Pir0

Hi, i'm relatively new to bike maintainance, especially when dealing with the internals of hubs as i've never worked on one.


I recently acquired a Mavic rear wheel, which has a Mavic 501 hub and a Sachs 80's cassette. The quick release appeard stuck when i removed it from the bike i bought, and when i put it onto the other bike, because the rear drop outs were the correct distance apart, the hub set nicely into the dropouts but woukldnt clamp due to the skewer not being able to clamp.

I tried hitting the skewer a few little taps and it didnt free up, so i tried freeing it up by rotating the skewr inside the axle but sheared the clamping end of the skewer off...

I took off the cassette and cone adjusters and can't seem to see where I go from here.. Is there anyway to replace the axle on this hub? It appears the hub uses catridge bearings rather than roler bearings or caged bearings. I'm aware some hubs can't be reconditioned, so.. I'm looking some advice on what to do now as the quick release just won't budge.

[Sorry about the large pics but i didn't have much time to resize them.]

bdcheung

Have you tried the Bicycle Mechanics forum?

https://www.bikeforums.net/forumdispl...ycle-Mechanics

cyccommute 

The threaded end of the skewer is bent. This happens all too often. However, I think you've been pounding on the wrong side. From your last picture, there's too much of the skewer sticking out on the threaded side. Cut the threads off above the bent part of the skewer but leave some material outside of the axle. Don't worry about trying to save this quick release since it's toast.

Gently tap on the drive side of the quick release and drive it out. You may need to use a long narrow punch to get the skewer all the way out. But if you get rid of the bent part it will be easier. Good luck.

Pir0

I think i bent the skewer tapping it with a hammer. I put the bolt back on and tapped the bolt as to not damage the threads, however this was prior to the clamp snapping.

I was hitting it from the drive side as i was aware that large clamp would never fit through there

You can almost see from the pictures that there seems to be some damaged threads. Is there anyway to replace the axle?
I've never taken these out and nor do i know how to.

If the skewers gone to far in on that side there's clearly a lot of interference and has to have made a sort-of pressfit to the axle, which squeezes some of the material inwards, making the diameter of the hole for the skewer on that side too large? Won't this happen again if i ever get it out?


Btw I'm really sorry, i must have skimmed over the contents of the forum about 5 times and not once did i notice the Bike Mechanic section. If any of the moderators could move this I would be extremely greatful.

Psimet2001 

bang the skewer out. Axle is probably bent. That hub has seled bearings and is serviceable. if you don't know how to service it or can't igure it out a good LBS should be able to do it for you easily. Replacement parts should be available.

cyccommute 

From your second picture, it looks like the clamp side of the skewer has been driven into the axle, hence the idea that you'd be hammering on the wrong side. You've got too much thread sticking out of the drive side too. Quick release skewers can also get bent from improper use and, since the intererior diameter of the axle is small, this can lead to difficultly in removal. Looking again, you seem to have lots of room.

Try laying the wheel over a gap that you can let the axle hang down into. A bench vise works well or just a hole. You want the wheel to be resting on the hub shell on the nondrive side. Thread a couple of quick release nuts on to the drive side (try to straighten it a little). You want to have the flat part of the top nut to be flush with the top of the threads but in contact with the lower nut. This will give you more surface to hit with a hammer. Use washers to make up the difference if necessary.

Drip some penetrating oil into the axle and let it soak for a while. You may have some corrosion inside the axle that binding the skewer. Hammer on the nut and see if you can drive the quick release out. You may only succeed in driving out the axle (it's probably a press fit. Work a little at a time. If you do drive the axle out, you're half way to servicing the bearings

I doubt if you can get parts for this hub. It's from the 80's and I doubt that you'll be able to find anyone who would have something for it. Bearings are pretty standard and you can get them but the rest is just too old.

jbhowat

I bet the axle is bent. You're probably going to have to have a mechanic rebuild the hub with a new axle and bearings - I'd just bring it to them as-is and save yourself the frustration of trying to get it out only to see that the new QR won't go in right either (or worse, get stuck!).