Hyundai HX130LCR Manual page 103

Operating principle
②
a. When one of the RCV lever (1) is set to the operation position, the each spool is shifted to left
or right and the pilot oil flow is blocked. Then the pilot oil go to SH of the time delay valve (35).
This pressure moves spool (5) to the leftward against the force of the spring(8), so pilot pump
charged oil (P3) goes to the chamber G through port PG.
This pressure is applied to move the parking piston (15) to the upward against the force of the
brake spring (16). Thus, it releases the brake force.
16
15
1 RCV lever
2 Main control valve
5 Spool
8 Spring
15 Parking piston
16 Brake spring
Time delay valve
G
8
P3
2-59
5
SH
PG
1
2
140WF2SM36