Milwaukee 9098-23, 9078-20 User Manual
OPERATOR'S MANUAL
MANUEL de L'UTILISATEUR
MANUAL del OPERADOR
Cat. No.
No de Cat.
9078-20
9098-23
18 VOLT IMPACT WRENCH
CLÉ À PERCUSSION 18V
LLAVE DE IMPACTO DE 18V
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 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 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.
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. Wear ear protectors with impact
drills. Exposure to noise can cause
hearing loss.
2. Hold power tools by insulated grip-
ping 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.
3. Maintain labels and nameplates.
These carry important information.
If unreadable or missing, contact a
MILWAUKEE service facility for a free
replacement.
4. 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.
Specifi cations
Cat.
No.
9078-20
9079-20
9098-23
9099-20
* Output rated at full speed
Volts
DC
18
18
18
18
No Load
RPM
0 - 1350
0 - 1400
0 - 1400
0 - 1400
Drive
Shank
3/4"
1/2"
5/8" Hex
7/16" Hex
Symbology
Impacts
Per Min-
ute
0 - 2150
0 - 2200
0 - 2200
0 - 2200
Volts Direct Current
Impacts per Minute
Under Load (IPM)
Underwriters
Laboratories, Inc.
Average
Torque
Output*
325 ft-lbs.*
240 ft-lbs.*
270 ft-lbs.*
270 ft-lbs.*
FUNCTIONAL DESCRIPTION
1
1. Drive shank
2. Forward/Reverse switch
3. Trigger
4. Battery pack
5. Battery pack release buttons
6. Quick change chuck
(Cat. No. 9098-23 and 9099-20)
7. Tool hanger
(Cat. No. 9098-23 and 9099-20)
8. Tool hanger ring
(Cat. No. 9098-23 and 9099-20)
Cat. No. 9099-20
2
4
Cat. No. 9079-20
3
5
8
Cat. No. 9078-20
Quick Change Chuck Capacities*
Cat. No.
9079-20
9098-23
9099-20
* Only for use with the 7/16" and 5/8" Hex Quick Change chuck,
standard equipment on the 9099-20 (7/16") and 9098-23 (5/8"),
optional accessory (Cat. No. 48-66-0061) on other models.
Quick Change Auger Bits
1-1/2"
1-1/2"
1-1/2"
4 5
Selfeed Bits
2-9/16"
2-9/16"
2-9/16"
7
6
1
ASSEMBLY
WARNING
Recharge only with the charger
specifi ed for the battery pack. For
specifi c charging instructions, read
the operator's manual supplied with
your charger and battery pack.
WARNING
Always lock trigger or remove
battery pack before changing or
removing accessories. Only use
accessories specifically recommended for this tool. Others may
be hazardous.
Removing Battery Pack from Tool
Push in the release buttons and remove the
battery pack.
Inserting Battery Pack into Tool
Battery pack can be inserted into the tool
in two ways.
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 (Fig. 1). Insert the battery pack until
clamp engages.
Fig. 1
Fig. 4
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 (Fig. 2). Insert the battery pack
until clamp engages.
Fig. 2
1. To attach a socket or other accessory,
push the accessory onto the drive
shank until it snaps into place.
2. To remove the accessory, pull it off the
drive shank.
Drive shank
WARNING
Attaching and Removing the Tool Hanger
(Cat. No. 9098-23, 9099-20 or as an accessory)
Fig. 3
Gear case
screws
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.
Attaching and Removing Accessories
(Cat. No. 9078-20)
This impact wrench is intended only for use
with sockets designed for impact wrenches
and that have a 3/4" square drive. Other
sockets could shatter or break, causing
injury.
6 7
Ring
Tool
hanger
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. 9079-20)
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. 5
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. 9098-23, 9099-20, or other Impact
Wrenches using the Quick Change 1/2"
Square Drive to 7/16" Hex Adapter
Cat. No. 9099-20 and accessory Cat. No.
48-66-0061 are intended for use with drill
bits and adapters with a 7/16" Hex Quick
Change shank. Cat. No. 9098-23 is intended
for use with drill bits and adapters with a
5/8" Hex Quick Change shank. Both Hex
Quick Change shanks have a ball-retainer
groove. They are not intended for use with
Hex Shank Bit Extensions.
Fig. 6
Ball-retainer
groove
1. To attach an accessory, pull the chuck
2. T o remove the accessory , pull the chuck
Open (Release)
Closed (Locked)
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.
collar forward and remove the accessory. Release the collar.
OPERATION
WARNING
When tool is not in use, lock trigger to
prevent the tool from being accidentally turned on.
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. 7
Forward
Forward/
Reverse
switch
WARNING
To reduce the risk of injury, keep
hands and away from the bit and all
moving parts.
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. 8). Do not hold gray gear
case when impacting or drilling.
Fig. 8
Starting, Stopping and Controlling
Speed
This impact wrench may be operated at any
speed from 0 to full speed.
1. To start the tool, pull the trigger.
2. To vary the driving speed, increase or
decrease pressure on the trigger. The
further the trigger is pulled, the greater
the speed.
3. To stop the tool, release the trigger.
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.
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.
8 9
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.
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 examination, 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), Ni-Cd battery packs, Work Lights
(cordless fl ashlights), Job Site Radios, and Trade Titans™ Industrial Work Carts is one (1) year from the
date of purchase.
*There is a separate warranty for Li-Ion Battery Packs that accompany the power tools:
*Every MILWAUKEE Li-Ion Battery Pack 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 Li-Ion Battery Pack 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 Service Reader. After 1000 charges/2 years from the
date of purchase/fi rst charge, the customer will be charged a prorated amount for the service rendered.
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 MIL WAUKEE PRODUCT. IF YOU
DO NOT AGREE T O 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, F AILURE 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 WARRANTY 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.
Please consult MILWAUKEE’s website www.milwaukeetool.com or call 1.800.SAWDUST (1.800.729.3878)
to locate your nearest service facility for warranty and non-warranty service on a MILWAUKEE electric power
tool.
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.
10 11
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