It's the Great Pumpkin MightyRaze!

I know on brake lines you never reuse a cooper gasket, never heard doubling up on one, that would seem to promote a leak. Maybe the threads are stripped and they were trying not to engage them by spacing the plug further away?

Maybe it was just by accident and they forgot to remove the old one. Sort of like a double gasket an oil filter when the gasket sticks to the mounting surface.

JB_4x4 wrote:

I know on brake lines you never reuse a cooper gasket, never heard doubling up on one, that would seem to promote a leak.  Maybe the threads are stripped and they were trying not to engage them by spacing the plug further away?

Maybe it was just by accident and they forgot to remove the old one.  Sort of like a double gasket an oil filter when the gasket sticks to the mounting surface.

Or the gasket I didn't see on one of the pressure lines on the pump got put on the plug.

Yep, a possibility. If you have "OFRS" (?) , basically a flat surface that takes a seal (nitrite?), you do not use a cooper gasket, just the o-ring. I noticed that on my chinesium log splitter (which has worked great) it uses those instead of NPT and such. Was reading on surpluscenter that is the future of hydraulic hoses, not, NPT.

Of course most of the product surplus center sells uses NPT threads, especially the pumps.

Just an update:

I have been using the Kubota for mowing duty a bit.  It works very well, but still has that leak.  Haven't 100% pinpointed the actual leak yet.  I did replace the two brass washer/gaskets on the lines to the pump and that got rid of about 80% of the leaking.  I fear the rest is coming from where the pump is attached into the transaxle.  A full winter teardown may be in order.  And that looks like a big job.