Swing Motor; Description; Maintenance - Manitowoc Grove RT770E Service Maintenance Manual

RT770E

SWING MOTOR

Description

The Swing Motor is mounted on the swing brake housing
and drives the swing gearbox through the brake assembly
(Figure 6-1). 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
disconnect the hydraulic hoses from the motor
assembly. Cap or plug all openings.
WARNING
Hydraulic oil can be hot and cause burns. Always wear
gloves and allow the hydraulic system to cool.
3. Unscrew the drain plug, filler and level plugs, and drain
the oil. After oil is drained, replace the drain plug.
CAUTION
Pull straight up on the motor assembly to avoid damaging
the splined shaft.
GROVE
4. Remove the two screws and separate the motor from
the brake flange. Remove and discard the O-ring from
the groove in the swing brake.
Installation
Use care when engaging the swing motor drive gear; do
not force the shaft to engage. Damage to the gears may
result
1. Install a new O-ring in the groove of the swing brake.
Position the swing motor on the swing brake.
2. Apply Loctite 243 on the two screws. Install the screws
and secure the motor to the brake housing. Torque the
screws to 88 Nm to 107 Nm (65 lb-ft to 79 lb-ft).
3. Replace plugs, extensions, and fill the assembly with oil.
Refer to Lubrication, page 9-1.
4. 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.
Published 11/26/2014, Control # 447-05
SWING SYSTEM
CAUTION
6
6-7