Milwaukee 0779-20 Manuel De L'utilisateur page 4

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
groove Closed (Locked)
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.
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WARNING
To reduce the risk of explosion,
e l e c t r i c s h o c k a n d p r o p e r t y
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 fi rmly
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
suffi cient 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 fi nal tightening.
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