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Heavy Duty Truck Parts

Helpful Hydraulic Equipment Formulas

PTO OUTPUT SPEED - ENGINE SPEED
  • PTO SPEED = ENGINE SPEED X PTO %
  • PTO % = PTO SPEED / ENGINE SPEED
HP - SPEED - TORQUE
  • TORQUE = HP X 5252 / RPM
  • HP = TORQUE X RPM / 5252
  • RPM = HP X 5252 / TORQUE
GPM - PSI - HP
  • HP = GPM X PSI /1714
PUMP SELECTION - OUTPUT FLOW
  • PUMP FLOW = (DISPLACEMENT X PUMP SHAFT SPEED X EFFICIENCY) / 231
  • PUMP SIZE = (PUMP FLOW X 231) / (PUMP SHAFT SPEED X EFFICIENCY)
  • 231 = cu. inches / gallon
  • FLOW = SPEED
  • PRESSURE = FORCE