Manual Hitachi WH7DL (page 9 of 60) (English, German, Dutch, French, Italian, Portuguese, Spanish)

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English

HOW TO USE

1. Installing the bit

Always follow the following procedure to install driver

bit. (Fig. 4)

(1) Pull the guide sleeve forward.

(2) Insert the bit into the hexagonal hole in the socket.

(3) Release the guide sleeve and it returns to its original

position.

CAUTION

If the guide sleeve does not return to its original

position, then the bit is not installed properly.

2. Removing the bit

Please do the opposite point on the method of

installing bit.

3. Confirm that the battery is mounted correctly

4. Check the rotational direction

The bit rotates clockwise (viewed from the rear side)

by pushing the R-side of the selector button.

The L-side of the selector button is pushed to turn the

bit counterclockwise (See Fig. 5) (The

and

marks are provided on the body).

5. Switch operation

⅜ When the trigger switch is depressed, the tool rotates.

When the trigger is released, the tool stops.

⅜ The rotational speed of the drill can be controlled by

varying the amount that the trigger switch is pulled.

Speed is low when the trigger switch is pulled slightly

and increases as the trigger switch is pulled more.

NOTE

A buzzing noise is produced when the motor is about

to rotate. This is only a noise, not a machine failure.

6. Using the light

Pull the trigger switch to light up the light. The light

keeps on lighting while the trigger switch is being

pulled. The light goes out after releasing the trigger

switch. (Fig. 6)

CAUTION

Do not look directly into the light. Such actions could

result in eye injury.

7. Tightening and loosening screws

Install the bit that matches the screw, line up the bit in

the grooves of the head of the screw, then tighten it.

Push the impact driver just enough to keep the bit

fitting the head of the screw.

CAUTION

Applying the impact driver for too long tightens the

screw too much and can break it.

Tightening a screw with the impact driver at an angle

to that screw can damage the head of the screw and

the proper force will not be transmitted to the screw.

Tighten with this impact driver lined up straight with

the screw.

8. Using in the straight or pistol configuration

Use the tool in the straight configuration when using

in confined spaces. Use it in the pistol configuration

when using in other locations. Select the configuration

that best matches the tool application. When changing

the configuration, the tool will make a clicking sound

when it snaps into position. Bend (or extend) the tool

until the clicking sound is heard.

CAUTION

When using the tool in the pistol configuration, do

not hold onto the bending portion of the tool when

returning to the straight configuration. Your finger or

other part of the hand may be pinched by the bending

portion resulting in possible injury (Fig. 7).

9. Automatic spindle-lock mechanism

When the main switch is off, the bit is locked in place,

and the tool can be used as a manual screwdriver.

OPERATIONAL CAUTIONS

1. Resting the unit after continuous work

After use for continuous bolt-tightening work, rest

the unit for 15 minutes or so when replacing the

battery. The temperature of the motor, switch, etc.,

will rise if the work is started again immediately after

battery replacement, eventually resulting in burnout.

NOTE

Do not touch the metal parts, as it gets very hot

during continuous work.

2. Cautions on use of the speed control switch

This switch has a built-in, electronic circuit which

steplessly varies the rotation speed. Consequently,

when the switch trigger is pulled only slightly (low

speed rotation) and the motor is stopped while

continuously driving in screws, the components of the

electronic circuit parts may overheat and be damaged.

3. Use a tightening time suitable for the screw

The appropriate torque for a screw differs according to

the material and size of the screw, and the material

being screwed etc., so please use a tightening time

suitable for the screw. In particular, if a long tightening

time is used in the case of screws smaller than M8, there

is a danger of the screw breaking, so please confirm the

tightening time and the tightening torque beforehand.

4. Work at a tightening torque suitable for the bolt

under impact

The optimum tightening torque for nuts or bolts differs

with material and size of the nuts or bolts. An

excessively large tightening torque for a small bolt

may stretch or break the bolt. The tightening torque

increases in proportion to the operation time. Use

the correct operating time for the bolt.

5. Confirm the tightening torque

The following factors contribute to a reduction of the

tightening torque. So confirm the actual tightening

torque needed by screwing up some bolts before the

job with a hand torque wrench. Factors affecting the

tightening torque are as follows.

(1) Voltage

When the discharge margin is reached, voltage

decreases and tightening torque is lowered.

(2) Operating time

The tightening torque increases when the operating

time increases. But the tightening torque does not

increase above a certain value even if the tool is

driven for a long time.

(3) Diameter of bolt

The tightening torque differs with the diameter of the

bolt. Generally a larger diameter bolt requires larger

tightening torque.

(4) Tightening conditions

The tightening torque differs according to the torque

ratio; class, and length of bolts even when bolts with

the same size threads are used. The tightening torque

also differs according to the condition of the surface

of workpiece through which the bolts are to be

tightened. When the bolt and nut turn together, torque

is greatly reduced.

01Eng_WH7DL_WE 1/28/13, 1:19 PM8

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Hitachi WH7DL Manual

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