Help to repair my Spectro S7
I have a Dutch bike but live in Italy, therefore having a problem to my Spectro S7 with Drum Brake equals that I have to repair it myself.
Having said that, I dismantled the hub completely, found the problem, fixed it (at least I believed so ) re-assembled again.
I can shift on 4, 5, 6, and 7 gear, I can also go down to 3,2,1, but feel no difference.
Basically, 4,5,6,7 work fine but going down from 4th gear to 3rd, 2nd and 1st there is no change.
The bike is from 1999 but I found differences between the technical manual 1999 and my hub.
For instance, if you look at the picture enclosed from the 1999 spare parts:
In my hub I found P/N 64 broken into pieces, I recognized it could have been a sort of "washer" set into the gear ring sprocket and where the spring 65 was pushing (also because all the pieces where there). I got the spare part (which is supplied as a set with all the springs), but does not look like the one shown in the drawing, therefore I did not use it.
In addition, between P/N 34 and P/N 35 I have bearings and above P/N 35 there is a dust cover, but this is omitted in the drawing.
Now, I don't know if the "washer" I did not replace can be the reason of my problem, but I doubt it.
I am looking for some advise at what to look for, just to limit the range and focus on a possible area where the problem is. I don't even know if the issue could be in the twistgrip for instance.
I already matched up the arrow marks with the adjusting screw.
I hope somebody can help me.
Here is one thing to check. With the click box off, ensure the inner shift rod moves freely in and out. It should offer a fair bit of spring resistance going in and spring right back out when you release it. If it does not move freely, check to see if the rod is bent and ensure that it is well lubed.
Originally Posted by Metallo
Did you remove the sun gears from the axle during dissassembly? if so, it is cruicial that the bevels be oriented correctly going back together.
Thanks for your suggestions.
I didn't get so far to the sun gears, therefore no change there.
I checked the rod and it looks OK.
I dismantled the whole thing again and changed the three springs I got in the spare part set, that is, n° 62, 63 and 65. I re-assembled everything and now it goes from 7 to 3 smoothly, from 3 to 2 need a bit to catch it, from 2 to 1 nothing occurs.
This means that the new springs improved the situation, but it is not enough to shift to 1.
Is there anything else I could do in your opinion?
Any other fine tuning I should look at in addition to the adjusting screw?
It looks strange to me that it can get from 7 to 3 perfectly, eventually to 2 and not to 1, it looks like this is a fine tuning problem but cannot see any other register in addition to the screw in the click box.
That washer which broke into pieces, could have something to do with it. I am not S7 specialist, but since it has a clickbox that moves the central axle in and out, the amount of "in-ness" of the axle probably determines the speed. The washer might act as a spacer in some way. Maybe you should look for a similar washer from some good hardware store. Do you still have the pieces of the original one? Those could help you in sizing the replacement.
I know you can have your shimano hub gears serviced, maybe the situation is the same with SRAM?
With my S7, the part to break was 56. Finnish cold winter makes plastic brittle.
Well, this morning I did add the washer they supplied in the "Set A", but the original one was different, the problem is that it is broken to smithereens, therefore is not possible to see the size or the shape.
However, I am sure it is thicker than the one they supply today, therefore you may be right, perhaps is that 1 or 2 mm missing to the rod.
I will ask SRAM because for me is very strange they do not have that washer in their drawing, obviously today they use a new one, but the bike is from 1999 and the old washer should be into the manual of 1999.
Thank you for your suggestion.
I spoke to SRAM and they said that being from 1999 is possible that they changed the type of washer in the set they supply. They cannot hold in stock "old spares" otherwise it would be very expensive.
Originally Posted by Metallo
Result, I have no solution other than keep my gear hub as it is or change it all.
If only I could see how the old washer was made, I could try to find something similar
There are 2 possibilities: try to guess, looking from the pic and comparing to the "surviving" parts, the dimensions. You should be able to find a washer of similar size - but the question is the shape. I'd say, go to a better HW store and get several sizes and kinds, and start experimenting a bit.
Originally Posted by Metallo
Second possibility: that part has no relevance and your problem is something different, maybe the cable has not been dialed in correctly. But I guess you did this one right, by following SRAM's manual.
However, I find it totally and utterly ridoncolous that SRAM would make metal parts that would break like that. WTF did they make it of, rye bread? Honestly, I'm not impressed by their quality, after the plastic part in my S7 broke so quickly (after 5 months of usage). Say what you want about Shimano, but I have not had any problems with their hub gears.
Also, their statement that they're too 'Leet to stock "old" parts is pathetic. Fsck 'em.
I have also some problem in Sram/sachs S7 gear hub, I hope if anybody can guide me.. Actually, I forgot to tight coaster break nut and it during riding disappread and hub itself opened apart and stucked. Later on I repaired it with the help of helper at students' cycle workshop at Uni, but now 4,5,6 and 7 gears are working but 3,2,1 gears do not work or became difficult as 5,6 or 7. There is nothing missing or broken inside. Just bigger boll carrier was a bit de-shapped and with hand push again was good in shap and fit.
Can someone guide me? further how important is or not mounting tool to use on planetary gear carrier?
any guidance would greatly appriciated.