We have a new New Holland tractor with a Allamo- Trimuph mower sycle bar that doesn't cut grass to well. It only "half cuts" and just knocks the rest over, wich in a day or so stands back up again. I've tryed different speeds & RPM's but the same results. The blades are also new. I've also tryed to raise the bar a few inches while mowing but the same results. Can anyone help us out ?