X15 tractor vibrates when engine brake is on

[Waterloo]

I would pop the top and see if they put everything back, and check the torque on the bolts holding the valve train together. Pray they did not install with an air gun... And run an overhead. More than likely, like CP said, they screwed something up. Hell, my dealer installed all of the wrong parts in my 871 when they in framed it, and did a lousy job to boot. Me and Rawze tore it all apart and in frame'd it again!