Product Overview

The Century Centurion® Pro HSQ165 Pool & Spa Pump Motor is a professional-grade 1.65 Total Horsepower, single-speed replacement motor designed for compatible in-ground pool and spa pumps requiring a 48Y square-flange motor with a threaded shaft.

Operating at 3450 RPM, the HSQ165 supports either 115V or 230V single-phase power, making it a versatile replacement option for many common residential pool pump applications.

Century’s Centurion Pro platform incorporates installer-friendly features including an improved terminal board, simplified voltage-selection device, easy shaft access, premium sealed ball bearings, and a rugged hybrid end-frame design.

Key Features & Benefits

• 1.65 Total Horsepower – Designed for compatible pumps requiring a 1.65 THP motor.
• Single-Speed Operation – Runs at approximately 3450 RPM.
• Dual Voltage – Can be configured for 115V or 230V operation.
• 48Y Frame – Common square-flange pool pump motor configuration.
• Square Flange Mounting – Designed for compatible square-flange pump seal plates.
• Threaded Shaft – Accepts compatible threaded pool pump impellers.
• Single-Phase Motor – Designed for standard residential electrical service.
• Automatic Thermal Protection – Helps protect the motor against overheating.
• Open Drip-Proof Enclosure – Provides motor ventilation and cooling.
• Sealed Ball Bearings – Premium bearings at both motor ends help support reliable operation.
• Installer-Friendly Terminal Board – Provides improved access for wiring.
• Easy Voltage Selection – Century’s voltage-change device simplifies 115V/230V configuration.
• Continuous Duty Rated – Designed for normal pool circulation applications.

Specifications

The core specifications above are confirmed by current Century distributor data for HSQ165.

115V / 230V Dual-Voltage Operation

The HSQ165 can operate on either:

115V – approximately 18.8 amps

or

230V – approximately 9.4 amps

The motor must be correctly configured for the actual incoming electrical supply before operation.

The Century Centurion Pro platform incorporates a dedicated voltage-selection device designed to reduce wiring errors during installation.

48Y Square-Flange Design

The 48Y frame with square flange is commonly used on many in-ground pool pump wet ends.

Compatibility depends on more than horsepower alone.

Before ordering, verify:

• Existing motor frame
• Square-flange mounting style
• Total horsepower
• Voltage
• Shaft type
• Pump manufacturer and model
• Impeller requirements

A motor can have the correct horsepower but still be incompatible if the frame, flange, or shaft configuration does not match.

1.65 THP Rating

The HSQ165 has:

Rated Total Horsepower: 1.65 THP

Service Factor: 1.0

When replacing an existing pool pump motor, Total Horsepower is more important than simply comparing the nominal horsepower printed on an older motor label.

The replacement motor should meet the hydraulic load required by the existing impeller.

Threaded Stainless Steel Shaft

The HSQ165 uses a threaded 303 stainless-steel motor shaft designed to accept compatible pool pump impellers.

The threaded-shaft configuration is standard on many modern residential pool pump wet ends.

Always inspect the existing impeller threads before installation and replace damaged components when necessary.

Centurion Pro Installer-Friendly Design

Century designed the Centurion Pro platform with several features aimed at simplifying pool motor replacement.

PCB Terminal Board

The larger terminal-board layout provides improved access for wiring and service.

Voltage Change Device

A dedicated voltage selector simplifies configuration between 115V and 230V.

Shaft Access

A clearly defined rear shaft-access point makes it easier to hold the motor shaft while removing or installing the pump impeller.

Premium Bearings

Century uses sealed ball bearings at both ends of the motor to support reliable operation.

Important: Replace the Shaft Seal

Whenever a pool pump motor is replaced, installing a new mechanical shaft seal is strongly recommended.

The mechanical seal prevents pool water from traveling along the motor shaft toward the bearings.

Reusing an old seal can result in:

• Water leakage
• Corrosion
• Bearing damage
• Premature motor failure

Shaft Seal Not Included

The correct shaft seal depends on the pump wet end, not the motor model.

To identify the proper seal, use the complete pump manufacturer and model number.

Motor Only

The HSQ165 listing is for the replacement motor only.

Unless specifically stated otherwise, it does not include:

• Pump housing
• Impeller
• Diffuser
• Mechanical shaft seal
• Seal plate
• Pump lid
• Pump basket
• Plumbing unions

These components belong to the existing pump wet end.

Common Reasons for Motor Replacement

The HSQ165 may be appropriate when the existing compatible motor exhibits:

• Loud bearing noise
• Motor humming but not starting
• Repeated thermal shutdown
• Seized bearings
• Shaft damage
• Burned motor windings
• Electrical failure
• Excessive vibration

Before replacing the motor, verify that the pump impeller and wet end rotate freely and that the problem is not caused by a clogged or damaged hydraulic component.

Installation Guidance

Pool pump motors involve line-voltage electricity and should be installed by a qualified pool professional or electrician when appropriate.

Before installation:

• Disconnect power at the breaker
• Verify incoming voltage
• Confirm motor configuration
• Replace the mechanical shaft seal
• Inspect the impeller and diffuser
• Check the pump housing and O-rings
• Confirm proper grounding
• Confirm proper bonding

After installation, verify that the pump primes correctly and that there are no leaks around the motor shaft or seal plate.

Frequently Asked Questions

What horsepower is the Century HSQ165?
It is rated at 1.65 Total Horsepower.

Is HSQ165 single speed or variable speed?
It is a single-speed motor operating at approximately 3450 RPM.

What voltage does it use?
It can operate on either 115V or 230V when properly configured.

What frame is HSQ165?
48Y square flange.

Does it have a threaded shaft?
Yes.

Is it single phase?
Yes.

How many amps does it draw?
Approximately 18.8A at 115V or 9.4A at 230V.

Does it include a shaft seal?
No. The correct seal depends on the specific pump wet end.

Should the shaft seal be replaced with the motor?
Yes. Installing a new mechanical seal whenever the motor is removed is strongly recommended.

Is this a complete pool pump?
No. HSQ165 is the replacement motor only.

What is the UPC?
786674069764.

Why Buy From Pool Supply Depot?

Pool Supply Depot supplies professional pool pump motors, complete pumps, mechanical shaft seals, impellers, filters, heaters, automation systems, lighting, salt systems, and replacement parts nationwide.

If you're unsure whether the Century HSQ165 is correct for your pump, provide the pump model number and the information from your existing motor label so the horsepower, voltage, frame, flange, and shaft configuration can be verified before ordering.

Order the Century Centurion Pro Pool Pump Motor, Square Flange, 1.65 THP, 1-Speed, 115/230V, 48Y Frame | HSQ165 from Pool Supply Depot today.