SWING SYSTEM RT880E SERVICE MANUAL
6-6 Published 11-10-2014, Control # 524-00
SWING MOTOR
Description
The swing motor is mounted on the swing brake housing and
drives the swing gearbox through the brake assembly. The
swing motor is a hydraulic gerotor type with low speed and
high torque characteristics. It has only three moving parts,
the commutator valve, the drive, and the gerotor star. The
motor has two ports for connection to the hydraulic system.
Maintenance
Removal
1. Ensure the swing brake and swing lock are engaged.
2. Clean the port area around the motor. Tag and discon-
nect the hydraulic hoses from the motor assembly. Cap
or plug all openings.
3. Unscrew the drain plug, remove the breather and dip-
stick to ensure that all oil has been removed. After the oil
has been drained, replace the drain plug and any other
plugs that may have been removed.
4. Remove the capscrews securing the motor and lift the
swing motor free of the motor support plate. Remove
and discard the O-ring from the groove in the swing
brake.
Installation
1. Install a new O-ring in the groove of the swing brake.
Position the swing motor on the swing brake, engaging
the shaft with the brake input shaft.
2. Apply Loctite® 243 to the capscrew threads. Install the
capscrews and secure the motor to the brake housing.
Torque the capscrews 44 to 72.2 lb-ft (85 to 103.2 Nm).
3. Connect the hydraulic lines to the swing motor as tagged
during removal.
Test
1. Test swing of superstructure in each direction. Stop and
start swing several times.
2. Inspect for hydraulic leaks and repair as necessary.
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 disassem-
bled 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 open-
ings.
3. Remove the swing motor from the swing brake accord-
ing to the removal procedures found under Swing Motor,
page 6-6.
4. While observing tension on the bolts, unscrew the
socket head capscrews securing the brake to the gear-
box. Remove the brake assembly in one piece with the
motor support plate.
5. Remove the bolts and washers securing the brake to the
gearbox. Remove the brake assembly.
6. Remove and discard the O-ring from the brake housing.
7. Cover the opening of the swing gearbox to ensure no
dirt, dust, etc., gets into the gearbox.
CAUTION
Oil can be hot and cause burns.
CAUTION
Pull straight up on the motor assembly to avoid damaging
the splined shaft.
CAUTION
Use care when engaging the swing motor drive gear, do
not force the shaft to engage.
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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