Milwaukee M18™ Impact Wrenches and Impact Driver Operator's Manual

Introduction

This manual provides essential safety warnings, operating instructions, maintenance procedures, and specifications for the Milwaukee M18™ Impact Wrenches and Impact Driver. It is crucial to read and understand this manual before operating the tool to reduce the risk of injury.

General Power Tool Safety Warnings

Work Area Safety

• Keep work area clean and well lit. Cluttered or 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 children and bystanders away while operating a power tool. Distractions can cause you to lose control.

Electrical Safety

• 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.
• 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.
• Do not expose power tools to rain or wet conditions. Water entering a power tool will increase the risk of electric shock.
• 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.
• 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.
• If operating a power tool in a damp location is unavoidable, use a ground fault circuit interrupter (GFCI) protected supply. Use of an GFCI reduces the risk of electric shock.

Personal Safety

• 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.
• Use personal protective equipment. Always wear eye protection. Protective equipment such as a dust mask, non-skid safety shoes, hard hat or hearing protection used for appropriate conditions will reduce personal injuries.
• 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 energizing power tools that have the switch on invites accidents.
• 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.
• Do not overreach. Keep proper footing and balance at all times. This enables better control of the power tool in unexpected situations.
• Dress properly. Do not wear loose clothing or jewelry. Keep your hair and clothing away from moving parts. Loose clothes, jewelry or long hair can be caught in moving parts.
• 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.
• Do not let familiarity gained from frequent use of tools allow you to become complacent and ignore tool safety principles. A careless action can cause severe injury within a fraction of a second.

Power Tool Use and Care

• 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.
• 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.
• Disconnect the plug from the power source and/ or remove the battery pack, if detachable, from the power tool before making any adjustments, changing accessories, or storing power tools. Such preventive safety measures reduce the risk of starting the power tool accidentally.
• 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.
• Maintain power tools and accessories. 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.
• Keep cutting tools sharp and clean. Properly maintained cutting tools with sharp cutting edges are less likely to bind and are easier to control.
• 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.
• Keep handles and grasping surfaces dry, clean and free from oil and grease. Slippery handles and grasping surfaces do not allow for safe handling and control of the tool in unexpected situations.

Battery Tool Use and Care

• Recharge only with the charger specified by the manufacturer. A charger that is suitable for one type of battery pack may create a risk of fire when used with another battery pack.
• Use power tools only with specifically designated battery packs. Use of any other battery packs may create a risk of injury and fire.
• 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 fire.
• Under abusive conditions, liquid may be ejected from the battery; avoid contact. If contact accidentally occurs, flush with water. If liquid contacts eyes, additionally seek medical help. Liquid ejected from the battery may cause irritation or burns.
• Do not use a battery pack or tool that is damaged or modified. Damaged or modified batteries may exhibit unpredictable behavior resulting in fire, explosion or risk of injury.
• Do not expose a battery pack or tool to fire or excessive temperature. Exposure to fire or temperature above 265°F (130°C) may cause explosion.
• Follow all charging instructions and do not charge the battery pack or tool outside the temperature range specified in the instructions. Charging improperly or at temperatures outside the specified range may damage the battery and increase the risk of fire.

Service

• 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.
• Never service damaged battery packs. Service of battery packs should only be performed by the manufacturer or authorized service providers.

Specific Safety Rules for Impact Wrenches/Impact Driver

• Hold power tool by insulated gripping surfaces, when performing an operation where the fastener may contact hidden wiring. Fasteners contacting a "live" wire may make exposed metal parts of the power tool "live" and could give the operator an electric shock.
• Wear ear protectors. Exposure to noise can cause hearing loss.
• Keep hands away from all cutting edges and moving parts.
• WARNING: To reduce the risk of injury, when working in dusty situations, wear appropriate respiratory protection or use an OSHA compliant dust extraction solution.
• Always use common sense and be cautious when using tools. It is not possible to anticipate every situation that could result in a dangerous outcome. Do not use this tool if you do not understand these operating instructions or you feel the work is beyond your capability; contact Milwaukee Tool or a trained professional for additional information or training.
• Maintain labels and nameplates. These carry important information. If unreadable or missing, contact a MILWAUKEE service facility for a free replacement.
• WARNING: Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to cause cancer, birth defects or other reproductive harm. Some examples of these chemicals are: lead from lead-based paint; crystalline silica from bricks and cement and other masonry products; and arsenic and chromium from chemically-treated lumber. 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.

Specifications

Recommended Ambient Operating Temperature: 0°F to 125°F (-18°C to 50°C)

Functional Description

The tool includes:

• 1. Handle
• 2. Trigger
• 3. Control Switch
• 4. Drive Shank
• 5. Hex Drive (Model 2665-20)
• 6. Square Drive with Pin Detent (Model 2662-20)
• 7. Square Drive with Hog Ring (Models 2663-20, 2664-20)

Pictography:

• V: Volts
• ⚡: Direct Current
• no XXXX min¹: No Load Revolutions per Minute (RPM)
• n XXXX min¹: Impacts per Minute Under Load (IPM)
• ✅: UL Listing Mark for Canada and U.S.

Assembly

Battery Insertion/Removal

To remove the battery, push the release buttons and pull the pack away. To insert, slide the pack into the tool body until it latches securely.

WARNING: Always remove the battery pack before changing or removing accessories.

Tool Hanger

To attach: remove top gear case screws, place ring through hanger, position hanger over screw holes, replace screws. To remove, reverse the procedure.

WARNING: Use only sockets and accessories specifically designed for impact wrenches and drivers.

Accessory Attachment/Removal

For Cat. No. 2662-20: Use appropriate size Square Drive Sockets. Align socket hole with detent pin on drive shank, push socket on. Detent pin snaps into place. To remove, insert nail/object into hole to press detent pin and pull accessory off.

For Cat. No. 2663-20, 2664-20: Use appropriate size Square Drive Sockets. Align accessory with drive shank and push firmly over retaining ring. To remove, pull accessory off drive shank.

For Cat. No. 2665-20: This driver uses 7/16" hex shank bits with ball detent recess. Pull ring out, insert accessory shank, release ring. May need to pull bit slightly to engage. To remove, pull ring out, remove accessory, release ring.

Operation

WARNING: Always wear ANSI Z87.1 compliant eye protection. Use appropriate respiratory protection in dusty situations.

WARNING: Always remove battery pack before changing accessories. Use only recommended accessories.

Using Control Switch

The control switch has three positions: forward, reverse, and lock. It can only be adjusted when the trigger is not pressed and the motor has stopped.

1. Forward (Clockwise): Push switch from the right side. Verify direction.
2. Reverse (Counterclockwise): Push switch from the left side. Verify direction.
3. Lock: Push switch to the center position. Trigger will not operate.

Always remove the battery pack before maintenance or changing accessories. Always lock the trigger or remove the battery pack before storing the tool.

Starting, Stopping, and Controlling Speed

Tools operate from 0 to full speed.

1. Start: Grasp handle firmly and pull trigger.
2. Vary Speed: Increase/decrease pressure on the trigger.
3. Stop: Release trigger. Ensure tool has stopped completely before laying it down.

Impacting Techniques

Longer impact time results in tighter fastening. Avoid excessive impacting to prevent damage to fasteners or workpieces. Be careful with smaller fasteners. Practice to find optimal impact time for desired torque. Check tightness with a hand-torque wrench. Oil, dirt, rust, or other matter on threads affects tightness. Loosening torque is typically 75-80% of tightening torque. For light gasket jobs, use light torque and finish with a hand torque wrench.

Maintenance

WARNING: Always unplug the charger and remove the battery pack before performing maintenance. Never disassemble the tool, battery pack, or charger. Contact a MILWAUKEE service facility for all repairs.

Maintaining Tool

Adopt a regular maintenance program. Inspect for undue noise, misalignment, binding, broken parts, or other issues affecting operation. Return to a MILWAUKEE service facility for repair. After 6 months to 1 year, return for inspection.

If the tool does not start or operate at full power with a charged battery, clean battery contacts. If issues persist, return the tool, charger, and battery pack to a MILWAUKEE service facility.

WARNING: Never immerse the tool, battery pack, or charger in liquid.

Cleaning

Clean dust/debris from vents. Keep handles clean, dry, and free of oil/grease. Use mild soap and a damp cloth. Avoid solvents harmful to plastics.

Repairs

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

Accessories

WARNING: Use only recommended accessories. Others may be hazardous.

For a complete accessory list, visit www.milwaukeetool.com or contact a distributor.

Service - United States

1-800-SAWDUST (1.800.729.3878)

Monday-Friday, 7:00 AM - 6:30 PM CST

www.milwaukeetool.com

Contact Corporate After Sales Service Technical Support for technical, service/repair, or warranty questions.

Email: metproductsupport@milwaukeetool.com

Service - Canada

Milwaukee Tool (Canada) Ltd

1.800.268.4015

Monday-Friday, 7:00 AM - 4:30 PM CST

www.milwaukeetool.ca

Limited Warranty - USA & Canada

Milwaukee electric tools are warranted against defects in material and workmanship for five (5) years from the date of purchase, with certain exceptions. Return the tool to a MILWAUKEE factory Service Center or Authorized Service Station, freight prepaid and insured, with proof of purchase. Warranty does not cover damage from unauthorized repairs, misuse, alterations, abuse, normal wear and tear, lack of maintenance, or accidents. Normal wear parts (chucks, brushes, cords, etc.) are not covered. Specific exceptions apply to certain product categories (e.g., air nailers, battery packs, generators, etc.). Specific warranty periods apply to radios, M12™/M18™ power sources, fans, work carts (1 year); M18 FUEL™ impact wrenches, drain cleaning tools, laser levels (2 years); M18™ heat gun, dust extractor, framing nailers, M18 FUEL™ impact wrenches, compressors, M12™ laser levels (3 years). LED lights have a lifetime warranty. Warranty registration is not required; manufacturing date is used if proof of purchase is unavailable. Acceptance of exclusive repair/replacement remedies is a condition of purchase. Milwaukee is not liable for incidental, special, consequential, or punitive damages. Implied warranties are limited to the duration of the express warranty. This warranty applies to products sold in the U.S.A. and Canada only.

For service, locate nearest facility via www.milwaukeetool.com or 1.800.SAWDUST.

Multilingual Content Notes

This document contains safety, operation, and warranty information in English, French, and Spanish. The primary language for this HTML output is English, with references to the presence of other languages.

• French Safety Rules (Page 6-7): Covers general safety, work area, electrical, personal safety, use/care, battery use/care, maintenance, and specific rules for impact wrenches/drivers. Includes warnings about dust and chemicals.
• Spanish Safety Warnings (Page 11-12): Covers general safety, work area, electrical, personal safety, use/care, battery use/care, maintenance, and specific rules for impact wrenches/drivers. Includes warnings about dust and chemicals.
• French/Spanish Specifications (Pages 8, 13): Mirror the English specification table.
• French/Spanish Functional Description (Pages 8, 13): Correspond to the English functional description and diagrams.
• French/Spanish Assembly (Pages 8, 13, 14): Detail assembly procedures for battery, tool hanger, and accessories.
• French/Spanish Operation (Pages 9, 14): Describe control switch, starting/stopping, speed control, and impacting techniques.
• French/Spanish Maintenance (Pages 7, 9, 14, 15): Cover maintenance, cleaning, and repairs.
• French/Spanish Accessories (Pages 5, 10, 15): Provide information on accessories.
• French/Spanish Service & Warranty (Pages 5, 10, 15, 16): Include service contacts and warranty details, with specific warranty policies for Mexico, Central America, and the Caribbean.

Service Parts List

This section provides a detailed parts list and diagrams for servicing the tool. The primary language is English.

Catalog No. 2663-20

Diagram Description: An exploded view diagram shows the internal and external components of the cordless 18V 1/2" Square Impact Wrench. Components are numbered and keyed to a parts list.

Lubrication

Use Type 'Z' Grease (No. 49-08-7655): Lightly coat the I.D. of the Ring Gear (20) and the center of the three Planet Gears (21) with grease. Place a dab of grease in ball grooves of the Cam Shaft (19). Lightly coat the front washer surface of Anvil (9) with grease, place a dab in the Ball hole on the backside of Anvil. Coat outside grooves of Bushing (2) with grease.

Brush Card Assembly Diagram Description

The diagram shows the Brush Card Assembly, indicating the Brush Shunt (4 places), Right Brush Spring (2x), Carbon Brush (4x), and Left Brush Spring (2x). It provides instructions on ensuring the carbon brush is correctly seated and how to place the brush spring. A NOTE advises pulling carbon brushes partially back during armature assembly/disassembly to prevent damage. It also illustrates the correct and incorrect ways to install the spring.

Wiring Diagram Description

A detailed internal view of the tool (Model 2665-20 shown) illustrates the placement of the Field, On-Off Switch, PCBA, and Battery Terminal Connector Block. It highlights wire traps or guides and provides a NOTE about not overtightening a specific screw. A close-up shows the Red Wire connection from the switch to the left brush card position ('L') and the Black Wire from the switch to the right brush card position ('R').