Productivity and Costs of the Timberjack 30 Feller Buncher

Time and production studies were conducted on the Timberjack 30 Feller Buncher row thinning in pine plantation and natural stands. Factors such as tree size, load size, stand density, and brush were examined for influence on production rates. Only diameter at breast height and trees per acre significantly affected the productive time to fell and bunch trees. Cutting methods — row only, selection from both sides, and selection from one side– were compared. Cutting only the row was more productive than either of the side selection methods, but the increase did not make multiple passes more productive than a single pass where both row and selective trees were cut. In one test stand, felling and bunching costs averaged $10.43 per cunit. A qualitative evaluation of the Timberjack 30 was also included.

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