I was just helping my friend who has a 2009 NH T1520 with 900hr. To make a long story short- the remains of one of the main engine bearings is in the bottom of the oil pan. After inquiring how the tractor was being used when it stopped I found out that the owners son had the throttle totally...
My 4310 has a bad vibration, mostly around 1700+ rpm. I pinpointed the torsion damper and just wanted to see if anyone can help me verify that it is the problem. The springs in the damper are loose- around 1/4 in. empty space. If you shake the damper back and forth the springs rattle freely...