UPPERSTRUCTURE / Control Valve Assemble Check Valve 25. Install O-rings (7) (2 used) to plugs (8) (2 used). Install poppets (11) (2 used), springs (12) (2 used) and plugs (8) (2 used) to housing (1). 26. Install poppets (2, 15), springs (3) (2 used) and O-rings (4) (2 used) to housing (1). 27. Install flanges (5, 16) to housing (1) with socket bolts (6) (4 used). : 8 mm : 61 N m (6.2 kgf m, 45 lbf ft) 28. Install O-ring (102) to housing (1). Install cap (103) to housing (1) with socket bolts (104) (4 used). : 8 mm : 61 N m (6.2 kgf m, 45 lbf ft) W2-5-29