U.S. General 91039 Assembly And Operating Instructions Manual
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U.S. General 91039 Assembly And Operating Instructions Manual

3,000 lbs. capacity lightweight aluminum racing jack
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3,000 lbs. capacity
lightweight aluminum
assembly and Operating instructiOns
read this material before using this product.
Failure to do so can result in serious injury.
saVe this manual.
Copyright
2003 by Harbor Freight Tools
©
contained herein may be reproduced in any shape or form without the express written consent of Harbor Freight
Tools. Diagrams within this manual may not be drawn proportionally. Due to continuing improvements, actual
product may differ slightly from the product described herein. Tools required for assembly and service may not
be included.
For technical questions or replacement parts, please call 1-800-444-3353.
Revised Manual 10d
racing jack
model
Visit our website at: http://www.harborfreight.com
. All rights reserved. No portion of this manual or any artwork
®
91039

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MIKE LEAHY
July 18, 2025

my unit will not lift

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MIKE LEAHY
July 18, 2025

my lift will not lift what can I check

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Summary of Contents for U.S. General 91039

  • Page 1 3,000 lbs. capacity lightweight aluminum racing jack model 91039 assembly and Operating instructiOns 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 2003 by Harbor Freight Tools .

  • Page 2: Specifications

    Do not overreach. Keep proper footing and balance at all times. Do not reach over or across running machines. REV 05j, 10a, 10d SKU 91039 Page 2...
  • Page 3 Vehicle Lift Points. Read the vehicle manual to find the proper lifting points for the vehicle. Never attempt to use the Jack unless it is properly filled with hydraulic fluid. (see Maintenance Section, page 5) SKU 91039 Page 3 REV 04f...

  • Page 4: Handle Assembly

    Pump the Handle up and down until the Saddle (40) just touches the item being lifted. Readjust the Saddle position so that the equipment is centered on the Saddle. Continue pumping until the Jack is fully extended, or the equipment is lifted to the desired height. REV 04c SKU 91039 Page 4...

  • Page 5: Maintenance

    Aluminum Base (A13) with hydraulic oil. Replace the Oil Plug (A39) and repeat steps 1 ~ 5, above. Wipe up any hydraulic oil overflow with a cloth. Test the Jack as described under Operation, step 1 on page 4. REV 04e SKU 91039 Page 5...

  • Page 6: Oil Replacement

    Back Seal Press Spring Piston Cover Discharge Valve Rod O-ring Steel Ball O-ring Bolt, Regulating Spring, Relief Valve Bolt, Seal Valve, Safety Bolt, High Pressure Ball, Steel Ball, Steel Ball, Steel Screw, Breathing O-ring Oil Plug SKU 91039 Page 6...
  • Page 7 NICIANS AND NOT BY THE BUYER. THE BUYER AS- SUMES ALL RISK AND LIABILITY ARISING OUT OF HIS OR HER REPAIRS TO THE ORIGINAL PRODUCT OR REPLACEMENT PARTS THERETO, OR ARISING OUT OF HIS OR HER INSTALLATION OF REPLACE- MENT PARTS THERETO. SKU 91039 Page 7...
  • Page 8 Saddle Base Axis, Short Saddle Base Axis, Long Saddle Base Nylon Washer Saddle Holder Axis Rubber Saddle Pad NOTE: Some parts are listed and shown for illustration purposes only and are not available individually as replacement parts. SKU 91039 Page 8...
  • Page 9 Jack Assembly Drawing SKU 91039 Page 9...
  • Page 10 This warranty gives you specific legal rights and you may also have other rights which vary from state to state. 3491 Mission Oaks Blvd. • PO Box 6009 • Camarillo, CA 93011 • (800) 444-3353 ReV 10a SKU 91039 Page 10...

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