UPPERSTRUCTURE / Control Valve Assemble Flow Combiner Valve 23. Install O-ring (57) to cap (64). Install spool (61), spacer (62), spring (63) and cap (64) to housing (1). : 46 mm : 250 N m (26 kgf m, 184 lbf ft) Assemble Check Valve-1 24. Install O-rings (57, 34) and backup ring (35) to cap (56). Install spring (36), check valve (37) and cap (56) to housing (1). : 350 N m (35.7 kgf m, 258 lbf ft) Assemble Check Valve-2 25. Install O-ring (57) and backup ring (59) to cap (60). Install spring (36), check valve (37) and cap (60) to housing (1). : 14 mm : 14 mm : 350 N m (35.7 kgf m, 258 lbf ft) W2-5-39