Max RPM is 1,400, but top 300 RPM is useless, max power is from 1,125 - 900 then it starts to taper off slowly, but she will keep plugging along till 500-600 rpm range which is idle speed.
I have been looking for the same setup my uncle has for a long time now, finding this made my day. He still uses his tractor and loader till this day ( as seen in my videos ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-nvozn0VHGuU.html ) Watching this brought me back to when I was a kid, watching my uncle haying
Many hours pulling a 5x5, 7x5, then a 9x5. I remember after harvest working wheat stubble, that old 1370 Case would piss and moan everytime it got into the trail made from the trucks...Never thought I'd miss those days