What I'm I doing wrong? Shimano hub rebuild
The rear hub on my winter bike is starting to really bug me, I just can't seem to get it set up right.
A bit of background:
The wheels had done about 5000 miles on them from May - Jan this year when I decided I really ought to strip them down, that was the first sign of any 'roughage'. Thankfully they were in a pretty decent condition so I replaced the bearings, repacked with a generous amount of grease and off I went.
Several weeks later there was a fair amount of grease escaping so I decided to strip them down again; this time the DS was almost empty of grease, repacked once more and all was fine.
Two weeks ago I decided to carry put preemptive maintenance so once more I stripped them down, some signs of wear in the cups but nothing (IMO) horrendous, this time however getting the adjustment proved to be hugely problematic, it was either too tight or too loose, despite minute adjustments. Eventually I got it running as smooth as possible, happy days!
Due to bad weather this weekend I used the winter bike instead of my good bike for the Lincoln Sportive, on cleaning bike when I got home I noticed a fair bit of play in the rear wheel; once more I stripped the hub down to reveal almost no grease in the NDS.
I'm I doing something wrong or is my hub beyond repair?
My method is as follows:
Cassette off
Slacken NDS cone
Remove axel from DS
Thoroughly clean cup & cones
Fill with grease using a grease gun
New bearings in
Axel back in
Attach DS cone
Adjust on bike with wheel attached to frame as per Park Tools suggestion.
A bit of background:
The wheels had done about 5000 miles on them from May - Jan this year when I decided I really ought to strip them down, that was the first sign of any 'roughage'. Thankfully they were in a pretty decent condition so I replaced the bearings, repacked with a generous amount of grease and off I went.
Several weeks later there was a fair amount of grease escaping so I decided to strip them down again; this time the DS was almost empty of grease, repacked once more and all was fine.
Two weeks ago I decided to carry put preemptive maintenance so once more I stripped them down, some signs of wear in the cups but nothing (IMO) horrendous, this time however getting the adjustment proved to be hugely problematic, it was either too tight or too loose, despite minute adjustments. Eventually I got it running as smooth as possible, happy days!
Due to bad weather this weekend I used the winter bike instead of my good bike for the Lincoln Sportive, on cleaning bike when I got home I noticed a fair bit of play in the rear wheel; once more I stripped the hub down to reveal almost no grease in the NDS.
I'm I doing something wrong or is my hub beyond repair?
My method is as follows:
Cassette off
Slacken NDS cone
Remove axel from DS
Thoroughly clean cup & cones
Fill with grease using a grease gun
New bearings in
Axel back in
Attach DS cone
Adjust on bike with wheel attached to frame as per Park Tools suggestion.
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Comments
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Have you checked to see if the axle is bent?0
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Bet the freehub is worn internally. sounds like my wheels when the freehub is past its best,
and being shimano you can't easily service them.0 -
All I can think of is that the lock nuts are not tight enough, allowing the cones to move out a fraction. I annually service my Shimano hubs, and whilst it is fiddly getting them set up again, have never had a problem. Some grease escape is normal in the first few rides. If you are seeing an excessive amount escape, may be too much was packed in?0
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Too thin grease? thin grease will often come out quickly and certainly quicker than thicker more appropriate stuff.0
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Term1te wrote:All I can think of is that the lock nuts are not tight enough, allowing the cones to move out a fraction. I annually service my Shimano hubs, and whilst it is fiddly getting them set up again, have never had a problem. Some grease escape is normal in the first few rides. If you are seeing an excessive amount escape, may be too much was packed in?
My thoughts but I'm not sure what is causing the nut to come loose; certainly on initial tightening it's as tight as I can manage by holding the cone with a cone wrench and adjusting lock nut with adjustable spanner.
Grease I used this time was Helfords teflon, previously it was Fenwicks.0 -
I also have never had a problem setting up any shimano hub. If the cones are worn replace them that helps but even with worn cones setting up a hub is normally fairly straight forward. There may or may not be an issue with the hub and unless I actually have a play I cannot tell you what the problem is.
The thread on the locknut or the axle maybe damaged which can cause it to loosen off. Mild lockite is another solution but check the threads first.http://www.thecycleclinic.co.uk -wheel building and other stuff.0