Komatsu PC500LC-10R Shop Manual page 240

COMPONENT PARTS OF HYDRAULIC SYSTEM
When load pressure is higher than other actuator in combined operation, in sin-
gle operation, or at maximum load pressure
1: Main pump
2: Valve
3: Shuttle valve
• Pressure compensation valve works as a load check valve.
• When pump pressure (LS pressure) is lower than the load on port (c), shuttle valve (3) in pressure compen-
sation valve piston (4) connects spring chamber (E) and port (c).
• Piston (4) and valve (2) are moved in the closing direction by the force of spring (5).
• When high peak pressure occurs in the actuator circuit or when continuous repeated peak pressure occurs
(example: when the breaker is used), valve (2) collides with valve chamber seat (C), and high pressure can
occur.
To prevent this, the pressure compensation valve having
valve (2) and piston (4) as one unit in it is used.
10-146
10 STRUCTURE AND FUNCTION
4: Piston
5: Spring
6. LS shuttle valve
PC500LC-10R