If it was my deck considering what you have tried I would disassemble the spindles, clean the parts, inspect and replace as needed. Download one of the deck service manuals from the tech library, most of the spindles are all the same. This is how they go together.
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2264 with 54 GT deck
1641 AKA Black Jack with a 402-E Haban Sickle bar mower
JD317 dump truck
BX2670 with FEL
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