John Deere RE61879 Coolant Expansion Tank Assembly

The John Deere RE61879 coolant expansion tank serves as a direct replacement for the RE154389 reservoir. It is designed for the cooling systems of John Deere 6076HRW and 6081HRW series diesel engines installed in 8000 and 8010 series row-crop tractors. The tank manages coolant volume expansion during thermal cycles and provides a service point for system filling and inspection. Critical mounting points, hose connection ports, and pressure cap seat dimensions conform to OEM specifications for proper fitment and sealing performance. Constructed from high-temperature resistant polymer, the assembly withstands repeated pressure and temperature fluctuations inherent in heavy-duty agricultural operation. This component is essential for maintaining cooling system efficiency and preventing coolant loss in John Deere 8100, 8200, 8300, and 8400 tractor platforms.