Harbor Freight Tools 37730 User Manual
3/8” 3/8”
3/8”
3/8” 3/8”
Air Impact Wrench Air Impact Wrench
Air Impact Wrench
Air Impact Wrench Air Impact Wrench
ButterflyButterfly
Butterfly
ButterflyButterfly
37730
ASSEMBLY AND OPERATING INSTRUCTIONS
3491 Mission Oaks Blvd., Camarillo, CA 93011
Visit our W eb site at http://www.harborfreight.com
Copyright © 2004 by Harbor Freight Tools®. All rights reserved. No por tion 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 and replacement parts, please call 1-800-444-3353
Specifications
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This compact Impact Wrench allows you to get at fasteners in much tighter spots
than conventional “pistol” designed air impact wrenches. It delivers a powerful 50ft/
lbs of torque at 90 PSI, at up to 1580 impacts per minute. It uses standard 1/4” npt
air connections, and a convenient 3/8” driv e. The Butterfly switch on top of the tool
allows you to quickly and easily change impact direction. The built in regulator
allows you to instantly change air pressure and torque among 8 settings. Sturdily
built with a polished aluminum body and machined steel components, it is a
versatile tool you will be proud to have in your tool box.
Save This Manual
You will need the manual for the safety w arnings and precautions, assembly
instructions, operating and maintenance procedures, parts list and diagram. K eep
your invoice with this man ual. Write the invoice number on the inside of the front
cover. Keep the manual and inv oice in a safe and dry place for future reference .
Safety Warnings and Precautions
WARNING: When using tool, basic safety precautions should always be followed to reduce the risk of personal injury and damage to equipment.
Read all instructions before using this tool!
1. Keep work area clean . Cluttered areas invite injuries.
2. Observe work area conditions. Do not use machines or po w er tools in
damp or wet locations. Don’t expose to rain. Keep work area well lit. Do not
use electrically powered tools in the presence of flammable gases or liquids.
3. Keep children away . Children must never be allowed in the work area. Do
not let them handle machines, tools, or extension cords .
4. Store idle equipment. When not in use, tools must be stored in a dry
location to inhibit rust. Always lock up tools and keep out of reach of children.
SKU 37730 Page 2
5. Use the right tool for the job. Do not attempt to f orce a small tool or
attachment to do the work of a larger industrial tool. There are certain
applications for which this tool was designed. It will do the job better
and more safely at the rate for which it was intended. Do not modify this
tool and do not use this tool for a purpose for which it was not intended.
6. Dress properly while working. 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 .
7. Use eye, face and ear protection. Always wear ANSI approved impact
safety goggles. Wear a full face shield if you are producing metal filings or
wood chips. W ear an ANSI approved dust mask or respirator when working
around metal, wood, and chemical dusts and mists. Wear ANSI appro ved ear
plugs.
8. Do not overreach. Keep proper footing and balance at all times. Do not
reach over or across running machines.
9. Maintain tools with care. Keep tools clean and in good condition for better
and safer performance. Follow instructions for lubricating and changing
accessories. Inspect tool fittings and hoses periodically 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.
10. Disconnect power. Disconnect from air pressure source when not in use.
11. Remove adjusting keys and wrenches. Check that keys and adjusting
wrenches are removed from the tool or machine work surface before
connecting it.
12. Av oid unintentional starting. Be sure the Butterfly Throttle Switch is in the
neutral, OFF position when not in use and before attaching to pressure
source. Do not carry any tool with your finger on the Butterfly Throttle Switch,
whether it is attached or not.
13. Stay alert. W atch what you are doing, use common sense. Do not oper ate
any tool when you are tired.
14. Check for 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. Chec k 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 the Butterfly Throttle Switch does not function properly.
SKU 37730 Page 3
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