Replacement Parts Kits for the Hydraulic Assembly
Bleeding Air from the System
No. 66310-12 Seal Kit contains:
Item
No.
Qty.
Description
43
1
Reservoir Bottom Seal Ring
45
1
Reservoir Top Seal Ring
46
1
O-Ring (29.6 x 3.5)
49
1
O-Ring Retainer
50
1
O-Ring (31 x 4.6)
52
1
Cylinder Copper Seal Ring
60
3
O-Ring (7.1 x 1.8)
65
2
Piston Housing Copper Seal Ring
67
1
O-Ring
77
2
O-Ring (15 x 2.65)
No. 66310-14 U-Joint Kit contains:
Item
No.
Qty.
Description
74
1
U-Joint
75
1
Steel Ball (6 mm)
No. 66310-13 Hydraulic Hardware Kit contains:
Item
No.
Qty.
Description
54
1
Steel Ball (7.5 mm)
55
1
Low Relief Valve Spring
56
1
Steel Ball (4 mm)
57
1
Spring Retainer
58
1
High Relief Valve Spring
59
1
High Relief Valve Set Screw
60
3
O-Ring (7.1 x 1.8)
61
3
Relief Valve Cover Screw
62
1
Steel Ball (8 mm)
63
1
Low Relief Valve Set Screw
64
2
Steel Ball (5 mm)
No. 66310-15 Pump Station Kit contains:
Item
No.
Qty.
Description
64
2
Steel Ball (5 mm)
65
2
Piston Housing Copper Seal Ring
66
1
High Pressure Piston Housing
67
1
O-Ring
68
1
Circlip (15 x 11 x 3)
69
1
High Pressure Piston
70
1
High Pressure Piston Return Spring
71
1
High Pressure Piston Dust Cover
72
1
Return Spring Holder (15)
73
1
Circlip (15)
76
1
Low Pressure Piston Housing
77
2
O-Ring (15 x 2.65)
78
1
Low Pressure Piston
79
1
Low Pressure Piston Return Spring
80
1
Low Pressure Piston Dust Cover
81
1
Return Spring Holder (20)
82
1
Circlip (20)
Air can accumulate within a hydraulic system during shipment or if the oil supply runs too low. This entrapped air causes
the jack to respond slowly or feel “spongy.” The following procedure bleeds air from the system.
1. Remove the jack from service, and place it on a level surface.
2. Open the release valve by turning the handle all the way counterclockwise (CCW).
3. Pump the handle six full strokes.
4. Close the release valve by turning the handle all the way clockwise (CW).
5. Pump the handle until the lift arm is fully extended.
6. Lower the lift arm by turning the handle all the way counterclockwise (CCW).
7. Test the jack for normal operation. If the saddle doesn’t rise to the correct height, repeat Steps 2–6. If this doesn’t
solve the problem, call the Jackco Technical Services Dept. at (888) 4JACKCO.
