6-8
Published 10/19/2017, Control # 618-00
SWING SYSTEM GRT880 SERVICE MANUAL
SWING GEARBOX AND BRAKE
Description
The Swing Gearbox and Brake Figure 6-1, used with the
Swing Motor, rotates and stops the superstructure. A pedal
on the cab floor activates the Swing Brake. The Swing
Gearbox is bolted to the superstructure base plate. Its pinion
gear meshes with the turntable bearing ring gear to rotate the
turntable.
The Swing Gearbox uses 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 Swing Gearbox. The brake mechanism is a disc
pack that is hydraulically released and spring applied.
Maintenance
NOTE: Swing Brake can be removed and disassembled
independently of Swing Gearbox.
Swing Brake
Removal
1. Engage turntable lock pin.
2. Tag and disconnect hydraulic lines connected to swing
motor and brake. Cap and/or plug all openings.
3. Remove swing motor from swing brake following Swing
Motor - Removal procedures in this Section.
4. Remove bolts and washers securing brake to gearbox.
Remove brake assembly.
5. Remove and discard the O-ring from the brake housing.
6. Cover swing gearbox opening 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 swing motor into the swing brake according to the
procedures found in this Section under Swing Motor -
Installation.
3. Connect hydraulic lines to motor and brake.
4. Bleed air from brake assembly.
Testing
1. WithSwing Brake switch in the ON position, position the
swing joystick in both directions. Superstructure rotation
should not occur.
2. Position Swing Brake switch to OFF and swing
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 turntable lock pin.
2. Tag and disconnect hydraulic lines from swing motor
and swing brake. Cap and/or plug all openings.
3. Remove three bolts attaching pinion gear to output shaft.
Remove pinion gear.
NOTE: Gearbox assembly with motor weighs
approximately 150 kg (333 lb).
4. Attach a suitable lifting device to the swing gearbox.
Remove capscrews, washers, and bushings securing
gearbox to mounting plate.
5. Remove swing gearbox.
6. If necessary, remove swing motor according to the
procedures found in this Section under Swing Motor -
Removal.
7. If necessary, remove swing brake according to the
procedures found in this Section under Swing Brake
Removal.
8. Cover swing gearbox opening to ensure no dirt, dust,
etc., gets into the gearbox.
Installation
1. If removed, install swing brake according to the
procedures found in this Section under Swing Brake -
Installation.
2. If removed, install 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 capscrews, washers, and bushings. Torque
capscrews; refer to Fasteners and Torque Values, page
1-15 for proper torque value.
5. Install pinion gear on output shaft. Secure with three
bolts. Torque to 70.2 Nm to 85.2 Nm (52 lb-ft to 63 lb-ft).
6. Connect hydraulic lines to swing brake.
7. Connect hydraulic lines to swing motor.
8. Service gearbox as indicated under Servicing.
Servicing
As with all highly stressed mechanisms, reasonable
operating procedures are always required. Normal
maintenance should only consist of proper lubrication and a
periodic check of mounting bolt torque values. Lubrication
Reference Only
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