Komatsu Engine O-Ring 6743-51-9950

Komatsu Engine O-Ring 6743-51-9950 is a Komatsu engine replacement part listed by 19PARTS for engine-section lookup, hub navigation, and part-number verification.

Product overview

Part number 6743-51-9950 is listed as O-Ring. Search also by the no-dash alternate number 6743519950.

Engine book references

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

• ENGINES / SAA12V140E-3A S/N 500001-UP / ENGINE / PRE LUBRICATION PIPING (EXTREMELY BAD FUEL AND POOR FUEL ARRANGEMENT SPEC.) (WATER+DUST)(#500999-) (A9320-A7A9)
• ENGINES / SAA12V140E-3A S/N 502127-UP (For D475A-5E0/D475ASD-5E0) / ENGINE LUBRICATION SYSTEM / PRE LUBRICATION PIPING / PRE LUBRICATION PIPING, (#505571-) (A9320-001001A)
• ENGINES / SAA12V140E-3A S/N 502127-UP (For D475A-5E0/D475ASD-5E0) / ENGINE LUBRICATION SYSTEM / PRE LUBRICATION PIPING, FOR EXTRA BAD FUEL AND POOR FUEL SPECIFICATION, WATER+DUST, ADDITIONAL FILTER / PRE LUBRICATION PIPING (#502249-) (A9320-002001)
• ENGINES / SAA12V140E-3B S/N 500001-UP / ENGINE / PRE LUBRICATION PIPING(#500801-) (A9320-A7B1)
• ENGINES / SAA12V140E-3B S/N 505077-UP (For HD785-7) / ENGINE LUBRICATION SYSTEM / PRE LUBRICATION PIPING, FOR ENGINE PRE-LUBRICATION SYSTEM / PRE LUBRICATION PIPING (#505077-) (A9320-003001)
• ENGINES / SAA12V140E-3B-02 S/N 500001-UP / ENGINE / PRE LUBRICATION PIPING(#500801-) (A9320-A7B1)

This part appears in 16 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.