Swing Gearbox And Brake; Description; Maintenance - Manitowoc Grove RT765E-2 Service And Maintenance Manual

SWING SYSTEM

SWING GEARBOX AND BRAKE

Description

The Swing Gearbox and Brake (Figure 6-1), used in
conjunction with the Swing Motor, rotates and stops the
superstructure. A pedal on the cab floor is used to activate
the Swing Brake. The Swing Gearbox is bolted to the
superstructure base plate, and its pinion gear meshes with
the ring gear of the turntable bearing to rotate the turntable.
The Swing Gearbox utilizes double reduction planetary
gearing. The multi-disc swing brake assembly is an integral
part of the Swing Gearbox and is located between the swing
Motor and the swing Gearbox. The brake mechanism is a
disc pack that is hydraulically released and spring applied.

Maintenance

NOTE: The Swing Brake
d i s a s s e m b l e d i n d e p e n d e n t l y o f t h e S w i n g
Gearbox.
Swing Brake
Removal
1. Engage the turntable lock pin.
2. Tag and disconnect the hydraulic lines connected to the
swing motor and the brake. Cap and/or plug all
openings.
3. Remove the swing motor from the swing brake
according to the procedures found in this Section under
Swing Motor - Removal.
4. Remove the bolts and washers securing the brake to the
gearbox. Remove the brake assembly.
5. Remove and discard the O-ring from the brake housing.
6. Cover the opening of the swing gearbox to ensure no
dirt, dust, etc., gets into the gearbox.
Installation
1. Install a new O-ring onto the brake housing and insert
the brake assembly into the gearbox. Secure with the
eight socket head capscrews.
2. Install the swing motor into the swing brake according to
the procedures found in this Section under Swing Motor
- Installation.
3. Connect the hydraulic lines to the motor and brake.
4. Bleed all air from the brake assembly.
6-8
can be removed and
Published 9-04-2014, Control # 422-08
RT765E-2 SERVICE MANUAL
Testing
1. With the Swing Brake switch in the ON position, position
the swing control lever in both directions. Superstructure
rotation should not occur.
2. Position the Swing Brake switch to OFF and swing the
superstructure in both directions. Use the swing brake
pedal to stop rotation.
3. Check for hydraulic leaks and repair as necessary.
Gearbox
Removal
1. Engage the turntable lock pin.
2. Tag and disconnect the hydraulic lines from the swing
motor and swing brake. Cap and/or plug all openings.
3. Remove the three bolts attaching the pinion gear to the
output shaft and remove the pinion gear.
NOTE: The complete gearbox assembly with motor
weighs approximately 333 lb (150 kg).
4. Attach a suitable lifting device to the swing gearbox.
Remove the capscrews, washers and bushings securing
the gearbox to the mounting plate.
5. Remove the swing gearbox.
6. If necessary, remove the swing motor according to the
procedures found in this Section under Swing Motor -
Removal.
7. If necessary, remove the swing brake according to the
procedures found in this Section under Swing Brake
Removal.
8. Cover the opening of the swing gearbox to ensure no
dirt, dust, etc., gets into the gearbox.
Installation
1. If removed, install the swing brake according to the
procedures found in this Section under Swing Brake -
Installation.
2. If removed, install the swing motor according to the
procedures found in this Section under Swing Motor -
Installation.
3. Attach a suitable lifting device to the swing gearbox and
lift and position the swing gearbox in place on the
mounting plate.
4. Install the capscrews, washers and bushings. Torque
capscrews; refer to Fasteners and Torque Values, page
1-16 for proper torque value.
5. Install the pinion gear on the output shaft and secure
with three bolts. Torque to 52 to 63 lb-ft (70.2 to
85.2 Nm).