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Forestry 1996 69(3):229-244; doi:10.1093/forestry/69.3.229
© 1996 by Institute of Chartered Foresters
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Case studies on farm tractors as base machines for single-grip thinnings harvester heads

J. JOHANSSON

Swedish University of Agricultural Sciences, Department of Operational Efficiency S-776 98 Garpenberg, Sweden

Time and ergonomic studies were carried out for three farm tractor-based single-grip harvesters. The base machines were two models but all attachments varied. One of the machines was also used as forwarder by attaching a wagon and exchanging the harvesting head for a grapple. The studies indicate a productivity at the same level as that of Nordic specialized forest machines (harvesting and forwarding). Ergonomics proved to be fairly good, especially for two of the machines, but still not at the same level as for Nordic specialized forest machines. Mean ground pressure exerted by the farm tractor-based harvesters was at the same level as for some of the Nordic specialized single-grip harvesters which were compared. That was also the case for the highest ground pressure (the highest ground pressure for one wheel with the crane at full length and turned off to the side 90°) The ability of the machines to operate in the terrain was good.

These machines can also be used for other jobs, such as forwarding, and the traditional variety of jobs in agriculture. Thus the machines function more as attachment carriers than custombuilt specialized machines. With a more careful planning of operations, the machines can be used to a high degree and more effectively. The relatively low investment cost in comparison with that of many custom-built specialized machines often contributes to a reduction in operating costs.

Received 24 May 1995.
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