Case 440 three point will not go down.

Good Afternoon, I thought that my summer project was up and running but now I have another problem. My three-point on my 1969 Case 440 will not go down. I recently rebuilt the power steering cylinders and now they work like a charm. I didn't know if that had something to do with it. I think the three-point was working when I parked it this fall. Would like some direction on this problem. Thanks

Put some weight on the 3pt arms. Probably just stuck in the up position from setting.-
------Loren

Thank you for replying I tried that didn't help. When I got the tractor started the arms were in the down position and moved up but just will not go down. It feels like it is pressurized. Would change the power steering have anything to do with this??

Make sure the tractor is running, put the lever in the down position, then stand on the 3point arms. Should go down.
Jim

No the power steering is a separate system with it's own pump and controls. The next thing that I would do is to check all the mechanical linkage from lever to the DOM control valve which is under the RH of the seat. If everything there seams OK, then I would loosen the line from the DOM valve to the 3pt housing and see if arms drop and oil flows from 3pt housing. If so, you will have to remove the little cover on the DOM valve and make sure that all the plungers and check balls are free. Be careful when removing the cover. parts can fall out.--
-Loren

Thanks Jim. I had my son (18teen year old big kid) stand on the arms while the engine was running and I moved the lever up and down. The arms went up slightly but not down at all. Thanks

He said he redid the steering cylinders. That tells me he has a later tractor with a Draft-0-Matic 3pt hitch. The arms on them will drop regardless of the engine running. It sounds to me that the hold spool is stuck in the DOM valve.------Loren

Loren, thanks I going to check this shortly. Do you have any pictures of the DOM pump? Not sure what it looks like.

Thanks
John

The hydraulic pump is bolted to the bottom of the cover where the remote control
valves are mounted under the fuel tank. The pump is in the torque tube and not visible
without removing the hood, fuel tank, and remote valves and cover assy.It has nothing
to do with the 3pt not lowering. Your problem is with the DOM valve under the seat if
you get the arms to drop when you loosen the line from DOM valve to 3pt rockshaft
housing.------Loren

I loosen the line and no fluid came out.

i think Lorens right .Your Draft O matic valve is stuck .. Another
thought occasionally one of my 430s will stik up if the lift
piston is forced up too hi ,, when that happens i take a short
chain and hook low to a tree and gently pull,. comes right down.

Thanks I will try that and let you know.

OK, in that case (no pun intended) you have a mechanical problem in the rockshaft housing. Piston seals rusted into cylinder bore, or the arms were lifted too high, and the donkey dong is out of place and holding the arms up. If this is the case DO NOT try to force the arms down.
In the pic., the donkey dong that I refer to is the large round rod above the piston in the pic. attached to the lifting bellcrank arm at the top. The donkey dong is not attached to the piston. The back of the piston is an inverted cone and the donkey dong just centers itself into the back of the piston.
It is becoming evident that you may have to remove the rockshaft housing and determine what is wrong. Removing the rockshaft housing is pretty straight forward and takes less than an hour. Keep us posted on your progress.------Loren
PS just an after thought: Is there any extra movement in the rockshaft above where it is?? Can you lift the arms up further by hand????? If soo, lift them by hand and let them drop a couple times. That may dislodge the donkey dong if it is out of place or free up the piston if it is stuck. Worth a try and nothing to loose.

Short drop with that pony peter is fine, longer drop can knock a chunk out of the piston skirt.

Joe

UPDATE: Thank both of you for your help. Yesterday (In fustration) I pickup the 3 point arms and "dropped" them. The arms went down some so
I pushed down on the arm and they stared going down. I started the tractor and the arms went up but not down. So I repeated the process and
sure enought the arms went down. So it must have fixed itself. Thanks again for all your help and I will be sure to reach out with my
progress of this project.