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  1. #1
    Senior Member bhkyte's Avatar
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    advise please for services dual drive hub.

    Hello, would like some advice on servicing an old rather muddy sach 3X7 that is getting noisey. The bearing look dry to me. I have not taken apart the hub yet to service the bearings and woundering how hard will it be. The free wheel attcahment part of the hud bearings also have a signifcate amount of play.(the hub mount not the freewheel bearings) I have a spare sach 3X7 also.
    Last edited by bhkyte; 03-01-11 at 07:25 AM.
    Dual drive Mezzo (GOLD), Dual Drive Mezzo with bullbars (black), White Brompton thingy with Dahon Androes stem and bull bars. Birdie (old sytle) 7 speed. Downtube NS8.

  2. #2
    New usename ThorUSA brakemeister's Avatar
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    you should look under the service manuals from sram ...dualdrive .... basically the same
    thor

  3. #3
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    Make sure to get IGH specific grease before you start off It isn't overly hard process. Just make sure you have clean workspace where small parts won't get lost (those prawls CAN jump occasionally) and give yourself plenty of time. When disassembling, keep note of direction of parts... some parts can go in both ways and won't be noticeble until you try to shift gear with it (it works through 2 of them out of 3 even if you put it wrong... making you wonder...)
    Have fun

  4. #4
    Senior Member bhkyte's Avatar
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    Thanks ,but the only manuals I found online for the 3X7, (I have a3X9 manua), just said they need little maintainence!!

    lHad a go last night. I thought initially that the noise was the free wheel, It may well be. The reason I looked at the hub is due to lateral movement in the cones, I have took the intenals out ofthe hub greased the bearing and internals. Very easy but I can not tighten the cones enought to get rid of the play. Do I need to select a certain gear?

    Any ideas please? If I use extra washers between cone and locking bolts it will make the axle width too wide for the frame possibly?

    I have another hub. Once I get a freewheel for it I will get swop over the internals for now and get the other 3x7 hub working as a spare.
    Last edited by bhkyte; 03-03-11 at 02:01 PM.
    Dual drive Mezzo (GOLD), Dual Drive Mezzo with bullbars (black), White Brompton thingy with Dahon Androes stem and bull bars. Birdie (old sytle) 7 speed. Downtube NS8.

  5. #5
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  6. #6
    Senior Member bhkyte's Avatar
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    Thanks for PDF file.
    maybe this is the problem
    Page 48
    "Mount hub shell (4), obligatory with a
    slight counterclockwise turn"
    Have ordered a new free wheel for the spare hub. So I will place the spare interenal workings in place of the faulty hub to get the bike going again. Going to take to bike shop me thinks.............................? Or a slow proper refurbish when its been swopped over and therefore off the bike................ when I can be bothered.
    I will see how it goes. I don't understand why I can not get rid of the play, the cups seem fine the bearing OK.
    Last edited by bhkyte; 03-04-11 at 02:16 PM.
    Dual drive Mezzo (GOLD), Dual Drive Mezzo with bullbars (black), White Brompton thingy with Dahon Androes stem and bull bars. Birdie (old sytle) 7 speed. Downtube NS8.

  7. #7
    coprolite fietsbob's Avatar
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    So Its the 3 speed part , The IG section.. issue was just noise, not that it didn't shift?
    not Identical .. but I squirted in some Phil Tenacious oil thru the shift rod
    indicator chain hole in the right side of the axle of my AW3,
    unscrew the shift chain put some oil in there , then screwed it back together .

    for the hub's axle bearings , I just repacked them with grease,
    like I would do with any Ball Bearing hub.

  8. #8
    Senior Member bhkyte's Avatar
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    Yes it was shifting fine, I think the noise was the freewheel as it did not do it when pedalling. The play was why I looked at the hub. But having given it a quick regrease I can not tighten out the play. Bearing cups seem fine . I am a bit puzzled.
    Dual drive Mezzo (GOLD), Dual Drive Mezzo with bullbars (black), White Brompton thingy with Dahon Androes stem and bull bars. Birdie (old sytle) 7 speed. Downtube NS8.

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