755 like a new tractor

[deere755]

I have owned my 755 for several years now and it has never performed the way it does now. The mechanic told me it should be putting out more power that the pump was not set right. I told him to do what ever it needed. Man what a difference. I had the chance to use it for the first time since I got it back on the bush hog. It was all most like there was nothing back there. He also increased the RPM's

 

[JD755]

Was this the injection pump? Any idea what he did?