| 摘要 |
A tractor has a frame which rides on four separate track assemblies. Each of the forward pair of these track assemblies is capable of a degree of upward and downward movement relative to the other and to the frame, so that contact between each of these track assemblies and the ground is maintained as the tractor is driven over relatively rough terrain. Ground forces acting on the forward track assemblies are substantially equalized between such forward track assemblies by equalizer bar apparatus.
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