2wheels2

Anyone know ... can these shifters be dis-assembled or is it a factory press-together assembly?
Adjustment is kind of sticky, and was hoping to clean them up and maybe re-grease or oil them better.
thanks

Bianchigirll 

I don't think they are supposed to come apart. You might try just spraying lots of triflo or wd40 into and see if smooths out

Frkl

Not sure what exactly you have there, but shimano shifters can usually come apart, in my experience. The dt shifters are more intuitive, the mtb thumbies have unexpected hidden screws.

Dura ace 7400 comes apart nicely for maintenance :

https://www.velobase.com/ViewCompone...6b989&Enum=104

XT and deore thumbies do too.

More recently dura ace 9 bar end shifters come apart too.

Frkl

Just be sure to keep all the bits in order, there are an unexpectedly large number of parts in a "simple" dt shifter. Also, l and r are very different in my experience.

Or find an exploded diagram at

Si.shimano.com

delbiker1 

They can be dis-assembled, but the one in the picture looks to have a lot of wear. A real possibility a part will break. I would try flushing and re- lubing first. I took one apart, once. The index washer, whatever it’s called snapped in two. That was an 8 Speed Shimano. No fixing it.

rccardr 

Pls post a pic of the other side.

2wheels2

Some more background on it ...
its from a 6 speed bike C1987. The group is apparently called "Light Action" which was at the lower end of the range, and therefore maybe more likely to be a simple pressed-assembly.
The actual shifting action is really very nice with crisp clicks. The adjustment I was working with was for the setting of Friction vs Indexed. Tried clearing it out with WD-40 and letting it drain out before letting some light oil soak in. Not sure there was any change.
Back side looks like the picture below. No C-clips, screws or other that I have seen. If it can't be dis-assembled, I'll just leave it, as some have mentioned, parts can get broken or lost. No sense creating more work.

Bianchigirll 

I don't think that one comes apart. The Dura Ace and others don't really come apart either. I believe there were supposed to have a replacable "pod" or whatever but small parts were almost non existent

edit. this page from the ‘96 Quality Bicycle Parts catalog shows only Dura Ace pods but as I said I don’t recall really seeing any

2wheels2

Thanks, Bianchigirll! I think that seals it. Will clean up the exteriors, then back on the bike.

Hondo6

If those shifters were indeed part of Shimano's Light Action SIS line, they're likely the SL-S434. These were made in both 6- and 7-speed variants.

Unfortunately, based on Shimano's EV for the SL-S434 it appears that they are not designed to be rebuildable - at least, not by mere mortals end users. The levers come off easily, but unlike the Dura Ace 7400 series the shift internals appear to be permanently pressed/bonded into the levers.

The same is true for many if not most of Shimano's 7-speed and later SIS downtube shift levers (though I can't say with certainty that all later Shimano SIS downtube shifter sets are built this way). The Dura Ace 7400 series is one of the few I know of that have replaceable pods; perhaps some of the early 600/Ultegra downtube shifters did as well.

On the plus side, "that auction site" does appear to have a fair number of Shimano 6-speed SIS downtube shifters available if you need a replacement. You might also try posting a comment in the "ISO . . . " thread that's a "sticky" at the top of the C&V forum.

Best of luck.