Tb Wood's 2VP65138 Variable Pitch Sheave 2 Groove

Product Description

The TB WOOD'S 2VP65138 is a Type 2 variable pitch V-belt sheave designed for adjustable-speed drive applications in HVAC and industrial fan and blower systems. It features a 1.375-inch inside bore diameter and a 6.5-inch outside diameter, with two grooves machined to accept 4L, 5L, A, and B cross-section belts. The sheave is cast from iron for durability and dimensional stability under continuous cyclic load. Face width ranges from 1.625 to 2.375 inches depending on pitch adjustment, and sheave thickness is 3.25 inches. Licensed HVAC technicians and mechanical drive specialists install this component when field-adjustable motor-to-blower speed ratios are required.

This sheave fits residential and light commercial air handling units, rooftop units, and belt-driven blower assemblies where variable airflow tuning is needed without replacing the drive assembly. It is suited for installations where the system speed must be set or fine-tuned during commissioning or after blower motor replacement. The 2VP65138 accommodates multiple belt trade sizes, making it a practical stock item for service techs handling a range of equipment.

Key Features

• Variable pitch design allows field adjustment of drive ratio without changing sheaves or belts
• Two-groove configuration accepts 4L, 5L, A, and B cross-section V-belts
• 1.375-inch bore diameter with 6.5-inch outside diameter for mid-range blower drive sizing
• Cast iron construction provides rigidity and resistance to belt-induced radial loads
• Pitch diameter range of 4.75 to 5.98 inches for 4L or A belts; 5.24 to 6.45 inches for 5L or B belts
• Minimum open turns of 6 for both 4L or A and 5L or B belt types

Compatibility

Compatible with 4L, 5L, A, and B cross-section V-belts. Designed as an OEM-style variable pitch replacement sheave for belt-driven blower and fan drive assemblies in HVAC and industrial applications.

Installation Notes

Installation should be performed by a qualified HVAC technician or mechanical drive specialist. Disconnect and lock out all power to the unit before removing or installing any drive components. Ensure the sheave is properly aligned with the mating sheave using a straightedge or laser alignment tool before tensioning the belt. Adjust pitch setting to the required position before final tightening, and verify belt tension and tracking after startup.