So I have had a 100 ton compressor on a Trane RTAA270 chiller tripping on low oil flow every other day. So by reading the bulletins, and looking over here I figured out what was going on. Basically the compressor would start up at about 100%-108% RLA. I verified that the unload solenoid was energized for the intial 30 seconds. So I checked the oil level on the separator. It appeared to be normal, but it was slightly difficult to make the sight glass show the level at a consistant point. Is there a trick to doing this? I checked the bearing cavity pressure, and it was about 20-30 psi higher than suction like normal. After running everything through its paces I assumed that something was wrong with the unloader valve. So I got new valves. I found that the unload pill filter was plugged up. A trane bulletin I read said to discard the pill filters due to them being for start up debris. Should I get new ones? Well after I got everything back up and running. I heard a hot gas leakage noise near the discharge line of the compressor. It sounded internal to the compressor. The RLA % starts out a lot lower now, but still hovers kind of high. I remeasured the bearing cavity pressure, and now it is about 110 psi higher than the suction pressure. The system is now tripping on low oil flow immediately. By removing the pill filter restriction did I open up a possible lip seal problem now? I haven't seen a defective lip seal yet. Can someone tell me if the issues I am having now is a lip seal? I order a lip seal kit to install tomorrow, but I just want to make sure that I am right. So if one of you RTAA experts can give me some advice I would greatly appreciate it. The wierd thing is I deenergized the unload solenoid to simulate a complete restriction, and the hot gas can still be heard internally. I installed the valves, and gaskets the exact way that I took them off.