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OPERATION
To reduce the risk of injury, always
WARNING
unplug tool before attaching or
removing accessories or making adjustments.
Use only specifically recommended accessories.
Others may be hazardous.
Always wear proper eye protection marked to
comply with ANSI Z87.1.
When working in dusty situations, wear appro-
priate respiratory protection or use an OSHA
compliant dust extraction solution.
Keep hands and cord away from the bit and all
moving parts.
Always use a side handle when using this tool.
Always brace or hold securely.
Cut embedded rebar only if this operation does
not affect the integrity of the building. If in doubt,
consult a structural engineer. Tool operator fully
responsible for adverse structural effects.
Selecting Action
These MILWAUKEE Rotary Hammers
have three settings: hammering with
rotation, hammering-only, and chisel
adjustment.
1. Hammering with rotation. Use this
setting for drilling holes with drill
bits.
2. Hammering only. For use with
"hammering-only" accessories. Use
this setting for chiseling or setting
self-drilling anchors.
3. Chisel adjustment. Use this set-
ting to adjust the angle of the chisel
blade in relation to the tool. With a
chisel mounted in the tool:
• turn the knob to this setting
• rotate the chisel to the desired
angle
• turn the knob to "hammering-only".
NOTE: To engage the hammering mechanism, main-
tain pressure on the bit. When the pressure on the
bit is released, the hammering will stop.
Starting and Stopping
1. To start the tool, grasp the handle(s) firmly and
pull the trigger.
2. To stop the tool, release the trigger. Make sure
the tool comes to a complete stop before laying
the tool down.
Operating
Position the tool, grasp the handles firmly and pull
the trigger. Always hold the tool securely using both
handles to maintain control. This tool has been de-
signed to achieve top performance with only moder-
ate pressure. Let the tool do the work.
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.
Cold Starting
If this tool is stored for a long period of time or
at cold temperatures, it may not hammer ini-
tially because the lubrication has become stiff.
To warm up the tool:
1. Insert and lock a bit or chisel into the tool.
2. Pull the trigger and apply force to the bit or chisel
against a concrete or wood surface for a few
seconds. Release the trigger
3. Repeat until the tool starts hammering. The colder
the tool is, the longer it will take to warm up.
Using Rotary Percussion Core Bits
Core Bits are useful for drilling large or long holes
in concrete. 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.
1. Clean and lubricate the
threads on the adapter
and core bit to make
later removal easier.
Thread the adapter
shank to the rear of the
core bit.
2. Push the guide plate
onto the pointed end of
the center pin. Insert the
center pin and guide
plate assembly into the
core bit. Be sure the
small end of the center
pin is securely placed
into the hole in the cen-
ter of the core bit.
For LHS systems, screw
the threaded end of the centering bit into the core
bit.
NOTE: If using an extension, first thread the
adapter shank to the extension. Then thread the
core bit to the extension.
3. Insert the adapter into the nose of the tool as
described in "Installing Bits and Chisels". Set the
knob to the "hammering with rotation" setting.
4. Press the centering bit
firmly against your cen-
ter mark, hold the tool
firmly and pull the trig-
ger.
NOTE: If the 48-20-5099
threaded stud is used, or
a center pin and guide
plate are not available,
u s e a t e m p l a t e o r
notched board to start
the hole.
5. Start the tool. After
drilling to about the
depth of the core bit
teeth, remove the cen-
ter pin and guide plate
from the core bit (not
necesary for LHS sys-
tem). Resume drilling.
6. To change the core bit,
hold the tool upwards,
pointing it away from your body, and run it briefly
in forward to loosen the core bit from the adapter.
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