Manual Hitachi WH10DFL (page 9 of 52) (English, German, Dutch, French, Italian, Portuguese, Spanish)

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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.

MAINTENANCE AND INSPECTION

1. Inspecting the driver bit

Using a broken bit or one with a worn out tip is

dangerous because the bit can slip. Replace it.

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. Cleaning of the outside

When the driver drill is stained, wipe with a soft dry

cloth or a cloth moistened with soapy water. Do not

use chloric solvents, gasoline or paint thinner, for

they melt plastics.

5. Storage

Store the driver drill in a place in which the

temperature is less than 40°C and out of reach of

children.

6. Service parts list

CAUTION:

Repair, modification and inspection of Hitachi Power

Tools must be carried out by a Hitachi Authorized

Service Center.

This Parts List will be helpful if presented with the

tool to the Hitachi Authorized Service Center when

requesting repair or other maintenance.

In the operation and maintenance of power tools, the

safety regulations and standards prescribed in each

country must be observed.

MODIFICATIONS:

Hitachi Power Tools are constantly being improved

and modified to incorporate the latest technological

advancements.

Accordingly, some parts may be changed without

prior notice.

GUARANTEE

We guarantee Hitachi Power Tools in accordance with

statutory/country specific regulation. This guarantee does

not cover defects or damage due to misuse, abuse, or

normal wear and tear. In case of complaint, please send

the Power Tool, undismantled, with the GUARANTEE

CERTIFICATE found at the end of this Handling

instruction, to a Hitachi Authorized Service Center.

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

EN60745 and declared in accordance with ISO 4871.

Measured A-weighted sound power level: 103 dB (A)

Measured A-weighted sound pressure level: 92 dB (A)

Uncertainty KpA: 3 dB (A).

Wear hearing protection.

Vibration total values (triax vector sum) determined

according to EN60745.

Impact tightening of fasteners of the maximum capacity

of the tool:

Vibration emission value

ah = 18.1 m/s

Uncertainty K = 1.5 m/s

01Eng_WH10DFL_WE 1/16/09, 11:028

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Hitachi WH10DFL Manual

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