OEM-specification Komatsu Cooling Component. Part number 1W4879. Compatible with 16h Na, 245, 3406, 3406b, 3406c, 578, 583r, 587r, 621, 621b, 621e, 621F, 623e, 623F, 627b, 627e, 627F, 814b, 824c, 824g, 825g, 826c, 826g, 980c, 980g, D350e, D400e, D8N, D8r, D8r II, hT400, PM-465.
Always verify with serial number before ordering.
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Flush cooling system with distilled water before refilling. Use pre-mixed coolant — never plain water, which causes corrosion. Pressure-test system after any cooling repair. Check thermostat by immersing in hot water — should open at rated temperature.
Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.