WARNING Recharge only with the char- ger specified for the battery. For specific charg- ing instructions, read the operator’s manual supplied with your charger and battery.
WARNING Always remove battery pack before changing or removing acces- sories. Only use accessories specifically recommended for this tool. Others may be hazardous.
Removing Battery Pack from Tool
Push in the release buttons and pull the battery pack away from the tool.
Inserting Battery Pack into Tool
To insert the battery pack onto the tool, slide the pack onto the body of the tool. Make sure it latches securely into place.
1.For working in restricted spaces. Insert the battery pack from the front by pressing in the release buttons and sliding battery pack into the body of the tool. Insert the battery pack until clamp engages.
2.For optimum weight distribution and balance. Insert the battery pack from the back by press- ing in the release buttons and sliding the battery pack into the body of the tool. Insert the battery pack until clamp engages.
Attaching and Removing the Tool Hanger
1.To attach, remove the two top gear case screws.
2.Place the ring through the tool hanger.
3.Position the tool hanger on the tool over the two gear case screw holes.
4.Replace the two gear case screws. Hand tighten the screws.
5.To remove, reverse the procedure.
WARNING Use only sockets and other accessories specifically designed for use on impact wrenches and drivers. Other sockets and accessories might shatter or break caus- ing injury.
Attaching and Removing Accessories
(Cat. No. 0779-20)
This impact wrench is intended only for use with sockets designed for impact wrenches and that have a 1/2" square drive. Other sockets could shat- ter or break, causing injury.
1.To attach a socket or other ac- Detent cessory, align the hole in the pin
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 us- ing the Quick Change 1/2” Square Drive to 7/16” Hex Adapter)
Cat. No. 0799-20 is 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.
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 accessory. Release the collar.
Fig. 1 Open (Release)
Ball | |
retainer | Closed (Locked) |
groove |
WARNING Always remove battery pack before changing or removing acces- sories. Only use accessories specifically recommended for this tool. Others may be hazardous.
WARNING To reduce the risk of injury, keep hands away from the bit and all moving 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 pulled. Always allow the motor to come to a complete stop before using the 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, changing accessories, storing the tool and any time the tool is not in use.
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.
WARNING To reduce the risk of explosion, electric shock and property damage, always check the work area for hid- den pipes and wires before drilling.
WARNING To re-
duce the risk of injury,
only grasp tool by handle 
and red insulated sur- 
faces. Do not hold gray 
gear case when impact- 
ing or drilling.
Electric Brake
The electric brake engages when the trigger is released, causing the socket to stop and allow- ing you to proceed with your work. Generally, the socket stops within two seconds. However, there may be a delay between the time you re- lease 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 impact- ing. 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 impact- ing time.
Impacting for two seconds is generally sufficient for a 3/8" bolt and one second for a 5/16" bolt. How- ever, 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.
