Browning 1026780 Single Groove Sheave 5.45 in Od 3/4 in Bore

Product Description

The BROWNING 1026780 is a finished bore single groove sheave designed for use with V-belt drive systems in HVAC, industrial, and mechanical power transmission applications. Machined from cast iron, this sheave features a 5.45-inch outer diameter and a 3/4-inch finished bore, making it a direct drop-in for standard belt drive configurations. The pitch diameter measures 5.2 inches for 4L and A-series belts and 4.86 inches for 3L-series belts. Overall length through the bore is 1-5/32 inches. HVAC technicians, millwrights, and mechanical contractors install this type of component when replacing worn or damaged sheaves on fan and blower assemblies.

This sheave is suited for single-groove V-belt drive setups in residential and light commercial HVAC equipment, including belt-driven blowers, fans, and air handlers. The finished bore allows installation without additional machining. Its cast iron construction provides durability in continuous-duty motor and drive applications. The 3/4-inch bore fits common fractional and integral horsepower motor shafts used in HVAC and ventilation equipment.

Key Features

• 5.45-inch outer diameter with 3/4-inch finished bore — no additional machining required
• Pitch diameter of 5.2 inches for 4L and A-series V-belts
• Pitch diameter of 4.86 inches for 3L-series V-belts
• Single groove design for standard single V-belt drive configurations
• Cast iron construction for long service life in continuous-duty applications
• Overall bore length of 1-5/32 inches for positive shaft engagement

Compatibility

Designed as an OEM-style replacement single groove sheave for V-belt drive systems using 3L, 4L, or A-series belts with a 3/4-inch shaft bore.

Installation Notes

Installation should be performed by a qualified HVAC technician or mechanical contractor. Disconnect and lock out all electrical power to the motor and drive system before removing or installing any sheave. Verify shaft diameter and keyway dimensions before installation, and confirm belt type and drive ratio requirements before selecting belt and sheave combinations. Tighten any set screws to the fastener manufacturer's specification and inspect belt tension and alignment after installation.