Lennox 73M85 Motor Mount Kit

The Lennox 73M85 Motor Mount Kit is a critical OEM replacement component designed to provide a secure, high-stability platform for direct drive blower motors in Lennox and Allied Air residential furnaces. This kit, which is mathematically and physically identical to part number 73M8501, is engineered specifically for 48-frame motors featuring a 5-5/8 inch diameter. As a veteran-grade HVAC motor mounting bracket, it utilizes a torsion flex design to isolate vibration and mechanical resonance, ensuring whisper-quiet operation and protecting the motor’s internal bearings from premature wear caused by misalignment.

For field technicians, this 73M85 blower motor bracket offers a precise fit with a 2.5-inch ring diameter and 7.06-inch on-center arm spacing. The kit includes three mounting arms, a hub ring, and high-durometer rubber isolation grommets to maintain furnace motor stability under high-torque startup conditions. It is frequently utilized in Lennox G40, G51, and G61 series units, as well as EL195 models. This Lennox 73M85 replacement ensures that the blower wheel remains perfectly centered within the housing, optimizing airflow efficiency and preventing cabinet rattling in high-static pressure applications.

Key Benefits

• Universal 48-Frame Compatibility: Designed for standard 5.5-inch to 5-5/8 inch diameter motors commonly found in Lennox furnace blowers.
• Enhanced Vibration Isolation: Integrated rubber grommets and torsion-flex arms reduce mechanical noise and operational stress.
• OEM Precision Alignment: Specific 7.06" O.C. spacing eliminates the guesswork during motor swaps, ensuring the shaft is perfectly perpendicular to the blower wheel hub.
• Industrial-Grade Build: Heavy-duty steel construction with anti-corrosion coating for longevity in high-moisture condensing furnace environments.
• Direct Replacement Logic: Fully interchangeable with Lennox 73M8501, LB-108026A, and 100441-01 part numbers.

Common Questions

Will this mount fit my 5-inch diameter motor?
No, the 73M85 is specifically engineered for 48-frame motors (5-5/8 inch diameter). For 5-inch (42-frame) motors, a different bracket assembly is required to ensure proper ring tension.

Does this kit include the mounting hardware for the blower housing?
The kit includes the hub ring, mounting arms, and isolation grommets. It is standard practice to reuse the existing housing bolts, though the arms are compatible with standard self-tapping HVAC sheet metal screws.

How do I ensure the blower wheel stays balanced after installation?
Always mark the original motor's depth on the shaft before removal. When installing the 73M85, ensure the grommets are seated fully in the arms to prevent the motor from "walking" or tilting during high-speed operation.

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.