| 摘要 |
PROBLEM TO BE SOLVED: To easily recover the engine speed when engine speed is lowered by an increase of a traveling load when traveling for working in the traveling speed change structure for working vehicle that the engine power is transmitted to a transmission and a PTO transmission system. SOLUTION: This traveling variable speed structure is provided with an engine speed detecting means for detecting the engine 1 speed, an automatic speed reducing means for automatically operating traveling transmissions 10 and 11 to a low speed side when the engine 1 speed becomes lower than the first set engine speed, and an automatic speed increasing means for automatically operating the traveling transmissions 10 and 11 to a high speed side when the engine 1 speed lower than the first set engine speed rises and exceeds the second set engine speed.
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