Bearing race wear or bent axle (in Dynamo hub)?
Posted: 2 May 2016, 9:57am
Hello all,
Problem: when the axle is rotated there is obvious grating/grinding at the same position each revolution.
The hub is a Shimano DH-s501 Alfine front dynamo and the grinding (above the normal dynamo notch-resitance) is once per revolution. This makes me think the bearing races (either the captive in the hub and/or the screw-down upper race) are worn, or the axle is bent. Would anyone agree?
If the it were ball bearing wear, then I would expect the grating to occur at any position, which isn't the case.
I've looked at the races on both sides of the hub (oddly all Shimano tech pages shown only the race on the non-electrical side) and can't see anything obvious. I've replaced balls on non-electric side with 3/16" SS (no change) and am going to to the other side today (I don't expect it'll make any difference).
There is mixed opinion about this hub online based on some comments about early failures. I'm thinking it's beyond economic repair (would be close to £50 in parts for races and axle I've had thought, that's if the parts are actually available).
Any thoughts before I ditch it and build up a new dynamo wheel?
Ta, Nathan.
Problem: when the axle is rotated there is obvious grating/grinding at the same position each revolution.
The hub is a Shimano DH-s501 Alfine front dynamo and the grinding (above the normal dynamo notch-resitance) is once per revolution. This makes me think the bearing races (either the captive in the hub and/or the screw-down upper race) are worn, or the axle is bent. Would anyone agree?
If the it were ball bearing wear, then I would expect the grating to occur at any position, which isn't the case.
I've looked at the races on both sides of the hub (oddly all Shimano tech pages shown only the race on the non-electrical side) and can't see anything obvious. I've replaced balls on non-electric side with 3/16" SS (no change) and am going to to the other side today (I don't expect it'll make any difference).
There is mixed opinion about this hub online based on some comments about early failures. I'm thinking it's beyond economic repair (would be close to £50 in parts for races and axle I've had thought, that's if the parts are actually available).
Any thoughts before I ditch it and build up a new dynamo wheel?
Ta, Nathan.