York S1-028-12403-700 Sheave

The York S1-028-12403-700 Sheave is a professional-grade, 1-groove variable pitch pulley designed for precise HVAC blower speed adjustment in commercial air handling units. Engineered with a 1 3/8" bore and a 7.50" outer diameter, this OEM component allows technicians to fine-tune fan RPM and airflow volume to meet specific static pressure requirements. The variable pitch design is compatible with 4L, 5L, A, and B section V-belts, providing a versatile solution for balancing belt-driven drive systems. Constructed from high-durability cast iron, this adjustable V-belt pulley features a standard ANSI keyway and secure 5/16-18 knurled setscrews to maintain alignment during high-torque operation. Whether you are performing a York HVAC part replacement or optimizing a system for VAV (Variable Air Volume) performance, this sheave ensures stable power transmission and reduced vibration across a range of speed ratios.

• Precise Airflow Tuning: Single-groove variable pitch allows for minute adjustments to the pitch diameter, enabling exact fan speed calibration.
• Broad Belt Compatibility: Designed to accommodate 4L, A, 5L, and B section V-belts for various drive configurations.
• Industrial-Grade Build: Rugged cast iron construction minimizes thermal expansion and wear in demanding mechanical room environments.
• Secure Shaft Mounting: Features a robust 1 3/8" bore with integrated setscrews for reliable torque transfer to the motor shaft.

• How do I adjust the pitch diameter? To change the pitch, loosen the locking setscrews on the movable flange and rotate the flange clockwise to increase speed or counter-clockwise to decrease it. Always ensure setscrews are tightened back onto the flat of the hub.
• Which belts work best with this sheave? This model is optimized for A and B classical V-belts, as well as 4L and 5L light-duty belts.
• Does this include the keyway? Yes, the 1 3/8" bore comes with a standard ANSI keyway for secure interlocking with the motor shaft key.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.