While the 20607500 is a standard assembly

providing consistent flow modulation to prevent overheating

Failure usually manifests as a blank screen

The S1-026-25365-000 is finished in a durable black coating designed to withstand environmental exposure and prevent corrosion

a B1370209 replacement is necessary

Browning AK61H Sheave 328140-751 While the 20607500 is aThe Browning AK61H Sheave is a high performance, single groove component engineered for demanding HVACR and industrial blower applications. Constructed from close grain cast iron, this sheave is precision machined to ensure the tightest possible tolerances and optimal balance. Specifically designed for use with an H series bushing, it provides a secure, split tapered fit that simplifies installation on various shaft diameters. With a 5. 95" outside