2-40 Published 11-22-2016, Control # 345-12
HYDRAULIC SYSTEM RT9130E-2 SERVICE MANUAL
PRESSURE REDUCING SEQUENCE VALVE
WITH SOLENOID CONTROLS MANIFOLD
Description
The pressure reducing sequence with solenoid controls
manifold Figure 2-22 is located on the outside of the
superstructure right hand side plate. It is used to control a
regulated pressure and flow of hydraulic oil to the swing
brake 250 psi (1723.6 kPa), cab hydraulic remote controllers
(HRCs), telescope two stage relief 400 psi (2757.9 kPa),
telescope hose reel motor 1200 psi (8273.7 kPa) and hose
reel brake 1200 psi (8273.7 kPa). An inlet port contains a 100
mesh screen to prevent large contaminates from damaging
the cab hydraulic remote controllers (HRCs).
The swing brake, HRCs, and hose reel motor are controlled
by a two position three way normally open to tank solenoid
valve. When energized, pressurized oil is allowed to flow to
the respective functions.
The two position three way swing brake release solenoid
valve serves as the swing brake release. When de-
energized and the Swing Brake switch is ON, the springs in
the swing brake push oil to the tank allowing each brake to
engage. When the Swing Brake switch is OFF, pressurized
oil is directed to the swing brakes, releasing them.
The HRC two position three way solenoid valve serves as
the controller armrest lockout valve. When the Crane
Function switch is OFF, or the armrest is raised, the valve is
de-energized which prevents pressurized oil from reaching
the HRC’s. When the Crane Function switch is ON,
pressurized oil is directed to the HRC’s allowing crane
operation. This valve, when de-energized, prevents
accidental turntable, hoist, or boom movement.
Maintenance
Removal
1. Tag and disconnect the electrical connectors to the
swing brake and armrest lockout valve.
2. Tag and disconnect the hydraulic lines from the valve.
Cap or plug the lines and ports.
3. Remove the capscrews, lockwashers and flatwashers
securing the valve. Remove the valve and two spacer
bushings.
Installation
1. Position the valve and spacer bushings on the turntable
and secure it with the capscrews, flatwashers and
lockwashers.
2. Connect the hydraulic lines to the valve as tagged during
removal.
3. Connect the electrical connectors to the valve as tagged
during removal.
Swing Brake Release Valve-Function Check
1. Position the Swing Brake switch to OFF. Verify the LED
in the switch goes out.
2. Swing the turntable to verify the swing brake has
released. Step on the swing brake pedal to stop the
turntable.
3. Position the Swing Brake switch to ON. Verify the LED in
the switch comes on.
4. Activate swing and ensure the turntable will not rotate,
indicating the swing brake is on.
5. Check for leaks. Make repairs as needed.
Crane Function Valve-Function Check
1. Position the Crane Function switch to OFF.
2. Start the engine.
3. Try to telescope the boom in and out, lower and raise the
boom, hoist each hoist up and down, and swing the
turntable left and right. Verify none of these functions
work.
4. Position the Crane Function switch to ON, put the
armrest down, and sit in the seat.
5. Telescope the boom in and out, lower and raise the
boom, operate each hoist up and down, and swing the
turntable left and right. Verify all of these functions work.
6. Check for leaks. Make repairs as needed.
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