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Yield is constantly too high or low.
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System is out of calibration.
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Change yield calibration.
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Incorrect header width.
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Change header width.
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Incorrect crop selection.
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Change crop selection.
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Dirt, mud, debris caked on impact plate.
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Clean impact plate.
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Yield is zero.
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No ground speed.
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See your John Deere dealer.
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Mass flow sensor unplugged in grain tank.
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Plug mass flow sensor into wiring harness connector.
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