| 摘要 |
Track sub-assembly having a castering swing link for supporting a primary idler spindle, the swing link having an upper bore for accepting a first connecting pin and a lower bore for accepting a second connecting pin to define a pivot line, and an offset idler bore offset from the pivot line permitting castering of the primary idler in response to externally imposed force vectors, with self-alignment of the primary idler to its proper tracking position.
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