I have a coats 40 40 The changer seems to not want to spin the entire distance. I will help it with a pipe wrench to complete the rotation. The air pressure that it runs on is 125 psi. It is supplied with a 1/2 air hose with no restriction.
I know this is super old thread, but do you know what type of hydraulic oil? All the manuals I find seem to spec out some Coats brand snake oil. Prefer not to pay $90/qt if it's the same stuff I put in my bobcat from 5 gallon drums.
Honestly, you can't go wrong. All it's doing is taking up space in the form of a liquid. It has no real service requirements of any kind. I don't know much about the piston seals, but they must be compatible with hydrocarbons.
Thanks. I tracked down a few other obscure Coats documents and they seem to spec brands that are between iso 24->46 which is all pretty commonly available. So I guess in it goes.
I've probably changed 50+ tires with it since I bought it and it's pretty bullet proof. I was planning to pull it apart and grease all the pins since it rode out a couple floods at my old house. Still works though!