Hydraulic oil leaking into engine

[grasser]

My '77 IH Cub seems to be leaking hydraulic oil into the engine.
The touch control works great with correct amount of fluid.
What do I need to do here?
Hoping I haven't damaged engine by having some hy-tran in there.

[Matt Kirsch]

All you need to do there is get the rebuild kit for the hydraulic pump, and put it in.

[Farmall X]

Second that, Been there recently.

[Barnyard]

Hoping I haven't damaged engine by having some hy-tran in there.

Justin, you'll be fine. Do the rebuild like the others said and change your motor oil while you're at it.

[Bob McCarty]

If the pump has been working fine, you may just need to replace the shaft seal. The older style is a seal, the newer style is an o-ring. They are available from TM: http://www.tmtractor.com/new/hy/396fp.htm If I'm wrong about this, I'll be taking a pump back off to redo it.

Bob

[rustymich]

Im with bob shaft seal get it anywhere problem solved,mine was..

[Rudi]

GSS-1024 Touch Control

Item # 9A below:

[grasser]

Thanks Men!
The seal looks like a place to start.
Anybody know what size it is (like something I could pick up at Napa to get up and going ASAP)?

[ricky racer]

If you remove the pump and take the o-ring / seal to NAPA, they can probably match something up for you.

[grasser]

I'm tore apart right now. Does the o-ring go on the outside of the housing?
Between the gear and the housing?
I see a groove behind the key on the shaft, but there's currently not an o-ring there.

[Bob McCarty]

If you look at Rudi's parts diagram, the o-ring goes in the left side of part # 10-A. You'll need to carefully remove the old one with a pick and then tease one side of the new o-ring into the groove and then work around until it all is seated. Lube the o-ring or shaft with some Hytran or oil before you reassemble it. Also, make sure part # 8 (pin seal) didn't pop out when you took it apart. It's black and about 1/2 the diameter of a pencil eraser.

Bob

[rustymich]

Fits in the lip of 10a theres a groove there for it....

[grasser]

Got it!

[challenger]

As we know, replacing the seal on the hydraulic pump is a reoccurring issue. Let me raise an issue here regarding this matter and get comments from members. I believe that a contributing factor to seal failure may be the closed nature of the hydraulic system. I realize the system was built this way. However, if the internal pressure in the closed system is a contributing factor to early seal failure and forcing hydraulic oil into the crankcase, is there any inherent reason why the system has to be closed and not vented?

[bob in CT]

Just to put things in perspective, his tractor is 36 years old.