Hi, I am new to this site and I am looking for some help. I have a lomart pump and sand filter system for a 24ft round above ground pool. I am not sure what type or how old it is, it came with my house when I bought it. When I went to open my pool this spring my pump wouldn't start, it would only hum. My husband took it apart and lubed the shaft because it had seized and it seemed to be working fine. Now when I shut it off it makes a squeeking noise and I am not getting any pressure from the return into the pool or no suction at the skimmer. Any suggestions would be helpful.