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B121 Pool Pump Motor 56C Frame 3/4 HP Keyed Shaft 115V/230V

Availability: In Stock

Regular Price: $229.99

Sale Price $184.99

You Save: $45.00  (19%)

Quick Overview

The AO Smith B121 Pool Pump Motor is a 3/4 horsepower Keyed Shaft style motor with a 56C Frame. The B121 Motor is dual voltage (115V or 230V) and has a 1.5 service factor.

Keyed Shaft style motors are most commonly used on American Products (Pentair) Hydro Pumps, Aqua-Flo Dominator, A Series, AC Series pumps, Sta-Rite CF6 Series and CFA Series pumps, Premier 455 Series pumps and Swimquip XL-VI and XL-VII Series pumps.


It is important to know that pool pump motors are not manufactured by the pump manufacturer, the motor will usually be manufactured by AO Smith, Magnetek or Centurion. Your pump's motor should have a label or faceplate on it which includes the information you need to replace your pump motor. The most important categories to note will be the horsepower (hp), motor frame (fr), voltage and service factor (sf). Some labels will provide you with a model number and it will usually be listed as CR or CAT.

  • 3/4 HP
  • 1.5 Service Factor
  • 115 / 230 Volt
  • 12.0 / 6.0 amps
  • 3450 RPM
  • 56C NEMA Frame
  • Keyed Shaft


Cross Reference: C48J2DA142, C48J2DA153, C48J2DB142, C48J2DB153, C48J2DB157, C48J2DB158, C48J2DB159, C48J2N100, C48J2N113, C48J2N116A5, C48J2N120, C48J2N120A1, C48K2D5C1, C48K2DA128, C48K2DA141, C48K2DA147, C48K2DA5C1, C48K2DB141, C48K2N100, C48K2N101, C48K2N103, C48K2N109, C48K2N114, C48K2N115, C48K2N117, C48K2N117A2, C48K2N117A4, C48K2N117A5, C48K2N117A6, C48K2N117B1, C48K2N121, C48K2N122A1, SK1072, 164438, B133, B625, M602, C1094, C489, EB121, 14155, 14663, 15390, 8-164438-20, 5KC33MN2526X, 5KC33MN2526BX, MGT605092, 816429824, 7-164298-24

When replacing your pool pump motor you should always replace the shaft seal as well. The shaft seal is a 2 part piece made of rubber, metal and ceramic and keeps water from entering the pump motor. It is located near the impeller at the end of the motor shaft. Shaft seals vary between pumps so be sure to order the appropriate shaft seal for your pump.

Additional Information
Delivery Time 2-5 Business Days
Manufacturer AO Smith
Technical Specs

Model: B121
Style: Keyed Shaft
Frame: 56C NEMA
Horsepower: 3/4 HP
RPM: 3450
Voltage: 115V / 230V
Amperage: 12.0 / 6.0 amps
Warranty: 1 Year from date of install

SKU MGT-60-5092
Manufacturer Part # B121
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