Lovejoy 68514427887 Variable Speed Pulley 5hp B Belt

Product Description

The LOVEJOY 68514427887 is a spring loaded variable speed pulley designed for use with B-series V-belts in adjustable-speed drive applications. The Econoline series pulley uses an internal spring mechanism to maintain belt tension automatically as sheave pitch diameter varies, allowing motor speed to be changed without manual belt adjustment. It measures 8.25 inches outside diameter with a 1.125 inch bore and includes a 1/4 x 1/8 inch keyway for positive shaft engagement. Rated at 5 Hp at 1750 RPM and 3 Hp at 1150 RPM, this pulley suits a range of light industrial and HVAC fan drive applications. The unit weighs 9.75 pounds and ships as a single piece.

This variable speed pulley is used in belt-driven systems where output speed needs to be varied across a range without changing belt length or swapping sheaves. Typical installations include commercial ventilation fans, blower assemblies, and light industrial machinery where a B-series belt is already specified. The spring loaded design keeps the belt seated properly across the operating pitch range, reducing slippage and uneven wear. Installation is performed by licensed mechanical contractors or qualified millwrights working on rotating drive equipment.

Key Features

• Spring loaded design automatically maintains belt tension across variable pitch settings
• Compatible with B-series V-belts per standard belt trade sizing
• Includes keyway (1/4 x 1/8 inch) for positive shaft locking
• 5 Hp rating at 1750 RPM and 3 Hp rating at 1150 RPM
• Minimum pitch diameter of 5 inches, maximum outside diameter of 8.25 inches
• Econoline series construction for standard variable speed drive service

Compatibility

Designed for use with B-series V-belts in variable speed drive assemblies. Bore size of 1.125 inches with a 1/4 x 1/8 inch keyway suits standard shaft configurations in that bore range. No specific equipment model compatibility was provided in the product data.

Installation Notes

De-energize and lock out the drive motor before removing or installing any belt-drive components. Verify shaft diameter and keyway dimensions match the pulley bore and keyway specifications before installation. Confirm belt trade size is B-series before fitment. Follow applicable OSHA and equipment manufacturer guidelines for belt drive guarding after reassembly.