You can purchase a 3/4HP, 10 GPM with a Franklin 2 wire motor for about 350 bucks. With prices that cheap, no one will pay for quality anymore. If I made a pump that could last 40 years and gave it a 20 year warranty, would you pay $1500.00 for it? Once people started looking for the cheapest price, manufacturers where happy to make it available. Now you may have to replace that cheap pump 10 times in the next 40 years. But just think of how many people in China and Mexico you are helping to support.
No small pumps are rebuild-able anymore.