Komatsu PC88MR-10 Shop Manual page 270

10 Structure and function
Electrical control system
PPC lock function
a PPC: Abbreviation for Proportional Pressure Control
1. Battery disconnect switch
2. Battery
3. Battery relay
4. Fusible link
5. Fuse box
6. Starting switch
7. Lock lever
8. PPC lock switch
9. Main pump
10. Control valve
10a. Merge-divider valve
10b. Self-pressure reducing valve
11. PPC lock solenoid valve
12. Lock lever automatic lock cancel switch
13. Pump controller
14. PPC lock lever relay
15. 1st-line attachment flow adjustment EPC valve
Input/output signal
a: PPC lock switch signal
b: 1st-line attachment flow adjustment EPC valve signal
c: Lock lever automatic lock signal
Function
PPC lock switch (8) is interlocked with lock lever (7). When lock lever (7) is set to "LOCK" position, PPC
lock switch (8) is turned to OFF position.
When PPC lock switch (8) is turned to "OFF" position, the current flowing into PPC lock solenoid valve
(11) is cut out and the work equipment and machine body do not move even if any control lever or pedal is
operated.
10-192
(PC88MR-PX16-042-K-00-A)
PC88MR-10