Browning 3694478 Qd Bushed V Belt Sheave 4 Groove

Product Description

The BROWNING 3694478 is a four-groove, QD bushed V belt sheave designed for power transmission applications in HVAC, industrial, and mechanical systems. The sheave accepts a Quick Detach (QD) bushing with a bore range from 5/8 inch to 2-1/4 inch, allowing field adaptation to a variety of shaft sizes without replacing the sheave body. The outside diameter measures 5.48 inches, and the belt pitch diameters are 4.8 inches for A-section belts, 5.2 inches for B-section belts, and 5.3 inches for 5V-section belts. At 7.6 pounds, it is a solid-duty component installed by HVAC technicians and millwrights on air handling units, fans, blowers, and related belt-drive equipment.

This sheave is suited for residential and commercial HVAC applications where multi-groove belt drives are required on blower assemblies, supply fans, and exhaust fans. The QD bushing system simplifies installation and removal during scheduled maintenance or drive replacement. The four-groove configuration supports matched belt sets, which distribute load evenly and reduce belt wear in high-cycle or continuous-duty fan applications. Technicians working on rooftop units, air handlers, and industrial ventilation equipment will find this sheave a standard fit for many common drive configurations.

Key Features

• Four-groove configuration supports matched V belt sets for balanced load distribution
• QD bushing style B allows bore sizing from 5/8 inch to 2-1/4 inch for flexible shaft fit
• Outside diameter of 5.48 inches suits common blower and fan drive assemblies
• Compatible with A-section, B-section, and 5V-section V belts via respective pitch diameters
• Solid construction at 7.6 pounds supports continuous-duty power transmission loads

Compatibility

Designed as an OEM-style replacement or upgrade sheave for four-groove V belt drive systems using QD bushing style B, compatible with A-section, B-section, and 5V-section V belts on blowers, fans, and air handling units.

Installation Notes

Installation should be performed by a qualified HVAC technician or millwright. Disconnect and lock out all power to the drive system before removing or installing any sheave or bushing. The QD bushing must be sourced separately and matched to the required shaft diameter within the stated bore range. Verify belt tension and sheave alignment with a straightedge or laser alignment tool after installation to prevent premature belt and bearing wear.