Komatsu ecot3 PC300LC-8 Shop Manual page 209

10 Structure, function and maintenance standard
4) When counter-rotated
a The illustration shows the circuit for travelling left reverse and right forward.
q When operating L.H. motor reverse [port (P1)
output] and R.H. motor forward [port (P4) out-
put], pressure of the R.H. spring chamber (l)
only rises high.
q Steering signal spool (j) strokes to the left to
output the steering signal to port (P6).
PC300, 350-8
SEN01995-01
17