ABSTRACT A pump assembly including a gerotor pump having an inlet and an outlet, and comprising an annulus and a lobed rotor, one, but not both, of the rotor or annulus being split axially into two parts, the pump further comprising indexing means for angularly shifting one part relative to the other part, the inde...

According to the present invention there is provided a hydrostatic drive comprising a gerotor pump supplying hydraulic fluid to a motor, in which the gerotor pump has an annulus (60) and a male lobed rotor (64, 66) engaging one another, characterized in that, the male lobed rotor (64, 66) being axially split into two ...