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Reading Hydraulic Schematics

Reading Hydraulic Schematics. Lecture 9. Purpose of Hydraulic Schematics. Schematics are drawings that you can use to see how a system is put together Schematics can be used to locate where a component is located Useful for troubleshooting. Pumps. Uses a circle with an arrow pointing out

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Reading Hydraulic Schematics

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  1. Reading Hydraulic Schematics Lecture 9

  2. Purpose of Hydraulic Schematics • Schematics are drawings that you can use to see how a system is put together • Schematics can be used to locate where a component is located • Useful for troubleshooting

  3. Pumps • Uses a circle with an arrow pointing out • Denotes fixed displacement • Variable displacement has a diagonal line going through it

  4. Motors • Similar to a pump, except the arrow is pointing in • If it has 2 arrows, it is bidirectional • A diagonal arrow means it is variable displacement

  5. Pressure Relief Valves • The dashed line indicates internal passages • Can have a spring, or can be pressure operated (sequence valve) • Pilot operated can be marked with a P

  6. Cylinders • Can be single or double acting • Single acting have only one port

  7. Control Valves • Can be tandem (allows flow to tank when closed • Can be closed center (allows no flow in the system)

  8. Control Valves • Can be open center (allows flow on both sides of the valve) • 4 way valves control double acting cylinders • 3 way valves control single acting cylinders

  9. Filters and Coolers • Filters are shown by a diagonal box with a dotted line through it • Oil Coolers are similar except that the line is solid

  10. Oil Reservoir Tanks • Usually one line into it, but can be several • Can be several tank symbols in one drawing, but only one common tank

  11. Gauges • Oil temperature gauges • Oil pressure gauges

  12. Hydraulic Check Valves • Can use a ball and seat or a spring behind the ball

  13. Hydrostatic Transmissions • Usually a variable pump and a motor coupled together • Can use a variable motor also

  14. Other Symbols • Other symbols are used by certain manufacturers • Usually marked or have a legend describing part • Most schematics do not place parts where they actually are on the machine • Must use other manuals to locate parts

  15. Websites and Resources • http://www.hydraulicsupermarket.com • http://www.parker.com • Vickers Mobile Hydraulics Manual • Parker Industrial Hydraulics

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