Browning 1045970 Variable Pitched Sheave 2 Groove 5.35 in Od

Product Description

The BROWNING 1045970 is a 2-groove variable pitched sheave designed for adjustable-speed belt drive systems in HVAC, industrial, and commercial equipment applications. With a 7/8-inch bore and a 5.35-inch outside diameter, this sheave accommodates belt sections 3L, 4L, A, 5L, and B, making it a versatile choice for field-adjustable drive configurations. Sheave thickness measures 3 inches, and the face width ranges from 1-3/8 to 2 inches. It weighs 7.4 pounds. HVAC and mechanical service technicians use this sheave to fine-tune blower and fan speeds without changing the drive assembly entirely.

This variable pitch sheave is commonly installed on belt-driven supply and return air blowers, exhaust fans, and other rotating equipment where airflow or speed adjustment is required during commissioning or seasonal balancing. The adjustable pitch design allows the technician to change the effective pitch diameter within a set range, altering the drive ratio without replacing the belt or the driven sheave. It is suited for both new installations and replacement service work in residential and light commercial settings.

Key Features

• 2-groove configuration supports dual belt drive setups for increased torque capacity
• Variable pitch design allows field adjustment of drive speed ratio without drive replacement
• Accepts belt sections 3L, 4L, A, 5L, and B for broad belt compatibility
• 7/8-inch bore fits standard shaft sizes common in blower and fan assemblies
• 5.35-inch outside diameter with 3-inch sheave thickness for stable belt tracking
• Face width adjustable from 1-3/8 to 2 inches to accommodate pitch diameter changes

Compatibility

Designed as an OEM-style replacement or new-installation variable pitched sheave for belt-driven blower and fan assemblies using 3L, 4L, A, 5L, or B section belts with a 7/8-inch bore shaft.

Installation Notes

Installation should be performed by a qualified HVAC technician or mechanical service professional. Disconnect and lock out all power to the equipment before removing or installing any drive components. Ensure the sheave is properly seated and set screws are tightened securely to the shaft before restarting the drive. Verify belt tension and alignment after any pitch adjustment to prevent premature belt wear or sheave damage.