From inside (document excerpt):
Form No. 527900 Parts List & Operating Instructions for: 1521A Low Lift Transmission Jack Max. Capacity: 1,000 lbs. (500 kg) Hydraulic Unit Hardware and Handle Parts List Item No. Part No. Reqd. 17 1 18 2 Description Handle Grip Handle Rivet Rivet Socket Snap Ring Plunger Wiper Back-up Ring O-ring Pump Pump Seat Seal Ring Screw Spring Ball Screw O-ring Item No.
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Part No. Reqd. Description 19 1 Spring 20 1 Screw 21 1 Seal Ring 22 1 Spring 23 1 Screw 24 1 Seal Ring 25 1 Ball 26 1 Screw 27 1 O-ring 28 1 Screw 29 1 Spring 30 1 Ball Seat 31 1 Knob 32 1 Pin 33 1 Release Rod 34 2 Bolt 35 1 Valve Block 36 1 Oil Fill Plug Item No. Part No. Reqd. Description 37 1 Reservoir 38 1 O-ring 39 1 Ram 40 1 Retaining Ring 41 1 O-ring 42 1 Y-ring 43 1 Retaining Ring 44 1 Washer 45 1 O-ring 46 1 Retaining O-ring 47 1 Bushing 48 1 Piston Rod 49 1 O-ring Continued + Sheet No. 1 of 3 Issue Date: December 14, 2004 Rev. B 2004 SPX Corporation Parts List & Operating Instructions Form No. 527900, Sheet 1 of 3, Back Hydraulic Unit Base.