X15 tractor vibrates when engine brake is on

[Edjahman]

579 Pete with an X15 Cummins. 2018

It just had a new cam put in it around Thanksgiving.

I don't know if this is related but when the engine brake is on, especially when loaded it'll shake then it'll be normal. It seems much worse on all 6 cylinders as expected.

It seems to be intermittent.

Also I noticed when driving really slow in heavy traffic the engine brake feels like it's on with the switch turned off slightly when I remove my foot from the accelerator but maybe it's my imagination.

I just purchased this tractor so I'm getting used to what feels normal.

Thank you