4200XL hydraulic issues

[gmmiller06]

So, I replaced the oil with Mobil 24. That did not solve my issue. The pump motor seemed to strain a bit more. It does sound like there is load on the pump motor when operating functions. Everything is just very slow and almost doesn't move at all. I am pretty sure it is a 4th valve issue and that the valve isn't closing as it should when the others are opened....but getting it lined back up in the correct spot is a challenge. If you move it too far, it closes the valve all the way and the motor shakes and I immediately turned loose of the control. I cant seem to find that sweet spot. Also, I have checked the 3 way switch on the controller and it is all correct. The wheel above the left joystick on the controller seems to have no effect on my model...not sure if it is supposed to.