Harbor Freight Tools Automobile Parts 92840 User Manual

AIR FLOOR JACK  
25 TON / 50 TON  
Model 92840  
ASSEMBLY and OPERATING  
INSTRUCTIONS  
®
3491 Mission Oaks Blvd., Camarillo, CA 93011  
TO PREVENT SERIOUS INJURY OR DEATH,  
READ AND UNDERSTAND ALL WARNINGS  
AND INSTRUCTIONS BEFORE USE.  
®
©
Copyright 2005 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  
 
8.  
9.  
Do not overreach. Keep proper footing and balance at all times. Do not reach over or  
across Jack or Jack Stands under a load.  
Maintain tools with care. Keep tools clean for better and safer performance. Follow  
instructions for lubricating and changing accessories. Inspect tool cords and air hoses  
periodically and, if damaged, have them repaired by an authorized technician. The  
handle must be kept clean, dry, and free from oil and grease at all times.  
10. Disconnect air supply. Disconnect air hose when not in use.  
11. Avoid unintentional starting. Be sure the controls are in the neutral position when  
not in use and before plugging in. Do not move any tool while touching the controls,  
whether it is connected to the air or not.  
12. Stay alert. Watch what you are doing, use common sense. Do not operate any tool  
when you are tired.  
13. 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.  
Do not use the tool if the controls do not operate properly.  
14. Guard against electric shock. Prevent body contact with grounded surfaces such as  
pipes, radiators, ranges, and refrigerator enclosures.  
15. 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.  
16. Do not operate tool if under the influence of alcohol or drugs. Read warning  
labels if taking prescription medicine to determine if your judgement or reflexes are  
impaired while taking drugs. If there is any doubt, do not operate the tool.  
17. Use proper size and type extension cord. If an extension cord is required for the air  
compressor, it must be of the proper size and type to supply the correct current to the  
compressor without heating up. Otherwise, the extension cord could melt and catch  
fire, or cause electrical damage to the compressor. Check your air compressor’s  
manual for the appropriate size cord.  
18. Maintenance. For your safety, maintenance should be performed regularly by a  
qualified technician.  
19. Compressed air only. Never use combustible gas as a power source.  
Note: Performance of the compressor (if powered by line voltage) may vary depending on  
variations in local line voltage. Extension cord usage may also affect tool performance.  
Warning:The warnings, cautions, and instructions discussed in this instruction manual  
cannot cover all possible conditions and situations that may occur. It must be under-  
stood by the operator that common sense and caution are factors which cannot be  
built into this product, but must be supplied by the operator.  
SKU 92840  
For technical questions, please call 1-800-444-3353  
Page 3  
 
Specific Jack Safety Instructions  
Warning!! Stand clear of the Jack when raising or lowering a vehicle.  
1.  
Jack Capacity. Never exceed the Jack’s capacity of 25 Tons (Stage 2) or 50 Tons  
(Stage 1). Check the vehicle’s owner’s manual to determine the actual gross weight of  
your vehicle before attempting to lift it. Never attempt to lift a load greater than 25 Tons  
above the Stage 1 level.  
2.  
3.  
Never ride on the Jack. Never ride on the Jack, and never have people or pets in the  
vehicle you are raising.  
Only use Jack to raise/lower vehicle. After raising the vehicle, use jack stands to keep  
the vehicle suspended for any period of time. Do not work on, around, or under the  
vehicle while it is supported by the Jack.  
4.  
Place Jack on correct surface. Only use this Jack on a stable, smooth, level,  
clean, and dry surface that is capable of sustaining the load (ie.thick cured concrete  
or thick steel). This Jack has exposed hoses in its undercarriage.  
5.  
6.  
Stabilize the load. Ensure that the load remains stable at all times.  
Vehicle lifting. When lifting a vehicle, apply the emergency brake and block all of the  
wheels that will remain on the ground.  
7.  
8.  
9.  
Center load. Center the load on the Jack Ram (2). Off-center loads can damage seals,  
causing Jack failure.  
Lift only using correct vehicle lift points. Read the vehicle manual to find the proper  
lifting points for the vehicle.  
Never use the Jack unless it is filled with hydraulic fluid. Filling with hydraulic fluid  
is covered in the maintenance section of this manual.  
10. NEVER USE THIS JACK FOR AIRCRAFT PURPOSES.  
11. Industrial applications must follow OSHA requirements.  
12. Never move jack when under load. The wheels are intended for NO LOAD movement  
only.  
Unpacking  
When unpacking, check to make sure that the product is intact and undamaged. 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.  
Assembly  
Before use, the Shipping Plug (99) must be removed and replaced with the Oil Plug (26).  
The Oil Plug (26) is hanging from the Shipping Plug. Changing these plugs must be done  
prior to running the unit. See FIGURE 4 under Maintenance, on page 7. Save the Shipping  
Plug (99) for any further transport.  
SKU 92840  
For technical questions, please call 1-800-444-3353  
Page 4  
 
Air Connection  
Two Stage  
Jack  
For best service you should incorporate an oiler, regulator, and inline filter, as shown in the  
diagram above. Hoses, couplers, oilers, regulators, and filters are all available at Harbor  
Freight Tools.  
1
1.  
You will need to prepare a / ” air connector (not included) to connect to the Air Inlet  
4
1
(29) on the Handle (40) of the Jack. First, wrap the / ” air connector with pipe thread  
seal tape before threading it into the Air Inlet (29). Connect the / ” ID air source hose  
4
3
8
to a quick connect coupler, and then to the Impact Wrench. See FIGURE 1.  
Note: If you are not using an automatic oiler system, before operation, add a few drops  
of Pneumatic Tool Oil to the airline connection. Add a few drops more after each hour  
of continual use.  
2.  
3.  
Set the air pressure on the regulator to 150-200 PSI. Do not exceed the recom-  
mended air pressure of 200 PSI.  
Check the air connection for leaks. Disconnect from the air source.  
FIGURE 1  
Lever (27)  
Air Inlet (29)  
Controls  
Explanation  
Handle (40)  
Handle Position Lever  
SKU 92840  
For technical questions, please call 1-800-444-3353  
Page 5  
 
Operation  
Raising the Vehicle  
Note: This Two Stage Jack comes with two Adapters (1). The two Adapters (1) are stored by  
the wheels of the Jack (see FIGURES 2 and 3).  
FIGURE 2  
Both Adapter (1) extensions on.  
Note: The Handle is adjustable. You can position it into any of the slots shown in FIGURE 3  
below by pulling the Handle Position Lever, and moving the Handle until the lever drops  
into place (see FIGURE 1 on page 5).  
FIGURE 3  
Adapter (1)  
Adapter (1)  
Warning! The Jack and vehicle being lifted must be stable when lifted so 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.  
1.  
Position the Jack under the vehicle to be lifted is at one of the recommended lifting  
points. Connect to the air source and turn on the compressor. Turn the Lever (27) to  
the right toward the UP arrow on the Controls (see FIGURE 1 on page 5). Lift the load  
slightly and check that the load is stable on the jack. If not, lower the load and check  
that the vehicle has no load on it and that the jack is in the proper position. Allow the  
Jack to rise to the desired level, and then move the Lever (27) into the neutral position  
between the UP and DOWN positions (shown in FIGURE 1).  
2.  
Place jack stands (not included) under the vehicle before attempting to do any  
work on, in, under, or around the vehicle.  
SKU 92840  
For technical questions, please call 1-800-444-3353  
Page 6  
 
Operation (continued)  
Lowering the Vehicle  
1.  
First, clear any tools or equipment from under the vehicle. Make sure there are no  
obstructions and that people are at a safe distance from the vehicle.  
Note: Position yourself safely so that your body is not under any part of the  
vehicle before lowering the Jack or removing the jack stands.  
2.  
Position the Jack so that the Ram (2) is at one of the recommended lifting points.  
Turn the Lever (27) to the right toward the UP arrow on the Controls (see FIGURE 1 on  
page 5). Raise the Jack just enough so that you can remove the jack stands. Then,  
turn back the Lever (27) to the neutral position and remove the jack stands.  
3.  
4.  
Lower the load slowly in a controlled fashion: Turn the Lever (27) slightly to the left  
toward the DOWN arrow on the Controls (see FIGURE 1 on page 5), and allow the load  
to lower slowly.  
Remove the Jack from under the vehicle. Disconnect the air supply.  
Maintenance  
1.  
2.  
3.  
Keep the Jack clean and dry. When not in use, store in a dry location to inhibit rust.  
Always lock up equipment and keep out of reach of children.  
Have a qualified service technician periodically dismantle and lubricate the handle  
assembly and all lift arm linkages.  
Before each use, check the oil level through the oil plug hole shown in FIGURE 4 below.  
Make sure it is full before each use. Fill oil if necessary by removing the Oil Plug (26).  
Watch for hydraulic oil leaks. If leaks are present, contact a qualified service techni-  
cian. Have a qualified service technician change the oil and lubricate the Jack annu-  
ally.  
FIGURE 4  
Replace Shipping Plug (99)  
with Oil Plug (26)  
SKU 92840  
For technical questions, please call 1-800-444-3353  
Page 7  
 
Parts List  
Part No. Description Qty.  
Part No.  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
51  
52  
53  
54  
55  
56  
57  
58  
59  
60  
61  
62  
63  
64  
65  
66  
67  
68  
Description  
Rod  
Pin  
0-ring  
Bolt  
Spring Washer 4  
Handle  
Bolt  
Union  
Ring  
Tube  
Union  
Screw  
Bolt  
Switch Case  
0-ring  
Union  
Tube  
Air Pipe Assy.  
Union  
Tube  
Union  
Oil Box  
Bolt  
Sp. Washer  
Union  
0-ring  
Cover  
Spring  
Rel. Rod  
Spring  
Bearing  
Sp. Seat  
Spring  
Screw  
Qty.  
1
1
3
2
Part No.  
69  
70  
71  
72  
73  
74  
75  
76  
77  
78  
79  
80  
81  
82  
83  
84  
85  
86  
87  
88  
89  
90  
91  
92  
93  
94  
95  
96  
97  
98  
99  
100  
Description  
Washer  
Screw  
Spring  
Spring  
Spring  
0-ring  
Union  
Box  
Spg. Washer  
Bolt  
Bolt  
Spg. Washer  
Valve Base  
0-ring  
Bushing  
Ring  
Qty.  
5
5
1
1
1
1
1
1
4
4
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Adapter  
Ram  
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
2
1
2
1
1
1
1
1
1
1
1
2
2
3
4
Dust Ring  
0-ring  
5
6
Piston Rod  
0-ring  
1
2
1
4
2
1
1
4
1
2
1
1
1
1
1
2
1
4
2
1
5
1
1
1
4
5
1
1
1
7
y-ring  
8
9
Bushing  
Sp. Washer  
Plate  
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  
0-ring  
Ring  
0-ring  
y-ring  
Ring  
0-ring  
Bushing  
Union  
Hand Ring  
Ring  
y-ring  
Bolt  
Piston Rod  
Plate  
Big Piston  
Pro. Ring  
0-ring  
Pump Body  
Bushing  
Seal Washer  
Small Piston  
Cover  
Screw  
Wheel  
Sp. Washer  
Rod  
Sp. Washer  
Oil Plug  
Lever  
Ring  
Air Inlet  
Sp. Base  
Valve Block  
0-ring  
Valve Body  
Union  
Ball  
Cyl. Base  
Ship. Plug  
0-ring  
PLEASE READTHE FOLLOWING CAREFULLY  
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDEDTHE PARTS DIAGRAM INTHIS  
MANUAL AS A REFERENCE TOOL ONLY. NEITHER THE MANUFACTURER NOR DISTRIBU-  
TOR MAKES ANY REPRESENTATION ORWARRANTY OF ANY KINDTO THE BUYERTHAT 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 STATESTHAT ALL REPAIRS AND PARTS REPLACEMENTS  
SHOULD BE UNDERTAKEN BY CERTIFIED AND LICENSED TECHNICIANS AND NOT BY THE  
BUYER. THE BUYER ASSUMES 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 REPLACEMENT PARTS THERETO.  
NOTE: Some parts are listed and shown for illustration purposes only and are not available  
individually as replacement parts.  
SKU 92840  
For technical questions, please call 1-800-444-3353  
Page 8  
 
Assembly Drawing  
SKU 92840  
For technical questions, please call 1-800-444-3353  
Page 9  
 

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