8-22 Published 11-22-2016, Control # 345-12
UNDERCARRIAGE RT9130E-2 SERVICE MANUAL
7. Apply hydraulic pressure to the brake.
8. With plug removed, loosen coupling nut and set running
clearance 0.020 - 0.030 in total by adjusting the socket
setscrew. Tighten the coupling nut while holding the
socket setscrew in position.
9. Replace plug.
10. Even up the running clearance of the pads 0.010 to
0.015 in (0.254 to 0.381 mm) each side by adjusting the
socket head capscrew.
11. Readjust the brake when running clearance reaches a
total of 0.100 in (2.54 mm).
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.
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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