Carrier KT63ZZ118 Bearing

The Carrier KT63ZZ118 Bearing is a critical Factory Authorized Part (FAP) engineered for high-performance HVAC applications, specifically within Carrier, Bryant, and Payne 48-series rooftop units (RTU). This ball bearing pillow block features a precision-ground 1-7/16" bore diameter and a standard-duty 200 series design, providing a drop-in replacement for worn blower or fan shaft components. Constructed with a cast iron housing (or malleable iron), it ensures structural rigidity during high-torque startup and continuous operation. The assembly includes a pre-lubricated bearing and a locking device to secure the shaft to the inner race, maintaining alignment and reducing vibration across the drive assembly.

For technicians performing a retrofit or repair, the KT63ZZ118 offers a 5-inch (or 5.5-inch depending on housing revision) mounting center distance and a 2-inch base-to-shaft center height. This OEM replacement bearing replaces legacy part numbers including KT63CZ112, KT63CU100, and P461-2903. Using a genuine Carrier KT63ZZ118 preserves the integrity of the original equipment's agency listings and safety standards while preventing the premature shaft wear often associated with non-proprietary aftermarket alternatives.

Key Benefits

• Precision Fit: Features a 1-7/16-inch bore specifically machined for HVAC blower shafts, ensuring a secure, concentric fit.
• Durable Construction: The cast iron pillow block housing provides superior heat dissipation and resists deformation under belt-drive tension.
• Ready for Service: Pre-lubricated with high-grade synthetic grease to minimize friction and extend life cycles in demanding air-handling environments.
• Broad Compatibility: Direct replacement for Carrier KT63CZ110 and 48DA680126, simplifying inventory for commercial service contractors.

Common Questions

What Rooftop Units (RTU) are compatible with this bearing?
This bearing is commonly utilized in Carrier 48DA, 48TJ, and 50HJ models. Always verify the shaft diameter is 1-7/16" as some larger chassis may utilize a 1-11/16" or 2-3/16" configuration.

Is the locking collar included with the assembly?
Yes, the KT63ZZ118 comes with the integrated locking device (eccentric collar or set screw depending on the FAP revision) required to secure the inner race to the blowers shaft.

Does this bearing require initial greasing upon installation?
While these units are pre-lubricated from the factory, technicians should inspect the grease fitting (Zerk) and confirm lubrication levels per the specific equipment's maintenance schedule for optimum startup performance.

This item is not eligible for free shipping.

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.