| 摘要 |
PROBLEM TO BE SOLVED: To prevent removal of a crawler. SOLUTION: Crawler guide bodies are detachably mounted on front and rear ends of an oscillating body, positioned between a right and left pair of rolling wheels and the guide bodies are formed on a lower end edge part of the crawler guide bodies to arrange the guide bodies between many protruded pairs right and left crawler removement preventing pieces with circumferential intervals in the center part of the inner circumferential face of the crawler.
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