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  1. #1
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    Headset problem help

    I just installed a Shimano 600 HP 6400 headset. This is the one with balls and retainer. Everything works fine as long as I don't install the lower race dust cap. If I try to use the dust cap the final adjustment will be too loose or too tight. Any suggestions will be greatly appreciated.

  2. #2
    Senior Member chi-james's Avatar
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    maybe the bearing cages are oriented incorrectly? are both sets of bearings the same size?

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    Excellent thought but the cages are oriented correctly. Both sets of bearings are the same size. Thank you.
    Quote Originally Posted by chi-james View Post
    maybe the bearing cages are oriented incorrectly? are both sets of bearings the same size?

  4. #4
    Senior Member bikeman715's Avatar
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    the dust cap will cost a little drag as any seal does .
    bikeman715

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    Quote Originally Posted by bikeman715 View Post
    the dust cap will cost a little drag as any seal does .
    I agree with you but this is more than a little drag. If I adjust the headset to eliminate looseness the drag is really excessive. Perhaps using it this way for a period of time will eventually eliminate the drag. What do you think?

  6. #6
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    Those seal rings had to be installed oriented the proper way. There is a little lip on the outer edge and, while i don't remember which way it had to face, only one way was correct. Try turning the seal over and see if it helps.

    BTW, I had that exact headset on a '92 Trek 1420 as a replacement for the OEM Tange which wore out and brinelled in 4000, miles. The HP-6400 lasted almost 20,000 miles.

  7. #7
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    Quote Originally Posted by HillRider View Post
    Those seal rings had to be installed oriented the proper way. There is a little lip on the outer edge and, while i don't remember which way it had to face, only one way was correct. Try turning the seal over and see if it helps.

    BTW, I had that exact headset on a '92 Trek 1420 as a replacement for the OEM Tange which wore out and brinelled in 4000, miles. The HP-6400 lasted almost 20,000 miles.
    Well, that's about the only solution I can think of also. Thank you.

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