Reverser on a 7700 combine?

The complete drive on the left hand side is different. I am not saying you could not do anything but it would be a lot of work and rigging to make the switch. With the advent of Roundup ready soybeans I bet that I do not use the reverser once each season anymore.

And easier solution to you wanting a reverse would be one of the electric reverser kits that several companies offered for the 00 series combines. They basically put a small flywheel on the right had side of the feeder house. Then they mounted a starter motor so it would engage the flywheel and turn the back shaft backwards. It was basically another short jack shaft in the feeder house chain drive on the right side. This allowed the flywheel to be large enough for the starter motors to have enough torque to work. This worked and would be much simplifier to make/do.
 
Cousin used his reverser in round up ready beans. When we stopped cultivating we stopped picking up rocks. The combine found them once in a while :)
 

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