Browning 1045426 Variable Pitched Sheave 1 Groove 3/4 in Bore

Product Description

The BROWNING 1045426 is a single-groove variable pitched sheave designed for use with V-belt drive systems in HVAC, industrial, and mechanical equipment applications. It features a 3/4-inch bore and a 4-3/4-inch outside diameter, with a sheave thickness of 1-15/16 inches and an adjustable face width ranging from 11/16 to 1-1/16 inches. The variable pitch design allows the effective pitch diameter to be adjusted by opening or closing the sheave faces, which changes the belt's running position and alters the drive ratio without swapping components. This part weighs 2 pounds and is typically installed by HVAC technicians or mechanical contractors performing drive system setup or speed adjustment on belt-driven equipment.

This sheave is suited for residential and light commercial HVAC applications where a blower motor or fan drive requires pitch diameter adjustment for airflow balancing or speed tuning. It accepts belt sections 3L, 4L, A, 5L, and B, making it compatible with a wide range of standard V-belt sizes commonly found in air handling units, blower assemblies, and similar belt-driven equipment. The single-groove configuration is intended for single-belt drive arrangements.

Key Features

• Variable pitch design allows drive ratio adjustment without replacing the sheave
• Compatible with belt sections 3L, 4L, A, 5L, and B
• 3/4-inch bore fits standard motor and blower shaft sizes
• 4-3/4-inch outside diameter suitable for common HVAC blower drive configurations
• Adjustable face width from 11/16 to 1-1/16 inches for pitch diameter tuning
• Single-groove configuration for straightforward single-belt drive setups

Compatibility

Designed as an OEM-style replacement or service sheave for single-belt V-belt drive systems using 3L, 4L, A, 5L, or B section belts, typically found in belt-driven HVAC blowers and fan assemblies requiring a 3/4-inch bore sheave.

Installation Notes

Installation is typically performed by a licensed HVAC technician or qualified mechanical technician. Disconnect and lock out all power to the equipment before removing or installing sheaves. Ensure the bore is properly aligned with the shaft and that the set screw or bushing is secured before applying belt tension. After installation, verify belt tension and alignment per the equipment manufacturer's specifications before returning the unit to service.