This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Hydraulic Excavator Control System
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1972 by SAE International in United States
Annotation ability available
The use of a low-pressure, low-volume pneumatic pilot system and amplifiers provides superior control of the dipper and dipper arm of a hydraulic hoe when used in conjunction with pressure-compensated four-way hydraulic valves. The use of a split-control regulator and pilot valve provides automatic proportioning of flow for simultaneous operation of a tilt with extend or dig functions. Since the position of the control lever represents a given flow, regardless of the hydraulic load, an operator can positively proportion the speed of the dipper and dipper arm cylinders.