I have a Gravely PM 260Z. Love the machine. However it developed a hydraulic leak in the reservoir after about 90 hours. The dealer put a new reservoir in and said she is good to go. Well now 35 hours later I am having grinding and shimeying in the hydros when I turn to go up hill and surging when I stop. I completely cleaned the mower then took the it in 3 fridays ago, the mechanic let it idle for 45 minutes kept the mower til Wednesday and declared no hydraluic leak could be found. I re-explained the problem occurs under load and turning up hill and I don't know that it is leaking other than the goop all over the reservoir. I took back the mower to do my larger properties on Thurs and Friday. Bring it back on Monday. They decide they need to do a pressure test of the system, but don't have the tool to do it and need to wait to ask the owner if they can buy one. Apparently it is "expensive". The owner is on vacation and not to be disturbed. Send me home with the machine on thursday mow. They then decide I need a new hose of some sort by "talking" to Gravely tech support. New hose is ordered, but wrong one "comes in". Now I am on my 3rd week of this and will be using it again after the week end. But the problem is getting worse with each round of use. She is still under warranty for the next year, but with this kind of "help" what good is a warranty. Any suggestions? I am going to the gravely site in a sec to look for another local dealer.