The pump motor windings are shorted out. It must be replaced with a new pump motor.
SOURCE: Problems with Intex Krystal Clear Model 635 Pool Filter Pump 1500
No, the pump should not be noisy. It sounds like you have picked up a foreign object in the pump housing. you may have to pull the face off to determine. OR the pump/motor is indeed defective and should be returned.
SOURCE: Pump hums when switched on but does not work more than 20 seconds
hi i had the same problem with my booster pump motor it hum but did not turn. to make a long story short see if there is a metal cap on the back of your motor if there is pry it off and you should get to see the shaft turn the shaft with a screwdriver if it has a notch in it or if it don't turn the shaft anyway you can and make sure it turns easy. my shaft was tight as hell but i got it to turn and it started right up again and i had no problem. the hum means it is stuck and it shuts off because the breaker is tripping and after a few seconds it will click back on again, hope this helps
SOURCE: Need Intex Pump model #635 impeller
You know, I have made some amazing repairs on plastic items using nothing more than a soldiering iron! If you have the piece that broke off, you can carefully melt it back together. You can add more to the weld if you match the type of plastic but not too much or you imbalance it. In this case it looks like PVC. To repair it without the missing piece, form it out of epoxy putty, roughly shape it just before it sets up solid, & sand to finish.
SOURCE: Whirlpool Pump - Hums, no water flow...
The impeller and/or motor shaft is stuck or seized. If accessible you can try rotating the motor shaft with a visegrip plier or similar tool to see if it will come lose. Otherwise you should consider having the pump taken out and overhauled. Often the shaft seal begins leaking and result in water damage to the motor bearings. Bearings can be replaced, but compare labor and parts for overhaul to simply replacing the whole pump.
SOURCE: New Intex FP621 4000 Pool Pump Noisy
I have a 16 x 48 intex pool with the 1inch inlet and outlet. I purchased the intex 4000 pump. The attachments are too big for the inlet and outlet so i then purchased the adapters. The plungers are very noisy and allow air to get into the pump. I removed them and hooked the hoses up to the adapters directly. That worked as long as the adapters were new. This year the seal comes loose and allows air to get into the pump. I even tried allowing the top nut to be loose to allow air to escape. This year nothing works. The pump is just too strong for the holes. I was considering cutting the holes bigger and glueing seals on there but i was concerned about creating weak spots in the pool. I am tired of spending money on it so i did the redneck thing. I can say that because well, you might consider me one. I took the inlet hose off the connector and plugged the hole with one of those little black things. I took the hose and run it up through the hole in between the liner and the poles and down into the pool. If you run it over the top it will not work correctly. Take the hose and tie them together between the two sides as best you can to keep the hose in the pool. If you look at the smaller intex pools that dont have holes, that is how they have the pump hooked to the pool. VOILA! You have an airtight inlet to the pump. You do not need to do that to the outlet because its not sucking water its just pushing it. So, just hook the hose up as you wish. When you need to clean the filter, I put wash clothes in the hoses to plug them and voila. No air gets into the filter. Done! It is actually keeping my pool clean this year. Also, i purchased one of those aqua vacuums and it does work great for this pool. Once you get the big stuff, sweep it with a pool broom and the filter will do its job. You can vacuum these pools with the filter type pumps. Next time, i will purchase a sand filter and be done with it. Happy swimming with less work.
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