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