I changed my hydraulic filter on my TC-40A (w/Hydro drive) last year and ever since, it seems that the hydraulics have been sluggish and weaker. I noticed when I changed the filter that the old filter was a larger diameter than the new one that I got from the NH dealer. I double checked the part number and it was the correct filter. The only thing I can think of is that the previous owner found an oversized filter that had better flow. Has anyone one seen this before? Anyone know where can I find an oversized filter? (this is the main filter next to the RH rear wheel)