Komatsu PC500LC-10R Shop Manual page 254

COMPONENT PARTS OF HYDRAULIC SYSTEM
ARM REGENERATION CIRCUIT OF CONTROL VALVE
FUNCTION OF ARM REGENERATION CIRCUIT OF CONTROL VALVE
When cylinder head pressure is higher than bottom pressure
1: Main pump
2: Arm valve spool
3: Pressure compensation valve
4: Suction safety valve
Cylinder speed is increased by the regeneration circuit from cylinder head to cylinder bottom during arm IN op-
eration, since the cylinder flow rate becomes pump discharged volume plus regenerated volume.
10-160
10 STRUCTURE AND FUNCTION
5: Suction valve
6: Check valve
7: LS shuttle valve
PC500LC-10R