1170 power steering and hydraulics

After running the 1170 for a few hrs and getting the hydraulic fluid warm, the power steering would only work if the tractor was at half throttle or more, the hydraulics were slower than normal too. Once the hydraulic oil sat and cooled off, everything worked fine again, even at idle. What could the issue be?
 
sounds to me like a worn gear pump.....when they begin to wear out they lose their ability to pump oil as it gets thin from being hot....
 

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