LG Dishwasher Pumps
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After removing the pump, I disassembled it to find out why these fail so soon. It's a very poor design. I found that the nose of the electric motor, where the bearings are located, sits in a plastic cup formed by the top of the pump body. Any leakage from the pump around the motor shaft will be held in place against the motor bearing. It has no place to go. This causes rusting of the bearing. I expect I'll be replacing this one in a few years. :(
But kudos to PartsSelect for getting the right pump assembly for me, after getting the wrong one from another supplier!
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Digging deeper found the main board was fried. Replaced that. STILL ... Read more error.
Ended up replacing the whole sump assembly which includes all the parts I bought originally.
Moral: Pull the dishwasher out and check your sump motor before buying parts. Mine was obviously damaged as the sump had leaked and the motor was heavily corroded.