| 摘要 |
PROBLEM TO BE SOLVED: To solve problems wherein change of a bolt type crawler adjust requires much cost and is difficult in amounting structure when abnormal tension is generated in a crawler by irregularity of the ground and the bolt type crawler adjust as a special component is broken. SOLUTION: An idler fork 30 engaging with a truck frame 11 and front driven wheels 12 are integrally fixed movably in the longitudinal direction, a collar 33 is fixed to the idler fork 30 via a support member 31, the bolt type crawler adjust 32 is disposed in parallel with the outside of a front machine of the truck frame 11, the tip of the bolt type crawler adjust 32 is engaged with the collar 33, and the tension of the crawler 14 is adjusted by the feeding movement of the bolt type crawler adjust 32. The collar 33 is structured to break when the abnormal tension occurs in the crawler 14.
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