Browning 1045855 Variable Pitched Sheave 2 Groove

Product Description

The BROWNING 1045855 is a 2-groove variable pitched sheave designed for use with V-belt drive systems in HVAC, industrial, and mechanical equipment applications. With a 5/8 inch bore and a 3.95 inch outside diameter, this sheave allows field adjustment of belt speed ratios without replacing the sheave entirely. Sheave thickness is 3 inches and face width ranges from 1-3/8 to 2 inches. It is compatible with multiple belt cross-sections, making it a versatile component for blower and fan drive assemblies. Licensed HVAC technicians and mechanical contractors are the primary installers.

This variable pitched sheave is suited for residential and light commercial HVAC air handling equipment, particularly blower and fan assemblies where airflow adjustment is required without motor replacement. The ability to accept belt sections 3L, 4L, A, 5L, and B makes it adaptable across a range of drive configurations. It is commonly used in belt-driven supply fans, return air blowers, and similar rotating equipment where pitch diameter adjustment provides a simple method to tune CFM output or motor load.

Key Features

• 2-groove design accepts belt sections 3L, 4L, A, 5L, and B
• Variable pitch allows field adjustment of drive ratio without sheave replacement
• 5/8 inch bore fits common motor and blower shaft sizes
• 3.95 inch outside diameter suitable for compact drive configurations
• Face width range of 1-3/8 to 2 inches accommodates pitch diameter variation
• Sheave thickness of 3 inches provides stable belt engagement

Compatibility

Compatible with V-belt drive systems using 3L, 4L, A, 5L, and B belt sections. Pitch diameter ranges vary by belt type: 3L belts accept 2.5 to 3.3 inches, 4L or A belts accept 2.6 to 3.6 inches, and 5L or B belts accept 2.9 to 3.9 inches. Designed as a variable pitch replacement sheave for belt-driven blower and fan drive assemblies requiring adjustable speed ratios.

Installation Notes

Installation is typically performed by licensed HVAC technicians or mechanical contractors. Disconnect and lock out all power to the equipment before removing or installing any sheave or belt drive component. Verify that the bore size and belt section are matched to the existing drive shaft and belt before installation. Follow ANSI and local mechanical codes for V-belt drive alignment and tensioning procedures.