Hydraulic Excavator Control System
720801
02/01/1972
- Event
- Content
- 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.
- Pages
- 4
- Citation
- Bernhoft, G., "Hydraulic Excavator Control System," SAE Technical Paper 720801, 1972, https://doi.org/10.4271/720801.