Abstract
Samples of 28 different potato harvester chain links in seven different configurations were evaluated using the MSU-USDA Instrumented Sphere (IS). During the fall of 1989, 23 potato harvesters in Michigan were evaluated using the IS. Besides the IS impact data, each harvester was measured for chain speed relationships, operating ground speed, chain type and drop height. Testing of the harvesters did provide a range of data that represents what is likely to occur when the IS is used to evaluate individual harvesters. Based on the average peak acceleration and velocity change values (and the computed severity rating), air heads had the most severe impacts. The next most severe impacts were the primary chain, where all impacts were on steel. Next were the transitions to the rear cross and the side elevator, both of which involved a change of direction for the IS and the potatoes. Roller tables had the least severe impacts.
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