Caterpillar Inc.

Kenneth Alan Dust

Dayao Chen

Daniel T Mather

Michael Thomas Jackson

Daniel Harry Killion

John Ferraz, Jr

Troy A Shawgo

Deepak Amaravadi

Matthew Hempel

Ryan M Ludwig

Alfred J Abraham

Michael E Nesbitt

Vishnu Irigireddy

An electro-hydraulic arrangement for controlling operation of a pair of tilt actuators of an earthmoving machine includes a housing, and a directional control valve (DCV) and a regeneration valve (RV) disposed within the housing. The DCV and the RV are coupled in selective fluid communication with one another and with rod end and head end chambers of the actuators via ports defined on the housing. When the DCV is in a first or second operative position, the RV may be positioned in a regenerative position to allow the rod end chambers of respective ones of the first and second actuators to communicate fluid to the head end chamber of the second actuator. Optionally, the regeneration valve may be positioned in a drain position to allow the rod end chambers of respective ones of the first and second actuators to communicate fluid with a drain port of the housing.

Electro-hydraulic arrangement for an earthmoving machine

A hydraulic system having an actuator having a piston and associated rod forming head and rod chambers and being adapted to move between retracted and extended positions within a cylinder, and first and second sources of fluid. A first pump provides fluid from the first source to the head chamber at a first pressure. At least one valve provides fluid from the second source at a second pressure to supplement fluid provided to the head chamber from the first pump when the second pressure is greater than the first pressure.

Method and arrangement for active make-up in an overrunning actuator

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Downers Grove, IL, United States of America

Kenneth Alan Dust