UPPERSTRUCTURE / Control Valve Disassemble Load Check Valve 17. Remove cap (23), spring (26) and check valve (27) from housing (38). : 14 mm 18. When replacing O-ring (25), remove cap (30) from housing (38). 19. When replacing O-ring (29), remove cap (28) from housing (38). 20. When replacing O-rings (37, 54), remove flanges (36, 55) from housing (38). W2-5-9