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
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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
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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
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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
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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
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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
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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
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Jack Assembly Drawing
SKU 91039
Page 9
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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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