Gould J5S Pump Pressure Gauge Bounces

[chocophile]

I have a Gould J5S drawing water from a lake, and a plumber recently told me I may need to have the pump rebuilt because the pressure gauge bounces wildly when the pump is running. The pump sounds like it's struggling at the end of the running period before shut-off.

My recollection is that the gauge used to climb smoothly to shut-off (years ago). The gauge and pressure switch are new.

The pump is about 15 years old, but only gets seasonal use in summer. The pump is drained for winter, and always starts up well in the spring after priming.

The motor itself seems fine.

I've done various plumbing and mechanical work successfully, and I'm thinking about rebuilding the pump.

Any suggestions regarding needed parts and tricks? Is there a rebuild kit? Or, does this kind of job require more expert skills.

Thanks!

[dlamp67]

Sir, if the pump is that old, I would first replace the impeller, diffuser, nozzle and venturi. This will basically rebuild the pump end. Air can also cause a gauge to jump around, although, with your comment stating that it is taking longer for the pump to build pressure and shut off would lead me to believe the pump is wore out, or , you have an issue with the water supply to the pump.

[chocophile]

Would I also need the P/N 10K10 seals? Thanks very much for your quick response. -Alan

[dlamp67]

It wouldn't hurt, although, if the pump is not leaking at the seal and you are careful when replacing the impeller, you shouldn't need a new seal.