I'm having trouble with my L370Grand losing oil from the HST vent. I mean it flows out in a steady stream. I pulled the filter off and all 10.5 gallons ran out. Is this normal?
If memory serves, removing the hydraulic suction filter will drain the majority of the sump. Removing the transmission filter will drain a quart or so max.
I'm guessing by the vent you mean up on top by the fill? Fluid shouldn't becoming out of there, was it over filled
If you don't want to drain all the fluid out, you can hook up a shop vac to the fill port, which causes enough suction so it won't run out the bottom ...