| 摘要 |
PROBLEM TO BE SOLVED: To dispense with an exclusive oil cooler for cooling a traveling transmission case and to cool the traveling transmission case by an input pulley to which the motive power is inputted. SOLUTION: The input pulley 7 for inputting the motive power to the traveling transmission case 5 for rotating and driving a left and right pair of traveling crawlers on the lower side of a traveling chassis, is provided with plural fins 8 for generating the cooling air for cooling the traveling transmission case 5, and a guide cover 9 is mounted for guiding the generated air. A lower face of the traveling transmission case 5 is located at an upper part with respect to a center of a traveling axle, and an axle sprocket divided into three, that is, a sprocket part and inner and outer bosses, and integrally connected by means of bolts is journaled to the traveling axle.
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