Manitowoc Grove RT880E User Manual

Grove Published 11-10-2014, Control # 524-00 6-1
RT880E SERVICE MANUAL SWING SYSTEM
6
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 . . . . . . . . . . . . . . . . . . . 6-6
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
Swing Bearing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8
Swivels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12
Hydraulic Swivel . . . . . . . . . . . . . . . . . . . . . . . . . 6-14
Two Port Water Swivel . . . . . . . . . . . . . . . . . . . . 6-15
Electrical Swivel. . . . . . . . . . . . . . . . . . . . . . . . . . 6-16
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 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 front
console. The maximum rotation speed is 2.5 rpm in HIGH
speed and 1.25 rpm in LOW speed. Braking is accomplished
by depressing a glide swing brake pedal which is a
proportionate control valve that provides a controlled braking
of the swing motion.
The swing system consists of a hydraulic remote controller,
swing speed switch, series/parallel selector valve, a
directional control valve, the swing drives, the swing brake
assemblies, 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 a standard 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 is supplied by the
engine driven hydraulic Pump No. 1, Section 2 mounted on
the torque converter. 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 port and spring
pressure in the swing brake applies the brake. 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 port, overcoming the
brake spring pressure and releasing the swing brake.

Manitowoc Grove RT880E Specifications

General

Brand	Manitowoc
Model	Grove RT880E
Category	Construction Equipment
Language	English