I checked the IH 460 manual - hydraulics normal pressure is 900 - 1200psi, this increases to 1200 - 1500psi when valve is opened. Anything over 1500psi is considered abnormal and advises checking relief valve. I have several 460 manuals available on my web site www.manuals.us <http://www.manuals.us> or just email me, good luck, Allan.