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case 430 3b point hitch re-seal

F

Full Floater

Member
Im thinking that i have an internal leak with my 3
point hitch. It will barely lift any weight and it has to
be a full throttle to do it. And it does so very slowly.
The pump is producing good pressure and the front
end loader works great. How exactly can i check for
internal leakage and what are some common fail
points? Im fairly confident in my wrenching skills but
i have never done any 3 point hitch work before. The
oil has been changed and is full, just an fyi
 
I don't claim to be an expert here, but from what you said it doesn't sound like the rockshaft piston seal is the problem. I replaced it on ours when the lifts would always drop overnight, and the torque tube was always low/out of hydraulic oil and the rear end was overfull. Lifted everything just fine though. Does yours hold the load at the height you leave it or drop again? Wish I could point you in the right direction, someone on here will for sure.
 
It does hold the load for a while with the engine off. But over the course of a few hours, it will drop to the ground. Then when I try to pick it up, I have to have the engine at full throttle and I also have to assist in lifting the implement. And it will still only barely lift it. Im just unsure and a bit intimated of what is involved in resealing if that's even what it needs, or where to get parts. Id like to order what I think I might need before I tear it apart.

How is the 3 point hitch disassembled? And are the rocker shaft seals the only seals in there?
 
If your 430 is the same as ours(they might have changed the rear ends, I'm not sure), it's not bad at all to reseal the 3pt. You remove the casting under the seat, and the piston/rockshaft come along. I could snap some external pictures if that would help you, also use the Case IH parts website. It works great for knowing what to expect on a job(what will fall out when you disassemble), and reassembly. It's not a service manual, but it helps a lot. From what you describe, I guess we can't rule out the seals being bad, but there's something else going on besides that. Sounds like control valve or??? Hopefully someone with experience on this series can help out here. I've done the 3pt re-seal and brakes, but not the valves and such. If you have any more questions, ask away!
 
I forgot to answer a couple of your questions. As far as seals, the one that would cause a problem would be on the rockshaft piston, I believe two pieces. One is just a wear ring, the other is the seal. There's also the housing gasket, although I might have just used Permatex. As far as disassembly, I don't remember exactly, but it was very simple once you get the housing off. Pretty much falls apart. Worst part I remember was getting that miserable devil seal back on the piston (use hot water).
 
Thanks Farmboy! That helps calm my nerves a lot. I have now ordered the rockershaft seals, they sent two, so one is probably the wear ring. And I got a housing gasket. Im now kind of looking forward to this job. Yeah I think you are right about there being something else possibly going on here but im at a loss for ideas and I'll start with the rockshaft seals, then I'll have the control valve re-sealed. I'll start with these "cheaper" things first.

Thanks again!
 
No problem! Best of luck with the project. You should start a new thread when you get it apart, tell what you found in there. My guess is many of the guys on here are busy in the field right now, so maybe someone will see it a second time around and chime in.
 
Now that I have an idea of how it comes apart, it looks more obvious to me what has to be taken apart as I look at the tractor. I don't think that I need pictures, yet....but thanks for the offer.
Another thing worth mentioning is when its at full throttle and trying to lift the implement, it has a subtle and occasional "shutter" as it trys and with that comes a little sound of maybe air escaping internally. Not much of a sound but it is there, and I don't really recall that with any other hydraulic things....
 
Update. I re-sealed the 3 point hydraulic piston today. The seal was a pain to get on but I used hot water and grease and I got it. Also replace a lager piece next to the seal. Not sure what its for but I replaced it anyway. And the symptoms are still the same. It will not lift the 3 point hitch with any sort of weight on it. So I removed the control valve next, inspected as best as I could and couldn't find any defects aside from some external leaks. So, im going to take it to a hydraulic shop to have them go through it or rebuild it.......Frustrating I tell ya...
 
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