Ford 4835 pto will turn on and spin but has no power it will stall out with any applied load, electric engagement to turn on pto. Removed back cover took out all plates, fibers still have writing on them so do not seem to be worn much if any. can someone tell me what the clutch lockup pressure should be, I installed a gage on pressure line tee fitting at housing and recorded about 220 psi at about 1000 engine rpm.any ideas or sugggestions. Thanks CA AND.