What is this bearing?

[chatwithtom]

I pulled the magnet plate out of the bottom of the transmission oil sump in my nortrac 35xtd dozer of 62 hours and this is what I found attached to the magnet.
There no indications of bad operation. What is this destroyed bearing? how did it get completely removed from a shaft it was on? the inside of the bearing did not break apart.
This is in what I believe is called the final transmission. the shift gear box forward of this appears ok.

advice is appreciated. if its just related to PTO, then I will just leave it alone. I don't need PTO. I really don't want to break into this gear box.

Thanks, Tom

 

[piper184]

Not sure what that is from, but in my book it would warrant an immediate tear down. That is a lot of debris to have any any gearbox and open bearing system. Probably lots more damage elsewhere.
YMMV

 

[Bob Rooks]

If it was the pinion bearing you'd know it in a heartbeat.
The cross shaft bearing are tapered roller bearings. That leaves only the live PTO shaft which turns at engine speed - all the time the clutch is engaged. I'd get up in there with a borescope to see what's going on first.

 

[Bob Rooks]

 

[Bob Rooks]

 

[Bob Rooks]

 

[Bob Rooks]

Pulling the top covers off for inspection isn't terribly bad.

 

[Midniteoyl]

Def not good! I 2nd that you need to do a teardown..

 

[Bob Rooks]

What's curious is that the inner race is intact, so I'll speculate that the live (upper, #1) PTO shaft has parted. This is the tang drive PTO that you should not be able to turn with your hand. In fact I think if you reach up in there you'll find a piece of shaft laying around. That said, you still have full use of your 540/720 r/m PTO. At this point no further damage should be expected, pending inspection. You COULD do two thorough kerosene flushes, top up with new oil, and be on your way.

 

[ptsg]

There should be some numbers on that broken bearing. I would look for those, then compare with the parts diagram that Bob Rooks have been sharing. This should give an idea of where this bearing is located on the machine.