NEC V28 0799-20 User Manual
Cat. No.
No de cat.
Cat. No.
0779-20
0799-20
OPERATOR'S MANUAL
MANUEL de L'UTILISATEUR
MANUAL del OPERADOR
IMPACT WRENCH
CLÉ À PERCUSSION
LLAVE DE IMPACTO DE
TO REDUCE THE RISK OF INJURY, USER MUST READ OPERATOR'S MANUAL.
AFIN DE RÉDUIRE LE RISQUE DE BLESSURES, L'UTILISATEUR DOIT LIRE LE
MANUEL DE L'UTILISATEUR.
PARA REDUCIR EL RIESGO DE LESIONES, EL USUARIO DEBE LEER EL MANUAL
DEL OPERADOR.
GENERAL SAFETY RULES-FOR ALL BATTERY OPERATED TOOLS
WARNING
READ ALL INSTRUCTIONS
Failure to follow all instructions listed below may result in electric shock, fi re and/or
serious injury. The term "power tool" in all of the warnings listed below refers to your
mains-operated (corded) power tool or battery-operated (cordless) power tool.
SAVE THESE 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 ex-
plosive atmospheres, such as in the
presence of fl ammable liquids, gases
or dust. Power tools create sparks which
may ignite the dust or fumes.
3. Keep children and bystanders away
while operating a power tool. Distractions can cause you to lose control.
ELECTRICAL SAFETY
4. Power tool plugs must match the
outlet. Never modify the plug in any
way. Do not use any adapter plugs
with earthed (grounded) power tools.
Unmodifi ed plugs and matching outlets
will reduce risk of electric shock.
5. Avoid body contact with earthed or
grounded surfaces such as pipes,
radiators, ranges and refrigerators.
There is an increased risk of electric shock
if your body is earthed or grounded.
6. Do not expose power tools to rain or
wet conditions. Water entering a power
tool will increase the risk of electric
shock.
7. Do not abuse the cord. Never use the
cord for carrying, pulling or unplugging the power tool. Keep cord away
from heat, oil, sharp edges or moving
parts. Damaged or entangled cords
increase the risk of electric shock.
8. When operating a power tool out-
doors, use an extension cord suitable
for outdoor use. Use of a cord suitable
for outdoor use reduces the risk of electric shock.
2 3
PERSONAL SAFETY
9. Stay alert, watch what you are do-
ing and use common sense when
operating a power tool. Do not use
a power tool while you are tired or
under the infl uence of drugs, alcohol
or medication. A moment of inattention
while operating power tools may result
in serious personal injury.
10. Use safety equipment. Always wear
eye protection. Safety 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 power tools with
your fi nger on the switch or plugging in
power tools that have the switch on invites
accidents.
12. Remove any adjusting key or wrench
before turning the power tool on. A
wrench or a key left attached to a rotating part of the power tool may result in
personal injury.
13. Do not overreach. Keep proper foot-
ing 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 connec-
tion of dust extraction and collection
facilities, ensure these are connected
and properly used. Use of these de-
vices can reduce dust-related hazards.
POWER TOOL USE AND CARE
16. Do not force the power tool. Use the
correct power tool for your application. The correct power tool will do the
job better and safer at the rate for which
it was designed.
17. Do not use the power tool if the switch
does not turn it on and off. Any power tool
that cannot be controlled with the switch is
dangerous and must be repaired.
18. Disconnect the plug from the power
source and/or the battery pack from
the power tool before making any
adjustments, changing accessories,
or storing power tools. Such preven-
tive safety measures reduce the risk of
starting the power tool accidentally.
19. 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 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 accordance with
these instructions and in the manner
intended for the particular type of
power tool, taking into account the
working conditions and the work to
be performed. Use of the power tool for
operations different from those intended
could result in a hazardous situation.
BA TTER Y T OOL USE AND CARE
23. Ensure the switch is in the off position before inserting battery pack.
Inserting the battery pack into power
tools that have the switch on invites
accidents.
24. Recharge only with the charger speci-
fi ed by the manufacturer. A charger
that is suitable for one type of battery
pack may create a risk of fi re when used
with another battery pack.
25. Use power tools only with specifi cally
designated battery packs. Use of any
other battery packs may create a risk of
injury and fi re.
26. When battery pack is not in use, keep
it away from other metal objects like
paper clips, coins, keys, nails, screws,
or other small metal objects that can
make a connection from one terminal
to another. Shorting the battery terminals
together may cause burns or a fi re.
27. Under abusive conditions, liquid may
be ejected from the battery, avoid
contact. If contact accidentally occurs, fl ush with water. If liquid con-
tacts eyes, additionally seek medical
help. Liquid ejected from the battery
may cause irritation or burns.
SERVICE
28. Have your power tool serviced by a
qualifi ed repair person using only
identical replacement parts. This will
ensure that the safety of the power tool
is maintained.
SPECIFIC SAFETY RULES
1. Hold power tools by insulated gripping surfaces when performing an
operation where the cutting tool may
contact hidden wiring or its own cord.
Contact with a “live” wire will make exposed metal parts of the tool “live” and
shock the operator.
2. Maintain labels and nameplates. These
carry important information. If unreadable or missing, contact a MILWAUKEE
service facility for a free replacement.
3. WARNING! Some dust created by power
sanding, sawing, grinding, drilling, and
other construction activities contains
chemicals known to cause cancer, birth
defects or other reproductive harm. Some
examples of these chemicals are:
• lead from lead-based paint
• crystalline silica from bricks and cement
and other masonry products, and
• arsenic and chromium from chemicallytreated 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
fi lter out microscopic particles.
FUNCTIONAL DESCRIPTION
TOOL ASSEMBLY
1. 1/2" drive shank
2. Forward/Reverse switch
3. Trigger
4. Battery pack
5. Battery pack release buttons
6. Tool hanger
7. Tool hanger ring
8. 7/16" hex quick-change chuck
8
Cat. No. 0799-20
Volts
DC
28
28
No Load
RPM
0 - 1450
0 - 1450
Cat.
No.
0779-20
0799-20
7
1
2
3
4
Specifi cations
Drive
Shank
1/2"
7/16" Hex
Impacts
Per
Minute
0 - 2450
0 - 2450
6
Cat. No. 0779-20
Average
Torque
Output*
325 ft-lbs.*
325 ft-lbs.*
WARNING
Always lock trigger or remove battery
pack before changing or removing
accessories. Only use accessories
specifi cally recommended for this
tool. Others may be hazardous.
Removing Battery Pack from Tool
Push in the release buttons and pull the battery pack away from the tool.
Inserting Battery Pack into Tool
T o insert the battery pack onto the tool, slide
5
the pack onto the body of the tool. Make sure
it latches securely into place.
1. For working in restricted spaces.
Insert the battery pack from the front
by pressing in the release buttons and
sliding battery pack into the body of the
tool. Insert the battery pack until clamp
engages.
2. For optimum weight distribution and
balance. Insert the battery pack from
the back by pressing in the release buttons and sliding the battery pack into the
body of the tool. Insert the battery pack
until clamp engages.
Attaching and Removing the Tool Hanger
Fig. 1
Gear
case
screws
1. To attach, remove the two top gear case
screws (Fig. 1).
2. Place the ring through the tool hanger.
3. Position the tool hanger on the tool over
the two gear case screw holes.
4. Replace the two gear case screws.
Hand tighten the screws.
5. To remove, reverse the procedure.
Ring
Tool
hanger
WARNING
Use only sockets and other
accessories specifi cally designed for
use on impact wrenches and drivers.
Other sockets and accessories might
shatter or break causing injury.
* Output rated at full speed
Drilling Capacities
Cat. No.
0779-20
0799-20
Quick Change Auger Bits
Selfeed Bits
1-1/2"
1-1/2"
2-9/16"
2-9/16"
Symbology
Volts Direct Current
Impacts per Minute Under
Load (IPM)
Underwriters Laboratories, Inc.,
United States and Canada
4 5
Attaching and Removing Accessories
(Cat. No. 0779-20)
This impact wrench is intended only for use
with sockets designed for impact wrenches
and that have a 1/2" square drive. Other
sockets could shatter or break, causing
injury.
Fig. 2
Drive shank
Detent pin
1. To attach a socket or other accessory,
align the hole in the accessory with
the detent pin on the drive shank.
Hold the detent pin in while pushing
the socket onto the drive shank. The
detent pin will snap into place in the hole
to secure the socket.
2. To remove the accessory, insert a nail
or other thin object into the hole in the
accessory and press the detent pin in.
Pull the accessory off the drive shank.
Attaching and Removing Accessories
(Cat. No. 0799-20, or other Impact Wrenches
using the Quick Change 1/2” Square Drive
to 7/16” Hex Adapter)
Cat. No. 0799-20 and accessory Cat. No.
48-66-0061 are intended for use with drill
bits and adapters with a 7/16” Hex Quick.
The Quick Change shank has a ball-retainer
groove. It is not intended for use with Hex
Shank Bit Extensions.
Fig. 3
Ball retainer
groove
1. To attach an accessory, pull the chuck
collar forward and insert the accessory
shank. Release the collar. It may be
necessary to pull the bit out slightly to
engage the holding mechanism.
2. To remove the accessory , pull the chuck
collar forward and remove the accessory. Release the collar.
Open (Release)
Closed (Locked)
OPERATION
WARNING
To reduce the risk of injury, keep
hands away from the bit and all moving parts. Always wear safety goggles
or glasses with side shields.
Using the Forward/Reverse Switch
The forward/reverse switch may be set to
three positions: forward, reverse and lock.
Due to a lockout mechanism, the forward/
reverse switch can only be adjusted when
the trigger is not depressed. Always allow the motor to come to a complete stop
before using the forward/reverse switch.
Fig. 4
Forward
Forward/
Reverse
switch
Reverse
1. For forward (clockwise) rotation,
push the forward/reverse switch
in the direction shown. Check the
direction of rotation before use.
2. For reverse (counterclockwise)
rotation, push the forward/reverse
switch in the direction shown. Check the
direction of rotation before use.
3. To lock the trigger, push the forward/
reverse switch to the center position.
The trigger will not work when the
forward/reverse switch is in the
locked position. Always lock the
trigger or remove the battery pack
before performing maintenance, changing accessories, storing the tool and any
time the tool is not in use.
WARNING
To reduce the risk of explosion,
electric shock and property
damage, always check the work area
for hidden pipes and wires before
drilling.
WARNING
To reduce the risk of injury, only
grasp tool by handle and red
insulated surfaces (Fig. 5). Do
not hold gray gear case when
impacting or drilling.
Fig. 5
Starting, Stopping and Controlling
Speed
This impact wrench may be operated at any
speed from 0 to full speed.
1. To start the tool, grasp the handle fi rmly
and pull the trigger.
2. To vary the speed, increase or
decrease the pressure on the trigger.
The further the trigger is pulled, the
greater the speed.
3. To stop the tool, release the trigger.
Electric Brake
The electric brake engages when the
trigger is released, causing the socket
to stop and allowing you to proceed with
your work. Generally, the socket stops
within two seconds. However, there may
be a delay between the time you release
the trigger and when the brake engages.
Occasionally the brake may miss completely.
If the brake misses frequently, the impact
wrench needs servicing by an authorized
MILWAUKEE service facility.
Impacting Techniques
The longer a bolt, screw, or nut is impacted,
the tighter it will become. To help prevent
damaging the fasteners or workpieces,
avoid excessive impacting. Be particularly
careful when impacting smaller fasteners
because they require less impacting to reach
optimum torque.
Practice with various fasteners, noting the
length of time required to reach the desired
torque. Check the tightness with a handtorque wrench. If the fasteners are too tight,
reduce the impacting time. If they are not
tight enough, increase the impacting time.
Impacting for two seconds is generally
suffi cient for a 3/8" bolt and one second
for a 5/16" bolt. However, oil, dirt, rust or
other matter on the threads or under the
head of the fastener affects the degree of
tightness.
The torque required to loosen a fastener
averages 75% to 80% of the tightening
torque, depending on the condition of the
contacting surfaces. However, if rust or
corrosion causes seizing, more torque may
be required.
On light gasket jobs, run each fastener down
to a relatively light torque and use a hand
torque wrench for fi nal tightening.
6 7
MAINTENANCE
FIVE YEAR TOOL LIMITED WARRANTY
WARNING
To reduce the risk of injury,
always unplug the charger and
remove the battery pack from
the charger or tool before
performing any maintenance.
Never disassemble the tool,
battery pack or charger. Contact a
MILWAUKEE service facility for ALL
repairs.
Keep your tool, battery pack and charger in good repair by adopting a regular
maintenance program. After six months
to one year, depending on use, return the
tool, battery pack and charger to a
MILWAUKEE service facility for:
• Lubrication
• Mechanical inspection and cleaning
(gears, spindles, bearings, housing,
etc.)
• Electrical inspection (battery pack,
charger, motor)
• T esting to assure proper mechanical and
electrical operation
Maintaining Tool
If the tool does not start or operate at full power with a fully charged battery pack, clean
the contacts on the battery pack. If the tool
still does not work properly, return the tool,
charger and battery pack, to a MILWAUKEE
service facility for repairs.
WARNING
To reduce the risk of personal injury
and damage, never immerse your
tool, battery pack or charger in liquid
or allow a liquid to fl ow inside them.
Cleaning
Clean dust and debris from charger and tool
vents. Keep tool handles clean, dry and free
of oil or grease. Use only mild soap and a
damp cloth to clean the tool, battery pack
and charger 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 detergents containing ammonia.
Never use fl ammable or combustible sol-
vents around tools.
Repairs
For repairs, return the tool, battery pack and
charger to the nearest service center listed on
the back cover of this operator's manual.
ACCESSORIES
WARNING
Always remove battery pack before
changing or removing accessories.
Only use accessories specifi cally
recommended for this tool. Others
may be hazardous.
For a complete listing of accessories refer to
your MILWAUKEE Electric Tool catalog or go
on-line to www.milwaukeetool.com. To obtain
a catalog, contact your local distributor or a
service center listed on the back cover of this
operator’s manual.
Every MILWAUKEE electric power tool (including battery charger) is warranted to the original
purchaser only to be free from defects in material and workmanship. Subject to certain exceptions, MILWAUKEE will repair or replace any part on a electric power tool which, after examina-
tion, is determined by MILWAUKEE to be defective in material or workmanship for a period of
fi ve (5) years* after the date of purchase. Return the electric power tool and a copy of proof
of purchase to a MILWAUKEE factory Service/Sales Support Branch location or MILWAUKEE
Authorized Service Station, freight prepaid and insured, are requested for this warranty to be
effective. This warranty does not apply to damage that MILWAUKEE determines to be from
repairs made or attempted by anyone other than MILWAUKEE authorized personnel, misuse,
alterations, abuse, normal wear and tear, lack of maintenance, or accidents.
* The warranty period for Hoists (lever, hand chain, & electric chain hoists), all Ni-CD battery
packs, Work Lights (cordless fl ashlights), Job Site Radios, and Trade T itan™ Industrial W ork
Carts is one (1) year from the date of purchase. *The warranty period for Li-Ion battery packs
that do not contain V™-technology – 4.0 volts through 18.0 volts - is two (2) years from the
date of purchase.
*There is a separate warranty for V™-technology Li-Ion Battery Packs V™18 volts and above
that accompany V™-technology cordless power tools:
*Every MILWAUKEE V™-technology Li-Ion Battery Pack 18 volts or above is covered by an
initial 1000 Charges/2 Years free replacement warranty. This means that for the earlier of
the fi rst 1000 charges or two (2) years from the date of purchase/fi rst charge, a replacement
battery will be provided to the customer for any defective battery free of charge. Thereafter,
customers will also receive an additional warranty on a pro rata basis up to the earlier of the
fi rst 2000 charges or fi ve (5) Years from the date of purchase/fi rst charge. This means that
every customer gets an additional 1000 charges or three (3) years of pro rata warranty on
the V™-technology Li-Ion Battery Pack 18 volts or above depending upon the amount of use.
During this additional warranty period, the customer pays for only the useable service received
over and above the fi rst 1000 Charges/2 years, based on the date of fi rst charge and number
of charges found on the battery pack via Milwaukee’s V™-technology Service Reader.
Warranty Registration is not necessary to obtain the applicable warranty on a MILWAUKEE
product. However, proof of purchase in the form of a sales receipt or other information deemed
suffi cient by MILWAUKEE, is requested.
ACCEPTANCE OF THE EXCLUSIVE REPAIR AND REPLACEMENT REMEDIES DESCRIBED HEREIN IS A CONDITION OF THE CONTRACT FOR THE PURCHASE OF
EVERY MILWAUKEE PRODUCT. IF YOU DO NOT AGREE TO THIS CONDITION, YOU
SHOULD NOT PURCHASE THE PRODUCT. IN NO EVENT SHALL MILWAUKEE BE LIABLE FOR ANY INCIDENTAL, SPECIAL, CONSEQUENTIAL OR PUNITIVE DAMAGES,
OR FOR ANY COSTS, ATTORNEY FEES, EXPENSES, LOSSES OR DELAYS ALLEGED
TO BE AS A CONSEQUENCE OF ANY DAMAGE TO, FAILURE OF, OR DEFECT IN ANY
PRODUCT INCLUDING, BUT NOT LIMITED TO, ANY CLAIMS FOR LOSS OF PROFITS.
THIS WARRANTY IS EXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES OR CONDITIONS, WRITTEN OR ORAL, EXPRESSED OR IMPLIED. WITHOUT LIMITING THE
GENERALITY OF THE FOREGOING, MILWAUKEE DISCLAIMS ANY IMPLIED W ARRANTY
OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE OR PURPOSE, AND ALL
OTHER WARRANTIES.
This warranty applies to product sold in the U.S.A., Canada and Mexico only.
8 9
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