Lovejoy 68514427807 Variable Speed Pulley Econoline

Product Description

The LOVEJOY 68514427807 is a spring loaded variable speed pulley from the Econoline series, designed for use in belt-driven mechanical power transmission systems. It automatically adjusts pitch diameter to vary output speed without manual intervention, making it well suited for fan, blower, and light-duty drive applications. The pulley measures 2.81 inches in length with a maximum pitch diameter of 3.13 inches, a 3.38-inch outside diameter, and a 5/8-inch bore. It is rated at 0.333 horsepower at 1750 RPM and 1/4 horsepower at 1150 RPM. Installation requires a 3/16 x 3/32 inch keyway. HVAC technicians and mechanical contractors are the primary installers of this component.

This variable speed pulley is used in residential and light commercial HVAC applications where belt-driven blower assemblies require adjustable speed control. It is compatible with A-series V-belts and is commonly installed on fan shafts in air handling units, furnace blowers, and similar belt-drive equipment. The Econoline series is designed for cost-effective, reliable performance in standard-duty drive applications where variable airflow or speed adjustment is needed without electronic controls.

Key Features

• Spring loaded design allows automatic pitch adjustment for variable speed output
• Minimum pitch diameter of 1.62 inches for wide speed range adjustment
• Rated 0.333 HP at 1750 RPM and 0.25 HP at 1150 RPM
• Includes keyway: 3/16 x 3/32 inch for positive shaft engagement
• 5/8-inch bore fits standard blower and fan shaft sizes
• Compatible with A-series V-belts per trade size designation

Compatibility

Designed for use with A-series V-belts in belt-driven blower and fan assemblies. Verify bore size, keyway dimensions, and horsepower rating against existing drive system requirements before installation.

Installation Notes

Installation is typically performed by licensed HVAC technicians or qualified mechanical contractors. Disconnect and lock out electrical power to the air handling unit or blower assembly before removing or installing the pulley. Ensure the shaft and keyway are clean and free of burrs before seating the pulley. Confirm belt tension and alignment per the belt manufacturer's guidelines after installation to prevent premature wear.