Komatsu S6D125-1EE(S/N 10001-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu S6D125-1EE (S/N 10001-UP) is a 6-cylinder, turbocharged, aftercooled diesel engine belonging to the 125-series family. It delivers approximately 275 hp (205 kW) and 1,010 lb-ft (1,370 Nm) of torque. This engine powers mid-to-heavy class Komatsu equipment, including the D65E-12 and D65PX-12 crawler dozers, PC400-5 and PC400-6 excavators, and WA470-3 wheel loaders. Production spans from the mid-1990s through the early 2000s, with an operating weight range for these machines typically between 35,000 and 80,000 lb (15,876 to 36,287 kg). It succeeded earlier naturally aspirated 6D125 variants and was later replaced by electronically controlled S6D125E-2 and SAA6D125E-2 engines in the D65EX-15 and PC400-7 generations.
The S6D125-1EE marks a transition in the 125-series lineage, introducing forced induction to the base chassis variants while retaining the robust mechanical fuel injection and wet liner architecture of the 6D125. Its significance in the used and parts market stems from its widespread installation across high-volume PC400 and D65 platforms. The engine's mechanical simplicity and lack of complex electronic emissions controls make it a preferred candidate for remanufacturing and long-term fleet maintenance. The large installed base ensures that aftermarket support for critical components like pistons, cylinder liners, and turbochargers remains robust and cost-effective.
Below: full specifications, fluids & capacities, the factory service schedule, common service parts, verified fault codes, what owners discuss, attachment guidance, the complete assembly directory, and a serial-number reference. Complete parts lists with full OEM part numbers, exploded diagrams, quantities, and fitment data are available free in Heavy Parts AI.
Komatsu S6D125-1EE(S/N 10001-UP) specifications
Engine
| Model | S6D125-1EE (S/N 10001-UP) |
| Type | 4-cycle, water-cooled, inline vertical, direct injection, turbocharged and aftercooled |
| Displacement | 11 liters |
| Cylinders | 6 |
| Gross Power | 202 kW (275 hp) |
| Net Power | 180 hp (134 kW) |
| Torque | 1,370 N·m (1,010 lbf·ft) |
| Emissions Tier | Not documented for this exact serial range — verify with your dealer |
Weights
| Operating Weight | Not documented for this exact serial range — verify with your dealer |
| Shipping Weight | Not documented for this exact serial range — verify with your dealer |
| Ground Pressure | Not documented for this exact serial range — verify with your dealer |
Dimensions
| Transport Length | Not documented for this exact serial range — verify with your dealer |
| Transport Width | Not documented for this exact serial range — verify with your dealer |
| Transport Height | Not documented for this exact serial range — verify with your dealer |
| Track Gauge | Not documented for this exact serial range — verify with your dealer |
| Ground Clearance | Not documented for this exact serial range — verify with your dealer |
Performance
| Travel Speed | Not documented for this exact serial range — verify with your dealer |
| Gradeability | Not documented for this exact serial range — verify with your dealer |
Service capacities (summary)
| Fuel Tank | Not documented for this exact serial range — verify with your dealer |
| Hydraulic System | Not documented for this exact serial range — verify with your dealer |
| Engine Oil | Not documented for this exact serial range — verify with your dealer |
| Cooling System | Not documented for this exact serial range — verify with your dealer |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
Komatsu S6D125-1EE(S/N 10001-UP) maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
Servicing the S6D125-1EE(S/N 10001-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
Monitor KOWA oil analysis results at every 500-hour interval to detect early wear metals in the splash-lubricated steering-clutch case and final drives. These systems lack independent filtration, making fluid cleanliness critical. Track coolant pH and SCA concentration closely; the S6D125-1EE uses wet cylinder liners that are highly susceptible to cavitation pitting if supplemental coolant additive depletes. A drop in SCA levels often precedes coolant leakage into the crankcase. Log trends in charge pressure and turbocharger boost to identify airflow restrictions before power loss occurs.
Corrective & Common Repairs
Address milky oil or steam from the breather on startup as immediate signs of coolant intrusion into the crankcase, usually caused by liner pitting or head gasket failure. Inspect the oil cooler element for internal cross-contamination between engine oil and coolant. Check the mechanical fuel injection pump for wear on the rack and governor linkage, which can cause erratic idle or loss of power. Verify the condition of the turbocharger shaft play and seal integrity, as excessive blow-by can accelerate oil degradation and reduce boost pressure.
Overhaul & Rebuild Points
Plan for an inframe overhaul when compression drops below specification or oil consumption exceeds limits, typically around 10,000 to 15,000 hours. Replace wet cylinder liners, pistons, and piston rings as a set to ensure proper sealing and heat transfer. Inspect the crankshaft for journal wear and replace main and rod bearings if clearance exceeds factory tolerances. During rebuild, replace the water pump, thermostat, and all engine seals to prevent post-repair leaks. Verify turbocharger housing cracks and impeller balance before reassembly.
Seasonal & Environment Servicing
In cold climates, verify coolant concentration and battery capacity before startup, as this mechanically governed engine lacks electronic cold-start assist beyond glow plugs or ether aids. In hot, dusty environments, shorten air cleaner service intervals and keep the radiator core and oil cooler fins clear of debris to prevent overheating. Monitor engine oil viscosity changes in extreme temperatures; use Komatsu EO or equivalent heavy-duty diesel oil rated for the ambient conditions. Ensure the fan belt tension is correct to maintain adequate cooling fan speed in high-heat applications.
S6D125-1EE(S/N 10001-UP) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 07281-00197 | Clamp,(With Pre-Fuel Filter) | Fuel system service | Check fitment → |
| ND092220-0040 | Filter,Fuel | Fuel system service | Check fitment → |
| 6125-81-7032 | Element Ass'Y,Air Cleaner | Air intake service | Check fitment → |
| 600-181-4300 | Element Ass'Y,Outer | Scheduled service item | Check fitment → |
| ND090438-0420 | Shim? 1.9mm,Element Holder | Scheduled service item | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
S6D125-1EE(S/N 10001-UP) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| CA115 | Engine crankshaft speed sensor and backup speed sensor failure | Faulty speed sensor, broken wiring harness, or corroded connector at the pin interface | Replace the speed sensor and verify voltage at the pin connector |
| CA111 | Internal engine controller fault | Electronic Control Module (ECM) internal failure | Replace or reprogram the ECM |
| CA451 | Common rail pressure sensor feedback value too high | Malfunctioning rail pressure sensor or actual overpressure condition in the fuel system | Diagnose the fuel rail pressure sensor and check pump lines |
| CA452 | Common rail pressure sensor feedback value too low | Faulty rail pressure sensor or low fuel pressure supply | Diagnose the fuel rail pressure sensor and check pump lines |
| CA122 | Intake air pressure sensor feedback voltage too high | Intake pressure sensor malfunction or wiring issue | Verify the intake pressure sensor and wiring |
| CA123 | Intake air pressure sensor feedback voltage too low | Sensor short circuit or airflow restriction in the intake system | Check for a sensor short or an airflow restriction |
| CA153 | Intake air temperature sensor feedback voltage too high | Intake air temperature (IAT) sensor error | Replace or test the IAT sensor |
| CA154 | Intake air temperature sensor feedback voltage too low | Intake air temperature (IAT) sensor error | Replace or test the IAT sensor |
| CA234 | Engine overspeed | Throttle calibration error, engine load cycle issue, or operator misuse | Verify throttle calibration and engine load cycle |
| CA441 | Battery voltage too low | Weak battery, faulty alternator, or voltage regulator issue | Replace the alternator or battery; check the voltage regulator |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
S6D125-1EE(S/N 10001-UP) attachments & work tools
Motor Grader Attachments
The S6D125-1EE engine is explicitly linked to the GD750A-1 motor grader in factory equipment guides. This machine class utilizes standard grading blades and ripper configurations typical for high-output grading applications.
Crawler Dozer Blades
The engine powers the D65E-12, D65P-12, D65EX-12, and D65PX-12 dozer series. These models are equipped with straight-tilt blades for standard gauge configurations and wide-gauge low-ground-pressure swamp configurations. Factory guarding options include ROPS cabs and canopies, which affect machine height specifications.
Crawler Excavator Buckets
The S6D125-1EE and related 125-series engines are used in the PC400-5, PC400-7, and PC400LC-5/8 excavator families. Typical work tools include standard digging buckets and trenching buckets sized for the 20-ton class capacity. Hydraulic kit arrangements vary by generation, requiring specific flow rates for the associated main control relief valves.
Wheel Loader Buckets
The WA470-3 and WA470-3A wheel loaders utilize this engine family. Standard work tools include general-purpose and rock buckets. The machine class typically features a quick-coupler system for bucket attachment, with hydraulic connections routed through the loader boom structure.
All S6D125-1EE(S/N 10001-UP) assemblies by section
Every catalogued assembly group for the Komatsu S6D125-1EE(S/N 10001-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Accessory
Komatsu : S6d125-1ee(S/N 10001-Up) : Accessory : Air Compressor And Piping
| 07***12 | Gasket,(Without Air Compressor Type) (K2) | 4 |
| 07***12 | Gasket,(Without Air Compressor Type) (K1) | 8 |
| 07***16 | Gasket,Air Compressor Piping | 2 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Accessory : Air Compressor(#10001-38810)
| 61***10 | Air Compressor Ass'Y,(See Fig.0711) | 1 |
| DK***20 | Connecting Rod A | 1 |
| DK***00 | Spring,Delivery Valve | 1 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Accessory : Air Compressor(#38811-)
Cooling System
Komatsu : S6d125-1ee(S/N 10001-Up) : Cooling System : Cooling Fan And Mounting
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 22 |
| 01***40 | Bolt, Mount Master Brake Cylinder | 2 |
| 01***95 | Bolt,(For 2nd Travel Speed) (Op) | 2 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Cooling System : Cooling Fan And Mounting (Suction Fan Type)
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 16 |
| 01***40 | Bolt, Mount Master Brake Cylinder | 2 |
| 01***55 | Bolt, Mount Tube To Switch Pump | 6 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Cooling System : Corrosion Resistor And Piping
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***08 | Nut,(For Canvas Canopy?Head Guard) | 1 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Cooling System : Water Pump And Mounting
| 01***16 | Bolt (With Air Heater & Conditioner) | 6 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
Cylinder Block
Komatsu : S6d125-1ee(S/N 10001-Up) : Cylinder Block : Camshaft
| 01***22 | Bolt | 2 |
| 04***25 | Key, Plain Woodruff | 1 |
| 04***12 | Ring,Snap (For Ripper) | 12 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Cylinder Block : Crankshaft
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 6 |
| 01***30 | Screw | 1 |
| 01***35 | Screw | 5 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Cylinder Block : Cylinder Block
| 01***12 | Bolt,(Without Air Compressor Type) | 2 |
| 01***45 | Washer,(For Travel Motor) (Not Show) | 14 |
| 04***14 | Pin, Dowel | 2 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Cylinder Block : Cylinder Block Cover
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***08 | Nut,(For Canvas Canopy?Head Guard) | 2 |
| 01***16 | Washer,Radio Controlled Slag Handling | 2 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Cylinder Block : Flywheel And Flywheel Housing
| 01***40 | Bolt,(Dust And Dirt Protection) | 2 |
| 01***50 | Bolt, Radiator To Frame | 6 |
| 01***70 | Bolt - Thrust Plate Mounting | 2 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Cylinder Block : Front Cover And Gear
| 01***25 | Bolt,(Without Auto Priming System) | 6 |
| 01***60 | Screw | 1 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Cylinder Block : Oil Pan
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 31 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 7 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Cylinder Block : Piston And Connecting Rod
| 02***13 | Pin, Dowel | 2 |
| 04***18 | Ring, Snap | 12 |
| 61***31 | Piston Ring Ass'Y | 6 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Cylinder Block : Power Take Off (1/2)
| 01***35 | Bolt, Bolt, Mount Tubes To Switch And Work Pumps | 6 |
| 01***40 | Bolt,(With Service Valve R.H.) | 6 |
| 01***45 | Bolt | 6 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Cylinder Block : Power Take Off (2/2)
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 6 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 12 |
Cylinder Head
Komatsu : S6d125-1ee(S/N 10001-Up) : Cylinder Head : Air Cleaner And Connection
| 01***40 | Bolt,(Dust And Dirt Protection) | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Cylinder Head : Air Intake Manifold
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 14 |
| 01***55 | Bolt, Mount Tube To Switch Pump | 2 |
| 01***00 | Bolt, Mount Back-Up Alarm | 2 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Cylinder Head : Cylinder Head(#26751-)
| 04***20 | Pin,Dowel (Welded) | 2 |
| 61***30 | Sleeve,Holder | 1 |
| 61***20 | Cotter, Valve | 48 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Cylinder Head : Exhaust Manifold And Turbocharger
| 01***80 | Bolt, Mount Strainer Flange | 2 |
| 01***00 | Bolt (M10-1.50x100) | 18 |
| 01***45 | Screw | 4 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Cylinder Head : Muffler
| 01***40 | Bolt,(Dust And Dirt Protection) | 4 |
| 01***55 | Bolt,(For Suction? Reversible Fan) | 4 |
| 01***30 | Bolt,Radio Controlled Slag Handling | 4 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Cylinder Head : Rocker Arm And Housing
| 01***95 | Bolt,(For 2nd Travel Speed) (Op) | 2 |
| 01***08 | Nut,R.H. Thread | 12 |
| 01***16 | Washer,Radio Controlled Slag Handling | 42 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Cylinder Head : Rocker Arm Housing Cover
| 01***16 | Washer,Radio Controlled Slag Handling | 24 |
| 61***11 | Cover,Head? No.2?3?4?5?6 | 6 |
| 61***10 | Gasket,Cylinder Head Cover | 6 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Cylinder Head : Turbocharger(#23599-)
| 61***10 | Turbocharger Ass'Y,(Ta4532) | 1 |
| GA***60 | V-Band | 1 |
| GA***52 | Center Housing A | 1 |
Electrical System
Komatsu : S6d125-1ee(S/N 10001-Up) : Electrical System : Alternator (35a)
| 60***60 | Alternator A. (35a),(With Non Hardening Pulley) | 1 |
| KD***57 | Bearing,Ball? Front | 1 |
| KD***80 | Collar | 1 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Electrical System : Alternator (50a)
| 60***30 | Alternator A. (50a),(With Non Hardening Pulley) | 1 |
| SD***X0 | Pulley,Non Hardening | 1 |
| SD***X0 | Coil Assembly | 1 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Electrical System : Alternator And Mounting (35a)
| 01***90 | Bolt, Fan Mounting | 1 |
| 01***30 | Bolt | 1 |
| 01***23 | Washer,(A)(W/After Cooler)(S6d155-4b) | 2 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Electrical System : Alternator And Mounting (50a)
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
| 01***30 | Bolt | 1 |
| 01***23 | Washer,(A)(W/After Cooler)(S6d155-4b) | 2 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Electrical System : Starting Motor (11kw)
| 60***31 | Starting Motor Ass'Y,(11kw) | 1 |
| SD***00 | Metal | 1 |
| SD***60 | O-Ring | 2 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Electrical System : Starting Motor (7.5kw)
| 60***30 | Starting Motor Ass'Y,(7.5kw) | 1 |
| KD***20 | Magnetic Switch Assembly | 1 |
| KD***40 | Spring,Spring | 4 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Electrical System : Starting Motor And Mounting (11kw)
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 1 |
| 01***40 | Bolt,(With Center Guard) | 3 |
| 60***20 | Clip,(Large Capacity Type) | 1 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Electrical System : Starting Motor And Mounting (7.5kw)
| 01***40 | Bolt,(With Center Guard) | 3 |
| 66***10 | Gasket,Starting Motor | 1 |
| (6***0) | Starting Motor Ass'Y,(7.5kw) (See Fig.A6210-B4a3) | 1 |
Engine Kit
Komatsu : S6d125-1ee(S/N 10001-Up) : Engine Kit : Gasket Kit
| 01***23 | Washer,Lock (K5) | 1 |
| 02***43 | O-Ring,Water Manifold | 6 |
| 07***10 | O-Ring,(F4350-62a0 -5 ), O-Ring; Komatsu S/N 22***01 & Abv - Was 07000-02010, O-Ring; Was 07000-02010 | 1 |
Fuel System
Komatsu : S6d125-1ee(S/N 10001-Up) : Fuel System : Fuel Filter And Piping
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 6 |
| 01***08 | Nut,(For Canvas Canopy?Head Guard) | 2 |
| 01***16 | Washer,Radio Controlled Slag Handling | 2 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Fuel System : Fuel Injection Pump (Coupling)
| ND***50 | Bolt | 1 |
| ND***40 | Bolt | 2 |
| ND***61 | Bolt | 6 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Fuel System : Fuel Injection Pump (Feed Pump)
| ND***61 | Feed Pump Ass'Y | 1 |
| ND***40 | Washer? 1mm,Plate | 1 |
| ND***70 | Washer,Union | 4 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Fuel System : Fuel Injection Pump (Governor) (1/2)
| ND***40 | Plate,Thrust | 1 |
| ND***40 | Plug,Screw | 1 |
| ND***60 | Governor Ass'Y | 1 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Fuel System : Fuel Injection Pump (Governor) (2/2)
| ND***20 | Washer? 1.0mm,Cover Plate | 2 |
| ND***30 | Lever,Adjusting | 1 |
| ND***70 | Packing,Rubber Plate | 1 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Fuel System : Fuel Injection Pump (Pump) (1/2)
| 61***50 | Injection Pump Ass'Y | 1 |
| ND***50 | Ring,Adjust | 1 |
| ND***80 | O-Ring | 1 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Fuel System : Fuel Injection Pump (Pump) (2/2)
| ND***70 | O-Ring | 6 |
| ND***71 | Rack,Control | 1 |
| ND***50 | Seat,Spring? Lower | 6 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Fuel System : Fuel Injection Pump And Piping
| 01***75 | Bolt,(See Fig.0142) | 4 |
| 01***30 | Bolt | 4 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Fuel System : Fuel Nozzle And Spill Pipe(#23599-)
| 01***45 | Bolt, Divider Valve Mounting | 12 |
| 07***65 | O-Ring,Cylinder Block | 6 |
| 07***12 | Gasket,Mechanical Pump Piping | 2 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Fuel System : Water Separator And Piping (Sandy And Dusty Spec.)
| 01***30 | Bolt,(For France Noise Suppression) | 2 |
| 01***70 | Bolt | 4 |
| 01***16 | Washer,Radio Controlled Slag Handling | 2 |
Lubricating Oil System
Komatsu : S6d125-1ee(S/N 10001-Up) : Lubricating Oil System : Lubricating Oil Cooler
| 01***25 | Bolt,Without Revolution Sensor | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 12 |
| 01***65 | Bolt,(Except Japan) | 2 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Lubricating Oil System : Lubricating Oil Filter
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 8 |
| 02***16 | Plug | 1 |
| 04***12 | Ring, Snap | 1 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Lubricating Oil System : Lubricating Oil Piping
| 01***50 | Bolt,(With Service Valve R.H.) | 4 |
| 01***16 | Washer,Radio Controlled Slag Handling | 7 |
| 04***12 | Ring, Snap | 1 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Lubricating Oil System : Lubricating Oil Pump And Suction Pipe
| 01***25 | Bolt,(Without Auto Priming System) | 4 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 2 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 5 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Lubricating Oil System : P.T.O. Lubricating Oil Piping
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***40 | Bolt,(With Service Valve R.H.) | 1 |
| 07***12 | Gasket,(Without Air Compressor Type) (K2) | 23 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Lubricating Oil System : Torque Converter Cooler
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 11 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 3 |
Komatsu : S6d125-1ee(S/N 10001-Up) : Lubricating Oil System : Turbocharger Lubricating Oil Piping
| 01***20 | Bolt,(With Auto Emergency Steering) | 2 |
| 01***30 | Bolt,(For Mechanical Governor) | 2 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 2 |
S6D125-1EE(S/N 10001-UP) serial number reference
The engine serial plate is riveted to the engine block, typically on the left side near the injection pump or on the valve cover. The prefix is the first portion of the engine model code (e.g., S6D125-1EE), not a separate 3-character PIN; the PIN is a 17-character ISO code found on the emissions/export plate. Read the engine model code directly from the plate to identify the series and generation.
| Prefix | Identifies | Notes |
|---|---|---|
| S6D125-1EE | Engine Model | Identifies the S6D125-1EE engine family. Serial range 10001-UP applies to this engine designation within the GD750A-1 motor grader series (per DK Engine Parts Equipment Guide). Also listed as a standalone engine catalog variant S/N 10001-UP (per published references). No specific machine model prefix (e.g., GD, PC) is tied to this engine serial range in the provided sources; the engine is used across multiple Komatsu platforms (e.g., D65 dozers, WA470 loaders) but the 10001-UP range is explicitly linked to the GD750A-1 in the equipment guide. |
Frequently asked questions
What is the engine type for the Komatsu S6D125-1EE?
It is a 6-cylinder, 4-stroke, water-cooled, turbocharged, and aftercooled diesel engine with a displacement of approximately 11 liters.
What is the operating weight of machines using this engine?
Operating weight varies by configuration and series, typically ranging from 15,876 to 36,287 kg (35,000 to 80,000 lb) for the D65 and PC400 class equipment.
What engine replaced the S6D125-1EE?
It was superseded by the electronically controlled, turbocharged S6D125E-2 and SAA6D125E-2 engines introduced in the D65EX-15 and PC400-7 generations.
What S6D125-1EE(S/N 10001-UP) owners discuss
What are the known powertrain and hydraulic behaviors for machines using the S6D125-1EE engine?
What undercarriage or wear patterns are typical for this machine type?
What are the engine quirks per the S6D125-1EE series?
What are common electrical or sensor issues reported?
What should be checked when buying a used machine with the S6D125-1EE (S/N 10001-UP)?
What fluid specifications are recommended for this engine?
What is a safety-critical fix related to the cooling system?
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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