Wen 48107 User manual

ELECTRIC
IMPACT WRENCH
Model # 48107
Your new tool has been engineered and manufactured to WEN’s highest standards for dependability, ease
of operation, and operator safety. When properly cared for, this product will supply you years of rugged,
trouble-free performance. Pay close attention to the rules for safe operation, warnings, and cautions. If
you use your tool properly and for its intended purpose, you will enjoy years of safe, reliable service.
IMPORTANT:
NEED HELP? CONTACT US!
Have product questions? Need technical support?
Please feel free to contact us at:
800-232-1195
[email protected]
WENPRODUCTS.COM
(M-F 8AM-5PM CST)
bit.ly/wenvideo
For replacement parts visit
WENPRODUCTS.COM
NOTICE: Please refer to wenproducts.com for the most up-to-date instruction manual.
E190351

TABLE OF CONTENTS
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3
4
6
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9
10
11
12
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PRODUCT SPECIFICATIONS
Model Number:
Motor:
Impact Frequency:
Maximum Torque:
Drive Size:
Product Dimensions:
Product Weight:
48107
AC 120V, 60 Hz, 7.5A, 2100 RPM
2700 impacts per minute
230 ft. lbs
1/2 in.
11.8 x 4 x 9.6 in.
6.9 lbs
Product Specifications
Safety Introduction
General Safety Rules
Impact Wrench Safety Rules
Electrical Information
Know Your Impact Wrench
Operation
Maintenance
Troubleshooting
Exploded View & Parts List
Warranty Statement
2

3
SAFETY INTRODUCTION
Thanks for purchasing the WEN Impact Wrench. We know you are excited to put your tool to work, but first,
please take a moment to read through the manual. This manual provides information regarding potential safety
concerns, as well as helpful assembly and operating instructions. Safe operation of this tool requires that you read
and understand this operator’s manual and all labels affixed to the tool.
SAFETY ALERT SYMBOL: Indicates danger, warning, or caution. The safety symbols and the
explanations with them deserve your careful attention and understanding. Always follow the safety
precautions to reduce the risk of fire, electric shock and personal injury. However, please note that
these instructions and warnings are not substitutes for proper accident prevention measures.
NOTE: The following safety information is not meant to cover all possible conditions and situations that may oc-
cur. WEN reserves the right to change this product and specifications at any time without prior notice.
Keep this manual available to all users during the entire life of the tool and review it frequently
to maximize safety for both yourself and others.

GENERAL SAFETY RULES
4
Read all safety warnings and all instructions. Failure to follow the warnings and instructions may result
in electric shock, fire and serious injury. Save all warnings and instructions for future refer-
ence. The term “power tool” in the warnings refers to your mains-operated (corded) power tool.
WORK AREA SAFETY
a) Keep work area clean and well lit. Cluttered or dark areas invite accidents.
b) 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.
c) Keep children and bystanders away while operating a power tool. Distractions can cause you to lose control.
ELECTRICAL SAFETY
a) 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. Unmodified plugs and matching outlets will reduce risk of electric shock.
b) 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.
c) Do not expose power tools to rain or wet conditions. Water entering a power tool will increase the risk of electric
shock.
d) 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.
e) When operating a power tool outdoors, use an extension cord suitable for outdoor use. Use of a cord suitable for
outdoor use reduces the risk of electric shock.
f) If operating a power tool in a damp location is unavoidable, use a ground fault circuit interrupter (GFCI) pro-
tected supply. Use of a GFCI reduces the risk of electric shock.
PERSONAL SAFETY
a) Stay alert, watch what you are doing and use common sense when operating a power tool. Do not use a power tool
while you are tired or under the influence of drugs, alcohol or medication. A moment of inattention while operating
power tools may result in serious personal injury.
b) Use personal protective equipment. Always wear eye protection. Protective equipment such as dust mask, non-
skid safety shoes, hard hat, or hearing protection used for appropriate conditions will reduce personal injuries.
c) Prevent unintentional starting. Ensure the switch is in the off-position before connecting to power source and/or
battery pack, picking up or carrying the tool. Carrying power tools with your finger on the switch or energising power
tools that have the switch on invites accidents.
d) 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.
e) Do not overreach. Keep proper footing and balance at all times. This enables better control of the power tool
in unexpected situations.

GENERAL SAFETY RULES
f) Dress properly. Do not wear loose clothing or jewelry. Keep your hair, clothing and gloves away from moving
parts. Loose clothes, jewelry or long hair can be caught in moving parts.
g) If devices are provided for the connection of dust extraction and collection facilities, ensure these are connected
and properly used. Use of dust collection can reduce dust-related hazards.
h) Always wear eye protection.
POWER TOOL USE AND CARE
a) 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.
b) 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.
c) Disconnect the plug from the power source and/or the battery pack from the power tool before making any ad-
justments, changing accessories, or storing power tools. Such preventive safety measures reduce the risk of starting
the power tool accidentally.
d) 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 dangerous in the hands of untrained users.
e) 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.
f) Keep cutting tools sharp and clean. Properly maintained cutting tools with sharp cutting edges are less likely to
bind and are easier to control.
g) Use the power tool, accessories and tool bits etc. in accordance with these instructions, 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.
SERVICE
a) Have your power tool serviced by a qualified repair person using only identical replacement parts. This will
ensure that the safety of the power tool is maintained.
CALIFORNIA PROPOSITION 65 WARNING
This product and some dust created by power sanding, sawing, grinding, drilling, and other construction activities
may contain chemicals, including lead, known to the State of California to cause cancer, birth defects, or other re-
productive harm. Wash hands after handling. Some examples of these chemicals are:
• Lead from lead-based paints.
• Crystalline silica from bricks, cement, and other masonry products.
• 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 with approved safety equipment such as dust masks specially de-
signed to filter out microscopic particles.
5

IMPACT WRENCH SAFETY RULES
WARNING: Do not let comfort or familiarity with the product replace strict adherence to product safety
rules. Failure to follow the safety instructions may result in serious personal injury.
1. WORK ENVIRONMENT. Do not operate the tool in wet or damp conditions; doing so significantly increases
the risk of electrical shock. Do not operate the tool in the presence of flammable liquids or gases.
2. PERSONAL SAFETY. Always wear ANSI Z87.1-approved glasses, hearing protection and dust mask when us-
ing the wrench. Tie back long hair. Do not wear loose clothing or jewelry as they might get drawn in by the tool.
3. PREVENTING ELECTRIC SHOCK. Only hold the tool by insulated gripping surfaces when performing an
operation in case the drive contacts hidden wiring or its own cord. Contacting a “live” wire may make exposed
metal parts of the tool “live” and could give the operator an electric shock. Make sure to keep the drive bit away
from any power cables, extension cords or wiring during operation.
4. TOOL INSPECTION. Before operation, check the tool for any damage or missing parts. Do not use the tool
if any part is missing or damaged. Make sure all adjustments are correct and all connections are tight.
5. STANDING POSITION. Always be sure you have a firm footing. When operating the tool from an elevated
position, be aware of people or things beneath you.
6. SECURING THE WORKPIECE. Secure loose workpieces using vises or clamps to prevent wobble, damage
to the workpiece, and personal injury.
7. DURING OPERATION. To prevent injury, use both hands to operate the impact wrench, placing one hand
on the handle and the other hand on the front housing. Keep your hands, hair and other beloved body parts away
from the rotating components of the tool.
8. TURNING OFF THE TOOL. Turn off the tool, and unplug it from its electrical outlet before leaving. Do not
lay the tool down until it has come to a complete stop. Do not touch the bit or the workpiece immediately after
operation. They may be extremely hot and could burn your skin.
9. MAKING ADJUSTMENTS. Always turn off and unplug the impact wrench before making adjustments or
changing attachments. Accidental start-ups may occur if the tool is plugged in during adjustment or maintenance.
10. HOLD POWER TOOL BY INSULATED GRIPPING SURFACES, when performing an operation where
the fastener may contact hidden wiring or its own cord. Fasteners contacting a “live” wire may make exposed
metal parts of the power tool “live” and could give the operator an electric shock.
6

IMPORTANT: Servicing a double-insulated product requires extreme care and knowledge of the system, and
should be done only by a qualified service personnel using identical replacement parts. Always use original factory
replacement parts when servicing.
1. POLARIZED PLUGS. To reduce the risk of electric shock, this equipment has a polarized plug (one blade
is wider than the other). This plug will fit in a polarized outlet only one way. If the plug does not fit fully in the
outlet, reverse the plug. If it still does not fit, contact a qualified electrician to install a proper outlet. DO NOT
modify the machine plug or the extension cord in any way.
2. GROUND FAULT CIRCUIT INTERRUPTER PROTECTION (GFCI) should be provided on the circuit or
outlet used for this power tool to reduce the risk of electric shock.
3. SERVICE AND REPAIR. To avoid danger, electrical appliances must only be repaired by qualified service
technician using original replacement parts.
GUIDELINES AND RECOMMENDATIONS FOR EXTENSION CORDS
When using an extension cord, be sure to use one heavy enough to carry the current your product will draw. An
undersized cord will cause a drop in line voltage resulting in loss of power and overheating. The table below shows
the correct size to be used according to cord length and nameplate ampere rating. When in doubt, use a heavier
cord. The smaller the gauge number, the heavier the cord.
DOUBLE-INSULATED TOOLS
Your impact wrench electrical system is double insulated where two systems of insulation are pro-
vided. This eliminates the need for the usual three-wire grounded power cord. Double insulated tools
do not need to be grounded, nor should a means for grounding be added to the product. All exposed
metal parts are isolated from the internal metal motor components with protecting insulation.
ELECTRICAL INFORMATION
AMPERAGE REQUIRED GAUGE FOR EXTENSION CORDS
25 ft. 50 ft. 100 ft. 150 ft.
7.5A 18 gauge 16 gauge 14 gauge 12 gauge
1. Examine extension cord before use. Make sure your extension cord is properly wired and in good condition.
Always replace a damaged extension cord or have it repaired by a qualified person before using it.
2. Do not abuse extension cord. Do not pull on cord to disconnect from receptacle; always disconnect by pulling on
plug. Disconnect the extension cord from the receptacle before disconnecting the product from the extension cord.
Protect your extension cords from sharp objects, excessive heat and damp/wet areas.
3. Use a separate electrical circuit for your tool. This circuit must not be less than a 12-gauge wire and should be
protected with a 15A time-delayed fuse. Before connecting the motor to the power line, make sure the switch is in
the OFF position and the electric current is rated the same as the current stamped on the motor nameplate. Run-
ning at a lower voltage will damage the motor.
7

KNOW YOUR IMPACT WRENCH
Carefully unpack the tool from the packaging. Check all components and compare against the diagram below. If
any part is damaged or missing, please contact our customer service at [phone], M-F 8-5 CST or email us
at [email protected].
Clockwise Rotation (F for Forward)
Counterclockwise Rotation (R for Reverse)
1/2-Inch Drive
(with Cover)
Carbon Brush Cover
(Left & Right Side)
Handle
POWER & DIRECTIONAL SWITCH
The switch of the impact wrench controls both the power and rotational direction of the drive.
• To run the tool in a clockwise direction, press the lower part of the switch (F for forward).
• To run the tool in a counterclockwise direction, press the upper part of the switch (R for reverse).
• To turn OFF the tool, release the switch.
INSTALLING THE DRIVE BIT
The impact wrench is equipped with a quick-connect drive that accepts 1/2-inch drive bits (not included). To
install the drive bit, first turn OFF and unplug the tool. Remove the plastic cover and slide the drive bit over the
drive until it is secured. Always make sure the bit is securely installed before starting the impact wrench.
8

OPERATION
GENERAL OPERATION
1. Plug your tool into an appropriate power outlet.
2. Hold the tool with both hands, keeping one hand on the handle and the other hand on the front housing.
3. Turn ON the wrench by pressing the corresponding area of the switch for either clockwise (F) or counterclock-
wise (R) rotation.
NOTE: Check the bit rotation before beginning your work.
4. The torque is controlled by the pressure exerted on the power switch. Use the appropriate amount of torque
for the work, but do not force the tool.
NOTE: The amount of actual torque may vary depending on the condition of the threads and other factors. If
tightening critical components, check the actual torque applied to the fastener with a mechanical torque wrench
(not supplied).
WARNING: Do not touch or hold the drive bit during use.
5. When finished with the work, release the power switch. Wait for the tool to come to a complete stop before set-
ting it down. Disconnect its power supply. Follow the instructions on the next page to maintain your tool.
WORK AREA AND WORKPIECE SET UP
1. Designate a work area that is clean and well-lit, away from possible hazards.
2. Safely route the power cord to the tool to avoid exposing the power cord to possible damage or creating a trip-
ping hazard. The power cord must reach the work area with enough extra length to allow free movement while
working.
3. Secure loose workpieces using a vise or clamps (not included) to prevent movement while working. Never hold
a workpiece in your hands or across your legs.
WARNING: To prevent serious injury, make sure all the warnings and instructions have been read and
understood before operating this tool.
9

MAINTENANCE
WARNING: To avoid accidents, always disconnect the tool from the power supply before cleaning or
performing any maintenance. Servicing of the tool must be performed by a qualified technician.
CLEANING AND STORAGE
1. Wipe the tool after every use with a soft cloth or low-pressure compressed air. Do not let water enter the tool.
2. Keep the ventilation openings free from dust and debris to prevent the motor from overheating.
3. Most plastics are susceptible to damage from various types of commercial solvents Do not use any solvents or
cleaning products that could damage the plastic parts. Some of these include but are not limited to: gasoline, carbon
tetrachloride, chlorinated cleaning solvents, ammonia and household detergents that contain ammonia.
4. Store the tool in a clean and dry place away from the reach of children.
Carbon Brush
Length
Carbon Brush
Cover
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PRODUCT DISPOSAL
Used power tools should not be disposed of together with household waste. This product contains electronic com-
ponents that should be recycled. Please take this product to your local recycling facility for responsible disposal and
to minimize its environmental impact.
CARBON BRUSH REPLACEMENT
The wear on the carbon brushes depends on how frequently and how
heavily the tool is used. To maintain maximum efficiency of the motor, we
recommend inspecting the two carbon brushes every 60 hours of operation
or when the tool stops working.
NOTE: Replacement carbon brushes (Part No. 48107-022) can be or-
dered at wenproducts.com. Only genuine WEN replacement brushes
designed specifically for your tool should be used.
1. To access the carbon brushes, remove the carbon brush covers on the
left and right side of the motor housing.
2. Carefully remove the carbon brushes using pliers. Keep track of which
orientation the old carbon brushes were in to prevent needless wear if they
will be reinstalled.
3. Measure the length of the brushes. Replace the brushes if either carbon
brush length is worn down to 3/16 of an inch. Both carbon brushes should
be replaced at the same time.
4. Install the carbon brushes and the carbon brush covers.
NOTE: New carbon brushes tend to spark for a few minutes during the first use as they wear down.

TROUBLESHOOTING
Problem Possible Cause Solution
Motor does not start
Power cord damaged or not
properly plugged in.
Check the power cord, extension cord, power plug and
the power outlet. Do not use the tool if any cord is dam-
aged.
Defective power switch. Stop using the tool and contact customer service at (800)
232-1195, M-F 8-5 CST for assistance.
Insufficient power from power
outlet.
Make sure the outlet is functional and is the right capac-
ity for the tool.
Carbon brushes (Part No.
48107-022) are worn.
Inspect and replace carbon brushes as needed (see page
10) Replacement brushes (48107-022) can be ordered
from wenproducts.com
Defective motor or other inter-
nal damage.
Stop using the tool and contact customer service at (800)
232-1195, M-F 8-5 CST for assistance.
Excessive noise or
vibration Internal damage or wear. Contact customer service at [phone], M-F 8-5 CST for assistance.
Overheating
Tool forced to work too fast. Do not force the tool and let it work at its own pace.
The extension cord is too long
or too thin
See page 7 for selecting the proper size of extension
cord for your tool.
Blocked motor housing vents Blow dust out of the motor housing vents while wearing
safety goggles and dust mask.
Ineffective Perfor-
mance
Drive bits worn or damaged. Replace bits as needed.
Carbon brushes (Part No.
48107-022) are worn.
Inspect and replace carbon brushes as needed (see page
10). Replacement brushes (48107-022) can be ordered
from wenproducts.com
NOTE: Parts that wear down over the course of normal use (like accessories, carbon brushes, etc.) are not covered
by the two-year warranty. Repairs and replacements should only be performed by an authorized technician.
11
WARNING: Stop using the tool immediately if any of the following problems occur. Repairs and replace-
ments should only be performed by authorized personnel. If you have any questions, please contact our
customer service at [phone], M-F 8-5 CST or email us at [email protected].

EXPLODED VIEW & PARTS LIST
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EXPLODED VIEW & PARTS LIST
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No. Part No. Description Qty.
1 48107-001 Plastic Sleeve 1
2 48107-002 Screw ST5x45 4
3 48107-003 Head Housing Assembly 1
3.1 48107-003.1 Head Housing 1
3.2 48107-003.2 Sealing Ring 1
3.3 48107-003.3 Sliding Bearing
Ø32xØ19x21 1
4 48107-004 Shaft Assembly 1
4.1 48107-004.1 Elastic Collar 1
4.2 48107-004.2 Rubber Ring
Ø9.5xØ2 1
4.3 48107-004.3 Shaft 1
5 48107-005 Impact Block Assembly 1
5.1 48107-005.1 Impact Block 1
5.2 48107-005.2 Steel Ball (Roller) 25
5.3 48107-005.3 Washer
Ø33.8xØ43.2x1mm 1
5.4 48107-005.4 Spring 1
5.5 48107-005.5 Steel Ball 2
5.6 48107-005.6 Gear Shaft 1
5.7 48107-005.7 Big Gear Wheel 1
6 48107-006 Washer
Ø8.3xØ17x3mm 1
7 48107-007 Gasket 1
8 48107-008 Cover Assembly 1
8.1 48107-008.1 Sliding Bearing
Ø32xØ8x16mm 1
8.2 48107-008.2 Motor Outer Cover 1
8.3 48107-008.3 Sealing Ring
Ø26.5xØ2 1
8.4 48107-008.4 Bearing
6001Z Ø28xØ12x8 1
No. Part No. Description Qty.
9 48107-009 Washer
Ø17xØ8x1mm 1
10 48107-010 Gear Assembly 1
10.1 48107-010.1 Needle Bearing
Ø12xØ8x10 2
10.2 48107-010.2 Gear 1
11 48107-011 Washer Ø8.4xØ16x0.5 1
12 48107-012 Motor Inner Cover 1
13 48107-013 Self Tapping Screw
ST4x60 2
14 48107-014 Stator 1
15 48107-015 Rotor 1
16 48107-016 Deep-Groove
Ball Bearing Ø19xØ7x6 1
17 48107-017 Bearing Sleeve 1
18 48107-018 Wire 2
19 48107-019 Front Housing 1
20 48107-020 Brush Cover 2
21 48107-021 Brush Holder 2
22 48107-022 Carbon Brush 2
23 48107-023 Switch 1
24 48107-024 Terminal 2
25 48107-025 Cord Clamp 1
26 48107-026 Self Tapping Screw
ST4x14 2
27 48107-027 Lead Wire 1
28 48107-028 Handle Back Housing 1
29 48107-029 Self Tapping Screw
ST4x18 2
30 48107-030 Trigger 1
31 48107-031 Cord Sleeve 1
32 48107-032 Power Cord With Plug 1

LIMITED TWO YEAR WARRANTY
WEN Products is committed to build tools that are dependable for years. Our warranties are consistent with this
commitment and our dedication to quality.
LIMITED WARRANTY OF WEN CONSUMER POWER TOOLS PRODUCTS FOR HOME USE
GREAT LAKES TECHNOLOGIES, LLC (“Seller”) warrants to the original purchaser only, that all WEN con-
sumer power tools will be free from defects in material or workmanship for a period of two (2) years from date of
purchase. Ninety days for all WEN products, if the tool is used for professional use.
SELLER’S SOLE OBLIGATION AND YOUR EXCLUSIVE REMEDY under this Limited Warranty and,
to the extent permitted by law, any warranty or condition implied by law, shall be the repair or replacement of
parts, without charge, which are defective in material or workmanship and which have not been misused, carelessly
handled, or misrepaired by persons other than Seller or Authorized Service Center. To make a claim under this
Limited Warranty, you must make sure to keep a copy of your proof of purchase that clearly defines the Date of
Purchase (month and year) and the Place of Purchase. Place of purchase must be a direct vendor of Great Lakes
Technologies, LLC. Third party vendors such as garage sales, pawn shops, resale shops, or any other secondhand
merchant void the warranty included with this product. Contact [email protected] or 1-800-232-1195
to make arrangements for repairs and transportation.
When returning a product for warranty service, the shipping charges must be prepaid by the purchaser. The prod-
uct must be shipped in its original container (or an equivalent), properly packed to withstand the hazards of ship-
ment. The product must be fully insured with a copy of the warranty card and/or the proof of purchase enclosed.
There must also be a description of the problem in order to help our repairs department diagnose and fix the issue.
Repairs will be made and the product will be returned and shipped back to the purchaser at no charge.
THIS LIMITED WARRANTY DOES NOT APPLY TO ACCESSORY ITEMS THAT WEAR OUT FROM
REGULAR USAGE OVER TIME INCLUDING BELTS, BRUSHES, BLADES, ETC.
ANY IMPLIED WARRANTIES SHALL BE LIMITED IN DURATION TO TWO (2) YEARS FROM DATE
OF PURCHASE. SOME STATES IN THE U.S., SOME CANADIAN PROVINCES DO NOT ALLOW LIM-
ITATIONS ON HOW LONG AN IMPLIED WARRANTY LASTS, SO THE ABOVE LIMITATION MAY
NOT APPLY TO YOU.
IN NO EVENT SHALL SELLER BE LIABLE FOR ANY INCIDENTAL OR CONSEQUENTIAL DAM-
AGES (INCLUDING BUT NOT LIMITED TO LIABILITY FOR LOSS OF PROFITS) ARISING FROM
THE SALE OR USE OF THIS PRODUCT. SOME STATES IN THE U.S. AND SOME CANADIAN PROV-
INCES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUEN-
TIAL DAMAGES, SO THE ABOVE LIMITATION OR EXCLUSION MAY NOT APPLY TO YOU.
THIS LIMITED WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, AND YOU MAY ALSO HAVE
OTHER RIGHTS WHICH VARY FROM STATE TO STATE IN THE U.S., PROVINCE TO PROVINCE
IN CANADA AND FROM COUNTRY TO COUNTRY.
THIS LIMITED WARRANTY APPLIES ONLY TO PORTABLE ELECTRIC TOOLS, BENCH POWER
TOOLS, OUTDOOR POWER EQUIPMENT AND PNEUMATIC TOOLS SOLD WITHIN THE UNIT-
ED STATES OF AMERICA, CANADA AND THE COMMONWEALTH OF PUERTO RICO. FOR WAR-
RANTY COVERAGE WITHIN OTHER COUNTRIES, CONTACT THE WEN CUSTOMER SUPPORT
LINE.
14

THANKS FOR
REMEMBERING