Komatsu ecot3 PC300LC-8 Shop Manual page 207

10 Structure, function and maintenance standard
2) During straight travel
a The Illustration shows the circuit for travelling straight forward.
q When operating L.H. motor forward [port (P2)
output] and R.H. motor forward [port (P4) out-
put], pressure of both L.H. spring chamber (k)
and R.H. spring chamber (l) rises high.
q Steering signal spool (j) remains at neutral
position and does not output a steering signal
to port (P6).
PC300, 350-8
SEN01995-01
15