Hydraulic Pump Direction

I am sending you 2 images of hydraulic pumps, one the control valve pushes rearward & the other one the valve pushes frontward. I have a pump that the valve pushes frontward, my question to you is can I change the control valve on this pump so it will push rearward? September 16, 2014.

I’ve never done that but I suspect if you had all the parts needed to make the change in the valve you could do it. The pistons, valve chambers, etc. on these pumps can often be interchanged but there are differences in the bores, shaft lengths and splines so be very careful if you try to make modifications. I would recommend getting a parts book for each of these pumps and compare the parts used. That should give you an idea of what will transfer from one pump to the other.