Went out to mow today and my PTO won't engage at engine speed. I am able to get it to engage at the ground setting. I depressed the clutch fully and moved the lever to the engine setting, and nothing. I didn't even feel any engagement. The lever traveled as far as it will go - bumped against the mounts for the 3-point under the seat. Now that I think about it, it seems that the engagement point has been slowly creeping back. It was running fine on Friday when I ran the spreader. If I move the lever without the clutch depressed, I hear a grinding noise at that full backwards travel point, like it is trying to engage back there.