Komatsu PC500LC-10R Shop Manual page 228

COMPONENT PARTS OF HYDRAULIC SYSTEM 10 STRUCTURE AND FUNCTION
CONTROL VALVE
STRUCTURE OF CONTROL VALVE
The control valve consists of a 6-spool valve (single unit type), Hi-valve, and a service valve. It is equipped with
a merge-divider valve, variable back pressure valve, boom hydraulic drift prevention valve, and arm quick return
valve.
Since these valves are formed in one unit with connecting bolts and the passages are connected inside, the
control valve is compact and serviced very easily.
The structure of this control valve is simple with actuator-to-spool type.
The structure of the 8-spool valve (6-spool valve with Hi-valve and service valve) is explained below.
10-134 PC500LC-10R