I'd have to wonder why the valve is failing? Is it the force motor that's failing? There has to be an underlying inherent reason. It's just a machine... something is wrong. If the motor is crapping out I'd wonder about the electrical supply to it. The wiring may not be robust enough and the motor is drawing more current than it should and frying it's windings. You could also have a problem with the bulkhead power supply under the cab as those things were well known for that... or a bad ignition load relay... or an alternator that's got problems and isn't making steady voltage. I had a couple of solenoids take a dump on my 7710 a few years ago, blowing lights, etc. It seemed to stop when I changed the alt... There's something funny going on. Somebody just needs to find out what... I'm sure you could install the top link sensing lift cover and all of it's ancillaries but that will also cost you a good dime if you can find one and rebuild it... and it's not the hottest system in the world either... particularly the 7710's variety with the load monitor. That part you would also need to leave disconnected because you don't have the ball ramp in the lower driveline.
I'm really not familiar with the EDC on that tractor... but if I was seeing motor/electrical failures of a $2K valve I'd probably not waste too much time in hooking a heavy relay power supply close to the motor/valve and use the control system to control the cube relay.
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