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  1. #1
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    Dumpster Torpedo 3 speed

    Hi all,

    On my ride back from work yesterday I picked an old twisted wheel lying on the roadside. It has a 3 speed Sach Torpedo hub with coaster brake.

    I cut the spokes and discarded the rim and if the hub is in working order I plan to re-use it and convert an old utility bike to three speed.

    When I've managed to disassemble and clean the internals, what type of lubricant and how much of it should I use to repack the hub?

    Also, it has a 21-tooth sprocket. Can I rig it on a small wheel or should I stick to a 650 or 700 rim?

    I'm not very knowledgeable of gearing ratios and such so any help would be welcome.

    Thanks again.

  2. #2
    Member jgwilliams's Avatar
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    I'm not familiar with the Sachs hub, but the old Sturmey Archer 3-speed used to be happy with 3-in-1 - that's a sort of general household lubricant, if you don't have it there. The hubs use a planetary gear system (like an auto gearbox on a car) which requires very little maintenance. My understanding is that the ratios themselves tend not to change, so if you want to use a small wheel you need a big chainring, but I might be mistaken about that.

  3. #3
    Bike Evangelist Boss Hogg's Avatar
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    The wrong lubricant is better than no lube!!! What kind of stuff came out of it,oil, grease? I would put it back together with somthing similar, considering it is old, I would use basic oils/grease since our fancy high tech stuff wasn't around when it was built

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    Quote Originally Posted by Boss Hogg
    The wrong lubricant is better than no lube!!! What kind of stuff came out of it,oil, grease? I would put it back together with somthing similar, considering it is old, I would use basic oils/grease since our fancy high tech stuff wasn't around when it was built
    There's gunky black grease (not much) on the planet gears and coaster brake internals. The pawls and springs are clean and without anyting on them.

    I don't think I can use oil since it would flow out of the brake side, but I may be wrong.

    I have a can of general purpose grease I think I'm going to use on it.

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    Hi all,

    What are the gearing ratios in a Torpedo 3 speed hub?

  6. #6
    Senior Member DieselDan's Avatar
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    I've seen 30 weight motor oil or industial tool/machine oil used in internal gear rear hubs.
    Bikes use brakes to stop.

    If your bike has breaks, don't ride it.

  7. #7
    Senior Member randya's Avatar
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    Don't over lube it. The bearings should be lubed with a heavier grease, the internal gears with a light oil, the coaster brake drum and shoes with something like temperature-resistant 30 weight motor oil.

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    Quote Originally Posted by Desk Rider
    Hi all,

    On my ride back from work yesterday I picked an old twisted wheel lying on the roadside. It has a 3 speed Sach Torpedo hub with coaster brake.

    I cut the spokes and discarded the rim and if the hub is in working order I plan to re-use it and convert an old utility bike to three speed.

    When I've managed to disassemble and clean the internals, what type of lubricant and how much of it should I use to repack the hub?

    Also, it has a 21-tooth sprocket. Can I rig it on a small wheel or should I stick to a 650 or 700 rim?

    I'm not very knowledgeable of gearing ratios and such so any help would be welcome.

    Thanks again.
    Hi, desk rider. I just came across your thread - I know it's been a year, but are you still needing info on that Sachs hub? I just purchased one on E-bay and it included an owners manula of sorts with lube info. Some of the oils and greases listed had funny names - perhaps they are European brands. Let me know

  9. #9
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    Quote Originally Posted by bikemeister
    Hi, desk rider. I just came across your thread - I know it's been a year, but are you still needing info on that Sachs hub? I just purchased one on E-bay and it included an owners manula of sorts with lube info. Some of the oils and greases listed had funny names - perhaps they are European brands. Let me know
    Bikemeister,

    Thanks for your reply. I've been busy building a recumbent the whole time.

    After disassembling and cleaning that torpedo I sprayed all of the internal components with light lube and put the hub back together without tightening anything. It's now in safe storage, waiting for me to turn my attention to it again.

    It would be great if you could send me info on the lubes and other thechnical details I may be needing.

    I'll also need to purchase a shift lever/grip. I'm not sure any sachs three-speed shifter can do, especially if the shifter was desinged for a front derailer.

    DR

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    I use Sturmey Archer internal gear hubs and the recommendatio is to use grease on the bearings only. Use a light oil for the internals. Something like a 10-20 wt oil works for me, 3-4 drops every few rides. There should be some sort of plug on the shell to allow you to add oil.

  11. #11
    My bikes became Vintage OLDYELLR's Avatar
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    I just checked my Sutherland's 3rd Edition and it says grease for all the coaster brakes. Planetary hub gears use grease for the bearings and light oil for the gears, just like bits says.

    Oh, and I wouldn't use any fancy moly or EP grease for the brake because it's metal to metal and these things were designed for just ordinary grease generations ago.
    1981 Nishiki Ultimate
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    "index shifters = frets on a fiddle"

  12. #12
    jcm
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    10-20 motor oil every once in a while. Outers *** Oil works very well. 30wt is a little heavy. Use 2 tsp when you initially re-assemble. Bearing grease the bearings only. Don't grease the pawls or gears - too sticky. Treat it pretty much like an SA hub.

    EDIT: There is nothing wrong in using a thinner oil, it just runs out faster. But a heavier oil can be a detriment to free movement of the pawls in cold weather. Go medium.

  13. #13
    Chrome Freak Rabid Koala's Avatar
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    I'd probably not use 3 in1 oil as it is vegetable based and gets really gummy.

  14. #14
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    jcm
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    frameteam2003: Vielen danke. That site goes to "my Favorites"

  16. #16
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    Quote Originally Posted by bitsnpieces1
    I use Sturmey Archer internal gear hubs and the recommendatio is to use grease on the bearings only. Use a light oil for the internals. Something like a 10-20 wt oil works for me, 3-4 drops every few rides. There should be some sort of plug on the shell to allow you to add oil.
    It does not have a capped filler on the outside shell, unlike Sturmey Archers. I suppose that it would take some disassembling for re-oiling, as I don't see how I can drop some oil inside.

    DR

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