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SKU 31877

For technical questions, please call 1-800-444-3353.

REMOVE ADJUSTING KEYS AND WRENCHES. Make it a habit to check that keys and 

adjusting wrenches are removed from the tool or machine work surface before plugging 

it in.

AVOID UNINTENTIONAL STARTING. Be sure the switch is in the OFF position when 

not in use and before plugging in. Do not carry any tool with your finger on the trigger, 

whether it is plugged in or not.

OUTDOOR EXTENSIONS CORDS. When the equipment is operated outdoors, use 

only extension cords intended or outside use. See chart under “Extension Cords: for the 

proper AWG rating depending on the length of the cord(s) being used.

STAY ALERT. Watch what you are doing, use common sense. Do not operate any tool 

when you are tired.

CHECK DAMAGED PARTS. Before using any tool, any part that appears damaged 

should be carefully checked to determine that it will operate properly and perform its 

intended function. Check for alignment and binding of moving parts; any broken parts or 

mounting fixtures; and any other condition that may affect proper operation. Any part that 

is damaged should be properly repaired or replaced by a qualified technician. Do not use 

the tool if any switch does not turn on and off properly.

GUARD AGAINST ELECTRIC SHOCK. Prevent body contact with grounded surfaces 

such as pipes, radiators, ranges, and refrigerator enclosures.

REPLACEMENT PARTS AND ACCESSORIES. When servicing, use only identical 

replacement parts. Use of any other parts will void the warranty. Only use accessories 

intended for use with this tool. Approved accessories are available from Harbor Freight 

Tools.

DO NOT OPERATE TOOL IF UNDER THE INFLUENCE OF ALCOHOL OR DRUGS. 

Read warning labels on prescriptions to determine if your judgment or reflexes are im

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paired while taking drugs. If there is any doubt, do not operate the tool.

ONLY USE IMPACT SOCKETS. Sockets built for impact wrenches are specifically de

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signed to withstand the force of the delivered blow. Any other socket may shatter, caus-

ing injury to the operator and damage to any nearby equipment.

People with pacemakers should consult their physician(s) before use.  Electromagnetic 

fields in close proximity to heart pacemaker could cause pacemaker interference or 

pacemaker failure.  In addition, people with pacemakers should: 

• Avoid operating alone. 

• Do not use with power switch locked on. 

• Properly maintain and inspect to avoid electrical shock. 

• Any power cord must be properly grounded.  Ground Fault Circuit Interrupter (GFCI) 

should also be implemented – it prevents sustained electrical shock.

Some dust created by power sanding, sawing, grinding, drilling, and other construction 

activities, contains chemicals known [to the State of California] 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 or other masonry products 

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Summary of Contents for 31877

Page 1: ... Oaks Blvd Camarillo CA 93011 Visit our website at http www harborfreight com Read this material before using this product Failure to do so can result in serious injury Save this manual Copyright 1997 by Harbor Freight Tools All rights reserved No portion of this manual or any artwork contained herein may be reproduced in any shape or form without the express written consent of Harbor Freight Tool...

Page 2: ... the safety alert symbol It is used to alert you to potential personal injury hazards Obey all safety messages that follow this symbol to avoid possible injury or death DANGER indicates a hazardous situation which if not avoided will result in death or serious injury WARNING indicates a hazardous situation which if not avoided could result in death or serious injury CAUTION used with the safety al...

Page 3: ...ttempt to force a small tool or attach ment to do the work of a larger industrial tool Do not use a tool for a purpose for which it was not intended DRESS PROPERLY Do not wear loose clothing or jewelry as they can be caught in moving parts Protective electrically non conductive clothes and non skid footwear are recommended when working Wear restrictive hair covering to contain long hair USE EYE AN...

Page 4: ...losures REPLACEMENT PARTS AND ACCESSORIES When servicing use only identical replacement parts Use of any other parts will void the warranty Only use accessories intended for use with this tool Approved accessories are available from Harbor Freight Tools DO NOT OPERATE TOOL IF UNDER THE INFLUENCE OF ALCOHOL OR DRUGS Read warning labels on prescriptions to determine if your judgment or reflexes are ...

Page 5: ...d plug provided with the tool Do not use the tool if the power cord or plug is damaged If damaged have it repaired by a service facility before use If the plug will not fit the outlet have a proper outlet installed by a qualified electrician Double Insulated Tools Tools with Two Prong Plugs Tools marked Double Insulated do not require grounding They have a special double insula tion system which s...

Page 6: ...able for outdoor use Make sure the extension cord is properly wired and in good electrical condition Always replace a damaged extension cord or have it repaired by a qualified electrician before using it Protect the extension cords from sharp objects excessive heat and damp or wet areas RECOMMENDED MINIMUM WIRE GAUGE FOR EXTENSION CORDS 120 240 VOLT NAMEPLATE AMPERES at full load EXTENSION CORD LE...

Page 7: ...ly use socket extensions designed for impact use Pressing the top of the ROCKER SWITCH 6 up will cause the ANVIL 16 to move in a counterclockwise direction This will com monly loosen the fastener Pressing the bottom of the ROCKER SWITCH down will cause the ANVIL to move in a clockwise direction This will commonly tighten the fastener Breaking Loose Fasteners Note This procedure is used when a fast...

Page 8: ...wer tool is damaged it must be replaced only by a qualified service technician Brushes Note Both BRUSHES 3 must be replaced at the same time The BRUSHES must be changed when less than 3 8 remains or when perfor mance noticeably degrades Remove the BRUSH CAP 5 using a large flat head screwdriver Remove the BRUSH and replace Replace the BRUSH CAP Lubrication Note The following procedures should only...

Page 9: ... Part Description Q ty 1 Armature 1 2 Field 1 3 Brush Assembly 2 4 Brush Holder 2 5 Brush Cap 2 6 Switch 1 7 Plug 1 8 Cord 1 9 Ball Bearing 1 10 Ball Bearing 1 11 Bearing Retainer 1 12 Screw 6 13 Gear Case 1 14 Thrust Washer 1 15 Bearing Seal 1 16 Anvil Assembly 1 17 Spring 1 18 Detent Pin 1 19 Impactor 1 20 Steel Ball 25 21 Spring 1 22 Gear Cam 1 23 Steel Ball 2 Part Description Q ty 24 Bearing 1...

Page 10: ...44 3353 ASSEMBLY DIAGRAM Record Product s Serial Number Here Note If product has no serial number record month and year of purchase instead Note Some parts are listed and shown for illustration purposes only and are not available individually as replacement parts ...

Page 11: ...ncidental or consequential damages so the above limitation of exclusion may not apply to you This war ranty is expressly in lieu of all other warranties express or implied including the warranties of merchantability and fitness To take advantage of this warranty the product or part must be returned to us with trans portation charges prepaid Proof of purchase date and an explanation of the complain...

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