Tb Wood's 2VP75138 Variable Pitch Sheave 2 Groove

Product Description

The TB WOOD'S 2VP75138 is a two-groove, variable pitch Type 2 sheave designed for use in belt-driven HVAC and industrial power transmission systems. It features a 1-3/8 inch inside bore diameter and a 7-1/2 inch outside diameter, with a sheave thickness of 3-1/4 inches and a face width ranging from 1-5/8 to 2-3/8 inches. Compatible belt sections include 4L, 5L, A, and B, as well as 5V profiles. The adjustable pitch design allows technicians to fine-tune drive ratios without changing sheaves. This part weighs 16.5 pounds and is typically installed by HVAC mechanics or millwrights in blower and fan drive assemblies.

The 2VP75138 is suited for residential and light commercial air handling units, rooftop units, and industrial fan applications where belt-drive systems require adjustable speed or torque ratios. Variable pitch sheaves are commonly selected during system commissioning or airflow balancing to match blower RPM to design specifications. The two-groove configuration supports dual-belt drive arrangements that carry higher loads and reduce belt slip on larger fan assemblies.

Key Features

• Variable pitch design allows field adjustment of drive ratio without sheave replacement
• Two-groove configuration for dual-belt drive setups on higher-load applications
• Accepts belt sections 4L, 5L, A, B, and 5V for broad belt compatibility
• 1-3/8 inch bore with 7-1/2 inch outside diameter fits common fan shaft and housing configurations
• Face width adjustable from 1-5/8 to 2-3/8 inches to accommodate pitch changes
• Side groove thickness of 1-13/64 inches provides consistent belt seating geometry

Compatibility

Compatible with belt sections 4L and A (pitch diameter range 5.80 to 6.98 inches) and belt sections 5L and B (pitch diameter range 6.24 to 7.45 inches, minimum open turns of 6 for 5L or B belts). Designed as an OEM-style replacement variable pitch sheave for belt-drive blower and fan systems.

Installation Notes

Installation is typically performed by a licensed HVAC technician or qualified millwright. Disconnect and lock out electrical power to the motor and air handler before removing or installing any sheave. Ensure the sheave bore is fully seated on the shaft and the set screw or bushing is secured before applying belt tension. Verify belt alignment across both grooves after installation to prevent premature belt and bearing wear.