Komatsu Ring Set Piston 6128-31-2070

The Komatsu Ring Set Piston 6128-31-2070 is identified in the supplied parts catalog as a CYLINDER KIT & COMPONENTS for specific Komatsu diesel engine and equipment configurations. Cataloged engine models include S4D155-4, S6D155-4, and SA6D155-4. Listed machine applications include D95S-1, D150A-1, D155A-1, D155W-1, and D155A-2. Use the complete model and serial-number details below to compare this part with the equipment being serviced.

What is 6128-31-2070 used for?

Part number 6128-31-2070 is cataloged as a Ring Set Piston. It appears in the CYLINDER KIT & COMPONENTS parts group. The correct selection depends on the engine model, machine model, and the applicable serial-number range.

Compatible engine models

S4D155-4, S6D155-4, SA6D155-4

Engine models with serial-number ranges

S4D155-4 (Build 14) ? Not Provided | S6D155-4 (Build 14A) ? Not Provided | SA6D155-4 (Build 14B) ? Not Provided

Application models without serial numbers

D95S-1, D150A-1, D155A-1, D155W-1, D155A-2, D155S-1, D355A-3, D355A-5

Applications with serial-number ranges

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

How do I confirm fitment?

Match 6128-31-2070 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 6128-31-2070 fit every listed Komatsu machine?
No. Fitment is limited to the cataloged engine, application, and serial-number combinations. Confirm all identifying information before ordering.