The current of a loaded particle along a two-dimensional (2D) tube with non-straight midline and is investigated. It is found that in the case of a load with an asymmetric unbiased external force, the limits of temperature and asymmetric external force for particle directed moving become smaller as the load increased. The directed current is a peaked function of temperature and amplitude of the asymmetric unbiased external force. As the channel width is decreased, the directed current decreases with the increase of the load. (C) 2016 Elsevier B.V. All rights reserved.