Steve, When you have a bad seal on the hydraulic pump input shaft, Hy-Tran fluid leaks past the seal into the engine crankcase. I had that problem on a SA several years ago, engine oil level rising, hydraulic fluid disappearing from the unit. Put in new hydraulic pump seal, problem solved. Not a complicated job (if I can do it).
If you drained and installed new fluid, you may have had air trapped in the system while filling and after the air was purged by operating the lifts the fluid level may have dropped to replace air pockets. Proper fluid level is to the bottom of the fill plug opening, but I guess you knew that. Be careful taking the fill plug out - sometimes there can be air pressure behind it.
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