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OPERATIONAL CAUTIONS

1.Confirm the line voltage (Fig. 4)

The available tightening torque is in- fluenced by line voltage. Reduced line voltage lowers the available tightening torque.

For example, if you use a 120 V type wrench on a 110 V line the available tightening torque will be reduced to 70 to 90%. When extending the power cord, use an extension cord which is as short as possible. When the line volt- age is low and a long extension cord is needed a step up transformer should be used. The relation between the line voltage and the tightening torque are shown in the figures.

ft–lbs (kg-m)

 

 

M22 ⋅ 70 (F10T)

 

 

 

 

 

588(80)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

514(70)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

torque

 

 

 

Rating 120V

 

 

 

 

 

 

 

 

440(60)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Tightening

367(50)

 

 

 

 

 

 

110V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

294(40)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

220(30)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

4

6

 

8

10 (s)

 

0

 

Tightening time

Fig. 4

2.Do not touch the bumper or hammer case during continuous operation

The bumper and hammer case become hot during continuous screw tightening so be careful not to touch them at that time.

3.Work at a tightening torque suitable for the bolt under impact

The optimum tightening torque for nuts and bolts differs with material and size of the nuts and bolts. An excessively large tightening torque for a small bolt may stretch or break the bolt. The tightening torque increases proportionally to the operating time. Use the correct operating time for the bolt.

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 tight- ness 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 develops. 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.

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