1979 cat 930 wheel loader steering issues

i have a cat 930 wheel loader that i just recently changed the hydraulic pump cartridges in. had no problems with the steering until now. when i first changed the pump cartridges they were clocked opposite directions from how the original ones came out. could something be stuck in thr steering valve assembly? there is no leaks or sounds just seems like there is no pressure at the wheel and its very difficult to turn. need any advice asap please and thank you

1979 cat 930 wheel loader steering issues