Manual Hitachi WH14DJL (page 10 of 60) (English, German, Dutch, French, Italian, Portuguese, Spanish)

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4. Work at a tightening torque suitable for the bolt

under impact

The optimum tightening torque for nuts or bolts diﬀ ers

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 operaton time. Use the correct operating

time for the bolt.

5. Conﬁ rm the tightening torque

The following factors contribute to a reduction of the

tightening torque. So conﬁ rm the actual tightening torque

needed by screwing up some bolts before the job with

a hand torque wrench. Factors aﬀ ecting 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 diﬀ ers with the diameter of the bolt.

Generally a larger diameter bolt requires larger tightening

torque.

(4) Tightening conditions

The tightening torque diﬀ ers according to the torque ratio;

class, and length of bolts even when bolts with the same

size threads are used. The tightening torque also diﬀ ers

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 may

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 impact driver 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.

5. Storage

Store the impact driver in a place in which the temperature

is less than 40°C, and out of reach of children.

NOTE

Make sure that the battery is fully charged when stored

for a long period (3 months or more). The battery with

smaller capacity may not be able to be charged when

used, if stored for a long period.

NOTE

Storing Lithium-ion Batteries

Make sure the lithium-ion batteries have been fully

charged before storing them.

Prolonged storage of batteries with a low charge may

result in performance deterioration, signiﬁ cantly reducing

battery usage time or rendering the batteries incapable of

holding a charge.

However, signiﬁ cantly reduced battery usage time may

be recovered by repeatedly charging and using the

batteries two to ﬁ ve times.

If the battery usage time is extremely short despite

repeated charging and use, consider the batteries dead

and purchase new batteries.

6. Service parts list

CAUTION

Repair, modiﬁ cation 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 modiﬁ ed to incorporate the latest technological

advancements.

Accordingly, some parts may be changed without prior

notice.

Important notice on the batteries for the Hitachi

cordless power tools

Please always use one of our designated genuine

batteries. We cannot guarantee the safety and

performance of our cordless power tool when used with

batteries other than these designated by us, or when

the battery is disassembled and modiﬁ ed (such as

disassembly and replacement of cells or other internal

parts).

GUARANTEE

We guarantee Hitachi Power Tools in accordance with

statutory/country speciﬁ c 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 speciﬁ cations herein are subject to

change without prior notice.

000Book_WH14DJL_WE.indb 10000Book_WH14DJL_WE.indb 10 2014/02/17 16:48:532014/02/17 16:48:53

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Hitachi WH14DJL Manual

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