Jwalter04,

Actually the original alternators were made in Japan (as were the Yanmar engines...) Here is the alternator section from the engine manual:

View attachment alternator section of CTM12.pdf

The alternator part number from The PC2139 parts catalog is AM877557 ALTERNATOR (SUB FOR AM876055) -- but an even more current number is MIA10338 as seen here:
https://www.greenpartstore.com/John-Deere-20-AMP-Alternator--MIA10338_p_13360.html

These are not cheap, and there are some on ebay and other sites but used is its own set of risks...

Chuck

...by the way, the 322 alternator is indeed the same unit...

 

Here is one that will fit a 322 for 70.00:
https://www.amazon.com/deere-am877557-am879144-mia10338-alternator/dp/B00OBU7Q16

 

Wow. Top notch info guys. Thank you. I think I’ll swap the one off the 322 for now and see if I can get the seized one apart. Again, good stuff.


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I think I found the problem.


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Those are easily and cheaply replaced. I had the same thing happen a few years ago.
Tom

 

Does anybody know the part # or the size of this bearing, I'd like to be prepared just in case mine beats the dust. Thanks!

 

My advice is not to wait until the bearings fail. Consider replacing them before catastrophic failure occurs, they tend to get noisy beforehand
but not necessarily, I wouldn't rely on that as a definite precursor. They are relatively inexpensive and quite easy to replace.....:thumb:

 

6201z


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Okay thanks, I'll follow your advice!

 

Agree on doing the bearings. The belt isn't that expensive to replace but the amount of labor to replace due to the radiator and drive shaft makes it a fun day.

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Lastly- lots of tractors have that alternator. Pretty sure my 4115 jd cut has it too.

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