Komatsu PC200-8M0 Shop Manual page 134

SEN06119-00
The relationship between the average pump
q
pressure (PP1 + PP2)/2 and average pump
discharge (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 discharge (Q) is proportional to
the force of the PC-EPC valve solenoid and
moves in parallel.
Namely, the force of PC-EPC valve solenoid
q
(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 discharge (Q) moves from (A) to (B) as
the command current (X) is increased.
22
10-401
401 Hydraulic system, Part 1
Hydraulic pump
PC200, 200LC, 220, 220LC-8M0