Lovejoy 68514427816 Variable Speed Pulley Econoline

Product Description

The LOVEJOY 68514427816 is a spring loaded variable speed pulley designed for use in belt-driven mechanical power transmission systems. Part of the Econoline series, this pulley automatically adjusts pitch diameter to vary output speed without manual intervention. It accepts A-series V-belts and features a keyway for positive shaft engagement. Rated at 0.5 hp at 1750 RPM and 0.333 hp at 1150 RPM, it suits light-duty variable speed drive applications. With a maximum outside diameter of 4 inches, a minimum pitch of 1.62 inches, and an overall length of 2.81 inches, this pulley fits compact drive configurations. Licensed mechanics and HVAC technicians typically install this component in blower and fan drive assemblies.

This variable speed pulley is suited for residential and light commercial applications where belt-driven blower or fan speed must be adjusted without changing pulleys manually. The spring loaded design maintains belt tension across the speed range, making it practical for HVAC air handling units, exhaust fans, and similar rotating equipment. The 5/8-inch bore with a 3/16 x 3/32-inch keyway accommodates standard fractional horsepower motor shafts commonly found in these systems.

Key Features

• Spring loaded variable pitch design automatically maintains belt tension across speed range
• Accepts A-series V-belts for broad belt availability
• 3/16 x 3/32-inch keyway provides positive, slip-resistant shaft engagement
• Rated 0.5 hp at 1750 RPM and 0.333 hp at 1150 RPM for light-duty drive applications
• Econoline series construction balances performance with cost efficiency in fractional horsepower drives
• 4-inch outside diameter and 2.81-inch length fit compact drive housings

Compatibility

Designed as an OEM-style replacement or upgrade for spring loaded variable speed pulley applications using A-series V-belts with a 5/8-inch bore shaft and fractional horsepower motors in blower or fan drive assemblies.

Installation Notes

Installation should be performed by a qualified technician. Disconnect and lock out all power to the drive system before removing or installing the pulley. Ensure the shaft is clean and free of burrs before sliding the pulley onto the bore, and seat the key fully in the keyway before securing. Verify belt alignment and tension per the equipment manufacturer's specifications after installation, and confirm all guards are reinstalled before returning the system to service.