USMOTORS811757002 811757-002 Pump Motor 3/4 Hp

Product Description

The USMOTORS811757002 811757-002 is a 3/4 HP single-phase pump motor designed as a direct replacement for Armstrong circulator and pump applications. This motor delivers reliable rotational power to the pump assembly and is a core component in hydronic heating, cooling, and fluid-transfer systems. At 3/4 horsepower, it is sized for moderate-duty residential and light commercial pump loads. Licensed HVAC technicians and plumbers install this motor when the original unit shows bearing failure, winding damage, or thermal cutout trips that cannot be reset.

This motor is intended for use with Armstrong H-54, H-64, and S-57 series pumps. Those pump models are common in hydronic heating systems, chilled-water loops, and domestic water circulation applications. Installation is typically performed during a planned maintenance visit or as an emergency replacement when system flow drops due to motor failure. The motor mounts directly to the pump volute in the same footprint as the original, minimizing downtime during service.

Key Features

• 3/4 HP output rated for moderate-duty pump loads
• Single-phase power configuration for standard residential and light commercial electrical service
• Direct OEM-replacement design for Armstrong H-54, H-64, and S-57 pumps
• Drop-in fitment reduces labor time during replacement service

Compatibility

Designed as a direct replacement motor for Armstrong H-54, H-64, and S-57 series pumps.

Installation Notes

Installation should be performed by a licensed HVAC technician or plumber. Shut off electrical power at the disconnect or breaker and isolate the pump from the hydronic or water system before beginning work. Verify that supply voltage and phase match the motor nameplate before energizing. Follow applicable NEC requirements for motor branch circuit wiring and disconnect sizing.

Technical Specifications

• Horsepower: 3/4 HP
• Phase: 1 Phase

Standard Information

• Brand: USMOTORS811757002
• Manufacturer Part Number: 811757-002