Had my first run on our d4 6u yesterday. The first problem I encountered was while trying to start the main engine the starting pinion fell apart (just so everyone knows it's only a couple of bolts that hold it together so if they fall out it will fall apart) so reverted to pull starting. Got the tractor out and pulled it 1 meter in top gear and she fired up (and it was a cold day) finely got enough oil in the hyd unit and off we went for a quick try. Oil pressure at idle was about 25psig but it is only running on 3 pistons think it's an enjector still past the test so far little bit of work to be done to it