Published 4-20-2015, Control # 502-01 6-1
RT540E SERVICE MANUAL SWING SYSTEM
SECTION 6
SWING SYSTEM
SECTION CONTENTS
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . 6-1
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
Swing Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
Swing Gearbox And Brake. . . . . . . . . . . . . . . . . . . 6-7
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
Swing Bearing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9
Swivels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-14
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-14
Hydraulic Swivel . . . . . . . . . . . . . . . . . . . . . . . . . 6-16
Electrical Swivel. . . . . . . . . . . . . . . . . . . . . . . . . . 6-18
INTRODUCTION
Description
The purpose of the swing system is to allow the crane
superstructure to rotate atop the carrier frame. The
superstructure swing system provides full 360 degree
rotation in both directions and is equipped with free swing
capabilities. The term free swing means that, with the
SWING BRAKE switch in the OFF position, the
superstructure will swing freely after the SWING control lever
is released until it coasts to a stop or the glide swing brake
pedal is depressed.
Swing is activated using the Swing Enable Switch and the
control lever in the cab. When the swing lever is actuated,
hydraulic pressure is routed to the swing motor to drive the
gearbox in the appropriate direction. As the gearbox rotates,
the pinion gear meshes with the teeth on the swing bearing
and rotates the superstructure. Swing speed can be
controlled by the control lever and a HIGH/LOW swing speed
switch on the joystick. The maximum rotation speed is 2.0
rpm with no load. Positioning the lever to the left or right
actuates a control valve through electric signal to provide
360 degree continuous rotation in the desired direction.
Braking is accomplished by moving the control lever to the
center and applying Swing Brake Pedal or engaging the
Swing Brake Switch.
The swing system consists of a electric remote controller,
swing speed switch, a directional control valve, the swing
drive, the swing brake assembly, the brake pedal and power
brake valve, and a swing brake release solenoid valve.
The crane is equipped with a pin type turntable lock as
standard and an optional 360 degree positive swing lock.
The 360 degree positive swing lock meshes with the swing
gear teeth at any point of rotation. The pin type turntable lock
will only lock the turntable in a straight ahead position over
the front of machine. Both swing locks are operated from the
cab.
Theory of Operation
Swing Drive
The hydraulic power for the swing drive (Figure 6-1) is
supplied by the engine driven hydraulic pump. Oil flows from
the pump to the hydraulic Port 5 swivel. Flow from the swivel
is routed to the service brake dual accumulator charge valve.
Bypass flow from the dual accumulator charge valve 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 electric 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 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.
Reference Only
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