Thanks for update.
They are a very reliable tractor, most common problem is Operator driving tractor with parking brake ON, some owners have added a flashing lite on the dash or even an audible alarm.
My brother farms with five of those Doncaster, UK built tractors, 454, 474, 684, 495 and 3230.
See link for IH manuals for the European versions of the IH 74 Series tractors, there are some differences with the North American version but most of the power train is the same.
Good luck with your 574.