Harbor Freight Tools Automobile Parts 91039 User Manual

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®. 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. 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  
 
9.  
Maintain tools with care. Keep tools sharp and clean for better and safer  
performance. Follow instructions for lubricating and changing accessories. Inspect tool  
cords 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. Stay alert. Watch what you are doing, use common sense. Do not operate any tool  
when you are tired.  
11. 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. Check 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.  
12. 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.  
13. Do not operate tool if under the influence of alcohol or drugs. Read warning  
labels if taking prescription medicine to determine if your judgment or reflexes are  
impaired while taking drugs. If there is any doubt, do not operate the tool.  
14. Maintenance. For your safety, service and maintenance should be performed  
regularly by a qualified technician.  
Warning: The warnings, cautions, and instructions discussed in this instruction manual can-  
not cover all possible conditions and situations that may occur. It must be understood by the  
operator that common sense and caution are factors which cannot be built into this product,  
but must be supplied by the operator.  
Specific Jack Safety Precautions  
1.  
2.  
Do not overload this equipment. Know the weight of the load being lifted.  
Use Jack for lifting only. Do not use this equipment for any other purpose.  
Immediately after lifting, support the load with appropriate supporting equipment.  
3.  
4.  
5.  
6.  
7.  
8.  
Place Jack correctly. Only use this equipment on a surface that is stable, level,  
clean and dry, and capable of sustaining the load.  
Stabilize load. Ensure that the load remains stable at all times. Do not move load  
while on the Jack. Lift deadweight loads only.  
Vehicle lifting. When lifting a vehicle, apply the emergency brake and block all  
wheels.  
Center Load. Center the load on the Jack Saddle. Off center loads can damage the  
seals, causing Jack failure.  
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)  
REV 04f  
SKU 91039  
Page 3  
 
Unpacking  
When unpacking, check to make sure the following parts are included. Refer to the Parts  
Lists and Assembly Drawings at the end of this manual for more detail.  
Handle Base (29)  
Jack Assembly  
NOT TO BE USED  
FOR AIRCRAFT  
PURPOSES.  
Upper Handle (31)  
Lower Handle (33)  
Insert this end into the Handle Base (29)  
If any parts are missing or broken, please call Harbor Freight Tools at the number on the  
cover of this manual as soon as possible.  
Handle Assembly  
1.  
2.  
Insert the Lower Handle (33) into the Handle Base (29) until it locks in place with  
Locking Bolt (X). See photo above and on the next page.  
Insert the Upper Handle (31) into the Lower Handle (33) so that its locking pin goes  
into the hole in the Lower Handle.  
Operation  
1.  
Test the Jack by placing the Saddle (40) under a stable, dead load. Turn the Handle  
completely clockwise, and pump the Handle up and down.  
The Jack Saddle should rise and stay at that level. If it slowly goes down, tighten the  
Breathing Screw (A37). If it still goes down, the Power Unit may need to have the air  
purged from its system. Refer to the Maintenance section.  
2.  
3.  
Turn the Handle counterclockwise. The Saddle should lower completely.  
Position the Jack under the equipment or vehicle to be lifted.  
Warning:The Jack, and equipment being lifted, must be stable so when lifted, they do  
not fall and cause personal injury. Keep spectators away from the work area. Read the  
vehicle manual to find the proper lifting points for the vehicle.  
4.  
5.  
Turn the Handle clockwise to close the release valve.  
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.  
6.  
Continue pumping until the Jack is fully extended, or the equipment is lifted to the  
desired height.  
REV 04c  
SKU 91039  
Page 4  
 
7.  
Place vehicle stands, or other support devices under the equipment before attempting  
to do any work in or around it.  
Caution: Avoid rapid descent to avoid spilling of load.Turn the Handle slowly.  
8.  
Slowly and carefully lower the load by turning the Handle counterclockwise in  
extremely small increments.  
9.  
When finished using the Jack, perform maintenance on it, and store the Jack in a dry  
location.  
Maintenance  
General  
Periodically lubricate the Jack as described below.  
1.  
2.  
Lubricate the joints and Ram (A5) with a light oil as needed.  
Remove Handle and grease the lower end of the Handle where it rotates in the  
Handle Base (29).  
3.  
4.  
5.  
6.  
Oil all lift arm linkages, front wheels, and rear casters.  
Clean the outside of the Jack with a dry, clean cloth.  
If the Jack is exposed to moisture, wipe dry with a clean cloth and lubricate.  
Store Jack with piston Ram (A5) withdrawn (Saddle down), and in a clean and dry  
location.  
Purging Air from the Hydraulic System  
Air bubbles can become trapped inside the hydraulic system thereby reducing the efficiency  
of the Jack. Purge the air from the system if lift efficiency drops.  
1.  
2.  
Turn the Handle 1-1/2 turns counterclockwise.  
Remove the Breathing Screw (A37) by turning it  
counterclockwise.  
(A37)  
(A39)  
(X)  
3.  
4.  
Rapidly pump the Handle assembly several times to  
purge the air from the hydraulic system.  
Close the release valve by turning the Handle  
completely clockwise.  
5.  
6.  
Replace and tighten the Breathing Screw.  
If efficiency is still low, remove Oil Plug (A39), and top off  
fluid reservoir in the Aluminum Base (A13) with hydraulic oil.  
7.  
8.  
9.  
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  
 
Oil Replacement  
1.  
2.  
3.  
4.  
Completely lower the Saddle (40).  
Place the Jack on its side.  
Remove the Oil Plug (A39) and drain old oil into a container. See photo on page 5.  
Place Jack upright and fill with high-quality hydraulic jack oil to the lower rim of the fill  
hole.  
5.  
6.  
7.  
8.  
Replace the Oil Plug.  
Purge air from the hydraulic system as previously described.  
Wipe up any hydraulic oil overflow with a cloth.  
Contact the local Hazardous Waste Disposal authority for proper oil disposal  
instructions.  
Power Unit Parts List  
Item  
A1  
A2  
A3  
A4  
A5  
A6  
A7  
A8  
Description  
Spring Pin  
Block Linkage  
Tank Nut  
Cylinder Outer Case  
Ram  
Qty  
1
1
1
1
1
1
2
1
1
2
1
1
1
2
2
2
1
1
1
1
2
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Bushing  
O-ring  
Back Seal  
O-ring  
Snap Ring  
Hydraulic Cylinder  
O-ring  
Aluminum Base  
Oil Strainer  
O-ring  
A9  
A10  
A11  
A12  
A13  
A14  
A15  
A16  
A17  
A18  
A19  
A20  
A21  
A22  
A23  
A24  
A25  
A26  
A27  
A28  
A29  
A30  
A31  
A32  
A33  
A34  
A35  
A36  
A37  
A38  
A39  
Oil Cover  
Bolt  
Washer  
Pump Case  
Pump Core  
O-ring  
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  
 
Power Unit Assembly Drawing  
When ordering parts for the Power Unit, add an “A”  
suffex to the part number shown below.  
PLEASE READ THE FOLLOWING CAREFULLY  
THE MANUFACTURER AND/OR DISTRIBUTOR HAS  
PROVIDED THE PARTS DIAGRAM IN THIS MANUAL  
AS A REFERENCETOOL ONLY. NEITHERTHE MAN-  
UFACTURER NOR DISTRIBUTOR MAKES ANY REP-  
RESENTATION ORWARRANTY OF ANY KINDTOTHE  
BUYER THAT HE OR SHE IS QUALIFIED TO MAKE  
ANY REPAIRS TO THE PRODUCT OR THAT HE OR  
SHE IS QUALIFIEDTO REPLACE ANY PARTS OFTHE  
PRODUCT. IN FACT, THE MANUFACTURER AND/  
OR DISTRIBUTOR EXPRESSLY STATES THAT ALL  
REPAIRS AND PARTS REPLACEMENTS SHOULD BE  
UNDERTAKEN BY CERTIFIED AND LICENSEDTECH-  
NICIANS AND NOT BYTHE BUYER.THE BUYER AS-  
SUMES ALL RISK AND LIABILITY ARISING OUT OF  
HIS OR HER REPAIRSTOTHE ORIGINAL PRODUCT  
OR REPLACEMENT PARTS THERETO, OR ARISING  
OUT OF HIS OR HER INSTALLATION OF REPLACE-  
MENT PARTS THERETO.  
SKU 91039  
Page 7  
 
Jack Parts List  
Item  
1
2
3
4
5
6
7
8
Description  
Qty  
2
2
2
1
2
20  
20  
2
2
2
2
2
1
2
2
2
2
2
1
1
1
1
1
1
4
2
1
2
1
1
1
1
1
2
2
1
1
1
1
1
1
1
Frame  
Washer  
Cover Nut  
Handle Bar  
Washer  
Washer, Inner Tighten  
Screw  
Screw Bushing  
Rear Wheel Set  
Rear Wheel Saddle  
Linkage Washer  
Case  
Axis, Arm Raise  
Axis, Link Rod  
Washer, Link Rod  
C-ring  
Screw, Inner Set Angular  
Link Rod  
Caster, Front Wheel  
Axis  
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
36  
37  
38  
39  
40  
41  
42  
Lift Arm  
Spring  
Eye Bolt  
Eye Bolt  
C-ring  
Axis, Pull Rod  
Power Unit Assy.  
Axis, Handle Base  
Handle Base  
Joint Connector  
Handle, Upper  
Bolt, Hex  
Handle, Lower  
Pull Rod  
Snap Rings, Round Wire  
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  
 
Jack Assembly Drawing  
SKU 91039  
Page 9  
 
limited 90 day warranty  
Harbor Freight Tools Co. makes every effort to assure that its products meet high quality  
and durability standards, and warrants to the original purchaser that this product is free from  
defects in materials and workmanship for the period of 90 days from the date of purchase. This  
warranty does not apply to damage due directly or indirectly, to misuse, abuse, negligence or  
accidents, repairs or alterations outside our facilities, criminal activity, improper installation,  
normal wear and tear, or to lack of maintenance. We shall in no event be liable for death, in-  
juries to persons or property, or for incidental, contingent, special or consequential damages  
arising from the use of our product. Some states do not allow the exclusion or limitation of  
incidental or consequential damages, so the above limitation of exclusion may not apply to  
you. THiS WARRANTy iS expReSSly iN lieu oF All oTHeR WARRANTieS, expReSS  
oR iMplieD, iNCluDiNg THe WARRANTieS oF MeRCHANTAbiliTy AND FiTNeSS.  
To take advantage of this warranty, the product or part must be returned to us with  
transportation charges prepaid. proof of purchase date and an explanation of the complaint  
must accompany the merchandise. If our inspection verifies the defect, we will either repair or  
replace the product at our election or we may elect to refund the purchase price if we cannot  
readily and quickly provide you with a replacement. We will return repaired products at our  
expense, but if we determine there is no defect, or that the defect resulted from causes not  
within the scope of our warranty, then you must bear the cost of returning the product.  
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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