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John Deere 310 A Hydralic problems

I have a John deere 310A back hoe loader, I do not seem to be getting enough hydralic fluid through the pump form the transmision valave, I do not get any return to the cooler from the transmision valve I took the valave apart and am going to replace all of the gaskets in the valave, Do I need to replace the transmision pump that feeds the transmision valve several pepole have told me that there is an internal pump in the transmision that needs to be repalced is it the transmision pump.
I also know that the main pump works fine when I feed the return line from the cooler to the pump with fluid everything works great. Do I need to replace transmision pump? to fix the hydralic problem also is it easier to do by removing the cover on the transmision?

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Jd 310 A, boom down to dig then back off stick alittle and circut loses power.

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