6
Selecting Hammering Speed
1. To
increase
the Hammering speed (2840 blows
per second), move the hammer speed control se-
lector to the large hammer. Use the high hammer
speed for harder materials, such as concrete.
2. To
decrease
the Hammering speed (2200 blows
per second), move the hammer speed control
selector to the small hammer. Use the low ham-
mer speed for softer materials, such as brick.
Starting and Stopping
1. Insert the accessory
2. Select the mode and hammering speed.
3. Position the tool on the workpiece.
4. Grasp both handles firmly (trigger handle and
either the spade handle or straight handle).
5. To
start
the tool, grasp the handles firmly and
pull the trigger. Always hold the tool securely
using two handles and maintain control.
6. Use only enough pressure to hold the tool in
place, engage the hammering mechanism, and
prevent the tip of the chisel from wandering.
This tool has been designed to achieve top
performance with only moderate pressure. Let
the tool do the work.
NOTE:
To engage the hammering mechanism,
maintain pressure on the bit/chisel. When pres-
sure is released, hammering stops.
7. To stop the tool, release the trigger. Make sure
the tool comes to a complete stop before laying
the tool down.
Chiseling
When chiseling or chipping, hold the tool at an
angle to the work area. For best performance, work
from a corner or close the edge of the work and
break off a small area at a time.
Drilling
When drilling deep holes, the speed may begin to
drop off. Pull the bit partially out of the hole while
the tool is running to help clear dust.
NOTE:
Do not use water to settle the dust since
it will clog the bit flutes and tend to make the bit
bind in the hole.
If a bit binds:
If the bit should bind, a built in, nonadjustable slip
clutch prevents the bit from turning when the tool
is held or braced securely. If this occurs
1. Turn off and unplug the tool.
2. Free the bit from the workpiece.
3. Clear debris from the hole.
4. Begin drilling again.
If a hammer iron gets stuck:
1. Unplug the tool.
2. Pull out bit lock and rotate it 180°.
3. Pull the tool off of the stuck accessory.
4. Remove the accessory from the workpiece.
Locking Trigger (Cat. No. 5446-21 only)
1. To lock on the trigger, pull the trigger and press
the lock button. Release the trigger.
2. To unlock the trigger, pull and release the trig-
ger.
Power and Service Indicators
When the tool is plugged in, the Power Indicator will
light. Unplug the tool before changing accessories
or making adjustments.
When the tool is in need of service (for example,
brushes need to be changed), the Service Indica-
tor will light. Stop using the tool and return it to the
nearest
MILWAUKEE
service facility for repairs.
Operating and Operator Force
Position the tool, grasp the handles firmly and pull
the trigger. Always hold the tool securely using both
handles to maintain control.
These hammers feature the Anti-Vibration System
to provide the operator with comfort without sacrific-
ing power or performance. Insulating elements ab-
sorb vibration when hammering and drilling.
Ideal
operator force
compresses the handle slightly
and allows the tool to work aggressively while the
handle provides maximum vibration dampening.
Excessive operator force
compresses the handle
too far and reduces the vibration dampening. Users
will be able to feel the difference and should adjust
the force to the handle accordingly.
A smooth, even flow of dust indicates the proper
drilling rate. If the speed begins to drop off when
drilling large or deep holes, pull the bit partially out
of the hole while the tool is running to help clear
dust. Do not use water to settle the dust since it
will clog the bit flutes and tend to make the bit
bind in the hole. If the bit should bind, a built-in,
non-adjustable slip clutch prevents the bit from
turning. If this occurs, stop the tool, free the bit
and begin again.
Do not let the bit spin in the hole without cutting. Do
not attempt to drill through steel reinforcing rods.
Both actions will damage the carbide.
Cold Hammering
If the hammer is stored for a long period of time or
at cold temperatures, the lubrication may become
stiff and the tool may not hammer initially or the
hammering may be weak. If this happens:
1. Insert a chisel into the tool.
2. Pull the trigger and apply the chisel against a
scrap piece of concrete.
3. Turn the tool On and Off every few seconds.
After 15 seconds to 2 minutes, the tool will start
hammering normally. The colder the hammer is,
the longer it will take to warm up.
Warning
Use
milWaukee
core bits.
Do not use LHS (Large Hole System) Com-
ponents with these rotary hammers. The bits
could fail, breaking apart at the threaded stud
and causing injury and property damage.
Using Rotary Percussion Core Bits
Core bits are useful for drilling larger holes for
conduit and pipe.
MILWAUKEE
Heavy-Duty Core
Bits have heat-treated steel bodies with durable
carbide tips. These core bits are specially designed
for fast, accurate drilling with combined hammering
and rotary action.
