I needed to replace my Hyd motor on my fan. Went to case dealership I gave them a grand they gave me a new Hyd motor... Installed I checked it out I can only get 4100 rpm totally rapped out. With my Hyd flow turned up all the way. My old one I was allways having the over speed alarm go off on me I think at 5500 rpm. Called parts guy he is going to make sure that he did not screw up.... The only other thing which I can not get around my head is I did have the manifold down I can't imagine how that would limit the rpm. I am 99% sure that my tractor Hyd are ok. Also wonder if the did have different fan rpm and just changed shiv size to get proper range?