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DA HB-7600 Hub Problem

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DA HB-7600 Hub Problem

Old 05-06-11, 04:54 PM
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DA HB-7600 Hub Problem

So, today as I was putting on a new tire I discovered that my rear axle does NOT spin freely. The set up is an Open Pro laced to a DA, as said in the title.. I can't even spin the axle with my fingers. My first thought was the cones must be too tight. I have ONE cone wrench and when I tried to loosen one side, it spun the axle but didn't loosen the cone.. I'm wondering if this could be caused by over-tightening the bolts on the hub when putting it on the frame. The last time I had the wheel off, the hub spun smoother than glass. Then, one day it's like this.. If anyone has ever had a similar problem or has any input on this I'd appreciate it. Thanks for all your time.
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Old 05-06-11, 05:03 PM
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You need 2 cone wrenches to properly adjust a hub with open bearings and a cup and cone design. What probably happened is that when you tightened the axle nut, you rotated the axle, which tightened the cone excessively.
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Old 05-06-11, 05:07 PM
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From pictures of DA hubs it looks like he can use a regular wrench for the locknut, but it doesn't sound like he had.

Here is a good hub adjustment tutorial, just get the correct wrenches since Shimano doesn't use "standard" sizes (I dont know what the DA track hub uses)

Last edited by hairnet; 05-06-11 at 05:12 PM.
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Old 05-06-11, 05:10 PM
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Originally Posted by TejanoTrackie
You need 2 cone wrenches to proper adjust a hub with open bearings and a cup and cone design. What probably happened is that when you tightened the axle nut, you rotated the axle, which tightened the cone excessively.

This is common and normal with those hubs. i just adjusted mine last night. Same hubs.
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Old 05-06-11, 05:59 PM
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This happen to me once, But it the cones didn't tighten, They actually loosened causing my bearings to have play left in right.
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Old 05-06-11, 07:56 PM
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The way I was taught was to adjust the cone so that there is no play but the axle spins smoothly. Then with one cone wrench holding the cone stationary, tighten the locknut against the cone.

At least that's how I do it... I never understood those tutorials until I watched someone do it at the co-op.
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Old 05-08-11, 04:55 AM
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Originally Posted by carleton

This is common and normal with those hubs. i just adjusted mine last night. Same hubs.
I've been taking care of my DA hubs with just 1 cone wrench for over 2 years. One side is glued in place or whatev, so just using a crescent wrench on that side and a cone wrench on the other works just fine
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Old 05-08-11, 07:49 AM
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true, one side can always stay fixed and you do all adjustments on the other, but easiest way is still two 14mm cone wrenches and two 18mm wrenches for the nuts. that's for a rear DA 7600. The front one takes 13mm cones wrenches I think. Took me forever to get the adjustment right the first time, but ones you got the cones right, the lockring/washer should prevent you from simultaneously tightening the cones when you tighten the nuts or mount it to the frame/fork.
Are you sure you have those washers between the cones and the nuts?
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