Thanks guys. I do (with some contorting!) have access from above as the panel is positioned over the engine block with the fan itself being "tucked under". The problem that I have encountered is that the fan blades are very closely spaced and getting my hand in between them to reach the hub is a challenge! But, I CAN get my left hand in there (barely!), along with a box end wrench, but I only have enough space to use the fingers on my left hand to pull the wrench, and I just can't develop enough torque to free the bolts! Of course all of this is done by feel, not by sight! Suggestions?
If I should eventually get it apart, what other parts are necessary to switch over to the greaseable bearing?
I have maintained modern farm equipment my entire life so am not a novice at removal and repair at any level. Also humble enough to know that asking others for ideas is a smart thing to do - so input gladly accepted! :-)
Thanks!
John