At work we have a large Cummins get set we use to power a large portable screen plant. It originally cake from a coll get and was set up with a bunch of automatic controls which we had problems with. Cummins tech guy said the mother board was shot. We had them rework the generator to get rid of all the automatic stuff. When you flip the main now you have full power. Wired the gen interested he panel box of screen plant as usual. Went to do a trial run and try it out. All of the he conveyors on the plant get turned on in a certain order with he Shaker on the screen deck last. Voltage output was between 470 and 480. Perfect. When starting the conveyors the amp draw gauge would go up a little and then almost immediately show next to no draw. Everything still good. Last step is starting the shaker for the screen deck. This is where it goes not so good. Shaker has a soft start so it doesn't get full power right away. Hit the button for the shaker and amp draw gauge pegs at 250 amps. Volts still the same. This brings that big 6 cylinder cummins to it's knees almost stalling it out. This continues for about 20 seconds till the shaker is up to o speed. Once everything is running amp draw is around 65. This never happened before they worked on the gen. Did they do something wrong ? Will this hurt the electric motors on the screen ? Will this hurt the gen ?