Patent ID: 11932327
Assignee: CATERPILLAR PAVING PRODUCTS INC.
Field: Transport (Mechanical engineering)
Classification: CPC B  F  E | IPC B  E  F

Claim 8:
9. A method for controlling side-to-side slope of a four-legged construction machine having multiple independent propulsors each mounted to a hydraulic lifting device, the method comprising:
adjusting a height of right and left hydraulic lifting devices of the multiple independent propulsors, the multiple independent propulsors comprising a first propulsor and a second propulsor;
traversing a ground surface having a changing topography with the multiple independent propulsors;
maintaining individual heights of the right and left hydraulic lifting devices in a fluid circuit, the fluid circuit comprising a first fluid line connecting piston-ends of the first and second propulsors and a second fluid line connecting rod-ends of the first and second propulsors; and
activating a relief valve connecting the right and left hydraulic lifting cylinders at the second fluid line to control flow of hydraulic fluid out of one of the right and left hydraulic lifting cylinders and into the other of the right and left hydraulic lifting cylinders to control retraction of one of the right and left hydraulic lifting cylinders.