Discussion
Arrange the causal chain by which overloading a thresher raises losses:
1. Feed rate is increased beyond capacity
2. The mat through the cylinder and over the walkers thickens
3. Grain cannot reach the concave or shake free of the straw
4. Unthreshed and separation losses both rise
Select the correct sequence.
Answer: A
Correct answer: 1, 2, 3, 4
The chain runs from the operator's decision to the measured loss. Feed rate is increased beyond the machine's capacity (1), and the mat passing through the cylinder and over the walkers thickens (2).
A thick mat is the problem: grain in the middle of it cannot reach the concave to fall through, and cannot shake free of the straw on the walkers (3). Unthreshed loss and separation loss therefore both rise (4) - which is why pushing a thresher for output so often reduces the grain actually recovered.
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