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6-4
Published 10-01-2020 Control # 699-00
SWING SYSTEM
GRT9165 SERVICE MANUAL
SWING MOTOR
Description
The Swing Motors are mounted on the swing brake housings
and drives the swing gearboxes through the brake
assemblies (6, Figure 6-1). The motors have two ports for
connections to the hydraulic system.
Maintenance
Use the following procedures to remove, install, and test
each swing motor.
Removal
1.
Ensure swing brakes 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 97.2 N-m
to 102.4 N-m (71.7 lb-ft to 75.5 lb-ft) in accordance with
torque specifications. For more information, see
3.
Replace plugs and extensions. Fill assembly with oil.
Refer to
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.
SWING GEARBOX AND BRAKE
Description
The Swing Gearbox and Brake (Figure 6-1), used with the
Swing Motor, rotates and stops the superstructure. A pedal
on the cab floor activates the Swing Brake (1). The Swing
Gearbox (2) is bolted to the superstructure base plate. Its
pinion gear meshes with the turntable bearing ring gear to
rotate the turntable.
Maintenance
NOTE:
Swing Brake can be removed and disassembled
independently of Swing Gearbox.
Swing Brake
Removal
1.
Engage turntable lock pin.
2.
Tag and disconnect hydraulic lines connected to swing
motor and brake. Cap and/or plug all openings.
3.
Remove swing motor from swing brake. For more
information, see
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
3
1
4
2
FIGURE 6-2
10171
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