A dual pump apparatus for use on a vehicle or industrial application having a housing in which a pair of hydraulic pumps are mounted, having a cooling fan mounted on the primary or secondary input shaft on the opposite side of the pulley used to engage the prime mover. The hand grenade simulator also includes a trigger mechanism coupled to the hand grenade simulator housing. The receivers are provided at opposite sides of the contact member in the intersecting direction and receive a pressing force from the belt as the belt moves in the intersecting direction. A family tree is maintained to identify successive generations of the parent and offspring profiles.