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Adjusting a new Deore XT hub

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Adjusting a new Deore XT hub

Old 07-09-13, 02:58 PM
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bikemig 
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Adjusting a new Deore XT hub

So I just picked up a machine built wheelset with Deore XT hubs and Mavic A719 rims. I'm a stumped by how to adjust the cones on the Deore XT hubs. They're marked HB-T780 and appear to have retainers for the ball bearings according to the Shimano schematics. The problem is that there is only one "gizmo" (how's that for technicalese) on each side with a flat that will take a cone wrench. The cone has a flat but the locknut is simply round. These are the schematics for the front: http://techdocs.shimano.com/media/te...9830758224.pdf. These are the schematics for the rear: http://cycle.shimano-eu.com/media/te...9830758219.pdf. I'm obviously missing something obvious here but how do I adjust these things?
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Old 07-09-13, 03:08 PM
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It looks like I may have unstumped myself. I just looked at another Shimano pdf, http://cycle.shimano-eu.com/media/te...9830750036.pdf. Apparently this takes a 5 mm hex to adjust the locknut and the cone takes a 17 mm. I'm not sure what I think of this design since it appears to use a proprietary axle design.
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Old 07-09-13, 03:25 PM
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The Deore XT 780 hubs are for trekking/touring. It minimizes the need for tools for on-road maintenance. Both front and rear hubs use proprietary length axles and end cap nuts that thread over the axles. I like the design as long as maintainers don't over torque. I've never had many axle issues with any Shimano freehubs so having a proprietary axle doesn't really bother me. But all portable tool kits have a 5mm allen. But I don't always carry two 17mm cone wrenches on tour.
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Old 07-09-13, 09:02 PM
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That makes sense in terms of tools. Still I'm a little bummed in terms of the axle and the various pieces that make up the hub being proprietary. I'm a little concerned about getting spare parts in the future if Shimano changes its design (not that Shimano would ever do that . . . )
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Old 09-15-17, 12:34 PM
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Originally Posted by gyozadude View Post
The Deore XT 780 hubs are for trekking/touring. It minimizes the need for tools for on-road maintenance. Both front and rear hubs use proprietary length axles and end cap nuts that thread over the axles. I like the design as long as maintainers don't over torque. I've never had many axle issues with any Shimano freehubs so having a proprietary axle doesn't really bother me. But all portable tool kits have a 5mm allen. But I don't always carry two 17mm cone wrenches on tour.
(sorry to resuscitate an old thread)

My wheels are built on XT 780 hubs. There are no signs of wear. They have something like 8 000 kms, rarely in the rain.

What telltale sign would indicate that they need repacking?
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Old 09-15-17, 01:33 PM
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Originally Posted by gauvins View Post
(sorry to resuscitate an old thread)

My wheels are built on XT 780 hubs. There are no signs of wear. They have something like 8 000 kms, rarely in the rain.

What telltale sign would indicate that they need repacking?


Mostly, the 8,000 kms.


How do you know there are "no signs of wear" until you disassemble, and, once you've disassembled, why would you not repack the bearings?
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Old 09-15-17, 02:35 PM
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Originally Posted by kevindsingleton View Post
Mostly, the 8,000 kms.


How do you know there are "no signs of wear" until you disassemble, and, once you've disassembled, why would you not repack the bearings?
+1

They call it PREVENTIVE maintenance for a reason.
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Old 09-16-17, 06:50 PM
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Originally Posted by kevindsingleton View Post
Mostly, the 8,000 kms.


How do you know there are "no signs of wear" until you disassemble, and, once you've disassembled, why would you not repack the bearings?

+1, Andy
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Old 09-18-17, 03:43 PM
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Originally Posted by gauvins View Post
(sorry to resuscitate an old thread)

My wheels are built on XT 780 hubs. There are no signs of wear. They have something like 8 000 kms, rarely in the rain.

What telltale sign would indicate that they need repacking?

I overhaul mine every 2500 miles and they have lasted over 60k miles and still going strong. One time I got lazy and went 5k miles and had to replace one cone. shimao rear hubs.
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Old 10-28-17, 11:18 AM
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Originally Posted by davidad View Post
I overhaul mine every 2500 miles and they have lasted over 60k miles and still going strong. One time I got lazy and went 5k miles and had to replace one cone. shimao rear hubs.
Do you reload the retainers or just use loose balls?
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Old 10-28-17, 11:25 AM
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I wouldn't worry about the design of XT cup and cone hubs. They catch the bullets and shoot them back. You still need to do the maintenance.

Last edited by grizzly59; 10-28-17 at 10:27 PM.
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Old 10-28-17, 01:19 PM
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the one thing that would make me walk away from an otherwise good looking deal on a car/motorcycle/bicycle is the words "I've never had to do a thing to it!"
the seller is always so happy to share that statement... they proudly proclaim that they have never done any routine maintenance to the machine.....

disassemble, clean, inspect, regrease, assemble.... before you have to see if Shimano still sells parts for your limited production hub.

Last edited by maddog34; 10-28-17 at 01:22 PM.
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Old 10-28-17, 10:34 PM
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Originally Posted by kingston View Post
Do you reload the retainers or just use loose balls?

Mine don't have retainers just loose balls.
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