Just changed out my loader controls with a new Prince MB21BB5C1 2 spool loader valve. The one that came on the tractor (L 2800) was damaged in a storm. changed all the fluids and filters. I made sure that I hooked up the power beyond hoses correctly. I put in 8 gals of fluid. loader works great but 3 point will not do anything. also after putting in the fluid I still can't see any fluid in the level viewer. Help