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766 steering hydraulic pressure problem

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Tractor won't hardly steer, put in new thrust bearings, can rotate axle back and forth by hand but the steering wheel will hardly turn it.

Put pressure gauge on ateering cylinder, can only get gauge to 500 psi, pulled orifice out of mcv, clean, replaced preasure relief valve. 

No change.

Any suggestions greatly appreciated

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Thats about as far as I can go. If lube pressure is missing. It means loss of supply. Bad pump or blown oring in mcv. If lube pressure is there. Oil is leaking from steering circuit to regulated circuit. That usualy happens at relief valve but can be blown oring in mcv. Need to know what lube pressure is doing to tell which. Looks like you will be pulling mcv either way.

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