Hitachi Koki USA DH 20DV manual Lubrication, Maintenance and Inspection

English

pulled slightly and increases as the switch is pulled more.

2.Rotation + Striking

Align the “ ” mark with the “” mark by rotating

the change lever to set the “Rotation + Striking” mode. (Fig. 10)

(1)Mount the drill bit.

(2)Pull the trigger switch after applying the drill bit tip to the drilling position. (Fig. 7)

(3)Pushing the hammer drill forcibly is not necessary at all. Pushing slightly so that drill dust comes out gradually is just sufficient.

CAUTION:

When the drill bit touches construction iron bar, the bit will stop immediately and the hammer drill will

react to revolve. Therefore please grip the side handle and handle tightly as shown in Fig. 7.

3.Rotation only

Align the “ ” mark with the “” mark by rotating the change lever to set the “Rotation only” mode. (Fig. 10)

To drill a wood or metal material using the optional

drill chuck and chuck adapter, proceed as follows. Installing drill chuck and chuck adapter: (Fig. 12)

(1)Attach the drill chuck to the chuck adaptor.

(2)The part of the SDS-plus shank is the same as the

drill bit. Therefore, refer to the item of “Mounting the drill bit” for attaching it.

CAUTIONS:

◯Application of force more than necessary will not only expedite work at all, but will deteriorate the tip edge of the drill bit and reduce the service life of the hammer drill in addition.

◯Drill bit may snap off while withdrawing the hammer drill from the drilled hole. For withdrawing, it is important to use a pushing motion.

◯Do not attempt to use the hammer drill in the rotation and striking mode with the drill chuck and chuck adapter attached. This would seriously shorten the service life of every component of the machine.

4.When driving wood screws (Fig. 14)

(1) Selecting a suitable driver bit

Employ plus-head screws, if possible, since the driver bit easily slips off the heads of slotted-head screws.

(2) Tightening wood screws

◯ Prior to tightening wood screws, make pilot holes suitable for them in the wooden board. Apply the bit to the screw head grooves and gently drive the screws in the holes.

CAUTION:

Exercise care in preparing a pilot hole suitable for the wood screw taking the hardness of the wood into consideration. Should the hole be excessively small or shallow, requiring much power to drive the screw into it, the thread of the wood screw may sometimes be damaged.

5.Using depth gauge (Fig. 13)

(1)Loosen the knob on the side handle, and insert the stopper into the mounting hole on the side handle.

(2)Adjust the depth gauge position according to the depth of the hole and tighten the knob bolt securely.

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

(1)Mount the taper shank adapter to the hammer drill. (Fig. 15)

(2)Mount the drill bit (taper shank) to the taper shank adapter. (Fig. 15)

(3)Turn the switch ON, and drill a hole to 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 hammer supporting on the rest. (Fig. 16)

LUBRICATION

Low viscosity grease is applied to this hammer drill so that it can be used for a long period without replacing the grease. Please contact the nearest service center for grease replacement when any grease is leaking form loosened screw.

Further use of the hammer drill despite the grease shortage causes damage to reduce the service life.

CAUTION:

A specific grease (FG-6A) is used with this machine, therefore, the normal performance of the machine may be badly affected by use of different grease. Please be sure to let one of our service centers to undertake replacement of the grease.

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.Cleaning on the outside

When the power tool is stained, wipe with a soft dry cloth or a cloth moistened with soapy water. Do not use chloric solvents, gasoline or paint thinner, as they melt plastics.

4.Storage

Store the power tool in a place in which the temperature is less than 40°C and out of reach of children.

NOTE

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

Information concerning airborne noise and vibration The measured values were determined according to EN50144.

The typical A-weighted sound pressure level: 92 dB (A)

The typical A-weighted sound power level: 105 dB (A) Wear ear protection.

The typical weighted root mean square acceleration value: 8.0m/s2

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