Surplus Center

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