Oliver 88 hydraulic woes

I have a new to me 88. It has two hydraulic control levers. The left side feeds two hoses that go to the cylinder on the 3 point hitch and the right two hoses are for an implement remote. I checked the pressure at the remote and it is 1000 psi at about 1/2 throttle. I raised the hitch all the way and it absolutely would not come down. Interestingly as I tried to lower the hitch the implement outlet showed pressure as well. I am certain the hoses are not crossed in any fashion. Next I attached the hitch cylinder to the remote outlet. It did go down all the way but very slowly. I then put it back on the left side outlets and it will raise but not lower. The implement outlets work well with an implement. What do you think could be the problem? On each side of the hydraulic reservoir there is a swivel fitting with an adjustment screw in the center. What is it's purpose? Also on the left side of the tractor this is in the forward most hole and on the right side it is in the rearward most hole. When I get this all corrected will this hitch have power down? Thanks for reading all this and I hope you can help.
 
Since those systems will interchange from the 88 all the way through the 880 we need to know which system you have before we can help you.
Does it have levers?   If it does are they long up towards the steering wheel?  Does it have a filter on the RH side?
 
Mr. Star is correct, there are 3 styles of units. There is also a serial number stamped near the gear shift handle. It might help to have that. Also the little screws you mentioned in the swivels are to adjust the speed of the hydraulic unit on the downward stroke. You might try to back each one of those 2 out about 3 turns and see what happens.
 
OK I have a little more of the necessary info. The hyd reservoir has a tag on the right side near the gear shift which has 54 020 on it. There is a filter on the right side. There are two long levers that go up near the bottom of the steering wheel. I tried posting a pic from my Ipad but was unsuccessful. Again I appreciate your help.
 

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