An assembly for adjustably mounting a gear of a pump to a gear of a driver equipment includes a shroud member, and a hollow elongated stub-shaft. The stub-shaft includes a flange, and a hub member axially extending from the flange. The shroud member defines a first aperture whose diameter is greater than a diameter of the hub member. The hub member is received within the shroud member via the first aperture. The flange has a first set of holes to receive a first set of fasteners and releasably couple with the body of the pump. The flange also has a second set of holes that are configured to receive a second set of fasteners and releasably couple with the shroud member. A diameter of the second set of holes is greater than a diameter of the second set of fasteners.