Here we are offering the Bosch Diesel Injection Pump from an UB 5 Star or early M5 Minneapolis Moline tractor. So I dont know any history on it. It does turn by hand and all the ports were plugged and taped when it came in. I shined a flashlight in the ouput ports as i turned it and I can see motion in there. That tells me the head and rotor are good. And for gosh sakes folks, if your not going to pay, please keep looking….. The item “Minneapolis Moline UB 5 Star M5 Bosch Diesel Injection Pump 283 336 Tractor Pull” is in sale since Wednesday, October 28, 2015. This item is in the category “Business & Industrial\Heavy Equipment Parts & Accs\Tractor Parts”. The seller is “gravertrestoration” and is located in Central City, Nebraska. This item can be shipped to United States.