HYDRAULIC SYSTEM RT540E SERVICE MANUAL
2-50 Published 4-20-2015, Control # 502-01
AXLE OSCILLATION LOCKOUT VALVE
(STANDARD UNITS)
Description
The axle oscillation lockout valve is used in the rear axle
oscillation lockout circuit. The valve is located on the left
inner center frame rail. It consists of a valve body and two
normally-closed, two way, two position solenoid valves. It
keeps the lockout cylinders from oscillating, unless the
turntable is centered forward.
The area definition potentiometer in the electrical swivel
energizes and deenergizes the axle oscillation relay. When
the superstructure is more than 6 degrees left or right of
directly over the front, the axle oscillation relay is
deenergized.
When the axle oscillation lockout valve is open, the normally
closed solenoid valves are deenergized and isolate the
lockout cylinders from hydraulic oil supply. This keeps the
cylinders from oscillating (moving up and down) because
hydraulic oil cannot leave the cylinders. Instead, the
cylinders remain full of hydraulic oil and rigid.
When the axle oscillation lockout valve is closed, the
solenoid valves are energized and open. This allows
hydraulic oil in and out of the cylinders, allowing them to
oscillate.
Maintenance
Removal
1. Tag and disconnect the electrical connectors to the
valve.
2. Tag and disconnect the hydraulic hoses from the valve.
Cap or plug the lines and ports.
3. Remove the capscrews, hex nuts, flatwashers and
lockwashers securing the valve to the frame. Remove
the valve.
Installation
1. Secure the valve to the crane with the capscrews, hex
nuts, flatwashers and lockwashers. Torque the
capscrews, see Fasteners and Torque Values, page 1-
11.
2. Connect the hydraulic hoses to the ports on the valve as
tagged during removal.
3. Connect the electrical connectors to the valve as tagged
during removal.
4. Check valve and hoses for leaks. Make repairs as
needed.
Reference Only
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