I have a John deere excavator 350DL, the service advisor has no fault however all hydraulic functions are slow... both hydraulic pumps max out 2800 psi. Any idea or recommendation what might be causing this? thanks
It will be the main relief valve is either weak or there's something sticking it open.Remove valve and inspect. maybe try adjusting it up and see if it raises the pressure .
Yeah, I also think that you must check the valve first, if nothing happen then you must consult the service advisor again.
Hope it's not an electrical problem.
A loss of pressure can't be caused by an electrical fault. The electrics on the machine mainly determine pump flow, not pressure. Although they will increase pressure when using power boost, they won't cause it to go lower than the main relief setting.