6-7
Published 3/26/2018, Control # 596-05
GRT8100 SERVICE MANUAL SWING SYSTEM
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 swing brake and swing lock are engaged.
2. Clean port area around motor. Tag and disconnect
hydraulic hoses from motor assembly. Cap or plug all
openings.
3. Unscrew drain plug, filler and level plugs, and drain oil.
After oil is drained, replace drain plug.
4. Remove two screws and separate motor from brake
flange. Remove and discard O-ring from groove in the
swing brake.
Installation
1. Install new O-ring in swing brake groove. Position swing
motor on swing brake.
2. Apply Loctite 243 on two screws. Install screws and
secure motor to brake housing. Torque screws 88 Nm to
107 Nm (65 lb-ft to 79 lb-ft).
3. Replace plugs and extensions. Fill assembly with oil.
Refer to Lubrication, page 9-1.
4. Connect hydraulic lines to 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.
CAUTION
Hydraulic oil can be hot and cause burns. Always wear
gloves and allow the hydraulic system to cool.
CAUTION
Pull straight up on motor assembly to avoid damaging
splined shaft.
CAUTION
Use care when engaging swing motor drive gear. Do not
force shaft to engage. Damage to gears may result
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