REPLACE OEM, DAN FOSS, EATON, CHARLYNN, MASSEY FERGUSON.WORKS FOR MANY DIFFERENT APPLICATIONS. THIS IS A LOAD SENSING ORBITAL WHICH MEANS IT RUNS ON A VARIABLE PUMP.    Load sensing  is a term used to describe a type of pump control employed in open circuits. It is so called because the load -induced pressure downstream of an orifice is sensed  and pump flow adjusted to maintain a constant pressure drop (and therefore flow) across the orifice.