this is a deere 250 drive motor which i believe was rebuilt 800 hours ago. it failed once; some bolts backed out 2 broken off flush and some still very tight. i replaced seals and broken bolts reassembled it and it didn't last long at all, as seen in the pic. stuck a different used motor on and its working ok so far. just think it's wierd that it would come apart this way.
Hmmm, I had a drive motor fail similar to this once, but it never repeated, same thing though 2 broke off bolts, and a few backing out, some tight as hell. Never did figure out the cause. Curious with ya. :drinkup
Wonder if that's a vibration issue?
….the Jd 8875 I had also had a drive motor problem …… it was a 2spd ….. I was traveling between plow sites in hi-gear when the motor seized up (but only for a min) It caused the machine to do a Donut in the middle of the road …. I backed up a few feet and everything seemed to be OK ….. a Hyd oil leak showed up shortly after that (5 gal in 8hrs)….. by this time I was so pissed at the machine for all of the other issues accumulated so I traded it off on the Bobcat that I still have today …. The dealer took it in "as is where is" ….. they too figured it was only a leak …… long and short of it was the Drive Motor had broken bolts AND a split case !!!
still curious.... vibration seems plausible. could worn rollers or star within the motor cause it to vibrate itself?
With the 2 drive motors I have had fail this way, all the rollers and internals seemed in good repair. I to was/am under the assumption that it was do to vibration of poor quality bolts maybe? I seem to find this more relevant more and more as parts are from over seas 85% of the time and they just are not made like they use to. On an unrelated topic I suppose whenever I need a hose for a machine they never stock them, so I go and have them made no problem, but they just don't seem to last... Idk why they just don't...
Well, could be vibration, bolts that are damaged or below spec, overorqued. Any type of thread locker/ sealant used on the bolts? I'd wonder if a big hyd shop would have something to put that motor in and run test it, maybe something is misaligned?