Lovejoy 68514427808 Variable Speed Pulley 0.333 Hp

Product Description

The LOVEJOY 68514427808 is a spring loaded variable speed pulley designed for use in variable-speed belt drive systems. It automatically adjusts the effective pitch diameter as load and speed conditions change, allowing a single pulley to deliver a range of drive ratios without manual intervention. Rated at 0.333 HP at 1750 RPM and 1/4 HP at 1150 RPM, this pulley suits light-duty power transmission applications. The unit measures 2.81 inches in length with a maximum pitch diameter of 3.13 inches and an outside diameter of 3.38 inches. The 3/4 inch bore accepts standard motor shafts common in fractional-horsepower drive systems.

This variable speed pulley is intended for fractional-horsepower motor and fan drive applications found in HVAC air handlers, blowers, and light industrial equipment. The spring loaded design automatically compensates for belt stretch and load variation, maintaining consistent belt tension throughout the operating range. A minimum pitch diameter of 1.62 inches allows a meaningful speed range for properly matched belt and sheave combinations. Installation is typically performed by HVAC technicians or millwrights during belt drive assembly or motor replacement service.

Key Features

• Spring loaded variable pitch design adjusts drive ratio automatically under load
• Maximum pitch diameter of 3.13 inches with 1.62 inches minimum pitch for a usable speed range
• 3/4 inch bore fits standard fractional-horsepower motor shafts
• Rated 0.333 HP at 1750 RPM and 0.25 HP at 1150 RPM
• Outside diameter of 3.38 inches suits compact drive housings
• Single-piece package quantity for direct replacement or new installation

Compatibility

Designed as an OEM-style replacement or new-installation variable speed pulley for fractional-horsepower belt drive systems requiring a 3/4 inch bore and a maximum pitch diameter of 3.13 inches.

Installation Notes

Installation is performed by a qualified HVAC technician or mechanical tradesperson. Shut off and lock out all power to the motor and drive assembly before removing or installing any belt drive components. Verify belt type and cross-section are matched to the pulley groove profile before final assembly. Do not overtighten set screws beyond the fastener manufacturer specification for the shaft diameter in use.