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Front cracking noise
Hello again,
I have finished repairing my front hub dynamo, that was making a cracking or clicking noise, and that eventually started to produce a high drag against wheel rotation. That hub dynamo is a Shimano DH-3N31, and I was able to open its ball bearings with no issue. In particular, without breaking the phase wire! The right (drive and power output side) bearing locknut was loose, which allowed the corresponding cone to become loose as well, which I think was the cause of the noise, and at some point to tighten itself, causing the later drag. I noticed the right side of the dynamo was distorted, with part of it pushed inside by a bit less than one millimetre. I suppose I must once have caught something between the fork and the hub, that would have applied a pressure against the dynamo and moved the locknut, causing all this trouble. Now, since the dynamo is still working correctly, I think I will use it for a while and monitor it closely before replacing it. These things are not really cheap, especially when you buy them with a prebuilt wheel. I cleaned the ball bearings, greased them and replaced the balls. The left-side ones were clearly damaged, but not broken, and the right-side ones seem intact, but I replaced them nevertheless. One thing to notice with the dynamo hub, compared to a regular hub, is that you cannot remove the axle after just removing the locknuts and cones on either side, or even on both. This is because the dynamo stator is installed on the axle, and it is caught inside the rotor and hub, that forms a cage around it. There is some play though, and when adjusting the cones back, you have to make sure you are in the middle of that play, otherwise you could be forcing the dynamo stator against the side of its cage. The point of contact are supposed to be the balls, and nothing else! Now that I have adjusted the cones and locknuts again, it seems to work just fine. Thanks for all the advice! -- Tanguy |
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