Lovejoy 68514427832 Variable Speed Pulley 1 Hp B Belt

Product Description

The LOVEJOY 68514427832 is a spring loaded variable speed pulley designed for use in belt-driven mechanical drive systems. It automatically adjusts pitch diameter to vary output speed, making it a practical choice for fan, blower, and pump applications where speed control is required without manual sheave changes. The pulley is rated at 1 HP at 1750 RPM and 3/4 HP at 1150 RPM. It measures 4.13 inches in length with a maximum outside diameter of 5.65 inches and a 6 inch outside diameter overall. The 5/8 inch bore is machined with a 3/16 x 3/32 inch keyway for positive shaft engagement. This is part of the Econoline series from LOVEJOY and is sold individually.

This variable speed pulley is suited for residential and light commercial HVAC and mechanical systems where belt-driven blower or fan assemblies require adjustable speed operation. It is designed to accept B-series V-belts and is typically installed by HVAC technicians or millwrights performing drive system setup, maintenance, or replacement. The spring loaded design allows for continuous speed adjustment within the operating range without requiring manual repositioning of fixed sheaves.

Key Features

• Spring loaded design enables automatic pitch adjustment for variable speed output
• Rated 1 HP at 1750 RPM and 3/4 HP at 1150 RPM
• Minimum pitch diameter of 2.69 inches with 5.65 inches maximum diameter
• 5/8 inch bore with 3/16 x 3/32 inch keyway for secure shaft mounting
• Compatible with B-series V-belts (belt trade size B)
• Part of the Econoline series — a standard replacement-grade product line

Compatibility

Designed for use with B-series V-belts in belt-driven variable speed drive assemblies. Suitable for HVAC fan and blower applications requiring adjustable speed operation within the rated horsepower range.

Installation Notes

Installation is typically performed by a licensed HVAC technician or qualified millwright. Disconnect and lock out all power to the drive system before removing or installing any pulley or sheave component. Ensure the bore and keyway dimensions match the drive shaft before mounting, and verify belt trade size compatibility before tensioning. Do not exceed the rated horsepower of the pulley for the operating RPM of the application.