SPX 5012A User manual

© SPX Corporation
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
655 Eisenhower Drive
Owatonna, MN 55060-0995 USA
Phone: [phone]
Tech. Serv.: [phone]
Fax: [phone]
Order Entry: [phone]
Fax: [phone]
International Sales: [phone]
Fax: [phone]
Parts List &
Operating Instructions
for: 5012A
Sheet No. 1 of 4
Issue Date: Rev. C, 8-16-02

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,andfollowallinstructions,includingtheANSIB30.1safetycodefor
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.
•Inspectthejackbeforeeachuse;donotusethejackifit’sdamaged,altered,orinpoor
condition.
•Use the jack for lifting purposes only.
•A load must never exceed the rated lifting capacity of the jack.
•Only use the jack on a hard, level surface.
•Center the load on the jack saddle. Off-center loads can damage seals and cause jack
failure.
•Lift only dead weight.
•Stay clear of lifted loads. Place support stands under the axles before working on the
vehicle.
•Do not adjust the safety valve.
•Do not modify the jack or use adapters unless approved or supplied by OTC.
•Lower the jack slowly and carefully while watching the position of the jack saddle.
•Use only approved hydraulic fluid (Chevron AW Hydraulic Oil MV or equivalent). The use of alcohol,
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. Presstheairvalvelevertoraisethejacksaddleuntilittouchesthevehicle.Checktheplacementofthesaddle
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
Aircanaccumulatewithinahydraulicsystemduringshipmentorafterprolongeduse.Thisentrappedaircauses
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. LowertherambyturningthereleaseknoballthewayCCW.Ifthejackdoesnotimmediatelyrespond,repeat
this procedure.

© SPX Corporation
Parts List & Operating Instructions Form No. 106218
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Sheet No. 2 of 4
Issue Date: Rev. C, 8-16-02

Parts List & Operating Instructions Form No. 106218, Sheet 2 of 4, Back
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© SPX Corporation
Parts List & Operating Instructions Form No. 106218
Description
Item
No. Part
No. No.
Req'd
1j1Seal
(2-5/8 x 2-7/8 x 1/18; loaded lip)
25012-02 2Plug (1/8 NPT)
35012-03 1Jack Cap
4 j2Backup Ring (3-1/8 x 3/16 x 3-1/2)
55012-05 1Extension Screw
65012-86 1Hydraulic Ram
75012-07 1Hydraulic Cylinder
85012-08 1Outer Barrel Weldment
95012-09 1Bladder
11 j1Quad Ring
(2-3/4 x 1/8 x 3)
12 5012-87 1Socket Hd. Cap Screw (6-32 UNC x 1/4" lg.)
13 j1Seal (2-1/2 x 3 x 1/4)
14 5012-88 1Base Plate
15 j2Quad Ring (7/16 x 1/4 x 3/32)
16 j1Backup Ring (11/16 x 1/2)
18 5012-89 1 Pump Housing
19 5012-19 1Pump Plunger
20 j1Seal
(9/16 x 5/16 x 1/8)
21 5012-97 1Pump Housing Cap
22 j2 Quad Ring (3 x 2-5/8 x 3/16)
23 5012-23 1Compression Spring (1-3/4 OD)
24 5012-93 1Retaining Ring
25 j1O-ring
(2-1/4 x 1/16 x 2-1/8)
26 5012-91 1Motor Housing
27 j1 Shuttle Valve Seal (31/32 dia.)
28 j1Seal (1-1/4 x 1 x 1/8)
29 5012-94 1Air Shuttle Piston
30 5012-92 1Piston Cap
31 5012-31 1Compression Spring
(1/4 ID x 3/8" lg.)
32 5012-32 1Ball (3/8 dia.)
33 5012-33 1Check Valve Spacer
34 5012-34 1Male Elbow
(90 ° x 1/8 NPTF)
35 5012-35 1Plug
36 5012-36 2Ball (1/4 dia.)
37 5012-37 1Plastic Plug
38 5012-38 1Plug (SAE #4)
39 5012-39 1Male Connector (1/8 NPTF)
41 j1O-ring (3/8 x 1/4 x 1/16)
42 5012-42 1Release Stem
43 5012-43 1Roll Pin (3/16 dia. x 3/4" lg.)
45 5012-45 1Flex Shaft
jItems marked with an asterisk are
included in Seal Kit No. 222954.
Sheet No. 3 of 4
Issue Date: Rev. C, 8-16-02

Parts List & Operating Instructions Form No. 106218, Sheet 3 of 4, Back
Description
Item
No. Part
No. No.
Req'd
47 5012-47 1 Branch Tee (1/8 NPT)
48 5012-48 2Socket Hd. Cap Screw
(3/8-24 x 2-1/4" Ig.)
50 5012-50 1Washer (1.750 x .320 x .064)
51 5012-51 1Backup Ring (1-5/8 x 1/16 x 2)
52 5012-52 1Compression Spring (.406 OD)
53 5012-53 1Lift Pad Casting (5/8")
54 5012-54 1O-ring (1-1/16 x 1-1/4 x 3/32)
55 5012-98 1Power Unit
56 5012-56 4Self-tapping Screw (5/16-18)
57 5012-57 4 Cap Screw (1/2-13 x 1"; Grade 5; plated)
58 5012-58 4Lockwasher (1/2"; plated)
59 5012-59 1Base Frame Weldment
60 5012-60 1Tubing
(1 /4 x .035 x 45-1/2" lg.)
61 5012-61 1Top Cover
62 5012-62 1Tubing (1/4 x .035 x 60" Ig.)
63 5012-63 2Handle Grip (7/8" ID; black)
64 5012-64 1Handle Bar
65 5012-65 1Handle Wheel
66 5012-66 2Roll Pin
(3/16 dia. x 7/8" Ig.)
67 5012-67 1Handle Grip
68 5012-68 2Male Connector (1/4 NPTF)
69 5012-69 1Nipple
70 5012-70 1Air Valve
71 5012-71 1Handle Weldment
72 5012-72 1Handle Release Rod Weldment
73 5012-73 2Jam Nut
(7/16-14; plated)
74 5012-74 2Washer Cap Palnut (5/8 dia.; plated)
75 5012-96 1Bar Round (5/8" x 14")
76 5012-95 2Wheel
77 5012-77 1Compression Spring
78 5012-78 1Release Control Rod
79 5012-79 2Cap Screw
80 216703 1Made in USA Decal
81 314486 1Decal
82 5012-82 1Decal
85 5012-90 1Motor Piston
Available Kits
222954 1Seal Kit (items marked with an (j) asterisk)
220972 1Lift Pad Extension Kit
(3")

© SPX Corporation
Parts List & Operating Instructions Form No. 106218
Preventive Maintenance
Important:Thegreatestsinglecauseoffailureinhydraulicunitsisdirt.Keeptheunderaxlejackcleanandwelllubricatedtoprevent
foreignmatterfromenteringthesystem.Ifthejackhasbeenexposedtorain,snow,sand,orgrit,itmustbecleanedbeforeitisused.
1. Storethejackinawell-protectedareawhereitwillnotbeexposedtocorrosivevapors,abrasivedust,oranyotherharmfulelements.
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
levelground, and completelyretracttheram.Removethe plastic coverandplugfromtheoil filler hole. Theoillevelshouldbe within
1/4"ofthefillerplughole.Ifnecessary,addapprovedanti-wearhydraulicjackoil,andinstallthefillerplugagain.Important: Theuse
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 1. To bleed air, place jack on its base with
ram retracted, open release valve knob,
and cycle ram 20 times.
2. Oil viscosity too high 2. Change to a lower viscosity oil
3. Internal leakage in cylinder 3. Replace worn packings. Look for
excessive contamination or wear.
4. Cylinder sticking or binding 4. Look for dirt, gummy deposits, or leaks.
Check for misalignment, worn parts,
or defective packings.
Jack does not lift 1. Release valve is open 1. Close release valve
2. Low/no oil in reservoir 2. Fill with oil and bleed system
3. Air-locked system 3. Bleed system
4. Load is above capacity of jack 4. Use correct equipment
5. Delivery valve and/or bypass 5. Clean to remove dirt or foreign matter.
valve not working correctly Replace oil.
6. Packing worn out or defective 6. Replace power unit
Jack lifts only partially 1. Too much or not enough oil 1. Check oil level
Jack advances slowly 1. Pump not working correctly 1. Replace power unit
2. Leaking seals 2. Replace power unit or seals
3. Low air pressure 3. Adjust air pressure to 90 - 200 psi.
Jack lifts load, but doesn’t hold 1. Cylinder packing is leaking 1. Replace power unit or seals
2. Valve not working correctly (suction, 2. Inspect valves. Clean and repair
delivery, release, or bypass) seat surfaces.
3. Air-locked system 3. Bleed system
Jack leaks oil 1. Worn or damaged seals 1. Replace power unit or seals
Jack will not retract 1. Release valve is closed 1. Open or clean release valve
Jack retracts slowly 1. Cylinder damaged internally 1. Send jack to OTC authorized service
center for repair
2. Link section is binding 2. Lubricate link section
Sheet No. 4 of 4
Issue Date: Rev. C, 8-16-02