B100T rear end trouble

[denerod]

I bought a B100 turbo loader and backhoe from a fleet dealer with 480 hours on the machine. After about 6 months, it quit moving, wound up being the rear end gears. Rebuilt it myself, pinion and ring gear kit was about 1300.00, a lot for two gears. Now, about 140 hours later, the gears have broken again. I have been careful to accelerate and decelerate slowly so it doesn't jerk and haven't really abused it at all. Is my tractor a lemon, or is this something Bobcats have a weakness for? I can't afford to rebuild it every couple years at 1300.00 a pop, which seems excessive for the two gears and an assortment of shims and bearings.