DWMT70773L TYPE 0
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iNSTRUCTiON MANUAL
GUIDE D'UTILISATION
MANUAL DE INSTRUCCIONES
INSTRUCTIVO DE OPERACION, CENTROS DE SERVICIO Y POLIZA
DE GARANTiA. ADVERTENClA: L¢:ASE ESTE INSTRUCTIVO ANTES
DE USAR EL PRODUCTO.
DWMT70773L
1/2" Impact Wrench Heavy Duty
Cle a chocs de 12,7 mm (1/2 po) service intensif
Llave de impacto de 12,7 mm (1/2") para servicio pesado
®
DWMTTO773L
1/2" iMPACT WRENCH HEAVY DUTY
FIG.1
A. 1/2" Square Drive
B. Trigger
C. Forward/Reverse Switch
D. Ergonomic Handle
E. 1/4" Air Inlet
SPECIFiCATiONS
MODEL
i SQUARE DRIVE
CLUTCH TYPE
MAXIMUM TORQUE (REVERSE)
FREE SPEED (@90PSI)
BLOWS PER MINUTE
NET WEIGHT
EXHAUST TYPE
AVERAGE AiR CONSUMPTION
FREE SPEED
AVERAGE AiR CONSUMPTION AT
LOAD
AIR INTLET SIZE
RECOMMENDED HOSE SIZE
MAX. AIR PRESSURE
R Shock Resistant Housing
Bumpers
G. Composite Body
H. Twin Hammer Mechanism
I. Exhaust
J. Adjustable Power Dial
DWMT70773L
1/2"
Twin Hammer
650 Ft.Lbs (880 Nm)
7500 RPM
1100 BPM
4.63 LBS (2.1Kg.)
Handle
41.5SCFM (19.6 L/s)
5.9 CFM (2.8 L!s)
27.2SCFM (12.8 L/s)
3.9 CFM (1.8 L/s)
1/4" NPT(F)
3/8" (10MM)
9O PSI
C
Definitions: Safety Guidelines
The definitions below describe the levelof severity
for each signal word. Please read the manual and pay
attention to these symbols.
_ DANGER: Indicates an imminently hazardous
situation which, if not avoided, will result in death
or serious injury.
_, WARNING: Indicates a potentially hazardous
situation which, if not avoided, could result in death
or serious injury.
CAUTION: Indicates a potentially hazardous
situation which, if not avoided, may result in minor
or moderate injury.
CAUTION: Used without the safety alert symbol
indicates a potentially hazardous situation which,
if not avoided, may result in property damage.
IF YOU HAVE ANY QUESTIONS OR COMMENTS ABOUT
THIS OR ANY DEWALT TOOL, CALL US TOLL FREE AT:
I=800=4=DEWALT (1=800=433=9258)
IMPORTANT SAFETY INSTRUCTIONS
_k WARNING: Some dust created by.power sanding, sawing,
grinding, drilling, and other construcli6n activities contains chemicals
known to the State of California to cause cancer, birth defects or
other reproductive harm. Some example of these chemicals are:
* Lead from lead-based paints
* Crystalline silica from bricks and cement
and other masonry products
* Arsenic and chromium from chemically-treated lumber
Yourrisk from these exposures varies, depending on how often you
do this type of work. To reduce your exposure to these chemicals:
work in a weft ventilated area, and work with approved safety
equipment, always wear OSNA/MSNA/NIOSH approved,
properly fitting face mask or respirator when using such tools.
When using air tools, basic safety precautions should always be
followed to reduce the risk of personal injury.
,& WARNING: This product contains chemicals, known to the
State of Cafifornia to cause cancer, and birth defects or other
reproductive harm. Wash hands after handling.
SAVE THESE INSTRUCTIONS
A WARNING:
Improper operation or maintenance of this product
could result in serious injury and property damage.
Read and understand aft warnings and operating
instructions before using this equipment. When using
air tools, basicsafety precautions should always be
followed to reduce the risk of personal injury.
A WARNING:
(_ Read and understand this instruction manual and tool labels
before installing, operating or servicing this tool. Keep these
instructions in a safe accessible place.
_ Operators and others in work wear ANSI Z87. CAN/
CSA Z94.3 approved safety glasses with side shields.
Operators and others in work area must wear ear protection.
,_ Oil daily for optimal performance.
area must I
A WARNING:
* Avoidprolonged use: repetitive motion or exposure to vibration
may be harmful to your hands or arms. Use gloves toprovide
extra cushion, take frequent rest periods, and limit daily
time of use.
* DO NOT Use oxygen or reactive gases; explosion may occur.
* DO NOT Exceed air pressure of 90 PSL
, Read all manuals included with this product carefully.
Be thoroughly familiar with the controls and the proper use
of the equipment.
, Only persons well acquainted with these rules of safe operation
should be allowed to use the air tool
* DO NOT exceed any pressure rating of any component
in the system.
* Disconnect the air tool from air supply before changing tools or
attachments and during non-operation.
, Always wear safety glasses and ear protection during operation.
Always wear approved safety glasses with shields. Always wear
approved hearing protection.
* DO NOT wear loose fitting clothing or apparel which contains
loose straps or ties, etc. Which could become entangled in
moving parts of the tool and results in serious personal injury.
, DO NOT wear jewel_ watches, identifications, bracelets,
necklace, etc. When operating any tool, they may become
caught in moving parts and result in serious injury.
* DO NOT depress trigger when connecting the air supply hose.
* Always use attachments designed for use with air
powered impact tools.
* DO NOT use damaged or worn attachments.
_, WARNING:
DO NOT use hand tool sockets. Use impact quafity sockets only.
A WARNING:
• Never trigger the tool when not applied to a work object
Attachments must be securely attached.
Loose attachments can cause serious injury.
• Protect air lines from damage or puncture.
• Never point an air tool at oneseff or any other person.
Serious injury could occur.
• Check air hoses for weak or worn condition before each use.
Make sure all connections are secure.
• Keep all nuts, bolts and screws tight and ensure equipment is in
safe working condition.
• DO NOTput hands near or under moving parts.
_ WARNING: RISK OF EXPLOSION OR FIRE
WHAT CAN HAPPEN
• Abrasive tools such as
sanders and grinders,
rotating tools such as drills,
and impact tools such as
wrenches, hammers,
and reciprocating saws
are capable of generating
sparks which could
result inignition of
flammable materials.
• Exceeding the maximum
pressure rating of tools
accessories could cause
an explosion resulting
in serious injury.
HOWTO PREVENT IT
• Never operate tools near
flammable substances such
as gasoline, naptha,
cleaning solvents, etc.
• Work in a clean, well
ventilated area free of
combustible materials.
Never use oxygen,
carbon dioxide or other
bottled gases as a power
source for air tools.
Use compressed air regulated
to a maximum pressure at or
below the rated pressure
of any attachments.
WARNING: RiSK TO BREATHING (ASPHYXIATION)
WHAT CAN HAPPEN HOW TO PREVENT IT
• Abrasive tools, such as
grinders, sanders, and
cut-off tools generate dust
and abrasive materials which
can be harmful to human
lungs and respiratory system.
Some materials such as
adhesives and tar contain
chemicals whose vapors
could cause serious injury
with prolonged exposure.
CAUTION: RISK FROM NOISE
WHAT CAN HAPPEN HOWTO PREVENT IT
Long term exposure to noise
produced from the operation
of air tools can lead to
permanent hearing loss.
• Always wear MSHA/NIOSH
approved, properly fitting face
mask or respirator when
using such tools.
• Always work in a clean, dry,
well ventilated area.
• Always wear ANSI (S3.19)
hearing protection.
AWARNING: RISK OF INJURY
WHAT CAN HAPPEN
• Tools left unattended, or with
the air hose attached can be
activated by unauthorized
persons leading to their injury
or injury to others.
• Air tools can propel loose
objects or other materials
throughout the work area.
• Air tools can become
activated by accident during
maintenance or tool changes.
• A wrench or a key that is left
attached to a rotating part of
the tool increases the risk of
personal injury.
HOWTO PREVENT IT
• Remove air hose when tool
is not in use and store tool
in a secure location away
from reach of children and/or
untrained users.
Use only parts, fasteners, and
accessories recommended by
the manufacturer.
Keep work area clean and free
of clutter. Keep children and
others away from work area
during operation of the tool.
Keep work area well lit.
Remove air hose to lubricate,
add, or replace sockets.
Never carry the tool
bythe hose.
• Avoid unintentional startin.q.
Don't carry, hooked-up too[ with
finger on trigger.
• Repair service should be done
only by an authorized service
representative.
Remove adjusting keys and
wrench before turning
the tool on.
WHAT CAN HAPPEN
• Using inflator nozzles for
duster applications can cause
serious injury.
• Air tools can cause the work
piece to move upon contact
leading to injury.
• Loss of control of the tool can
lead to injury to self or others
Poor quality, improper, or
damaged tools such as
grinding wheels, chisels,
sockets, drill, etc., can fly
apart during operation,
propelling particles
throughout the work area
causing serious injury.
HOWTO PREVENT IT
• DO NOT use inflator nozzles
for duster applications.
• Use clamps or other devices
to prevent movement.
Never operate tool while
under the influence of
drugs or alcohol.
o
Don't overreach. Keep proper
footing and balance at all times.
o
Keep handles dry, clean, and
free from oil and grease.
o
Stay alert. Watch what you are
doing. Use common sense.
Do not operate tool when
you are tired.
Always use tool attachments
rated for the speed of
the power tool.
Never use tools which have
been dropped, impacted or
damaged by use.
t
Use only impact grade sockets
on an impact wrench.
o
Do not apply excessive force
to the tool - let the tool
perform the work.
$_WARNING: RiSK OF INJURY (CONTINUED)
WHAT CAN HAPPEN HOWTO PREVENT iT
• Improperly maintained tool
and accessories can
cause serious injury.
• There is a risk of bursting if
the tool isdamaged.
Fasteners could ricochet or
be propelled causing serious
injury or property damage.
Maintain the tool with care.
• Check for misalignment or
binding of moving parts,
breakage of parts, and any
other condition that affects the
tool's operation. If damaged,
have the tool serviced
before using.
• Never point discharge of tool
atself or others.
• Do not pull trigger unless
tool contact safety device is
against work surface.
• Never attempt to drive
fasteners into hard surfaces
such as steel, concrete, or tile.
• Take care to avoid driving
afastener on top of
another fastener.
• Position tool carefully so that
fasteners will be delivered to
the proper location.
ik WARNING: RISK OF ELETRIC SHOCK
WHAT CAN HAPPEN HOWTO PREVENT IT
• This tool is not provided with
an insulated gripping surface.
Contact with a "live" wire will
also make exposed metal
parts of the tool "live"
and can result in
electrocution or death.
• Avoid body contact with
grounded surfaces such as
pipes, radiators, ranges, and
refrigerators. There is an
increased risk of electric shock
if your body is grounded.
• Thoroughly investigate the
workpiece for possible hidden
wring before performing work.
WARNING: RiSK FROM FLYING OBJECTS
WHAT CAN HAPPEN HOWTO PREVENT IT
• Air powered equipment and
power tools are capable of
propelling materials such as
metal chips, saw dust, and
other debris at high speed,
which could result in
serious eye injury.
• Compressed air can be
hazardous. The air stream
can cause injury to soft tissue
areas such as eyes, ears, etc.
Particles or objects
propelled by the stream
can cause injury.
• Toolattachments can be
come loose or break and fly
apart propelling particles at
the operator and others
in the work area.
• Always wear ANSI Z87.1
CAN/CSA Z94.3 approved
safety glasses with side
shields.
• Never leave operating tool
unattended. Disconnect air
hose when tool is not in use.
For additional protection use
an approved face shield in
addition to safety glasses.
Make sure that any
attachments are
securely assembled.
A WARNING: RISK OF CUT OR BURNS
WHAT CAN HAPPEN HOWTO PREVENT IT
Tools which cut, shear,
drill, punch, chisel, etc.,
are capable of causing
serious injury.
WARNING:RISK OF
WHATCAN HAPPEN
Tools which contain moving
elements, or drive other
moving tools such as grinding
wheels, sockets, sanding
discs,etc., can become
entangled in hair,clothing,
jewelry and other loose
objects, resulting
in severe injury.
• Keep the working part
of the tool away from
hands and body.
ENTANGLEMENT
HOWTO PREVENT IT
• Never wear loose fitting
clothes, or apparel which
contains loose straps or ties,
etc., which could become
entangled in moving parts
of the tool.
• Remove any jewelry, watches,
identifications, bracelets,
necklaces, etc., which might
become caught by the tool.
• Keep hands away from moving
parts. Tie up or cover long hair.
• Always wear proper fitting
clothing and other safety
equipment when
using this tool.
_'_WARNING: AIR SUPPLY AND CONNECTIONS
* Do not use oxygen, combustible gases, or bottled gases
as a power source for this tool as the tool may explode,
possibly causing injury.
* Do not use supply sources which can potentially exceed
200 PSI (13.8 bar) as tool may burst, possibly causing injury.
* The connector on the tool must not hold pressure
when air supply is disconnected. If a wrong fitting is used,
the tool can remain charged with air after disconnecting
and thus will be able to after the air line is disconnected
possibly causing injury.
* Always disconnect air supply:
1) Before making adjustments;
2) When servicing the tool;
3) When tool is not in use;
4) When moving to a different work area, as accidental
actuation may occur, possibly causing injury.
SAVE THESE INSTRUCTIONS
FOR FUTURE USE
FEATURES
ADJUSTABLE POWER DiAL
The dial (J) controls the torque power.
Torque increases with larger circle
settings.
SQUARE DRIVE
The 1/2" square drive (A) allows
attachment of sockets with a
insulation from cold air passing
through the handle.
TRIGGER
The trigger (B) allows the operator
to control the start and stop of the
air tool.
FORWARD/REVERSE SWITCH
The forward/reverse switch (C)
is easily accessible with one hand
from the left and/or the right side
of the tool for quick directional
changeover.
TWIN HAMMER MECHANISM
This air tool contains a twin hammer mechanism which provides
more durability and a longer tool life.
COMPOSITE BODY
The body of the air tool is a high-impact composite design (G)
for reduced weight and superior power-to-weight ratio.
The composite body reduces fatigue and provides insulation from
cold air passing through the handle.
HANDLE
This air tool has an ergonomic grip (D)
made of molded thermoplastic elastomer
(TPE) design for improved comfort,
slippage reduction, and better
tool control.
AiR INLET
The tool's air inlet (E) located at
the bottom of the handle is used for
connecting an air supply with a standard
1/4" NPT American thread.
EXHAUST
The exhaust (I) is located at the base of
the handle and allows the exhaust to be
directed away from the operator and work-
ing area.
SHOCK RESISTANT HOUSING
BUMPERS
The shock resistant housing
bumpers (F) provide protection against housing cracks from
accidental drops of the air tool.
lO
INSTA[.LA TION
Air Supply
The recommended hook-up isshown inFigure A. Pneumatic tools
operate on a wide range of air pressures. For maximum efficiency
and longer tool life, the pressure of the air supplied to these
tools MUST not exceed the rated PSi at the tool when the tool is
running. Using a higher than rated pressure will cause faster wear
and drastically shorten the tool's life. A higher air pressure can also
cause an unsafe condition and explosion.
The inside diameter of the hose should be increased to
compensate for unusually long air hoses (over 25 feet).
Minimum hose diameter should be 3/8" I.D. and fittings should
have 1/4" NPT thread.
The use of air line lubricators and air line
filters is recommended to prevent water in
the line that can damage the tool. Drain the
air tank daily. Clean the air inlet filter screen
on at least a weekly schedule to remove
accumulated dirt or other matter that can
restrict air flow.
The tool's air inlet used for connecting
an air supply has standard 1/4" NPT
American thread.
Figure A
reel _ .J:.L,
Safety Rules For Pneumatic Tools
1) Inspect the air hose for cracks or other problems.
Replace the hose if worn.
2) Never point an air hose at another person.
3) Disconnect the tool when not in use, or before performing
service or changing accessories.
4) Use proper hoses and fittings. Never use quick change
couplings attached to the tool. Instead, add a hose and
coupling between the tool and the air supply.
_ _==_,
-= b=_
-- Coupler....
1/2"(or larger) ....... _" 'J_ ,_"
PipeandFittings_i i
L.... LJ L_
LJ....
d 1
u\ o k ,jj r,
eaderH DrainDaily -_=I
11
Nipple
Oiler Filter _, =",'
i=i
PREPARATION FOR USE
Proper Use Of The Tool
Your new 1/2" Drive Impact Wrench is designed for driving, tightening
and loosening threaded fasteners, usually nuts and bolts, when fitted
with a suitable impact socket. Always use impact-rated extension
bars, universal joints and socket adapters between the square
output drive of the impact wrench and the female square drive of the
socket. Do not use the tool for any other purpose than that specified
without consulting the manufacturer or the manufacturer's authorized
supplier. To do so may be dangerous.
Never use the impact wrench as a hammer to dislodge or
straighten cross threaded fasteners. Never attempt to modify
the tool for other uses.
Work Stations
Your impact wrench should only be used as a hand operated tool.
It is always recommended that the tool is used when standing with
solid footing. It can be used in other positions but before any such
use, the operator must be in a secure position having a firm grip and
footing and be aware that when loosening fasteners the tool can
move quite quickly away from the fastener being undone. An
allowance must always be made for this rearward movement so as
to avoid the possibility of hand!arm/body entrapment.
Putting Into Service
Air Supply
iJ,CAUTION: This air tool requires lubrication BEFORE initial use,
also before and after each additional use.
WARNING: Use a clean lubricated air supply that will give a
measured air pressure at the tool of 90 psi!6.2 bar when the tool
is running with the trigger fully depressed.
Use recommended hose size. It is recommended that the tool is
connected to the air supply as shown in figure A on page 11. Do
not connect the tool to the air line system without incorporating an
easy to reach and operate air shut off valve. The air supply should
be lubricated. It is strongly recommended that an air filter, regulator,
lubricator (FRL) is used as shown infigure A on page 11 as this
will supply clean, lubricated air at the correct pressure to the tool.
Details of such equipment can be obtained from your supplier. If
such equipment is not used then the tool should be lubricated by
shutting off the air supply to the tool and then depressurizing
the line by pressing the trigger on the tool. Disconnect the air
line and pour into the air inlet 1 teaspoon (5cc.) of a
suitable pneumatic motor lubricating oil, preferably incorporating
a rust inhibitor. Reconnect tool to air supply and run tool slowly for a
few seconds to allow air to circulate the oil.
Lubricate tool daily if used frequently, or when it starts to slow
or lose power.
Using An impact Wrench
A WARNING:
1) Read all instructions before using this tool. All operators must
be fully trained in its use and aware of these safety rules.
2 Do not exceed the maximum working air pressure of
90 psi/6.2 bar.
3 Use personal safety equipment.
4 Use only compressed air at the recommended conditions.
5 If the tool appears to malfunction, remove from use
immediately and arrange for service and repair.
6 If the tool is used with a balancer or other support device,
ensure that it is fixed securely.
7 Always keep hands away from the working attachment fitted to
the tool.
8) The tool is not electrically insulated. Never use the tool if there
is any chance of it coming into contact with live electricity.
9) When using the tool, always adopt a firm footing and/or position
and grip the tool firmly to counteract any forces or
reaction forces that may be generated while using the tool.
12
Using an impact Wrench Continued
10) Use only genuine Dewalt spare parts or parts which perform
equivalently. Do not make temporary or permanent repairs with
unauthorized parts.
11) Do not lock, tape, wire, etc., the on/off trigger in the run position.
The trigger must always be free to return to the "off" position
when it is released.
12) Always shut off the air supply to the tool and depress the trigger
to release air from the feedhose before fitting, adjusting or
removing the working attachment.
13) Check hoses and fittings regularly for wear. Replace if
necessary. Do not carry the tool by its hose. Ensure the hand is
removed from the on/off trigger when carrying the tool with the
air supply connected.
14) Take care against entanglement of moving tool parts with
clothing, ties, hair, cleaning rags, etc. This will cause the body to
be drawn towards the tool andrcan be very dangerous.
15) Safe working practices and observe all relevant legal
requirements when installing, using or maintaining the tool.
16) Only install the tool when an easily accessible and easily
operable on/off switch is incorporated in the air supply.
17) Take care that the tool exhaust air does not cause problems
or blow onto another person.
18) Never lay a tool down unless the working attachment has
stopped moving.
19) Always ensure that the forward/reverse switch is in the desired
position before starting the tool.
20) Do not use sockets with excessive wear to the input or output
drives. Periodically check the square drive on the impact wrench.
Make surer the socket, extension bar, or other attachment is
securely fitted before operating tool.
21) When loosening fasteners first ensure that there is sufficient
clearance behind the tool to avoid hand entrapment. The tool will
move away from the threaded joint as the nut/bolt is loosened
and rides up the thread, moving the tool with it.
PRE-START CHECKLIST
• Drain water from air compressor tank and condensation from
air lines. (Please refer to air compressor's operation manual.)
, Lubricate the tool. (Please refer to the "Maintenance" section
in the manual.)
, Select the necessary impact sockets. The sockets have to
match with the size of the drive on the air impact wrench.
, Connect air impact wrench to air source with
the hose of recommended size.
,_ WARNING: Risk of unsafe operation. Firmly grasp air hose
with hand when installing or disconnenting to prevent hose whip.
_, WARNING: Risk of bursting. Too much air pressure causes
a hazardous risk of bursting. Check the manufacturer's maximum
pressure rating for air tools and accessories. The regulator output
pressure must never exceed the maximum pressure rating.
OPERATING PROCEDURES
START-UP 1,PC.2j
Turn on the air compressor and allow the air tank to be filled.
• Set the air compressor regulator to 90 PSI. This air
tool operates at a maximum of 90 PSi air pressure.
• Adjust power dial (if it is available) to desired torque.
• Adjust tool either in forward or reverse position. See Features on
page 10 for diagram.
, Depress the trigger to start operating the tool.
SHUT-DOWN (FIG. 1_ PG. 2)
• Release the trigger in order to stop the tool.
• When changing sockets, always disconnect air supply to
avoid injury.
• When job is completed, turn off the air compressor and store
the air tool after lubrication.
13
OPERATING INSTRUCTIONS
• Securely fit the socket or attachment to the impact wrench.
• Ensure that the forward/reverse switch is in the correct position
for tightening or loosening the fastener.
• The nut/bolt can then run down the thread using the power
drive of the tool. For loosening a joint the tool can be used
in the reverse sequence.
MAINTENANCE
Lubrication
Air tools require lubrication throughout the lifetime of the tools.
The air motor and bearing uses compressed air to power the tool.
The compressed air contains moisture that will rust the air motor
and other parts in side of the tools, therefore lubrication is required
daily. Failure to lubricate the air tool properly will dramatically
shorten the life of the tool and will void the warranty
CAUTION: This air tool requires lubrication BEFORE initial use,
also before and after each additional use.
To Lubricate The Air Tool Manually:
1. Remove any attachment on the drive of air tools, such as:
sockets, chisels and etc.
2. Disconnect the tool from the air supply source, place
the air inlet face up.
3. Depress the trigger and place about 1 teaspoon
(5cc.) of air tool oil into the air inlet. (Depressing the trigger
will help circulate oil in the motor.)
NOTE:Use SAE #10 weight oil if air tool oil is not available.
4. Connect the tool to an air source, cover the exhaust end
with a towel and run for about 20 to 30 seconds.
•_ WARNING: Keep out of the reach of children, ff taken internally, do
not induce vomiting, call a doctor immediately.
/& WARNING: Any excess oil in the motor is immediately expelled
from the exhaust port. Always direct exhaust port away from people
or objects.
Storage:
The air tool must be lubricated before storing.
Follow the "Lubrication" instruction with exception of step 4.
SERVICE INFORMATION
Please have the following information available for all service calls:
Model Number
Date and Place of Purchase
FULL THREE YEARS WARRANTY
DEWALT heavy duty industrial tools are warranted for 3 years from
date of purchase. We will repair, without charge, any defects due
to faulty materials or workmanship. For warranty repair information,
call 1-800-4=DEWALT. This warranty does not apply to accessories
or damage caused where repairs have been made or attempted by
others. This warranty gives you specific legal rights and you may
have other rights which vary in certain states or provinces.
Latin America: This warranty does not apply to products sold in
Latin America. For products sold in Latin America, see country
specific warranty information contained either in the packaging, call
the local company or see website for warranty information.
FREE WARNING LABEL REPLACEMENT: If your warning labels
become illegible or are missing, call I=800=4=DEWALT
for a free replacement.
14
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