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SKU 91790

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

Operation

1.

Prior to use, be sure that your vehicle or other work object is safely secured in

preparation for maintenance.

2.

This tool operates on 24 volts DC. This power level is commonly available from

the battery of large transport trucks and other vehicles. Do not attempt to use
this tool with any other voltage.

3.

When it is safe to do so, connect the RED clamp of this tool to the POSITIVE

terminal of a 24 volt battery. Connect the BLACK clamp of this tool to a clean
grounded part of the vehicle such as the engine block or frame member.

NOTE: If the engine is left running while performing this operation, be sure to avoid
placing your hands, clothes, hair or any other appendage in close proximity to the
moving parts of the engine. The engine should only be run in an open, well-ventilated
place.

WARNING: Working around vehicle engines whether running or not is inherently dan-
gerous, and extraordinary precautions outside the scope of this booklet are required.
Refer to the owners’ manual of your vehicle for more information.

Impact Wrench, with 8” Extension and Impact Socket Installed

4.

NOTE: Unlike air-operated or 120V AC impact wrenches, this

wrench will build up inertia before striking a blow. This is
normal, and DOES NOT INDICATE A PROBLEM.

5.

Make sure the vehicle is parked safely away from all other moving traffic. Be

sure the vehicle is parked on a flat, dry, level surface. Be sure the vehicle is out
of gear (in Neutral), the vehicle’s emergency brake is set, and the tires have
wheel blocks preventing movement.

Summary of Contents for 91790

Page 1: ...TIONS 3491 Mission Oaks Blvd Camarillo CA 93011 Visit our Web site at http www harborfreight com Copyright 2004 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 and replacement parts please call 1 800 444 3353 91790 ...

Page 2: ...ea conditions Do not use machines or power 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 lo...

Page 3: ...tery 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 Avoid unintentional starting Be sure the trigger is released when not in use and before connecting to the battery Do not carry any tool with your finger on the trigger whether or not it is connected 13 Stay alert Watch what you ...

Page 4: ...mity to a heart pacemaker could cause interference to or failure of the pacemaker 21 24 V systems only This unit should only be powered by 24 Volt DC systems Warning The warnings cautions and instructions discussed in this instruction manual cannot cover all possible conditions and situations that may occur It must be understood by the operator that common sense and caution are fac tors which cann...

Page 5: ...oid placing your hands clothes hair or any other appendage in close proximity to the moving parts of the engine The engine should only be run in an open well ventilated place WARNING Working around vehicle engines whether running or not is inherently dan gerous and extraordinary precautions outside the scope of this booklet are required Refer to the owners manual of your vehicle for more informati...

Page 6: ...tern moving around the wheel 9 Occasionally you will have to manually break a nut loose before you can re move it with the Impact Wrench To do so use a Breaker Bar not included and Socket to break the nut loose Then proceed as discussed in item 9 above 10 Replace the wheel on the vehicle hub aligning the wheel studs with the bolt holes in the wheel 11 Install the wheel lug nuts following the vehic...

Page 7: ... t h g i a r t S 1 7 r e v o C r a e R 1 8 2 g n i r a e B 1 8 r e g g i r T 1 9 2 t f a h S e v i r D 1 9 w e r c S 2 0 3 g n i r a e B 1 0 1 r e d l o H e l b a C 1 1 3 e v e e l S 1 1 1 r o t c e t o r P e l b a C 1 2 3 r o t c e t o r P e v e e l S 1 2 1 p m a l C 2 3 3 5 6 x 5 M w e r c S 2 3 1 g n i r a e B 1 4 3 r e h s a W g n i r p S 2 4 1 r o t o R 1 5 3 t u N 2 5 1 r o t a t S 1 6 3 r e...

Page 8: ... THE BUYER THAT HE OR SHE IS QUALIFIED TO MAKE ANY REPAIRS TO THE PRODUCT OR THAT HE OR SHE IS QUALIFIED TO REPLACE ANY PARTS OF THE PRODUCT IN FACT THE MANUFACTURER AND OR DISTRIBUTOR EXPRESSLY STATES THAT ALL REPAIRS AND PARTS REPLACEMENTS SHOULD BE UNDERTAKEN BY CERTIFIED AND LICENSED TECH NICIANS AND NOT BY THE BUYER THE BUYER ASSUMES ALL RISK AND LIABILITY ARISING OUT OF HIS OR HER REPAIRS TO...

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