OPERATOR'S MANUAL
MANUEL de L'UTILISATEUR
MANUAL del OPERADOR
Cat. No. / No de cat.
5337-20, 5337-21
5339-20, 5339-21
5340-20, 5340-21
5342-20, 5342-21
ROTARY HAMMERS AND DEMOLITION HAMMERS
MARTEAUX ROTATIFS ET MARTEAU DE DÉMOLISSEUR
ROTOMARTILLOS Y MARTILLOS PERFORADORES DE
DEMOLICIÓN
WARNING To reduce the risk of injury, user must read and understand operator's manual.
AVERTISSEMENT An de réduire le risque de blessures, l'utilisateur doit lire et bien
comprendre le manuel.
ADVERTENCIA Para reducir el riesgo de lesiones, el usuario debe leer y entender el manual.
GENERAL POWER TOOL
WARNING
SAFETY WARNINGS
Read all safety warnings, instruc-
tions provided with this power tool. Failure to
follow all instructions listed below may result in
electric shock, re and/or serious injury. Save all
warnings and instructions for future reference.
The term "power tool" in the warnings refers to your
mains-operated (corded) power tool or battery-oper-
ated (cordless) power tool.
tions, illustrations and specica-
WORK AREA SAFETY
• Keep work area clean and well lit. Cluttered or dark
areas invite accidents.
• Do not operate power tools in explosive atmo-
spheres, such as in the presence of ammable
liquids, gases or dust. Power tools create sparks
which may ignite the dust or fumes.
• Keep children and bystanders away while operating
a power tool. Distractions can cause you to lose control.
ELECTRICAL SAFETY
• 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. Unmodied plugs
and matching outlets will reduce risk of electric shock.
• 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.
• Do not expose power tools to rain or wet conditions.
Water entering a power tool will increase the risk of
electric shock.
• Do not abuse the cord. Never use the cord for car-
rying, 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.
• When operating a power tool outdoors, use an
extension cord suitable for outdoor use. Use of a cord
suitable for outdoor use reduces the risk of electric shock.
• If operating a power tool in a damp location is
unavoidable, use a ground fault circuit interrupter
(GFCI) protected supply. Use of an GFCI reduces
the risk of electric shock.
PERSONAL SAFETY
• 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 inuence of drugs, alcohol or medication. A
moment of inattention while operating power tools may
result in serious personal injury.
• Use personal protective equipment. Always wear
eye protection. Protective equipment such as a dust
mask, non-skid safety shoes, hard hat or hearing
protection used for appropriate conditions will reduce
personal injuries.
• Prevent unintentional starting. Ensure the switch
is in the o-position before connecting to power
source and/or battery pack, picking up or carrying
the tool. Carrying power tools with your nger on the
switch or energizing power tools that have the switch
on invites accidents.
• 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.
• Do not overreach. Keep proper footing and balance
at all times. This enables better control of the power
tool in unexpected situations.
• Dress properly. Do not wear loose clothing or
jewelry. Keep your hair and clothing away from
moving parts. Loose clothes, jewelry or long hair can
be caught in moving parts.
• If devices are provided for the connection of dust
extraction and collection facilities, ensure these are
connected and properly used. Use of dust collection
can reduce dust-related hazards.
• Do not let familiarity gained from frequent use of
tools allow you to become complacent and ignore
tool safety principles. A careless action can cause
severe injury within a fraction of a second.
POWER TOOL USE AND CARE
• 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.
• Do not use the power tool if the switch does not turn
it on and o. Any power tool that cannot be controlled
with the switch is dangerous and must be repaired.
• Disconnect the plug from the power source and/
or remove the battery pack, if detachable, from
the power tool before making any adjustments,
changing accessories, or storing power tools. Such
preventive safety measures reduce the risk of starting
the power tool accidentally.
• Store idle power tools out of the reach of children and
do not allow persons unfamiliar with the power tool
or these instructions to operate the power tool. Power
tools are dangerous in the hands of untrained users.
• Maintain power tools and accessories. Check for
misalignment or binding of moving parts, breakage
of parts and any other condition that may aect the
power tool’s operation. If damaged, have the power
tool repaired before use. Many accidents are caused
by poorly maintained power tools.
• Keep cutting tools sharp and clean. Properly
maintained cutting tools with sharp cutting edges are
less likely to bind and are easier to control.
• Use the power tool, accessories and tool bits etc.
in accordance with these instructions, taking into
account the working conditions and the work to be
performed. Use of the power tool for operations dierent
from those intended could result in a hazardous situation.
• Keep handles and grasping surfaces dry, clean
and free from oil and grease. Slippery handles and
grasping surfaces do not allow for safe handling and
control of the tool in unexpected situations.
SERVICE
• Have your power tool serviced by a qualied repair
person using only identical replacement parts. This
will ensure that the safety of the power tool is maintained.
SPECIFIC SAFETY RULES FOR
ROTARY HAMMER
• Wear ear protectors. Exposure to noise can cause
hearing loss.
• Use auxiliary handle(s), if supplied with the tool.
Loss of control can cause personal injury.
• Hold power tool by insulated gripping surfaces,
when performing an operation where the cutting
accessory may contact hidden wiring or its own
cord. Cutting accessory contacting a “live” wire may
make exposed metal parts of the power tool “live” and
could give the operator an electric shock.
• Keep hands away from all cutting edges and moving parts.
• Cut embedded rebar only if this operation does
not aect the integrity of the building. If in doubt,
consult a structural engineer. Tool operator fully
responsible for adverse structural eects.
2
•
WARNING
WARNING
WARNING
appropriate respiratory protection or use an OSHA
compliant dust extraction solution.
• Always use common sense and be cautious when
using tools. It is not possible to anticipate every
situation that could result in a dangerous outcome.
Do not use this tool if you do not understand these
operating instructions or you feel the work is beyond
your capability; contact Milwaukee Tool or a trained
professional for additional information or training.
• Maintain labels and nameplates. These carry
important information. If unreadable or missing, contact
a MILWAUKEE service facility for a free replacement.
•
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.
Your 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 specially designed to
lter out microscopic particles.
To reduce the risk of injury, when
working in dusty situations, wear
Some dust created by power sanding,
sawing, grinding, drilling, and other
EXTENSION CORDS
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.
Guidelines for Using Extension Cords
• If you are using an extension cord outdoors, be sure
it is marked with the sux “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
qualied person before using it.
• Protect your extension cords from sharp objects,
excessive heat and damp or wet areas.
Recommended Minimum Wire Gauge
For Extension Cords*
Extension Cord Length
Nameplate Amps
0 - 2.0
2.1 - 3.4
3.5 - 5.0
5.1 - 7.0
7.1 - 12.0
12.1 - 16.0
16.1 - 20.0
* Based on limiting the line voltage drop to ve volts at 150%
of the rated amperes.
25' 50' 75' 100' 150'
18
18
18
18
18
18
18
16
14
12
18
18
16
14
12
10
18
16
14
12
10
--
16
14
12
10
16
14
12
12
--
--
--
--
--
GROUNDING
Improperly connecting the grounding wire can result in the risk of
electric shock. Check with a qualied 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 t the outlet, have a
proper outlet installed by a qualied electrician.
Grounded Tools (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.
Your 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 (Two-Prong Plugs)
Tools marked “Double Insulated” do not require
grounding. They have a special double insulation
system which satises 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
READ AND SAVE ALL INSTRUCTIONS
FOR FUTURE USE.
3
FUNCTIONAL DESCRIPTION
Cat. No. 5342-20
12
11
1. Vibration isolation system
2. On/O 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)
4
1
10
6
5
11
1
2
3
9
11
8
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)
SPECIFICATIONS
Volts .............................................................120 AC
Volts .............................................................120 AC
Blows/Minute ........................................975 - 1950*
Chisels ......................See "Chiseling and Chipping"
Cat. No. ..................................................... 5337-20
Amps ...................................................................14
Chisel Shank type..................................3/4" Hex
Cat. No. ..................................................... 5337-21
Amps ...................................................................14
Chisel Shank type..................................3/4" Hex
Cat. No. ..................................................... 5339-20
Amps ...................................................................14
Chisel Shank type................................ SDS-Max
Cat. No. ..................................................... 5339-21
Amps ...................................................................14
Chisel Shank type................................ SDS-Max
Cat. No. ..................................................... 5340-20
Amps ...................................................................15
No Load RPM*......................................... 125 - 250
Max Percussion Drill Bit Diameter ............ 2" Spline
Max Percussion Core Bit Diameter ...................6"
Chisel Shank type....3/4" Hex with 21/32" Round
Cat. No. ..................................................... 5340-21
Amps ...................................................................15
No Load RPM*......................................... 125 - 250
Max Percussion Drill Bit Diameter ............ 2" Spline
Max Percussion Core Bit Diameter † ................. 6"
Chisel Shank type....3/4" Hex with 21/32" Round
† †
Cat. No. ..................................................... 5342-20
Amps ...................................................................15
No Load RPM*......................................... 125 - 250
† †
Max Percussion Drill Bit Diameter ....... 2" SDS-Max
Max Percussion Core Bit Diameter † ................. 6"
Chisel Shank type................................ SDS-Max
† †
Cat. No. ..................................................... 5342-21
Amps ...................................................................15
No Load RPM*......................................... 125 - 250
Max Percussion Drill Bit Diameter ....... 2" SDS-Max
† †
Max Percussion Core Bit Diameter † ................. 6"
Chisel Shank type................................ 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.
† †
See "Chiseling and Chipping".
Cat. No. 5337-20
7
1
†
† †
†
† †
†
† †
4
SYMBOLOGY
C
US
WARNING
WARNING
WARNING
Double Insulated
Volts
Amps
No Load Revolutions per Minute (RPM)
BPM
Read Operator's Manual
Approval Mark for Mexico
Alternating Current
Blows per Minute (BPM)
UL Listing for Canada and U.S.
ASSEMBLY
To reduce the risk of injury, always
removing accessories. Only use accessories
specically recommended for this tool. Others
may be hazardous.
Adjusting the Spade Side Handle
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 posi-
tions (top, left side, or right side). Tighten securely.
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.
unplug tool before changing or
(Cat. No. 5337-20, 5339-20 only)
To reduce the risk of injury when
hammering with rotation, always
Installing Bits and Chisels
Spline shank
Cat. No. 5340-20 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.
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.
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.
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.
MILWAUKEE hammer chisels. Others may damage tool.
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.
To reduce the risk of injury, use
only specifically recommended
Round hex shank
(Cat. No. 5340-20)
Hex shank
(Cat. No. 5337-20)
Installing Hammer Chisels
Round hex shank
Cat. No. 5340-20 only
Hex shank
Cat. No. 5337-20 only
5
OPERATION
WARNING
To reduce the risk of injury, always
removing accessories or making adjustments.
Use only specically recommended accessories.
Others may be hazardous.
Always wear proper eye protection marked to
comply with ANSI Z87.1.
When working in dusty situations, wear appropriate 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 aect the integrity of the building. If in doubt,
consult a structural engineer. Tool operator fully
responsible for adverse structural eects.
Electronic Feedback Control Circuit
These hammers have an Electronic Feedback Control Circuit (EFCC) which helps improve the operation
and life of the tool.
The electronic speed control circuit allows the tool to
maintain constant speed and torque between no-load
and load conditions.
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.
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 o 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.
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.
The cat. no. 5339-20 demolition ham-mer is for
"hammering-only". No rotation is available. The ac-
tion selector is used to select the action:
unplug tool before attaching or
Feedback Control
Soft Start
Selecting Speed
Selecting Action
Cat. No. 5337-20
Cat. No. 5339-20
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.
The cat. no. 5340-20 rotary hammer has "hammer-
ing-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 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 rotary hammer has "hammeringonly", "hammering with rotation", and "chisel adjustment" settings. The action selector is used to select
the action:
Hammering
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 "ham-
mering 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.
Cat. No. 5340-20
Cat. No. 5342-20
Chisel
Only
Adjustment
Hammering
Only
Chisel
Adjustment
Hammering
with Rotation
6
WARNING
To reduce the risk of injury, when
WARNING
WARNING
WARNING
only accessories in cat. no. 5342-20, the action
selector must be set to the "hammering only"
position.
1. To start the tool, grasp the handle(s) rmly 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.
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.
If the hammer is stored for a long period of time or at
cold temperatures, the lubrication may become sti
and the tool may not hammer initially or the hammer-
ing 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 O 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.
These hammers feature the Vibration Isolation
System to provide the operator with comfort without
sacricing power or performance. The motor housing
is suspended independently from the switch handle.
Insulating elements absorb vibration when hammer-
ing 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 dierence and should adjust
the force to the handle accordingly.
If the applied working pressure is too high, the
shock absorber will be pushed together making
vibration to the handle noticeably stronger.
1. Insert a chisel or other "hammering only" acces-
sory into the tool (see "Installing Bits and Chisels").
2. Position the tool on the workpiece.
3. Grasp both handles 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.
using chisels or other hammering-
Starting and Stopping the Tool
Locking the Trigger
(Cat. No. 5337-20, 5339-20 only)
Cold Hammering
Operator Force
Applying greater pressure does not
increase the tool's eectiveness.
Hammering Only
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 o 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 o of the stuck accessory.
4. Remove the accessory from the workpiece.
1. Insert a drill or coring bit into the tool (see "Install-
2. Position the tool on the workpiece.
3. Grasp both handles rmly (trigger handle and
pared 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
5. Use only enough pressure to hold the tool in place,
When pressure is released, hammering stops.
6. When drilling deep holes, the speed may begin to
NOTE: Do not use water to settle the dust since
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 o and unplug the tool.
2. Free the bit from the workpiece.
3. Clear debris from the hole.
4. Begin drilling again.
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.
Core bits are useful for drilling larger holes for con-
duit 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
2. Push the guide plate onto the pointed end of the
7
Hammering with Rotation
ing Bits and Chisels").
straight handle).
the straight handle and trigger handle and maintain
control.
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.
drop o. Pull the bit partially out of the hole while
the tool is running to help clear dust.
it will clog the bit utes and tend to make the bit
bind in the hole.
To reduce the risk of injury, hold or
brace securely. Always be pre-
Use MILWAUKEE core bits Cat. No.
48-20-5125 through 48-20-5165. Do
Using Rotary Percussion Core Bits
and core bit to make later removal easier. Screw
the threaded end of the adapter into the rear of
the core bit.
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.
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.
4. Press the center pin rmly
against your center
mark, hold the tool
rmly and pull the trigger.
NOTE: If a center pin
and guide plate are not
available, use a template
or notched board to start
the hole.
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 five seconds
to loosen the core
bit from the adapter
shank.
NOTE: To make deep-
er 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 utes. Dust can clog
the bit utes 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 rmly
established in the cut
(about 1/4" deep), remove the bit from the
cut.
3. Remove the bit from
the tool.
4. Install a standard uted
bit, approximately 7/8"
in diameter, onto the
tool.
5.
Drill a perpendicular
hole through the kerf of
the large hole.
• Depending on the lo-
cation 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 cutting
ability of the bit.
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.
• 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.
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 de-
bris from the cut. Repeat
this for every inch of drill-
ing. If necessary, vacuum
dust and debris from the
cut and surrounding area.
Cut approximately
1/4" deep with a
core bit.
Drill a hole
through the
work.
Dust and debris will fall
through the hole.
Top view
Side view
of slab
Pull bit out as far as
possible once or twice
per inch drilled.
8
These MILWAUKEE Hammers may be used for
WARNING
WARNING
WARNING
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 o one small area at a
time rather than attempting too large an area.
A variety of accessories are available.
Chiseling and Chipping
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.
MAINTENANCE
To reduce the risk of injury, always
any maintenance. Never disassemble the tool.
Contact a MILWAUKEE service facility for ALL
repairs.
Keep your tool in good repair by adopting a regular
maintenance program. Inspect your tool for issues
such as undue noise, misalignment or binding of
moving parts, breakage of parts, or any other condi-
tion that may aect the tool operation. Return the tool
to a MILWAUKEE service facility for repair. After six
months to one year, depending on use, return the
tool to a MILWAUKEE service facility for inspection.
Through normal use, the shank of the chisel can
"mushroom" over and cause the chisel to become
stuck inside the hammer. To prevent this from happening, periodically remove the chisel from the tool
and inspect the shank. If the shank starts to "mushroom", have the chisel refurbished or replaced.
These MILWAUKEE hammers are will automatically
shut o when the brushes need to be replaced. Return your tool to the nearest MILWAUKEE service
facility for repairs.
These MILWAUKEE Hammers feature a service
indicator light. When the red light turns on, the tool is
in need of servicing. Return your tool to the nearest
MILWAUKEE service facility for service.
NOTE: When the service light comes on, the tool will
continue to run for a few hours and then the motor
will shut o.
unplug the tool before performing
Maintaining Tools
Maintaining Hammer Chisels
Brush Replacement
Service Indicator Light
To reduce the risk of personal in-
never immerse your tool in liquid or allow a liquid
to ow inside it.
Clean dust and debris from any vents. Keep tool
clean, dry and free of oil or grease. Use only mild
soap and a damp cloth to clean, since certain cleaning agents and solvents are harmful to plastics and
other insulated parts. Some of these include gasoline,
turpentine, lacquer thinner, paint thinner, chlorinated
cleaning solvents, ammonia and household deter-
gents containing ammonia. Never use ammable or
combustible solvents around tools.
For repairs, return the tool, battery pack and charger
to the nearest authorized service center.
jury, electric shock and damage,
Cleaning
Repairs
ACCESSORIES
Use only recommended accesso-
For a complete listing of accessories, go online to
www.milwaukeetool.com or contact a distributor.
ries. Others may be hazardous.
Thick Wall Carbide-Tipped Core Bits
Core Body with Guide Plate and Centering Pin
Cat. No. Diameter Drilling Depth
48-20-5125
48-20-5130
48-20-5135
48-20-5140
48-20-5145
48-20-5150
48-20-5155
48-20-5160
48-20-5165
NOTE: 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.
1-1/2"
1-3/4"
2"
2-1/2"
3"
3-1/2"
4"
5"
6"
4-1/16"
4-1/16"
4-1/16"
4-1/16"
4-1/16"
4-1/16"
4-1/16"
4-1/16"
4-1/16"
SERVICE - UNITED STATES
1-800-SAWDUST (1.800.729.3878)
Monday-Friday, 7:00 AM - 6:30 PM CST
or visit www.milwaukeetool.com
Contact Corporate After Sales Service Technical
Support with technical, service/repair, or warranty
questions.
Email: metproductsupport@milwaukeetool.com
Become a Heavy Duty Club Member at
www.milwaukeetool.com to receive important
notications regarding your tool purchases.
SERVICE - CANADA
Milwaukee Tool (Canada) Ltd
Monday-Friday, 7:00 AM - 4:30 PM CST
1.800.268.4015
or visit www.milwaukeetool.ca
9
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