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Dayton 4RU77 cast iron centrifugal pump 3/4 HP 115/230V

Dayton

Dayton 4RU77 3/4 HP Cast Iron Centrifugal Pump 115/230V

SKU CH-7NPD-THVPJ MPN 4RU77

Cast iron centrifugal pump delivers up to 46 gpm at 20 ft head and 21 gpm at 80 ft head with 3/4 hp motor on 115/230V power

  • TypeDrain Components
  • Delivers up to 46 gpm at 20 ft head for strong flow
  • Maintains 31 gpm at 60 ft head for reliable pressure
  • Reaches 100 ft maximum head for high-lift applications
  • Cast iron housing resists corrosion for long service life
  • Dual-voltage 115/230V motor suits standard wiring

3/4 HP Cast Iron Centrifugal Pump

The Dayton 4RU77 is a single-phase centrifugal pump built with a cast-iron housing for durability in drainage and transfer applications. It delivers a maximum flow of 43 gpm and a maximum head of 100 ft, making it suitable for residential or light-commercial dewatering tasks. The 3/4 hp motor operates on dual-voltage 115/230V AC supply.

Voltage and Pipe Compatibility Check

Confirm your electrical service provides either 115V or 230V single-phase power and that the motor is wired for the selected voltage before installation. The pump requires a 1-1/4 in NPT intake connection and a 1 in NPT discharge connection, so verify existing piping matches these sizes and thread types. Ensure the open dripproof motor enclosure is appropriate for the intended mounting environment.

Cast Iron Housing and NPT Connections

The cast-iron pump housing resists wear from abrasive fluids and provides a rigid structure for permanent installations. NPT threads on both intake and discharge ports allow direct connection to standard iron or steel pipe without proprietary fittings. The open dripproof motor enclosure permits airflow for cooling but requires protection from direct water spray or flooding in daily operation.

Highlights

  • Delivers up to 46 gpm at 20 ft head for strong flow
  • Maintains 31 gpm at 60 ft head for reliable pressure
  • Reaches 100 ft maximum head for high-lift applications
  • Cast iron housing resists corrosion for long service life
  • Dual-voltage 115/230V motor suits standard wiring

Specifications

TypeDrain Components
BrandDayton
Model4RU77

Questions about this item

Does the pump include the 1-1/4 in NPT intake and 1 in NPT discharge fittings, or must they be purchased separately?

The specifications list compatible intake and discharge pipe sizes and NPT thread types, but the package contents are not detailed in the provided information.

Should I select the 115 V or 230 V wiring for a residential installation?

The motor is dual-voltage rated at 115/230 V AC single-phase, so you can wire it for whichever supply voltage is available at the installation site.

What flow rate can I expect at a typical 40 ft head in a real system?

At 40 ft of head the pump delivers a maximum of 40 gpm, with 46 gpm at 20 ft, 31 gpm at 60 ft and 21 gpm at 80 ft of head.

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