Komatsu 6D125 Series Diesel Engine Shop Manual

Technical reference for the 1998 Komatsu 6D125 Series diesel engines, including S6D125 and SA6D125 models. Details structure, function, and maintenance. PN 00-1

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Technical Safety Notice
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This official OEM document is intended for professional technicians and skilled operators. Performing service on mechanical equipment involves inherent risks. By purchasing, you acknowledge that RepairLoader provides original manufacturer data for informational purposes. Always prioritize safety: use correct tools, wear protective gear, and consult a certified professional if you are uncertain of any procedure.

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
Build 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
Technical Specifications
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Document Number / Seller:
28724 / Rebecca Scott
File Size:
27.73 MB
File Type:
ZIP
Language:
Printable:
Yes
Category:
Diesel Engine
Last updated / verified
Mar 13, 2025

Komatsu Manual Features & Content Preview

Komatsu 6D125 Series Diesel Engine Technical Scope

  • Covers 1998 Komatsu 6D125, S6D125, and SA6D125 diesel engine series, documenting factory-standard specifications for diverse heavy-duty industrial, construction, and power generation machines
  • Official OEM publication P/N SEBE61500110, dated September 1998
  • Contains 47 detailed technical diagrams, including full cross-section engine assembly, turbocharger layouts, valve timing, and intake/exhaust system schematics
  • Delivered as a direct download the moment payment clears
  • Full-text search finds any part number in seconds
  • This 1998 edition provides the foundational design parameters, including assembly clearances and performance curves required for the 6D125-1 production build, distinct from later electronic injection model variants

Component and System Documentation

The Komatsu 6D125 series manual details engine architecture from the base block and cylinder head through the lubrication and cooling circuits. Explanations focus on the structural design of the intake system, valve train operation, and fuel system integration, including Bosch and Denso injection pump configurations. The text provides a comprehensive breakdown of engine subsystems, offering a clear understanding of the mechanical relationships between the piston, crankshaft, and auxiliary components found across the documented machine list.

Technical Data and Service Parameters

Specifications cover standard tightening torques for metric bolts, flared nuts, and O-ring boss joints. Torque for standard 12 mm bolts is 113 ± 10 Nm in the engine assembly data. The manual lists fluid capacities and lubrication requirements, including specialized gasket sealants and Molybdenum disulfide lubricants. Coolant capacity varies by machine, with the D75S-5 model specified at 65 liters. The idle speed range for the 6D125-1 engine series is documented between 600 and 700 rpm. This is an authoritative factory workshop publication documenting the 1998 production 6D125 diesel engine series, providing critical assembly, structural, and performance data for qualified mechanical technicians.

Manual FAQ, Purchase & Download Details

What standard tightening torque tables are listed for bolts and nuts within the manual? keyboard_arrow_down

Specification tables included in the document provide torque references for various thread diameters across multiple bolt grades and connector types.

Is there content showing exploded views or component illustrations for the engine assembly? keyboard_arrow_down

Manual contains structure and function sections that offer detailed material on engine components. These visual references support the identification of parts and their general layout.

Are there wiring diagrams or electric wire code tables included in the document? keyboard_arrow_down

Manual includes a dedicated section for electric wire codes which lists classifications by thickness and color. These reference tables correlate wire characteristics to specific circuit applications to assist in understanding the provided diagrams. Detailed wiring diagrams are also incorporated to support the overview of the electrical systems.

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