There are several factors that need to be known before a calculation can be used to decide the most suitable sized hydraulic gear motor for an application.
1) First of all find out if the required output torque from the hydraulic motor is starting torque or running torque. Not that either will effect the way you size the hydraulic gear motor, but it is worth remembering that starting torque is, in most instances, higher than running torque.
2) Required output speed from the hydraulic motor.
3) Available hydraulic oil pressure of the application hydraulic circuit.
4) Required output shaft, required mounting interface and required inlet and outlet porting, flanged or threaded.
5) Don’t forget the coupling from the hydraulic motor shaft to the driven shaft. jbj Techniques have a wide range of mechanical power transmission couplings to suit many applications. We would be happy to help.
Further information found at https://www.jbj.co.uk/gear-motors.html
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