When you say a 2.0 pump, I assume you meant 2 HP. What model pump. The o-ring between back plate and pump housing has different part numbers for different pump.

How high are you trying to push the water to get to the top of the solar panels? How far from the pump are the panels and the pool?

Scott

stealth series JHP 2.0 HP. single story house so probably about 12ft up to the roof then slopes up. house faces north so solar panels are on the south and west roofs with all pool equipment along the east wall about 20 or so feet from where the solar pipes go up to the roof. pool is about 835 sf in area (35000gal). but, my basic question is if the seal/gasket/oring are bad, wouldnt it leak normally even without the increased solar heater pressure? I have no problem getting them replaced if thats really the problem.

I'm not sure but this is a weak point I have had with Jandy pumps in my neck of the woods in the past. It is one of the main reasons I prefer Pentair.

The back plate on this model pump isn't as beefy as the newer model pumps. It may be flexing a bit under the load. It could also be the body o-ring has flattened.

Its not hard to swap and not expensive. Six bolts and socket set with a long extension that reaches beyond the back of the motor. Might take you 15-20 minutes to swap. If it works, great, if not, then it might be something you can either live with or try a newer model, like an E-Pump.

Scott