Spool in neutral Spool in neutral 3) (1) BOOM SECTION OPERATION BOOM SECTION OPERATION B2 A2 b2 a2 P T SX P Pst T Hydraulic circuit When the boom spool is in neutral position, oil from the pump will be blocked. Then, the pumps are at low pressure stand by. 74096WE51 6-28 LS a1 S a2 A1 B1 A2 B2 ) ( ) Dump Floating Down Rollback Up