Manitowoc Grove RT540E Service Maintenance Manual

Published 4-20-2015, Control # 502-01 8-15
RT540E SERVICE MANUAL UNDERCARRIAGE
8
GROVE
REAR AXLE OSCILLATION LOCKOUT
SYSTEM
Description
The rear axle oscillation system consists of two lockout
cylinders, an axle lockout valve, an axle oscillation relay and
an area potentiometer. The lockout cylinders are mounted
between a cradle (fifth wheel) and the carrier frame. The axle
oscillation lockout valve is located on the left inner center
frame rail and hydraulically controls the lockout cylinders.
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 relay’s contacts are 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 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.
NOTE: For further information on the lockout valve, refer to
Section 2 - HYDRAULIC and PRESSURE
SETTINGS.
Axle Oscillation Lockout Cylinders
Description
A 12.7 cm (5 inch) diameter bore lockout cylinder is installed
on the left and right side of the rear axle. 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.
Maintenance
NOTE: For disassembly and assembly procedures, refer
to Axle Oscillation Lockout Cylinder in Section 2 -
HYDRAULIC and PRESSURE SETTINGS.
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.
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. Tap 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. Tap out the retaining pin and remove the cylinder.
Installation
1. Position the barrel end of the cylinder in the frame attach
fitting and tap 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 tap in 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 in accordance with the procedure in Wheel
And Tire Assemblies in this section.
7. Lubricate both ends of the cylinder using the fittings
provided.
Reference Only

Manitowoc Grove RT540E Specifications

General

Brand	Manitowoc
Model	Grove RT540E
Category	Construction Equipment
Language	English