6-8 Published 11-22-2016, Control # 345-12
SWING SYSTEM RT9130E-2 SERVICE MANUAL
SWING BOX ASSEMBLIES
Description
There are two swing box assemblies (Figure 6-1) for turning
and stopping the turntable and superstructure. Each swing
box assembly consists of a hydraulic motor on top, a brake
assembly, and a swing gearbox on the bottom. Each swing
motor rotates the swing gearbox gear pinion output shaft
applying turning force to the turntable bearing’s gear teeth to
turn the turntable. Operator-controlled hydraulic power
applied to the brake assemblies stops the gearbox from
rotating.
Each swing motor runs on hydraulic power to drive its
gearbox. Each swing motor has two ports for connection to
the hydraulic system.
Each swing brake assembly is between the swing motor and
its gearbox. The brake assembly’s mechanism is a disc pack
that is hydraulically released and spring applied. The
operator steps on a pedal on the cab floor to trigger the
swing brake assemblies to stop the swing boxes from
turning. When the Swing Brake switch is ON it prevents the
swing brake assemblies from releasing; this prevents
inadvertent swing during travel or other situations when the
superstructure should not turn.
Each gearbox bolts to the superstructure base plate. Each
gearbox uses double reduction planetary gearing. The
gearbox’s pinion gear meshes with the ring gear of the
turntable bearing to rotate the turntable.
A filing plug in the top of the swing brake system assembly
housing allows the operator to add gear oil to the swing
gearbox and swing brake assembly. There is one drain plug
for draining gear oil from the gearbox housing.
There are hydraulic lines to each swing brake assembly;
these lines are in a system sealed from gear oil. The
hydraulic lines are only for applying or releasing the brake,
not providing brake or gearbox lubrication.
There are hydraulic lines to the swing motor; these lines are
also in a system sealed from gear oil. The hydraulic lines are
for driving the motor in the chosen rotation. There is one
drain plug for draining hydraulic oil from the swing motor.
Swing Motor Maintenance
NOTE: Each swing motor can be removed and
disassembled independently of the swing brake
assembly.
Removal
1. Engage the swing brake and the swing lock pin.
2. Clean the port area around the swing motor. Tag and
disconnect the hydraulic hoses from the swing motor.
Cap or plug all openings.
3. Unscrew the drain plug, and drain the oil. After oil is
drained, reinstall the drain plug
.
4. Remove the capscrews securing the swing motor to the
swing brake assembly housing flange. Remove and
discard the O-ring from the groove in the swing brake
assembly housing.
Installation
1. Install a new O-ring in the groove of the swing brake
assembly’s housing. Position the swing motor on the
swing brake.
2. Apply Loctite 243 on the capscrews. Secure the swing
motor to the swing brake assembly housing with the
capscrews.
3. If needed, fill the swing gear box with gear oil. Refer to
Lubrication, page 9-1.
4. Connect the hydraulic lines to the swing motor as tagged
during removal.
Testing
1. Test swing of superstructure in each direction. Stop and
start swing boxes several times.
2. Inspect for hydraulic leaks and repair as necessary.
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.
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