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The bearing clearance is set with a dial indicator. M/B wants .0005" free play in the bearings. Good luck trying to get that by feel. Others have tried and failed...........and cooked the bearings in the process.
Like most tapered roller bearings, they are intolerant of any preload and it shortens their life dramatically.
If you must do it without the indicator, be absolutely sure you can hear the slightest bit of movement in the spindle when you push and pull on the rotor. This amount of clearance is much greater than .0005" but it's far better than the alternative.
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