I'm servicing my rear derailleur jockey wheels (pulley wheels) for the first time. They have about 20,000km on them. The derailleur is a Shimano Deore LX, and the first jockey wheel I've taken apart is the Shimano Centeron G-Pulley.
I've disassembled and cleaned it to this point:
The two spacers/ end caps (the larger steel washers on the left) just popped off on their own, and the metal cylinder sitting on its own popped out of the middle of the wheel easily. I think that's a bushing. Most of what I'm seeing online talks about prying a cap off the jockey wheel to expose bearings, but it doesn't seem like this wheel wants to come apart any further. And if that cylinder is indeed a bushing, I think that means there won't be bearings, and the bushing is the thing about which the rotation occurs.
There are two little slots on either side of the channel that runs around the side of the wheel:
I thought those might be for slotting a small screwdriver into to pry something apart, but I tried that and nothing else moved. The slotted metal collar that's still inside the wheel also doesn't seem to want to rotate relative to the wheel or pop out, and the teeth around it make me thing it's a permanent press-fit piece.
So I have four questions:
- Should this come apart any further? If so, how?
- When reassembling, what type of lubricant should I use? Advice online is all over the place: 10 minutes of Googling suggested grease, oil, teflon, ceramic, other exotic synthetics, or no lube at all. I have on hand Phil Wood Grease, Phil Tenacious Oil, classic WD-40, and WD-40 Silicone. I'm hoping one of those is appropriate.
- Should lubricant be applied to both the outside surface (blue arrow in first pic below) and inside surface (green arrow) of the bushing, or just outside?
- Should any lubricant be added to the channels that the spacers sit in (yellow circle in second pic below), or to the outside faces of the spacers themselves?
Note: the second jockey wheel is labelled "Narrow" and is almost identical except the inside surface of the wheel itself, i.e. that the surface that rotates about the bushing, is plastic. Same questions apply to both wheels.