INTRODUCTION 16000 SERVICE/MAINTENANCE MANUAL
1-24
Published 05-03-17, Control # 228-03
Swing Holding Brake Switch
The swing holding brake switch on the side of the swing
control handle, holds the rotating bed in position (applies
swing park brake) for short periods when operating. To
prevent damage to the swing system, the swing holding
brake switch must only be applied when crane is at a
standstill.
When the holding brake switch is pressed in and held, an
input voltage is sent to the Node-1 controller. The Node-5
controller sends a zero output voltage to the shift swing
brake solenoid HS-1. The swing brake valve shifts to block
fluid to the brake and the swing brake is applied.
When the swing holding brake switch is released, an input
voltage is sent to the Node-1 controller. The Node-5
controller sends a 24 volt output to shift the swing brake
solenoid HS-1. The swing brake valve shifts, allowing system
pressure to hydraulically release the park brake.
FIGURE 1-13
HS-1
Item Description
1 Swing Handle Command in Percent
2 Swing Pump Command in Percent
3Swing Motors
4 Swing Brake Solenoid HS-1
5 Accessory Pump (Low Pressure)
6Swing Brake
7 Swing Brake Pressure Sensor
8 Swing Right Pressure Sensor
9 Swing Left Pressure Sensor
1
2
3
7 8
6
5
4
9
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