Command post issue- Mtbr.com
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  1. #1
    mxh
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    Command post issue

    Hoping there's some Specialized Command Post experts on here that may be able to help.

    My 2015 Command post began losing air pressure a while ago. At first it would last a few rides before needing topping up, but got to the point where I was having to top it up mid ride.

    I stripped it down and regreased everything, put it back together and pumped it up - it held the pressure whilst not being ridden (was OK for days after being pumped up), but half way through the next ride the air had all gone.

    So then I bought a service kit, replaced all the seals etc and put it back together. All seemed to work OK but again it held pressure OK in the garage, but out on a ride it loses air.

    I've checked that there's no air leaking from the post after rebuilding (by putting it in a bucket of water) and the fact that it stays pressurized for days on end suggests that it's not a faulty valve etc.

    I've also tried activating it underwater, and that doesn't show any leaks.

    So how come this thing holds pressure OK through all my testing etc. But half way through a ride the air is all gone? Any ideas?

  2. #2
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    You may have a scratch on the post???
    Pressure rises when slammed, have you tried storing it slammed to verify pressure?
    The Schrader valve isnt leaking When slammed?
    Just to be clear, your not riding up 3000ft climb.
    You put a bit of grease on the top of the body so that when the cap threads on, it has some grease to help seal there?
    You used slick honey for grease and dont exceed the recommended pressures?
    You used a strap wrench to tighten and remove and the cap isnt distorted?

  3. #3
    mxh
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    Quote Originally Posted by Fuse6F View Post
    You may have a scratch on the post???
    I've inspected and I can't see anything

    Quote Originally Posted by Fuse6F View Post
    Pressure rises when slammed, have you tried storing it slammed to verify pressure?
    The Schrader valve isnt leaking When slammed?
    Yes, stored it for several days slammed, and it worked fine

    Quote Originally Posted by Fuse6F View Post
    Just to be clear, your not riding up 3000ft climb.
    No

    Quote Originally Posted by Fuse6F View Post
    You put a bit of grease on the top of the body so that when the cap threads on, it has some grease to help seal there?
    Yep, followed the online servicing video and greased the thread thoroughly

    Quote Originally Posted by Fuse6F View Post
    You used slick honey for grease and dont exceed the recommended pressures?
    I used a teflon based grease. I don't exceed the pressure when using the post, but as a test I did pump it up to 50psi and put it in the swimming pool. No evidence of any leaks.

    Quote Originally Posted by Fuse6F View Post
    You used a strap wrench to tighten and remove and the cap isnt distorted?
    Initially I just did it 'hand tight', but after it lost pressure the first time I redid it with a strap wrench. The cap all looks straight,

    The only thing I can think of is that the upper post is worn, and each time I activate the seatpost it's letting a small amount of air escape. But I can't see any evidence of that.

    I've now tried putting the old main seal in the cap, in addition to the new one. Can't do any harm, but whether it helps is yet to be seen.

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