Grove Published 11-10-2014, Control # 524-00 6-7
RT880E SERVICE MANUAL SWING SYSTEM
Installation
1. Install a new O-ring onto the brake housing.
2. Place motor support plate on brake housing.
3. Apply Loctite 270 to socket capscrews. Install motor
support and brake onto gearbox and secure with the
socket capscrews. Torque the capscrews 34.9 to
42.4 lb-ft (49.9 to 60.6 Nm).
4. Install the swing motor into the swing brake according to
the installation procedures found under Swing Motor,
page 6-6.
5. Connect the hydraulic lines to the motor and brake.
6. Bleed all air from the brake assembly.
Testing
1. With the Swing Brake Switch in the ON position, position
the swing control lever in both directions. Superstructure
rotation should not occur.
2. Position the Swing Brake Switch to OFF and swing the
superstructure in both directions. Use the swing brake
pedal to stop rotation.
3. Check for hydraulic leaks and repair as necessary.
Gearbox
Removal
1. Engage the turntable lock pin.
2. Tag and disconnect the hydraulic lines from the swing
motor and swing brake. Cap and/or plug all openings
3. Remove the capscrews and lockwashers securing the
pinion guard. Remove the guard.
4. Remove the three bolts and plate attaching the pinion
gear to the output shaft and remove the pinion gear.
NOTE: The complete gearbox assembly with motor
weighs approximately 375 lb (170 kg).
5. Attach a suitable lifting device to the swing gearbox.
Remove the capscrews, washers and spacers securing
the gearbox to the mounting plate.
NOTE: Take note of the swing motor port orientation to
ensure proper installation.
6. Remove the swing gearbox.
7. If necessary, remove the swing motor according to the
removal procedures found under Swing Motor, page 6-6.
8. If necessary, remove the swing brake according to the
removal procedures found under Swing Gearbox and
Brake, page 6-6.
9. Cover the opening of the swing gearbox to ensure no
dirt, dust, etc., gets into the gearbox.
Installation
1. If removed, install the swing brake according to the
installation procedures found under Swing Gearbox and
Brake, page 6-6.
2. If removed, install the swing motor according to the
installation procedures found under Swing Motor, page
6-6.
3. Attach a suitable lifting device to the swing gearbox and
lift and position the swing gearbox in place on the
mounting plate.
4. Install the capscrews, washers and spacers. Torque
capscrews; refer to Fasteners and Torque Values, page
1-15 for proper torque value.
5. Install the pinion gear on the output shaft and secure
with three bolts. Torque 34.9 to 42.4 lb-ft (49 to
60.6 Nm).
6. Connect the hydraulic lines to the swing brake.
7. Connect the hydraulic lines to the swing motor.
8. Service the gearbox as indicated under Servicing, page
6-7.
Servicing
As with all highly stressed mechanisms, reasonable
operating procedures are always required. Normal
maintenance should only consist of proper lubrication and a
periodic check of mounting bolt torque values. Lubrication
consists of maintaining the gearbox oil level. Oil in a new
gearbox should be drained and flushed out after
approximately 250 hours of operation, and replaced with
premium quality SSGL-5 after approximately 500 hours of
operation or each year, whichever occurs first. Operation in
high humidity or polluted air areas will require more frequent
changes to minimize moisture or contaminate accumulation.
Change the oil as follows.
1. Unscrew the drain plug; remove the breather and dip-
stick to ensure all oil has been removed.
2. After oil is drained, replace the drain plug and any other
plugs that were removed to drain the oil.
3. Flush the case with a light flushing oil.
NOTE: Cleaning of the gearbox with a solvent is recom-
mended to prevent an accumulation of grit and
grime. Avoid steam cleaning where moisture and
dirt might be driven into the vent of the swing bear-
ing.
4. To refill with oil (see Figure 6-2), make sure the breather
is open. Insert oil through breather, fill until it reaches
proper location on dipstick.
5. Tighten the breather and dipstick.
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