Grove Published 11-22-2016, Control # 345-12 2-61
RT9130E-2 SERVICE MANUAL HYDRAULIC SYSTEM
AXLE OSCILLATION LOCKOUT VALVE
Description
The axle oscillation lockout valve (also called the double
solenoid valve) is used in the rear axle oscillation lockout
circuit. The valve is mounted on the right rear face of the
carrier frame forward of the rear axle. 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 de-energized 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 de-
energized.
When the axle oscillation relay’s contacts are open, the
normally closed solenoid valves are de-energized and
isolate the lockout cylinders from hydraulic oil supply. This
keeps the cylinders from oscillating (moving up and down to
damp axle movement) because hydraulic oil cannot leave
the cylinders. Instead, the cylinders remain full of hydraulic
oil and more rigid.
When the axle oscillation relay’s contacts are 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, nuts and washers securing the
valve to the frame bracket. Remove the valve.
Installation
1. Secure the valve to the crane with the capscrews, nuts
and washers.
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. Verify proper operation. Refer to Section 3 in the
Operator’s Manual.
5. Check valve and hoses for leaks. Make repairs as
needed.
RELIEF VALVE
Description
The in-line plumbed direct acting relief valve is installed at
the hydraulic hose reel motor. It is used to protect the motor
in case of a pressure surge.
The valve consists of a manifold and cartridge. When
pressure at the inlet port exceeds the bias spring force or
setting holding the valve closed, the valve will open, directing
pressurized oil to the reservoir.
Maintenance
Removal
1. Tag and disconnect hydraulic lines from the valve. Cap
or plug all openings and remove valve.
Installation
1. Connect the hydraulic lines as tagged during removal.
2. Check valve and hydraulic connections for leaks. Make
repairs as needed.
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