York S1-028-09985-700 Sheave

The York S1-028-09985-700 Sheave is a precision-engineered single groove cast iron pulley designed for heavy-duty HVAC blower and motor assemblies. Featuring a 6.45-inch outside diameter and a 1-inch fixed bore, this component ensures stable torque transmission and maintains proper belt alignment in high-static pressure environments. The ASTM A48 class 30 cast iron construction provides superior vibration dampening and heat dissipation compared to stamped steel alternatives, critical for extending the service life of both the drive belt and motor bearings. This OEM York replacement part is machined to exact tolerances to prevent runout and ensure concentricity, making it an essential component for technicians performing drivetrain maintenance or air balancing on York, Luxaire, and Coleman commercial air handlers.

Key Technical Benefits:

• Optimal Power Transfer: The 1-inch bore with keyway prevents slippage under high-torque startup conditions.
• Durable Cast Iron Housing: Resists grooving and wear from V-belt friction, maintaining consistent RPM ratios.
• Dynamic Balance: Reduced vibration levels minimize harmonic noise and mechanical fatigue in the drive assembly.
• Direct OEM Fitment: Eliminates the compatibility issues often found with universal HVAC motor sheaves.

Common Installation Questions:

What belt profile is compatible with this sheave?
This 6.45" OD sheave is designed for standard A-section or 4L profile V-belts commonly used in commercial ventilation systems.

How do I ensure the set screw provides maximum retention?
Technicians should ensure the fixed bore sheave is seated fully on the motor shaft keyway and tightened to the manufacturer's specified torque to prevent shaft marring.

Can this sheave be used in variable speed applications?
While this is a fixed diameter pulley, it is frequently used on the driven side of a blower assembly in conjunction with a variable frequency drive (VFD) for precise airflow control.

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.