WARNING To reduce the risk of injury, always unplug tool before attaching or remov- ing accessories or making adjustments. Use only specifically recommended accessories. Others may be hazardous.
WARNING To reduce the risk of injury, wearsafetygogglesorglasseswithsideshields.
WARNING To reduce the risk of injury, keep hands and cord away from the bit and all moving parts.
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 set- 
ting self-drilling anchors. 
3.Chisel adjustment. Use this setting
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, maintain 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 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 designed to achieve top performance with only moderate 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. In-
sert the center pin and guide plate assembly into the core bit. Be sure the small end of the center pin is se- curely placed into the hole in the center 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, use a template or notched board to start the hole.
5.Start the tool. After drill- 
ing to about the depth
of the core bit teeth, remove the center pin and guide plate from the core bit (not nece- sary for LHS system). Resume drilling.
6.To change the core bit, hold the tool upwards, pointing it away from
NOTE: To make deeper holes, remove the core bit, break and remove the core, then resume drilling. When drilling long or deep holes, after each inch of penetration pull the bit partially out of the hole while the tool is running, to help clear dust from the bit flutes. Dust can clog the bit flutes and can make the bit bind in the hole. If this occurs, stop the tool, free the bit and begin again.
Drilling Large Diameter Holes with Core Bits When drilling holes with large diameter core bits, dust may build up in the cut and can cause the tool to stall, bind, or cut slowly. By creating an opening for the dust to escape, drilling time, bit stress, and tool stress can be reduced.
1.Start the cut as normal.
2.Once the bit is firmly estab- lished in the cut (about 1/4" deep), remove the bit from the cut.
3.Remove the bit from the tool.
4.Install a standard fluted bit, 
approximately 7/8" in diameter,
onto the tool.
5.Drill a perpendicular hole through the kerf of the large hole.
•Depending on the location of the work, the hole should either break through the other side of the hole/floor or extend 4"-5" past the end
of the workpiece (such as into the dirt below a concrete slab).
• If dust builds up in the hole, vacuum it out and continue drilling.
• If drilling through a wall, the
hole for dust should be drilled on the lowest part of the large hole kerf as the dust will fall there when drilling and can be evacuated more easily.
6.Reinstall the core bit and continue drilling. Dust and debris will fall through the hole and optimize the cut-
ting ability of the bit. NOTE: If unable to drill a hole in the kerf, pull back on the bit with the hammer running. This will remove some of the dust and debris from the cut. Repeat this for every inch of
drilling. If necessary, vacuum 
dust and debris from the cut
and surrounding area.
7. For core bits, once the maximum core bit depth is drilled, the core must be broken and removed.
•Install a chisel bit.
•Place the chisel into the hole kerf.
until the core is loose |
or broken. |
• Remove the core and |
vacuum/remove any |
remaining dust and |
debris. |
• Install the core bit and |
continue the cut. |
WARNING To reduce the risk of personal injury and damage to the tool or work:
•Always use the “hammering-only” setting to set the anchor. Never use the “hammering- with-rotation” setting to set the anchor.
•Never switch the tool to “hammering-with- rotation” until after the anchor has been set and the tooth anchor chuck has been removed from the anchor.
Setting Self-Drilling Anchors
MILWAUKEE Tooth Anchor Chucks require a “B” taper adapter.
1.Place the proper size tooth anchor chuck into the “B” taper adapter. Then insert the “B” taper adapter into the tool and lock it into place as described. See “Installing Bits and Chisels”.
2.Insert the anchor into the tooth anchor chuck. Set the knob for hammering only.
Set the anchor on | |
your mark and ham- | |
mer until the teeth | 1/8" |
have penetrated the |
concrete. | |
3.Set the knob for hammering with ro-
tation and drill until the chuck is 1/8" above the concrete. NOTE: It may be necessary to clean dust and cuttings from the anchor sev- eral times while drill- ing the hole.
4.Remove the anchor from the hole while the tool is running. Clean the dust and
cuttings from the anchor by pointing it
downward and turning the tool on and off sev- eral times. Clean the dust out of the hole with a vacuum cleaner or blowout bulb.
5.Place the expansion plug into the anchor and insert the an- chor into the hole. Switch the knob back to hammering
