Pump motor bearing size

West Coast

Member
May 20, 2020
5
Baldwin County, AL
My equipment is 6.5 years old and evidence shows it is time to start replacing rubber gaskets. While doing so on the pump unit, I figured I might was well open up the motor and replace the shaft bearings for preventative maintenance. Problem is, I cannot find a whisper of intel on the bearings for this motor, or even about the motor itself, other than what is on the label. I could pull the bearings and mic them and order something, but that path is frought with inefficiencies and potential hazards. The motor label is attached, it is mounted to a Sta-Rite Supermax P/N 351097. I doubt the motor internals are on the unique end of the spectrum. The bearings have not failed, and the Supermax is not leaking. If anyone knows of, or might be able to sleuth out, a proper bearing set for this motor and let me know what they are, I would appreciate it.
 

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West Coast

Member
May 20, 2020
5
Baldwin County, AL
6203 bearings were it. I ordered Nachi 6203-2NSE9C3 bearings from a CNC supplier in Wisconsin, I paid a little extra using this supplier to ensure I got what I ordered. These replaced the original NSK 6203DW bearings, which have been in service since August 2013 and appeared to still be in good condition, so I would recommend those. I sheared a motor housing through bolt during disassembly. I bought a 3/16" rod at the local big box housing store and my buddy cut M5x0.8 threads on both ends of it, the result was a fine replacement for the broken through bolt. I also installed a US Seal PS-200. I did not need to remove the rear of the motor nor the terminals nor the capacitor housing to do the job. I eplaced all the rubber seals on the SuperMax while I was at it, it seems to be working fine. Considering evidence on the bolts, shaft, housings, etc. my assessment was that the repair was timely for my system, which I would consider to be gently used though it sits outside on a slab in one of the wettest regions in the US.