Eng. 305 v6 unit is actually a hyster h225e the oil clutch seems to be overfilling pulled it out to get apart cleaned it up if there's a float inside the box and when you push it all the way up and blow air through the fitting on top of the box you can hear air coming through when you lower all the way down You hear a lot more air coming through the float I would think they're operates the same as a car float up closed down open in my correct thing in that way or could that be a reason for my overfilling