PROBLEM TO BE SOLVED: To resolve a problem of making a complicated configuration caused by necessity of arranging an engine cooling fan and a dust-proof fan.SOLUTION: This invention relates to a mover part structure for a work vehicle constituted in such a way that a radiator 13 is installed outside an engine 11, a dust-proof filter 15 is installed outside the radiator 13, a fan 12 is installed between the radiator 13 and the engine 11, a drive rotating direction of the fan 12 can be freely changed over to an inverse rotating direction against a normal rotating direction by a transmission mechanism K, and the transmission mechanism K is provided with a normal rotation transmitting path S for transmitting a normal rotation for blowing air from an external part of the machine body into the machine to a first input pulley 28 arranged at a rotating shaft 27 of the fan 12, and a second input pulley 34 arranged at the rotating shaft 27 is provided with an inverse rotation transmitting path G for transmitting an inv
