TROUBLESHOOTING MOBILE EQUIPMENT HYDRAULICS

  1. Review of Fundamentals

  • Flow, pressure, horsepower, torque, cylinder speed, cycle time, etc.


  1. Reading Schematics & Graphic Symbols


  1. Understanding System Operation


  1. Recognizing the Need for Cleanliness & Filtration


  • Types & location of filters

  • Cost benefit analysis

  • Micron ratings & the Beta Factor

  • Fluid & seal type compatibility



  1. Understanding Flow in the System

  • Pump wear – effects of contamination, head, and pressure


  • Slow cylinder movement

  • Sizing inlet filters and strainers

  • Erratic cylinder operation

  • Importance of atmospheric pressure



  1. Cavitation – Aeration Problems


  • Inlet restrictions

  • Importance of atmospheric pressure

  • Sizing inlet filters and strainers

  • Pump shaft speeds



  1. Diagnosing Plumbing Problems

  • Correct use of fittings (NPTF, SAE, JIC 37°, straight thread O-ring)


  • Hose sizing and pressure ratings

  • Pipe, tube, and hose application



  1. Troubleshooting Directional Control Valves


  • Pressure loss – manual & solenoid control

  • Solenoid failures

  • Non-pressure loss – manual & solenoid control



  1. Pressure Controls Adjustments


  • Sequence valves

  • Counterbalance valves

  • Unloading valves

  • Pressure reducing valves

  • Pilot operated valves

  • Brake valves



  1. Testing Relieve Valve Settings

  • System pressure & operating pressure


  1. Diagnosing Cylinder & Motor Failures, Use of Flow Meters, Pressure Gauges & IR Sensor Guns

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