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Published 10-01-2020 Control # 699-00
SWING SYSTEM
GRT9165 SERVICE MANUAL
THEORY OF OPERATION
The GRT9165 features two combination swing drives and
brakes located on the right side of the superstructure.
Swing Drive
The hydraulic power for the swing drives Figure 6-1 is
supplied by the engine driven hydraulic pump. Oil flows from
the pump to the hydraulic swivel. Flow from the swivel is
routed to 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 Swing Motor. If the Swing Enable Switch is in
the ON 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 (static) swing brake is spring-applied, hydraulic released
while the service (dynamic) brake is pressure applied. A two
position solenoid valve controls the pressure to release the
swing brake. A pressure reducing valve maintains a pressure
of 260 to 300 psi to the inlet of both the brake releases and
brake apply valves. The circuit is designed such that when
the engine is running and the swing enable switch is
activated pressure is supplied to the swing brake release to
release the brake while at the same time pressure is
increased on the swing service brake proportionally to the
maximum pressure. When the swing control joystick is
actuated to swing left or right, the proportional valve is de-
energized there by releasing the pressure from the swing
service brake and allowing motion. When the swing joystick
is returned to the center (neutral) position, the control system
gradually re-energizes the proportional valve (apply valve),
thereby slowly increasing oil pressure to apply the brake.
Actuating the swing brake foot pedal results in the same
action.
Содержание Grove GRT9165
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