Pumps & Motors

  • Pumping = 1 Hp = 1 GPM x 1500 Psi
    (linear relationship i.e. 2 GPM @ 1500 Psi = 2 Hp)

  • Hp to drive hydraulic pump = Psi x GPM / 1714

  • Efficiency - typically assume hydraulic pump/motor efficiency of 85%

  • Hydraulic motor torque (in-lb) = Pressure (Psi) x motor displacement (in3/rev) / (2 x Pi)

  • Hydraulic motor speed (RPM) = 231 x GPM / motor displacement (in3/rev)

  • Hydraulic motor power (Hp) = Torque (in-lb) x RPM / 63025
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