Komatsu ecot3 PC300LC-8 Shop Manual page 208

SEN01995-01
3) When steered or pivot-turned
a The Illustration shows the circuit for left forward (slow) and right forward (fast) operation.
q If the operation quantities of both levers are dif-
ferent from each other as in the steering opera-
tion (if the difference of the pilot pressure
between both sides is higher than a certain
level), the pilot pressure is output as the steer-
ing signal.
q The pressure in left spring chamber (k) of
steering signal spool (j) is (P2).
The pressure in right spring chamber (l) is
q
(P4).
q When the pressure state reaches [(P4 - P2) x
(Spool section) > Spring set load], the spool is
switched to the direction of the arrow.
16
10 Structure, function and maintenance standard
q Port (P4) pressure of the L.H. or R.H. PPC
valves, whichever having a higher output pres-
sure, is output to port (P6) as the steering sig-
nal.
PC300, 350-8