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The top pivot (the one with the hole in it at the top of the image) on my Deore LX rear mech is sticking resulting in a loss of tension and chain jumping when I shift off the granny ring.
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Squirted it with all sorts and the bugger still sticks.
Am I wasting my time with a sealed unit or do I just need to keep squirting until something gets in and frees it up?
Can you not dismantle it? A circlip on the back holding it all together?
Maybe it's time for a new one.
Yep needs stripped and serviced. NIghtmare the first time...gets easier.
You can (as others have mentioned) take the circlip off and service inside that bit - but if your mech's pivots have started to go sloppy and the jockey wheels are worn it might be worth just investing in a new one
5mm allen key in a vice will effectively act as a 3rd hand when re-assembling, makes the job much easier.
Update.
Soaking it with a cocktail of GT85 and Finishline wet lube for 20 odd hours seems to have freed it up.
Allen keys back in the box.