Manual Hitachi WR18DHL (page 11 of 64) (English, German, Dutch, French, Italian, Portuguese, Spanish)

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4. 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.

(5) Using optional parts

The tightening torque is reduced a little when an

extension bar, universal joint or a long socket is

used.

(6) Clearance of the socket

A worn or deformed hex. or a square-holed socket

will not give an adequate tightness to the fitting

between the nut or anvil, consequently resulting in

loss of tightening torque.

Using an improper socket which does not match to

the bolt will result in an insufficient tightening torque.

(7) Tightening torque varies, depending on the battery’s

charge level.

MAINTENANCE AND INSPECTION

1. Inspecting the socket

A worn or deformed hex. or a square-holed socket

will not give an adequate tightness to the fitting

between the nut or anvil, consequently resulting in

loss of tightening torque. Pay attention to wear of a

socket holes periodically, and replace with a new one

if needed.

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. Inspecting the carbon brushes (Fig. 7)

The motor employs carbon brushes which are

consumable parts. Since and excessively worn carbon

brush can result in motor trouble, replace the carbon

brush with new ones when it becomes worn to or

near the “wear limit”. In addition, always keep carbon

brushes clean and ensure that they slide freely whthin

the brush holders.

NOTE:

When replacing the carbon brush with a new one, be

sure to use the Hitachi Carbon Brush Code No. 328481.

5. Replacing carbon brushes

Take out the carbon brush by first removing the

brush cap and then hooking the protrusion of the

carbon brush with a slotted head screw driver, etc.,

as shown in Fig. 9.

When installing the carbon brush, choose the direction

so that the nail of the carbon brush agrees with the

contact portion outside the brush tube. Then push it

in with a finger as illustrated in Fig. 10. Lastly, install

the brush cap.

CAUTION:

Be absolutely sure to insert the nail of the carbon

brush into the contact portion outside the brush

tube. (You can insert whichever one of the two

nails provided.)

Caution must be exercised since any error in this

operation can result in the deformed nail of the

carbon brush and may cause motor trouble at an

early stage.

6. Cleaning of the outside

When the impact wrench 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.

7. Storage

Store the impact wrench 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.

8. 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.

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

modified (such as disassembly and replacement

of cells or other internal parts).

01Eng_WR18DHL_WE 12/14/10, 8:5811

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Hitachi WR18DHL Manual

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