A vibration exciter apparatus includes an exciter housing and at least one bearing means supporting at least one driven shaft carrying eccentric mass means. The exciter housing has an array of bore passages extending from an upper wall of the exciter housing to a lower wall of the exciter housing and a mounting structure plate securable to mineral processing or handling equipment intended to be vibrated by the exciter apparatus. The mounting structure plate includes an array of fastener receiving zones, whereby elongated fastener means can pass through the bore passages from the upper wall to be engaged in the fastener receiving zones.

A rotational coupling including a bearing assembly including a first race rotatably coupled to a second race, wherein the first race is configured to receive a plurality of first fasteners to couple the first race and the bearing assembly to a fluid supply. The rotational coupling also including a connection flange coupled to the second race and configured to receive a plurality of second fasteners to couple the connection flange to the second race. The second race includes a first side facing the connection flange and a second side opposite the first side and facing the first race, wherein the second race includes at least one access aperture configured to enable access to the plurality of first fasteners from the first side to removably couple the bearing assembly to the fluid supply.