A roller assembly call up mechanism for a vehicle wash conveyor having an endless chain with a plurality of spaced roller assemblies attached thereto for pushing a vehicle along a slotted track, is located below the track and includes a power cylinder, a crank arm connected to the power cylinder and an axle connected to the crank arm for rotation with the axle. A ramp in the form of a pair of spaced forks is connected to the axle for rotation therewith. A slotted link is pivotally connected at one end to the ramp and at an opposite end to the entrance trap door whereby when the power cylinder is actuated the ramp and the trap door are pivoted upwardly.