Fordson super major hydraulics will raise only

I recently bought a tractor.
Thanks to Majorman, he helped me identify it as a 1963 fordson new performance super major sold as a ford 5000.
The issue i am having is whenever i engage the pto with the handle in front of the clutch, the output shaft starts turning ( which is ok ) but the 3 point hitch lift arms, go all the way to the top. I cannot make them go down, or stay in a neutral position between up and down. I do not have anything attached to the 3 point hitch right now.
The only way the arms go down is by disengaging the pto and after a few minutes, they will go down, very slowly.
Engage the pto and they go straight back to the top.
It did this before i changed the fluids in the transmission and rear end. I used 15-40 in the motor, transmission and rear end and all the levels are where they should be.
There is a control handle to lift and lower the 3 point hitch, and a handle to the right, under my seat.
Should this handle be up or down ?
I dont have anyrhing plumbed off of the hydraulic block at all. .
Those 2 control handles are all that are there. I do not see any kind of flow control, or a push pull type knob or anything.
Which position should the handle be in ?
Up or down for 3 point hitch use only ?
And why will my lift arms go up, but not down when the pto is engaged ?
Thanks for any help.

The lever under the seat allows you to select draft or position control. Draft control is
for implements working in the soil or for tipping trailers. There is no good position in
the quadrant for neutral, it is quite hard to find.

Position control is for implements above the ground like mowers, sprayers etc and hitching up implements. The lift
arms raise as you move the main control lever up the quadrant in increments.

Draft control is lever up, position control is lever down.

The constant raise problem is most likely a stuck unload valve. This can happen if the
lift has not been used for some time. It requires the lift to be removed, the unload
valve plug drawn out of the lift cylinder and the unload valve freed off. You will need
help or some form of lifting gear to get the top off but not a bad job if you take your
time.

Brian

Thank you for that info. You sure have answered alot of my questions and i appreciate it, very much !
I have never taken the cover off of the rear differential in any tractor yet, but do all my own mechanic work.
Is there anywhere i could find a manual or picture of the valve that you are describing ?
I want to repair it myself, so i have the future knowledge of it, but am unsure of what i am looking for, once i get the top off.
Thanks again for the advice you have given me. It has been very helpful.

Try raising the handle under the seat and see what happens.
I think it's in the draft position now.

I have tried to lower the lift in both positions.
The only way i can get it to lower so far is to dis engage the pto.
Thank you for the information !
I am going to try to hook a set of hsrrows that weigh about 1k pounds and see if it will unstick the valve that majorman suggested.
My interest makes me want to pull the cover, just to say i have done it, but if i can get it to break loose, i will have gladly wait to pull the cover !
Thanks for the info yall have provided, it has been very useful to me.

I connected a set of harrows (which are pretty heavy )to the 3 point hitch and the tractor would only lift them with the engine reved about 1/2 way, but It finally picked them up slowly.
My father in law happened to turn the draft/position control handle, several times while the weight of the harrows were hanging , and the disc finally fell when the position lever was all the way down. Before that, the only way to let them down was to disengage the pto, and let the weight pull the arms down. So a valve must have been stuck, but somewhat started working again.
Now the issue is that the tractor will only lift them with the engine reved up. Without the engine being reved, the arms will get tight, but not enough force to lift them.
I noticed that if i push down on the draft/position control handle while the engine is idling, the arms try to raise, no matter the position of the lift/lower position handle.
Also when i pull the lift/lower position handle it seems to be connected to the draft/position control handle.
If i just easily switch the draft/position control handle down toward position control, and do not hold pressure downward on the lever, the arms will do whatever the position lever is telling them to do.
As i pull up, to lift a attachment, the draft/position handle rises up about 1-2 inches, along with the lift/lower position handle.
I dont know if that is somewhat normal with super major, or if i have possibly found the problematic area, or do i have a huge mess on my hands.. lol
I am at a loss again, on this issue, and i hope i have explained it well enough.
Thanks for any ideas or suggestions.

I connected a set of harrows (which are pretty heavy )to the 3 point hitch and the tractor would only lift them with the engine reved about 1/2 way, but It finally picked them up slowly.
My father in law happened to turn the draft/position control handle, several times while the weight of the harrows were hanging , and the disc finally fell when the position lever was all the way down. Before that, the only way to let them down was to disengage the pto, and let the weight pull the arms down. So a valve must have been stuck, but somewhat started working again.
Now the issue is that the tractor will only lift them with the engine reved up. Without the engine being reved, the arms will get tight, but not enough force to lift them.
I noticed that if i push down on the draft/position control handle while the engine is idling, the arms try to raise, no matter the position of the lift/lower position handle.
Also when i pull the lift/lower position handle it seems to be connected to the draft/position control handle.
If i just easily switch the draft/position control handle down toward position control, and do not hold pressure downward on the lever, the arms will do whatever the position lever is telling them to do.
As i pull up, to lift a attachment, the draft/position handle rises up about 1-2 inches, along with the lift/lower position handle.
I dont know if that is somewhat normal with super major, or if i have possibly found the problematic area, or do i have a huge mess on my hands.. lol
I am at a loss again, on this issue, and i hope i have explained it well enough.
Thanks for any ideas or suggestions.

I connected a set of harrows (which are pretty heavy )to the 3 point hitch and the tractor would only lift them with the engine reved about 1/2 way, but It finally picked them up slowly.
My father in law happened to turn the draft/position control handle, several times while the weight of the harrows were hanging , and the disc finally fell when the position lever was all the way down. Before that, the only way to let them down was to disengage the pto, and let the weight pull the arms down. So a valve must have been stuck, but somewhat started working again.
Now the issue is that the tractor will only lift them with the engine reved up. Without the engine being reved, the arms will get tight, but not enough force to lift them.
I noticed that if i push down on the draft/position control handle while the engine is idling, the arms try to raise, no matter the position of the lift/lower position handle.
Also when i pull the lift/lower position handle it seems to be connected to the draft/position control handle.
If i just easily switch the draft/position control handle down toward position control, and do not hold pressure downward on the lever, the arms will do whatever the position lever is telling them to do.
As i pull up, to lift a attachment, the draft/position handle rises up about 1-2 inches, along with the lift/lower position handle.
I dont know if that is somewhat normal with super major, or if i have possibly found the problematic area, or do i have a huge mess on my hands.. lol
I am at a loss again, on this issue, and i hope i have explained it well enough.
Thanks for any ideas or suggestions.

I found a diagram, which i will post a pic of.
I also have a picture of the plug that i removed, which i will attach. It is the plug that my pliers are pointed towards.
If this is indeed the same diagram that my tractor is supposed to have, can you look and tell me if the orientation of the parts are in the right place on the diagram vs what should be in a super major ?.
The diagram looks exactly like the parts that came out of mine, when i removed the threaded plug # 11.
So i am going to assume a 1963 new performance super major was made this way and the orientation of the parts is correct, unless you tell me otherwise.
If the diagram is correct, then some idiot has installed # 12,15,16 completely backwards.
What i mean is the parts ( guts ) are all installed 180 degrees from the orientation that the diagram shows.
The spring #14 isnt there at all !
Do i need to remove # 18 and try to free it up, or is #18 a stationary part ?
I think this part may be where my weak hydraulic and up only issue is coming from, and if so, how do i remove it ?
It seems like the pressure from the pump is dead headed, and not really flowing to remote block cover or the 3 point lift arms, but kind of stuck in beyween.
The reason i say that is, i tried, as a test, to leave the guts out of the assembly, and install the plug # 11 only, and sure enough the arms will raise and lower with engine at idle speed, like it is supposed to !
Can i try to lift a attachment this way ( gutted ) , or will i cause major damage ?
Can anyone advise me if this is the correct parts diagram for a 63 new performance super.major, , since all my parts match, i am assuming it is.
Where can i possibly find replacement parts, like the missing spring ?
Should i remove #18 from the bore and clean it, and if so, how do i remove it ?
Thanks for helping me with all these technical issues and i hope i have explained my issues, so they are understandable as to what i am actually dealing with.
Thanks for any information you can provide at all.

Here is a picture that i took zoomed in on the parts in question.