- Does my pool pump actually need the impeller lock screw?
Now here’s your hosts – Matt and Rob.
“Do I need an impeller lock screw to secure the pool pump impeller?
-Douglass in Colorado Springs, CO
Well, we get this question all the time because most new motors do not have the internal threads for a lock screw. So, when pool owners get a motor, they’re a little concerned that their impeller lock screw has nowhere to go. But, we’ve discussed this with pool pump manufacturers and they’ve advised us that the impeller lock screw is no longer necessary for most pump designs because the new impellers will not dislodge for the motor shaft. So, toss the lock screw.
Well, there are some exceptions (a more in-depth explanation) because there are some old pumps that still need to use a keyed shaft as a joiner between the impeller and motor. You’d have to check to see when you’re replacing your impeller or pump motor to make sure you have the external threaded motor shaft. Make certain do not need that impeller lock screw before you throw it away.
But if you do have the outer threads, or the external threads on the shaft or the motor, you can toss that impeller screw because it’s a redundancy. If you want it in there, you can have it in there, it’s not going to affect anything. It’s not going to make your pump, pump more or less water. It’s kind of a safeguard.