| You need to use the jet assembly to allow the Sears pump to reach higher pressures.
The Jacuzzi may have looked a little different, but I'm betting it had a jet assembly in it. Look at the left side of the pump head (standing behind the motor). You should see a plastic plug towards the bottom. If that plug is there, that is the jet assembly. A jet pump withouit the shallow well adapter (the jet) is merely a centrifugal pump, which isn't made for higher pressures. If the Jacuzzi wasn't a jet pump, it was at least a multistage pump, which will produce higher pressures.
A little known secret about Sears pumps: They are underrated, as far as capacities go. Sears pumps are made by Pentair, which manufacturers jet pumps under the Sta-rite name. While the Sta-rite pump and the Sears pump look alike, a Sta-rite 1hp pump has a higher capacity because the 1 hp Sears pump has a 3/4 hp impeller in it. In other words, the 1 hp Sears pump is the same as a 3/4 hp Sta-rite. Not all pumps are created equal. The Sears 1 hp pump will not have as high a capacity like the old 1 hp Jacuzzi.
After all of that, install the jet assembly on the Sears pump and it will help it reach higher pressures. Also, adjust the precharged pressure tank to 2 psi less than pump cutin pressure.
Ron  |