My d5g is spitting out the fan belts. No obvious problems seen. I had another machine doing the same thing one time. Turned out the tensioner would seize momentarily and shred belts. Could the dozer have the same issue?
watglen, that would be where I would start lookin. Case 1845c's would do that and 9 out of 10 it was the belt tensioners. bearing prolly gets hot and seizes, the cools off and frees up
Wat, I know its kinda hard to check but it's possible that your crank balancer is bad if it has one. Had that problem a few years back...re packed the fan bearings, replaced the tensioner checked everything else that was belt driven and it still threw belts. Even went so far as to measure end play on the crank which was not bad at all. Replaced the harmonic balancer and it stopped throwing belts
Put a new belt on and run the machine for a while then remove the belt and look for unusual wear on it.
This was an easy one to fix. Previous owner had installed two different belts, an unmatched pair. The longer one kept jumping off. Install a proper matched pair and the problem is gone.