D6-C 99J power steering problem

I have a direct drive D6-C that the power steering does not work until the cat has warmed up for 20 min or longer. I checked the sump strainer in the bottom of the clutch housing and it was clean also no oil ran out when I removed the plug, then checked strainer and magnets under the left floorboard and there was some metal fillings and crud but not bad. it steers real well once it starts working but seems to be getting worse with time. I have not checked he pressures yet any ideas.

D6-C 99J power steering problem