Browning 1028489 Single Groove Sheave 1 in Bore Cast Iron

Product Description

The BROWNING 1028489 is a finished bore single groove sheave designed for V-belt drive systems in HVAC, industrial, and mechanical power transmission applications. Manufactured from cast iron, this sheave features a 1 inch finished bore and a 4.95 inch outer diameter, making it a ready-to-install component without additional machining. With a belt pitch diameter of 4.6 inches and a groove width of 0.875 inches, it is sized for standard B-section or 4L-section V-belts. HVAC technicians and mechanical contractors install this sheave on blower and fan drive assemblies where precise belt alignment and durable construction are required.

This sheave is suited for single-belt drive configurations found in residential and light commercial air handling units, belt-drive blowers, and general power transmission setups. The finished bore accepts a 1 inch shaft directly, reducing installation time on standard motor or driven-shaft applications. The cast iron construction provides the mass and rigidity needed for stable operation under continuous belt load. The 4L or A-section belt compatibility makes it interchangeable with a wide range of drive systems using standard V-belt profiles.

Key Features

• Finished 1 inch bore — no additional machining required for standard 1 inch shafts
• 4.95 inch outer diameter with 4.6 inch belt pitch diameter for accurate drive ratio calculation
• Single groove design accepts standard B-section or 4L-section V-belts
• 0.875 inch groove width for proper belt seating and alignment
• Cast iron construction provides durability and dimensional stability under load
• Overall bore length of 1-5/32 inches for adequate shaft engagement

Compatibility

Designed as an OEM-style replacement or direct-fit sheave for single-groove V-belt drive systems using 4L or A-section belts with a 1 inch shaft bore requirement.

Installation Notes

Installation should be performed by a qualified HVAC technician or mechanical contractor. Disconnect and lock out all power to the drive system before removing or installing sheaves. Ensure the shaft is clean and free of burrs before pressing the sheave into position, and verify belt tension and alignment after installation per the belt manufacturer's guidelines. Do not overtighten set screws beyond standard practice for the shaft diameter.