Theory of Operation
BOOM REGENERATIVE VALVE OPERATION
valve check valve (E) open and flows to the rod end.
The function of boom regenerative valve (J) during
All return oil from the head end of boom cylinders
boom down operation is to combine the return oil from
pushes the check valve (H) at the top of the boom I
head end of boom cylinders with the front pump (B)
spool open and flows to the return passage (D).
The boom I power passage lift check valve (E)
During boom down operation, if front pump supply oil
prevents back flow through the control valve.
pressure is lower than the return oil pressure from the
head end the return oil pushes the boom regenerative
Continued on next page