Browning 1045988 Variable Pitched Sheave 2 Groove

Product Description

The BROWNING 1045988 is a two-groove variable pitched sheave designed for adjustable belt drive systems in HVAC, industrial, and mechanical equipment applications. With a 1 inch inside bore diameter and a 5.35 inch outside diameter, this sheave allows field adjustment of drive speed ratios without replacing the entire drive assembly. The sheave thickness is 3 inches and the face width ranges from 1-3/8 to 2 inches. It accepts 3L, 4L, A, 5L, and B section V-belts, making it compatible with a wide range of standard belt configurations. Licensed HVAC technicians and mechanical contractors rely on variable pitch sheaves to fine-tune blower speeds during system balancing and commissioning.

This sheave is suited for residential and light commercial HVAC air handling units, blower assemblies, and fan drive applications where airflow adjustment is required after installation. Variable pitch sheaves are commonly installed on supply fan drives in air handlers, rooftop units, and duct furnace blower sections. The adjustable pitch diameter range allows the installer to dial in the correct CFM output without cutting new belts or sourcing fixed-bore sheaves. This part ships as a single unit and is intended for installation by qualified mechanical or HVAC technicians familiar with belt drive systems.

Key Features

• Two-groove configuration accepts 3L, 4L, A, 5L, and B section V-belts
• 1 inch inside bore diameter for compatibility with standard shaft sizes
• 5.35 inch outside diameter with 3 inch sheave thickness
• Face width adjustable from 1-3/8 to 2 inches for variable pitch operation
• Pitch diameter range: 3.9 to 4.7 inches for 3L belts, 4.0 to 5.0 inches for 4L or A belts, 4.3 to 5.3 inches for 5L or B belts
• Allows on-site drive ratio adjustment without full drive replacement

Compatibility

Designed as an OEM-style replacement or upgrade sheave for belt drive systems using 3L, 4L, A, 5L, or B section V-belts with a 1 inch bore shaft.

Installation Notes

Installation should be performed by a qualified HVAC technician or mechanical contractor. De-energize and lock out the equipment before servicing any belt drive components. Ensure the sheave is properly aligned with the mating sheave using a straightedge or laser alignment tool before tensioning the belt. Refer to the belt manufacturer tensioning guidelines and applicable IFGC or mechanical code requirements for the installation jurisdiction.