Have a SUT with a loader. PO said it has been a few years since fluid has been changed. Strong suspect of some water in the fluid as the rubber around the shifter has been gooped up heavy. Also PO mentioned it had water in the fluid when he changed it a few years ago. Question is; How to get all the old fluid out of the system including the loader short of removing all the cylinders and manually draining cylinder, lines, valve, etc. Loader works good now other than the valve leaking past the seals. Could just drain the system as much as possible with the loader on and in place. Haven't looked at the fluid yet to see what it looks like.