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
Parts List &
Operating Instructions
for: 1788A
Fax: (800) 283-8665
International Sales: (507) 455-7223
Fax: (507) 455-7063
Air / Hydraulic Under Axle Jack
Form No. 520698
Max. Capacity: 22 Tons
116
108
107
106
105
110
111
112
113
114
96
97
98
99
49
51
52
55
56
57
58
59
61
72
53
47
48
65
66
46
104
95
101
102
103
100
39
38
88
89
90
91
93
94
44
45
40
41
42
43
2
75
87
33
37
32
36
31
35
30
34
29
28
27
50
19
20
86
3
4
5
6
7
24
11
12
25
26
13
14
18
76
77
115
17
16
15
79
80
81
82
84
78
2
1
83
85
71
60
62
21
70
63
23
22
69
68
117
© 2003 SPX Corporation
63
These instructions have been written to help the user more
effectively use and maintain OTC jacks. Some of the information
64
73
74
applying to construction, installation, operation, inspection,
and maintenance of hydraulic jacks was selected from ANSI
B30.1 and ASME/ANSI PALD-1. It is strongly recommended
that the user read these two documents, which may be ordered
from the American Society of Mechanical Engineers, 22 Law
Drive, P.O. Box 2900, Fairfield, New Jersey 07007-2900.
67
54
Sheet No. of 3
1
Issue Date: Rev. E August 3, 2005
Page 2
Parts List & Operating Instructions Form No. 520698, Sheet 1 of 3, back
Replacement Parts
Item No. Qty. Description
12Snap Ring
22Wheel
31Spring Hanger
41Snap Ring
51Bushing
61O-ring
71Bushing
11 1 Washer
12 1 O-ring
13 1 Oil Filler Plug
14 1 Oil Cylinder Assembly
15 2 Nut
16 2 Spring
17 2 Bolt
18 3 Bolt
19 3 O-ring
20 1 20 mm Extension Adapter
21 1 20 mm Extension Adapter
22 1 60 mm Extension Adapter
23 1 100 mm Extension Adapter
24 1 Piston Ring
25 1 Washer
26 1 Snap Ring
27 1 Valve Block
28 1 Steel Ball
29 1 Pin
30 1 Steel Ball
31 1 Spring
32 1 Copper Washer
33 1 Bolt
34 1 Steel Ball
35 1 Ball Seat
36 1 Spring
37 1 Screw
38 1 Sealing Washer
39 1 Valve Plug Screw
40 1 Steel Ball
41 1 Sealing Washer
42 1 Release Valve Rod
43 8 Rivet
44 1 Universal Joint A
45 2 Block
46 1 Universal Joint B
47 1 Rod
48 1 Universal Joint C
49 1 Universal Joint D
50 1 Pin
51 1 Knob
52 1 Pin
53 1 Rear Handle
54 1 Front Handle
55 2 Handle Sleeve
56 1 Sleeve
57 1 Lock Lever
58 1 Pin
59 2 Bolt
Item No. Qty. Description
60 1 Spring
61 1 Control Rod A
62 1 Control Rod B
63 2 Convey Rod
64 1 Rod Joint
65 1 Handle Socket
66 1 Bolt
67 2 U-bolt
68 1 Fix Board
69 4 Spring Washer
70 4 Nut
71 1 Nut
72 1 Screw
73 1 Rod Joint
74 1 Pin
75 1 Frame Left
76 1 Frame Right
77 4 Washer
78 4 Bolt
79 1 Bed
80 4 Washer
81 4 Bolt
82 4 Washer
83 4 Bolt
84 4 Washer
85 4 Bolt
86 1 Cover Board
87 1 Bracket
88 1 Cylinder Pump
89 1 Y-Sealing Washer
90 1 Nylon Washer
91 1 Copper Washer
93 1 O-ring
94 1 Hex Nut
95 1 Spring
96 1 Washer
97 1 Pump Plunger
98 1 Washer
99 1 O-ring
100 1 Copper Washer
101 1 Piston
102 1 O-ring
103 1 O-ring
104 1 Sealing Washer
105 1 Copper Joint Ring
106 1 Air Hose (with Air Valve)
107 1 Washer
108 1 Bolt
110 1 Release Air Rod
111 1 O-ring
112 1 O-ring
113 1 Cylinder Cover
114 4 Bolt
115 1 Power Unit Assembly
116 1 Air Pump Assembly
117 3 Hairpin Clip
Page 3
Parts List & Operating Instructions Form No. 520698
Replacement Kits
Item
No. Qty. Description
Adapter 1 — No. 520712:
20 1 Extension Adapter
(20 mm x 68.5 mm dia.)
117 1 Hairpin Clip
Adapter 2 — No. 520713:
21 1 Extension Adapter
(20 mm x 48 mm dia.)
117 1 Hairpin Clip
Adapter 3 — No. 520714:
22 1 Extension Adapter
(60 mm x 48 mm dia.)
117 1 Hairpin Clip
Adapter 4 — No. 520715:
23 1 Extension Adapter
(100 mm x 48 mm dia.)
117 1 Hairpin Clip
Adapter Rack Assembly
No. 520711:
67 2 U-bolt
68 1 Fix Board
69 4 Spring Washer
70 4 Nut
Air Block Assembly
No. 520708:
18 3 Bolt
19 3 O-ring
27 1 Valve Block
28 1 Steel Ball
29 1 Pin
30 1 Steel Ball
31 1 Spring
32 1 Copper Washer
33 1 Bolt
34 1 Steel Ball
35 1 Ball Seat
36 1 Spring
37 1 Screw
38 1 Sealing Washer
39 1 Valve Plug Screw
50 1 Pin
Air Hose Kit
No. 520703:
105 1 Copper Joint Ring
106 1 Air Hose (w/ air valve)
107 1 Washer
108 1 Bolt
Air Pump Hardware
No. 520730:
88 1 Cylinder Pump
94 1 Hex Nut
95 1 Spring
96 1 Washer
97 1 Pump Plunger
101 1 Piston
110 1 Release Air Rod
113 1 Cylinder Cover
114 4 Bolt
Item
No. Qty. Description
Air Pump Kit
No. 520702:
116 1 Air Pump Assembly
Air Seal Kit
No. 520700:
89 1 Y-sealing Washer
90 1 Nylon Washer
91 1 Copper Washer
93 1 O-ring
98 1 Washer
99 1 O-ring
100 1 Copper Washer
102 1 O-ring
103 1 O-ring
104 1 Sealing Washer
105 1 Copper Joint Ring
111 1 O-ring
112 1 O-ring
Frame Kit
No. 521987:
75 1 Frame Left
76 1 Frame Right
87 1 Bracket
Handle Kit
No. 520704:
51 1 Knob
52 1 Pin
53 1 Rear Handle
54 1 Front Handle
55 2 Handle Sleeve
56 1 Sleeve
57 1 Lock Lever
58 1 Pin
59 2 Bolt
60 1 Spring
61 1 Control Rod A
62 1 Control Rod B
63 2 Convey Rod
64 1 Rod Joint
71 1 Nut
72 1 Screw
73 1 Rod Joint
74 1 Pin
Handle Pivot Kit
No. 520706:
65 1 Handle Socket
Handle Retaining Screw
No. 520710:
66 1 Bolt
Hardware Kit
No. 521988:
77 4 Washer
78 4 Bolt
80 4 Washer
81 4 Bolt
82 4 Washer
83 4 Bolt
84 4 Washer
85 4 Bolt
Item
No. Qty. Description
Hydraulic Seal Kit
No. 520699:
41Snap Ring
51Bushing
61O-ring
71Bushing
11 1 Washer
12 1 O-ring
13 1 Oil Filler Plug
19 3 O-ring
24 1 Piston Ring
25 1 Washer
26 1 Snap Ring
Hydraulic Unit Kit
No. 520701:
82 4 Washer
83 4 Bolt
115 1 Power Unit Assembly
Inspection Plate
No. 520729:
84 4 Washer
85 4 Bolt
86 1 Cover Board
Release Screw Assembly
No. 520707:
40 1 Steel Ball
41 1 Sealing Washer
42 1 Release Valve Rod
43 8 Rivet
44 1 Universal Joint A
45 2 Block
46 1 Universal Joint B
47 1 Rod
48 1 Universal Joint C
49 1 Universal Joint D
50 1 Pin
Return Spring Assembly
No. 520709:
31Spring Hanger
15 2 Nut
16 2 Spring
17 2 Bolt
Skid Plate
No. 520827:
79 1 Bed
80 4 Washer
81 4 Bolt
Wheel Kit
No. 520705:
11Snap Ring
21Wheel
© 2003 SPX Corporation
Sheet No. of 3
2
Issue Date: Rev. E August 3, 2005
Page 4
Parts List & Operating Instructions Form No. 520698, Sheet 2 of 3, back
Safety Precautions
WARNING: Failure to heed the following warnings can result in personal injury and / or equipment
damage. These warnings cannot cover every situation, so have safety foremost in your mind when
setting up a job.
Read, understand, and follow safety precautions and operating instructions. If the
•
operator cannot read these instructions, operating instructions and safety precautions
must be read and discussed in the operator’s native language.
Wear eye protection that meets the requirements of ANSI Z87.1 and OSHA.
•
Inspect the jack before each use; do not use the jack if it is damaged, altered, or in poor
•
condition.
To prevent tipping, set up the jack on a hard, level surface.
•
The load must not exceed the rated lifting capacity of the jack. Lift only dead weight.
•
Center the load on the jack saddle; off-center loads can damage the seals and cause
•
hydraulic failure.
Use the jack for lifting purposes only. This jack is designed to LIFT loads, not support
•
loads. Immediately support a lifted load with jack stands.
Stay clear of lifted loads.
•
The safety valve is set at the factory; no further adjustment is needed.
•
Use only approved hydraulic fluid, such as Chevron AW Hydraulic Oil MV or equivalent.
•
Setup Instructions
1. Add 1/2 oz. clean lubricating oil to the air inlet, and connect the air supply. IMPORTANT: To prevent damage
to the air pump, the air supply must be clean and dry.
2. Assemble the adapter holder to the handle using U-bolts, nuts, and spring washers provided. See Figure 1.
NOTE:
When not using the adapters, store them on the holder. Lock each adapter in place with a hitch pin.
U-bolt
Adapter
Holder
Figure 1
ll
l
ll
Spring,
Washers,
& Nuts
Operating Instructions
1. Tightly close the release valve knob (located on top of the “T” handle) by turning it clockwise.
2. Center the load on the jack saddle. Connect the air supply, and squeeze the air valve lever to raise the load.
Release the air valve lever to stop movement.
3. Transfer the load to support stands.
4. To lower the jack, open the release valve knob by SLOWLY turning it counterclockwise.
NOTE:
To adjust the handle, pull up and then release the lever to lock it in one of three positions.
Bleeding the Jack
Air bubbles can become trapped inside the hydraulic system, reducing the efficiency of the jack. Purge air from
the system as needed by following these steps:
1. With the jack sitting on its base and the ram retracted, bleed air by opening the release valve.
2. Pump for 10 seconds.
Page 5
Parts List & Operating Instructions Form No. 520698
Operating Instructions
Pump Prime Instructions
The air/hydraulic pump may lose its prime during shipment or after long
periods without use. To prime the pump, follow these steps:
Hex Socket
Bolt
Release
Valve
1. Remove the upper cover.
2. Loosen the hex socket bolt one-half turn. See Figure 2.
3. Close the release valve.
4. Operate the air pump while repeatedly tightening and loosening the bolt.
5. When the piston begins to rise, tighten the bolt. Verify the piston can rise
to the maximum height position.
Figure 2
Preventive Maintenance
IMPORTANT: Dirt is the greatest single cause of failure in hydraulic units. Keep the 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. When the jack is not in use, keep the piston and pump rods fully retracted. Store the jack on its base and in a well
protected area where it will not be exposed to corrosive vapors, abrasive dust, or any other harmful elements.
2. Maintain the oil level. If it’s necessary to add oil, remove the filler plug, and fill the reservoir with Chevron AW Hydraulic
Oil MV or equivalent.
3. Visually inspect the jack before each use. Take corrective action if any of the following problems are found:
a. Cracked or damaged housing e. Incorrectly functioning swivel heads or adj. screw
b. Excessive wear, bending, or other damage f. Loose hardware
c. Leaking hydraulic fluid g. Modified or altered equipment
d. Scored or damaged piston rod
Troubleshooting Guide
Repairs 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. Viscosity of oil too high
3. Ram sticking or binding
4. Internal leakage in ram
Ram does not advance 1. Release valve is open
2. Low/no oil in reservoir
3. Air locked system
4. Load is above capacity of system
5. Pump lost its prime
Ram only extends partially 1. Low oil level in reservoir
2. Piston rod is binding
Ram advances slowly 1. Low air pressure
2. Pump not working correctly
3. Leaking seals
Ram advances but doesn’t 1. Release valve is open
hold pressure 2. Ram seals are leaking
3. Pump check valve not working
4. Overload valve leaking / not adjusted 4. Replace / adjust overload valve.
Jack leaks oil 1. Worn or damaged seals
Ram will not retract, or 1. Release valve is closed
retracts slowly 2. Reservoir too full
3. Ram damaged internally
© 2003 SPX Corporation
1. With jack sitting on its base and ram retracted,
bleed air by opening release valve. Pump 10 seconds.
2. Change to a lower viscosity oil.
3. Look for dirt, gummy deposits, leaks, misalignment,
worn parts, or defective packings.
4. Replace worn packings. Look for excessive
contamination or wear.
1. Close release valve located on top of “T” handle.
2. Fill with oil & bleed system.
3. With jack sitting on its base and ram retracted,
open release valve, run pump for 10 seconds.
4. Use correct equipment.
5. Follow “Pump Prime Instructions.”
1. Fill reservoir with oil; bleed system.
2. Look for dirt, gummy deposits, leaks, misalignment,
worn parts, or defective packings.
1. Adjust air pressure to 90 –145 psi.
2. Rework pump.
3. Replace seals.
1. Close release valve located on top of T” handle.
2. Replace seals.
3. Clean / replace check valve.
1. Replace seals.
1. Open release valve.
2. Drain oil to correct level.
3. Take jack to authorized service center for repair.
Sheet No. of 3
Issue Date: Rev. E August 3, 2005
3
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