Sachs/ Sram 7 speed gearhub. Timing the planetary shafts
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- Опубліковано 13 жов 2024
- Timing, or phasing of the planetary shafts is critical any time there are multiple counter shafts with stepped gearing. This video demonstrates timing the planetary shafts in a Sachs/Sram S7 gearhub.
Beauty. I understood the problem and the solution after the first two minutes of your video. This completely explains why I was missing the bottom two gears and why we broke one sun gear in the process. Thanks!
Yes, I have. I often replace cables and shifterboxes. It is always a problem at winter when cables are freezing.
Thanks for this. Today I was working on a five speed Pentasport and saw the little dots on the planetary gears. I figured they were timing marks but could not find any info on them except here.
Great video, wife's bike has one of these and I'll take it apart this weekend for some greasing.
you really helped me aut with this video :) im wondering why almost noone else is doing a professional video like yours. this days im working on a sram super 7 witch is similar to the spectro 7. i´ll try to clean it with gasoline used for cleaning purposes and then regrease it. do i really need some grease with teflon in it or can i use grease for bearings too? what would be your advice? have a good day, your Oliver D..
Yes. Actually, I think I should have said NLGI 00 semi fluid. If the hub does not have a coaster brake, you could safely lube it with a light oil such as ATF, but once you convert it to oil lube, you will need to replenish it regularly, like once a year.
If it has a coaster brake, I would stick with grease.
Thanks for the comment. For advice on greasing see comments below. Don't think teflon grease is necessary but it probably won't hurt anything.
Normally you use the following tool: SRAM Mounting Tool Super7/S7 Coaster Brake - Red
the blue one is for the old 5 speed Pentasport
Hello..can you answer me? My bike has a shifter with 7 speeds..but my hub of wheel has 3. Is it posible to buy other hub with adittional parts?
Just one word of caution. Regular wheel bearing grease is fine for the bearings, but far too viscous for the internal workings.
You need 0 grade semi fluid grease for that.
Are you referring to NLGI 0? I have to be specific with the local supply store, otherwise who knows what they'll get me...
Are all the ball-bearings 7/32"?, there's nothing in the SRAM Tech sheets. Much obliged.
Been a while since I had one of these hubs apart but 7/32 sounds right.
@@2wagondragon Thankyou!
I Can switch from 1,2,3,4 Easy but gear 5,6 and 7 gears are a bit broken. I have SRAM s7 Sachs Internal gear. Help plz. Can this video help?
I have the same problem as you...does anyone rebuild these in the usa?
Вероятно, у вас неправильно установлена длина троса при его замене. Должно быть 90мм от зажима троса в кликбоксе и до пластиковой гайки на оболочке троса. Далее обматываете тросом барабан кликбокса и взводите его пружину по часовой стрелке на один оборот.
Thanks for this! I'll add the link to this from my Sachs video.
On my bike I've got those gears. At the beginning they worked perfectly, but now. They just don't want to change... it's stuck on I don't know, maybe 4-th gear and it can't change... any advice how can I fix that ?
Hard to diagnose something like that on the internet, but I'd start with the simple stuff first. Make sure the click box is attached to the axle properly.
Check that shift cable housing is properly seated in the stops.
Like I said in the video, I know there is a tool for this, but what I demonstrated is that it is not necessary.
getting that tool, or any Sachs/Sram gearhub parts on this side of the Atlantic is pretty much impossible.
Very informative, thanks for sharing!
Do you deal with a lot of these S7 hubs?
No. If you need more ratio range, the 5 speed is a good option.
Спасибо !
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I checked, they really have to be phased/timed. But why?
Aren't the theeth evenly spaced?
If the theeth are evenly spaced how can it matter what position you put it in?
It shouldn't make any difference.
When there is a single sun gear and single planet pinions, it doesn't matter. When there are multiple sun gears with planet pinions of different size on the same shaft, if it were a single shaft, it wouldn't matter. But, when you introduce multiple pinion shafts all meshing with the sun gears of varying size, it matters a great deal.
If you closely inspect a planetary shaft, you will see the timing marks correspond with a point where the teeth on the a joining gears are aligned. This creates a common return point which is necessary in this case so the gearbox doesn't bind up as I demonstrated.
I'm sorry if that isn't clear enough, it's the best way I can think of to explain it.
Thanks for the video.
This guy would probably be your best bet.
Aaron's Bicycle Repair, Inc.
9988 15th AVE SW, Suite E
Seattle, Washington 98146
(206) 938-9795
Yes it is easier in Denmark where I have my bikeshop.
10x a lot!