Cost is clearly an enormous factor in any component selection, but initial cost and expected existence are simply one part of the. You must also understand the motor’s efficiency ranking, as this will factor in whether it operates cost-effectively or not. In addition, a component that is easy to restoration and keep maintaining or is easily changed out with various other brands will certainly reduce overall system costs in the end. Finally, consider the motor’s size and weight, as this will effect the size and weight of the machine or machine with which it really is being used.
Hydraulic motors can use different types of fluids, and that means you must know the system’s requirements-does it need a bio-based, environmentally-friendly liquid or fire resistant one, for instance. In addition, contamination can be a problem, so knowing its resistance amounts is important.
You must know the maximum operating pressure, speed, and torque the motor will need to accommodate. Understanding its displacement and stream requirements within something is equally important.
At the medium-pressure and cost range, vane motors feature a housing with an eccentric bore. Vanes rotor slide in and out, run by the eccentric bore. The motion of the pressurized fluid causes an unbalanced power, which in turn forces the rotor to turn in one direction.
Piston-type motors are available in a variety of different designs, including radial-, axial-, and other less common designs. Radial-piston motors feature pistons arranged perpendicularly to the crankshaft’s axis. As the crankshaft rotates, the pistons are shifted linearly by the liquid pressure. Axial-piston hydraulic motors designs feature a quantity of pistons organized in a circular design in the housing (cylinder block, rotor, or barrel). This housing rotates about its axis by a shaft that is aligned with the pumping pistons. Two designs of axial piston motors exist-swashplate and bent 
axis types. Swashplate designs feature the pistons and drive shaft in a parallel arrangement. In the bent axis version, the pistons are arranged at an position to the main drive shaft.
Of the lesser used two designs, roller star motors offer lower friction, higher mechanical effectiveness and higher start-up torque than gerotor designs. In addition, they provide smooth, low-speed operation and provide longer life with less use on the rollers. Gerotors offer continuous fluid-tight sealing throughout their smooth operation.
Specifying hydraulic motors
There are several considerations to consider when selecting a hydraulic motor.