Komatsu Thermostat 600-421-6220

The Komatsu Thermostat 600-421-6220 is identified in the supplied parts catalog as a COOLING SYSTEM for specific Komatsu diesel engine and equipment configurations. Cataloged engine models include S6D105-1. Listed machine applications include WA250-1, WA300-1, WA320-1, GD515A-1, and GD525A-1. Use the complete model and serial-number details below to compare this part with the equipment being serviced.

What is 600-421-6220 used for?

Part number 600-421-6220 is cataloged as a Thermostat. It appears in the COOLING SYSTEM parts group. The correct selection depends on the engine model, machine model, and the applicable serial-number range.

Compatible engine models

S6D105-1

Engine models with serial-number ranges

S6D105-1 (Build 6F) ? 63244-Up

Application models without serial numbers

WA250-1, WA300-1, WA320-1, GD515A-1, GD525A-1, GD525A-1D, GD525A-1C, GD611A-1, GD621A-1 / R-1, GD655A-5, GD661A-1

Applications with serial-number ranges

WA250-1 S/No. 10001-Up & A10509-Up, WA300-1 S/No. 10001-Up, WA320-1 S/No. 10001-Up, GD515A-1 S/No. 50001-Up, GD525A-1 S/No. 50001-Up, GD525A-1D S/No. 55001-Up, GD525A-1C S/No. 60001-Up, GD611A-1 S/No. 10001-Up, GD621A-1 / R-1 S/No. 10001-Up, GD655A-5 S/No. 65001-Up, GD661A-1 S/No. 10001-Up

How do I confirm fitment?

Match 600-421-6220 to the existing part number and verify the complete engine model, equipment model, and serial number. A shared model name does not confirm compatibility because production changes can affect the required component.

Frequently asked question

Will 600-421-6220 fit every listed Komatsu machine?
No. Fitment is limited to the cataloged engine, application, and serial-number combinations. Confirm all identifying information before ordering.