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MN | Pretty cool, I've been building a shift controller for our old Steiger that we installed an allison automatic in. The shift handle Steiger used is about $600, and took up a lot of space. The pictures are of the uninstalled controller. We're mounting it on the armrest. I'm using an arduino microcontroller and a pololu motor driver to run the actuator.
The upper toggle is a lift up style that will lock in forward, neutral and reverse, the same style toggle as the header and separator control in the John Deere combines. The lower rocker switch changes gears when you're in forward. The allison automatic has only 1 reverse.
The lights on the left side of the box show the gear you've requested. If you start the tractor with the top toggle selected in forward or reverse it will flash all the lights and won't go into forward or reverse until you've put it in neutral.
The box controls a linear actuator on the transmission that does the shifting. The transmission is still the old mechanical shift automatic.
The pictures show it in neutral, and 4th.
If you wanted to you could probably make something similar to control the twin disc. Could program it to minimize the "open/neutral" spots when you're shifting, and would be able to program it to shift through the gears automatically. It'd be kind of a fun project.
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 IMG00112.jpg (25KB - 719 downloads)
IMG00113.jpg (27KB - 732 downloads)
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For Case 4994 owners, "Twin Disc" transmission controller solutions
