They are the worst thing that John Deere has ever put together!
Be carefull in canolla, the seeds can slip past the plunger, and end up behind it, effectively blocking the plungers path, which again will destroy a 2 dollar thrust bearing on the bottom of the threaded bar that moves the plunger. If that bearing gets messed up the motor goes, and its just a world of pain from there. Drilling a couple of holes in the housing wont help this problem since the tank will get full at some stage, and it wont have anywhere to go.
We have pulled those things apart so many times that its not even funny, and im not really sure why we got them anymore since they seem to become inaccurate after a couple of days of harvesting. And you will have to run in samples anyway.
they also become inaccurate when the temperature drops at night, pushing the moisture through the roof on screen, without the grain even being wet. Take a sample of the last box you make one night and send it in with a truck to get it tested and see how far of your meter are. Its scary.
I even heard rumors about if you turn the lights on, on a 9760 the moisture meter wil start reading wrong instantly
but i cant say i got any evidence of that