Komatsu Engine O-Ring Seal 6745-21-7120

Komatsu Engine O-Ring Seal 6745-21-7120 is a Komatsu engine replacement part listed by 19PARTS for engine-section lookup, hub navigation, and part-number verification.

Product overview

Part number 6745-21-7120 is listed as O-Ring Seal. Search also by the no-dash alternate number 6745217120.

Engine book references

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

• ENGINES / SAA6D114E-3 S/N .-UP / ENGINE / CRANK CASE BREATHER (A1115-A3B2)
• ENGINES / SAA6D114E-3 S/N 26866736-up / A0 [ENGINE CYLINDER HEAD AND ITS RELATED PARTS] / BREATHER (|A00007)
• ENGINES / SAA6D114E-3A S/N .-UP / ENGINE / CRANK CASE BREATHER (A1115-A3B2)
• ENGINES / SAA6D114E-3A S/N 26850008-UP ( Export Standard ) / ENGINE CYLINDER BLOCK AND ITS RELATED PARTS / BREATHER (BR 9215-01)
• ENGINES / SAA6D114E-3A-WT S/N 26850001-UP / ENGINE / BREATHER AND TUBE (A111V-01A4)
• ENGINES / SAA6D114E-3AA-W S/N 26850001-UP / ENGINE / BREATHER AND TUBE(#26850852-26854326) (A111V-01A5Z)

This part appears in 30 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.