Browning 1028430 Single Groove Sheave 1-1/8 Bore 4-3/4 Od

Product Description

The BROWNING 1028430 is a finished bore single groove sheave designed for use with V-belt drive systems in HVAC, industrial, and mechanical applications. Manufactured from cast iron, this sheave features a 1-1/8 inch bore diameter and a 4-3/4 inch outside diameter, with a belt pitch diameter of 4.0 inches for 4L or A-series belts. The overall length through bore measures 1-5/32 inches and the face width is 7/8 inch. Licensed HVAC technicians, millwrights, and mechanical contractors install this type of sheave on fan and blower drive assemblies where a single V-belt is required.

This sheave is suited for single-groove belt drive configurations found in residential and light commercial HVAC blower assemblies, exhaust fans, and general-purpose motor drive systems. The finished bore is ready for direct shaft installation without additional machining. The cast iron construction provides durability in continuous-duty rotation environments typical of air handler and rooftop unit fan sections.

Key Features

• Finished bore at 1-1/8 inches — no additional machining required for standard shaft installation
• 4-3/4 inch outside diameter with 4.0 inch pitch diameter for 4L or A-series V-belts
• Single groove design for straightforward single-belt drive configurations
• Cast iron construction for durability in continuous-duty rotating applications
• Face width of 7/8 inch suits standard V-belt groove geometry
• Belt pitch B diameter of 4.4 inches for B-series belt reference

Compatibility

Designed as an OEM-style replacement or direct-fit sheave for single-groove V-belt drive assemblies using 4L, A, or B-series belts on fan and blower motor shafts with a 1-1/8 inch shaft diameter.

Installation Notes

Installation should be performed by a qualified HVAC technician or mechanical contractor. Disconnect and lock out electrical power to the motor before removing or installing any sheave or belt. Ensure proper sheave alignment using a straightedge or laser alignment tool before tensioning the belt to manufacturer-recommended deflection. Inspect the shaft keyway and set screws for wear before seating the sheave.