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9sp Shift Lever Problem (Deore LX SL-M570 )

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9sp Shift Lever Problem (Deore LX SL-M570 )

Old 11-13-11, 04:25 PM
  #1  
SEAtrain
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9sp Shift Lever Problem (Deore LX SL-M570 )

I have a problematic right shift lever on my circa 2002 Specialized FS mtb.

When shifting to a lower gear, sometimes the lever doesn't catch and I can't shift without extending the lever to its extreme reach. I can feel the lever contacting an internal gear where it should, but it misses and finally engages at the end its reach (and the end of my thumb's reach). It's about 50/50. Sometimes it engages properly and sometimes it doesn't.

Is there any way to repair the lever? or Do I simply need to replace it?

If it comes down to replacing parts, I can see a few options. I'm thinking the M770 shifters are the way to go.
Deore SLM590 75.99
Deore XT SL M770 105.41
Shimano XTR SL-M970 199.99

Any guidance is appreciated.
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Old 11-13-11, 05:51 PM
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Is this defiantly an issue with the shifter? and nothing to do with the cabling for the RD?

For repair, there isn't too much that can be done as effectively they are a sealed unit https://techdocs.shimano.com/media/te...9830609208.pdf the suggestion given on BF mainly is to flush them out with WD40 or similar.

For the replacements you have suggested, the XT 770's are great, there are also SLX (M660) which fit in between the Deore and XT which are good as well.
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Old 11-13-11, 05:55 PM
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have you tried the good old solvent blast?
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Old 11-13-11, 08:16 PM
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Ah, yes, I'll blast it with solvent. I see there is a rubber like access port. Open than up and blast away, I presume? Do I re-grease after?

Cables appear to be OK but I can't say I've completely eliminate problems here. No excessive slack, at least.
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Old 11-13-11, 09:30 PM
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Originally Posted by SEAtrain View Post
Ah, yes, I'll blast it with solvent. I see there is a rubber like access port. Open than up and blast away, I presume? Do I re-grease after?

Cables appear to be OK but I can't say I've completely eliminate problems here. No excessive slack, at least.
Remove the access port (it's a plastic screw that allows removal of the cable) and blast away. No grease needed afterward. WD-40 works OK, but I prefer something petroleum-based for lubrication. Look around your local hardware store.

This is a very, very common problem with Shimano shifters.
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Old 11-14-11, 09:15 AM
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Cool, I'll give it a whirl. I've always been a little afraid to blast away the grease in my levers on both road and MTB. I'm guessing once I do this, it needs to become part of my regular maintenance.

Correct?

And, of course, thanks for the help all of you!!
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Old 11-14-11, 11:57 PM
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Originally Posted by SEAtrain View Post
Cool, I'll give it a whirl. I've always been a little afraid to blast away the grease in my levers on both road and MTB. I'm guessing once I do this, it needs to become part of my regular maintenance.

Correct?

And, of course, thanks for the help all of you!!
Well, sort of. I applied this treatment to a set of original XTR shift levers when they quit on me. I can't recall if I ever had to re-lube them after that until the time I took them off. (They were 8-speed and I upgraded to 9.)
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Old 12-15-11, 12:08 AM
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I have a late 90s bike with this shifter and both shifters have the same issue: the thumb lever stopped working (or slowly dying).

In the front: I can't get it from a smaller ring to a larger ring.
In the rear: I can't get it from a smaller cog to a larger cog.

There is absolutely ZERO friction when I hit the thumb levers. It's like they're not attached to anything. It feels as if the cables were missing.

Besides WD-40, what else can I use to blast away? I use PB Blaster around the house to loosen stubborn bolts. Do you think that'll work? Or would it be overkill and damage the plastic?
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Old 12-15-11, 12:14 AM
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Originally Posted by wheeldeal View Post
I have a late 90s bike with this shifter and both shifters have the same issue: the thumb lever stopped working (or slowly dying).

In the front: I can't get it from a smaller ring to a larger ring.
In the rear: I can't get it from a smaller cog to a larger cog.

There is absolutely ZERO friction when I hit the thumb levers. It's like they're not attached to anything. It feels as if the cables were missing.

Besides WD-40, what else can I use to blast away? I use PB Blaster around the house to loosen stubborn bolts. Do you think that'll work? Or would it be overkill and damage the plastic?
I would not use PB Blaster. You want to loosen the hardened grease, not dissolve everything. Try some WD-40 first.

As I said above, this is very common with Shimano shifters that haven't been used in a while.
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Old 12-15-11, 12:19 AM
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But I've been using this bike the most! I just haven't used it for the past 6 months. If WD-40 doesn't work, what should I try? I've been pretty good with dripping Tri-Flow in there every few months. Maybe I over did it?
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Old 12-15-11, 11:09 AM
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Try it and come back.
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Old 12-15-11, 06:43 PM
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WD-40 didn't work. The little "hammer" thing was still stuck (and wasn't able to snap back in place). I used brake fluid instead. Worked like a charm! I then used WD-40 to "flush" out the brake fluid and lightly relubed. I think the problem is lubing too much. I may have been overzealous in the past when I was dripping Tri-Flow in there.
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Old 12-15-11, 08:15 PM
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I think you learned that you leave it alone until problems arise.
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Old 12-16-11, 04:48 PM
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This seems to be an eventual issue with all generations of trigger shifters. The problem is that the factory grease thickens over time. There is a spring loaded pawl attached to the lever that engages with the geared cam that actually pulls the cable. The spring force is very weak, and if the grease hardens, the pawl will stick "open". Flushing with a much thinner lubricant almost always fixes it. Sometimes you need to soak the entire shifter. It's much easier to fix if you can remove the cover and forcibly move the offending pawl back and forth to loosen things up.
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Old 12-16-11, 08:46 PM
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That's exactly what I did. I didn't know what that thing was called. I called it a hammer. "Pawl"...I'll note that down. I opened up the casing and flushed the entire thing w/WD-40. That didn't work. But brake fluid works perfectly! I poured it on the entire shifter and moved the hammer back & forth. I also used compressed air in conjunction with a toothpick to try to loosen whatever was sticking to that little hammer.
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