6. MAIN CONTROL VALVE STRUCTURE (1/3) В Type : Closed center, Load pressure - Independent - Flow - Distribution 1) B LS a3 b3 A3 B3 a2 A2 B2 b2 a1 A1 B1 b1 A T Pst P VIEW A VIEW B P LS Pst T Hydraulic circuit 75796WE10 a1 a2 A1 B1 a3 A2 B2 A3 B3 Dump Roll back Floating Down Bucket Up Boom A ux b1 b2 b3 Port Port name Port size P From main pump 1 5/16-12UN T To hydraulic tank 1 5/16-12UN A1, B1 To bucket cylinder port 1 5/16-12UN A2, B2 To boom cylinder port 1 5/16-12UN a1, b1 Bucket pilot port 11/16-16UN a2, b2 Boom pilot port 11/16-16UN a3, b3 Auxiliary pilot port 11/16-16UN LS Load sensing port 9/16-18UNF Pst To RCV P port 9/16-18UNF 6-22