Lau g078050175 Two-groove Pulley 4.25in Od 1.13in Bore

Product Description

The LAU g078050175 is a two-groove V-belt pulley designed for use in belt-driven HVAC blower and fan assemblies. It features a 4.25-inch outer diameter and a 1.13-inch bore, making it suited for standard shaft-mount applications in air handling and ventilation equipment. HVAC technicians install this type of pulley to connect the motor shaft to the blower wheel via V-belt drive, transmitting rotational force and allowing for airflow adjustment through pulley ratio selection. The two-groove configuration supports dual V-belt setups, which distribute load and reduce the risk of belt slippage under sustained operation.

This pulley is used in residential and light commercial HVAC systems where belt-drive blower assemblies are present. Typical installation scenarios include forced-air furnaces, air handlers, and packaged rooftop units equipped with belt-driven blower wheels. It is appropriate for any application requiring a two-groove pulley with a 4.25-inch OD and 1.13-inch bore that is compatible with standard V-belt sheave configurations.

Key Features

• Two-groove design supports dual V-belt drive for improved load distribution
• 4.25-inch outer diameter for use in common HVAC blower drive configurations
• 1.13-inch bore fits standard motor and blower shaft sizes
• Designed as an OEM-style replacement for belt-drive HVAC applications
• Single-unit packaging for straightforward field replacement

Compatibility

Designed as an OEM-style replacement pulley for belt-driven blower assemblies in residential and light commercial HVAC equipment requiring a two-groove sheave with a 4.25-inch OD and 1.13-inch bore.

Installation Notes

Installation should be performed by a qualified HVAC technician. Disconnect and lock out all electrical power to the unit before removing or installing any drive components. After mounting the pulley on the shaft, verify proper belt tension and pulley alignment before returning the system to service. Do not overtighten the set screw beyond the shaft manufacturer's recommended specification, and inspect belts for wear whenever a pulley is replaced.

Technical Specifications

• Outer Diameter: 4.25 inches
• Bore Size: 1.13 inches
• Number of Grooves: Two
• Box Quantity: 1

Standard Information

• Brand: LAU
• Manufacturer Part Number: g078050175