5020 loader hydraulics

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This first happened lat month in the big snow storm.  Hydraulics stopped after a couple of hours.  Pump squealed like it had no fluid.  I let it sit for a while, and then it worked fine again.
After the snow, figured it was time for service.  drained system, cleaned strainer, refilled with new UTH.
Used the loader last Saturday for 4-5 hours off and on, and no problems.
Yesterday used the loader extensively almost non-stop for about 4 hours or so and then same problem.  Noise from the pump, little or no cylinder movement.  System is full, and no leaks.  If I let it sit and cool for 15 minutes or so, then it would work again for a few minutes and then stop.
Any thoughts?  pump weak?  Oil overheat?  pump overheat? wrong oil? crap in the system that's blocked strainer?

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alan-nj Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 12 Sep 2009 Location: oxford, nj Points: 847	Post Options Post Reply Quote alan-nj Report Post Thanks(0) Quote Reply Topic: 5020 loader hydraulics Posted: 16 Apr 2017 at 9:58am
	This first happened lat month in the big snow storm. Hydraulics stopped after a couple of hours. Pump squealed like it had no fluid. I let it sit for a while, and then it worked fine again. After the snow, figured it was time for service. drained system, cleaned strainer, refilled with new UTH. Used the loader last Saturday for 4-5 hours off and on, and no problems. Yesterday used the loader extensively almost non-stop for about 4 hours or so and then same problem. Noise from the pump, little or no cylinder movement. System is full, and no leaks. If I let it sit and cool for 15 minutes or so, then it would work again for a few minutes and then stop. Any thoughts? pump weak? Oil overheat? pump overheat? wrong oil? crap in the system that's blocked strainer?
	If ignorance is bliss, than happy days are here again.

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alan-nj Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 12 Sep 2009 Location: oxford, nj Points: 847	Post Options Post Reply Quote alan-nj Report Post Thanks(0) Quote Reply Posted: 16 Apr 2017 at 11:00am
	If I wait until it's completely cold it will work fine for a long time
	If ignorance is bliss, than happy days are here again.

dt1050 Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 05 Jul 2011 Location: central pa Points: 1078	Post Options Post Reply Quote dt1050 Report Post Thanks(0) Quote Reply Posted: 16 Apr 2017 at 11:52am
	sounds like the oil is getting hot, maybe over heating the pump
	Just cause it's orange don't make it a tractor, there's only one..Allis Chalmers