Published 4-20-2015, Control # 502-01 6-7
RT540E SERVICE MANUAL SWING SYSTEM
SWING GEARBOX AND BRAKE
Description
The swing gearbox and brake, 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 gearboxes are 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 can be removed and
disassembled independently of the swing 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. Unscrew the screws securing the brake to the gearbox.
Lift the brake using the brake flange, then remove the O-
ring.
5. 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.
2. Apply Loctite 243 to the screws. Install brake onto
gearbox and secure with the screws. Torque the screws
50 to 60 Nm (36.8 to 44.2 lb-ft).
3. Install the swing motor into the swing brake according to
the procedures found in this Section under SWING
MOTOR - INSTALLATION.
4. Connect the hydraulic lines to the motor and brake.
5. Bleed all air from the brake assembly.
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. Unscrew the three screws securing the pinion gear
cover. Remove the cover.
4. Remove the gear from the shaft.
NOTE: The complete gearbox assembly with motor
weighs approximately 126 kg (277.7 lb).
5. Attach a suitable lifting device to the swing gearbox.
Remove the capscrews, flatwashers and bushings
securing the gearbox to the mounting plate.
NOTE: Take note of the swing motor port orientation to
ensure proper installation.
6. Remove the swing gearbox.
7. If necessary, remove the swing motor according to the
procedures found in this Section under SWING MOTOR
REMOVAL.
8. If necessary, remove the swing brake according to the
procedures found in this Section under SWING BRAKE
REMOVAL.
9. 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, flatwashers and bushings. Torque
the capscrews 85 to 93 Nm (63 to 69 lb-ft).
5. Apply Loctite 243 to screws. Install the pinion gear on
the output shaft. Install the cover and secure with three
screws. Torque screws 50 Nm (36.8 lb-ft).
6. Connect the hydraulic lines to the swing brake.
7. Connect the hydraulic lines to the swing motor.
8. Service the gearbox as indicated under SERVICING.
CAUTION
Use care when removing the capscrews securing the
brake, as there is tension on the bolts due to internal
brake springs.
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