Bedienungsanleitung Hitachi WR 16 SA (Seite 27 von 29) (Englisch, Dänisch, Schwedisch, Norwegisch, Finnisch)

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4. Selecting the socket to be matched to the bolt

Be sure to use a socket which is matched to the bolt

to be tightened. Using an improper socket will result

not only in insufficient tightening but also in damage

to the socket or nut.

A worn or deformed hex or square-holed socket will

not give an adequate tightness for fitting to the nut or

anvil consequently resulting in loss of tightening torque.

Pay attention to wear of socket holes, and replace

before further wear has developed. 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 large 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 of 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 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 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. 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.

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.

The typical A-weighted sound pressure level: 98 dB (A).

The typical A-weighted sound power level: 111 dB (A).

Uncertainty KpA: 3 dB (A).

Wear ear protection.

The typical weighted root mean square acceleration

value: 4.75 m/s

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