| 摘要 |
PROBLEM TO BE SOLVED: To carry out a fine course correction for making along a field grain stem line and a direction change in a field headland by a steering wheel operation, thereby improving a steering function and a driving operability. SOLUTION: This combine comprises a continuously variable transmission mechanism 25 variably transmitting a driving force of an engine 21 to a right and left traveling crawlers by a traveling shift operation of a gear shift lever, and a steering hydraulic motor 27 generating a difference in a driving speed of the right and left traveling crawlers by an operation of a steering wheel. A traveling speed is reduced in accordance with a manipulated variable of the steering wheel, and a speed difference between the right and left travelling crawlers is continuously changed to shift to a spin turn operation. The steering wheel is formed into a round shape which performs turning operation and a right or a left turning operation range of the steering wheel is within a turning angle of about 135 degrees, and a range of harvesting work course correction aligning lines is within a turning angle of about 15 degrees.
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