Komatsu Engine Thermostat 600-421-6630

Komatsu Engine Thermostat 600-421-6630 is a Komatsu engine replacement part listed by 19PARTS for engine-section lookup, hub navigation, and part-number verification.

Product overview

Part number 600-421-6630 is listed as Thermostat. Search also by the no-dash alternate number 6004216630.

Product code / ETP anchor: 600-421-6630W. This listing is tied back to the sourcing anchor used for catalog control.

Engine book references

This part appears in Komatsu engine parts book paths such as:

• ENGINES / S6D125E-2A-6 S/N 60721-UP / ENGINE / THERMOSTAT HOUSING(#61582-) (A1730-A3F3)
• ENGINES / S6D125E-2B-6 S/N 60721-UP / ENGINE / THERMOSTAT HOUSING(#61582-) (A1730-A3F3)
• ENGINES / S6D125E-2C-6 S/N 60721-UP / ENGINE / THERMOSTAT HOUSING(#60863-) (A1730-A3E7)
• ENGINES / S6D125E-2D-6 S/N 60721-UP / ENGINE / THERMOSTAT HOUSING (WITH THERMO SENSOR)(#61434-) (A1730-A3F4)
• ENGINES / S6D125E-2D-6 S/N 60721-UP / ENGINE / THERMOSTAT HOUSING(#60863-) (A1730-A3E7)
• ENGINES / S6D125E-2E S/N 60863-UP / ENGINE / THERMOSTAT HOUSING (A1730-A3E7)

This part appears in 410 Komatsu engine book paths in our reference data.

Verification note

Always confirm final fitment by engine model, serial range, diagram callout, and part number before ordering. Hub references are provided to help buyers find the right engine section and related parts faster.

Keep Ops Moving

19PARTS organizes Komatsu engine parts around searchable engine-model hubs so rebuild shops, equipment owners, and fleet teams can identify parts and keep repairs moving.