Komatsuengine(no series)
Komatsu S6D102E-1X(S/N 26200929-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu S6D102E-1X engine is a six-cylinder, 5.9-liter inline diesel powerplant used in mid-size crawler excavators, wheel loaders, and bulldozers. It delivers approximately 140 horsepower and operates at 2000 rpm. This engine powers the PC200-6, PC210-6, and PC228-6 excavator series, as well as the WA180-3 wheel loader and D41E-6 bulldozer. Production years for these models span the late 1990s through the early 2000s. The machine class typically ranges from 20 to 25 tons operating weight. The S6D102E-1X succeeded earlier mechanical injection engines and was later replaced by the electronically controlled SAA6D102E-2 series to meet stricter emissions standards.
Across generations, the shift from the S6D102E-1X to the SAA6D102E-2 introduced electronic control units and advanced fuel injection systems for improved efficiency and lower emissions. The S6D102E-1X remains significant in the used and parts market due to its mechanical simplicity, durability, and widespread use in the highly popular PC200 and PC210 excavator lines. Its robust iron block and reliable low-end torque make it a preferred choice for heavy-duty construction and mining applications. The engine's longevity and the availability of aftermarket support ensure its continued relevance for fleet managers seeking cost-effective power solutions.
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 S6D102E-1X(S/N 26200929-UP) specifications
Engine
| Model | S6D102E-1X |
| Series/Generation | 102 Series (102-1) |
| Configuration | 6-cylinder in-line, turbocharged diesel |
| Displacement | 5.9 L (359 cu in) |
| Bore | 102 mm (4.02 in) |
| Stroke | 120 mm (4.72 in) |
| Compression Ratio | 16.5:1 |
| Gross Power | 134–157 kW (180–210 hp) @ 2500 rpm |
| Net Power | 134–157 kW (180–210 hp) @ 2500 rpm |
| Torque | 420–450 N·m (310–330 lb·ft) @ 1500 rpm |
| Emissions Tier | Not documented for this exact serial range — verify with your dealer |
Weights
| Engine Weight | 466 kg (1025 lb) |
| 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
| Engine Length | 1067 mm (42 in) |
| Engine Width | 711 mm (28 in) |
| Engine Height | 894 mm (35 in) |
| 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 |
| Dig Depth | Not documented for this exact serial range — verify with your dealer |
| Bucket Capacity | Not documented for this exact serial range — verify with your dealer |
Service capacities (summary)
| Engine Oil Capacity | Not documented for this exact serial range — verify with your dealer |
| Cooling System Capacity | Not documented for this exact serial range — verify with your dealer |
| Hydraulic System Capacity | Not documented for this exact serial range — verify with your dealer |
| Fuel Tank Capacity | 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 S6D102E-1X(S/N 26200929-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 S6D102E-1X(S/N 26200929-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
Implement Komatsu KOWA fluid analysis at every 500-hour interval to monitor engine wear metals and coolant contamination. Track hydraulic particle counts and viscosity changes to predict pump and valve failures. Use KOMTRAX telematics to monitor load frequency and fault codes for early detection of turbocharger or injector issues. Regularly test coolant SCA levels to prevent liner cavitation in the 5.9-liter block. Analyze fuel dilution and soot levels in the engine oil to determine optimal change intervals based on actual operating conditions rather than fixed schedules.
Corrective & Common Repairs
Address common S6D102E-1X failures by inspecting the mechanical fuel injection pump for internal wear and leakage. Check the turbocharger shaft play and bearing condition for signs of oil starvation or debris ingestion. Replace worn piston rings and cylinder liners if compression drops or excessive blow-by occurs. Inspect the oil cooler core for clogging or internal cross-contamination between oil and coolant. Verify the integrity of the fuel water separator and replace the primary fuel filter to protect the injection system from contamination.
Overhaul & Rebuild Points
Plan for an inframe overhaul when engine hours reach 10,000 to 15,000, depending on maintenance history. Replace piston assemblies, cylinder liners, and main bearings during this stage. Inspect the crankshaft for journal wear and the cylinder head for valve seat recession. Replace the turbocharger if shaft end-play exceeds specifications or if compressor blades show damage. Rebuild the mechanical fuel injection pump and calibrate injector spray patterns to restore optimal combustion efficiency and fuel economy.
Seasonal & Environment Servicing
In cold climates, use low-temperature grade Komatsu engine oil and ensure the coolant mixture provides adequate freeze protection. Install block heaters to maintain engine temperature during extended idling. In dusty environments, inspect the air filter restriction indicator frequently and clean the outer element more often. Check the radiator and oil cooler fins for debris buildup that restricts airflow. In high-altitude applications, verify that the mechanical fuel injection pump timing is adjusted to maintain rated horsepower and prevent excessive smoke.
S6D102E-1X(S/N 26200929-UP) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 07281-00197 | Clamp,(With Pre-Fuel Filter) | Fuel system service | Check fitment → |
| 6732-71-6111 | Filter, Fuel - Secondary | Fuel system service | Check fitment → |
| 600-181-6740 | Element Assembly, Innner And Outer Air Cleaner | Air intake service | Check fitment → |
| 6732-21-5530 | Cartridge, Engine Oil Filter | Lubrication service | Check fitment → |
| 6735-51-5141 | Filter, Lubrication Oil | Lubrication service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
S6D102E-1X(S/N 26200929-UP) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| CA115 | Engine crankshaft speed sensor and backup speed sensor failure | Broken sensor, wiring issue, or connector corrosion | Replace the speed sensor and verify the voltage at the pin connector |
| CA451 | Common rail pressure sensor feedback value too high | Malfunction in the rail sensor or actual overpressure condition | Diagnose the fuel rail pressure sensor or pump lines |
| CA122 | Intake air pressure sensor feedback voltage too high | Faulty intake pressure sensor or wiring issue | Verify the intake pressure sensor and wiring |
| CA123 | Intake air pressure sensor feedback voltage too low | Sensor short or airflow restriction | Check for a sensor short or an airflow restriction |
| CA441 | Battery voltage too low | Weak battery or charging system failure | Replace the alternator or battery; check the voltage regulator |
| CA442 | Battery voltage too high | Faulty voltage regulator or alternator | Replace the alternator or battery; check the voltage regulator |
| CA111 | Internal engine controller fault | ECM hardware or software failure | Replace or reprogram the ECM |
| AA10NX | Air cleaner clogging | Dirty or blocked air filter element | Replace the air filter |
| CA234 | Engine overspeed | Throttle calibration error, engine load cycle issue, or operator misuse | Verify throttle calibration, engine load cycle, or operator misuse |
| CA153 | Intake air temperature sensor feedback voltage too high | Faulty intake air temperature (IAT) sensor | Replace or test the IAT sensor |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
S6D102E-1X(S/N 26200929-UP) attachments & work tools
Excavator Attachments
The S6D102E-1X engine is primarily associated with the PC200-6, PC210-6, and PC220-6 hydraulic excavator series. Typical bucket capacities for this class range from 1.1 to 1.6 cubic yards (0.8 to 1.2 cubic meters). Mounting systems utilize standard quick couplers compatible with the machine's boom and stick geometry.
Wheel Loader Attachments
This engine powers the WA180-3 and WA250-3 wheel loader series. Standard bucket sizes for these models typically range from 2.5 to 4.5 cubic yards (1.9 to 3.4 cubic meters). Configurations include standard, heavy-duty, and rock buckets, often equipped with side-cutting edges and teeth.
Bulldozer Attachments
The D41E-6 and D41E-6K bulldozer models utilize this engine class. Blade options include straight (SD) and semi-universal (SU) blades. Blade capacities vary by configuration, typically ranging from 10 to 14 cubic yards (7.6 to 10.7 cubic meters), with varying degrees of tilt and angle capabilities.
Hydraulic System Notes
Work tools require high-flow hydraulic circuits to operate auxiliary functions such as tilt rotators or grapples. The engine's hydraulic pump arrangement must support the flow rates specified for the selected attachment. Factory guarding options include high-pressure hose guards and boom protection plates.
All S6D102E-1X(S/N 26200929-UP) assemblies by section
Every catalogued assembly group for the Komatsu S6D102E-1X(S/N 26200929-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Engine
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Air Cleaner (With Extension Pipe)
| 01***85 | Screw | 2 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 3 |
| 01***30 | Bolt - Lower Oil Cooler Outlet Tubemounting | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Air Connector(#26204449-)
| 07***08 | Plug,(Without Auto Priming System) | 1 |
| 67***10 | Plug, Pipe (1/2-14 Npt) | 2 |
| 67***20 | Plug, Pipe (3/4 Nptf) | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Air Intake Heater
| 67***10 | Gasket | 1 |
| 67***11 | Gasket,Air Intake Heater | 1 |
| 67***10 | Harness, Wiring | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Alternator (35a) (Brushless Type) (Inner Parts)(#26200929-26239464)
| 60***11 | Alternator A. (35a) | 1 |
| KD***70 | Bushing,Insulate | 1 |
| KD***50 | Regulator Ass'Y | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Alternator (35a) (Brushless Type) (Inner Parts)(#26239465-)
| 60***11 | Alternator A. (35a) | 1 |
| KD***70 | Bushing,Insulate | 1 |
| KD***50 | Regulator Ass'Y | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Alternator (35a) (Brushless Type)(#26200929-26239464)
| (6***1) | Alternator A. (35a),(See Fig.A601p-02a7z) | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Alternator (35a) (Brushless Type)(#26239465-)
| (6***1) | Alternator A. (35a),(See Fig.A601p-02a7z) | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Alternator (50a) (Inner Parts)(#26200929-26239267)
| 60***10 | Alternator A. (50a) | 1 |
| KD***70 | Bushing,Insulate | 2 |
| KD***40 | Bushing,Insulate | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Alternator (50a) (Inner Parts)(#26200933-)
| 60***10 | Alternator A. (50a) | 1 |
| KD***70 | Bushing,Insulate | 2 |
| KD***40 | Bushing,Insulate | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Alternator (50a) (Inner Parts)(#26239268-)
| 60***10 | Alternator A. (50a) | 1 |
| KD***70 | Bushing,Insulate | 2 |
| KD***40 | Bushing,Insulate | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Alternator (50a)(#26200929-26239267)
| (6***0) | Alternator A. (50a),(See Fig.A601p-02a4z) | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Alternator (50a)(#26200933-)
| (6***0) | Alternator A. (50a),(See Fig.A601p-02a4z) | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Alternator (50a)(#26239268-)
| (6***0) | Alternator A. (50a),(See Fig.A601p-02a4z) | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Alternator Mounting (For 35a? 50a Alternator)(#26200936-)
| 01***30 | Bolt,(For Trimming Dozer) | 1 |
| 01***10 | Nut,(Without Air Conditioner) | 1 |
| 01***23 | Washer,(With Car Heater) | 3 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Belt Tensioner (With 35a? 50a Alternator)(#26222494-)
| 67***41 | Tensioner, Alternator Belt | 1 |
| 67***30 | Tensioner, Alternator Belt | 1 |
| 67***20 | Bolt (M10x1.50x70) | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Breather Hose(#26206731-)
| 07***20 | Clamp, Spring Hose | 1 |
| 07***65 | Hose | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Camfollower Cover(#26232038-)
| 67***20 | Bolt, Mounting (M8-1.25x16) | 6 |
| 67***80 | Seal, Grommet | 6 |
| 67***60 | Cover, Push Rod | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Camshaft
| 67***20 | Support, Camshaft Thrust | 1 |
| 67***31 | Gear, Camshaft | 1 |
| 67***60 | Bolt (M8x1.25x22) | 2 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Caution Plate (Arabic)(#26222494-26259961)
| 09***08 | Plate? Instruction,Air Cleaner | 1 |
| 67***11 | Plate? Name | 1 |
| 67***60 | Plate? Name | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Caution Plate (Arabic)(#26255447-)
| 09***08 | Plate? Instruction,Air Cleaner | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Caution Plate (Chinese)(#26222494-26259961)
| 09***08 | Plate? Instruction,Air Cleaner | 1 |
| 67***11 | Plate? Name | 1 |
| 67***30 | Plate? Name | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Caution Plate (Chinese)(#26255447-)
| 09***08 | Plate? Instruction,Air Cleaner | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Caution Plate (English)(#26222494-26259961)
| 09***08 | Plate? Instruction,Air Cleaner | 1 |
| 67***11 | Plate? Name | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Caution Plate (English)(#26255447-)
| 09***08 | Plate? Instruction,Air Cleaner | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Caution Plate (French)(#26222494-26259961)
| 09***08 | Plate? Instruction,Air Cleaner | 1 |
| 67***11 | Plate? Name | 1 |
| 67***90 | Plate | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Caution Plate (French)(#26255447-)
| 09***08 | Plate? Instruction,Air Cleaner | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Caution Plate (German)(#26222494-26259961)
| 09***08 | Plate? Instruction,Air Cleaner | 1 |
| 67***11 | Plate? Name | 1 |
| 67***60 | Plate | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Caution Plate (German)(#26255447-)
| 09***08 | Plate? Instruction,Air Cleaner | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Caution Plate (Russian)(#26222494-26259961)
| 09***08 | Plate? Instruction,Air Cleaner | 1 |
| 67***11 | Plate? Name | 1 |
| 67***80 | Plate? Name | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Caution Plate (Russian)(#26255447-)
| 09***08 | Plate? Instruction,Air Cleaner | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Caution Plate (Spanish)(#26222494-26259961)
| 09***08 | Plate? Instruction,Air Cleaner | 1 |
| 67***11 | Plate? Name | 1 |
| 67***40 | Plate? Name | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Caution Plate (Spanish)(#26255447-)
| 09***08 | Plate? Instruction,Air Cleaner | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Caution Plate(#26216483-)
| 67***11 | Plate? Name | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Connector Clip
| 01***16 | Bolt - Starting Motor Ground Cable | 1 |
| 08***12 | Clip, Clip,(With Auto Emergency Steering) | 1 |
| 42***60 | Bracket | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Cooling Fan
| 01***30 | Bolt - Lower Oil Cooler Outlet Tubemounting | 6 |
| 01***35 | Bolt, Mount Bracket To Floor | 4 |
| 60***80 | Fan,Cooling | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Corrosion Resistor(#26222494-)
| 01***16 | Bolt, Mount Solenoid Valve | 1 |
| 01***40 | Bolt,(Shim 3-Piece) | 2 |
| 01***80 | Bolt (M10-1.50x80) | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Crank Pulley (Air Conditioner Pulley)
| 01***90 | Bolt,(For Large Fan) | 4 |
| 67***11 | Spacer | 1 |
| 67***10 | Pulley | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Crankshaft
| 67***50 | Gear, Crankshaft | 1 |
| 67***11 | Gear, Crankshaft | 1 |
| 67***10 | Crankshaft Ass'Y | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Cylinder Block Blind Cover And Fuel Filter Piping
| 07***12 | Gasket,Injection Pump Piping | 2 |
| 67***20 | Bolt, Flange (M8-1.25x20) | 2 |
| 67***10 | Screw, Banjo Connector (M12x1.50x24) | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Cylinder Block(#26222208-)
| 62***10 | Screw | 1 |
| 62***10 | Seal, O-Ring (M10-1.00) | 3 |
| 67***70 | Cylinder Block Ass'Y | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Cylinder Head
| 67***70 | Head Ass'Y | 1 |
| 67***10 | Retainer, Exhaust Valve Spring | 12 |
| 67***70 | Insert, Exhaust | 6 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Damper
| 67***20 | Bolt (M12x1.25x36) | 4 |
| 67***20 | Damper, Rubber Vibration | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Exhaust Connector Clamp
| 67***20 | Clamp,Turbocharger Outlet Pipe | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Exhaust Manifold Gasket And Bolt(#26201318-)
| 67***30 | Bolt, Mounting (M10x1.50x65) | 12 |
| 67***10 | Gasket, Exhaust Manifold | 6 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Exhaust Manifold(#26206782-)
| 67***20 | Manifold, Exhaust | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Fan Drive Pulley(#26233067-)
| 67***30 | Bearing,Roller | 1 |
| 67***70 | Bolt, Mounting (M8-1.25x40) | 4 |
| 67***20 | Support Ass'Y,Fan | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Flywheel Housing Plug And Spacer(#26210300-)
| 01***50 | Stud | 12 |
| 01***25 | Bolt - Relay Mounting | 1 |
| 01***25 | Bolt,(With Corrosion Resistor) | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Flywheel Housing(#26223714-26239105)
| 67***40 | Gasket, Cover Plate | 1 |
| 67***50 | Plug, O-Ring | 1 |
| 67***60 | Seal, O-Ring | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Flywheel Housing(#26239106-26264142)
| 67***30 | Plate, Cover | 1 |
| 67***50 | Plug, O-Ring | 1 |
| 67***61 | O-Ring,Bearing Cap | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Flywheel Housing(#26264143-)
| 02***13 | Plug | 1 |
| 67***40 | Cover, Rear | 1 |
| 67***20 | Bolt (M8-1.25x16) | 2 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Flywheel(#26200933-)
| 67***20 | Washer, Plain (M12) | 8 |
| 67***30 | Bolt (M12x1.25x32) | 8 |
| 67***80 | Gear, Flywheel Ring | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Front Cover(#26200929-26239105)
| 67***40 | Pin, Timing | 1 |
| 67***50 | Ring, Retaining | 1 |
| 67***60 | Screw, Round Head (M5-0.80x17) | 2 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Front Cover(#26239106-)
| 67***11 | Gasket | 1 |
| 67***40 | Pin, Timing | 1 |
| 67***50 | Ring, Retaining | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Front Gear Train Cover(#26200929-26264836)
| 67***80 | Gasket, Accessory Drive Cover | 1 |
| 67***10 | Plate, Accessory Drive Cover | 1 |
| 67***30 | Bolt, Flange Head (M12-1.75x25) | 2 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Front Gear Train Cover(#26264837-)
| 07***10 | O-Ring,(F4320-67a0 -4 ) | 1 |
| 67***30 | Cover | 1 |
| 67***30 | Bolt, Flange Head (M12-1.75x25) | 2 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Front Hanger
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 4 |
| 67***40 | Bracket | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Fuel Filter
| 67***40 | Bolt, (M8x1.25x35) | 2 |
| 67***10 | Cartridge,Fuel | 1 |
| 67***11 | Filter, Fuel - Secondary | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Fuel Filter Piping(#26204449-)
| 07***12 | Gasket,Injection Pump Piping | 2 |
| 67***60 | Tube, Fuel Supply | 1 |
| 67***70 | Clamp, Tube | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Fuel Hose
| 01***40 | Bolt | 1 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 1 |
| 07***40 | Hose,See Fig. K4010-05a0 | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Fuel Injection Pump (Feed Pump) (Inner Parts)
| DK***20 | Bolt, Joint | 1 |
| DK***60 | Feed Pump Ass'Y | 1 |
| DK***00 | Valve,Check | 2 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Fuel Injection Pump (Governor) (1/2) (Inner Parts)
| DK***00 | Shim? 2.00mm,(High Altitude Spec.) | 0 |
| DK***00 | Gasket | 1 |
| DK***40 | Gasket | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Fuel Injection Pump (Governor) (2/2) (Inner Parts)
| DK***00 | Gasket | 1 |
| DK***40 | Gasket,Air Compressor | 2 |
| DK***00 | Nut,Cap | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Fuel Injection Pump (Pump) (1/2) (Inner Parts)
| 67***70 | Injection Pump Ass'Y | 1 |
| 67***71 | Injection Pump Ass'Y | 1 |
| DK***50 | Pump Ass'Y | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Fuel Injection Pump (Pump) (2/2) (Inner Parts)
| DK***40 | Shim? 0.50mm, Shim, 0.50mm; Was Dk029311-0040 | 0 |
| DK***90 | Shim? 0.25mm, Shim, 0.25mm; Was Dk029311-0590 | 0 |
| DK***00 | Sleeve,Control | 6 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Fuel Injection Pump And Oil Piping
| 07***12 | Gasket,(Without Air Compressor Type) (K2) | 2 |
| 07***10 | Screw, Banjo Connector (M10-1.25x20) | 1 |
| 61***40 | Nipple | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Fuel Injection Pump Mounting And Gear(#26200929-26264836)
| 01***14 | Bolt - Fuel Sensor Mounting | 2 |
| 01***11 | Nut (M14-1.50 Thd), Nut; Was 01582-01411 | 1 |
| 61***61 | Washer, Plain (14mm) | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Fuel Injection Pump Mounting And Gear(#26264837-)
| 01***14 | Bolt - Fuel Sensor Mounting | 2 |
| 01***11 | Nut (M14-1.50 Thd), Nut; Was 01582-01411 | 1 |
| 61***61 | Washer, Plain (14mm) | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Fuel Return(#26231951-)
| 01***45 | Bolt,(Noise Abatement Part) | 2 |
| 04***08 | Clip | 1 |
| 61***80 | Spacer | 2 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Head Cover(#26206782-)
| 67***30 | Bolt (M8x1.25x25) | 6 |
| 67***50 | Washer, Plain (3/8 Inch) | 6 |
| 67***81 | Gasket, Valve Cover | 6 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Heat Shield(#26200929-26257385)
| 01***20 | Bolt,(Forwarded Individually Parts) | 7 |
| 01***25 | Bolt - Relay Mounting | 4 |
| 01***30 | Bolt,(Water Separator Spec.) | 2 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Heat Shield(#26257386-)
| 01***20 | Bolt,(Forwarded Individually Parts) | 7 |
| 01***25 | Bolt - Relay Mounting | 4 |
| 01***30 | Bolt,(Water Separator Spec.) | 2 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Injection Nozzle
| 67***40 | Nozzle | 1 |
| 67***00 | Nozzle Holder Ass'Y | 6 |
| 67***50 | Seal, Rectangular Ring | 6 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Injection Piping(#26231951-)
| 67***80 | Seal, Grommet | 1 |
| 67***60 | Brace, Tube | 1 |
| 67***40 | Screw, Banjo Connector (M6x1.00x14.3) | 6 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Muffler And Mounting
| 01***20 | Bolt,(Forwarded Individually Parts) | 2 |
| 01***25 | Bolt - Relay Mounting | 1 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 8 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Oil Cooler And Oil Filter
| 67***50 | Valve, Pressure Relief | 1 |
| 67***51 | Valve, Pressure Relief | 1 |
| 67***30 | Plug, Pipe (1/8 Nptf) | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Oil Filler
| 01***30 | Bolt, Mounting - Front Hand Rails | 2 |
| 61***20 | Cap Assembly, Oil Fill Tube | 1 |
| 61***80 | Gasket, Oil Fill Cap | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Oil Level Sensor And Oil Gauge
| 01***12 | Bolt,(See Fig. K0210-16a0) | 3 |
| 01***16 | Bolt, Mount Solenoid Valve | 2 |
| 01***35 | Bolt, Cover | 2 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Oil Pan And Suction Tube (Without Drain Plug)(#26222494-)
| 09***50 | Liquid Gasket, Lg-7, 150g | 0 |
| 67***70 | Plate, Clamping | 1 |
| 67***10 | Gasket (K2) | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Oil Pan Bolt(#26204449-)
| 67***60 | Bolt, Mounting (M8-1.25x25) | 3 |
| 67***10 | Bolt, Mounting (M8-1.25 X 25) | 33 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Oil Pressure Switch And Water Temperature Sensor(#26222495-)
| 07***12 | Washer, Gasket,(Without Thermo Sensor) (K1) | 1 |
| 08***05 | Switch,Engine Oil Pressure | 1 |
| 60***61 | Sensor,Water Temperature | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Oil Pump(#26200939-26273427)
| 67***10 | Oil Pump Ass'Y | 1 |
| 67***11 | Pump, Lubricating Oil | 1 |
| 67***20 | Bolt (M8x1.25x30) | 4 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Oil Pump(#26273428-)
| 67***11 | Pump, Lubricating Oil | 1 |
| 67***20 | Bolt (M8x1.25x30) | 4 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Piston
| 67***00 | Piston Ring Ass'Y | 6 |
| 67***10 | Pin, Piston | 6 |
| 67***20 | Ring, Retaining | 12 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Rear Hanger
| 01***30 | Bolt, Mounting - Front Hand Rails | 2 |
| 67***20 | Plate Hanger | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Repair Parts (1/4) (Cylinder Head)
| 67***40 | Gasket, Cylinder Head - 0.5mm Os | 1 |
| 67***70 | Gasket, Cylinder Head - 0.25mm Os | 1 |
| 67***51 | Gasket? 0.50mm,Head | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Repair Parts (2/4) (Cylinder Block)
| 67***10 | Bushing, Oversize (No. 1 Bore) | 1 |
| 67***20 | Bushing, Oversize (No. 2-5 Bore) | 1 |
| 67***10 | Sleeve, Salvage - Std Bore | 6 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Repair Parts (3/4) (Crankshaft)
| 67***00 | Main Metal Ass'Y | 6 |
| 67***00 | Main Metal Ass'Y | 6 |
| 67***00 | Main Metal Ass'Y | 6 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Repair Parts (4/4) (Piston)
| 67***00 | Piston Ring Ass'Y | 6 |
| 67***00 | Piston Ring Ass'Y | 6 |
| 67***20 | Piston? 0.5mm | 6 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Rocker Arm
| 67***70 | Screw, Slotted Set (3/8-24x1 1/2 Inch) | 2 |
| 67***40 | Bolt | 6 |
| 67***10 | Rod, Push | 12 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Safety Relay (Forwarded Individually Parts)(#26269414-)
| 60***30 | Switch,Starter Relay | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Solenoid
| 01***70 | Screw | 1 |
| 01***20 | Bolt,(With Tachometer Outlet) | 2 |
| 01***35 | Screw | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Spare Parts (Ordering Transferred Parts)(#26255445-)
| 07***16 | Gasket,(For Pc750-6) (See Fig.A2110) | 1 |
| 67***81 | Gasket, Valve Cover | 6 |
| 67***10 | Gasket,Camfollower Cover Bolt | 6 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Spare Parts(#26222494-)
| 07***16 | Gasket,(For Pc750-6) (See Fig.A2110) | 1 |
| 67***81 | Gasket, Valve Cover | 6 |
| 67***10 | Gasket,Camfollower Cover Bolt | 6 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Starting Motor (4.5kw) (Inner Parts)(#26200929-26239105)
| 60***10 | Starting Motor Ass'Y,(4.5kw) | 1 |
| ND***82 | Yoke Assembly | 1 |
| ND***00 | Washer, Felt | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Starting Motor (4.5kw) (Inner Parts)(#26239106-)
| 60***10 | Starting Motor Ass'Y,(4.5kw) | 1 |
| ND***82 | Yoke Assembly | 1 |
| ND***00 | Washer, Felt | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Starting Motor (4.5kw)(#26200929-26239105)
| (6***0) | Starting Motor Ass'Y,(4.5kw) (See Fig.A621p-02a2) | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Starting Motor (4.5kw)(#26239106-)
| (6***0) | Starting Motor Ass'Y,(4.5kw) (See Fig.A621p-02a2) | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Starting Motor Mounting (4.5kw)(#26236989-)
| 01***35 | Bolt, Mount Bracket To Floor | 2 |
| 67***11 | Gasket,Starter | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Starting Motor Mounting(#26200929-26246979)
| 67***11 | Gasket,Starter | 1 |
| 67***20 | Bolt, Mounting (M10x1.50x35) | 2 |
| 67***10 | Bolt (M10x1.50x35) | 2 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Tachometer Drive Cover
| 67***90 | Cover, Mechanical Tach Drive | 1 |
| 67***20 | Seal, Rectangular Ring | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Tappet
| 67***12 | Tappet, Valve | 12 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Thermostat
| 67***20 | Thermostat | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Thermostat Housing
| 07***25 | Clip,(For Slag Handling) | 1 |
| 67***40 | Bolt, (M8x1.25x35) | 1 |
| 67***70 | Coupling, Plain Hose | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Turbocharger Mounting(#26200929-26232772)
| 67***10 | Stud ((M10x1.50 (Both Ends) X42)) | 4 |
| 67***20 | Nut (M10x1.50) | 4 |
| 67***30 | Gasket, Turbocharger Mounting | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Turbocharger Mounting(#26232773-)
| 67***10 | Stud ((M10x1.50 (Both Ends) X42)) | 4 |
| 67***20 | Nut (M10x1.50) | 4 |
| 67***31 | Kit,Turbocharger | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Turbocharger Oil Piping(#26200929-26238405)
| 67***80 | Connector, Male | 2 |
| 67***30 | O-Ring,Turbocharger Drain | 2 |
| 67***20 | Gasket | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Turbocharger Oil Piping(#26238406-)
| 07***59 | Clamp - Drain Hose | 2 |
| 62***90 | Gasket,Turbocharger Oil Drain | 1 |
| 67***50 | O-Ring,Turbocharger Drain | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Under Plate
| 67***50 | Plate | 1 |
| 67***51 | Plate, Cylinder Block Stiffener | 1 |
| (0***0) | Liquid Gasket, Lg-7, 150g | 0 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Water Connector (With 35a? 50a? 90a Alternator)(#26222494-)
| 01***05 | Screw | 2 |
| 07***12 | Plug,(For Heater-Less) | 1 |
| 67***30 | Seal,Water Inlet Connection | 1 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Water Connector Elbow(#26222494-)
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Water Connector Plug
| 67***10 | Plug, Pipe (1/2-14 Npt) | 2 |
Komatsu : S6d102e-1x(S/N 26200929-Up) : Engine : Water Pump (Hardening Pulley)
| 67***60 | Bolt (M8x1.25x22) | 2 |
| 67***00 | Water Pump Ass'Y | 1 |
| 67***01 | Water Pump Ass'Y | 1 |
Frequently asked questions
What engine does the Komatsu S6D102E-1X use?
It uses a 5.9-liter, six-cylinder inline diesel engine with mechanical fuel injection, producing approximately 140 horsepower.
What is the operating weight of machines using this engine?
Operating weight varies by configuration and series, typically ranging from 20,000 to 25,000 pounds for the PC200 and PC210 excavator classes.
What replaced the Komatsu S6D102E-1X?
The SAA6D102E-2 engine replaced the S6D102E-1X in later model years to meet stricter emissions standards with electronic control.
What S6D102E-1X(S/N 26200929-UP) owners discuss
What are the known powertrain and hydraulic behaviors for the Komatsu S6D102E-1X engine series?
The S6D102E-1X is a six-cylinder in-line diesel engine with a displacement of 5.9 liters (358.9 cu in) and a bore of 102 mm. It typically delivers 140 hp (133 hp net) at 2000 rpm. The engine is electronically controlled and turbocharged. Community consensus notes that Komatsu hydraulic systems are generally smooth and fuel-efficient, but the line is known for wear patterns where hydraulic pump failure often precedes or coincides with engine degradation. Machines in this series are designed to wear out complete powertrains simultaneously rather than individual components failing in isolation.
What undercarriage or wear patterns are typical for machines using this engine?
Machines equipped with the S6D102E-1X, such as the PC200-6 and PC210-6 excavators, exhibit significant wear on bushings, bearings, and track pads due to heavy loading and environmental exposure. Worn bushings lead to noise and vibration, while degraded bearings can cause premature track failure. The undercarriage tension and roller condition are critical; machines that pull to one side often have mechanical resistance from packed debris or uneven track tension rather than pure hydraulic faults. Final drives on these units are robust but require inspection if grinding noises originate from the travel motors.
What are the common engine quirks per the S6D102E-1X series?
The S6D102E-1X series is noted for strong low-end torque and high fuel efficiency. However, owners report that engine performance issues, such as power loss under load or increased fuel consumption, often stem from airflow restrictions, injector wear, or failing fuel delivery components rather than internal engine failure. The engine relies on a reliable mechanical injection system suitable for tough jobsite conditions, but it requires strict adherence to maintenance intervals to prevent the rapid degradation associated with the broader Komatsu 'Dash 6' generation.
What are the common electrical and sensor issues for this engine?
Komatsu excavators with this engine rely heavily on electronic control systems. Common issues include intermittent starting, dashboard failures, and random shutdowns triggered by a single faulty sensor or unstable power supply. Owners frequently report that multiple warning signals can appear simultaneously due to these electrical instabilities. Diagnostic focus should be on battery state of charge, engine and chassis grounds, and the integrity of the main starter cable and control circuits before assuming component failure.
What should be checked when buying a used machine with the S6D102E-1X engine?
Verify the exact serial-prefix specification sheet and installed attachment package, as configurations affect weight, reach, and fuel use. Check for hydraulic oil condition and temperature behavior; machines that work cold but become weak when hot may have internal pump or valve leakage. Inspect the cooling package (radiator, hydraulic oil cooler, charge-air cooler) for packed debris between heat exchangers. Test travel speed in both forward and reverse to identify side-specific hydraulic or final-drive issues. Ensure the engine does not drop heavily in RPM when hydraulics are engaged, which indicates excessive load or power loss.
What are the critical fluid specifications for the S6D102E-1X engine and associated systems?
Use Komatsu EO or equivalent diesel engine oil for the engine. Use Komatsu TO or equivalent hydraulic oil for the hydraulic system. Use Komatsu AXO or equivalent powertrain oil for the transmission and final drives. Use Komatsu HO or equivalent coolant for the cooling system. Specific capacities vary by configuration; for example, the PC210-6 with this engine has a hydraulic capacity of approximately 108.9 gal/min flow and fuel capacity of 89.9 gal. Always consult the specific machine's operation and maintenance manual for exact volumes.
What is a safety-critical fix related to the S6D102E-1X engine's cooling system?
If the engine overheats during heavy excavation, immediately inspect the radiator, hydraulic oil cooler, and charge-air cooler for packed debris. A machine may look clean externally while material is packed between heat exchangers, reducing cooling capacity. If coolant is repeatedly expelled or the system becomes highly pressurized shortly after a cold start, deeper engine diagnosis may be required. Have your dealer verify the cooling system integrity and pressure test the cap and hoses to prevent catastrophic engine damage from overheating.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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