Lau G078052221 V-belt Pulley 4.95 in Od 1 in Bore 1-groove

Product Description

The LAU G078052221 is a single-groove V-belt pulley designed for use with 3L and 4L fractional horsepower belt drives. It features a 4.95-inch outside diameter and a 1-inch bore, with a solid web spoke construction that balances rotational mass while keeping the assembly lightweight. The pitch diameter measures 4.36 inches for 3L belts and 4.7 inches for 4L belts. This pulley is a standard replacement component used in HVAC blower assemblies, exhaust fans, and light industrial fan drives where fractional horsepower belt-driven systems are specified.

This pulley is suited for residential and light commercial HVAC applications, including belt-drive blower assemblies in air handlers, furnaces, and ventilation fans. It accepts both 3L and 4L V-belt profiles, giving technicians flexibility when sourcing replacement belts in the field. The 1-inch bore fits standard fractional horsepower motor shafts commonly found in these systems. Installation is performed by licensed HVAC technicians or qualified mechanical service personnel as part of routine blower section maintenance or belt-drive rebuild work.

Key Features

• 4.95-inch outside diameter for use in fractional horsepower belt-drive systems
• 1-inch bore fits standard motor and blower shafts
• Single-groove design accepts 3L and 4L V-belt profiles
• Pitch diameter of 4.36 inches (3L belt) and 4.7 inches (4L belt) for accurate drive ratio calculation
• Solid web spoke construction provides a durable, balanced rotating assembly

Compatibility

Designed as an OEM-style replacement V-belt pulley for belt-driven HVAC blower assemblies and ventilation fan drives using 3L or 4L fractional horsepower V-belts with a 1-inch bore shaft.

Installation Notes

Installation should be performed by a qualified HVAC technician or mechanical service professional. Disconnect and lock out all electrical power to the unit before removing or installing any drive components. Verify bore fit and set-screw engagement on the shaft before tensioning the belt, and confirm belt alignment across both sheaves to prevent premature belt and bearing wear. Follow equipment manufacturer specifications for proper belt tension.

Technical Specifications

• Outside Diameter: 4.95 inches
• Bore Diameter: 1 inch
• Number of Grooves: 1
• Compatible Belt Types: 3L, 4L
• Pitch Diameter (3L Belt): 4.36 inches
• Pitch Diameter (4L Belt): 4.7 inches
• Construction Type: Solid Web Spoke

Standard Information

• Brand: LAU
• Manufacturer Part Number: G078052221