COMPONENT OPERTATION / Control Valve Holding Operation: T450-03-03-017 1 - Check Valve 3 - Switch Valve 5 - Spring 7 - Orifice 2 - Piston 4 - Spring 6 - Check Valve 8 - Boom 1 Spool T3-3-29 2 3 4 1 5 6 7 4Pc3 From Boom Pressure Oil from Cylinder Bottom Pilot Pump (Return) Side 8 4Pc3 From re Oil from Cylin ump (Ret 8 From Cylin (Ret Boom der Bottom urn) Side Pressu Pilot P re Oil from ump 8