6
Pump Motors
Level 2
A.O.Smith
Replacement
Motor
Selection
Thru Bolt
Round Flanged Keyed
Round Flanged Threaded
Square Flange
REPLACEMENT MOTOR SELECTION
The nameplate on the motor being replaced
contains much of the critical information needed
to select a new motor. Some of the nameplate
data detailed in the Replacement Module is
repeated below in order to reemphasize its impor-
tance to the application.
Choosing the right replacement motor is easy
using these 5 steps:
1.
Know which end frame you need.
Is it:
2.
Know the total horse-
power output.
Find it on the motor's name-
plate. Use this equation:
The total horsepower times
(x) the service factor of the
replacement motor must be
equal to or greater than that
of the original motor being
replaced.
3.
Is the original motor single or three phase?
The original and replacement motors must be the
same unless the power supply is being changed.
4.
What is the correct voltage?
The operating voltage of the replacement motor
must match the voltage of the original motor. A
single voltage motor is an acceptable replacement
for a dual voltage motor and vice versa.
5.
What is the motor's cycle or hertz?
As a general rule, 50-cycle motors should not be
substituted for 60-cycle motors and vice versa.
