6-2 Published 11-22-2016, Control # 345-12
SWING SYSTEM RT9130E-2 SERVICE MANUAL
THEORY OF OPERATION
Swing Drive
The hydraulic power for the swing drive is supplied by the
engine driven hydraulic Pump No. 1. Oil flows from the pump
to the hydraulic Port 5 swivel. Flow from the swivel is routed
to the front steering flow divider valve in the swing directional
control valve. Bypass flow from the flow divider valve is used
to supply the swing directional control valve.
When the hydraulic remote control is positioned to select
right or left swing, the flow through the control valve is
directed to the series/parallel valve, and then routed to the
swing motors. If the Swing Brake selector switch is in the
OFF position, the superstructure will rotate in the desired
direction. Shifting the control to neutral and depressing the
brake pedal will stop the swing.
Swing Brake
The hydraulic power for the swing brake is supplied by the
pressure reducing/sequence valve in the swing brake and
armrest lockout manifold. With the Swing Brake selector
switch positioned to ON, the swing brake release valve
blocks the regulated flow to the brake release ports and
spring pressure in the swing brakes applies the brakes.
When the Swing Brake selector switch is positioned to OFF,
the regulated flow is directed from the pressure reducing/
sequence valve to the brake release ports, overcoming the
brake spring pressures and releasing the swing brakes.
Regulated flow from the pressure reducing/sequence valve
is also provided to the power brake valve where it is available
for the activation of the swing brake when the pedal is
depressed.
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