MCL1238HPIW, -G, -O, -Y 1 10/12/18
ALWAYS READ
INSTRUCTIONS
BEFORE USING
POWER TOOLS
ALWAYS WEAR
SAFETY GOGGLES
ALWAYS WEAR
HEARING
PROTECTION
AVOID
PROLONGED
EXPOSURE TO
VIBRATION
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 paints,
• 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.
Copyright © Professional Tool Products, 2018
All rights reserved.
Operating Instructions • Warning Information • Parts Breakdown
SPECIFICATIONS
WARNING
WARNING
Drive Size ....................................... 3/8” square
Max Torque ......................................... 150 ft-lbs
Impact per minute ......................................3100
Free Speed .............................................0-2400
Overall length .......................................... 5-7/8”
Weight w/battery .....................................3.0 lbs
Height w/battery ............................................. 9”
Battery Type .................................................12V
Charging time ................................< 40 minutes
Compatible Battery .... MUC108LB, MUC12LB, MUC122LB
Compatible Charger ...................... MUC108LC, MUC12LC
MCL1238HPIW
MCL1238HPIWG
MCL1238HPIWO
MCL1238HPIWY
CLÉ À CHOCS HAUTE PUISSANCE 3/8 PO 12V LI-ION
LLAVE DE IMPACTO DE ALTA POTENCIA
DE IÓN DE LITIO 12V 3/8"
IMPACT WRENCH
HIGH POWER
12V LI-ION
8
3
MCL1238HPIW, -G, -O, -Y 2 10/12/18
MCL1238HPIW, -G, -O, -Y 12V 3/8" High Power Impact Wrench
SAVE THESE INSTRUCTIONS!
GENERAL SAFETY INFORMATION
(FOR ALL BATTERY OPERATED TOOLS)
WARNING:
Read and understand all instructions. Failure to follow
all instructions listed below, may result in electric
shock, fire, explosion and/or serious personal injury.
It is the responsibility of the owner to make sure all
personnel read this manual prior to using the device. It
is also the responsibility of the device owner to keep
this manual intact and in a convenient location for all to
see and read. If the manual or product labels are lost
or not legible, contact Matco Tools for replacements. If
the operator is not fluent in English, the product and
safety instructions shall be read and discussed with
the operator in the operator's native language by the
purchaser/owner or his designee, making sure that the
operator comprehends its contents.
Work Area Safety
• Keep your work area clean and well lit.
Cluttered benches and dark areas invite accidents.
• 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.
• Keep bystanders, children, and visitors away while operating
a power tool. Distractions can cause you to lose control and
endanger others.
Electrical Safety
• A battery operated tool with integral batteries or a separate
battery pack must be recharged only with the specified
charger for the battery. A charger that may be suitable for
one type of battery may create a risk of fire when used with
another battery.
• Use battery operated tool only with specifically designated
battery pack. Use of any other batteries may create a risk
of fire.
Personal Safety
• Stay alert, watch what you are doing, and use common sense
when operating a power tool. Do not use tool while tired or
under the influence of drugs, alcohol, or medication.
A moment of inattention while operating power tools may
result in serious personal injury.
• Dress properly. Do not wear loose clothing or jewelry.
Contain long hair. Keep your hair, clothing, and gloves away
from moving parts. Loose clothes, jewelry, or long hair can be
caught in moving parts.
• Avoid accidental starting. Be sure switch is in the locked or
"off" position before inserting battery pack. Carrying tools
with your finger on the switch or inserting the battery pack
into a tool with the switch on invites accidents.
• Repetitive motions or exposure to vibration may be harmful to
hands or arms.
• Remove adjusting keys or wrenches before turning the tool
on. A wrench or a key that is left attached to a rotating part
of the tool may result in personal injury.
• Do not overreach. Keep proper footing and balance at all
times. Proper footing and balance enable better control of
the tool in unexpected situations.
• Use safety equipment. Always wear eye protection.
Dust mask, non-skid safety shoes, hard hat, or hearing
protection must be used for appropriate conditions.
Tool Use and Care
• Do not use (or modify) the tool for any other purpose than
that for which it was designed without consulting the
manufacturer's authorized representative.
• Use clamps or another practical way to secure and support
the workpiece to a stable platform. Holding the work by hand
or against your body is unstable and may lead to loss of
control.
• Do not force tool. Use the correct tool for your application.
• Do not use tool if switch does not turn it on or off. A tool
that cannot be controlled with the switch is dangerous and
must be repaired.
• Disconnect battery pack from tool or place the switch in the
locked or "off" position before making any adjustments,
changing accessories, or storing the tool. Such preventive
safety measures reduce the risk of starting the tool
accidentally.
• Store idle tools out of reach of children and other untrained
persons. Tools are dangerous in the hands of untrained
users.
• 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 sparks, burns, or a fire.
• Check for misalignment or binding of moving parts,
breakage of parts, and any other condition that may affect
the tool’s operation. If damaged, have the tool serviced
before using. Many accidents are caused by poorly
maintained tools.
• Use only impact sockets and accessories that are
recommended by the manufacturer for your model.
Accessories that may be suitable for one tool may create
a risk of injury when used on another tool.
• Impact wrenches are not torque control devices. Fasteners
with specific torque requirements must be checked with
suitable torque measuring devices after installation with an
impact wrench.
• This product may contain one or more chemicals known
to the State of California to cause cancer and birth
defects or other reproductive harm. Wash hands thoroughly
after handling.
• Failure to heed these warnings may result in personal injury
and/or property damage.
FAILURE TO OBSERVE THESE WARNINGS COULD RE SULT IN IN JU RY.
WARNING
MCL1238HPIW, -G, -O, -Y 3 10/12/18
MCL1238HPIW, -G, -O, -Y 12V 3/8" High Power Impact Wrench
Service
• Tool service must be performed only by the MATCO
authorized service centers listed. Service or maintenance
performed by unqualified personnel may result in a risk of
injury. Repair by unqualified personnel, use of unauthorized
parts, and failure to follow maintenance instructions may
create a risk of shock or injury.
SAVE THESE INSTRUCTIONS!
SPECIFIC SAFETY RULES
DO NOT let comfort or familiarity with product replace strict
adherence to cordless product safety rules. If you use this
tool unsafely or incorrectly, you can suffer serious personal
injury.
• Hold tool by insulated gripping surfaces when performing an
operation where the accessories may contact hidden wiring.
Contact with a “live” wire will also make exposed metal parts of
the tool “live” and shock the operator.
• Be aware that this tool is always in operating condition, because it
does not have to be plugged into an electrical outlet.
• Always be sure you have firm footing.
• Be sure no one is below when using the tool in high locations.
• Hold the tool firmly and use both hands.
• Keep hands and hair away from rotating parts.
• Do not leave the tool running. Do not force tool to stay in the “on”
position. Operate the tool only when hand-held.
• Do not touch the impact socket or the workpiece immediately after
operation; they may be extremely hot and could burn your skin.
• Some material contains chemicals which may be toxic. Take
caution to prevent working dust inhalation and skin contact.
Follow material supplier safety data.
WARNING:
MISUSE or failure to follow the safety rules stated in
this instruction manual may cause serious personal
injury.
OPERATING INSTRUCTION
Installing Or Removing Battery Pack
(See Fig.1, Fig.2)
1. Your new battery pack is not fully charged. You may need to
charge it before use.
2. Make sure the switch is in the "off" position before insertion/
removal of a battery pack.
3. To remove a battery pack, depress both tabs on either side of
the battery and pull downward.
4. To insert a battery pack, align the battery with the tool
housing and push battery inward until click indicating battery
is fully installed.
Charging The Battery Pack
1. Battery may not charge when it is above a certain preset
temperature limit. Allow temperature of battery to cool before
charging.
2. The charge process will take less than one hour.
3. After charging, unplug the charger from the power source
and stow away in a safe place.
Tool Operation:
• Always be sure that the tool is switched off and the battery
pack is removed before installing or removing impact sockets.
1. To install an impact socket, firmly push the impact socket onto
the anvil as far as it will go.
2. To remove the impact socket, pull the impact socket from the
anvil.
3. To start the tool, pull the trigger. Release the trigger to stop.
4. For reversing the tool, use the forward/reverse switch located
above the trigger. The direction of the rotation are also shown
on the face of the switch.
5. Always check the direction of rotation before operation.
6. Use the forward/reverse switch only after the tool comes to a
complete stop. Changing the direction of rotation before the
tool stops will cause damage.
7. Hold the tool firmly in place, make sure the impact socket is
completely over the nut or bolt. Apply forward pressure to the
tool to the extent that the impact socket will not slip off the
nut or bolt. Pull the trigger to begin.
NOTE:
• Use the proper impact socket size for the nut or bolt that you
intend to install or remove.
• Hold the tool pointed straight at the nut or bolt. If you tighten
the nut or bolt for a time longer than it needs, the nut or bolt
or impact socket may be overstressed, stripped, damaged,
etc.
When tightening a nut or bolt in a steel plate, the proper
tightening torque can be obtained in an extremely short time
(approx. 0.1-0.2 seconds).
• Turn the tool off as soon as the impact sound is heard.
• When the battery pack is almost completely discharged, the
voltage will drop and the performance will be reduced.
• Impact socket: Failure to use the correct size impact socket
will cause a reduction in the tightening torque.
• Driving a bolt: Even though the torque coefficient and the
class of bolt are the same, the proper tightening torque will
differ according to the diameter of the bolt.
9. Even if the diameter of the bolts is the same, the proper
tightening torque will differ according to the torque
coefficient, the class of the bolt and the bolt length.
10. The manner in which the tool is held or the driving position
of the material to be tightened will affect the torque.
Make sure that the impact wrench is turned off and the
battery pack is removed before carrying out any work on
the tool.
To maintain product safety and reliability, repairs,
maintenance or adjustments should be carried out by an
authorized service center.
Fig. 1
Fig. 2
Fig. 3
MCL1238HPIW, -G, -O, -Y 4 10/12/18
MCL1238HPIW, -G, -O, -Y 12V 3/8" High Power Impact Wrench
1 RS163827 FRONT COVER SCREW 4
2 RS163828 FRONT COVER ASSEMBLY 1
3 RS144IWHO03 RUBBER WASHER 1
4 RS144IWHO04 WASHER 1
5 RS163829 FRONT IMPACT ASSEMBLY 3/8" 1
6 RS163830 WASHER 1
7 RS163831 WASHER 1
8 RS163832 PIN, N3X26.8L 4
9 RS163833 SUB HAMMER 1
10 RS163834 REAR IMPACT ASSEMBLY 1
11 RS163835 WASHER 1
12 RS163836 O-RING 1
13 RS163837 WASHER 1
14 RS144IW006 RING GEAR 1
15 RS144W08 WASHER 1
16 RS144W10 BEARING 1
17 RS163838 RING GEAR HOUSING 1
18 RS163839 O-RING 1
19 RS163840 LED HOLDER 1
20 RS163841 FORWARD / REVERSE ROD 1
21 RS163842 PCB ASSEMBLY & STATOR ASSEMBLY 1
21-1 RS163843 LED 2
21-2 RS163844 BATTERY CONNECTOR ASSEMBLY 1
22 RS163845 MAIN SWITCH ASSEMBLY 1
23 RS163846 ROTOR ASSEMBLY 1
24 RS163847 HOUSING – L&R BURGUNDY 1
25 RS144IW020 HOUSING SCREW 8
26 RS108DD12 HOUSING CLIP 1
NOT SHOWN
RS1238HPIWPLK PRODUCT LABEL KIT 1
RS123847O ORANGE HOUSING – L&R 1
RS123847G GREEN HOUSING – L&R 1
RS123847Y YELLOW HOUSING – L&R 1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
23
24
26
25
22
21-1
21-2
MCL1238HPIW, -G, -O, -Y 5 10/12/18
MCL1238HPIW, -G, -O, -Y 12V 3/8" High Power Impact Wrench
SAVE THESE INSTRUCTIONS!
SAFETY INSTRUCTIONS FOR BATTERY
CHARGER AND BATTERY PACK
DANGER! READ CAREFULLY
120 Volts present at charging terminal. Absolutely DO NOT
probe with conductive objects.
1. CAREFULLY READ AND UNDERSTAND THESE
INSTRUCTIONS
This manual contains critical safety and operating
instructions for the tool, battery charger, and battery.
2. Before using battery charger, read all instructions and
cautionary markings on (1) battery charger, (2) battery,
and (3) product using battery.
3. CAUTION - To reduce risk of injury, charge only MATCO
rechargeable batteries marked on the charger label.
Other types of batteries may burst causing personal
injury and damage.
4. Do not expose charger to rain or snow.
5. Use of an attachment not recommended or sold by Matco
or the battery charger manufacturer may result in a risk of
fire, electric shock, or injury to persons.
6. To reduce risk of damage to electric plug and cord, pull by
plug rather than cord when disconnecting charger.
7. Make sure cord is located so that it will not be stepped on,
tripped over, or otherwise subjected to damage or stress.
8. An extension cord should not be used unless absolutely
necessary. Use of improper extension cord could result in
a risk of fire and electric shock. If extension cord must be
used, make sure:
a. That pins on plug of extension cord are the same
number size, and shape as those of plug on charger;
b. That extension cord is properly wired and in good
electrical condition;
c. That wire size is at least as large as the one specified
in the table below.
Table 1: RECOMMENDED MINIMUM AWG SIZE FOR
EXTENSION CORDS FOR BATTERY CHARGERS
Length of Cord (Feet) 25 50 75 100 150
AWG Size of Cord 18 18 16 14 12
9. Do not operate charger with damaged cord or plug -
replace them immediately.
10. Do not operate charger if it has received a sharp blow,
been dropped, or otherwise damaged in any way;
take it to a MATCO AUTHORIZED service facility.
11. Do not disassemble charger or battery cartridge;
take it to your MATCO AUTHORIZED distributor service
facility. Incorrect reassembly may result in a risk
of electric shock or fire.
12. To reduce risk of electric shock, unplug charger from
outlet before attempting any maintenance or cleaning.
Turning off controls will not reduce this risk.
13. The battery charger is not intended for use by young
children or infirm persons without supervision.
14. Young children should be supervised to ensure that they
do not play with the battery charger.
OPERATIONAL GUIDELINES
FOR BATTERY CHARGER AND
BATTERY PACK
1. Do not attempt to use a step-up transformer, an engine
generator or DC power receptacle.
2. Do not allow anything to cover or clog the charger vents.
3. Always cover the battery terminals with the box or cover
when the battery cartridge is not used.
4. Do not short the battery cartridge:
(1) Do not touch the terminals with any conductive
material.
(2) Avoid storing battery cartridge in a container
with other metal objects such as nails, screws,
coins, etc.
(3) Do not expose battery cartridge to water
or rain. A battery short can cause a large current flow,
overheating, possible burns and even a breakdown.
5. Do not store the tool and Battery Cartridge in locations
where the temperature may reach or exceed
50°C (122°F).
6. Do not incinerate the Battery Pack even if it is
severely damaged or is completely worn out.
The battery cartridge can explode in a fire.
7. Be careful not to drop, shake or strike battery
as it will affect the capacity and may void warranty.
8. Do not charge inside a box or container of any kind.
The charger and battery are ventilated devices and
must NOT be placed next to a heat source or in
exposure to radiating heat.
9. Place charger on a solid and sturdy surface as there are
vents on the bottom side of the charger.
10. Always unplug the charger from the power supply when a
charging sequence is not taking place.
FAILURE TO OBSERVE THESE WARNINGS COULD RE SULT IN IN JU RY.
WARNING
MCL1238HPIW, -G, -O, -Y 6 10/12/18
MCL1238HPIW, -G, -O, -Y 12V 3/8" High Power Impact Wrench
IMPORTANT!
All rechargeable batteries have a finite lifespan and will slowly
lose storage capacity as they age and are cycled. Rechargeable
batteries are consumable items and should be carefully treated
to ensure proper operation during its limited lifespan. Please
read the following guide carefully for tips that may maximize
the performance of your Matco rechargeable batteries. Batteries
should be handled with care and disposed through proper
authorities.
WARNING! MUST READ!
Do not crush or incinerate batteries as it may cause danger
from explosion.
Do not place batteries in confined spaces where it may be
in contact with conductive objects. For example, do not
place battery in pockets, tool boxes, tool bags, etc. with
screws, keys, metal shavings, etc. as the battery may short
circuit and/or cause fire hazard.
Only charge in Matco chargers and never attempt to wire to
alternative charging sources
Danger of explosion, electric shock, fire, and electrocution may
result from:
- Abuse, misuse, and severe shock
- Subjecting the unit to conductive particles, objects,
and liquids
- Connecting two chargers together
- Charging Matco batteries with other chargers
- Using the Matco charger to charge other
batteries
- Operating the charger with a damaged cord or
plug
PROPER CARE WILL MAXIMIZE PRODUCT LIFE
Please note that there are differences in the care of
Lithium-Ion and Nickel-Cadmium batteries.
PROPER CARE FOR MATCO INFINIUM
LITHIUM-ION (LI-ION) BATTERIES
- All Li-ion batteries are sensitive to high temperature and
should be kept cool, dry, and out of direct light exposure. Ideal
temperature range for operation and storage is between 32 and
75 °F. Li-ion batteries may be stored in the refrigerator,
but freezers are not recommended.
- Do not leave batteries unused for extended periods of time,
especially when it is fully charged or fully discharged. Bring a
Li-ion battery to approximately 50% charge level before storing.
- Li-ion batteries are sensitive to shock. Avoid dropping,
hitting, or exposure to vibration.
- Li-ion can be charged frequently and recharged before it
is fully depleted. Li-ion, in fact, is ideally recharged before it
is completely depleted. Recharging when there is 25%-50%
capacity remaining in the battery may prolong its lifespan.
- Contaminants can adversely affect the performance and life
of Li-ion batteries. Minimize the battery’s exposure to dust, dirt,
and small particles.
- Recharge Matco Li-ion batteries only in Matco recharging
devices that are designed specifically for the battery type.
Never subject batteries to any other quick-charging, quick-
discharging, or quick-restoring devices.
MATCO CORDLESS BATTERY USE AND CARE GUIDE
MCL1238HPIW, -G, -O, -Y 7 10/12/18
MCL1238HPIW, -G, -O, -Y 12V 3/8" High Power Impact Wrench
MATCO MCL1238HPIW TOOL
Matco warrants this tool for a period of 2 years to the
consumer. We will repair/replace at our discretion any tool that
is found to be defective during the warranty period. In order
to have your tool repaired, return the tool to any of Matco
authorized warranty centers listed, freight prepaid. Please
include a copy of your proof of purchase and a brief description
of the problem. The tool will be inspected and if any part or
parts are found to be defective Matco will repair/replace under
warranty.
Defective products must be returned and analyzed by VIS Repair
and Service for the United States or HT Pneumatic Rebuilders
for Canada, at the addresses listed below, freight prepaid. Any
tool that has been serviced by the user or by an unauthorized
service center will subsequently void the warranty of the tool.
This warranty does not apply to damage that Matco determines
to be caused from repairs made or attempted by anyone other
than Matco authorized Repair centers. Misuse, abuse, normal
wear and tear, and lack of maintenance do not constitute
warranty.
MATCO 12V LITHIUM-ION
BATTERY MUC12LB, MUC122LB / CHARGER MUC12LC
Matco Tools warrants its 16V Lithium-ion (battery/charger) to
be free from defects in material and workmanship for a period
of (2) years from the original date of purchase. Registration is
required through your local authorized Matco distributor and/
or by submission of completed registration form included
with the product. If the battery/charger should fail within the
warranty period, it must be returned and analyzed by VIS Repair
and Service for the United States or HT Pneumatic Rebuilders
for Canada, at the addresses listed below, freight prepaid. A
battery capacity defect could be defined as the battery no
longer accepting a charge, or holding a charge for the battery
manufacturing specified period as determined by Matco Tools
Repair center. Based on the evaluation, Matco Tools, at their
discretion, will either repair or replace any batteries to be found
defective in material or workmanship at no charge. Please see
Matco Battery Care Guide in the Cordless Operating Manual for
any of the Infinium products. You will find helpful tips that may
maximize the useful life of your battery.
Address for Returns as follows:
VIS Repair and Service
315 Hawkins Rd.
Travelers Rest, SC 29690
(864) 660-8286
HT Pneumatic Rebuilders
22 Goodmark Place Unit #8
Toronto, ON M9W 6R2 Canada
(416) 231-0172
MATCO CORDLESS WARRANTY
