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Possible to rebuild a DT440 rear hub without specialist tools?

Discussion in 'Downhill & Freeride' started by big-ted, May 11, 2013.

  1. big-ted

    big-ted Danced with A, attacked by C, fired by D.

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    As title. The user's manual makes reference to several specialist tools. Most of these look like they could be substituted for appropriately-sized sockets but it looks as though one needs to remove the star-ratchet, which seems like there's no getting around the need for the appropriate tool. I need to replace all the bearings. Anyone offer any advice?
     

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  2. gemini2k

    gemini2k Turbo Monkey

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    I too am interested. I have to replace the bearings on my rear 440 too.
     
    #2 -   May 11, 2013
    Last edited: May 11, 2013
  3. marshalolson

    marshalolson Turbo Monkey

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    super easy.

    rubber mallet a few sockets, and a bolt/nut/washers to press everything back together.
     
  4. big-ted

    big-ted Danced with A, attacked by C, fired by D.

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  5. big-ted

    big-ted Danced with A, attacked by C, fired by D.

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    ...and another question! The diagram shows just the two bearings. Is there really no bearings in the freehub to worry about?!

    440rear_hub.jpg
     
  6. wood booger

    wood booger Monkey

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    There are two bearings in the freehub body as well.
     
  7. big-ted

    big-ted Danced with A, attacked by C, fired by D.

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    Same dimensions/part no. as the hub bearings?
     
  8. Udi

    Udi RM Chief Ornithologist: “I Brake for Birds”

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    It's been a long time since I owned these, but if I remember correctly you can't remove the drive-side main hub bearing without removing part #5, which requires a special tool. It also takes a lot of force to unscrew because it tightens in the drive direction. It's a terrible design.

    However this was on a Hugi FR, I never had to change bearings on the 440 I had. I am not sure what marshalolson did, but unless they changed the design (which would be good), that bearing is not coming out any other way.

    A friend of mine made me the tool by welding a metal extension (with wrench flat) to an old star ratchet.
     
  9. al-irl

    al-irl Turbo Monkey

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    even with the specialist tool it can be difficult to get part #5 out. As you pedal its constantly being tightened. Ive had the special tool disintegrate while trying to remove part #5. So have had to just leave that bearing and replace the rest.
     
  10. mattmatt86

    mattmatt86 Turbo Monkey

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    I rebuilt my 440s last year, only thing I couldn't do at home was remove the ring drive piece everyone is talking about. I took it to a local shop and they charged 20 bucks to remove it and put it back in after I installed new bearings. I bought a set of Ceramic Bearings on Ebay for 70 bucks for both the front and rear hubs.
     
  11. Full Trucker

    Full Trucker Frikkin newb!!!

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    This thread comes at an appropriate time, as I need to replace the axle in a DT 350 hub from an old set of E1750 wheels. Cool. Also Marshal... d'ya think a Park headset press (this one) would work as described below?

     
  12. marshalolson

    marshalolson Turbo Monkey

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    gha. good point, i was mistakenly thinking i pressed the drive side out the disc side - but you are correct, you need a ring drive tool. the shop i worked at did the same thing: old star ratchet tack-welded to an extension.

    however a little pb-catalyst and a long cheater bar really helps get that sucker out of the hubshell.
     
  13. big-ted

    big-ted Danced with A, attacked by C, fired by D.

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    Ugh. Kind of what I feared. I have to say, I'm not enthralled with this hub. The standard ratchet doesn't give fantastic engagement, the bearings have never run particularly smoothly, they require specialist tools to work on, and they're bloody expensive to boot. Just a shame they came with the stock build on my bike.
     
  14. big-ted

    big-ted Danced with A, attacked by C, fired by D.

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  15. Da Peach

    Da Peach Outwitted by a rodent

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    Try it now!
     
  16. big-ted

    big-ted Danced with A, attacked by C, fired by D.

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    I'm surprised it took so long. You're slacking... :P
     
  17. kidwoo

    kidwoo Celebrating No-Pants Day

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    It's a bltch.

    You need the tools.
     
  18. Huck Banzai

    Huck Banzai Turbo Monkey

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    Yell at it, then kick it. Also, make sure you're drunk first. (And make sure you have plenty of band aids handy.)
     
  19. big-ted

    big-ted Danced with A, attacked by C, fired by D.

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    Sweet. Hopefully this thread gets more views now the peanut gallery have arrived! :)

    FYI, we've established this ain't happening without the tools. I just need to know the bearing sizes in the freehub.
     
  20. gemini2k

    gemini2k Turbo Monkey

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    I just ordered the tools yesterday. I'll go at mine sometime this week or next and post my findings.
     
  21. kidwoo

    kidwoo Celebrating No-Pants Day

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    Just be sure you get the tools.

    There are some specialized tools you're going to need.

    I don't think it's possible without the right tools.




    For those thinking you need new bearings based on them dragging, the end caps on the rotor side sometimes just get pressed in to far on the axle. I was thinking the same thing last night (because I HAVE crushed an axle in one of these before). I just pulled the cap off and reinstalled it and it's all freewheelin n' shlt now.
     
  22. 'size

    'size Turbo Monkey

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  23. Dogboy

    Dogboy Turbo Monkey

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    The bearing number is on the seals.
     
  24. Udi

    Udi RM Chief Ornithologist: “I Brake for Birds”

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    I think you have all the tools you need now, right here in this thread.
     
  25. kidwoo

    kidwoo Celebrating No-Pants Day

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    Might need some more tools.
     
  26. Full Trucker

    Full Trucker Frikkin newb!!!

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    Well crap guys... it turns out I'm definitely going to need some tools.
     
  27. big-ted

    big-ted Danced with A, attacked by C, fired by D.

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    So, on the off-chance anyone still cares, it is indeed two 6902rs bearings in the freehub. I guess that's a kind of a redeeming feature in that both front and rear hubs use 6902 (or 61902 in North American codes) throughout...
     
    #27 -   May 16, 2013
    Last edited: May 16, 2013
  28. Da Peach

    Da Peach Outwitted by a rodent

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    I don't think kayaks have bearings... You must have bought the wrong tools...
     
  29. big-ted

    big-ted Danced with A, attacked by C, fired by D.

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    :think: