Page 1
SPX Corporation
655 Eisenhower Drive
Owatonna, MN 55060-0995 USA
Phone: (507) 455-7000
Tech. Serv.: (800) 533-6127
Fax: (800) 955-8329
Order Entry: (800) 533-6127
Fax: (800) 283-8665
International Sales: (507) 455-7223
Fax: (507) 455-7063
Parts List &
Operating Instructions
for: 5012A
Form No. 106218
Under Axle Jack
Max. Capacity: 25 Tons
The Under Axle Jack is an air-operated lifting device designed for jacking loaded trailers and trucks using the
manufacturer's recommended lift points on the chassis.
© SPX Corporation
Sheet No. 1 of 4
Issue Date: Rev. C, 8-16-02
Page 2
Parts List & Operating Instructions Form No. 106218, Sheet 1 of 4, Back
Safety Precautions
CAUTION: To help prevent personal injury and damage to equipment,
Read, understand, and follow all instructions, including the ANSI B30.1 safety code for
•
jacks. Before using the under axle jack to lift a vehicle, refer to the vehicle service
manual for recommended lifting surfaces on the vehicle chassis.
Wear protective eyewear that meets the requirements of ANSI Z87.1 and OSHA.
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Inspect the jack before each use; do not use the jack if it’s damaged, altered, or in poor
•
condition.
Use the jack for lifting purposes only.
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A load must never exceed the rated lifting capacity of the jack.
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Only use the jack on a hard, level surface.
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Center the load on the jack saddle. Off-center loads can damage seals and cause jack
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failure.
Lift only dead weight.
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Stay clear of lifted loads. Place support stands under the axles before working on the
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vehicle.
Do not adjust the safety valve.
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Do not modify the jack or use adapters unless approved or supplied by OTC.
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Lower the jack slowly and carefully while watching the position of the jack saddle.
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Use only approved hydraulic fluid (Chevron AW Hydraulic Oil MV or equivalent). The use of alcohol,
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hydraulic brake fluid, or transmission oil could damage seals and result in jack failure.
This guide cannot cover every situation, so always do the job with safety first.
Operating Instructions
1. Lubricate the air inlet on the jack with 1/2 oz. clean lubricating oil; lack of oil can cause pump malfunction.
2. Connect the air supply. (90 - 200 psi of clean, dry air is required for the capacity of this jack.)
3. Set the vehicle’s parking brakes and / or block the wheels.
4. Position the jack under the vehicle. Important: Use the vehicle manufacturer’s recommended lifting
points on the chassis.
5. Close the release valve by turning the release knob clockwise (CW) as far as it will go.
6. Press the air valve lever to raise the jack saddle until it touches the vehicle. Check the placement of the saddle
lugs. Finish lifting the vehicle.
7. Place approved safety stands under the vehicle at points that will provide stable support. Before making
repairs, lower the vehicle onto the safety stands by SLOWLY and carefully turning the release knob
counterclockwise (CCW).
Bleeding Air from the Under Axle Jack
Air can accumulate within a hydraulic system during shipment or after prolonged use. This entrapped air causes
the jack to respond slowly or feel “spongy.” To remove the air:
1. Open the release valve by turning the knob all the way counterclockwise (CCW).
2. Connect the air supply to the jack.
3. Press the air valve control lever, and cycle the jack twenty or more times.
4. Close the release valve by turning the knob all the way clockwise (CW).
5. Press the air valve control lever until the ram is fully extended.
6. Lower the ram by turning the release knob all the way CCW. If the jack does not immediately respond, repeat
this procedure.
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Parts List & Operating Instructions Form No. 106218
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© SPX Corporation
47
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Sheet No. 2 of 4
Issue Date: Rev. C, 8-16-02
Page 4
Parts List & Operating Instructions Form No. 106218, Sheet 2 of 4, Back
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Parts List & Operating Instructions Form No. 106218
Item
No.
1 j 1 Seal
2 5012-02 2 Plug
3 5012-03 1 Jack Cap
4 j 2 Backup Ring
5 5012-05 1 Extension Screw
6 5012-86 1 Hydraulic Ram
7 5012-07 1 Hydraulic Cylinder
8 5012-08 1 Outer Barrel Weldment
9 5012-09 1 Bladder
11 j 1 Quad Ring
12 5012-87 1 Socket Hd. Cap Screw
13 j 1 Seal
14 5012-88 1 Base Plate
15 j 2 Quad Ring
16 j 1 Backup Ring
18 5012-89 1 Pump Housing
19 5012-19 1 Pump Plunger
20 j 1 Seal
21 5012-97 1 Pump Housing Cap
22 j 2 Quad Ring
23 5012-23 1 Compression Spring
24 5012-93 1 Retaining Ring
25 j 1 O-ring
26 5012-91 1 Motor Housing
27 j 1 Shuttle Valve Seal
28 j 1 Seal
29 5012-94 1 Air Shuttle Piston
30 5012-92 1 Piston Cap
31 5012-31 1 Compression Spring
32 5012-32 1 Ball
33 5012-33 1 Check Valve Spacer
34 5012-34 1 Male Elbow
35 5012-35 1 Plug
36 5012-36 2 Ball
37 5012-37 1 Plastic Plug
38 5012-38 1 Plug
39 5012-39 1 Male Connector
41 j 1 O-ring
42 5012-42 1 Release Stem
43 5012-43 1 Roll Pin
45 5012-45 1 Flex Shaft
Part
No.
No.
Req'd
Description
(2-5/8 x 2-7/8 x 1/18; loaded lip)
(1/8 NPT)
(3-1/8 x 3/16 x 3-1/2)
(2-3/4 x 1/8 x 3)
(2-1/2 x 3 x 1/4)
(7/16 x 1/4 x 3/32)
(11/16 x 1/2)
(9/16 x 5/16 x 1/8)
(3 x 2-5/8 x 3/16)
(1-3/4 OD)
(2-1/4 x 1/16 x 2-1/8)
(31/32 dia.)
(1-1/4 x 1 x 1/8)
(1/4 ID x 3/8" lg.)
(3/8 dia.)
(90° x 1/8 NPTF)
(1/4 dia.)
(SAE #4)
(1/8 NPTF)
(3/8 x 1/4 x 1/16)
(3/16 dia. x 3/4" lg.)
(6-32 UNC x 1/4" lg.)
j Items marked with an asterisk are
© SPX Corporation
included in Seal Kit No. 222954.
Sheet No. 3 of 4
Issue Date: Rev. C, 8-16-02
Page 6
Parts List & Operating Instructions Form No. 106218, Sheet 3 of 4, Back
Item
No.
47 5012-47 1 Branch Tee (1/8 NPT)
48 5012-48 2 Socket Hd. Cap Screw
50 5012-50 1 Washer
51 5012-51 1 Backup Ring
52 5012-52 1 Compression Spring
53 5012-53 1 Lift Pad Casting
54 5012-54 1 O-ring
55 5012-98 1 Power Unit
56 5012-56 4 Self-tapping Screw
57 5012-57 4 Cap Screw
58 5012-58 4 Lockwasher
59 5012-59 1 Base Frame Weldment
60 5012-60 1 Tubing
61 5012-61 1 Top Cover
62 5012-62 1 Tubing
63 5012-63 2 Handle Grip
64 5012-64 1 Handle Bar
65 5012-65 1 Handle Wheel
66 5012-66 2 Roll Pin
67 5012-67 1 Handle Grip
68 5012-68 2 Male Connector
69 5012-69 1 Nipple
70 5012-70 1 Air Valve
71 5012-71 1 Handle Weldment
72 5012-72 1 Handle Release Rod Weldment
73 5012-73 2 Jam Nut
74 5012-74 2 Washer Cap Palnut
75 5012-96 1 Bar Round
76 5012-95 2 Wheel
77 5012-77 1 Compression Spring
78 5012-78 1 Release Control Rod
79 5012-79 2 Cap Screw
80 216703 1 Made in USA Decal
81 314486 1 Decal
82 5012-82 1 Decal
85 5012-90 1 Motor Piston
Part
No.
No.
Req'd
Description
(3/8-24 x 2-1/4" Ig.)
(1.750 x .320 x .064)
(1-5/8 x 1/16 x 2)
(.406 OD)
(5/8")
(1-1/16 x 1-1/4 x 3/32)
(5/16-18)
(1/2-13 x 1"; Grade 5; plated)
(1/2"; plated)
(1 /4 x .035 x 45-1/2" lg.)
(1/4 x .035 x 60" Ig.)
(7/8" ID; black)
(3/16 dia. x 7/8" Ig.)
(1/4 NPTF)
(7/16-14; plated)
(5/8 dia.; plated)
(5/8" x 14")
Available Kits
222954 1 Seal Kit (items marked with an (j) asterisk)
220972 1 Lift Pad Extension Kit
(3")
Page 7
Parts List & Operating Instructions Form No. 106218
Preventive Maintenance
Important: The greatest single cause of failure in hydraulic units is dirt. Keep the under axle jack clean and well lubricated to prevent
foreign matter from entering the system. If the jack has been exposed to rain, snow, sand, or grit, it must be cleaned before it is used.
1. Store the jack in a well-protected area where it will not be exposed to corrosive vapors, abrasive dust, or any other harmful elements.
2. Regularly lubricate the moving parts.
3. Replace the oil in the reservoir at least once per year. To check the oil level, disconnect the air supply, place the under axle jack on
level ground, and completely retract the ram. Remove the plastic cover and plug from the oil filler hole. The oil level should be within
1/4" of the filler plug hole. If necessary, add approved anti-wear hydraulic jack oil, and install the filler plug again. Important: The use
of alcohol, hydraulic brake fluid, detergent motor oil, or transmission oil could damage the seals and result in jack failure.
4. Inspect the jack before each use. Take corrective action if any of the following problems are found:
a. Cracked or damaged housing d. Scored or damaged piston rod
b. Excessive wear, bending, or other damage e. Loose hardware
c. Leaking hydraulic fluid f. Modified or altered equipment
Troubleshooting Guide
Repair procedures must be performed in a dirt-free environment by qualified personnel who are familiar with this equipment.
Trouble Cause Solution
Erratic action 1. Air in system
2. Oil viscosity too high
3. Internal leakage in cylinder
4. Cylinder sticking or binding
Jack does not lift 1. Release valve is open
2. Low/no oil in reservoir
3. Air-locked system
4. Load is above capacity of jack
5. Delivery valve and/or bypass
valve not working correctly
6. Packing worn out or defective
Jack lifts only partially 1. Too much or not enough oil
Jack advances slowly 1. Pump not working correctly
2. Leaking seals
3. Low air pressure
Jack lifts load, but doesn’t hold 1. Cylinder packing is leaking
2. Valve not working correctly (suction,
delivery, release, or bypass)
3. Air-locked system
1. To bleed air, place jack on its base with
ram retracted, open release valve knob,
and cycle ram 20 times.
2. Change to a lower viscosity oil
3. Replace worn packings. Look for
excessive contamination or wear.
4. Look for dirt, gummy deposits, or leaks.
Check for misalignment, worn parts,
or defective packings.
1. Close release valve
2. Fill with oil and bleed system
3. Bleed system
4. Use correct equipment
5. Clean to remove dirt or foreign matter.
Replace oil.
6. Replace power unit
1. Check oil level
1. Replace power unit
2. Replace power unit or seals
3. Adjust air pressure to 90 - 200 psi.
1. Replace power unit or seals
2. Inspect valves. Clean and repair
seat surfaces.
3. Bleed system
Jack leaks oil 1. Worn or damaged seals
Jack will not retract 1. Release valve is closed
Jack retracts slowly 1. Cylinder damaged internally
© SPX Corporation
2. Link section is binding
1. Replace power unit or seals
1. Open or clean release valve
1. Send jack to OTC authorized service
center for repair
2. Lubricate link section
Sheet No. 4 of 4
Issue Date: Rev. C, 8-16-02
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