Komatsu Thermostat 600-421-6120

The Komatsu Thermostat 600-421-6120 is identified in the supplied parts catalog as a COOLING SYSTEM for specific Komatsu diesel engine and equipment configurations. Cataloged engine models include 4D95L-1AA/1AA-7/1BB/1CC, 4D95L-1FF/GG/W/BW, 4D95L-E-2A, and 4D95S-W-1G-E. Listed machine applications include PC60-6, PC60L-6, PC70-6, PC90-1, and PC60-7. Use the complete model and serial-number details below to compare this part with the equipment being serviced.

What is 600-421-6120 used for?

Part number 600-421-6120 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

4D95L-1AA/1AA-7/1BB/1CC, 4D95L-1FF/GG/W/BW, 4D95L-E-2A, 4D95S-W-1G-E, 4D95S-1H/1J, 4D95LE-3-65

Engine models with serial-number ranges

4D95L-1AA/1AA-7/1BB/1CC (Build 1C) ? 49965-Up | 4D95L-1FF/GG/W/BW (Build 1D) ? 131803-Up | 4D95L-E-2A (Build 1E) ? 100005-Up | 4D95S-W-1G-E (Build 1F) ? 23318-Up | 4D95S-1H/1J (Build 1G) ? 124813-Up | 4D95LE-3-65 (Build 1G-1) ? Not Provided

Application models without serial numbers

PC60-6, PC60L-6, PC70-6, PC90-1, PC60-7, PC60-7B, PC75UU-2, PC60-7 / PC60-7B, PC75UU-3, PC78US-5, PC78US-6-N, D20P-6 / D20P-6A, D20PL-6 / PLL-6, D20Q-6 / S-6, D21A-6 / E-6, D21P-6 / D21P-6A / D21P-6B, D21PL-6, D21S-6 / S-6A, D20P-7A / D20PG-7A, D20PL-7, D21A-7 / D21AG-7 / D21PG-7A, D21QG-7 / S-7, WA65-5 W/CAB, WA70-5, WA80-5 (20Kkm/h), WA80-5 (30Kkm/h), WA80-5

Applications with serial-number ranges

PC60-6 S/No. 28001-Up, PC60L-6 S/No. 8001-Up, PC70-6 S/No. 34101-Up, PC90-1 S/No. 1001-Up, PC60-7 S/No. 45001-Up, PC60-7B S/No. 45001-Up, PC75UU-2 S/No. 5001-Up, PC60-7 / PC60-7B S/No. 45001-Up, PC75UU-3 S/No. 15001-Up, PC78US-5 S/No. 1001-Up, PC78US-6-N S/No. 4001-Up, D20P-6 / D20P-6A S/No. 60001-Up, D20PL-6 / PLL-6 S/No. 60001-Up, D20Q-6 / S-6 S/No. 60001-Up, D21A-6 / E-6 S/No. 60001-Up, D21P-6 / D21P-6A / D21P-6B S/No. 60001-Up, D21PL-6 S/No. 60001-Up, D21S-6 / S-6A S/No. 60001-Up, D20P-7A / D20PG-7A S/No. 75001-78603, D20PL-7 S/No. 62001-62453, D21A-7 / D21AG-7 / D21PG-7A S/No. 75001-78603, D21QG-7 / S-7 S/No. 61001-61131, WA65-5 W/CAB S/No. H50051-Up, WA70-5 S/No. H50051-Up, WA80-5 (20Kkm/h) S/No. H50051-Up, WA80-5 (30Kkm/h) S/No. H50051-Up, WA80-5 S/No. H50051-Up

How do I confirm fitment?

Match 600-421-6120 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 600-421-6120 fit every listed Komatsu machine?
No. Fitment is limited to the cataloged engine, application, and serial-number combinations. Confirm all identifying information before ordering.