A hydraulic driving vehicle comprises front and rear transaxles
incorporating respective hydraulic motors, and a pump unit separated from
the front and rear transaxles. The pump unit incorporates a hydraulic
pump having a pump shaft. A hydraulic circuit is formed by piping between
the pump unit and the front and rear transaxles so as to circulate
hydraulic fluid between the hydraulic pump and the hydraulic motors. A
reservoir tank of the hydraulic fluid is connected to the hydraulic
circuit by piping. A first cooling fan blowing air away from the pump
unit and a second cooling fan blowing air toward the pump unit are
disposed oppositely to each other with respect to the pump unit and
drivingly connected to the pump shaft. At least a pipe for the piping of
the hydraulic circuit and the reservoir tank passes an area blown by each
of the first and second cooling fans.