430 hydraulic system

in a rather short period of use the oil in the gear housing gets overfilled, and the torque tube reservoir gets low. would that most likely be the seals on the main shaft? my manual is not very detailed. if so do i need to split the tractor in that area?

Seal is bad on the 3-point lift piston. Just did the same on our 430 this summer. Real easy to fix (except getting the new seal on the piston), you remove the cover under the seat and the cylinder/piston are in there.

Farmboy may be correct, but the fluid transfer can be occuring elsewhere. If you raise the 3 PT Hitch arms, engine off, will they stay up? If they do, the problem is elsewhere.

i actually just did the seal on the 3pt lify piston. the old one looked ok to me , but the hydraulic shop that put on the seal for me said it was not good. so that part i would think be ok.

The other likely issue is the seal on the PTO shaft where it passes through the housings. You can determine whether it is the 3 pt piston seal or the PTO shaft seal by hanging an implement such as a plow or snowblower on the 3pt in raised position. If the implement settles to the ground after a few hours, it is the piston seal....if it stays up, the PTO seal is the likely culprit! In order to replace, you will need to drain oils, remove the entire PTO unit from the rear of the tractor and the top lid from the rearend.

If not the hitch piston seals, leak is through the main shaft seal and/or the PTO shaft seal. The main shaft seal is on the front of the transmission and requires a split to change. The main shaft is hollow with PTO shaft running down through the center. The PTO shaft seal is in the main shaft where the PTO exits at the partition that separates the transmission and differential sections.

The PTO shaft seal is the most likely leaker and is easily changed as it doesn"t require a split. Pull the cover under the seat. The #2 pic is what you see at the forward end of the differential section.

The pic are of my 310 and 1961-64 430 is identical (I don't know about later 430)and use the same original double lipped shaft seal Case p/n G13802 which is now obsolete. You will need to replace the double lipped seal with 2 single lipped seals. National seal p/n 471192 is what I used. You can also cross ref to Federal mogul, CR and others but Natl is the best in my opinion.

Check the bushing in front of the seal for wear. The bushing is dimpled so you can eyeball estimate the wear and see if it is uneven causing the PTO shaft to wobble and ruin the new seals.

Joe

Brian: Simply do what I suggested to eliminate any question about it.

Just went thru this entire problem. Please do the 3pt. piston test first. Simply raise the 3pt. and see if it slowly drops overnight. If it does, it is the piston seal.
I was not as lucky. My problem was the PTO shaft seal on my 530. Even worse, the entire seal/bushing assembly that presses into the transmission case had come backwards out of the case and was riding on the PTO shaft with the ring gears chewing at it.
Since I needed the entire assembly, rather than seals, it was expensive. For my 1968 Case 530, there was a complete assembly change and it got real complicated.
Even more complicated, there is NO info on how far to drive the new bushing/seal assembly into the transmission case.
I have all seal and installation info if needed. We even made a tool to put assembly in and drive it straight in without interference with ring gear. Good luck

CaseChev has a good point on installing the seal and also the housing if necessary. The ring gear makes it nearly impossible to start the seals straight from within the differential case.

You just about have to use a long rod on the seal driver that will reach from the PTO opening. I used a piece of 1/2" round stock cut to the desired length.

The 2nd pic is a view of the shaft seal through the PTO opening.

The 3rd pic is the 2 new National seals installed back to back.

Joe

thanks very much for the info. i have the lift arms up and will see what they do. i likely wont get at it for a while now, but with all that info i certianly can find the problem. pics are great, makes everything far less complicated. the tractor has other issues i am slowly wading through.