2-38 Published 08-25-09, Control # 077-04
HYDRAULIC SYSTEM RT9130E 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 1723.6 kPa/17.2 bar (250 psi), cab hydraulic remote
controllers (HRCs), telescope two stage relief 2757.9 kPa/
27.5 bar (400 psi), telescope hose reel motor 8273.7 kPa/
82.7 bar (1200 psi) and hose reel brake 8273.7 kPa/82.7 bar
(1200 psi). An inlet port contains a 100 mesh screen protects
large contaminates from damaging the cab 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.
Function Check - Swing Brake Release
Valve
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 power brake valve 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.
Function Check - Crane Function Valve
1. Turn off the CRANE FUNCTION switch.
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. Turn on the CRANE FUNCTION switch, put the armrest
down, and set in the seat.
5. 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 all of these functions work.
6. Check for leaks. Make repairs as needed.
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