UNDERCARRIAGE GRT8100 SERVICE MANUAL
8-12
Published 3/26/2018, Control # 596-05
Axle Oscillation Lockout Cylinders
Description
Two hydraulic lockout cylinders are installed on the rear axle,
one left side and one right side. The base 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 38.8 kg (85.5 lb).
Removal
1. Raise the crane up on outriggers.
2. Rotate the turntable more than 3° 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. Refer to Wheels And Tires, page 8-4.
7. Lubricate both ends of the cylinder using the fittings
provided.
8. Function test the axle oscillation system in accordance
with the Operator’s Manual to ensure proper operation.
Axle Oscillation Lockout Valve
Description
The axle oscillation lockout valve (also called the double
solenoid valve), located on the carrier combination manifold
valve, is used in the rear axle oscillation lockout circuit. The
valve is mounted on the left rear face of the carrier frame rear
cross member 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.
For the CE Units with Dual Axis Controllers, the axle
oscillating lockout valve is replaced with four two way
solenoid operated poppet cartridge valves installed in the
ports of the lockout cylinders.
The angle encoder located in the top of the electrical slip ring
assembly sends a CAN bus message to the RCL. The RCL
converts the data in the message to a position angle of the
superstructure relative to the carrier (slew angle). If the slew
angle is ±3° of directly over the front, the RCL sends a CAN
bus message to the Crane Control System to allow axle
oscillation. When the Crane Control System receives this
message it switches ON a digital output thus energizing the
axle oscillation solenoids. If the angle is more than 3° left or
3° right of directly over the front, the Crane Control System
switches OFF the digital output thus de-energizing the axle
oscillation solenoids.
When the axle oscillation normally closed solenoid valves
are de-energized the lockout cylinders are isolated 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 solenoid valves are energized and
open, hydraulic oil is allowed in and out of the cylinders,
allowing them to oscillate.
BRAKE SYSTEM
Description
The brake system includes all the components necessary for
the application of the service brakes and the parking brake.
Service Brakes
The service brakes are full power hydraulic brakes which are
hydraulically controlled and are used to apply the brake
assemblies on all four wheels. The system consists of the
tandem brake valve with treadle pedal, the dual accumulator
charge valve, two hydraulic accumulators, the brake
assemblies, and all the associated hoses and tubing. The
operator depresses the pedal on the tandem brake valve,
located on the cab floor, and the valve modulates the brake
line pressure to the brake assemblies at each wheel. The full
To Next Page
Loading...
Need help?
General
