The MXM series is a NH TM series tractor. The MXM 175/190 have electronic controlled fuel pumps. If there is any lack of power it would be based on the electronics. Probabliy the emmissions controls limiting response based on turbo pressure. The engine is a 7.5L Genesis engine. That same engine in a CR940 combine will pull a sustained 300HP load. Combine has different injectors and a P series pump. Other than that it is the same engine.

When the merger of NH and CaseIH took place CNH went and respec'ed all of the electrical sensors and sending units, to a cheaper supplier. There were alot of issues with failed pressure warning switches, oil seeping from pressure warning switches ect. If they haven't failed by now you should be good to go. That is the main complain Case guys had about them. They always blamed NH but NH had no trouble with the tractors untill the merger took place. Corperate accountants were the problem not the design.