Have a 2007 jd 320 skidloader, 3400hrs, bought it new, never had Amy issues before, last year the booms started settling down on it, running or not, it used to be really good and not settle at all. What causes this? And how do you fix it? I noticed one of the boom cylinder seals is a little wet. Doesn't use any hyd oil though, that wouldn't do it would it? Thanks