Patent ID: 8190342

Claim:
A hydraulic vehicle provided with a running-system hydraulic unit that includes a hydraulic pump being configured to be driven by an engine, a hydraulic motor being configured to be driven by pressure oil discharged from the hydraulic pump, and a pair of running-system oil passages connected between the hydraulic pump and the hydraulic motor for forming a closed circuit, the hydraulic vehicle being configured to be driven by the hydraulic motor for running, the hydraulic vehicle comprises: a backup pump being configured to be driven by the engine; a backup pressure oil supply unit being configured to allow pressure oil discharged from the backup pump to flow to one of the running-system oil passages that is higher in pressure than the other when pressure oil is supplied from the hydraulic pump to the hydraulic motor; and a drain unit being configured to drain pressure oil from the other of the running-system oil passages when the pressure oil is allowed to flow to the one of the running-system oil passages through the backup pressure oil supply unit.