York S1-028-04807-700 Sheave

The York S1-028-04807-700 is an industrial-grade single groove variable pitch sheave designed for precise airflow and speed modulation in belt-driven HVACR systems. Constructed from heavy-duty cast iron, this 1VM50 sheave features a 4.75" outside diameter and a 7/8" fixed bore, making it a direct OEM replacement for York and Johnson Controls air handlers and furnace applications. The adjustable pitch range of 3.3" to 4.8" allows contractors to fine-tune blower motor speed and static pressure without replacing pulleys, ensuring optimal system balancing and energy efficiency. Engineered for high-torque environments, the vibration-resistant architecture minimizes belt wear and mechanical fatigue. Whether you are replacing a worn drive component or upgrading a variable speed drive system, this cast iron pulley provides the mechanical reliability required for light commercial and residential blowers.

Key Benefits

• Precision Variable Pitch: Offers a 3.3" to 4.8" pitch adjustment to accurately calibrate fan speeds and CFM requirements.
• Durable Cast Iron Construction: High-density material ensures heat dissipation and structural integrity under constant mechanical load.
• Standardized 7/8" Bore: Features a fixed bore with a standard keyway for a secure fit on 7/8-inch motor shafts.
• OEM Compatibility: Specifically engineered as a genuine York replacement part to maintain original equipment performance standards.
• Efficiency Optimization: Reduces belt slippage and system resonance, extending the service life of drive belts and motor bearings.

Common Questions

What is the maximum pitch for this sheave?
The York S1-028-04807-700 provides a flexible pitch range between 3.3" and 4.8", allowing for significant adjustment of the drive ratio.

Can this sheave be used with multi-groove belts?
No, this is a single groove sheave designed for standard V-belt profiles typically used in single-drive blower configurations.

Why choose a variable pitch sheave over a fixed pulley?
Variable pitch designs allow technicians to adjust the fan speed on-site to compensate for ductwork restrictions or changes in static pressure without changing the motor speed or pulleys.

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.