Komatsu ecot3 PC300LC-8 Shop Manual page 166

SEN01994-01
2. When pilot pressure is turned OFF
Operation
q If pilot pressure (PST) from the solenoid valve
is 0, travel junction spool (2) is pressed by the
force of spring (1) against the right side and
the pass between ports (PTL) and (PTR) is
open.
40
10 Structure, function and maintenance standard
q If the oil flow rates to the L.H. and R.H. travel
motors become different from each other, the
oil flows through the route between port (PTL),
travel junction spool (2), and port (PTR) so that
the oil flow rates to both motors will be equal-
ized again.
PC300, 350-8