Milwaukee 5268-21 User manual

TO REDUCE THE RISK OF INJURY, USER MUST READ AND UNDERSTAND OPERATOR'S
MANUAL.
OPERATOR'S MANUAL
1-1/8" SDS PLUS ROTARY HAMMER
Cat. No.
5268-21

23
PERSONAL SAFETY
GENERAL POWER TOOL SAFETY WARNINGS
WORK AREA SAFETY
ELECTRICAL SAFETY
POWER TOOL USE AND CARE
SERVICE
•Keep work area clean and well lit. Cluttered or
dark areas invite accidents.
•Do notoperatepowertoolsinexplosiveatmos-
pheres, such as in the presence of flammable
liquids, gases or dust. Powertoolscreate 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.
•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. Unmodified 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.Thereis an increased riskofelectric
shock if your body is earthed or grounded.
•Do notexposepower tools to rain orwet condi-
tions. Water entering a power tool will increase
the risk of electric shock.
•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.
•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 inter-
rupter (GFCI) protected supply. Useof an GFCI
reduces the risk of electric shock.
•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 influence of drugs, alcohol or medi-
cation. 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 dust mask, non-skid safety shoes, hard hat, or
hearingprotectionusedforappropriateconditions
will reduce personal injuries.
•Prevent unintentional starting. Ensure the
switch is in the off-position before connecting
to power source and/or battery pack, picking
up or carrying the tool. Carryingpowertools with
yourfingeronthe switch or energising power tools
that have the switch on invites accidents.
•Remove any adjusting key or wrench before
turning the power tool on. Awrench 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
jewellery. Keep your hair, clothing and gloves
away from moving parts. Loose clothes, jewel-
lery 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. Useof
dust collection can reduce dust-related hazards.
•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 notuse the power tool ifthe switch does not
turn it on and off. 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 the battery pack from the power tool
before making any adjustments, changing
accessories, or storing power tools. Such pre-
ventivesafetymeasuresreduce the risk of starting
the power tool accidentally.
•Store idle power tools out of the reach of chil-
dren and do not allow persons unfamiliar with
the power tool or these instructions to operate
the power tool. Powertools are dangerous in the
hands of untrained users.
•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. Manyaccidents
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, tak-
ing 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.
•Have your power tool serviced by a qualified
repair person using only identical replacement
parts. Thiswillensurethatthesafetyof the power
tool is maintained.
WARNING READ ALL SAFETY WARNINGS AND ALL INSTRUCTIONS. Failure to
followthe warnings and instructionsmayresult in electric shock,fire and/or seriousinjury. Save
allwarningsandinstructionsforfuturereference.The term “powertool” in the warn-
ingsrefers to your mains-operated (corded)power tool or battery-operated(cordless) power tool.
SPECIFIC SAFETY RULES
•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 tools by insulated gripping sur-
faces, when performing an operation where
the cutting tool may contact hidden wiring or
itsowncord. Cutting accessorycontactinga“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.
•Maintain labels and nameplates. These carry
important information. If unreadable or missing,
contact a MILWAUKEE service facility for a free
replacement.
•WARNING: Some dustcreatedbypower 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 andcementandother
masonry products, and
•arsenic and chromium from chemically-treated
lumber.
Your risk fromthese 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 dustmasksthat are spe-
cially designed to filter out microscopic particles.
1. Side handle
2. Depth gauge rod
3. Bit holder
4. Bit release collar
5. Mode selector knob
6. Trigger
FUNCTIONAL DESCRIPTION
3
1
5
6
4
2
Double Insulated
Volts
Alternating Current
Amps
No Load Revolutions per
Minute (RPM)
BPM Blows per Minute (BPM)
Anti-Vibration System
CUS Underwriters Laboratories, Inc.
United States and Canada
Mexican Approvals Marking
Tool Capacities
Cat. No. Volts AC A No Load RPM BPM Type Twist bit Core bit
5268-21 120 8 0 - 1500 0 - 5500 SDS Plus 1-1/8" 3"
SYMBOLOGY
SPECIFICATIONS

45
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
thesupplyoutlet increases, you must use a heavier
gauge extension cord. Using extension cords with
inadequately sized wire causes a serious drop in
voltage,resultinginlossofpowerandpossible tool
damage.Refertothetableshowntodeterminethe
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
cordtomakeup 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
sureit is marked withthesuffix “W-A”(“W” in Cana-
da)toindicatethat 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
qualified person before using it.
•Protect your extension cords from sharp objects,
excessive heat and damp or wet areas.
READ AND SAVE ALL
INSTRUCTIONS FOR FUTURE USE.
*Based onlimiting the linevoltage dropto five volts
at 150% of the rated amperes.
EXTENSION CORDS
Recommended Minimum Wire Gauge
For Extension Cords*
Nameplate Amps Extension Cord Length
25' 50' 75' 100' 150'
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
18
18
18
18
16
14
12
18
18
18
16
14
12
10
18
18
16
14
12
10
--
18
16
14
12
10
--
--
16
14
12
12
--
--
--
OPERATION
Selecting Action
MILWAUKEERotary Hammers have threesettings:
rotation only, rotary hammer, and hammer only.
Always allow the motor to come to a complete
stop before changing the mode selection to avoid
damage to the tool.
1. For rotation only, turn
the selector lever so the
arrowonthe lever points
tothetwist drill symbol.
2. For rotary hammering,
turn the selector lever
so the arrow points to
the hammer and twist
drill symbol.
3. For hammering only, turn the selector lever so
the arrow points to the hammer symbol.
4. To freely rotate the bit to the desired angle for
hammeringonly,turn the selector lever tothe
symbol. Then, follow step 3.
NOTE: To engage the hammering mechanism,
maintain pressure on the bit. When pressure on
the bit is released, the hammering action will stop.
Starting and Stopping
1. To start the tool, graspthehandlefirmlyandpull
the trigger.
2. To stop the tool, release the trigger. Make sure
the tool comes to a complete stop before laying
the tool down.
WARNING To reduce the risk of injury,
alwaysunplugtool 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,
wear safety goggles or glasses with side
shields.
WARNING To reduce the risk of injury,
keep hands and cord away from the bit and
all moving parts.
ASSEMBLY
Adjusting the Side Handle Position
1. Loosen the side handle by unscrewing the side
handle grip until the side handle rotates freely.
2. Rotate the side handle to the desired position.
3. Tighten the side handle grip securely.
Setting the Depth Gauge
1. Press in the clamping lever.
2. Slide the depth gauge rod back-
ward or forward until it is set for
the desired depth.
NOTE: The drilling depth is the
distancebetweenthetipofthe bit
andthe tip ofthedepthgauge rod.
3. Release the clamping lever.
Installing Bits and Chisels
NOTE: Only use accessories with SDS or SDS
Plus shanks.
Be sure that the shank of the bit is clean. Dirt par-
ticlesmaycause the bit tolineup improperly.Donot
use bits larger than the maximum recommended
capacity of the drill because gear damage or mo-
tor overloading may result. For best performance,
be sure that the bit is properly sharpened and the
shank is lightly greased before use. Use caution
when handling hot bits and chisels.
1. Unplug tool.
2. Insert the bit or chisel into the nose of the tool.
3. Push bit into tool until it locks.
4. Checktosee thatthebit islockedby tuggingonit.
5. To remove bits and chisels, pull back on the bit
release collar and remove bit.
WARNING To reduce the risk of injury,
always unplug tool before changing or re-
moving accessories. Only use accessories
specifically recommended forthis tool. Others
may be hazardous.
WARNING To reduce the risk of injury,
always use a sidehandle when using this tool.
Always brace or hold securely.
WARNING To reduce the risk of injury,
do not grasp the bit while the chuck is rotat-
ing or while the bit is falling from the chuck.
Drilling
Depth
Fig. B Fig. C
Fig. A
GROUNDING
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 FigureA). 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
groundingsysteminthetool.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 appropri-
ate 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
systemwhichsatisfiesOSHArequirementsandcom-
plieswiththeapplicablestandards of
Underwriters Laboratories, Inc.,the
CanadianStandardAssociationand
theNationalElectricalCode. Double
Insulatedtoolsmaybeusedineither
of the 120 volt outlets shown in
Figures B and C.
WARNING Improperly connecting the
grounding wire can result in the risk of elec-
tric shock. Check with a qualified 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
fit the outlet, have a proper outlet installed by
a qualified electrician.

67
Using the Control Switch
Alwaysallowthemotortocome to a complete stop
before using the control switch to avoid damage
to the tool.
Forforward (clockwise) rotation,pushinthe control
switch from the right side of the tool. Check the
direction of rotation before use.
Forreverse (counterclockwise) rotation,pushinthe
control switch from the left side of the tool. Check
direction of rotation before use.
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.
Too Little Correct Too much
force force force
Operator Force
The Anti-Vibration System provides the operator
with comfort without sacrificing power or perfor-
mance.
Idealoperator force compressesthebellowsslightly
and allows the tool to work aggressively while the
handle remains steady.
Excessive force compresses the bellows signifi-
cantlyandreducesvibration dampening. Users will
be able to feel the difference and should adjust the
force to the handle accordingly.
WARNINGApplying greater pressure
doesnotincreasethetool'seffectiveness.Ifthe
appliedworkingpressureistoohigh,theshock
absorber will be pushed together making the
vibrations to the handle noticeably stronger.
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. Pullthetriggerand apply force to the bit or chisel
against a concrete or wood surface for a few
seconds. Release the trigger
3. Repeatuntilthetool starts hammering.Thecold-
er 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
haveheat-treatedsteel 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
andcorebitto 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
holeinthe center of the
core bit.
For LHS systems,
screw the threaded
endofthecenteringbit
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 "ham-
mering with rotation"
setting.
4.Press the centering
bit firmly against your
center mark, hold the
tool firmly and pull the
trigger.
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 drilling to about the depth
of the core bit teeth, remove the center pin and
guide plate from the core bit (not necesary for
LHS system). Resume drilling.
Chiseling and Chipping
MILWAUKEE Rotary Hammers may be used for
chipping and chiseling.
When chiseling, hold the tool at an angle to the
workpiece.Workfrom 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
drilledholesinconcreteandmasonry.
Cut
approximately
1/4" deep with
a core bit.
Side view
of slab
Pull bit out as far
as possible once
or twice per inch
drilled.
Drill a hole
through the
work.
Dust and debris
will fall through
the hole.
Top view
6.To change the core bit, hold the tool upwards,
pointing it away from your body, and run it briefly
inforwardtoloosenthe core bit from the adapter.
NOTE:Tomake 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
whilethetoolis running, to help clear dust from the
bitflutes.Dustcanclog 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,
approximately7/8"in diameter,
onto the tool.
5.Drill a perpendicular hole
through the kerf of the large
hole.
• Depending on the location of
thework,the hole should either
breakthroughtheothersideof
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
therewhendrilling 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:Ifunable to drill ahole
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.Ifnecessary,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 re-
moved.
• 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.

8
ACCESSORIES
WARNINGTo reduce the risk of injury,
always unplug the tool before attaching or
removing accessories. Use only specifically
recommended accessories. Others may be
hazardous.
MAINTENANCE
Maintaining Tools
Keepyourtoolingoodrepair by adopting a regular
maintenance program. Before use, examine the
general condition of your tool. Inspect guards,
switches, tool cord set and extension cord for
damage. Check for loose screws, misalignment,
binding of moving parts, improper mounting, bro-
ken parts and any other condition that may affect
its safe operation. If abnormal noise or vibration
occurs, turn the tool off immediately and have the
problemcorrectedbeforefurtheruse.Donotuse a
damaged tool. Tag damaged tools “DO NOT USE”
until repaired (see “Repairs”).
Undernormalconditions, relubrication is notneces-
sary until the motor brushes need to be replaced.
After six months to one year, depending on use,
returnyourtool to the nearest MILWAUKEEservice
facility for the following:
• Lubrication
• Brush inspection and replacement
•Mechanical inspection and cleaning (gears,
spindles, bearings, housing, etc.)
• Electrical inspection (switch, cord, armature, etc.)
• Testing to assureproper mechanicaland electrical
operation
Cleaning
Clean dust and debris from vents. Keep the tool
handles clean, dry and free of oil or grease. Use
only mild soap and a damp cloth to clean your tool
since certain cleaning agents and solvents are
harmfultoplasticsandotherinsulatedparts. Some
oftheseinclude:gasoline,turpentine,lacquerthin-
ner, paint thinner, chlorinated cleaning solvents,
ammonia and household detergents containing
ammonia. Never use flammable or combustible
solvents around tools.
Repairs
If your tool is damaged, return the entire tool to the
nearest service center.
WARNINGTo reduce the risk of injury,
always unplug your tool before performing
any maintenance. Never disassemble the tool
or try to do any rewiring on the tool’s electrical
system.Contact a MILWAUKEE service facility
for ALL repairs.
WARNINGTo reduce the risk of injury,
electric shock and damage to the tool, never
immerse your tool in liquid or allow a liquid
to flow inside the tool.

Cat. No.
5268-21 SDS
PLUS
OPERATOR'S MANUAL
WARNING To reduce the risk of injury, user must read and understand operator's manual.
1-1/8" SDS PLUS ROTARY HAMMER

GENERAL POWER TOOL
SAFETY WARNINGS
WARNING
Read all safety warnings, instruc-
tions, illustrations and specica-
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) powertool orbattery-oper-
ated (cordless) power tool.
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
apowertool.Distractions can cause you to lose control.
ELECTRICAL SAFETY
•Powertoolplugsmustmatchtheoutlet.Nevermodify
thepluginanyway.Donotuseanyadapterplugswith
earthed (grounded) power tools. Unmodied 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.
•Donotexposepowertools torainorwetconditions.
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. Useofacord
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 inuence of drugs, alcohol or medication. A
momentof inattentionwhileoperatingpowertoolsmay
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
thepowertool on. Awrenchorakeyleftattachedtoa
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
extractionandcollectionfacilities,ensuretheseare
connectedandproperlyused.Useofdustcollection
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
•Donotforcethepowertool.Usethecorrectpowertool
foryour application.Thecorrectpowertoolwilldothe
job better and safer at the rate for which it was designed.
•Donot usethe powertool ifthe switchdoes notturn
it on and o󰀨. Any powertool that cannotbe 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,
changingaccessories, orstoringpower tools.Such
preventive safety measures reduce the risk of starting
the power tool accidentally.
•Storeidlepowertoolsoutofthereachofchildrenand
donot allowpersonsunfamiliar with thepowertool
ortheseinstructionstooperatethepowertool.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 a󰀨ect the
powertool’s operation.Ifdamaged, have thepower
tool repaired before use. Manyaccidentsarecaused
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 di󰀨erent
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 qualied repair
personusing onlyidenticalreplacement 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 mov-
ing parts.
•
WARNING
To reduce the risk of injury, wear a
dust mask or use an OSHA compli-
ant dust extraction solution when working in dusty
situations. Dust particles can harm your lungs.

•Maintain labels and nameplates. These carry
important information. If unreadable or missing, contact
a MILWAUKEE service facility for a free replacement.
•
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.
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.
SPECIFICATIONS
Cat. No...................................................... 5268-21
Volts .............................................................120 AC
Amps .....................................................................8
No Load RPM ............................................. 0 -1500
BPM ........................................................... 0 - 5500
Type ......................................................... SDS Plus
Capacities
Twist bit ......................................................1-1/8"
Core Bit............................................................ 3"
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.
Thesmallerthegaugenumberofthewire,thegreater
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 youare usingan extensioncord outdoors,be sure
it is marked with the su󰀩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
qualied 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*
Nameplate Amps Extension Cord Length
25' 50' 75' 100' 150'
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
18
18
18
18
16
14
12
18
18
18
16
14
12
10
18
18
16
14
12
10
--
18
16
14
12
10
--
--
16
14
12
12
--
--
--
* Based on limiting the line voltage drop to ve volts at 150%
of the rated amperes.
GROUNDING
WARNING
Improperlyconnecting the ground-
ing wire can result in the risk of
electric shock. Check with a qualied electrician
if you are in doubt as to whether the outlet is
properly grounded. Do not modify the plug pro-
vided 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 qualied 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 mal-
function or break down, grounding provides a low
resistance path to carry electricity away from the
user, reducing the risk of electric shock.
Thegroundingprongintheplugisconnected 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
systemand must neverbeattached toan electrically
“live” terminal.
Yourtoolmustbepluggedintoanappro-
Fig. A
priate outlet, properly installed and
groundedinaccordance withall 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 satises OSHA requirements and
complieswiththeapplicablestandards
Fig. B Fig. C
of Underwriters Laboratories, Inc., the
Canadian Standard Association and
the National Electrical Code. Double
Insulated tools may be used in either
ofthe120 volt outletsshown inFigures
B and C. SYMBOLOGY
Double Insulated
Volts
Alternating Current
Amps
NoLoadRevolutions per Minute(RPM)
BPM Blows per Minute Under Load (BPM)
Anti-Vibration System
CUS
UL Listing for Canada and U.S.
Approval Mark for Mexico

1. Unplug tool.
2. Insert the bit or chisel into the nose of the tool.
3. Push bit into tool until it locks.
4. Check to see that the bit is locked by tugging on it.
5. To remove bits and chisels, pull back on the bit
release collar and remove bit.
OPERATION
WARNING
To reduce the risk of injury, always
unplug tool before attaching or
removing accessories or making adjustments.
Use only specically recommended accessories.
Others may be hazardous.
To reduce the risk of injury, wear safety goggles
or glasses with side shields.
To reduce the risk of injury, wear a dust mask or
use an OSHAcompliant dust extraction solution
when working in dusty situations.
To reduce the risk of injury, keep hands and cord
away from the bit and all moving parts.
To reduce the risk of injury, always use a side
handle when using this tool. Always brace or
hold securely. Selecting Action
MILWAUKEE Rotary Hammers have three settings:
rotation only, rotary hammer, and hammer only.
Always allow the motor to come to a complete stop
before changing the mode selection to avoid dam-
age to the tool.
1. For rotation only, turn the
selectorlever sothearrow
on the lever points to the
twist drill symbol.
2. For rotary hammering, turn
theselectorleversothear-
row points to the hammer
and twist drill symbol.
3. For hammering only, turn
the selector lever so the arrow points to the ham-
mer symbol.
4. To freely rotate the bit to the desired angle for
hammering only, turn the selector lever to the
symbol. Then, follow step 3.
NOTE:Toengagethehammering mechanism, main-
tain pressure on the bit. When pressure on the bit is
released, the hammering action will stop.
Starting and Stopping
1. To start the tool, grasp the handle 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.
WARNING
Applyinggreater pressuredoesnot
increase the tool's e󰀨ectiveness.
If the applied working pressure is too high, the
shock absorber will be pushed together making
the vibrations to the handle noticeably stronger.
Operator Force
TheAnti-VibrationSystemprovidesthe operatorwith
comfort without sacricing power or performance.
Ideal operator force compresses the bellows slightly
and allows the tool to work aggressively while the
handle remains steady.
Excessive force compresses the bellows signicantly
and reduces vibration dampening. Users will be able
to feel the di󰀨erence and should adjust the force to
the handle accordingly.
FUNCTIONAL DESCRIPTION
1. Side handle
2. Depth gauge rod
3. Bit holder
4. Bit release collar
3
1
5
4
2
5. Mode selector knob
6. Control switch
7. Trigger
8. Handle
7
6
8
ASSEMBLY
WARNING
To reduce the risk of injury, always
unplug tool before changing or
removing accessories. Only use accessories
specically recommended for this tool. Others
may be hazardous.
To reduce the risk of injury, always use a side
handle when using this tool. Always brace or
hold securely.
Adjusting the Side Handle Position
1. Loosen the side handle by unscrewing the side
handle grip until the side handle rotates freely.
2. Rotate the side handle to the desired position.
3. Tighten the side handle grip securely.
Setting the Depth Gauge
1. Press in the clamping lever.
2. Slide the depth gauge rod backward Drilling
Depth
or forward until it is set for the de-
sired depth.
NOTE: The drilling depth is the
distance between the tip of the bit
and the tip of the depth gauge rod.
3. Release the clamping lever.
WARNING
To reduce the risk of
injury, do not grasp
the bit while the chuck is rotating
or while the bit is falling from the
chuck. Installing Bits and Chisels
NOTE: Only use accessories with SDS or SDS Plus
shanks.
Be sure that the shank of the bit is clean. Dirt particles
may cause the bit to line up improperly. Do not use
bitslargerthanthemaximum recommended capacity
of the drill because gear damage or motor overload-
ing may result. For best performance, be sure that
the bit is properly sharpened and the shank is lightly
greased before use. Use caution when handling hot
bits and chisels.

Too Little Correct Too much
force force force
Using the Control Switch
Always allow the motor to come to a complete stop
before using the control switch to avoid damage to
the tool.
For forward (clockwise) rotation, push in the control
switch from the right side of the tool. Check the direc-
tion of rotation before use.
For reverse (counterclockwise) rotation, push in the
control switch from the left side of the tool. Check
direction of rotation before use.
Operating
Position the tool, grasp the handles rmly 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 o󰀨 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 utes 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
intotheholein the center
of the core bit.
For LHS systems, screw
the threaded end of the
centeringbitintothecore
bit.
NOTE: If using an ex-
tension, rst thread the
adapter shank to the
extension. Then thread
the core bit to the exten-
sion.
3. Insert the adapter into the
nose of the tool as de-
scribed in “Installing Bits
and Chisels”. Set the
knob to the "hammering
with rotation" setting.
4. Press the centering bit
rmly against your center
mark, hold the tool rmly
and pull the trigger.
NOTE: If the 48-20-5099
threadedstud isused, 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, re-
move the center pin and
guideplate from thecore
bit (not necesary for LHS system). Resume drilling.
6. To change the core bit, hold the tool upwards,
pointing it away from your body, and run it briey
in forward to loosen the core bit from the adapter.
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
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.
DrillingLargeDiameter Holeswith CoreBits
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. Cut
approximately
1/4" deep with
a core bit.
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, ap-
proximately 7/8" in diameter,
onto the tool.
5. Drill a perpendicular hole through
Drill a hole
through the
work.
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).