Lovejoy 68514427093 Variable Speed Pulley 0.5HP B Belt

Product Description

The LOVEJOY 68514427093 is a spring-loaded variable speed pulley from the Econoline series, designed for use with B-series V-belts in belt-drive power transmission applications. It features a 5-inch outside diameter, a 1.72-inch minimum pitch diameter, and a 4.65-inch maximum operating diameter. The bore measures 5/8 inch with a 3/16 by 3/32 inch keyway for positive shaft engagement. Rated at 0.5 HP at 1750 RPM and 0.333 HP at 1150 RPM, this pulley is suited for HVAC fan and blower drives where variable speed control is required. Licensed HVAC technicians and mechanical contractors are the typical installers.

This variable speed pulley is used in residential and light commercial belt-drive blower and fan assemblies. The spring-loaded design allows continuous speed variation within the rated pitch range without manual belt adjustment, making it practical for air handler and ventilation equipment applications. It is intended for installations where a B-series V-belt is already specified and the shaft diameter is 5/8 inch.

Key Features

• Spring-loaded design enables automatic variable speed adjustment within the operating range
• Minimum pitch diameter of 1.72 inches, maximum operating diameter of 4.65 inches
• 5-inch outside diameter with 5/8-inch bore
• Keyway included — 3/16 by 3/32 inch — for positive shaft retention
• Rated 0.5 HP at 1750 RPM and 0.333 HP at 1150 RPM
• Compatible with B-series V-belts per standard trade sizing
• Econoline series construction

Compatibility

Designed for use with B-series V-belts on 5/8-inch shafts in belt-drive blower and fan assemblies requiring variable speed operation.

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 any pulley. Verify shaft diameter and keyway dimensions match before mounting. Check belt alignment and tension after installation per standard drive system practices.