Pentair LA MS05 booster pump bearing question

Mar 5, 2019
Tallahassee, FL
Hi Guys,
I have a pentair booster running a Polaris in a 28 ft fiberglass pool. This was a new build <2 years ago.....
Suddenly, the booster motor became very loud. It still drives the Polaris easily.
I’m fairly handy and think I can replace the bearings if that is what it ends up being...
However, I’m struggling to find the bearing and seal part numbers. Who can I contact to get the part numbers and parts.
I will try to attach a video of the sounds and the motor ID plate.
Any advice appreciated.


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Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
Laughlin, NV
Try InyoPools. Though they may just have new motors and seal kits. Otherwise a motor shop should have the parts.


Aug 11, 2020
I just had mine quit about a month ago. It was three years old. I couldn't seem to find the parts either. I looked for the, "fan kit" ( #P ZBR43810 FAN KIT )locally with no luck. I pulled the fan grill off and noted the winding was hard to turn. So I just replaced the pump. You can actually stick a regular screw driver in and try and turn the shaft to see how stiff it is.


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