This is a rare old machine, and I have a problem that I one seems to have seen before. Maybe someone has run into this. I hope you can help me with this. About a month ago we had an IT40B that had the transmission seized in forward. It would shift into reverse, but stall the engine if you let out on the clutch. Turns out that the F gear on the main shaft, which spin on some type of collar "bearing" had heated up and bound to the shaft, bearing and gear. This shaft is at the top of the transmission and even though there was plenty of gear oil, it had water in it from a failed shift boot. Thinking the contaminated oil caused the failure, we bead blasted the parts after getting them apart, polished- honed and reassembled. The truck ran less than two hours and had the same failure again. Now I'm wondering:
*What really caused the first failure.
*How do I avoid another repeat??
Any ideas ?
Clark IT50B
SN: IT355-25-3355 (8/76)