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Old 09-11-12, 11:23 AM   #1
Dayton Duo
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Sachs Spectro 3x7 Internal Gear Hub

I have this hub on my BikeFriday tandem. I disassembled it to clean and re-grease it. In putting it back together, there is a round washer that is not in the schematic for the hub, so I am wondering where it goes. I have attached a picture of the parts that shows the hub disassembled and the washer in question is circled in red. I have also attached the schematic for the hub. If anyone can help me with the location, I would appreciate it.
I also have a question about lubrication during reassembly. I know I should grease the planetary gears, the mating surface inside the cup for the planetary gears, the retained bearings, and the gear on the axle. Phil's oil on the pawls. What do I do inside the hub shell to the surface the pawls will strike? Anything?
Thanks for your help.
Mike..
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File Type: jpg BF parts.jpg (59.8 KB, 20 views)
File Type: png Hub Schematic.png (26.8 KB, 18 views)
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Old 09-13-12, 06:43 AM   #2
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The older version of the 3X7 had a little washer, 14A:

http://www.karstilo.net/hpv/technik/...mal7/3x7_1.gif
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Old 09-13-12, 08:53 AM   #3
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My 3 speed IGH, an SA AW3, I grease the axle bearings,
on the rest a squirt of Phil Tenacious oil in the indicator chain hole in the axle,
occasionally, is apparently adequate..

Back in the day when there was a oil cup in the hub shell,
a light machine oil was recommended.

as it leaked out past the axle bearings they got lubricated..
so the grease just retains the oil in side a little longer..

Last edited by fietsbob; 09-13-12 at 08:58 AM.
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Old 09-13-12, 08:59 AM   #4
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Quote:
Originally Posted by Dayton Duo View Post
I have this hub on my BikeFriday tandem. I disassembled it to clean and re-grease it. In putting it back together, there is a round washer that is not in the schematic for the hub, so I am wondering where it goes. I have attached a picture of the parts that shows the hub disassembled and the washer in question is circled in red. I have also attached the schematic for the hub. If anyone can help me with the location, I would appreciate it.
I also have a question about lubrication during reassembly. I know I should grease the planetary gears, the mating surface inside the cup for the planetary gears, the retained bearings, and the gear on the axle. Phil's oil on the pawls. What do I do inside the hub shell to the surface the pawls will strike? Anything?
Thanks for your help.
Mike..
Not to be finicky, but have you asked Bike Friday? They're very knowledgeable about the Sachs/SRAM hubs, and have spare parts that SRAM doesn't supply.
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Old 09-13-12, 10:10 AM   #5
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Thanks for everyone's thoughts.
tcs, I found the same drawing. Interesting that the shell is different, but the internals the same. I was thinking of trying that arrangement.
Jeff, I have been in contact with Bike Friday. They are baffled as they just took a hub apart and no washer.
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Old 09-13-12, 12:08 PM   #6
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Thanks for everyone's thoughts.
tcs, I found the same drawing. Interesting that the shell is different, but the internals the same. I was thinking of trying that arrangement.
Jeff, I have been in contact with Bike Friday. They are baffled as they just took a hub apart and no washer.
Hmmmm... interesting. Good of them to actually disassemble a hub and actually look, instead of relying on the diagram.

Is it possible it was under one of the locknuts to adjust the over-locknut spacing? I can't see it being added internally.

(FWIW: back when I was learning to overhaul 3-speeds [Schwinn School, 1980], we'd take them apart in order and keep the parts in roughly the proper relationship. For the final exam, we'd take 3 different hubs apart at the same time. Then the instructor would sweep the parts into a bucket and we'd go to lunch. After lunch, we had to reassemble the hubs. )
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Old 09-13-12, 06:15 PM   #7
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I don't believe so since I took a photo of the first few steps of dis assembly before the camera batteries died. I found an exploded diagram of a hub with the exact parts I have, only a different shell. Maybe mine was during a transition. Working a few other angles, if I come up with an answer, I'll post here.
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Old 09-14-12, 04:19 AM   #8
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Originally Posted by Jeff Wills View Post
(FWIW: back when I was learning to overhaul 3-speeds [Schwinn School, 1980], we'd take them apart in order and keep the parts in roughly the proper relationship. For the final exam, we'd take 3 different hubs apart at the same time. Then the instructor would sweep the parts into a bucket and we'd go to lunch. After lunch, we had to reassemble the hubs. )
Harsh but fair

A mate once handed me a box of springs and other assorted small parts, said it was fishing reel and asked for my help.

Never worked on one before (or since) but an hour later I handed him a working reel
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Old 05-09-15, 10:58 AM   #9
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Hallo Dayton - I know it's about eight years later, but I just repacked my Sachs Spektro 3x7 hub (not quite sure which version, suspect older, with possibly some newer spares), and I found your photo super helpful. Also the schematic on karstilo.net, near the bottom of the page.

The link may not work, so I'm attaching it also.



From my disassembly today, it seems that 14a is your spare washer. It doesn't show on later schematics, possibly because these leave some parts unexploded, e.g. the planet cage (14) and the ring gear (16).

I couldn't get the circlip (10) open, so my planet cage stayed unopened. But when I was cleaning it, I saw your spare washer snugly behind the three planet gears, against the "floor" of the planet cage. It forms a spacer between the planet cage "floor" and the teeth of the planet gears (and also the teeth of the sun gear on the axle). I think your "mating surface inside the cup for the planetary gears" is what I call the "floor" of the planet cage.

Following advice on SheldonBrown.com (long may the site endure!), I used white lithium grease on all the internal gears (thinner), tenacious (chainsaw!) oil on the pawls and also on the inside of the hub (the toothy bits, where the pawls grip and slip), then my favourite trippy-looking purple grease everywhere else for waterproofing. What a sweet sound it now makes - almost none. ^_^

Off to go mount it in my older model Hase Pino1. Odd that the Sachs 3x7 came with the Pino (semi-recumbent tandem) - all the manuals for any hub-gear I've seen so far (and I've seen a few in the past week or two) seem to say "not for tandem bicycles".

Cheers
Mark von Delft
Edinburgh
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File Type: gif 3x7_1.gif (66.3 KB, 4 views)

Last edited by vondelma; 05-14-15 at 01:36 AM.
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