COMPONENT OPERTATION / Signal Control Valve During boom raising operation (Shockless operation) Clearance C Spring A Port A Spool Inner Passage 1 Spring B Oil Chamber Inner Passage 2 Port 1 T183-03-06-005 Port A Spool T183-03-06-004 Port 1 Oil Chamber Inner Passage 2 Detail of Clearance C Spool T1V1-03-06-008 T3-6-13 Housing