACHI’s continuing program of research and development, the specifications herein are subject to change without prior notice.