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Re: janicholson...preload bearing torque??

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12-27-2012 14:46:50

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In that size range the bearing should be tightened carefully while tapping on the hub with a brass hammer to settle all races against the shoulders. they should be tight enough to feel strong resistance to turning by hand, and rolled several turns. Then back off the nut and tighten them till a spring scale will turn the hub at the sprocket at about 10 oz of force pulling tangentially to the sprocket tooth. Again rotate and tap on it to assure seating, and test the rotational force again. Jim

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12-27-2012 14:57:46

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 Re: janicholson...preload bearing torque?? in reply to Janicholson, 12-27-2012 14:46:50  
should the bearings be dry or oiled???

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12-27-2012 17:43:51

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 Re: janicholson...preload bearing torque?? in reply to glennster, 12-27-2012 14:57:46  
Installed and packed if they get grease or oiled with the axle oil if not. They stay assembled from that point. Jim

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12-27-2012 19:06:55

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 Re: janicholson...preload bearing torque?? in reply to Janicholson, 12-27-2012 17:43:51  
Ok, thanks for your help jim,

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12-27-2012 19:24:28

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 Re: janicholson...preload bearing torque?? in reply to Glennster, 12-27-2012 19:06:55  
You are welcome. I have had experiences engineering those bearing sets on equipment for industry, and as a mechanic working on them for 45 years. Tapered roller bearings must have preload in proportion to their size, and because they have continuous line contact as they operate. If allowed to be loose (at all) they loose the line contact, and become rapidly worn and brinelled from point like contact at even tiny angels. Jim

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