Link to AO Smith Swimming Pool Pump University Guide
Talks about motor types, how a pool water pump works, replacement motor selection, voltage, Service Factor, capacitors, and other stuff. The motor trouble shooting guide is very helpful.
It does come with a warning:
This is not a guide for the do-it-yourselfer.
These tips and suggestions are offered for persons with proper qualifications and necessary test equipment.
Here's the trouble shooting overview:
FAILURE TO START (MOTOR MAKES NO SOUND)
■ Check voltage at motor line terminals. Voltage should correspond with motor nameplate rating (+10%).
■ Check all electrical connections at the motor terminal
■ If no voltage is present; check fuses, timers & switches.
■ Protector tripped — wait until motor cools then restart —
check protector for continuity.
FAILURE TO START (MOTOR HUMS OR ATTEMPTS TO START)
■ Check voltage at motor line terminals. If
voltage is inadequate to start motor, check for
loose connections, undersized wiring, overloaded circuit or other causes of voltage drop.
■ Start switch contacts not closed when motor
is not operating. Switch may require adjustment. Switch contacts dirty or pitted.
■ Capacitor (where used) is “shorted” or “open”.
■ Check motor windings for “open” or “short”.
■ Check for continuity through protector.
■ Turn the motor shaft by hand to get the “feel”
of the motor. If the shaft feels tight or
doesn’t turn smoothly:
• Check the bearings for smooth operation.
• See if there is evidence of the rotor
striking the stator.
• Check for internal corrosion, cracked end
frames, clogged fan or other obstruction
within the motor.
• Check pump for obstructions, binding
impeller, or bent shaft.
It discusses and shows pictures how to do voltage measurements, adjust the start switch, ground check, Winding continuity checks, capacitor checks, and pump disassembly. The manual is pretty indepth explains/shows images on how to replace bearings (give the sizes and bearing numbers), and a plethora of other general information.
Hope you find it useful and made into a sticky.