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Missouri | The case drain line from each motor must be returned to the same source that it came from, otherwise oil can move between the PTO pump reservoir and the tractor reservoir, emptying one, and overfilling the other. If you plumb the ASD to the PTO pump, then the case drain for the ASD also needs to go to the PTO pump.
I would not plug a case drain line into a bypass on the tractor. It needs to be plugged into a proper case drain port. Also known as a sump drain, or a zero pressure return.
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