Author Topic: Dynamo wheel cones  (Read 316 times)

Dynamo wheel cones
« on: February 03, 2019, 10:25:39 pm »
On swopping out some tyres detected lateral movement in front dynamo hub wheel bearings. Initially adjusted with cone spanners resulting in bearings became very notchy which would kill the bearings in short order. Slackened right off and then tightened by hand. Wheel  movement has disappeared. Is this tight enough?
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Re: Dynamo wheel cones
« Reply #1 on: February 03, 2019, 11:08:26 pm »
if this is a shimano QR hub generator then the correct adjustment is a tiny bit of free play in the bearings that just disappears as the QR is used to fully tighten the wheel in the frame.

If you have finger tightened the cones and then tightened the locknuts and QR on top of that then the bearings will likely be seeing a monster preload and will be merrily destroying themselves.

If you adjust the cones so there is free play when the QR is tight, and increment (in very small amounts) towards a tighter setting, each time suggin gthe locknut down and tightening the QR, you will avoid having a monster preload on the bearings.  The first time there is no free play (with the QR tight) you are done.