Milwaukee 5381-20 User Manual
OPERATOR'S MANUAL
MANUEL de L'UTILISATEUR
MANUAL del OPERADOR
Catalog No.
No de Cat.
Catálogo No.
5381-20
5387-20
1/2" HAMMER-DRILL
PERCEUSES À PERCUSSION 13 mm (1/2")
13 mm (1/2") TALADRO-MARTILLO
TO REDUCE THE RISK OF INJURY, USER MUST READ AND UNDERSTAND OPERATOR'S MANUAL.
AFIN DE RÉDUIRE LE RISQUE DE BLESSURES, L'UTILISATEUR DOIT LIRE ET BIEN COMPRENDRE LE
MANUEL DE L'UTILISATEUR.
PARA REDUCIR EL RIESGO DE LESIONES, EL USUARIO DEBE LEER Y ENTENDER EL MANUAL DEL
OPERADOR.
GENERAL SAFETY RULES FOR ALL POWER TOOLS
WARNING!
Failure to follow all instructions listed below may result in electric shock, fire 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 flammable 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. Unmodified 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 suitable for outdoor use. Use of a cord suitable for outdoor
use reduces the risk of electric shock.
PERSONAL SAFETY
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. An 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 bat-
tery 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 allow persons unfamiliar with the power tools or these
instructions to operate power tools. Power tools are danger-
ous 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 accor-
dance 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.
POWER TOOL USE AND CARE
SERVICE
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 influence 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
equipment 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 finger 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 extrac-
tion and collection facilities, ensure these are connected
and properly used. Use of these devices can reduce dust-re-
lated hazards.
page 2
23. Have your power tool serviced by a qualified repair person
using only identical replacement parts. This will ensure that
the safety of the power tool is maintained.
SPECIFIC SAFETY RULES
1. Maintain labels and nameplates. These carry important information. If unreadable or missing, contact a MILWAUKEE service facility for a free
replacement.
2. 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 filter out microscopic
particles.
3. Hold tool 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.
4. Keep hands away from all cutting edges and moving parts.
5. Wear ear protectors with impact drill. Exposure to noise can cause hearing loss.
6. Use auxiliary handles supplied with the tool. Loss of control can cause personal injury.
Symbology
Double Insulated
Alternating Current
Amps
No Load Revolutions per
Minute (RPM)
BPM
1. Side handle
2. Clamping lever
3. Depth guage
4. Hammer/Drill lever
5. Variable speed trigger
6. Forward/Reverse lever
7. Speed/Torque selector (Cat. No. 5387-20 only)
8. Chuck
9. Quik-Lok® cord (Cat. No. 5387-20 only)
3
4
Blows per Minute (BPM)
Underwriters Laboratories, Inc.,
United States and Canada
Mexican Approvals Marking
2
Tool
Cat.
No.
5387-20
5381-20
Volts
AC
120
120
8.5
8.5
No Load
A
Low 0 - 1000
High 0 - 2500
0 - 1800
RPM
FUNCTIONAL DESCRIPTION
8
7
Specifications
No Load
Blows per
Minute
16,000
40,000
28,000
6
Drill Only
(steel/wood)
Twist
Drill
Bit
1/2" / 1"
3/8" / 3/4"
Cat. No. 5387-20
5
Capacities
Rotary Hammer
(concrete)
Carbide Tipped
Percussion
Bit
3/4"
5/8"
1
9
page 3
GROUNDING EXTENSION CORDS
WARNING!
Improperly connecting the grounding wire can result in the
risk of electric 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.
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.
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:
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
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 suffix 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 qualified 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 five
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.
TOOL ASSEMBLY
WARNING!
To reduce the risk of injury, always unplug tool before
attaching or removing accessories or making adjustments.
Use only specifically recommended accessories. Others
may be hazardous.
Removing and Replacing Quik-Lok® Cords (Fig. 1) (Cat. No. 5387-20)
MILWAUKEE's exclusive Quik-Lok® Cords provide instant field
replacement or substitution.
page 4
Fig. 1
1. To remove the Quik-Lok® Cord, turn the cord nut 1/4 turn to the left
and pull it out.
2. To replace the Quik-Lok® Cord, align the connector keyways and
push the connector in as far as it will go. Turn the cord nut 1/4 turn
to the right to lock.
WARNING!
To prevent personal injury, always remove the chuck key
from the chuck after each use.
Installing Bits into Keyed Chucks (Fig. 2)
Be sure that the shank of the bit and the chuck jaws are clean. Dirt
particles may cause the bit to line up improperly. Do not use bits larger
than the maximum recommended capacity of the drill because gear damage or motor overloading may result. For best performance, be sure that
the bits are properly sharpened before use.
Fig. 2
Loosen
Tighten
Setting the Depth Gauge (Fig. 4)
Fig. 4
Drilling Depth
1. Press in the clamping lever (Fig. 3).
2. Slide the depth gauge rod backward or forward until it is set
for the desired depth (Fig. 4).
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!
1. Unplug the tool.
2. Open the chuck jaws wide enough to insert a bit. Allow the bit to
strike the bottom of the chuck. Center the bit in the chuck jaws and
tighten the jaws by hand to align the bit.
3. Place the chuck key into each of the three holes in the chuck, turning
it clockwise to tighten the chuck securely.
NOTE: Never use a wrench or means other than a chuck key to tighten
or loosen the chuck.
4. To remove the bit, insert the chuck key into one of the holes in the
chuck and turn it counterclockwise.
WARNING!
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 (Fig. 3)
Fig. 3
Clamping lever
Side handle
grip
To reduce the risk of injury, always wear eye protection.
Chuck Removal (Fig. 5)
This tool is equipped with a threaded spindle to hold the chuck. Before
removing the chuck, unplug the tool and open the chuck jaws. A lefthanded thread screw is located inside the chuck to prevent the chuck
from loosening when the tool is operated in reverse direction. Remove
the screw by turning it clockwise. To remove the chuck, hold the tool so
that only the side of the chuck rests firmly and squarely on a solid
workbench. Insert the chuck key or a chuck remover bar in one of the
keyholes. Turn the chuck so the key is at about a 30° angle to the bench
top and strike the key sharply with a hammer so the chuck turns in a
counterclockwise direction (looking from the front of the tool). This should
loosen the chuck from the spindle which has a right hand thread making
it easy to remove the chuck by hand.
NOTE: When replacing the chuck, always replace the left hand thread
screw in the chuck.
Fig. 5
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.
page 5
OPERATION
APPLICATIONS
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 Action
MILWAUKEE Hammer-Drills have two settings: drilling and
hammer-drilling.
1. For drilling, turn the hammer-drill lever to the drill symbol .
2. For hammer-drilling, turn the hammer-drill lever to the
hammer symbol .
NOTE: To engage the hammering mechanism, maintain pressure on
the bit. When pressure on the bit is released, the hammering action
will stop.
Using Forward/Reverse Lever (Fig. 6)
The forward/reverse lever can only be adjusted when the trigger is not
pressed. Always allow the motor to come to a complete stop before
using the forward/reverse lever.
Fig. 6
Forward
WARNING!
To reduce the risk of electric shock, check work area for
hidden pipes and wires before drilling.
Drilling in Wood, Composition Materials and Plastic
When drilling in wood, composition materials and plastic, select the drill
operating mode. Start the drill slowly, gradually increasing speed as you
drill. Select low speeds for plastics with a low melting point.
Drilling in Metal
When drilling in metal, select the drill operating mode. Use high speed
steel twist drills or hole saws. Use a center punch to start the hole.
Lubricate drill bits with cutting oil when drilling in iron or steel. Use a
coolant when drilling in nonferrous metals such as copper, brass or
aluminum. Back the material to prevent binding and distortion on breakthrough.
Drilling in Masonry
When drilling in masonry, select the hammer-drill operating mode. Use
high speed carbide-tipped bits. Drilling soft masonry materials such as
cinder block requires little pressure. Hard materials like concrete require
more pressure. A smooth, even flow of dust indicates the proper drilling
rate. Do not let the bit spin in the hole without cutting. Do not use water
to settle dust or to cool bit. Do not attempt to drill through steel reinforcing
rods. Both actions will damage the carbide.
Reverse
1. For forward (clockwise) rotation, push the forward/reverse lever
to the left (when viewed from the back of the tool) as shown.
2. For reverse (counterclockwise) rotation, push the forward/reverse
lever to the right (when viewed from the back of the tool) as shown.
Allow the motor to come to a full stop before reversing.
NOTE: When hammer-drilling, use the tool in forward rotation (clockwise) only.
Selecting Speed (Cat. No. 5387-20 only)
The speed can only be changed when the tool is at a complete stop.
1. For high torque/low speed (up to 1000 rpm), turn the speed
selector to position 1.
2. For low torque/high speed (up to 2500 rpm), turn the speed
selector to position 2.
Starting, Stopping & Controlling Speed
1. To start the tool, pull trigger.
2. To stop the tool, release trigger.
3. To vary the speed, increase or decrease pressure to trigger. The
further the trigger is pulled, the greater the speed.
Operating
Position the tool, grasp the handles firmly and pull the trigger. Always
hold or brace the tool securely using both handles and 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 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.
page 6
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