Cork gasket leak, maybe?

West Valley G · #1 03-27-2021, 02:58 PM

Have a pretty good leak going on the 1862 and looking for some input. I just replaced the cork gasket on this hydro pump so its hard to believe that is where it is coming from, but. I am seeing the drip right at the bottom where the the pump and the transmission housing meet.

I guess what I am asking, is there something above that on the pump that could be leaking and running down to where I see it. The hydro valves were just rebuilt and they are dry. The lip seals on input shaft and out put are dry also. What else is up there?

It is only leaking when it is running so I know the leak is coming from above the fill level in the transmission.

thanks again

Its dripping right above where that rusty plug is.

DSCN1393.jpg

Ken

Sam Mac · #2 03-27-2021, 03:08 PM

Cork gasket is leaking. When you put the new one on put the 3 drain holes on top instead of lining them up with the holes in the case (red circles in pic). The later pumps drain back through the shaft bearing. I use some Permatex #2 on the gasket also.

Billy-O · #3 03-27-2021, 04:05 PM

The trunnion seals are up there, too!

Ambush · #4 03-27-2021, 08:19 PM

To piggyback WV's thread: Now that it's working a bit, I've found that same gasket is sweating on my 149. Can I tap a gasket out of cork gasket material?

With the rotational torque changing with every forward/reverse shift, cork seems an odd choice.

West Valley G · #5 03-27-2021, 10:08 PM

So if I get this right. I put the gasket in the exact same way that I took
it out only that is wrong. I am a bit confused on this one.

Ken

taylorjm · #6 03-27-2021, 10:51 PM

Quote:

Originally Posted by West Valley G

So if I get this right. I put the gasket in the exact same way that I took
it out only that is wrong. I am a bit confused on this one.

Ken

If Sam recommends putting it upside down with permatex, then that's what I'd do without hesitation. He knows what works better than the factory that built it.

R Bedell · #7 03-28-2021, 07:59 AM

I just done this job on my 784 last year. I installed it the same way it came out. Although CC does not recommend a sealant, I did use a slight film on the mating surfaces. No Problems.

ol'George · #8 03-28-2021, 08:19 AM

You might investigate the expansion plug just below the cork gasket, they do leak.
#2, sam is 100% correct as the return oil does flow through the bearing on the later units.
#3 yes you can cut a gasket out of cork, I've used neoprene. do make sure it is the correct thickness, as too thin and it will leak, too thick, and it can cause problems tightening up.
Moot point now, but you should have looked precisely where the leak originated from, so it don't continue to be a problem after you "fixed it".

Are we having fun yet?

West Valley G · #9 03-28-2021, 10:53 AM

Moot point now, but you should have looked precisely where the leak originated from, so it don't continue to be a problem after you "fixed it".

I did identify where it was leaking from in the first place. That is why I replaced the cork gasket, wrong like the factory apparently. And yes I am still having fun.

Ken

West Valley G · #10 04-17-2021, 02:36 PM

Well I pulled the tranny and pump again and replaced the cork gasket again. Put the holes at the top and used a little film of sealant. I have the exact same result with it dripping from very bottom of cork gasket. Everything above that spot is bone dry. Was super careful to make sure all was spotless before putting new gasket in. It will more then likely just have to leak for the summer now as my time is up to work on it. I was thinking about drying it up good and stuff a bunch of sealer around it, hate to do that but kind of at a loss here. Any thoughts.

Ken