My Jacuzzi 1UMF-S pump has low flow and low pressure. For this issue, I have ruled out all causes external to the pump. I have cleaned the pump internals including the impeller. The impeller is in good condition. What pump parts do I need to service to correct this issue. Thanks.
Pump Low Flow and Pressure
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- Last Post 14 September 2021
Did some more work on this pump. When I restrict the flow on the discharge line, the pump flow and pressure raise quickly to normal levels and maintains good flow and pressure after the restriction on the discharge line is removed. Not sure what to do next.
We'd be glad to assist you. Are the valves before the pump open so that the pump can pull from the skimmer and main drain? It's possible that the pump is struggling to get enough water to fully prime.
Here is a video regarding other plumbing issues that can lead to priming problems.
There is a diverter valve so the pump can pull from the skimmer or the bottom drain. I have spare pumps (Hayward SP3007X10A and a Jacuzzi 1MAG-U-S). I have swapped both these pumps with the Jacuzzi 1UMF-S (the pump with low flow and pressure). Both the Hayward SP3007X10A and the Jacuzzi 1MAG-U-S work fine. All pumps are 1 hp.
The issue has to be something in the pump. The motors don't slow down over time, so we can rule that out. You mentioned that you opened up the pump and cleaned out the impeller. The impeller was in good condition. We'll assume that the diffuser was in good shape.