Komatsu 600-421-6210 Thermostat Assembly

Technical engineering specifications for Komatsu thermostat part number 600-421-6210. This wax-pellet type thermostat regulates engine coolant temperature at 76.5 degrees Celsius (170 degrees Fahrenheit) opening point. Designed for Komatsu 4D105 and 6D105 series diesel engines used in PC200-3 and PC220-3 hydraulic excavators. Constructed with stainless steel valve, brass body, and copper wax element for corrosion resistance and precise thermal response. Direct OEM replacement meeting original equipment dimensions and flow characteristics. Material composition includes stainless steel flange, brass housing, and calibrated wax pellet assembly. Component construction follows JIS B 8010 thermostat testing standards for heavy equipment duty cycles. OEM cross-reference interchange includes Komatsu 6004216210 superseding earlier 600-421-6310 variant.