This blower resistor is a direct replacement part designed to fit tractors, including models M4900, M5040, and M6040. Part numbers 1906-7006 and 3A851-72180 ensure compatibility with your equipment's HVAC system. The resistor plays a crucial role in controlling the speed of your tractor's blower motor, allowing you to adjust airflow and maintain comfortable cabin temperatures during operation. Manufactured to meet OEM specifications, this component features a durable construction with a multi-pin connector for secure installation. The resistor's compact design allows it to mount easily in the existing location, making replacement straightforward for both professional mechanics and DIY enthusiasts. When your tractor's blower only works on high speed or stops functioning altogether, a faulty resistor is often the culprit. This replacement part restores full functionality to your climate control system, ensuring you can work comfortably in all weather conditions. Please verify your tractor model and part number before ordering to ensure proper fitment.