I have used lucas hyd conditioner and sealant a couple of times with moderate success. I have a couple of ih3588's with alot of hyd leaks. Put a couple of gallons in each and seemed to dry up alot of the smaller anoying leaks. didn't stop anything major. But more to your problem, I have a cih 1594. 3 sp gear box with 4 sp power shift. Power shift 1 and 2 were fine but it got so it wouldn't always go into 3 and 4 . Would go into those gears but not solidly. would move but slip under any load. Sometimes would shift solidly after running it awhile. Runs a discbine. last fall got so it wouldn't go into 3 and 4 at all. Talking to mechcanics, they suspect that the clutch pack seals are leaking. What did i have to lose. Put about 5 qts of the lucas in it. Didn't totaly cure the problem , but has been very usable this summer. Sometimes it shifts properly right away, and sometimes have to run it awhile. So it looks like thats where you are at. What have you got to lose?
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