Pump works fine, but is very loud

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Question moved to correct category.

There is a video in the link that promises the codes, but it might be clickbait and an empty promise.

https://www.google.com/search?q=Sta-Rite+400+code+337

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How old is the heater?
When was the last time it worked correctly?
Does the pool reach the set point? If not, how close does it get?How long will the heater run (hours)?
What model pump are you using?

Probably a failing bearing in your motor. It can probably be repaired by your professional pool supply or a electric motor repair shop in your town. The question would be how long it will take them to get your motor back to you. You may want to ignore the noise until the end of your swim season, if you can. Another option is to replace the motor.

I hope this helps you ... thanks for your interest in FixYa.com

THIS IS MY FAVORITE PUMP, THERE IS A O-RING CLICK EBAY
BUT YOU NEED TO SEE IF ITS NOT THE SHAFT SEAL THAT'S LEAKING FIRST THIS IS THE SEAL THAT NEWER STA RITE REQUIRES CLICK EBAY .. READ THESE ADS THEY HAVE SOME GOOD INFO IN THEM .. DO NOT OVER TIGHTEN THAT STAINLESS STEEL BAND ! THERE IS A CHANCE OF CRACKING THE PUMP.. NOT COOL ! AND NEVER USE TREAD TAPE ON THE PLUMBING, IT BUILDS UP ON THE FITTING AND CAN CRACK THE PUMP.. SO THESE ARE THE FIRST THINGS I WOULD REPLACE ON THAT PUMP. AND REMEMBER TO PRIME THAT PUMP WITH WATER AFTER ANY PUMP REPAIR !!!! IF I WAS OF HELP JUST CLICK ON THE (YES) OR LEAVE A COMMENT .. I GLAD TO HELP . SEARCH MY OTHER SOLUTIONS ALSO .. JAY .. THE POOL PUMP REPAIR GUY IN LONGWOOD FLORIDA.. THE SIGN OF A BARK'N GOOD DEAL

More than likely, the bearings are going out on the motor. Usually you'll hear a loud screeching sound when this happens. You have 2 choices here. You can either take the pump to a local repair shop and have the bearings replaced, or you can replace the motor and pump seal. By replacing the bearings only, you're not guaranteed that the motor will last much longer. I always recommend replacing the motor and seal that way you'll be trouble-free for another 4-6 years.

More than likely, the bearings are going out on the motor. Usually you'll hear a loud screeching sound when this happens. You have 2 choices here. You can either take the pump to a local repair shop and have the bearings replaced, or you can replace the motor and pump seal. By replacing the bearings only, you're not guaranteed that the motor will last much longer. I always recommend replacing the motor and seal that way you'll be trouble-free for another 4-6 years.

NO ! YOU WILL HAVE TO GET IT SERVICED NEW BEARINGS AND SHAFT SEAL , ABOUT 75.00.. SEARCH YOUR AREA FOR YOUR LOCAL POOL PUMP MOTOR REPAIR GUY.. THIS A GREAT PUMP ! REMEMBER TO VOTE FOR YOUR FAVORITE FIXIT GUY ! THANKS JAY

debris may have gotten into pump or pump is air bound need to check pump first try to bleed pump if water comes out and not pumping hard possible burnt up impeller or seal