USVeteran
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Looking for some help troubleshooting a shifting problem on my Caterpillar 621E scraper. The machine is a 6AB806, and it has a reman transmission (0R4025), but it will not shift correctly unless I move it into 6th gear first. We've already done some testing, and I'm trying to figure out if we're missing something electrical, hydraulic, or inside the transmission control system itself.