Rosco:
It sounds like you have done a great job on the install on your wood blocks. I believe it to be true that the [correct and meticulous] install has just as much to do with longevity than the block/bearing itself. If the thing is not installed correctly, or is in a bind,
it will not last long....
whether it be a cast-alloy bearing, or a wood block..
My 9600 originally came with wooden blocks. When my combine went in for the 'Green Light Special" @ the JD House, they recommended cast alloy bearings, both front and rear. The mechanic that did the work on my combine was so meticulous...I attribute his work ethic and 'style' to my walker bearings lasting so long...that and a bunch of grease!
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As for the blocks themselves, though, I was wondering if BrewMax should be asking for 8820 blocks ; or should he be asking for 9610 (or maybe even 9650 WTS) [upgraded] blocks. [Rosco,] Are your blocks "oil impregnated"? I realize that the "oil" in them will not last long, but I was under the impression that Mother Deere had come up with some sort of 'upgrade' pertaining to the block(s). Are your 8820 blocks 'oil impregnated', or just 'normal'?