UPPERSTRUCTURE / Control Valve ASSEMBLE CONTROL VALVE (HOUSING FRONT AND REAR SURFACES) 2 1 1 2 Check Valve Figure of Control Valve (Rear) Figure of Control Valve (Front) 6 5 4 3 Section of Check Valve W1J1-02-05-050 1 - Housing (4-Spool Side) 3 - Check Valve 5 - O-Ring, Backup Ring 6 - Cap 2 - Housing (5-Spool Side) 4 - Spring W2-5-66