I'm looking to replace my Hayward Superpump motor, since it seems that the bearings are shot & it's noisy as heck. I am considering the option of upgrading to a 2 speed motor.

Current Specs:
Part: SP1610Z1M
HP: 1.5
Frame: 56J
Service Factor: 1.0
KW: 1.10
Volts: 115/230
RPM: 3450

I'm looking at AO Smith replacement motors, but I'm getting confused with all the data. It seems most of these motors are switchless, so do I need to buy a hi-lo switch or is it really part of the motor? How do I know I am running at 115 or 230 volts? One of the AO Smith motors I am considering is a 2 spd, 1.5/.20 hp motor that runs at 3600/1800 rpm. Does the difference in RPM matter?

I'm getting so confused as to go back to a single-speed