UPPERSTRUCTURE / Control Valve 1 - Cap 15 - Cap (2 Used) 29 - O-Ring 43 - O-Ring (2 Used) 2 - O-Ring 16 - Cover 30 - Cap 44 - Cap (2 Used) 3 - Spring 17 - Check Valve (3 Used) 31 - Cap 45 - Cover (2 Used) 4 - Poppet 18 - Spring 32 - O-Ring 46 - O-Ring (2 Used) 5 - O-Ring 19 - Cap (3 Used) 33 - Spool 47 - Piston (2 Used) 6 - Backup Ring 20 - O-Ring 34 - Spring 48 - Spring (2 Used) 7 - Sleeve 21 - Spring 35 - Socket Bolt (8 Used) 49 - Check Valve (2 Used) 8 - O-Ring (10 Used) 22 - Poppet 36 - Flange 50 - Poppet 9 - Backup Ring 23 - Cap 37 - O-Ring (2 Used) 51 - Spring 10 - Socket Bolt (12 Used) 24 - Backup Ring (2 used) 38 - Housing (4-Spool Side) 52 - Spool 11 - Piston 25 - O-Ring (2 Used) 39 - Spring (2 Used) 53 - Poppet 12 - O-Ring 26 - Spring 40 - Spool 54 - O-Ring 13 - Cap 27 - Check Valve 41 - Guide (2 Used) 55 - Flange 14 - O-Ring (3 Used) 28 - Cap 42 - Spring W2-5-5