Bleeding the hydraulic system on a JD400 loader

I borrowed a JD400 gas, industrial model loader. I just finished replacing the shaft seal on the power steering pump. I had to remove the oil radiator and the cylindrical tank the flows into it.
(hydraulic fluid was getting into crankcase thru a bad shaft seal)

Drained and Replaced all the fluids and oil filter.

Does this system need to be bled? If so where?

I actuated the bucket and backhoe before using it, put everything thru it paces till it ran smoothly.
After about 2 hours of use it ran out of gas, so I put 7 gallons of fresh gas in tank. After a couple of tries it started up and ran pretty good. But when I picked up a load of stone and I when to dumped it, the engine stalled.
I started it back up and each time I tilted the bucket the engine would stall.

I was thinking of changing the gas filter but it ran good until I tried to dump the bucket. When I switched the hydraulics to the backhoe it was now running a little rough too.
 

You did correct by cycling hyd functions to bleed any air out that might be in hyd system. Since engine is dying at completion of cyl stroke hyd pump may be slow to go out of stroke IE stop pumping oil or as you suggested engine fuel filter is partially clogged limiting engine HP.
 

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