Sorry I keep asking so many questions. I just want to do it right and also don't want to make anything worse. I'm really nervous about running it with the supply to the pumps disconected since I just spent $3000 having the pumps and motors rebuilt. Would it help any to cap the case drain line? Would it hurt anything? The flow meter is rated for 3500 psi and the highest gauge I have is 4000 psi. Would these work between the pump and motor?Leave the flow meter in place when you remove the hose from the pumps. I want to see if we get more than 3 gpm then. Your charge pressure will be low because of the increase flow though the hose. Don't run any longer than necessary when you do this test. I have also thought about capping the hose to the pumps to see if the charge pressure would increase. If it does not, then the check valve or your gauge is at fault....When you get it back on the ground then try easing the levers forward to see if the motors speed up and slow down. The one I had I installed a flow meter to the motors with a gauge and you could watch the gauge pressure increase and decrease as the motor rotated. I had it up on stands when I did that. If you try an install a gauge in the high pressure circuit to the motors use a 6000 lb gauge or be sure you do not dead head the hydro pumps beyond what your gauge will take. I myself prefer a lower pressure gauge because it is easier to see the fluctuations.