What happened to these?
08-11-19, 07:27 PM
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OK Folks,I got a repair in today for a hub overhaul. These are the bearings that came out of the Shimano 600 Arabesque front hub. Hub was overloaded with white lithium grease, which is a pita to remove, but the bearings seem to be problematic. Any guesses? Maybe they were trying to make them look like ceramic bearings? Or just heat treated chrome? fire away at me with opinions... Smiles, MH
08-11-19, 11:42 PM
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I count 21 bearings from a front hub. From my poor memory Shimano 600 should be 10 each side. Further too much grease in a 600 hub is not going to be with the hub very long and would not burn balls. Coming from maintenance experience in smelters where we dealt with extremely high temps I doubt the entire premise, I think these came form somewhere where nothing was correct and no one corrected, I think Andy said that already. Nothing learned.
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08-12-19, 07:21 AM
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I count 21 bearings from a front hub. From my poor memory Shimano 600 should be 10 each side. Further too much grease in a 600 hub is not going to be with the hub very long and would not burn balls. Coming from maintenance experience in smelters where we dealt with extremely high temps I doubt the entire premise, I think these came form somewhere where nothing was correct and no one corrected, I think Andy said that already. Nothing learned.
What usually happens is an inability to adjust the bearing/axle spin/slop balance properly and the rim "becomes" out of true (but in an odd manor). The rim will go through a cycle of wobbliness every two rotations as the 11th ball is revolving about the cone at about half the speed that the rim does. So the offset that that 11th ball creates will travel. The first time one encounters this can be rather frustrating. Trying to true out said traveling wobble...
Just goes to show that a system starts at it's innermost foundation. Andy
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08-12-19, 07:25 AM
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This thread is not too different from what goes on in a LBS shop all the time. It's how we teach those less experienced.
A question/situation is presented. Thoughts/ideas are talked about and deeper layers of understanding are brought up. I have done this, perhaps, hundreds of times over the years with some of the goal being not just specific causations but also how to think and work out what's happening. It's this second aspect that I feel is the greater lesson. Andy
A question/situation is presented. Thoughts/ideas are talked about and deeper layers of understanding are brought up. I have done this, perhaps, hundreds of times over the years with some of the goal being not just specific causations but also how to think and work out what's happening. It's this second aspect that I feel is the greater lesson. Andy
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08-12-19, 12:38 PM
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OK, guess I'm just a poor student as the lesson I was meant to learn from this thread still eludes me. Thanks for trying!
08-12-19, 06:45 PM
#32
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OK Folks,I got a repair in today for a hub overhaul. These are the bearings that came out of the Shimano 600 Arabesque front hub. Hub was overloaded with white lithium grease, which is a pita to remove, but the bearings seem to be problematic. Any guesses? Maybe they were trying to make them look like ceramic bearings? Or just heat treated chrome? fire away at me with opinions... Smiles, MH
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