A david brown 995 recently i had replaced a supply line to my frontend loader valve that blew in the process .The new supply line got switched with the return line in installation loader arms would go up and bucket would tilt down thought the control valve was bad replaced it does the same thing with the new valve neither cylinders will retract and when they are fully extended out the cylinders the machine doesnt go in relief either any help would be appreciated thanks
Any checkvalve switched or turned the wrong way? Operation valve with integrated checkvalve misplaced?
My search of David Brown hydraulics turned up several comments that the valving is generally intolerant of dirt.  It would be worthwhile to clean all the valves.
There may be a valve stuck open, either because of dirt or the reverse connection of hoses and it is bypassing flow instead of causing flow to go to the cylinders.

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