Milwaukee Rotary Hammer User Manual
Cat. No.
No de Cat.
Cat. No.
5337-20, 5337-21
5339-20, 5339-21
5340-20, 5340-21
5342-20, 5342-21
OPERATOR'S MANUAL
MANUEL de L'UTILISATEUR
MANUAL del OPERADOR
HEAVY-DUTY ROTARY HAMMERS AND DEMOLITION HAMMERS
EXTRA ROBUSTES MARTEAUX ROTATIFS ET MARTEAU DE DÉMOLISSEUR
ROTOMARTILLOS Y MARTILLOS PERFORADORES DE
DEMOLICIÓN HEAVY-DUTY
TO REDUCE THE RISK OF INJURY, USER MUST READ OPERATOR'S MANUAL.
AFIN DE RÉDUIRE LE RISQUE DE BLESSURES, L'UTILISATEUR DOIT LIRE LE MANUEL DE L'UTILISATEUR.
PARA REDUCIR EL RIESGO DE LESIONES, EL USUARIO DEBE LEER EL MANUAL DEL OPERADOR.
page 2
GENERAL SAFETY RULES — FOR ALL POWER TOOLS
WARNING
Failure to follow all instructions listed below may result in electric shock, fi re and/or serious injury. The term "power tool" in all of the
warnings listed below refers to your mains-operated (corded) power tool or battery-opearted (cordless) power tool.
SAVE THESE INSTRUCTIONS
READ ALL INSTRUCTIONS
WORK AREA SAFETY
1. Keep work area clean and well lit. Cluttered or dark areas invite accidents.
2. Do not operate power tools in explosive atmospheres, such as
in the presence of fl ammable liquids, gases, or dust. Power tools
create sparks which may ignite the dust or fumes.
3. Keep children and bystanders away while operating a power tool.
Distractions can cause you to lose control.
ELECTRICAL SAFETY
4. Power tool plugs must match the outlet. Never modify the plug in
any way. Do not use any adapter plugs with earthed (grounded)
power tools. Unmodifi ed plugs and matching outlets will reduce risk
of electric shock.
5. Avoid body contact with earthed or grounded surfaces such as
pipes, radiators, ranges and refrigerators. There is an increased risk
of electric shock if your body is earthed or grounded.
6. Do not expose power tools to rain or wet conditions. Water entering
a power tool will increase the risk of electric shock.
7. Do not abuse the cord. Never use the cord for carrying, pulling, or
unplugging the power tool. Keep cord away from heat, oil, sharp
edges, or moving parts. Damaged or entangled cords increase the
risk of electric shock.
8. When operating a power tool outdoors, use an extension cord suit-
able for outdoor use. Use of a cord suitable for outdoor use reduces
the risk of electric shock.
PERSONAL SAFETY
9. Stay alert, watch what you are doing and use common sense when
operating a power tool. Do not use a power tool while you are tired
or under the infl uence of drugs, alcohol or medication. A moment
of inattention while operating power tools may result in serious personal
injury.
10. Use safety equipment. Always wear eye protection. Safety equip-
ment such as dust mask, non-skid safety shoes, hard hat, or hearing
protection used for appropriate conditions will reduce personal injuries.
11. Avoid accidental starting. Ensure the switch is in the off-position
before plugging in. Carrying tools with your fi nger on the switch or
plugging in power tools that have the switch on invites accidents.
12. Remove any adjusting key or wrench before turning the power
tool on. A wrench or a key left attached to a rotating part of the power
tool may result in personal injury.
13. Do not overreach. Keep proper footing and balance at all times. This
enables better control of the power tool in unexpected situations.
14. Dress properly. Do not wear loose clothing or jewellery. Keep your
hair, clothing and gloves away from moving parts. Loose clothes,
jewellery, or long hair can be caught in moving parts.
15. If devices are provided for the connection of dust extraction and
collection facilities, ensure these are connected and properly used.
Use of these devices can reduce dust-related hazards.
16. Do not force the power tool. Use the correct power tool for your
application. The correct power tool will do the job better and safer at
the rate for which it was designed.
17. Do not use the power tool if the switch does not turn it on and off.
Any power tool that cannot be controlled with the switch is dangerous
and must be repaired.
18. Disconnect the plug from the power source and/or the battery pack
from the power tool before making any adjustments, changing accessories, or storing power tools. Such preventive safety measures
reduce the risk of starting the tool accidentally.
19. Store idle power tools out of the reach of children and do not al-
low persons unfamiliar with the power tools or these instructions
to operate power tools. Power tools are dangerous in the hands of
untrained users.
20. Maintain power tools. Check for misalignment or binding of moving
parts, breakage of parts and any other condition that may affect the
power tool's operation. If damaged, have the power tool repaired
before use. Many accidents are caused by poorly maintained power
tools.
21. Keep cutting tools sharp and clean. Properly maintained cutting
tools with sharp cutting edges are less likely to bind and are easier to
control.
22. Use the power tool, accessories and tool bits etc., in accordance
with these instructions and in the manner intended for the particular type of power tool, taking into account the working conditions
and the work to be performed. Use of the power tool for operations
different from those intended could result in a hazardous situation.
23. Have your power tool serviced by a qualifi ed repair person using
only identical replacement parts. This will ensure that the safety of
the power tool is maintained.
1. Hold power tools by insulated gripping surfaces when performing
an operation where the cutting tool may contact hidden wiring or
its own cord. Contact with a “live” wire will make exposed metal parts
of the tool “live” and shock the operator.
2. Maintain labels and nameplates. These carry important information.
If unreadable or missing, contact a MILWAUKEE service facility for a
free replacement.
3. WARNING! Some dust created by power sanding, sawing, grinding,
drilling, and other construction activities contains chemicals known to
cause cancer, birth defects or other reproductive harm. Some examples
of these chemicals are:
• lead from lead-based paint
• crystalline silica from bricks and cement and other masonry products,
and
• arsenic and chromium from chemically-treated lumber.
Y our risk from these exposures varies, depending on how often you do
this type of work. To reduce your exposure to these chemicals: work
in a well ventilated area, and work with approved safety equipment,
such as those dust masks that are specifi cally designed to fi lter out
microscopic particles.
4. Wear ear protectors. Exposure to noise can cause hearing loss.
5. Use auxiliary handles supplied with the tool. Loss of control can
cause personal injury.
POWER TOOL USE AND CARE
SERVICE
SPECIFIC SAFETY RULES
page 3
Symbology
Specifi cations
BPM
Double Insulated
Volts Alternating Current
Amps
No Load Revolutions per
Minute (RPM)
Blows per Minute (BPM)
Underwriters Laboratories, Inc.
Mexican Approvals Marking
Max
Percussion
Core Bit
Diameter
--
--
--
--
†
6"
†
6"
†
6"
†
6"
†
Chisels
"Chiseling
Chipping"
See
and
Chisel Shank
Type
3/4" Hex
3/4" Hex
SDS-Max
SDS-Max
3/4" Hex with
21/32" Round
3/4" Hex with
21/32" Round
SDS-Max
SDS-Max
Cat.
No.
5337-20
5337-21
5339-20
5339-21
5340-20
5340-21
5342-20
5342-21
Volts
AC
120
120
120
120
120
120
120
120
Amps
14
14
14
14
15
15
15
15
No Load
RPM *
--
--
--
--
125 - 250
125 - 250
125 - 250
125 - 250
Blows/
Minute
975-1950*
975-1950*
975-1950*
975-1950*
975-1950*
975-1950*
975-1950*
975-1950*
Max
Percussion
Drill Bit
Diameter
--
--
--
--
2" Spline
2" Spline
2" SDS-Max
2" SDS-Max
* EFCC - The Electronic Feedback Control Circuit maintains constant speed under varying
load conditions.
† Use MILWAUKEE core bits Cat. No. 48-20-5125 through 48-20-5165. Do not use LHS
(Large Hole System) Components with rotary hammers 5340-20 and 5342-20. The bits
could fail, breaking apart at the threaded stud and causing injury and property damage.
FUNCTIONAL DESCRIPTION
12
11
Cat. No. 5342-20
5
1. Vibration isolation system
2. On/Off trigger switch
3. Soft grip handle
4. Service indicator light
5. Speed control dial
6. Lock-on button (Cat. Nos. 5337-20, 5339-20 only)
9
7. Spade side handle (Cat. Nos. 5337-20, 5339-20 only)
8. Spade side handle adjusting knob (Cat. Nos. 5337-20, 5339-20 only)
9. Bit lock (Cat. Nos. 5337-20, 5340-20 only)
10. Straight side handle (must be used when hammering with rotation)
11. Straight side handle mounting positions (3 locations)
12. Action selector (Cat. No. 5339-20, 5342-20 only)
4
1
10
6
1
11
2
3
11
Cat. No. 5337-20
7
1
8
page 4
GROUNDING EXTENSION CORDS
WARNING
Improperly connecting the grounding wire can result in the risk of
electric shock. Check with a qualifi ed electrician if you are in doubt
as to whether the outlet is properly grounded. Do not modify the
plug provided with the tool. Never remove the grounding prong
from the plug. Do not use the tool if the cord or plug is damaged. If
damaged, have it repaired by a MILWAUKEE service facility before
use. If the plug will not fi t the outlet, have a proper outlet installed
by a qualifi ed electrician.
Grounded tools require a three wire extension cord. Double insulated tools
can use either a two or three wire extension cord. As the distance from the
supply outlet increases, you must use a heavier gauge extension cord. Using extension cords with inadequately sized wire causes a serious drop in
voltage, resulting in loss of power and possible tool damage. Refer to the
table shown to determine the required minimum wire size.
The smaller the gauge number of the wire, the greater the capacity of the
cord. For example, a 14 gauge cord can carry a higher current than a 16
gauge cord. When using more than one extension cord to make up the total
length, be sure each cord contains at least the minimum wire size required. If
you are using one extension cord for more than one tool, add the nameplate
amperes and use the sum to determine the required minimum wire size.
Grounded Tools:
Tools with Three Prong Plugs
Tools marked “Grounding Required”
have a three wire cord and three
prong grounding plug. The plug must
be connected to a properly grounded
outlet (See Figure A). If the tool should
electrically malfunction or break down,
grounding provides a low resistance
path to carry electricity away from
the user, reducing the risk of electric
shock.
The grounding prong in the plug is connected through the green wire inside
the cord to the grounding system in the tool. The green wire in the cord must
be the only wire connected to the tool's grounding system and must never
be attached to an electrically “live” terminal.
Y our tool must be plugged into an appropriate outlet, properly installed and
grounded in accordance with all codes and ordinances. The plug and outlet
should look like those in Figure A.
Double Insulated Tools:
Tools with Two Prong Plugs
Tools marked “Double Insulated” do
not require grounding. They have a
special double insulation system which
satisfies OSHA requirements and
complies with the applicable standards
of Underwriters Laboratories, Inc., the
Canadian Standard Association and
the National Electrical Code. Double
Insulated tools may be used in either
of the 120 volt outlets shown in Figures
B and C.
Fig. A
Fig. B
Fig. C
Guidelines for Using Extension Cords
• If you are using an extension cord outdoors, be sure it is marked with
the suffi x “W-A” (“W” in Canada) to indicate that it is acceptable for
outdoor use.
• Be sure your extension cord is properly wired and in good electrical
condition. Always replace a damaged extension cord or have it repaired
by a qualifi ed person before using it.
• Protect your extension cords from sharp objects, excessive heat and
damp or wet areas.
Recommended Minimum Wire Gauge
Nameplate
Amperes
5.1 - 8
8.1 - 12
12.1 - 15
15.1 - 20
* Based on limiting the line voltage drop to fi ve
volts at 150% of the rated amperes.
for Extension Cords*
25'
0 - 5
16
16
14
12
10
Extension Cord Length
100'
14
12
10
10
150'
12
10
--
--
--
--
50'
16
16
14
12
10
75'
16
14
12
10
10
200'
12
--
--
--
--
READ AND SAVE ALL INSTRUCTIONS
FOR FUTURE USE.
page 5
TOOL ASSEMBLY
WARNING
To reduce the risk of injury, always unplug tool before attaching
or removing accessories or making adjustments. Use only specifi -
cally recommended accessories. Others may be hazardous.
Adjusting the Spade Side Handle (Cat. No. 5337-20, 5339-20 only)
The spade side handle is provided on demolition hammers only. Do not use
the spade side handle on Rotary Hammers.
1. Slightly loosen the spade side handle by turning the spade side handle
adjusting knob counterclockwise.
2. Rotate the spade side handle to the desired position. The handle can be
moved to the left or right of the tool, as well as forward or backward.
3. Securely tighten the spade side handle adjusting knob.
Adjusting the Straight Side Handle
Screw the straight side handle into one of three positions (top, left side, or
right side). Tighten securely.
WARNING
To reduce the risk of injury when hammering with rotation, always
use the straight side handle when using this tool. Always brace
or hold securely.
To reduce the risk of injury when hammering with or without rotation, wear safety goggles or glasses with side shields.
Installing Bits and Chisels
SDS Max shank
Cat. No. 5339-20,
5342-20
1. Clean and grease the bit or chisel shank.
2. Insert the bit or chisel into the nose of the tool.
3. Rotate the bit or chisel slowly until it aligns with the locking mechanism.
4. Push the bit or chisel into the tool until it locks (Fig. 2).
5. Pull on the bit or chisel to verify that it is locked into place.
6. To remove, pull the bit release collar toward the rear of the tool and
remove the bit or chisel.
WARNING
To reduce the risk of injury, use only specifi cally recommended
MILWAUKEE hammer chisels. Others may damage tool.
Installing Hammer Chisels
Round hex shank
(Cat. No. 5340-20)
Hex shank
(Cat. No. 5337-20)
Spline shank
Cat. No. 5340-20 only
Round hex shank
Cat. No. 5340-20 only
Hex shank
Cat. No. 5337-20 only
NOTE: To reduce the risk of damage to the bit lock, do not use round hex
shank bits in the 5337-20. Only use hex shank bits in this tool.
1. Clean and grease the bit or chisel shank.
2. Pull out the bit lock and rotate it 180°.
3. Insert the bit or chisel into the nose of the tool (Fig. 1)
NOTE: When using hex (on cat. no. 5337-20) or hex/round (on cat. no.
5340-20) bits or chisels, the notch in the shank must face toward the
bottom of the nosepiece of the tool.
4. Lock the bit or chisel by pulling out the bit lock and rotating it 180°.
5. Pull on the bit or chisel to verify that it is locked into place.
6. To remove, rotate the bit lock 180° and remove the bit or chisel.
NOTE: Use caution when handling hot bits and chisels.
Always clean and grease the chisel shank before inserting the chisel into the
tool. Inspect the shank to make sure it is not "mushroomed", as described
in "Maintaining Hammer Chisels". Always make sure that the chisel is in
good working condition before use.
page 6
OPERATION
Electronic Feedback Control Circuit
These hammers have an Electronic Feedback Control Circuit (EFCC) which
helps improve the operation and life of the tool.
Feedback Control
The electronic speed control circuit allows the tool to maintain constant
speed and torque between no-load and load conditions.
Soft Start
The Soft-Start feature reduces the amount of torque reaction to the tool and
the user. This feature gradually increases the motor speed up from zero to
the speed set by the speed control dial.
WARNING
To reduce the risk of injury, wear safety goggles or glasses with
side shields. Unplug the tool before changing accessories or
making adjustments.
Selecting Speed
The speed control dial on these hammers allows the user to adjust the
rotating speed (RPM) and the impact rate (BPM) of the tool.
To change the speed, set the speed control dial to the desired setting.
• Lower speeds provide more control when starting holes and reduce
'spalling' on breakthrough. Spalling occurs when pieces of material chip
off around the drilled hole on breakthrough. When chiseling in soft or
brittle materials, use lower speeds to reduce damage to surrounding
areas of the material.
• Higher speeds provide faster penetration when drilling and chiseling in
demolition work.
Selecting Action
Cat. No. 5337-20
The cat. no. 5337-20 demolition hammer is for "hammering-only". No rotation is available. Only chisels and other "hammering-only" accessories
should be used.
Cat. No. 5339-20 (Fig. 3)
The cat. no. 5339-20 demolition hammer is for "hammering-only". No rotation
is available. The action selector is used to select the action:
Cat. No. 5340-20
The cat. no. 5340-20 rotary hammer has "hammering-only" and "hammering
with rotation", depending on the type of shank inserted into the tool.
For "hammering-only": Insert a chisel or other "hammering-only" accessory
with a 3/4" Hex with 21/32" Round shank into the nose of the tool (see
"Inserting Bits and Chisels"). The rotational drive mechanism will run but not
engage with the chisel, resulting in "hammering-only" action.
For "hammering with rotation": Insert a drill or coring bit with a spline
xxx shank into the nose of the tool (see "Inserting Bits and Chisels"). The
rotational drive mechanism engages with the bit, resulting in "hammering
with rotation" action.
Cat. No. 5342-20 (Fig. 4)
Cat. no. 5342-20 rotary hammer has "hammering-only", "hammering with
rotation", and "chisel adjustment" settings. The action selector is used to
select the action:
Fig. 4
Hammering Only
1. Hammering only. For use with "hammering only" accessories.
Use this setting for chiseling.
2. Hammering with rotation. Use this setting for drilling holes with
drill bits. Do not use "hammering with rotation" when using chisels or
other "hammering-only" accessories.
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, twist
the chisel to the desired angle. Then, rotate the action selector to the
Hammering only setting for use.
NOTE: To engage the hammering mechanism, maintain pressure on the
bit/chisel. When pressure is released, hammering stops.
Chisel Adjustment
Hammering with
Rotation
WARNING
Fig. 3
Hammering Only Chisel Adjustment
1. Hammering only . For use with "hammering only" accessories. Use
this setting for chiseling.
2. 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, twist
the chisel to the desired angle. Then, rotate the action selector to the
"hammering only" setting for use.
NOTE: To engage the hammering mechanism, maintain pressure on the
bit/chisel. When pressure is released, hammering stops.
To reduce the risk of injury, when using chisels or other hammering-only accessories in cat. no. 5342-20, the action selector must
be set to the "hammering only" position.
Starting and Stopping the Tool
1. To start the tool, pull the trigger.
2. To stop the tool, release the trigger.
Locking the Trigger (Cat. No. 5337-20, 5339-20 only)
The lock button on the demolition hammers holds the trigger in the "On"
position for continuous use.
1. To lock the trigger, hold in the lock button while pulling the trigger.
Release the trigger.
2. To unlock the trigger, pull the trigger and release. The lock button will
pop out.
page 7
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.
Operator Force
These hammers feature the Vibration Isolation System to provide the operator with comfort without sacrifi cing power or performance. The motor housing
is suspended independently from the switch handle. Insulating elements
absorb 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.
WARNING
Applying greater pressure does not increase the tool's effectiveness. If the applied working pressure is too high, the shock
absorber will be pushed together making vibration to the handle
noticeably stronger.
WARNING
To reduce the risk of injury, hold or brace securely. Always be
prepared for drill reaction when bit binds, when hole becomes
clogged, when striking embedded materials, and during hole
breakthrough.
4. Pull the trigger. Always hold the tool securely using the straight handle
and trigger handle and maintain control.
5. Use only enough pressure to hold the tool in place, engage the hammering mechanism, and prevent the tip of the bit from wandering. This
tool has been designed to achieve top performance with only moderate
pressure. Let the tool do the work.
When pressure is released, hammering stops.
6. 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 fl utes
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.
WARNING
Hammering Only
1. Insert a chisel or other "hammering only" accessory into the tool (see
"Installing Bits and Chisels").
2. Position the tool on the workpiece.
3. Grasp both handles fi rmly (trigger handle and either the spade handle
or straight handle).
4. Pull the trigger. Always hold the tool securely using two handles and
maintain control.
5. 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 pressure is released, hammering stops.
6. 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.
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.
Hammering with Rotation
1. Insert a drill or coring bit into the tool (see "Installing Bits and Chisels").
2. Position the tool on the workpiece.
3. Grasp both handles fi rmly (trigger handle and straight handle).
Use MILWAUKEE core bits Cat. No. 48-20-5125 through 48-20-5165.
Do not use LHS (Large Hole System) Components with rotary hammers 5340-20 and 5342-20. The bits could fail, breaking apart at the
threaded stud and causing injury and property damage.
Using Rotary Percussion Core Bits (Fig. 5 - 7)
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.
1. Clean and lubricate the threads on the adapter and core bit to make
later removal easier. Screw the threaded end of the adapter into 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 center of
the core bit (Fig. 5).
Fig. 5
3. Insert the adapter into the nose of the tool (see “Installing Bits and
Chisels”. Set the action selector to the hammering-with-rotation
setting.
page 8
4. Press the center pin fi rmly against your center mark, hold the tool fi rmly
and pull the trigger (Fig. 6).
Fig. 6
3. Remove the bit from the tool.
4. Install a standard fl uted bit, approximately 7/8" in diameter, onto the
tool.
5. Drill a perpendicular hole through the kerf of the large hole (Fig. 9).
• Depending on the location of the work, the hole should either break
through the other side of the hole/fl oor 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 (Fig. 9) as the dust will fall there when drilling
and can be evacuated more easily.
Fig. 9
NOTE: If a center pin and guide plate are not available, use a template
or notched board to start the hole (Fig. 7).
Fig. 7
5. After drilling to about the depth of the core bit teeth, remove the center
pin and guide plate from the core bit. Resume drilling.
6. To change the core bit, hold the tool upwards, pointing it away from
your body, and run the tool allowing rotation and impacting for about
fi ve seconds to loosen the core bit from the adapter shank.
NOTE: To make deeper holes, remove the core bit, break and remove
the core. 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 fl utes. Dust can clog the bit fl utes
and can make the bit bind in the hole. If this occurs, stop the tool, free
the bit and begin again.
Drill a hole through
the work.
6. Reinstall the core bit and continue drilling (Fig. 10 & 11). Dust and debris
will fall through the hole and optimize the cutting ability of the bit.
Fig. 10
Dust and debris
will fall through
the hole.
Top view
Fig. 11
Drilling Large Diameter Holes with Core Bits (Fig. 8-13)
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 fi rmly established in the cut (about 1/4" deep), remove
the bit from the cut (Fig. 8).
Fig. 8
Cut approximately
1/4" deep with a core
bit.
Side view
of slab
page 9
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 (Fig. 12).
• Chisel down into the kerf at several points 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.
Fig.
NOTE: If unable to drill a hole in the kerf, pull back on the bit with the ham-
mer running (Fig. 13). 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.
Fig. 13
Pull bit out as far
as possible once
or twice per inch
drilled.
Chiseling and Chipping
These MILWAUKEE Hammers may be used for chipping and chiseling.
When chiseling, hold the tool at an angle to the workpiece. Work from a
corner or close to the edge of the workpiece, breaking off one small area
at a time rather than attempting too large an area.
A variety of accessories are available.
Bushing Tools
Used to surface concrete.
Mortar Cutting Chisels (Seam Tools)
For removing old mortar for tuck pointing or
caulking.
Bull Points
For demolition work and starting holes in
concrete slabs.
Flat Chisels
For edging, chipping or channeling.
Scaling Chisels
For removing weld spatter or scale and cutting straight lines.
Slotting Chisel
For slotting and cutting between drilled holes
in concrete and masonry.
page 10
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