I have a MF 5450 hooked to a new to me sprayer. I cant get the hydraulic valve to stay in detent, it runs the motor and pump but as soon as I let off the handle, it goes back to nuetral. I have tried switching the hoses to other valves, turning flow on the valve up and down, and reading the book. The book does say that the tractor is equipped with detent. What am i missing here?