Harbor Freight Tools 31877 User Manual
½” ELECTRIC IMPACT WRENCH
Model
31877
SET UP AND OPERATING INSTRUCTIONS
Diagrams within this manual may not be drawn proportionally.
Due to continuing improvements, actual product may differ slightly from the product described herein.
Distributed exclusively by Harbor Freight Tools®.
3491 Mission 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 Tools.
For technical questions or replacement parts, please call 1-800-444-3353.
Manual Revised 07i
SAVE THIS MANUAL
Keep this manual for the safety warnings and precautions, assembly, operating, inspection, maintenance and cleaning procedures. Write the product’s serial number in the back of the
manual near the assembly diagram (or month and year of purchase if product has no number).
Keep this manual and the receipt in a safe and dry place for future reference.
IMPORTANT SAFETY INFORMATION
In this manual, on the labeling, and all other information
provided with this product:
This is 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,
DANGERDANGER
WARNINGWARNING
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.
CAUTIONCAUTION
NOTICENOTICE
CAUTIONCAUTION
CAUTION, used with the safety alert symbol,
indicates a hazardous situation which, if not
avoided, could result in minor or moderate
injury.
NOTICE is used to address practices not related
to personal injury.
CAUTION, without the safety alert symbol,
is used to address practices not related to
personal injury.
Page 2SKU 31877 For technical questions, please call 1-800-444-3353.
GENERAL SAFETY RULES
WARNING! Read all instructions
Failure to follow all instructions listed below may result in electric shock,
re, and/or serious injury. The term “power tool” in all of the warnings listed
below refers to your line-operated (corded) power tool or battery-operated
(cordless) power tool.
SAVE THESE INSTRUCTIONS
1.
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8.
KEEP WORK AREA CLEAN. Cluttered areas invite injuries.
OBSERVE WORK AREA CONDITIONS. Do not use machines or power tools in damp,
wet, or poorly lit locations. Don’t expose to rain. Keep work area well lit. Do not use elec-
trically powered tools in the presence of ammable gases or liquids.
KEEP CHILDREN AWAY. Children must never be allowed in the work area. Do not let
them handle machines, tools, or extension cords.
STORE IDLE EQUIPMENT. When not in use, tools must be locked up in a dry location to
inhibit rust. Always lock up tools and keep out of reach of children.
DO NOT FORCE THE TOOL. It will do the job better and more safely at the rate for
which it was intended. Do not use inappropriate attachments in an attempt to exceed the
tool’s capacities.
USE THE RIGHT TOOL FOR THE JOB. Do not attempt 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 AND EAR PROTECTION. Always wear ANSI-approved chemical splash gog-
gles when working with chemicals. Always wear ANSI-approved impact safety goggles
at other times. Wear a full face shield if you are producing metal lings or wood chips.
Wear and ANSI approved dust mask or respirator when working around metal, wood,
and chemical dusts and mists.
9.
10.
11.
12.
DO NOT ABUSE THE POWER CORD. Do not yank it to disconnect it from the recep-
tacle. Do not carry tools by the cord.
DO NOT OVERREACH. Keep proper footing and balance at all times. Do not reach over
or across running machines.
MAINTAIN TOOLS WITH CARE. Keep tools sharp and clean for better and safer perfor-
mance. Follow instructions for lubricating and changing accessories. Inspect tool cords c
and, if damaged, have them repaired by an authorized technician. The handles must be
kept clean, dry, and free from oil and grease at all times.
DISCONNECT POWER. Unplug when not in use, before servicing, and when changing
accessories.
Page 3SKU 31877 For technical questions, please call 1-800-444-3353.
13.
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.
14.
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17.
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19.
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 nger 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 xtures; and any other condition that may affect proper operation. Any part that
is damaged should be properly repaired or replaced by a qualied 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.
20.
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23.
DO NOT OPERATE TOOL IF UNDER THE INFLUENCE OF ALCOHOL OR DRUGS.
Read warning labels on prescriptions to determine if your judgment or reexes are im-
paired while taking drugs. If there is any doubt, do not operate the tool.
ONLY USE IMPACT SOCKETS. Sockets built for impact wrenches are specically de-
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
elds 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
Page 4SKU 31877 For technical questions, please call 1-800-444-3353.
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