vickers hydraulic pump not working


I have a MF 711 skid steer loader which have 2 axel piston rotating cylinder block type pumps in a closed loop with a fixed motor. when I go up a incline one pump quiets working while the other one works fine, but if I back up both work fine both pumps are supplied from the same source of hy oil Any ideas out there to my problem???
thanks don
 
You have a sick relief valve in the forward direction on the one pump or the charge check valve is stuck open for reverse. Pump is fine.
 

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