NEC 0799-20 manual Operation, Groove, Using the Forward/Reverse Switch, Electric Brake

1.To attach a socket or other accessory, align the hole in the accessory with the detent pin on the drive shank. Hold the detent pin in while pushing the socket onto the drive shank. The detent pin will snap into place in the hole to secure the socket.

2.To remove the accessory, insert a nail or other thin object into the hole in the accessory and press the detent pin in. Pull the accessory off the drive shank.

Attaching and Removing Accessories (Cat. No. 0799-20, or other Impact Wrenches using the Quick Change 1/2” Square Drive to 7/16” Hex Adapter)

Cat. No. 0799-20 and accessory Cat. No. 48-66-0061 are intended for use with drill bits and adapters with a 7/16” Hex Quick. The Quick Change shank has a ball-retainer groove. It is not intended for use with Hex Shank Bit Extensions.

Fig. 3 Open (Release)

Ball retainer	Closed (Locked)
groove

1.To attach an accessory, pull the chuck collar forward and insert the accessory shank. Release the collar. It may be necessary to pull the bit out slightly to engage the holding mechanism.

2.To remove the accessory, pull the chuck collar forward and remove the acces- sory. Release the collar.

OPERATION

WARNING

To reduce the risk of injury, keep hands away from the bit and all mov- ing parts. Always wear safety goggles or glasses with side shields.

Using the Forward/Reverse Switch

The forward/reverse switch may be set to three positions: forward, reverse and lock. Due to a lockout mechanism, the forward/ reverse switch can only be adjusted when the trigger is not depressed. Always al- low the motor to come to a complete stop before using the forward/reverse switch.

Fig. 4

Forward

Forward/ Reverse switch

Reverse

1.For forward (clockwise) rotation, push the forward/reverse switch in the direction shown. Check the direction of rotation before use.

2.For reverse (counterclockwise) rotation, push the forward/reverse switch in the direction shown. Check the direction of rotation before use.

3.To lock the trigger, push the forward/ reverse switch to the center position. The trigger will not work when the forward/reverse switch is in the locked position. Always lock the trigger or remove the battery pack before performing maintenance, chang- ing accessories, storing the tool and any time the tool is not in use.

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 red insulated surfaces (Fig. 5). Do not hold gray gear case when impacting or drilling.

Fig. 5

Starting, Stopping and Controlling Speed

This impact wrench may be operated at any speed from 0 to full speed.

1.To start the tool, grasp the handle firmly and pull the trigger.

2.To vary the speed, increase or decrease the pressure on the trigger. The further the trigger is pulled, the greater the speed.

3.To stop the tool, release the trigger.

Electric Brake

The electric brake engages when the trigger is released, causing the socket to stop and allowing you to proceed with your work. Generally, the socket stops within two seconds. However, there may be a delay between the time you release the trigger and when the brake engages. Occasionally the brake may miss completely. If the brake misses frequently, the impact wrench needs servicing by an authorized MILWAUKEE service facility.

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 because 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. However, if rust or corrosion causes seizing, more torque may be required.

On light gasket jobs, run each fastener down to a relatively light torque and use a hand torque wrench for final tightening.

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