I'm a newb to TLBs and I don't see a grease fitting for the joint shown in the picture. Thanks
If there is not a zerk fitting on the back side of that pin, then it’s a non greasable pin. Not that uncommon, there are some pins on my 580 SE that I think should be greasable but are not. If you have the operators manual, they will usually show you visually, the grease points. If you don’t have one, I suggest you get one, in fact get all three as they usually prove to be invaluable, if you plan on doing any work yourself.
There's no grease fitting at that spot on the 580M and I believe the 590SN is the same. There are two bushings pressed into each control arm. These bushings were "gone" on my TLB when I bought it, and the loader linkage was very loose. There was no evidence bushings had ever been there. I was fortunate the bushing bores in the loader arms were OK. I installed bushings and replaced the spacer tubes that go in the bushing bores. I did this 5 years ago and they're already loose again, but nowhere as bad as they were.