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help a problem on foot nut unit

Old 01-13-17, 04:38 PM
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help a problem on foot nut unit

hi guys,
i have a problem of a "foot nut unit", it doesn't stop and continues to spin and spin, i have an o-ring around of "foot nut unit" and sometimes oil dripping from the fork, i think because it is not sealed
so help me please
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Old 01-13-17, 05:26 PM
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Drawing is a bit small but a google on 'foot nut on ATB forks' brought up several threads showing others have
had this problem with various solutions. https://www.google.com/webhp?sourcei...ut+on+ATB+fork
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Old 01-13-17, 07:07 PM
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1) Without knowing the exact model of fork, everyone here will be guessing what you need to do.

2) If it's been leaking oil, it likely needs to be pulled apart completely to be serviced (re-fill the oil/replace damaged seals).
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Old 01-13-17, 09:44 PM
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Find the service Manual , online, read it.
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Old 01-14-17, 09:49 PM
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My old Marzocchi fork had that problem sometimes. IIRC the solution was to compress the fork as much as possible while tightening the nut.

It's also super easy to strip out and one of those things you actually have to pay attention to the torque value on. I'd see if you can back it off first and make sure the threads on both pieces look okay.

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Old 01-15-17, 04:12 PM
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Originally Posted by wschruba
1) Without knowing the exact model of fork, everyone here will be guessing what you need to do.

2) If it's been leaking oil, it likely needs to be pulled apart completely to be serviced (re-fill the oil/replace damaged seals).
1) my fork's model is marzocchi 2005-exr

2) yes there is leaking oil, the fork filled with oil and the seals seems it's ok !
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Old 01-15-17, 04:13 PM
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Originally Posted by sch
Drawing is a bit small but a google on 'foot nut on ATB forks' brought up several threads showing others have
had this problem with various solutions. https://www.google.com/webhp?sourcei...ut+on+ATB+fork
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Old 01-15-17, 04:18 PM
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Originally Posted by wesmamyke
My old Marzocchi fork had that problem sometimes. IIRC the solution was to compress the fork as much as possible while to tightening the nut.

It's also super easy to strip out and one of those things you actually have to pay attention to the torque value on. I'd see if you can back it off first and make sure the threads on both pieces look okay.
thank you so much for your help
i think you have the best solution, because my fork is marzocchi 2005-exr, so kindly explain me how to do what you said above step by step then i will apply it
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Old 01-15-17, 06:47 PM
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From previous posts on forums, I've read that a air/impact wrench is sometimes needed to get those spinning foot nuts off Marzocchi forks.
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Old 01-16-17, 12:33 PM
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Guys, i've notice when the fork full of air "foot nut unit" becomes some hardness to tighten but it's still spin and spin.
And when the fork is empty of air, the "foot nut unit" spin and spin easily and you can do it by your hand
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Old 01-16-17, 03:43 PM
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Yes, it is spinning less, because you've pressurized the cartridge, but it's still not secured by anything. This is a fairly common occurrence with suspension forks of that design, since nothing precludes the cartridge from turning inside the fork leg, other than the friction of any seals that extend to the inner walls of the stanchions. There is typically a close fit to the internals that prevents the spinning, such that they need to be bumped up (and into the stanchions) with a rubber mallet to the [loosened] foot nut.

Basically, your specific problem can be solved in several ways, and it's probably going to require that you do some kind of service to the fork, whether you want to or not. The absolute first step is going to be purging the air from the fork entirely, regardless of which method(s) you use. Depress/open the valve, and put your full weight on the handlebars/fork crown (if it isn't mounted on a bike). Now, you can:
  • Secure the fork arch to the crown (zip ties are useful here, one on each side
  • Attempt to tighten the foot nut, hoping the friction of the cartridge on the top cap will hold it in place, well enough

Bear in mind, you say you don't need to service the fork, but the lowers tend to need at least some oil, and it tends not to be much, at all. Any leakage is bad.

I'm always loathe to say this to someone, but it sounds like you might be in over your head a bit. Are there any local shops around you who work on suspension (even a motorcycle shop)? One expert actually looking at your fork is worth a thousand responses, to paraphrase...
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Old 01-16-17, 04:51 PM
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Originally Posted by wschruba
Yes, it is spinning less, because you've pressurized the cartridge, but it's still not secured by anything. This is a fairly common occurrence with suspension forks of that design, since nothing precludes the cartridge from turning inside the fork leg, other than the friction of any seals that extend to the inner walls of the stanchions. There is typically a close fit to the internals that prevents the spinning, such that they need to be bumped up (and into the stanchions) with a rubber mallet to the [loosened] foot nut.

Basically, your specific problem can be solved in several ways, and it's probably going to require that you do some kind of service to the fork, whether you want to or not. The absolute first step is going to be purging the air from the fork entirely, regardless of which method(s) you use. Depress/open the valve, and put your full weight on the handlebars/fork crown (if it isn't mounted on a bike). Now, you can:
  • Secure the fork arch to the crown (zip ties are useful here, one on each side
  • Attempt to tighten the foot nut, hoping the friction of the cartridge on the top cap will hold it in place, well enough

Bear in mind, you say you don't need to service the fork, but the lowers tend to need at least some oil, and it tends not to be much, at all. Any leakage is bad.

I'm always loathe to say this to someone, but it sounds like you might be in over your head a bit. Are there any local shops around you who work on suspension (even a motorcycle shop)? One expert actually looking at your fork is worth a thousand responses, to paraphrase...
i will try my best, unfortunately there isn't any local shop works on suspension, that's why i ask for your help
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Old 01-16-17, 05:09 PM
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For a very long time to come, the human brain and musculo-skeletal system will remain the best performing bicycle suspension system yet invented... this need not be the case, but it is the case, and IMO, the o.p.'s ultimate solution looks very much like a rigid fork to this writer... flame away...
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