Komatsu 6D125 Series Diesel Engine Shop Manual
Komatsu Models Covered & Key Technical Specifications
Models: Komatsu 6D125, S6D125, SA6D125, 6D125-1, S6D125-1, SA6D125-1
Sub-models / Variants: D50A-17, D50F-17, D53A-17, D53P-17, D58E-1, D58P-1, D60A-8, D60E-8, D60P-8, D60PL-8, D60S-8, D63E-1, D65A-8, D65E-8, D65P-8, D65S-8, D65E-12, D68E-1, D68P-1, D70LE-1, D75S-5, D83E-1, D83P-1, D85A-21, D85E-21, D85P-21, GD600R-3, GD605R-3, GD605A-3, GD613A-1, GD623A-1, GD622A-1, GD625A-1, GD625A-1C, GD633A-1, GD655A-3, GD650R-3, GD655R-3, GD705R-3, GD705R-4, PC300-3, PC300LC-3, PC360LC-3, PC400-3, PC400LC-3, PC400LC-5, HD200D-3, HD205-3, WA450-1, WA470-1, WF450T-1, EC260Z-1, EG200-3, EG220, EG220BS-2, HA250, HA270, D135A-1, EG275
Model Years: 1998
Serial Numbers: D75S-5 (SN 10001–23192, 23193 and up), PC300-3 (SN 10001–20727, 20728–23688, 23689 and up), PC400-3 (SN 10001–23750, 23751 and up), GD705A-4 (SN 10001–23598, 23599 and up)
Technical Data:
- Engine configuration: 6-cylinder, 4-cycle diesel, 11,040 cc displacement
- Bore x Stroke: 125 x 150 mm
- Low idling speed: 600–700 rpm
- Firing order: 1–5–3–6–2–4
- Starting system: 24V, 7.5 kW or 11 kW motor
- Turbocharger types: Garrett TV77, T45, TO4B, TO4E
Komatsu Manual Features & Content Preview
Komatsu 6D125 Series Diesel Engine Technical Reference
This manual eliminates guesswork on the shop floor by providing the exact factory specifications needed to maintain and service heavy-duty industrial, construction, and power generation machines.
- Covers the 1998 Komatsu 6D125, S6D125, and SA6D125 diesel engine series.
- Official OEM publication P/N SEBE61500110 (September 1998).
- Includes 47 detailed technical diagrams, featuring full cross-section engine assemblies, turbocharger layouts, and valve timing schematics.
- Available as an instant download directly to your device.
- Fully searchable PDF format to locate specific part numbers and specs in seconds.
Component and System Architecture
The documentation breaks down the engine architecture from the base block and cylinder head through the lubrication and cooling circuits. It provides technicians with a clear understanding of the intake system structural design, valve train operation, and fuel system integration for both Bosch and Denso injection pump configurations. You get a complete overview of the mechanical relationships between the piston, crankshaft, and auxiliary components. Understanding these precise internal tolerances is critical for safe operation and preventing catastrophic component failure under high loads. This specific 1998 edition delivers the foundational assembly clearances required for the 6D125-1 production build, distinctly setting it apart from later electronic injection models.
Technical Data and Service Parameters
When precision matters, this reference delivers the exact numbers. You will find standard tightening torques for metric bolts, flared nuts, and O-ring boss joints. For instance, the required torque for standard 12 mm bolts is strictly rated at 113 ± 10 Nm. The text outlines exact fluid capacities and lubrication requirements, including where to apply specialized gasket sealants and Molybdenum disulfide lubricants. Machine-specific data is also detailed, such as the 65-liter coolant capacity for the D75S-5 model and the standard 600 to 700 rpm idle speed range.
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