Komatsu Thermostat 600-421-6630

The Komatsu Thermostat 600-421-6630 is identified in the supplied parts catalog as a COOLING SYSTEM for specific Komatsu diesel engine and equipment configurations. Cataloged engine models include S6D125E-2 & SA6D125E-2, S6D125E-2, SA6D125E-2, and SA6D125E-3B-7 & SAA6D125E-3. Listed machine applications include D53A-17, D53P-17, D58E-1, D58E-1B, and D58P-1. Use the complete model and serial-number details below to compare this part with the equipment being serviced.

What is 600-421-6630 used for?

Part number 600-421-6630 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

S6D125E-2 & SA6D125E-2, S6D125E-2, SA6D125E-2, SA6D125E-3B-7 & SAA6D125E-3, SA6D125E-3B-7/8 & SAA6D125E-3, SAA6D125E-5A/B/C, SAA6D125E-6, S6D140-1, SA6D140E-2 & SAA6D140E-2, SA6D140-1, SA6D140E-3 & SDA6D140E-3, SAA6D140E-5A/B/C, SA12V140-1, SAA12V140-1, SDA12V140-1, SAA12V140ZE-2, SAA12V140E-3, S4D155-4, S6D155-4, SA6D155-4, S6D170-1, S6D170E/SA6D170E/SAA6D170E-2, SA6D170-1, SA6D170-A-1T, SAA6D170E-2A, SA6D170E-3A-7 & SAA6D170E-3F-8, SAA6D170E-5, SA8V170-1, SA12V170-1, SA12V170E-2A, NH220-C1, N855-1, NTA855-1, NT855-1

Engine models with serial-number ranges

S6D125E-2 & SA6D125E-2 (Build 10B) ? 61779-Up | S6D125E-2 (Build 10F) ? Not Provided | S6D125E-2 & SA6D125E-2 (Build 10G) ? Not Provided | SA6D125E-2 (Build 10J) ? Not Provided | SA6D125E-3B-7 & SAA6D125E-3 (Build 10K) ? 310001-Up | SA6D125E-3B-7/8 & SAA6D125E-3 (Build 10L) ? 310001-Up | SAA6D125E-5A/B/C (Build 10M) ? 560004-Up | SAA6D125E-6 (Build 10N) ? Not Provided | S6D140-1 (Build 12A) ? Not Provided | SA6D140E-2 & SAA6D140E-2 (Build 12B) ? Not Provided | SA6D140-1 (Build 12C) ? Not Provided | SA6D140E-3 & SDA6D140E-3 (Build 12D) ? Not Provided | SAA6D140E-5A/B/C (Build 12E) ? 530001-Up | SA12V140-1 (Build 13A) ? Not Provided | SAA12V140-1 (Build 13B) ? Not Provided | SDA12V140-1 (Build 13C) ? Not Provided | SAA12V140ZE-2 (Build 13D) ? Not Provided | SAA12V140E-3 (Build 13E) ? Not Provided | S4D155-4 (Build 14) ? Not Provided | S6D155-4 (Build 14A) ? Not Provided | SA6D155-4 (Build 14B) ? Not Provided | S6D170-1 (Build 15A) ? Not Provided | S6D170E/SA6D170E/SAA6D170E-2 (Build 15B) ? Not Provided | SA6D170-1 (Build 15C) ? Not Provided | SA6D170-1 (Build 15D) ? Not Provided | SA6D170-A-1T (Build 15E) ? 14203-Up | SAA6D170E-2A (Build 15F) ? 17389-Up | SA6D170E-3A-7 & SAA6D170E-3F-8 (Build 15G) ? 310001-Up | SAA6D170E-5 (Build 15H) ? 310001-Up | SA8V170-1 (Build 16A) ? 10001-Up | SA12V170-1 (Build 17A) ? Not Provided | SA12V170E-2A (Build 17B) ? Not Provided | NH220-C1 (Build 18A) ? Not Provided | N855-1 (Build 19A) ? Not Provided | NTA855-1 (Build 19B) ? Not Provided | NT855-1 (Build 19C) ? Not Provided

Application models without serial numbers

D53A-17, D53P-17, D58E-1, D58E-1B, D58P-1, D58P-1B, D65E-12, D65EX-12, D65P-12, D65PX-12, D75S-5, D85A-21, PC450-6-T2 / LC-6-T2, D85A-21B, PC450LC-6K-KE, D85C-21A / C-21D, PW400MH-6, D85E-21, D85P-21, D87P-2, HD255-5, WA450-3 / 3A-TW, WA450L-3, PC400-6 / 6C / 6Z, PC400-6-T2 / LC6-T2, PC400LC-6, PC400LC-7L, PC450-6-A1 / LC-6-A1, PC450-6K-J / LC-6K-J, PC450-6K-KE, D87E-2, PC400LC-6, PC400HD-6, PC400HD-6LK, PC400LC-6LK, WA450-3 Avance Plus, WA470-3H Active, D65EX-12-E, WA470-5H, D65P-12-E, WA480-5L, D65PX-12-E, WA480-5-W, D85EX-15, HM300-1, WA450-5L, WA450-5-W, WA480-5, D85PX-15EO, WA450, WA470, WA480-6, HM300-3, WA470-7, WA500-1, WA500-1L, WA500-3, D135A-2, D155A-3, D155AX-3, GD825A-2, PC1600SP-1, PC1800-6, D155A-5, GD825A-1, D155AX-5, D355C-3-A, HD325-6, D355C-3-DA, HD325-6Z, PC750-6 /LC-6 / SE-6, HD405-6, PC750LC-6K-01, HD405-6, PC750SE-6K / 6K-01, WD500-3, PC800-6 / SE-6, PC650-3, PC650LC-3, PC650SE-3, PC650-5, PC650E-5, PC650LC-5, PC650SE-5, PC710-5 / SE-5, PC1600-1, HD325-5, HD325-6/6W, PC-750-6-AW, PC-750LC-6-AW, PC750LC-6K-01 / SE-6K-01, HM350-1, PC-750SE-6-AW, HM400-1, PC800-6-AW / SE-6-AW 30001-Up, D275AX-5, PC1800-6-T2, PC600-6A-KJ / 6A-W1, PC600-6K, WA500-3H, PC600LC-6A-CA / KJ / W1, WA500-3LK, D27AX-5EO, PC600LC-8, WA500-7, D475A-2, WA800-2, WA800-3, WA900-1, WA900-1L, WA900-3, HD785-3, HD785-5, HD985-3, HD985-5, WA800-2LC, WA800-3LC, WA900-1LC, WA900-3LC, D475A-3RP, HD785-5LC, HD785-7, PC2000, WA900, D95S-1, D150A-1, D155A-1, D155W-1, D155A-2, D155S-1, D355A-3, D355A-5, D275A-2, PC650-1, WA600-1, WA600-1, WA600-1L, D375A-3, D375A-3, D375A-3AD / 3D, PC1000-1, PC1000LC-1, PC1000SE-1, PC1000SP-1, PC1100-6, PC1100LC-6, PC1100SP-6, WA600-3, WA700-1L, WA700-3, WA700-3L, D375A-1, D375A-2, WA700-1, HD465-3, HD465-5, HD605-5, D375A-5, HD465-7, HD605-7, PC1250-7, PC1250LC-7, PC1250SP-7, WD600-3, WA600-3C / 3D, WA600-3LK, WA700-3 / 3D, D375A-6, D375A-6 (Mining Spec.), D375A-6R, D375A-5 (W/O EGR), D375A-5E0 (ecot3), HD465-7E0, HD465-7R, HD465-7R, HD465-7E0 (ecot3), HD465-7R (W/O EGR), HD605-7R (W/O EGR), HD605-7E0, HD605-7E0 (ecot3), HD605-7R, PC1250SP-8, PC1250LC-8, PC1250-8, PC1250-8R, PC1250SP-8R, PC1250-8R (Extreme Hot Area Arrangement), PC1250SP-8R (Extreme Hot Area Arrangement), PC1250-8R, PC1250-8R (EGR-LESS), PC1250-8R (W/O EGR, +55C DEGREE), PC1250SP-8R (W/O EGR), PC1250SP-8 (ecot3, For SP), PC1250-8 (ecot3), WA600-6 (ecot3), WA600-6, WA600-6 (For KAL), WA600-6R (W/O EGR), WA600-6R, WD600-6, WD600-6, D475A-1, WA800-1, HD785-2, D575A-2SD, D575A-2SR, D575A-3, D60A-7, D60E-6, D60E-7 / D60-S7, D60P, PL-7, D65A, P-6, D65E-6, D65E-7 / D65P-7 / D65-S7, D65S-6, D68E, P1A, D75S-2, D75S-3, D80A-12, D80E-12, D80P-12, D85A-12, D85E-12, GD605A-2, GD655A-2, PC300-1, PC300-2, PC300LC-1, PC300LC-2, HD320-2, HD320-3, PC400-1, PC400LC-1, D80P-18, D85A-18, D85E-18, D85P-18, D95S-2

Applications with serial-number ranges

D53A-17 S/No. 80001-Up, D53P-17 S/No. 80001-Up, D58E-1 S/No. 80888-Up, D58E-1B S/No. 80888-Up, D58P-1 S/No. 80588-Up, D58P-1B S/No. 80588-Up, D65E-12 S/No. 60942-Up, D65EX-12 S/No. 60942-Up, D65P-12 S/No. 60884-Up, D65PX-12 S/No. 60884-Up, D75S-5 S/No. 15001-Up, D85A-21 S/No. 36534-Up, PC450-6-T2 / LC-6-T2 S/No. 10001-Up, D85A-21B S/No. 36537-Up, PC450LC-6K-KE S/No. 32106-Up, D85C-21A / C-21D S/No. 36551-Up, PW400MH-6 S/No. A84210-Up, D85E-21 S/No. 36534-Up, D85P-21 S/No. 3689-Up, D87P-2 S/No. P092001-Up, HD255-5 S/No. 1001-Up, WA450-3 / 3A-TW S/No. 53001-Up, WA450L-3 S/No. 53001-Up, PC400-6 / 6C / 6Z S/No. 30001-Up, PC400-6-T2 / LC6-T2 S/No. 30001-Up, PC400LC-6 S/No. 30001-Up, PC400LC-7L S/No. A86001-Up, PC450-6-A1 / LC-6-A1 S/No. 10001-Up, PC450-6K-J / LC-6K-J S/No. 10001-Up, PC450-6K-KE S/No. 32106-Up, D87E-2 S/No. P090001-Up, PC400LC-6 S/No. A83001-Up, PC400HD-6 S/No. A83001-Up, PC400HD-6LK S/No. A84001-A85000, PC400LC-6LK S/No. A84001-A85000, WA450-3 Avance Plus S/No. A31001-Up, WA470-3H Active S/No. H20942-Up, D65EX-12-E S/No. 60942-Up, WA470-5H S/No. 50051-Up, D65P-12-E S/No. 60884-Up, WA480-5L S/No. A37001-Up, D65PX-12-E S/No. 60884-Up, WA480-5-W S/No. 80001-Up, D85EX-15 S/No. 10001-Up, HM300-1 S/No. 1001-Up, WA450-5L S/No. A36001-Up, WA450-5-W S/No. 70001-Up, WA480-5 S/No. H50051-Up, WA500-1 S/No. 10001-Up & A20131-Up, WA500-1L S/No. A20854-Up, WA500-3 S/No. 50001-Up, D135A-2 S/No. 10301-Up, D155A-3 S/No. 60001-Up, D155AX-3 S/No. 60001-Up, GD825A-2 S/No. 11001-Up, PC1600SP-1 S/No. 10001-Up, PC1800-6 S/No. 10001-Up, D155A-5 S/No. 65001-Up, GD825A-1 S/No. 10002-Up, D155AX-5 S/No. 70001-Up, D355C-3-A S/No. 23933-Up, HD325-6 S/No. 5001-Up, D355C-3-DA S/No. 14263-Up, HD325-6Z S/No. 5001-Up, PC750-6 /LC-6 / SE-6 S/No. 10001-Up, HD405-6 S/No. 1001-Up, PC750LC-6K-01 S/No. K30001-Up, HD405-6 S/No. 5001-Up, PC750SE-6K / 6K-01 S/No. K30001-Up, WD500-3 S/No. 50001-Up, PC800-6 / SE-6 S/No. 30001-Up, PC650-3 S/No. 10501-Up, PC650LC-3 S/No. 10501-Up, PC650SE-3 S/No. 10501-Up, PC650-5 S/No. 20001-Up, PC650E-5 S/No. 20001-Up, PC650LC-5 S/No. 20001-Up, PC650SE-5 S/No. 20001-Up, PC710-5 / SE-5 S/No. 10001-Up, PC1600-1 S/No. 10063-Up, HD325-5 S/No. 2001-Up & A3027-Up, HD325-6/6W S/No. 5001-Up, PC-750-6-AW S/No. 11001-Up, PC-750LC-6-AW S/No. 11001-Up, PC750LC-6K-01 / SE-6K-01 S/No. K30001-Up, HM350-1 S/No. 1001-Up, PC-750SE-6-AW S/No. 11001-Up, HM400-1 S/No. 1001-Up, D275AX-5 S/No. 20001-Up, PC1800-6-T2 S/No. 10001-Up, PC600-6A-KJ / 6A-W1 S/No. 10001-Up, PC600-6K S/No. K30001-Up, WA500-3H S/No. 20051-Up, PC600LC-6A-CA / KJ / W1 S/No. 10001-Up, WA500-3LK S/No. 71001-Up, D475A-2 S/No. 10201-Up, WA800-2 S/No. 10001-Up, WA800-3 S/No. 50001-Up, WA900-1 S/No. 10001-Up, WA900-1L S/No. A20001-A20007, WA900-3 S/No. 50001-Up, HD785-3 S/No. 2001-Up, HD785-5 S/No. 4001-Up, HD985-3 S/No. 1001-Up, HD985-5 S/No. 1021-Up, WA800-2LC S/No. A20020-Up, WA800-3LC S/No. A50001-Up, WA900-1LC S/No. A20008-Up, WA900-3LC S/No. A50001-Up, D475A-3RP S/No. 10601-Up, HD785-5LC S/No. A10224-Up, D95S-1 S/No. 1003-1999, D150A-1 S/No. 5508-Up, D155A-1 S/No. 5508-Up, D155W-1 S/No. 12128-Up, D155A-2 S/No. 50001-Up, D155S-1 S/No. 1001-Up, D355A-3 S/No. 1010-Up, D355A-5 S/No. 12622-Up, D275A-2 S/No. 10001-Up, PC650-1 S/No. 10007-Up, WA600-1 S/No. 10001-Up, WA600-1 S/No. A10081-Up, WA600-1L S/No. A10391-Up, D375A-3 S/No. 17001-17500, D375A-3 S/No. 17501-Up, D375A-3AD / 3D S/No. 17001-Up, PC1000-1 S/No. 10001-Up, PC1000LC-1 S/No. 10001-Up, PC1000SE-1 S/No. 10001-Up, PC1000SP-1 S/No. 10001-Up, PC1100-6 S/No. 10001-Up, PC1100LC-6 S/No. 10001-Up, PC1100SP-6 S/No. 10001-Up, WA600-3 S/No. 50001-Up, WA700-1L S/No. A20001-Up, WA700-3 S/No. 50001-Up, WA700-3L S/No. A50001-Up, D375A-1 S/No. 15001-Up, D375A-2 S/No. , 16001-Up, WA700-1 S/No. 10001-Up, HD465-3 S/No. 2001-Up & A2060-Up, HD465-5 S/No. 4001-Up, HD605-5 S/No. 1001-Up, D375A-5 S/No. 18001-Up, HD465-7 S/No. 7001-Up, HD605-7 S/No. 7001-Up, PC1250-7 S/No. 310005-Up, PC1250LC-7 S/No. 310005-Up, PC1250SP-7 S/No. 310005-Up, WD600-3 S/No. 50001-Up, WA600-3C / 3D S/No. 50001-Up, WA600-3LK S/No. A53001-Up, WA700-3 / 3D S/No. 50001-Up, D375A-6 S/No. 60001-UP, D375A-6 S/No. 60001-UP (Mining Spec.), D375A-6R S/No. 65001-UP, D375A-5 S/No. 55001-UP (W/O EGR), D375A-5E0 S/No. 50001-UP (ecot3), HD465-7E0 S/No. 10732-UP, HD465-7R S/No. 15352-UP, HD465-7R S/No. 16132-UP, HD465-7E0 S/No. 10001-10731 (ecot3), HD465-7R S/No. 15001-15351 (W/O EGR), HD605-7R S/No. 15001-15351 (W/O EGR), HD605-7E0 S/No. 10732-UP, HD605-7E0 S/No. 8001-10731 (ecot3), HD605-7R S/No. 15352-UP, PC1250SP-8 S/No. 30158-UP, PC1250LC-8 S/No. 30158-UP, PC1250-8 S/No. 30158-UP, PC1250-8R S/No. 35201-UP, PC1250SP-8R S/No. 35201-UP, PC1250-8R S/No. 35201-UP (Extreme Hot Area Arrangement), PC1250SP-8R S/No. 35201-UP (Extreme Hot Area Arrangement), PC1250-8R S/No. 35406-UP, PC1250-8R S/No. 35001-35200 (EGR-LESS), PC1250-8R S/No. 35001-35200 (W/O EGR, +55C DEGREE), PC1250SP-8R S/No. 35001-35200 (W/O EGR), PC1250SP-8 S/No. 30001-30157 (ecot3, For SP), PC1250-8 S/No. 30001-30157 (ecot3), WA600-6 S/No. 60001-60637 (ecot3), WA600-6 S/No. 60638-UP, WA600-6 S/No. 61052-UP (For KAL), WA600-6R S/No. 65001-UP (W/O EGR), WA600-6R S/No. 65021-UP, WD600-6 S/No. 55001-55003, WD600-6 S/No. 55004-UP, D475A-1 S/No. 10001-Up, WA800-1 S/No. 10001-Up, HD785-2 S/No. 1501-Up, D575A-2SD S/No. 10001-Up, D575A-2SR S/No. 10001-Up, D575A-3 S/No. 10101-Up, D60A-7 S/No. 40001-Up, D60E-6 S/No. 20295-Up, D60E-7 / D60-S7 S/No. 40001-Up, D60P, PL-7 S/No. 40001-Up, D65A, P-6 S/No. 20006-Up, D65E-6 S/No. 20295-Up, D65E-7 / D65P-7 / D65-S7 S/No. 40001-Up, D65S-6 S/No. 20006-Up, D68E, P1A S/No. B10001-Up, D75S-2 S/No. 1004-Up, D75S-3 S/No. 7001-Up, D80A-12 S/No. 10001-24999, D80E-12 S/No. 10001-24999, D80P-12 S/No. 10001-24999, D85A-12 S/No. 10001-Up, D85E-12 S/No. 10001-24999, GD605A-2 S/No. 53001-Up & 56001-Up, GD655A-2 S/No. 63001-Up & 66001-Up, PC300-1 S/No. 1001-Up, PC300-2 S/No. 11001-Up, PC300LC-1 S/No. 11001-Up, PC300LC-2 S/No. 11001-Up, HD320-2 S/No. 1005-Up, HD320-3 S/No. 2501-Up, PC400-1 S/No. 10001-Up, PC400LC-1 S/No. 10001-Up, D80P-18 S/No. 2001-Up, D85A-18 S/No. 25001-Up, D85E-18 S/No. 25001-Up, D85P-18 S/No. 25001-Up, D95S-2 S/No. 2001-Up

How do I confirm fitment?

Match 600-421-6630 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 600-421-6630 fit every listed Komatsu machine?
No. Fitment is limited to the cataloged engine, application, and serial-number combinations. Confirm all identifying information before ordering.