Manual Hitachi WR 22 SA (page 8 of 44) (English, German, Dutch, French, Italian, Portuguese, Spanish)

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before further wear developes. Matching socket and

bolt sizes are shown in Table 1.

The numerical value of a socket designation denotes

the side to side distance (S) of its hex hole.

5. Holding the tool

Hold the Impact Wrench firmly with both hands by

the body handle and the side handle. In this case

hold the wrench in line with the bolt.

It is not necessary to push the wrench very hard.

Hold the wrench with a force just sufficient to

counteract the impact force.

6. 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) Line voltage:

The tightening torque decreases when the line

voltage becomes low (See Fig. 4).

(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 (See Fig. 4).

(3) Diameter of bolt:

The tightening torque differs with the diameter of

the bolt as shown in Fig. 4. Generally a larger

diameter bolt has a 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 metal through which the bolts are to be

tightened.

(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. Matching socket and bolt sizes are shown

in Table 1.

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

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 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. Inspecting the carbon brushes

For your continued safety and electrical shock

protection, carbon brush inspection and replacement

on this tool should ONLY be performed by a Hitachi

Authorized Service Center.

5. Replacing supply cord

If the supply cord of Tool is damaged, the Tool

must be returned to Hitachi Authorized Service

Center for the cord to be replaced.

6. Service parts list

A: Item No.

B: Code No.

C: No. Used

D: Remarks

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.

MODIFICATION

Hitachi Power Tools are constantly being improved

and modified to incorporate the latest technological

advancements.

Accordingly, some parts (i.e. code numbers and/or

design) 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.

01Eng_WR22SA_WE 6/16/10, 10:467

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Hitachi WR 22 SA Manual

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