Bucket dump Bucket dump (3) B1 A1 b1 a1 P T Hydraulic circuit 76096WE57 When the pilot pressure is led to the port a1, the bucket spool moved to dump position. Oil from the pump flows to the cylinder port A1 and oil from the cylinder flows into the tank passage through the cylinder port B1. When the dumping speed of bucket is faster, the return oil from the large chamber of bucket cylinder combines with the oil from the pump through regeneration check valve (6), and flows into the small chamber of the cylinder. This prevents cylinder cavitation by the negative pressure when the pump flow cannot match the bucket dump speed.
6-32 6 a2 T P a1 A1 B1 LS A2 B2 pst Dump Floating Down Roll back Roll back Bucket Up Boo m b1 6 A2 B2 b2