Ford 1210 with 3 point that won't go down...

[Harry in Ky]

Somehow I doubt the problem is trapped hydraulic fluid holding the lift arms up. I find most often in cases such as this the cross shaft is stuck. Sometimes stuck so solidly it can be a major project to get it moving again. In MOST cases, there is a little "free play" in the lift arm travel when it's all the way up. If properly adjusted, when the lift arms are up, you can grab a link, (with nothing attached of course) lift up, see and feel the arms go up a short distance then drop down again when you let go. With a seized cross shaft you won't move it at all. There may be some slop in the pins, but the shaft itself will not rotate in the bushings. Try moving it by hand and see what happens.

 

[sandman2234]

Well, crank tractor up, raise lever and hydraulic fluid sprays out the right side hole. Piston is all the way down in bore, and lift arms are up, STILL! Seems like I might have a mechanical issue!
David from jax

 

[sandman2234]

Harry, Welcome to my party! I had previously sprayed Kroll on that cross shaft, and did it again after I got the head off.
I got the grapple on the M7040 and set it on a pipe suspended by a chain on 3pt. Weight wouldn't do anything, so I curled the grapple down and it moved! Backed off, checked piston, it had moved, so I stood on the lift arms and it went the rest of the way down.
Now to put it back together and see what kind of damage I did forcing the piston.
Things may be better now, but at least I know where the problem is!
THANKS EVERYONE!
David from jax

 

[sandman2234]

Well, fired it up, slid the arm to raise the lift arms and nothing happened.
It may be low on fluid, as I lost quite a bit. No sense in checking because I don't have any to add. I will get some this week.
The pump was left in the notch, which is a no-no when nothing is hooked to aux service port. No telling how long, as that was where it was at when I first heard the tractor run, and I reached over and moved the lift lever out of the notch.
Hopefully the only issue is low hydraulic fluid!
David from jax

 

[sandman2234]

Or maybe not...!
I grabbed the lift arms and tried to raise them, wouldn't move. So I hooked a chain to them and raised them with the M7040. Rear end off ground, still no movement. I set a pair of jackstands under the lift arms and lowered the lift arms to them. Now the tractor rear wheels are 10" off the ground, supported ny the lift arms. I hosed the shaft down with penetrating liquid and leaving it for the night.
David from jax

 

[JC-jetro]

David this is mechanical bind of some sort. In y9ur picture I could not see the removable piston sleeve like the pics below. Were you able to take the piston out? I wonder if the ram rod is bound up against something internally or damaged. Need to see behind the piston. Below is the geometry of all 1000 series I have seen. I might go to NH website to see if you have sleeve or not for the lift piston.

Lift cylinder with cylinder head sleeve. There is an o-ring that seals the cylinder against the head.

Bad seal that was leaking

new seal:

Back of cylinder where ram rod rest against the concave depression in the piston.

 

[JC-jetro]

David ,

Look at the link below, I was able to print the diagram in PDF. At any rate your lift system does not have the sleeve and the rod and piston appears to be on piece. Never seen it like that before. with the head removed and the arm pushed down the piston should come out, but I am curious how if the piston and rod happen to be one piece. I hope that does not require complete lift cover under the operator seat. I am very surprised.

I have a link below and also a PDF file attached here. You can check both sources. look parts no, 13,16 and 17.

https://www.mycnhistore.com/us/en/newhollandag/na/tractors/compact/naba17com0553cyl/3-cyl-compact-tractor/hydraulic-systems/lift-cover-arms-1110-1210/cn/296C1CCB-B8BF-E111-9FCE-005056875BD6/C4E9724F-E6BE-E111-9FCE-005056875BD6

 

[sandman2234]

I am still with Harry thinking that it might be the rockshaft(?) as it could be corroded between the steel shaft and aluminum housing. I am going to check hydraulic level, then maybe check the hydraulic pressure before I tear into that lift housing to remove the piston.
Wish me luck!
David from hax

 

[JC-jetro]

David, This thing got me stomped. The attached drawing from my previous post shows Item#13 as Rod and item #16 as piston as if they are separate but the pic shows them as one piece. The only thing can keep the rock shaft from rotating is item#12 that they call Rod. Something must be seriously bound up. It must be one heck of corrosion to keep the rockshaft from rotating. Might want to heat it a bit externally and spray some penetrating oil from outside.

 

[Harry in Ky]

I disagree. The problem is between bushings (item 2 and item 3) and shaft item 4. The arm, rod, and piston are merely going along for the ride. The piston seized in the cylinder bore is a possible, yes, but I'm betting on the shaft.