York S1-028-04761-700 Sheave

The York S1-028-04761-700 Variable Groove Sheave is a heavy-duty mechanical component engineered for precise airflow modulation in commercial air handling systems. Featuring a 1-1/8" bore size, this adjustable pitch pulley allows technicians to fine-tune the blower fan speed to meet specific CFM requirements without replacing existing drive components. Designed for compatibility with various v-belt profiles, the sheave’s adjustable flange design manages the pitch diameter effectively, ensuring optimal power transmission from the motor to the fan assembly. The cast iron construction provides the structural integrity needed to withstand high-torque startups and minimizes vibration during continuous operation. This OEM-spec part is essential for balancing HVAC ventilation systems where static pressure adjustments are required. Its set-screw locking mechanism ensures a secure fit on the motor shaft, preventing slippage and maintaining reliable performance in high-demand rooftop and indoor mechanical environments. This sheave is a standard solution for York blower motor assemblies requiring variable fan speed control.

• Incremental Airflow Adjustment: Allows for precise system balancing by modifying the effective pitch diameter of the drive.
• Durable Cast Iron Construction: Provides superior heat dissipation and resists mechanical deformation under heavy loads.
• Universal Belt Integration: Engineered to function reliably with standard A and B section belts for versatile application.
• Vibration Reduction: Precision-machined surfaces ensure smooth rotation, extending the service life of motor bearings.

How is the pitch diameter adjusted on this York sheave?
Adjustment is performed by loosening the set screws on the movable flange and rotating it to the desired position, which changes the width of the groove and the resulting fan RPM.

What belt sizes are compatible with this variable groove pulley?
This component is typically designed to accommodate standard v-belt cross-sections, allowing for seamless integration into most belt-driven fan systems with a 1-1/8" shaft.

Can this part be used for shaft sizes other than 1-1/8"?
No, this specific model is bored specifically for a 1-1/8" motor shaft to ensure a precise, vibration-free fit.

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.