Ok folks. Tale so far. Community truck for our road. Plow would not angle right. Right couplers would not come apart. Replaced all 4. With hoses connected to each other I can get the plow to angle by hand, but not easy. Figure it is an old plow. Bought a new C solenoid and valve. Hit the switch to angle right and it goes left and there is so much pressure on the right coupler that I have to take the coupler loose to bleed the pressure off. Thoughts? This critter has got to leave my yard. Thanks for your help in advance.