OK Changed the filters one at a time. It was the Hydraulic filter under the belly of the tractor that was causing the issue. It was all dented up from me clearing a fence row. I figure it must have been slowing down the flow of the fluid.
I just posted on another link, but do you know the NH part number for the repair to your cracked fender?
I purchased a TZ24DA with the 12LA loader in 2004. Now has around 400 hours on it. Recently noticed that it is leaking engine oil. Seems to be coming from the bell housing area. Could this also be related to the frame cracking? I am away from my tractor now, but will check for frame cracks when I get the chance.