Komatsu Galeo PC800-8 Shop Manual page 217

Hydraulic excavator

Table of Contents

10 Structure, function and maintenance standard

When solenoid is de-energized

The signal current does not flow from the control-

ler, so coil (3) is de-energized.

For this reason, spool (4) is returned to the neu-

tral position by spring (6).

As a result, the circuit between ports P and A is

connected, and the pressurized oil from the

PPC valve flows to the control valve.

When solenoid is energized

When the signal current flows from the controller

to coil (3), coil (3) is energized and movable iron

core (2) is pushed to the right in the direction of

For this reason, spool (4) is also pushed to the

right in the direction of the arrow.

As a result, port P is closed, and the pressure oil

from the control pump does not flow to the con-

At the same time, port A and port T are intercon-

nected, and the oil from the control valve is

drained to the tank.

PC800, 850-8

1. Connector

2. Movable iron core

Chapters

Table of Contents