Yield is constantly too high or low.
System is out of calibration.
Perform a yield calibration.
Incorrect header width.
Change header width.
Incorrect crop selection.
Change crop selection.
Dirt, mud, debris caked on impact plate.
Clean impact plate.
Yield is zero.
No ground speed.
See your John Deere dealer.
Mass flow sensor unplugged in grain tank.
Plug mass flow sensor into wiring harness connector.
AG,OUO1035,1739 -19-07FEB00-1/1