Komatsu PC88MR-10 Shop Manual page 174

10 Structure and function
Control valve
When right and left travels are operated (Including when one side travel is operated)
Function
Merge-divider spool (3) divides pump discharged pressures (PP1) and (PP2), and divides LS pressures
(PLS1), (PLS2), and (PLS3).
Whichever is the higher of pump discharged pressures (PP1) and (PP2) is output as the LS pressure.
Operation
When only R.H. and L.H. travels are operated, R.H. and L.H. travel PPC pressure switches generate
output, but work equipment PPC pressure switch does not generate output.
The controller generates output signal and the merge-divider valve generates output pressure.
When the output pressure reaches load at installed length of spring (4) (1.47 MPa {15 kg/cm
is pushed to the left.
Pump discharged pressures (PP1) and (PP2) are divided from each other and LS pressures (PLS1),
(PLS2), and (PLS3) are also divided from each other.
(PP1) and (PLS1) are supplied to the left travel circuit, and (PP2) and (PLS2) are supplied to the right
travel circuit.
Whichever is the higher of pump discharged pressures (PP1) and (PP2) is output as the LS pressure.
The pump swash plate angle becomes its maximum, and the maximum flow is discharged.
10-96
2 }), spool (3)
PC88MR-10