I just had my 5030 return from the dealer after having leak down problems. I'd have to constantly adjust the cylinders or I'd have one side of my bush hog 5" lower than the other. Although it took them two weeks to fix it, I learned much about it.
First, do you have the quick coupler releases where your T&T attach? If so, Kubota says that it is normal for it to leak down up to 3/4" an hour. If your T&T is set up direct, you should only lose about 1/4" an hour. I have the quick release, and mine was leaking over an inch in 3 minutes.
It turned out that I had a blown seal in one of my front loader cylinders. /forums/images/graemlins/shocked.gif I'd been moving the FEL constantly to either move stuff, or to see under or over it, so I hadn't noticed it leaking down. Needless to say, that isn't the first place the dealer looked when I'd complained about the T&T leaking down. I still don't know how it made such a difference, but after they replaced the one cylinder on the FEL, I quit having problems with the T&T. /forums/images/graemlins/confused.gif
Do you have leak down problems with your FEL? Kubota does have specific allowable leak down tolerances for each, and your dealer can get them from Kubota.
As others have described, if you only have one cylinder leaking, it could be that cylinder. However, it was explained to me that the tilt cylinder almost always has more pull on it with most implements than the top cylinder. That means that you'll notice the tilt leaking faster than the top even if the problem is elsewhere. Either way, your dealer should be able to find the problem. Mine apparently had them confused and looking in the wrong place, but with the factory's help, they found the problem when testing everything in the hydro system. Good luck!
