Any order for the 3 hydraulic hoses in connecting to tractor hydraulics?

SOURCE: how do you fill a ac delco hydraulic 3 ton floor

DONT KNOW WHO BUILT THIS JACK- AC DELCO JUST PUT STICKERS ON IT. TYPICALLY YOU REMOVE A PLASTIC SCREW IN PLUG OR A POP IN RUBBER STOPPER FROM THE TOPSIDE OF THE CYLINDER. WITH THE JACK ALL THE DOWN, FILL IT COMPLETELY UP AND IT SHOULD WORK. SOMETIMES THEY GET AIR IN THEM - JUST LEAVE THE PLUG OUT AND JACK IT UP A FEW TIMES, THEN INSERT PLUG. USUALLY 10 WEIGHT HYD OIL. OR "JACK OIL" AT THE STORE.

SOURCE: system creeps down even when tractor is operating.

There are 2 potential problems -
1. Leaking spool on the control valve - rebuild the vale.

2. Cylinder blow-by. Disassemble piston and replace the seals.

To test if its the cylinder - retract the cylinders all the way... remove the hoses on the blind end (non rod end) of each cylinder, and again pull the valve to the retract position.

If fluid continues to pour out of the cylinder - the piston seal is damaged, and the affected cylinder must be repaired.

To test if the valve spool is faulty - disconnect the a and b ports just after the valve. Turn on the system and check for seepage from the disconnected lines (without moving the lever).

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SOURCE: John Deere 1020 Weak 3 point hydraulics

I would suggest you find a JD dealer and buy a manual if you want to do the maintenance yourself. You can also do a Google search and find manuals.

I would also suggest you completely drain the old hydraulic fluid and replace it with new fluid and a new filter if it has not been serviced any time in the recent past.

The symptoms you describe can be low fluid and/or a clogged filter. If you or anyone else has run the tractor too long and it has low fluids and/or a clogged filter, you can damage the hydraulic pump and that can get costly.

SOURCE: Ford 5000 Tractor 3-point doesn't go up but the

This can get a bit complicated, and not for the faint of heart.

I have seen this in a lot of older tractors Generally it is a poppet valve inside one of the spool valves
These systems operate at 1500 to 2200 PSI
I had an Oliver 1755 that we tried everything new O rings the works until I had on old neighbor tell me to replace the poppets - under high pressure the nylon ball which had split would seperate and not allow fluid to pass then under high pressure it would push back together and you honestly could not see that it had broken
$ 12 bucks worth of new parts and it works like a dream In the past 10 years I have seen and fixed more than 20 old tractors with the same issue/solution

SOURCE: 2090 case trasmission problems

That's because you have two separate pumps controlling each. My best advice is to get a farm mechanic to take a look...it may be a simple seal to a need for a rebuilt pump. www.nyagparts.com