FUNDAMENTALS OF MOBILE EQUIPMENT HYDRAULICS
Fundamental Hydraulics Principles -
Pressure drop and pumping principles - effects/causes of cavitation & aeration.
Dynamics of linear actuators – effects of leakage, variable return flow.
Fluid conductors, sizing, variables, maximum fluid velocities.
Pumps – theory of operation, specifications, fixed/variable.
• Gear pumps
• Vane pumps
• Piston pumps
Pressure controls – theory of operation, construction, adjustment, application.
• Relief, backpressure
• Principles of flow – size, pressure drop, viscosity/temperature
• Meter-in circuits
• Meter-out circuits
• Bleed-off circuits
• Pressure compensation
• Check, Spool valves
• Theory of operation, options, application
• Typical construction, options, operation of hydraulic cylinders and motors
• Effects of cushions, leakage, displacement, velocity, and flow changes
• Force/torque development