A.O. Smith B2859V1 Replacement

Verified specifications

Up-rated vs full-rated: match total HP (THP = label HP × service factor), not label HP. Never replace a full-rated motor with an up-rated motor of the same label HP.

56Y fitment: square-flange mount — the Pentair WhisperFlo / Challenger / Pinnacle and Sta-Rite Max-E-Pro / Max-E-Glas / Dura-Glas class.

Single-speed and CA/NY: California and New York require variable-speed replacement motors (Title 20) for most pool pump replacements; see the VGreen Evo line. In other states, single-speed replacements remain standard.

Shaft seal: replace the pump shaft seal whenever the motor is changed — a leaking seal is the #1 killer of new pool pump motors.

Confirming the right replacement

Before we quote, compare these fields on your failed motor's nameplate. If any of them differ, send us a photo of the nameplate and we'll match it exactly rather than guessing:

• Full model number — including any suffix letters
• HP, RPM, and voltage
• Frame size (e.g. 284T) and enclosure (TEFC, ODP, etc.)
• Full-load amps

Other A.O. Smith models

• More A.O. Smith modelsBrowse every A.O. Smith model page we quote
• A.O. Smith B2852V13/4 HP up-rated 56Y pool motor, 0.94 THP
• A.O. Smith B2853V11 HP up-rated 56Y pool motor, 1.25 THP
• A.O. Smith B28402.5 HP up-rated 56Y pool motor, 2.6 THP