Principles of Hydraulics and System Design Criteria

• Hydraulic Pumps
  • Gear Pumps
  • Where are the critical clearances measured?
• Vane Pumps

• What upper operating pressure are vane pumps normally limited to.
• What type of wear pattern will develop on the cam ring when the pump is subjected to aeration or cavitation over an extended period of time?

• Piston Pumps

• What part normally is the first to show signs of wear?
• Can some of these pumps operate at pressure >5,000 psi without using an anti-wear hydraulic oil?

• What factors can cause aeration?
• What factors can cause cavitation?
• When dirt as, a form of contamination, is present in hydraulic fluid, what evidence can be physically seen in a disassembled pump?

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