When do you replace a pump?

[forensicdoc]

How can you tell is is time to replace a pump? All my pumps appear to be working fine. I take them apart and clean them seasonally. But they are pushing three years old. Do pumps gradually lose flow? Do you need to replace parts periodically? I do have a spare pump in case one pump dies for any reason.

Thanks for your replies!

 

[Shane Hoffman]

When the motor burns up is when it is time to replace the pump.......if it is something like a hammerhead or iwaki yu can keep it forever just replacing the pump and motor as they burn up......as far as replaceable parts...just replace them as they break (impellars/shafts/etc,)

The better you maintain them the longer you will go between replacements....