Hydro Pump Gasket
 

I have a model 149 that I have split and replaced the hydro pump to rear end gasket three times! It continues to leak :angry:

I originally took it apart to repair the trunnion and replace all the seals. Upon putting it back together, I noticed Hytran leaking after two days. So I waited a while, then pulled it apart again. I was very careful to remove the old gasket and clean all surfaces thoroughly with paint thinner. I only use OEM gaskets and I tightened the bolts to spec with a torque wrench.

It was a PITA to take it apart again, but everything seemed okay—until two days later, when again it starts to leak. So I pull it apart again.

All three times it has been the same thing. I complete the repair, mow the lawn for an hour, park it over night, and no leak. A day or two later a wet spot appears under the tractor directly below where the pump meets the rear end.

Everything is clean, and it is not leaking from any of the seals I replaced or the relief valves. I inspected the housing for cracks, and did not see anything.

I did the same repair on my other 149, and she does not leak a drop…

Any suggestions? Should I double up on the gaskets?

If you have replaced it three times and it still leaks, that's probably not where the leak is. The suction tubes sometimes leak...... Are you SURE that it's leaking at that gasket, or there is just oil on the floor in the same location? :bigthink: Run it till you can look under the machine and see it dripping. Then pull the tunnel cover off and even fenders if you have to ..... I'd say you'll find it leaking somewhere else.

I was starting to think that might be the issue, but I wrapped the threads on the suction tubes with tread tape. Plus I can feel the Hytran on the face of the rear end, just below where that gasket is...

And why will it not leak for two days, then start leaking again?

check hydro valves they leak as well

Run it two more days and see if it quits..... :bigthink: :biggrin2::biggrin2:

did u ever get this to stop leaking id really like to know thanks ronnei

No. It is still leaking! What a pain.

I now believe it is leaking from the expansion plug, part #29 in the attached photo.

the reason im asking ive got a 782 that starts as a leek then just starts bleeding

I have actually pinpointed my leak to that expansion plug. I put some gasket sealer around the bottom of it, and it slowed the leak quite a bit. I will do a better repair next spring, because I have the thrower on it now and the leak is not too bad.

I don't know if you have the same rear end on your 682. I believe some of the later model 82 series did not have the cast iron rear end. I could be mistaken. I am not an expert.

If you have the cast iron rear end, then that plug is definitely something to check.

regarding replacing the expansion plug- do I need to tap on it from inside the gearbox to get it out?

Have my leak narrowed to this or the "hydro cork gasket" and going to do both since I have it all apart

thanks