Chicago Pneumatic CP8750 User Manual download pdf (Page 6)

page 6

OPERATION

To reduce the risk of injury, wear safety goggles

or glasses with side shields.

WARNING!

1. For forward (clockwise) rotation, pull the lower portion of the switch.

2. For reverse (counterclockwise) rotation, pull the upper portion of

the switch.

NOTE: To prevent damage to the motor and internal mechanism, allow

the motor to stop completely before switching from forward to reverse

or from reverse to forward.

Impacting Techniques

The longer a bolt, screw, or nut is impacted, the tighter it will become. To

help prevent damaging the fasteners or workpieces, avoid excessive

impacting. Be particularly careful when impacting smaller fasteners be-

cause they require less impacting to reach optimum torque.

Practice with various fasteners, noting the length of time required to

reach the desired torque. Check the tightness with a hand-torque wrench.

If the fasteners are too tight, reduce the impacting time. If they are not

tight enough, increase the impacting time.

Impacting for two seconds is generally sufficient for a 3/8" bolt and one

second for a 5/16" bolt. However, oil, dirt, rust or other matter on the

threads or under the head of the fastener affects the degree of tightness.

The torque required to loosen a fastener averages 75% to 80% of the

tightening torque, depending on the condition of the contacting surfaces.

On light gasket jobs, run each fastener down to a relatively light torque

and use a hand torque wrench for final tightening.

Starting and Stopping the Tool (Fig. 2)

This impact wrench is equipped with a rocker switch that offers both

forward and reverse rotation.

Fig. 2

Rocker

switch

WARNING!

To reduce the risk of injury, keep hands and cord

away from the bit and all moving parts.

WARNING!

To reduce the risk of explosion, electric shock

and property damage, always check the work

area for hidden pipes and wires before drilling.

WARNING!

To reduce the risk of injury, only grasp tool by

handle and black insulated surfaces . Do not hold

gray gear case when impacting or drilling.

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Chicago Pneumatic CP8750 User Manual Page 6

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