Lovejoy 68514427833 Variable Speed Pulley 1 Hp

Product Description

The LOVEJOY 68514427833 is a spring loaded variable speed pulley designed for belt-driven systems in HVAC and industrial fan applications. Part of the Econoline series, this pulley features a 5.65-inch maximum diameter, a 2.69-inch minimum pitch diameter, and a 4.13-inch face length. It accepts a 3/4-inch bore with a 3/16 x 3/32 inch keyway for positive shaft engagement. The spring-loaded design allows the drive ratio to shift automatically with load changes, making it well suited for variable air volume and multi-speed blower configurations. Licensed HVAC technicians and mechanical contractors are the primary installers.

This pulley is intended for use on belt-driven blower and fan assemblies in commercial and residential HVAC systems where variable speed operation is required without electronic speed controls. It is rated at 1 HP at 1750 RPM and 3/4 HP at 1150 RPM, covering the typical operating range of packaged rooftop units, air handling units, and belt-drive furnace blowers. The B-belt trade size designation means it pairs with standard B-section V-belts. The 6-inch outside diameter and 3/4-inch bore keep it compatible with common blower shaft sizes found in light commercial equipment.

Key Features

• Spring-loaded variable speed design automatically adjusts drive ratio under changing load conditions
• Rated 1 HP at 1750 RPM and 3/4 HP at 1150 RPM for light commercial and residential belt-drive applications
• 3/4-inch bore with 3/16 x 3/32 inch keyway for secure shaft mounting
• Compatible with standard B-section V-belts
• Econoline series construction balances cost and durability for replacement applications
• 4.13-inch face length and 5.65-inch maximum pitch diameter accommodate common blower configurations

Compatibility

Designed for use with B-section V-belts on belt-driven blower and fan assemblies requiring variable speed operation. Consult equipment documentation to confirm bore size, keyway dimensions, and pulley diameter requirements before ordering.

Installation Notes

Installation should be performed by a qualified HVAC technician or mechanical contractor. Disconnect and lock out all electrical power to the air handling unit or furnace before beginning work. Verify shaft diameter, keyway dimensions, and belt cross-section against equipment specifications prior to installation. After mounting, check belt tension and pulley alignment according to the equipment manufacturer's guidelines before returning the system to service.