Grove Published 11-22-2016, Control # 345-12 8-11
RT9130E-2 SERVICE MANUAL UNDERCARRIAGE
Axle Oscillation Lockout Cylinders
Description
Two 7.0 in (17.8 cm) hydraulic lockout cylinders are installed
on the rear axle, one left side and one right side. The barrel
end of each cylinder is attached to each side of the carrier
frame and the rod ends are attached to each side of the
cradle (fifth wheel).
The lockout cylinders are connected hydraulically so that
hydraulic oil flows from the rod side of the left cylinder to the
barrel side of the right cylinder and from the rod side of the
right cylinder to the barrel side of the left cylinder.
Each cylinder weighs approximately 192 lb (87 kg).
Maintenance
NOTE: For disassembly and assembly procedures, refer
to Axle Oscillation Lockout Cylinder, page 2-80.
Removal
1. Raise the crane up on outriggers.
2. Rotate the turntable more than 6 degrees in either
direction from directly over the front to lock out the
oscillation cylinders.
3. Remove the wheel and tire assembly from the axle.
Refer to Wheels and Tires, page 8-4 in this section.
4. Tag and disconnect both hydraulic hoses from the ports
on the cylinder. Cap or plug both hoses and the ports on
the cylinder.
5. At the rod end of the cylinder, remove one of the cotter
pins securing the retaining pin to the cradle attach fitting.
6. Remove out the retaining pin, freeing the rod end from
the cradle.
7. At the barrel end of the cylinder, remove one of the cotter
pins securing the retaining pin to the frame attach fitting.
8. Remove out the retaining pin and remove the cylinder.
Installation
1. Position the barrel end of the cylinder in the frame attach
fitting and install in the retaining pin.
2. Secure the retaining pin with the cotter pin.
3. Align the rod end of the cylinder in the cradle attach
fitting and install the retaining pin.
4. Secure the retaining pin with the cotter pin.
5. Remove the caps or plugs from the two hydraulic hoses
and the cylinder ports and connect the hoses to the
appropriate cylinder ports as tagged during removal.
6. Install the wheel and tire assembly on the axle. Tighten
the lug nuts using the procedure under Wheels and
Tires, page 8-4.
7. Lubricate both ends of the cylinder using the fittings
provided.
8. Function test the axle oscillation system. Refer to
Section 3 - Operating Controls and Procedures in the
Operator’s Manual.
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 consists of a valve body and two solenoid
valves, which keep the lockout cylinders from oscillating
unless the superstructure is within 6 degrees left or right of
directly over the front. The lockout valve is located on the left
side of the frame in front of the front rear axle cross member.
When the superstructure is within 6 degrees left or right of
directly over the front, the area definition potentiometer
energizes the axle oscillation relay which energizes the
solenoids on the axle oscillation lockout valve. This allows
hydraulic oil to flow in and out of the lockout cylinders,
allowing the axle to oscillate.
When the superstructure is more than 6 degrees left or right
of directly over the front, the area definition potentiometer
deenergizes the axle oscillation relay which deenergizes the
solenoids on the axle oscillation lockout valve. This keeps
the axle from oscillating because hydraulic oil cannot leave
the cylinders.
Maintenance
Removal
1. Tag and disconnect the electrical connector to the valve.
2. Tag and disconnect the hydraulic hoses from the valve.
Cap or plug the lines and ports.
3. Remove the two capscrews, nuts and washers securing
the valve to the carrier frame.
Installation
1. Secure the valve to the carrier frame using two
capscrews, washers and nuts. Tighten the capscrews.
2. Connect the hydraulic hoses to the applicable valve
ports as tagged during removal.
3. Connect the electrical connector to the valve as tagged
during removal.
4. Function test the axle oscillation system. Refer to
Section 3 - Operating Controls And Procedures in the
Operator’s Manual.
5. Check the valve and hoses for signs of leakage. Tighten
fittings as required.
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