Please see comments below expanding on John's advice
At 05:38 PM 12/7/2017, John Thurston wrote:
>On 12/7/2017 12:08 PM, dirk b wrote:
>>My Sat-R-Day has one. So far so good. I know bf can
>>rebuild. (Or at least they could when Tim Link was there.
>>Not sure now. Keep it oiled and away you go.
>I'm sure Bike Friday can do a rebuild.
>Another well-known provider of overhaul service is Aaron's Bicycle in Seattle:
>
http://www.rideyourbike.com/internalgears.shtml
>
>As you say, "keep it oiled and away you go." The planetary gears
>should run for years and years.
>
>My experience with the Sachs is the the weak spots are not the
>planetary gears, but the wheel bearings. The bearings are not well
>sealed (by the standards of this decade),
-- or by the standard of the classic Sturmey-Archer hubs, which also
had an oil port. One issue these days is that hub manufacturers
expect bicyclists not to do maintenance, and will get freaked out if
a hub leaks oil, so all of the internal-gear hubs except the Rohloff
and the Shimano Alfine 11-speed are grease-lubricated. Aaron has some
examples here
http://www.rideyourbike.com/sramIGH.shtml and here:
http://www.rideyourbike.com/shimanoIGH.shtml
>and hub disassembly is required to grease the bearing balls and
>races. On my Sachs, I do this every couple of years.
That is good, but any Sachs/SRAM hub which uses a pullchain (e.g.,
the 3 x 7) or clickbox (e.g., DualDrive) can also be oiled through
the right end of the axle after removing the pullchain, or clickbox
and shifter rods. Oil weeping out through the bearings is messy but
it cleans them. Phil Wood oil is tacky and doesn't weep as fast as
others. Lighter oil is advisable in extreme cold. Coaster-brake hubs
are more picky about lubrication due to heat issues and require
high-temperature grease, one more reason I avoid them.
Aaron recommends a complete relubrication even with a *new* hub.
Often the factory lubrication is inadequate. And with time, the
grease accumulates wear particles which further accelerate wear.
Above all, avoid submersing the hub in water. Rust and grit will eat
the internals.
General info on IG hubs, with links to info on specific hubs and on
lubrication, is here:
http://sheldonbrown.com/internal-gears.html
>If you aren't afraid to get your hands dirty, this repack is very
>similar to any other cup-and-cone repack. Work only from the *left*
>side and you'll find only a single lock nut and bearing cone stand
>between you and all the balls and races. When the left side locknut
>and cone are removed, the entire 3-speed unit slips out the right
>side of the hub shell. Ignore the complicated bit in the center, and
>clean/grease the balls and races you see. Slip the core back into
>the hub shell from the right, and reinstall the cone and locknut on the left.
>
>If you don't want to get your hands dirty, any LBS (even those
>afraid of internally geared hubs) should be able to handle this
>task. I suggest telling them:
> A) Don't misplace any of the axle nuts or washers
> B) Don't touch the cassette or right-hand nuts
> C) Don't do anything to the planetary core
> D) Perform bearing adjustment *only on the left side*
The mechanic also should be careful not to invert a bearing retainer.
The hub will have a lot of friction and destroy itself eventually if
this is done. I've seen this.
>I've never been inside a Sachs/SRAM DualDrive, but my read of the
>exploded parts-diagram leads me to think it can be handled exactly
>the same way. Work from the left. Ignore the core.
>
>I've yet to be inside my Sturmey F30 hub, but my read of the
>parts-diagram leads me think it can *not* be handled in this simple way.
I don't see why not. Why don't you think so? Certainly, though it can
be oiled through the right end of the axle. F30 info:
http://www.sturmey-archer.com/en/products/detail/cs-rk3-black
>--
>John Thurston
>Juneau, Alaska
John S. Allen
jsallen *at*
bikexprt.com
http://bikexprt.com
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