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On the right hand side on the lower shaft of the feeder house, there is a sensing wheel that has come loose. There is an updated wheel from JD to put on there. This wheel senses if there is any movement before allowing the the reverser to engage. Hopefully you caught it soon enough that there was no damage to the reverser.

just to add a little more here...
when this sensor wheel gets loose as to where the sensor can no longer read it. the combine has a built in 10 second delay before it will change reverser direction. meaning, if your backshaft speed is 0, you will have to hold the switch in the reverse position for 10 seconds before it will do anything.

i have also seen where the solenoid that controls this gets sticky in its bore, but definitly check the other 2 suggestions first.
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