Komatsu Galeo BR380JG-1E0 Shop Manual page 102

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Table of Contents

10 Structure, function and maintenance standard

PA2 : Pump pressure pilot port

PDP : Drain port

PM : Mode selector pressure pilot port

PPL : Control pressure output port (to LS valve)

When the pump discharge pressure (PP1)

(self-pressure) and (PP2) (other pump pres-

sure) are high, the PC valve controls the pump

so that the volume of oil beyond the discharge

pressure-based specific flowrate may not be

conducted however you may increase the con-

trol valve stroke. Namely it is intended at con-

trolling the horse power for the pumps so that it

may not exceed the engine hose power.

If the pump discharge pressure increases due

to increased load during operation, this valve

decreases the pump delivery.

And if the pump delivery pressure goes low, it

increases the pump delivery.

In this case, relation between the mean dis-

charge pressure of the front and rear pumps

[(PP1) + (PP2)]/2 and the pump delivery (Q)

will becomes as shown in the diagram if the

relation is represented as the parameter the

current value (X) to be given to PC-EPC valve

The controller continues counting the actual

engine speed.

If the engine speed is slowed down due to

increased load, the controller reduces the

pump delivery to recover the speed.

Servo piston assembly

If the engine speed goes below the specified

value because of increased load, the controller

sends a command current to PC-EPC valve

solenoid in order to reduce the slope angle in

proportion to reduction in the engine speed.

Troubleshooting