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Hey there John, Well to begin with, if youre replacing the old fan shaft and havent done any other changes, and it wasnt noisy before nor the fan had too much backlash, you would want to install the same gaskets/shims that it had when you tore it down. If it had too much backlash and you try and compensate by ONLY removing fan hub shims, but NOT correspondingly adjusting the bearign end cap shims (to get proper heel and gear mesh), then you may end up with a bad mis match and bevel gear whine. Normally, if youre starting from scratch, the gear mesh and heel to heel and backlash are adjusted by BOTH the number of shim gaskets between the fan shaft hub AND the gasket/shims under the bearing end cap. Those two distances/clearances determine the bevel gears locations to achieve proper mesh and backlash. Now, if you dont want to remove the governor to try and set the proper bevel gear mesh, you can try and add or remove the gasket/shims under the fan shaft hub until you achieve the proper shaft backlash, (it has to have play, but no more than needed) and hope for the best. If the mesh isnt right or too much backlash, youre gonna end up with a noisy whiney governor. If when youre done, the fan can turn bac n forth 3/8 to 5/8 inch or so, backlash isnt too bad, but that dont necessarily say the gear mesh is correct. If you decide to remove the governor so you can lay it out and mesh the bevel gears, dont forget to remove that oil line up underneath and to get it in time when you reinstall it. If you want to replace either of the bevel gears (fan shaft or governor shaft) they need to be a matched set (new or used) Its hard to ever match two different gear sets. I hope this helps, post back any more questions and myself or others will try n help. Good Luck n God Bless Ol John T Nordhoff in Indiana
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