Don't think that they make a hydraulic fan for our trucks. I have had 2 trucks with the Hortons in them and have one complete fan assembly as a standby. Only problem I had with mine is when it was first installed the installer didn't use the furnished harness and just put it on a switch in the cab. It ended burning up the electro magnet because when it swiched off a spike goes down the line and ends up burning out the magnet. The harness is designed to eliminate that spike. Other than that, not one problem.
WD