Komatsu ecot3 PC300LC-8 Shop Manual page 119

10 Structure, function and maintenance standard
q The relationship between the average pump
pressure (PP1 + PP2)/2 and servo piston (9) in
terms of their positions can be represented by
the broken line in the figure springs (4) and (6)
form the double springs.
q The relationship between the average pump
pressure (PP1 + PP2)/2 and average pump
delivery (Q) becomes as shown below.
q If command voltage (X) sent to PC-EPC valve
solenoid (1) increases further, the relationship
between average pump pressure (PP1 + PP2)/
2, and pump delivery (Q) is proportional to the
force of the PC-EPC valve solenoid and moves
in parallel.
q Namely, the force of PC-EPC valve solenoid
(1) is added to the pushing force to the right
because of the pump pressure applied to the
spool (3), so the relationship between the aver-
age pump pressure (PP1 + PP2)/2 and the
pump delivery (Q) moves from (A) to (B) as the
command current (X) is increased.
PC300, 350-8
SEN01993-00
23