1850 hydraulic issues

I was planting, made my turn and just as I went to drop the planter, I had no steering and no hydraulics to the planter, 3 pt or steering. Checked with a local guy and we determined I had a self regulating bypass valve, so I replaced it with a "spring and shim" style bypass valve. Immediately I had steering, so I drove the tractor about 1/4 mile down the road and steering quit again. Now the 3 pt work and it sounds like remotes work (I disconnected planter and hooked to another tractor to finish planting). The steering worked intermittently for a few laps around the yard, now nothing. Removed and cleaned bi directional valve and even tried another one. No pressure up to the steering motor. This is a 1967 1850 with Perkins diesel and over/under. Any thoughts would be appreciated.
 
Could your oil pick tube up be plugged in the reservoir? If debris
or a cap went down the fill neck. I have seen nasty stuff come
out of a jug and pail. Also check the shaft that engages the
flywheel and runs your pro. If the splined end wears out your
shaft will not turn and you will have no hydraulics or Pto.
 

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