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TMS800E SERVICE MANUAL SWING SYSTEM
Published 01-29-2014, Control # 496-00
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 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 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. While observing tension on the bolts, unscrew the
socket head capscrews securing the brake to the
gearbox. Remove the brake assembly in one piece with
the motor support plate.
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.
2. Place motor support plate on brake housing.
3. Apply Loctite® 270 to socket capscrews. Install motor
support and brake onto gearbox and secure with the
socket capscrews. Tighten the capscrews, refer to
Fasteners and Torque Values, page 1-13.
4. Install the swing motor into the swing brake according to
the procedures found in this Section under SWING
MOTOR - INSTALLATION.
5. Connect the hydraulic lines to the motor and brake.
6. Bleed all air from the brake assembly.
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 capscrews and lockwashers securing the
pinion guard. Remove the guard.
4. Remove the three bolts and plate attaching the pinion
gear to the output shaft and remove the pinion gear.
NOTE: The complete gearbox assembly with motor
weighs approximately 170 kg (375 lb).
5. Attach a suitable lifting device to the swing gearbox.
Remove the capscrews, washers and spacers 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.
CAUTION
Lock pin must be engaged or superstructure free swing
will occur when brake or gearbox is removed.
CAUTION
Use care when removing the capscrews securing the
brake, as there is tension on the bolts due to internal
brake springs.
CAUTION
Lock pin must be engaged or superstructure free swing
will occur when brake or gearbox is removed.
Reference Only
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