60 - 2
Operation
Hydraulic Brake Release
The pilot pressure (40 kgf/cm
2
) enters P port of A section and
passes through the outer periphery of the sleeve of the
solenoid valve for slew brake and enters passageway a.
It then passes the lower side of the inner passage way of the
reducing spool and enters gallery b. Gallery b is connected
to the C passageway of the B section.
The pressurised oil which entered C passageway pushes up
the steel ball and passes through the outer periphery of the
spool of the solenoid valve for slew lock and exhausts
through B port. The pressure of 40 kgf/cm
2
enters the brake
gallery of the slew motor and releases the mechanical brake.
Section E
Hydraulics
9803/6400
Section E
60 - 2
Issue 2*
Stacked (Slew Brake) Valve
*
*
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