| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem wherein, pressure resides in cylinders even after finishing the output of tread control of a vehicle until the next tread control, and then residing pressure in hydraulic cylinders is higher with the elapse of time and thus affects pipes being communicated therewith to cause a damage. SOLUTION: This working vehicle comprises the hydraulic cylinders 3, 3 for controlling the change of the treads of right and left wheels 2, 2 journaled onto the vehicle 1. The hydraulic cylinders 3, 3 are constructed to operate the change of the treads with operating oil fed from hydraulic valves 4, 4 to be operated in accordance with a control signal. The hydraulic valves 4, 4 supplies the operating oil to the hydraulic cylinders 3, 3 to output the change of the treads as intended and then also to output the change of the treads in the opposite direction during a set time T. COPYRIGHT: (C)2009,JPO&INPIT
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