Source1 2812403700 1 Groove Variable Sheave 1.375 Inches Bore Replacement 1VP75

Product Description

The Source1 2812403700 is a 1 groove variable sheave designed for use in HVAC belt drive systems where adjustable speed control is required. With a 1.375 inches bore, this sheave fits a wide range of motor and blower shafts commonly found in rooftop units, air handlers, and commercial HVAC equipment. It serves as a direct replacement for the 1VP75 sheave, making it a reliable choice for HVAC technicians and mechanical contractors sourcing service parts for existing systems. Variable pitch sheaves are a critical component in belt drive assemblies. Unlike fixed sheaves, a variable pitch sheave allows technicians to adjust the effective pitch diameter by changing the position of the movable flange. This changes the drive ratio between the motor sheave and the blower sheave, allowing airflow to be tuned without replacing belts or pulleys entirely. This is a common field adjustment used to balance air systems, meet design CFM targets, or compensate for static pressure changes in ductwork. The 1 groove design accommodates a single V-belt, which is standard for smaller fan and blower motor drives in light commercial and residential HVAC applications. The 1.375 inches bore is a standard shaft size used across many motor manufacturers, reducing the need for adapter bushings in most installations. Proper sheave selection and alignment are essential for belt life, motor efficiency, and quiet operation. HVAC technicians should verify belt type compatibility, torque set screws to specification, and check alignment with a straightedge or laser tool after installation. This sheave is built for professional use and is suited for preventive maintenance programs, equipment retrofits, and emergency service calls where a proven replacement component is needed.

• 1 groove variable pitch sheave with 1.375 inches bore for adjustable belt drive speed control
• Direct replacement for 1VP75 sheave used in HVAC blower and fan motor assemblies
• Allows field adjustment of drive ratio to balance airflow without changing belts or pulleys

Product Highlights

The Source1 2812403700 variable sheave delivers reliable, field-adjustable belt drive performance for HVAC blower systems. Its 1.375 inches bore and single groove design make it a straightforward replacement for the 1VP75 in a wide range of light commercial and residential air handling equipment.

Product Information

Standard Information

• Brand: SOURCE1
• Manufacturer Part Number: 2812403700

Technical Specifications

• Number of Grooves: 1
• Sheave Type: Variable Pitch
• Bore Size: 1.375 inches
• Replacement Part Number: 1VP75