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SickBiker posted a topic in rear derailleursHow to overhaul the Shimano XT M8000 rear derailleur? It's a fairly easy job, which you can do, simply by following the steps from my video tutorial: Here are the pictures, that show some important steps of the Shimano XT M8000 rear derailleur service: You can disassemble the rear derailleur, without braking the chain. If the rear mech is very dirty, use some soapy water and a brush. The pulleys are NOT interchangeable and NOT symmetrical: the guide pulley is the upper one and the tension pulley is the lower one, pay attention to the arrows on the pulleys, indicating the direction of chain movement, while pedalling FORWARD. You can open the bearings, if the pulleys (jockey wheels) don't spin nicely. Removing the clutch is easy, but PAY ATTENTION to what parts you will grease - some have to stay clean, without the grease.