Komatsu PC88MR-10 Shop Manual page 217

Operation
(PC-C6V0-044-K-00-A)
When valve is in neutral
Ports (A) and (B) of the valve and ports (P1) and (P2) of the PPC valve are connected respectively
through fine control hole (f) of spool (1) to drain chamber (D).
PC88MR-10
10 Structure and function
Travel PPC valve
10-139