Part # 3285-81
Warranty 1 Year
Manufacturer Code B668
Century® (A.O. Smith) Letro Booster Pump Replacement Motor – 3/4 HP – B668 Key Benefits
✅ OEM Replacement — Designed as the direct motor replacement for Letro® booster pumps
✅ Reliable Power — 3/4 HP output delivers the proper performance for pressure-side cleaners
✅ Durable Build — Ball bearings and thermal overload protection extend motor life
✅ Quiet Operation — Balanced design reduces vibration and noise
Why Choose the Century® B668?
✅ Exact match for Letro® booster pump applications, ensuring proper fit and performance
✅ Built with high-quality materials to withstand demanding pool environments
✅ Backed by Century’s reputation for reliability in pool and spa motors
Tech Tips
⚠️ Always replace the pump shaft seal when installing a new motor to prevent leaks
✅ Confirm rotation and wiring voltage before installation (115/230V capable)
⚠️ Disconnect power at breaker before servicing motor or pump
✅ Mount motor on a solid, level base to minimize vibration and noise
Applications
✅ Designed specifically for Letro® booster pumps used with pressure-side pool cleaners
✅ Compatible with multiple booster pump housings requiring a 3/4 HP, 56J frame motor
❌ Not for standard filtration pumps (use appropriate full-rate or variable-speed motor instead)
Specifications
✅ Model: B668
✅ Horsepower: 3/4 HP
✅ Voltage: 115/230V
✅ Amperage: 10.8/5.4 A
✅ Speed: Single Speed, 3450 RPM
✅ Frame: 56J, C-Face Mount
✅ Enclosure: Open Drip Proof (ODP)
✅ Rotation: CCWPE (counter-clockwise pump end)
What’s Included
✅ Century® B668 3/4 HP Replacement Motor
❌ Shaft seal (must be purchased separately for leak prevention)
❌ Pump housing (reuse existing Letro® booster pump body)
Not California or New York Title 20 compliant.
What is Service Factor?
Reply
Service Factor(SF) is a multiplier that when multiplied by the horsepower of the motor indicates the total permissible horsepower loading that may be carried when the motor is operating at rated voltage and frequency. The most important thing to remember when replacing a motor is that the replacement motor's horsepower times its service factor must be equal to or greater than the original motor's horsepower times its service factor. The Service Factor rating can be found on the motor label. See Step 4 of our How to Read a Pool Motor Label guide.
Reply
If all I need to do is replace the booster pump will I need to purchase any more replacement parts that do not come with purchasing a new booster pump?
Reply
Hello Michael - The B668 (3285-81) is a replacement motor. You will need to replace the shaft seal (5250-106) if you are replacing the motor. If you decide to replace the complete pump (LA01N), you will not require any additional parts.
Reply
I have an old Century Pool&spa motor 1081. Part# 0-173840-23, 3/4 hp. Will this motor work to replace my old motor
Reply
Donnie - The correct replacement motor is B625 (3262-18).
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The Most Helpful Review
1 0
(5 out of 5 stars) Century Booster Pump
Reviewed By: Inyo Customer ()
Was easy install. I had to purchase new bolts because I could not remove one bolt from old motor due to corrosion. Once I had new bolts the install was easy. Much quieter that old motor.
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The Most Recent Reviews
(4 out of 5 stars)
Reviewed By: Inyo Customer ()
It fix my fixtures great
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1 0
(5 out of 5 stars)
Reviewed By: Susanne C. ()
As always great service and excellent quality product.
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(5 out of 5 stars) Exact Motor Replacement
Reviewed By: John G from Mineral Wells Tx ()
Pros: Hassle Free
Cons: cant think of any.
Exact replacement for my sweeper pump motor. Very good price, easy order, fast service , and excellent quality product.
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