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Need Help with mavic es hub problem

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Need Help with mavic es hub problem

Old 03-15-09, 04:42 PM
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roadie138
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Need Help with mavic es hub problem

When going down a hill my mavic hub is making a bad squealing noise [it sounds like its comeing from the hub] and the cassette looks like it's going forward a little and the chain goes slack does anyone have a clue on whats going on.I took the cassette off and everything seems normal.
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Old 03-15-09, 05:06 PM
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Could I have put my cassette on to tight?
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Old 03-15-09, 05:12 PM
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you need to take off the hub body and lube the bushing in there.
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Old 03-15-09, 05:53 PM
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OK just took it out and went down a few more hills not only was the squealing noise really bad the cassette is definitely is going forward and the chain goes slack.then if I pedal it will stop .How do I take the hub body off a mavic ksyrium es?
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Old 03-16-09, 06:51 AM
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The axle must be removed first. Use a 5mm hex wrench on the right (drive) side. The left end of the axle pulls off by hand. Insert a 10mm hex wrench into the left side and the unscrew the right half of the axle. Once the axle halves are unscrewed, they just slip out. Then the cassette body will also pull off by hand. Be careful not to lose the two pawls or the tiny springs under them, mounted to the hub. The pawls also come off by pulling gently. There is a loose washer on the inside of the cassette body, against the cartridge bearing to keep track of.

Clean the inside of the body with mineral spirits, then apply a small amount of oil to the inside of the cassette body, including the plastic bushing and pawls. I've used ordinary 5W30 weight motor oil. Reassemble, being sure not to forget the washer for the cassette body bearing. I insert the right side of the axle to be sure the washer goes over it, before pushing the cassette body back on. You may have to push the pawls down a bit to get the cassette body to slip over them.

If you really want to be thorough, you could remove the rubber seals from the two cartridge bearings in the hub and the one in the cassette body, clean out the old grease with mineral spirits, allow to dry, then pack heavily with new grease and replace the seals. Installing new cartridge bearings takes even less time.

The bearings required for the rear hub and cassette body are one 6903 and two 608 bearings. The front wheel requires two 6901 bearings.

If you want pictures and more info:

Website: http://www.tech-mavic.com/

Login: mavic-com
Password: dealer
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Old 03-16-09, 10:35 AM
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WoW Thanks Dave thats just what I needed I will give it a try. Went to my LBS they told me they would have to order a cassette body and they would just pull the bad one out and put the new one in .Don't look like it works that way?
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Old 03-16-09, 10:51 AM
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mavic cosmos

Thanks for the detailed info on mavic ksyrium wheels. I have mavic cosmos wheels, with some play notice-able in the rear wheel. I went to the link you gave to mavic and could not find info on cosmos. Perhaps they are older and therefore not listed on their site anymore. Would there be any difference in procedure between the two types? Anyone with experience with cosmos? I'm fairly new to road biking, very new to this forum, and extremely appreciative of the knowledge that others have to share.

Last edited by davidtodd4; 03-17-09 at 07:54 AM. Reason: Needed direct questions answered.
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Old 03-16-09, 04:30 PM
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Originally Posted by roadie138 View Post
WoW Thanks Dave thats just what I needed I will give it a try. Went to my LBS they told me they would have to order a cassette body and they would just pull the bad one out and put the new one in .Don't look like it works that way?
Relubing is probably a 10-15 minute job. There is no need to replace the cassette body unless it gets so worn than the pawls no longer engage properly and skip under load.

A new cassette body is only about $50 from Excel Sports.
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Old 03-19-09, 06:42 PM
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Originally Posted by DaveSSS View Post
Relubing is probably a 10-15 minute job. There is no need to replace the cassette body unless it gets so worn than the pawls no longer engage properly and skip under load.

A new cassette body is only about $50 from Excel Sports.
Dave do you take your cassette body off and lube your wheels once a year?
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Old 03-19-09, 07:50 PM
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Originally Posted by roadie138 View Post
Dave do you take your cassette body off and lube your wheels once a year?
I clean and lube my two Mavic wheelsets every six months. Everything works great.
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Old 03-20-09, 03:36 PM
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How do you adjust the bearing free play?
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Old 03-20-09, 03:45 PM
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Originally Posted by roadie138 View Post
How do you adjust the bearing free play?
I was once given a pointer on this forum as to how to adjust the bearings by a gentleman with the call-sign cascade168, who had worked at MavicUSA at one time. What he said was to tighten the bearing with the Mavic bearing tool until snug (not tight), then back off 1/8 of a turn. This advice has worked well for me.
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Old 03-26-09, 03:56 PM
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Well I took it apart per Daves instructions.All turned out well.Lucus adjusting the bearing like you said seemed to work to.So far it has not made the bad squealing noise that it was making. It did not always make the noise on every ride and I have only did one 25 mile ride so I hope cleaning it and oiling it fix the problem.. I can't believe how much quieter it is.How do you know how tight to get the axle halfs?Are the bearings easy to replace?The reason I ask is because mavics tech manual says you need need a bearing puller to take them out and mount them.

Last edited by roadie138; 03-26-09 at 04:08 PM.
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Old 03-26-09, 06:02 PM
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Originally Posted by roadie138 View Post
How do you know how tight to get the axle halfs?
Be very careful tightening the axle halves. I once stripped the axle on my Ksyrium SSC SL by over-tightening the halves. I had to order a new axle from MavicUSA. And it wasn't cheap. Just tighten until just snug. It is very easy to strip while over-tightening.
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Old 03-28-09, 04:49 PM
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Thanks for the heads up on that LUC.Have you ever had the bearing out on one?
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Old 04-03-09, 08:13 PM
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I found this and it should really help some of you Mavic owners out .Remember Mavic says you should do this twice a year.Check it out http://roguemechanic.typepad.com/rog...echanic-m.html
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Old 06-11-15, 03:04 PM
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Originally Posted by roadie138 View Post
When going down a hill my mavic hub is making a bad squealing noise [it sounds like its comeing from the hub] and the cassette looks like it's going forward a little and the chain goes slack does anyone have a clue on whats going on.I took the cassette off and everything seems normal.
The lubing is as mentioned already; mineral oil is NOT what you'd buy at the drugstore; Dumonde Freewheel oil works, safely, so let it be.
There is another aspect I've seen on my Crossmax MTB wheel, exactly as you describe, but even more subtle, I found the chain wrapping tendency was far worse if the chain was on the large/inner cog, and shifting out to next-to-high gear (I stay off high in case the chain were to bounce off and wedge against the frame) could reduce the issue significantly. My theory is that in high, the pressure against the freehub innards is borne more by the sealed ball bearing, but in low gear it is pressing more on that nylon inner bushing, which is prone to drying out, wear, and contamination, and friction. The drag may be greater as well, but only when coasting, not pedaling.
There is a fellow who sells excellent aftermarket versions of these bushings on eBay; they are not too hard to replace, if yours are worn beyond simple re-lubing, and just be aware that behavior is a symptom of overdue servicing. Mavic is useless nowadays for support.
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Old 06-11-15, 04:44 PM
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MAVIC has always been useless for support.

I am over them...
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Today, I believe my jurisdiction ends here...
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Old 06-11-15, 05:16 PM
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^ Another great (and cheap) lube for Mavic freehubs is Shimano Hydraulic Brake Fluid. A liter is real cheap and lasts a long time. I totally recommend it as a Mavic freehub lubricant.
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Old 06-11-15, 07:57 PM
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I always used Pedros road rage which worked excellent But its been discontinued Now I use Pedro's GO lubricant which works just as well.


http://pedros.com/faqs/which-lubrica...mavic-freehub/
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