UNDERCARRIAGE RT880E SERVICE MANUAL
8-22 Published 11-10-2014, Control # 524-00
5. Connect the hydraulic brake line to the inlet fitting.
6. Bleed the brake system.
7. Apply and release the brakes three times to ensure the
caliper operates correctly. Check for fluid leaks. Ensure
the linings move freely.
PARKING BRAKE ACTUATOR
Description
The spring-applied, hydraulically-released parking brake
actuator is located on the front axle and is used to apply and
release the parking brake.
Maintenance
Removal
1. Chock the wheels to prevent crane movement.
2. Start the engine, ensure the transmission is in neutral,
and position the Park Brake Switch to OFF. This will
pressurize the brake actuator to release the tension on
the brake linkage. Engine must remain running. Air pres-
sure of 270 psi (1862 kPa/18.6 bar) may be used to
pressurize the actuator.
3. Remove the capscrews holding actuator to the brake
caliper, and slide the actuator off the actuator rod.
4. Position the Park Brake Switch to ON and shut down the
engine.
5. Disconnect the hydraulic line from the brake actuator,
then cap or plug all openings.
Installation
1. Connect the hydraulic line to the brake actuator.
2. Start the engine, ensure the transmission is in neutral,
and position the Park Brake Switch to OFF. This will
pressurize the brake actuator to release the tension on
the brake linkage. Engine must remain running. Air pres-
sure of 270 psi (1862 kPa/18.6 bar) may be used to
pressurize the actuator.
3. Slide the actuator over the actuator rod and install the
capscrews to attach the actuator to the caliper.
4. Position the Park Brake Switch to ON and shut down the
engine.
Adjustment
1. Chock the wheels to prevent crane movement.
2. Start the engine, ensure the transmission is in neutral,
and position the Park Brake Switch to OFF. This will
pressurize the brake actuator to release the tension on
the brake linkage. Air pressure of 270 psi (1862 kPa/
18.6 bar) may be used to pressurize the actuator. Screw
the caging nut up under the actuator chamber.
3. Install the rod ball joint until the ball joint will just connect
to the brake linkage with the brake lever in a horizontal
position.
4. Lock the rod ball joint with the jam nut and back off the
caging nut.
5. Position the Park Brake Switch to ON and shut down the
engine.
Disc Centered
Between Linings
FIGURE 8-27
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