Int 460 Utility Whining noise and overheated hydraulics

I recently bought a Int 1958 460 Utility and upon replacing all the fluids, the hydraulic fluid had water and the hydl/Power steering filter was missing. I bought new fliter from Case IH dlr it had big whole on plate side which they mech showed me a part with a spring and screen that fit in it, so i bought that part and put the filter in, I previously drained and filled the hyd/tran with diesel to clean water out per dealer, then took out pump and cleaned and reinstalled with new gasket (they had two thickness he sold me thin one) So long story short after replacing all fluids incl PTO Planetary type proceded to start, At normal rev seemed ok at higher rev a whining noise, couldn't tell if pump or fact it had a filter in it. Noticed the filter wants to fall out as you install it but held it in with screw driver and pressed plate on, After an hour of working the tractor bush hogging, the right brake froze and smoked, noticed the tranny area was hot and a little fluid coming out of the fill plug ( i shut it down and theoried the hyd fluid was over heating and somehow heat transfer to break. After 2 hour cool down I bush hogged back to the bar ok and it didn't feel hot. Is hydraulic remaining engauged (hi pressure som how over heating) or what else is whining, didn't notice it when i bought it. (Also side note the PTO slips a bit, guessing the Bands need replacing, whorks a bit better if you pull up hard on pto enguage lever, but thick grass disengiages it until u stop for a second Thanks (sorry for long descript.

The best info I have is to assure all control valves are returning to neutral. The hydraulics are open centered in that position. The filter can cause restriction causing cavitation and pump damage. Cleaning often loosens grime and the filter needs to be changed once after the original. Some filter systems (NAPA) and others are different, and might flow more, check that option. There should be a latch on the PTO lever that locks it into gear. Check the linkage to determine if it is operational. Do not use it slipping, it is a very expensive error. Good luck, JimN

(quoted from post at 16:15:44 09/27/09) The best info I have is to assure all control valves are returning to neutral. The hydraulics are open centered in that position. The filter can cause restriction causing cavitation and pump damage. Cleaning often loosens grime and the filter needs to be changed once after the original. Some filter systems (NAPA) and others are different, and might flow more, check that option. There should be a latch on the PTO lever that locks it into gear. Check the linkage to determine if it is operational. Do not use it slipping, it is a very expensive error. Good luck, JimN

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The hydraulic valves on the 460 are NOT open center. The system is a closed center system with an unloader valve to dump the oil back to reservoir when there is no demand from the valves.

The orifice/screen assembly in the control block allows oil to flow through and open the unloader valve. When any of the hydraulic valves are moved the oil flowing through the orifice is dumped and allows the unloader valve to close. That allow the system to go on high pressure.

The standby pressure on the system should be about 60 PSI. If the orifice becomes plugged or there is too much leakage through the valves the system will stay on high pressure.

Owen is right, I was thinking incorrectly. Jim