420T power steering problems

i have a 420t 4 speed with factory power steering that works off the hyd system. I cannot get it to turn all the way to the stops on either direction. it turn sright 2/3 to stop and to the left 1/3 of the way. i read about it might be not centered up, but would that not allow it to turn all the way in one direction? Could it be air locked. What should i check first?
Thanks,
Shawn
 

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