Kubota doesn't use any grease for the loader at the factory. They are assembled and greased by your dealer. He uses what ever grease he likes. When my new Kubota
L3400 was delivered several of the grease zerks still had paint over them and no grease in the joints. Just a wad on top of the zerk where the dealers mechanic put a grease gun to it, but did not notice the zerk took NO grease. I scraped the paint off of the zerks at about 3 hours when I noticed "sqeaking sounds" coming from the loader. And, personal opinion here, but in a low speed application like a loader, I don't think it matters what grease you use as much as the fact you grease at least every 10 hours of use to keep the dirt/water out of the joints. I doubt you can figure out what grease was used upon initial lubrication, unless you ask your dealer. I would just grease it well now, with the grease of your choice, and use it a bit, and grease again to help force out the original grease, and then you will know what kind of grease is in it.
James K0UA