Komatsu Engine Seal {Front Seal Kit} 6731-21-4220

Komatsu Engine Seal {Front Seal Kit} 6731-21-4220 is a Komatsu engine replacement part listed by 19PARTS for engine-section lookup, hub navigation, and part-number verification.

Product overview

Part number 6731-21-4220 is listed as Seal {Front Seal Kit}. Search also by the no-dash alternate number 6731214220.

Engine book references

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

• ENGINES / S6D102E-1 S/N .-UP / ENGINE / FRONT GEAR COVER (A2109-A2A2)
• ENGINES / S6D102E-1BB-6 S/N 26200163-UP / ENGINE / CYLINDER BLOCK GASKET KIT(#26213414-) (A8129-02A2)
• ENGINES / S6D102E-1C-6C S/N 26200163-UP / ENGINE / CYLINDER BLOCK GASKET KIT(#26213414-) (A8129-02A3)
• ENGINES / S6D102E-1C-6Z S/N 26200163-UP / ENGINE / CYLINDER BLOCK GASKET KIT(#26213414-) (A8129-02A3)
• ENGINES / S6D102E-1F-6 S/N 26200163-UP / ENGINE / CYLINDER BLOCK GASKET KIT(#26213414-) (A8129-02A3)
• ENGINES / S6D102E-1F-6S S/N 26200163-UP / ENGINE / CYLINDER BLOCK GASKET KIT(#26213414-) (A8129-02A3)

This part appears in 77 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.