Snapper 0799-20, 0779-20 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

POWER TOOL USE AND CARE

BATTERY TOOL USE AND CARE

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.

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 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.

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 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 dangerous in the

hands of untrained users.

20. Maintain power tools. Check for

misalignment or binding of moving
parts, breakage of parts and any
other condition that may affect the
power tool's operation. If damaged,
have the power tool repaired before
use. Many accidents are caused by

poorly maintained power tools.

21. Keep cutting tools sharp and clean.
Properly maintained cutting tools with
sharp cutting edges are less likely to
bind and are easier to control.

22. Use the power tool, accessories and

tool bits etc., in accordance with
these instructions and in the manner
intended for the particular type of
power tool, taking into account the
working conditions and the work to
be performed. Use of the power tool for

operations different from those intended
could result in a hazardous situation.

23. Ensure the switch is in the off posi-

tion 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.

2 3

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 chemically-treated lumber.

Y our risk from these exposures varies, depending on how often you do this type of work.

To reduce your exposure to these chemicals: work in a well ventilated area, and work
with approved safety equipment, such as those dust masks that are specially designed
to fi lter out microscopic particles.

FUNCTIONAL DESCRIPTION

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

7

6

Cat. No. 0779-20

1

2

3

Symbology

Volts Direct Current

Impacts per Minute Under
Load (IPM)

Underwriters Laboratories,
Inc., United States and
Canada

8

Cat. No. 0799-20

Volts

Cat.

No.

0779-20
0799-20

* Output rated at full speed

Cat. No.

0779-20
0799-20

No Load

DC

RPM

28

0 - 1450

28

0 - 1450

Quick Change Auger Bits

4

Specifi cations

Drive

Shank

1/2"

7/16" Hex

Impacts

0 - 2450
0 - 2450

Drilling Capacities

1-1/2"
1-1/2"

Per

Minute

5

Average

Torque

Output*

325 ft-lbs.*
325 ft-lbs.*

Selfeed Bits

2-9/16"
2-9/16"

4 5

TOOL ASSEMBLY

WARNING

Charge only V28™ Lithium-Ion
battery packs on V28™ Lithium­Ion chargers. Other brands of
batteries may cause personal
injury or damage.

For specifi c charging instructions,
please read the operator's manual
supplied with your charger.

Removing Battery Pack from Tool

Push in the release buttons and pull the bat­tery pack away from the tool.

Inserting Battery Pack into Tool

The battery pack can be inserted into the
tool in two ways. To insert the battery pack
onto the tool, slide the pack onto the body
of the tool. Make sure it latches securely
into place.

Fig. 1

For working in re­stricted spaces, insert
the battery pack from
the front of the tool.

Fig. 2

For optimum weight
distribution and bal­ance, insert the battery
pack from the back of
the tool.

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.

Attaching and Removing the Tool Hanger

Fig. 3

Gear
case
screws

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.

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. 4

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.

1. To attach an accessory, pull the chuck
collar forward and insert the accessory
shank. Release the collar. It may be

Fig. 5

Ball retainer
groove

necessary to pull the bit out slightly to
engage the holding mechanism.

2. T o remove the accessory , pull the chuck
collar forward and remove the acces­sory. Release the collar.

Open (Release)

Closed (Locked)

1. To attach, remove the two top gear case
screws (Fig. 3).

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.

6 7

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. 6

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. 7). Do
not hold gray gear case when
impacting or drilling.

Fig. 7

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.

V28™ Lithium-Ion Battery Pack

Unlike other battery pack types, Lithium-Ion
battery packs deliver fade-free power for their
entire run time. The tool will not experience
a slow, gradual loss of power as you work.
To signal to you that the V28 battery pack
is at the end of its run time and needs to be
charged, power to the tool will drop quickly.
When this happens, remove the tool from
the workpiece and charge the battery pack
as needed.

Battery Pack Protection

T o protect itself from damage and extend its
life, the V28 battery pack's intelligent circuit
will turn off the battery pack if its internal
temperature becomes too high. This could
happen in extremely high torque, binding
and stalling situations. The pack must be
placed on the charger to turn it back on.
The charger's light indicator will fl ash red,
indicating that the pack is too hot. Once the
light is continuously red, the pack has cooled
and can be used again.

Cold Weather Operation

The V28 Lithium-Ion battery pack can be
used in temperatures down to -4°F. When
the battery pack is very cold, it may pulse for
the fi rst minute of use to warm itself up. Put
the battery pack on a tool and use the tool in
a light application. After about a minute, the
pack will have warmed itself up and operate
normally.

8 9

MAINTENANCE

WARNING

To reduce the risk of personal 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 MILW AUKEE service facility for ALL
repairs.

Maintaining Tool

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

• Brush inspection and replacement

• Mechanical inspection and cleaning
(gears, spindles, bearings, housing,
etc.)

• Electrical inspection (battery pack,
charger, motor)

• T esting to assure proper mechanical and
electrical operation

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.

Maintaining and Storing Battery Pack

V28™ Lithium-Ion battery packs will operate
for many years and/or hundreds of charging
cycles when they are maintained and used
correctly. Refer to your battery pack and
charger operator's manual for proper care
and use.

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 out dust and debris from vents and
electrical contacts by blowing with com­pressed air. 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, keeping away from all electri­cal contacts. 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.

WARNING

To reduce the risk of injury or explo­sion, never burn or incinerate a bat­tery pack even if it is damaged, dead
or completely discharged. When
burned, toxic fumes and materials
are created.

Disposing of Lithium-Ion Battery Packs

Lithium-Ion battery packs are more envi­ronmentally friendly than some other types
of power tool battery packs (e.g., nickel­cadmium). Always dispose of your battery
pack according to federal, state and local
regulations. Contact a recycling agency in
your area for recycling locations.

Even discharged battery packs contain some
energy. Before disposing, use electrical tape
to cover the terminals to prevent the battery
pack from shorting, which could cause a fi re
or explosion.

RBRC Battery Recycling Seals

The RBRC™ Battery Recycling Seals (see
"Symbology") on your tool battery packs
indicate that MILWAUKEE has arranged
for the recycling of that battery pack with
the Rechargeable Battery Recycling Cor­poration (RBRC). At the end of your battery
pack's useful life, return the battery pack to a
MILWAUKEE Branch Offi ce/Service Center
or the participating retailer nearest you. For
more information, visit the RBRC web site
at www.rbrc.org.

Repairs

For repairs, return the tool, battery pack and
charger to the nearest authorized service
center.

ACCESSORIES

WARNING

Always remove battery pack before
changing or removing accessories.
Only use accessories specifically
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.

FIVE YEAR TOOL

LIMITED WARRANTY

Every MILWAUKEE tool is tested before
leaving the factory and is warranted to be
free from defects in material and workman­ship. MILWAUKEE will repair or replace (at
MILWAUKEE’s discretion), without charge,
any tool (including battery chargers) which
examination proves to be defective in ma­terial or workmanship from fi ve (5) years
after the date of purchase. Return the tool
and a copy of the purchase receipt or other
proof of purchase to a MILW AUKEE Factory
Service/Sales Support Branch location or
MILWAUKEE Authorized Service Station,
freight prepaid and insured. This warranty
does not cover damage from repairs made
or attempted by other than MILW AUKEE au­thorized personnel, abuse, normal wear and
tear, lack of maintenance, or accidents.

The warranty period for V28 Battery Packs
is two (2) years from the date of purchase.
The warranty period for Ni-Cd battery Packs,
Flashlights, Radios are warranted for one (1)
year from the date of purchase.

THE REPAIR AND REPLACEMENT REM­EDIES DESCRIBED HEREIN ARE EXCLU­SIVE. IN NO EVENT SHALL MILWAUKEE
BE LIABLE FOR ANY INCIDENTAL, SPE­CIAL, OR CONSEQUENTIAL DAMAGES,
INCLUDING LOSS OF PROFITS.

THIS WARRANTY IS EXCLUSIVE AND IN
LIEU OF ALL OTHER WARRANTIES, OR
CONDITIONS, WRITTEN OR ORAL, EX­PRESSED OR IMPLIED FOR MERCHANT­ABLILITY OR FITNESS FOR P ARTICULAR
USE OR PURPOSE.

This warranty gives you specifi c legal rights.
Y ou may also have other rights that vary from
state to state and province to province. In
those states that do not allow the exclusion of
implied warranties or limitation of incidental
or consequential damages, the above limi­tations or exclusions may not apply to you.
This warranty applies to the United States,
Canada, and Mexico only.

10 11