Published 08-25-09, Control # 077-04 8-23
RT9130E SERVICE MANUAL UNDERCARRIAGE
7. Apply hydraulic pressure to the brake.
8. With plug removed, loosen coupling nut and set running
clearance 0.020 - 0.030 inch total by adjusting the
socket setscrew. Torque the coupling nut 67.7 to 74.5
Nm (50 to 55 pounds-foot) while holding the socket
setscrew in position.
9. Replace plug. Torque 61 to 67.7 Nm (45 to 50 pounds-
foot).
10. Even up the running clearance of the pads 0.254 to
0.381 mm (0.010 to 0.015 inch) each side by adjusting
the socket head capscrew.
11. Readjust the brake when running clearance reaches a
total of 2.54 mm (0.100 inch).
Park Brake Solenoid Valve
Description
The park brake solenoid valve is located on the right side
frame rail in front of the rear axle. The valve is a three-way,
two position solenoid valve. The park brake valve is used to
control the application of the crane’s spring-applied,
hydraulically-released parking brake.
Positioning the PARK BRAKE switch to OFF shifts the three-
way, two-position solenoid valve so hydraulic oil can flow to
the parking brake actuator, extending it. When the actuator
extends, it releases the park brake.
Positioning the PARK BRAKE switch to ON shifts the three-
way, two-position solenoid valve so hydraulic oil can drain
from the actuator. The parking brake actuator’s rod retracts,
forcing hydraulic oil through the valve and the case drain
manifold back to the transmission reservoir. As the actuator
retracts, it applies the parking brake.
A pressure switch is installed in the line to the actuator.
When the park brake is applied, a lack of hydraulic oil
pressure keeps the pressure switch closed, which turns on
the red LED indicator on the switch.When the park brake is
released, pressure buildup opens the switch, which turns off
the indicator.
Maintenance
Removal
1. Tag and disconnect the electrical connector from the
valve.
2. Tag and disconnect the hydraulic lines attached to the
valve. Cap or plug lines and ports.
3. Remove the capscrews, nuts and washers securing the
valve to the frame. Remove the valve.
Installation
1. Secure the valve to the frame and secure with the
washers, nuts and capscrews. Torque the capscrews
Torque the capscrews 10.4 to 12.2 Nm (7.7 to 9.0 foot-
pounds).
2. Connect the hydraulic lines to the valve as tagged during
removal.
3. Connect the electrical connector to the valve as tagged
during removal.
4. Apply and release the park brake several times. Verify
the park brake holds the crane when applied. Verify the
park brake doesn’t drag when released.
5. Check for leaks. Make repairs as needed.
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