New Holland TN75 Steering Cylinder Seals Question…

mustangmarty1967 · Nov 29, 2025

I’m trying to replace the seals in the steering cylinder (pn# 5189892) of my new to me TN75 using seals kit # 5190591. Can anyone help me to know which outer seals go where?

IH3444 · Nov 29, 2025

If you have some dial calipers, you could measure the inside grooves and then match up the O-rings. The O-rings will be slightly smaller ID than your measured grooves on your cylinder rod.
Looks to be an aftermarket universal kit so the O-rings might not match up well. Did Messicks have a kit for your TN75 tractor?

mustangmarty1967 · Nov 29, 2025

I have a caliper and tried that. But these seals will need to hold close to 2,800 psi, so I wanna make sure I put them in the right place. I know for sure where the hard green seal goes, but it’s thinner than the depth of the groove. So I’m thinking maybe one of the black rubber O-rings goes in that groove first and then the hard green one goes on top of that.

Messicks has the kit, but they want $180 for it after shipping and tax. For 50 bucks more, I can get a whole rebuilt steering cylinder.

I want to buy a service repair manual for this tractor but don’t know which one will show me exactly which size seals go in which grooves. Anybody have that page in their manual and can tell which manual to get that will he ave that much detail?

Harry in Ky · Nov 30, 2025

I doubt a service manual would help you much as far as which goes where. What happened to all the old seals? Most people simply match the new against the old, size for size and it's pretty self explanatory. The tricks come in when inserting the shaft and wiper seals into their respective bores. Then the piston seal usually requires some attention as well. Are you prepared for that one?

mustangmarty1967 · Nov 30, 2025

The outer most seal was completely missing. I know where the green Teflon seal goes because the old one was in pieces in that groove, which is where the leak was. But the new green Teflon seal isn’t thick enough to reach the bottom of the groove and seal against the cylinder wall at the same time, which is why I’m wondering if the bigger black rubber seal goes in that groove first and then the green Teflon seal goes on top of it? There was no other seal in that groove when I took it apart. But it may just be that the last person in there didn’t put it the way it’s supposed to be?

Harry in Ky · Nov 30, 2025

I'm not sure what seals you're looking at, but it sounds to me the kit isn't an exact match for what you took out. If the parts don't fit, don't use them. Maybe there is a shop within reasonable distance that works on cylinders? You could take it all there and get a second opinion of what goes where or if it should work with what you have. Or you could start over looking for another seal kit.