Komatsu PC500LC-10R Shop Manual page 253

10 STRUCTURE AND FUNCTION COMPONENT PARTS OF HYDRAULIC SYSTEM
OPERATION OF BOOM REGENERATION CIRCUIT OF CONTROL VALVE
When the cylinder head pressure is lower than the bottom pressure (when hy-
draulic drift, etc.)
When the cylinder head pressure is lower than the bottom pressure, some of pressurized oil (A) from the cylin-
der bottom flows to drain circuit (B) from the notch of boom spool (2).
The remaining oil flows to regeneration circuit (C), opens check valve (6) and flows to the cylinder bottom
through circuit (D).
The flows from regeneration circuit (C) and main pump (1) merge in circuit (E).
PC500LC-10R 10-159