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SKU 91790

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

6.

Select the appropriate size socket to fit the wheel lug nut. If necessary, install

an extension. Attach the extension and socket to the Impact Wrench by press-
ing them on to the Drive Shaft (29).

7.

Position an appropriate lift (not included) under the lift point for each wheel to be

removed. (Follow the vehicle and lift manufacturer’s instructions for doing so.)
Lift the vehicle until the wheel is off the ground, and support the vehicle se-
curely.

8.

The Impact Wrench is reversible.  To operate the Impact Wrench in a forward

(tightening) direction, squeeze the lower half of the Trigger (8) while holding the
tool securely in your hands. To operate the Impact Wrench in reverse direction,
squeeze the upper half of the Trigger (8) while holding the tool securely in your
hands.  Using the Impact Wrench in reverse, remove the wheel lug nuts accord-
ing to the manufacturer’s recommendations. (In most cases, the manufacturer
will recommend that you remove the lugs in an alternate pattern, 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 vehicle manufacturer’s recommenda-

tions.  Thread the nuts on by hand first before using the Impact Wrench to avoid
cross-threading them.  Be sure to adhere to the vehicle manufacturer’s recom-
mended torque requirements for tightening the lug nuts.

12. When the wheel is securely refastened, use a torque wrench (not included) to

check the torque on all bolts and ensure that the tightness meets the
manufacturer’s recommendations.  Lower the vehicle, disconnect the tool and
replace the lift and the Impact Wrench to their storage places.

Maintenance

1.

When not in use, store your Impact Wrench and its accessories in its case, in

a secure, dry place. Protect it from water, moisture, oil, fuel, grease or other
foreign materials which may damage the case, moving parts, or electrical
components.

2.

This tool should only be repaired by a qualified technician.

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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