Komatsu S6D105-1F(S/N 18302-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu S6D105-1F engine (S/N 18302-UP) is a 6-cylinder, turbocharged, direct-injection diesel powerplant used in mid-size Komatsu construction equipment, including the PC200-3, PC220-1, PC220-2, PC220-3, GD500R-2, GD505A-2, GD505R-2, LW160-1, LW200-1, and WA300-1 series. This engine delivers approximately 170 horsepower and 550 lb-ft of torque, fitting into the 100-250 HP class for machines with operating weights ranging from roughly 20,000 to 45,000 lbs depending on the host chassis. Production years for these specific engine applications span the late 1990s through the mid-2000s, serving as the successor to earlier 6D105 variants and preceding the SAA6D107E-1 in later Tier 3/4 models. Configurations offered include mechanical fuel systems and various turbocharger setups tailored for excavators, motor graders, and wheel loaders.
Across the S6D105 series generations, changes primarily involved emissions compliance updates, fuel system refinements from mechanical to electronic control in later sub-variants, and minor turbocharger adjustments for power density. The S6D105-1F remains critical in the used and parts market because it powers a massive volume of legacy Komatsu PC200 and GD500 series machines still in active service. Its widespread use means high demand for reliable rebuild kits, cylinder liners, and fuel injectors, while the mechanical nature of many 1F variants makes it a favorite for independent repair shops seeking cost-effective overhauls compared to newer electronic-heavy engines.
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 S6D105-1F(S/N 18302-UP) specifications
Engine
| Model | S6D105-1F |
| Series/Generation | S6D105 Series |
| Cylinders | 6 |
| Displacement | 6.5 L (396 cu. in.) |
| Aspiration | Turbocharged |
| Fuel System | Direct injection |
| Gross Power | 170 hp (127 kW) @ 2200 min-1 |
| Net Power | 170 hp (127 kW) @ 2200 min-1 |
| Torque | 550 lb-ft (745 N·m) |
| Torque Speed | 1400 min-1 |
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)
| Engine Oil Refill Capacity | 60 L (16 gal) |
| Cooling System Fluid 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 |
| Hydraulic System 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 S6D105-1F(S/N 18302-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 S6D105-1F(S/N 18302-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize Komatsu Oil Wear Analysis (KOWA) at every 500-hour interval to monitor wear metals like iron, copper, and lead in the engine oil. Check coolant pH, SCA concentration, and glycol content every 500 hours to prevent corrosion in the S6D105-1F cooling passages. Monitor hydraulic fluid particle count and water content to protect the main pump and valve block. Track fuel dilution and soot levels in the oil to assess combustion efficiency and filter loading. Use KOMTRAX telematics data to correlate load frequency with oil degradation rates for accurate interval adjustments.
Corrective & Common Repairs
Address frequent S6D105-1F issues by inspecting the turbocharger shaft play and housing for oil leaks during 1,000-hour services. Replace worn fuel injector nozzles if black smoke or hard starting occurs, ensuring proper seat sealing. Check the water pump impeller for erosion if coolant flow drops. Inspect the oil cooler core for external debris blockage that causes overheating. Verify the condition of the crankcase breather to prevent excessive oil consumption. Tighten exhaust manifold bolts to prevent leakage that can damage nearby sensors and hoses.
Overhaul & Rebuild Points
Plan inframe overhauls for the S6D105-1F when compression drops below specification or oil consumption exceeds limits. Replace piston rings, liners, and bearings using early-series rebuild kits for S/N 18302-UP. Inspect the cylinder head for warpage and valve seat integrity during major service. Check the crankshaft journal wear and main bearing clearances. Replace the timing gear set if chain stretch or gear tooth wear is detected. Ensure proper torque sequence for head bolts to maintain cylinder seal integrity during reassembly.
Seasonal & Environment Servicing
In cold climates, verify the coolant freeze protection level before winter to prevent block cracking. Use lower viscosity diesel engine oil (e.g., SAE 5W-30) for cold starts to ensure proper lubrication. In hot environments, clean radiator and oil cooler fins frequently to maintain heat rejection. Check the thermostat operation to ensure it opens fully and prevents overheating under heavy load. Inspect air intake hoses for cracks that could allow dust ingestion in dry conditions. Verify the fuel water separator drains properly to prevent ice formation in fuel lines during winter.
S6D105-1F(S/N 18302-UP) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 600-311-9100 | Fuel Filter Ass'Y | Fuel system service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
S6D105-1F(S/N 18302-UP) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| CA115 | Engine crankshaft speed sensor failure | Faulty speed sensor, broken wiring harness, or corroded connector at the pin connector | Replace the speed sensor and verify voltage at the pin connector |
| CA111 | Internal engine controller fault | Critical internal failure of the Electronic Control Module (ECM) | Replace or reprogram the ECM |
| CA451 | Common rail pressure sensor feedback value too high | Malfunction in the rail pressure sensor or actual overpressure condition in the fuel system | Diagnose the fuel rail pressure sensor and check pump lines |
| CA234 | Engine overspeed | Incorrect throttle calibration, engine load cycle issues, or operator misuse | Verify throttle calibration and engine load cycle |
| CA441 | Battery voltage too low | Weak battery, failing alternator, or voltage regulator issue | Replace the alternator or battery; check the voltage regulator |
| CA442 | Battery voltage too high | Failing alternator or voltage regulator causing overcharging | Replace the alternator or battery; check the voltage regulator |
| 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 circuit or airflow restriction | Check for a sensor short or an airflow restriction |
| CA153 | Intake air temperature sensor feedback voltage too high | Faulty Intake Air Temperature (IAT) sensor | Replace or test the IAT sensor |
| CA154 | Intake air temperature sensor feedback voltage too low | Faulty Intake Air Temperature (IAT) sensor or short circuit | 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.
S6D105-1F(S/N 18302-UP) attachments & work tools
Crawler Excavator Attachments
The S6D105-1F engine powers the PC200-3 and PC200LC-3 excavator series, as documented in the Komatsu 6D105 Series Diesel Engine Shop Manual (SEBE61360109). Typical bucket capacities for this class range from 0.8 to 1.2 cubic meters, varying by configuration/series. These machines utilize a standard quick coupler system for bucket interchangeability. Hydraulic kit arrangements are integrated into the main boom and arm structure, requiring specific flow rates for high-digging-force configurations.
Motor Grader Attachments
The S6D105-1 engine is specified for the GD500R-2, GD505A-2, GD505R-2, GD521A-1, GD523A-1, and GD525A-1 motor grader models per the factory service manual. Blade widths for this class typically range from 3.0 to 3.7 meters. The mounting system uses a rigid frame with a central pivot point for the moldboard. Factory guarding options include heavy-duty side cutters and adjustable angle blades for specific grading configurations.
Wheel Loader Attachments
The S6D105-1 engine is listed for the WA300-1 and WA320-1 wheel loaders in the Komatsu 6D105 Series Diesel Engine Shop Manual. Bucket capacities for these models generally range from 2.0 to 3.0 cubic meters. The attachment interface uses a standard pin-on coupler system for bucket and grapple interchange. Hydraulic arrangements support high-lift and high-breakout-force configurations typical of the 20-ton class.
Wheeled Excavator Attachments
The S6D105-1E engine variant is specified for the W90-2 and W90-3 wheeled excavators per the Komatsu 6D105 Series Diesel Engine Shop Manual. Bucket capacities for this smaller class typically range from 0.3 to 0.5 cubic meters. The mounting system utilizes a standard quick-attach coupler for rapid tool changes. Hydraulic kit notes indicate a focus on travel and swing power distribution suitable for wheeled chassis stability.
Engine Fluid Specifications
Komatsu Genuine Diesel Engine Oil (TO series) is recommended for the S6D105-1F engine, meeting Komatsu Engineering Standards. Super-coolant AF-NAC is specified for the cooling system to prevent corrosion and scaling. Hydraulic oil specifications include HO56 or equivalent ISO VG46 hydraulic fluid for the machine's hydraulic system. Axle oil requirements specify AXO80 or equivalent SAE 80WZF API GL-4.
All S6D105-1F(S/N 18302-UP) assemblies by section
Every catalogued assembly group for the Komatsu S6D105-1F(S/N 18302-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Accessory
Komatsu : S6d105-1f(S/N 18302-Up) : Accessory : Air Compressor
| 61***11 | Air Compressor Ass'Y,(See Fig.621) | 1 |
| 61***12 | Air Compressor Ass'Y | 1 |
| DK***00 | Cylinder | 1 |
Komatsu : S6d105-1f(S/N 18302-Up) : Accessory : Air Compressor And Piping
| 04***16 | Key, Lever Mounting | 1 |
| 07***12 | Gasket,(Without Air Compressor Type) (K2) | 4 |
| 07***16 | Gasket,Air Compressor Piping | 1 |
Cooling And Electrical Systems
Komatsu : S6d105-1f(S/N 18302-Up) : Cooling And Electrical Systems : Alternator (25a)(#18302-76825)
| 60***51 | Alternator A. (25a) | 1 |
| KD***30 | Holder,Brush | 1 |
| KD***60 | Pulley | 1 |
Komatsu : S6d105-1f(S/N 18302-Up) : Cooling And Electrical Systems : Alternator (25a)(#76826-)
| 60***30 | Alternator A. (25a),(With Non Hardening Pulley) | 1 |
| KD***57 | Bearing,Ball? Front | 1 |
| KD***70 | Bracket,Front | 1 |
Komatsu : S6d105-1f(S/N 18302-Up) : Cooling And Electrical Systems : Alternator And Mounting
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***30 | Bolt | 1 |
| 01***30 | Bolt,(For Trimming Dozer) | 1 |
Komatsu : S6d105-1f(S/N 18302-Up) : Cooling And Electrical Systems : Corrosion Resistor
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 5 |
| 01***30 | Bolt,(For France Noise Suppression) | 1 |
| 01***29 | Washer,Spring (Cold Weather Spec.) | 4 |
Komatsu : S6d105-1f(S/N 18302-Up) : Cooling And Electrical Systems : Heater Signal And Regulator
| 60***70 | Switch,Air Intake Heater | 1 |
| 60***60 | Switch,Heater Relay | 1 |
| 60***70 | Signal,Heater | 1 |
Komatsu : S6d105-1f(S/N 18302-Up) : Cooling And Electrical Systems : Starting Motor (1/2) (5.5kw) (Tropical Sandy? Dusty Spec.)(#18302-81469)
| 60***51 | Starting Motor Ass'Y,(5.5kw) | 1 |
| KD***10 | Clutch Ass'Y,Over Running | 1 |
| KD***01 | O-Ring | 1 |
Komatsu : S6d105-1f(S/N 18302-Up) : Cooling And Electrical Systems : Starting Motor (1/2) (5.5kw)(#18302-81469)
| 60***43 | Starting Motor A.,(5.5kw) (See Fig.0661) | 1 |
| KD***10 | Clutch Ass'Y,Over Running | 1 |
| KD***01 | O-Ring | 1 |
Komatsu : S6d105-1f(S/N 18302-Up) : Cooling And Electrical Systems : Starting Motor (1/2) (5.5kw)(#81470-)
| 60***80 | Starting Motor Ass'Y,(5.5kw) | 1 |
| KD***30 | Bracket,Center | 1 |
| KD***50 | O-Ring | 1 |
Komatsu : S6d105-1f(S/N 18302-Up) : Cooling And Electrical Systems : Starting Motor (2/2) (5.5kw) (Tropical Sandy? Dusty Spec.)(#18302-81469)
| KD***01 | Washer,Seal | 2 |
| KD***80 | Shift Lever Ass'Y | 1 |
| KD***30 | Contactor,Moving | 1 |
Komatsu : S6d105-1f(S/N 18302-Up) : Cooling And Electrical Systems : Starting Motor (2/2) (5.5kw)(#18302-81469)
| KD***01 | Washer,Seal | 2 |
| KD***80 | Shift Lever Ass'Y | 1 |
| KD***30 | Contactor,Moving | 1 |
Komatsu : S6d105-1f(S/N 18302-Up) : Cooling And Electrical Systems : Starting Motor (2/2) (5.5kw)(#81470-)
| KD***50 | O-Ring | 1 |
| KD***30 | Cap, Gum | 1 |
| KD***10 | Ring,Clip | 2 |
Komatsu : S6d105-1f(S/N 18302-Up) : Cooling And Electrical Systems : Starting Motor And Mounting
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 3 |
| 01***36 | Washer,Radio Controlled Slag Handling | 3 |
| 07***00 | O-Ring,(F4350-65a1 -5 ) | 1 |
Komatsu : S6d105-1f(S/N 18302-Up) : Cooling And Electrical Systems : Water Pump And Cooling Fan
| 01***16 | Bolt,(For Slag Handling) | 2 |
| 01***30 | Bolt,(Cold Terrain Spec.) | 3 |
| 01***30 | Bolt,(For France Noise Suppression) | 6 |
Cylinder Block
Komatsu : S6d105-1f(S/N 18302-Up) : Cylinder Block : Camshaft And Tappet
| 01***25 | Bolt,(Without Auto Priming System) | 2 |
| 01***25 | Washer,Spring?(Sandy And Dusty Spec.) | 2 |
| 01***16 | Washer,(For Shipping) | 2 |
Komatsu : S6d105-1f(S/N 18302-Up) : Cylinder Block : Crankshaft
| 01***25 | Bolt - Rear Guard Mounting | 6 |
| 01***36 | Washer,Radio Controlled Slag Handling | 6 |
| 61***11 | Bolt,Nylock (K2) | 1 |
Komatsu : S6d105-1f(S/N 18302-Up) : Cylinder Block : Cylinder Block(#18302-49999)
| 01***30 | Bolt,(For France Noise Suppression) | 4 |
| 01***75 | Bolt,(For 75a Alternator) | 1 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 4 |
Komatsu : S6d105-1f(S/N 18302-Up) : Cylinder Block : Cylinder Block(#50001-)
| 01***30 | Bolt,(For France Noise Suppression) | 4 |
| 01***75 | Bolt,(For 75a Alternator) | 1 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 4 |
Komatsu : S6d105-1f(S/N 18302-Up) : Cylinder Block : Flywheel And Flywheel Housing
| 01***40 | Bolt,(Dust And Dirt Protection) | 9 |
| 01***60 | Bolt, Trunnion Cap | 2 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 8 |
Komatsu : S6d105-1f(S/N 18302-Up) : Cylinder Block : Front Cover
| 01***22 | Bolt,(Cold Terrain Spec.) | 4 |
| 01***25 | Bolt,(Without Auto Priming System) | 4 |
| 01***60 | Bolt,(Without Alternator Bracket) | 8 |
Komatsu : S6d105-1f(S/N 18302-Up) : Cylinder Block : Oil Pan
| 01***22 | Bolt,(Cold Terrain Spec.) | 29 |
| 01***25 | Bolt,(Without Auto Priming System) | 8 |
| 01***30 | Bolt,(Cold Terrain Spec.) | 1 |
Komatsu : S6d105-1f(S/N 18302-Up) : Cylinder Block : Piston And Connecting Rod
| 04***18 | Ring, Retaining | 2 |
| 61***40 | Crank Pin Metal A | 6 |
| 61***00 | Connecting Rod Ass'Y | 6 |
Cylinder Head
Komatsu : S6d105-1f(S/N 18302-Up) : Cylinder Head : Air Cleaner
| 01***08 | Nut,R.H. Thread | 8 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 8 |
| 01***16 | Washer,Radio Controlled Slag Handling | 8 |
Komatsu : S6d105-1f(S/N 18302-Up) : Cylinder Head : Air Cleaner Oil Bath Type And Pre-Cleaner(#60844-)
| 01***35 | Bolt,(Not Shown) | 1 |
| 01***70 | Nut,Wing | 1 |
| 01***08 | Nut,R.H. Thread | 1 |
Komatsu : S6d105-1f(S/N 18302-Up) : Cylinder Head : Air Intake Manifold And Connection(#18302-18810)
| 01***20 | Bolt | 2 |
| 01***50 | Bolt,(For Trimming Dozer) | 2 |
| 01***65 | Bolt,(For Alternator Bracket Mount) | 10 |
Komatsu : S6d105-1f(S/N 18302-Up) : Cylinder Head : Air Intake Manifold And Connection(#18811-)
| 01***20 | Bolt | 2 |
| 01***50 | Bolt,(For Trimming Dozer) | 2 |
| 01***65 | Bolt,(For Alternator Bracket Mount) | 10 |
Komatsu : S6d105-1f(S/N 18302-Up) : Cylinder Head : Cylinder Head Cover(#18302-49999)
| 01***25 | Washer,Spring?(Sandy And Dusty Spec.) | 2 |
| 02***22 | Bolt | 3 |
| 02***22 | Bolt | 3 |
Komatsu : S6d105-1f(S/N 18302-Up) : Cylinder Head : Cylinder Head Cover(#50001-)
| 01***25 | Washer,Spring?(Sandy And Dusty Spec.) | 2 |
| 02***22 | Bolt | 3 |
| 02***22 | Bolt | 2 |
Komatsu : S6d105-1f(S/N 18302-Up) : Cylinder Head : Cylinder Head(#10001-)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 2 |
| 07***08 | Plug,(Without Oil Pressure Switch) | 7 |
Komatsu : S6d105-1f(S/N 18302-Up) : Cylinder Head : Exhaust Manifold And Turbocharger
| 01***00 | Bolt (M10-1.50x100) | 12 |
| 01***05 | Bolt (M10-1.50x105) | 12 |
| 01***32 | Washer,(With Auto Emergency Steering) | 13 |
Komatsu : S6d105-1f(S/N 18302-Up) : Cylinder Head : Muffler
| 01***40 | Bolt, Mount Retainer | 4 |
| 01***50 | Bolt | 4 |
| 01***08 | Nut | 8 |
Komatsu : S6d105-1f(S/N 18302-Up) : Cylinder Head : Rocker Arm
| 01***80 | Bolt,(Shim 5 Pieces Over) | 2 |
| 01***06 | Nut, Regular Hexagon (M8-1.25) | 12 |
| 01***36 | Washer,Radio Controlled Slag Handling | 6 |
Komatsu : S6d105-1f(S/N 18302-Up) : Cylinder Head : Turbocharger (Except Japan)
| 61***01 | Turbocharger Ass'Y | 1 |
| 61***00 | Turbocharger Ass'Y,(T04b-59) | 1 |
| GA***04 | Rotor Ass'Y | 1 |
Engine Kit
Komatsu : S6d105-1f(S/N 18302-Up) : Engine Kit : Gasket Kit
| 07***70 | O-Ring,(For Intake Air Cover) | 1 |
| 07***00 | O-Ring,(F4350-65a1 -5 ) | 1 |
| 07***45 | O-Ring,(F4320-61a0 -16 ), O-Ring; Was 07000-02145 | 1 |
Fuel System
Komatsu : S6d105-1f(S/N 18302-Up) : Fuel System : Additional Fuel Filter
| 07***12 | Gasket,Mechanical Pump Piping | 2 |
| 60***00 | Fuel Filter Ass'Y | 1 |
| 60***20 | Cartridge,Pref | 1 |
Komatsu : S6d105-1f(S/N 18302-Up) : Fuel System : Fuel Filter(#18302-49999)
| 01***35 | Bolt, Mounting - Flywheel Housing End | 2 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 2 |
| 01***16 | Washer,Radio Controlled Slag Handling | 2 |
Komatsu : S6d105-1f(S/N 18302-Up) : Fuel System : Fuel Filter(#50001-)
| 01***35 | Bolt, Mounting - Flywheel Housing End | 2 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 2 |
| 01***16 | Washer,Radio Controlled Slag Handling | 2 |
Komatsu : S6d105-1f(S/N 18302-Up) : Fuel System : Fuel Injection Pump (Coupling)(#18302-49999)
| DK***00 | Bolt | 6 |
| DK***00 | Bolt | 1 |
| DK***30 | Coupling Ass'Y | 1 |
Komatsu : S6d105-1f(S/N 18302-Up) : Fuel System : Fuel Injection Pump (Coupling)(#50001-)
| DK***70 | Coupling Ass'Y | 1 |
| DK***00 | Bolt | 1 |
| DK***00 | Nut | 2 |
Komatsu : S6d105-1f(S/N 18302-Up) : Fuel System : Fuel Injection Pump (Feed Pump)
| DK***20 | Bolt, Joint | 1 |
| DK***20 | Pump,Priming | 1 |
| DK***00 | Spring,Piston | 1 |
Komatsu : S6d105-1f(S/N 18302-Up) : Fuel System : Fuel Injection Pump (Governor) (1/2)(#18302-49999)
| DK***40 | Gasket,Air Compressor | 2 |
| DK***20 | Capsule,Spring | 1 |
| DK***00 | Nut,Cap | 1 |
Komatsu : S6d105-1f(S/N 18302-Up) : Fuel System : Fuel Injection Pump (Governor) (1/2)(#50001-)
| DK***40 | Gasket,Air Compressor | 2 |
| DK***00 | Nut,Cap | 1 |
| DK***40 | Bolt | 2 |
Komatsu : S6d105-1f(S/N 18302-Up) : Fuel System : Fuel Injection Pump (Governor) (2/2)(#18302-49999)
| DK***00 | Adapter | 1 |
| DK***80 | Nut | 1 |
| DK***00 | Spring | 1 |
Komatsu : S6d105-1f(S/N 18302-Up) : Fuel System : Fuel Injection Pump (Governor) (2/2)(#50001-)
| DK***00 | Adapter | 1 |
| DK***80 | Nut | 1 |
| DK***00 | Nut,Lock | 1 |
Komatsu : S6d105-1f(S/N 18302-Up) : Fuel System : Fuel Injection Pump (Pump)(#18302-49999)
| 61***00 | Injection Pump Ass'Y | 1 |
| DK***10 | Washer,Spring | 1 |
| DK***00 | Shim Ass'Y | 2 |
Komatsu : S6d105-1f(S/N 18302-Up) : Fuel System : Fuel Injection Pump (Pump)(#50001-)
| 61***00 | Injection Pump Ass'Y | 1 |
| DK***10 | Washer,Spring | 1 |
| DK***00 | Shim Ass'Y | 2 |
Komatsu : S6d105-1f(S/N 18302-Up) : Fuel System : Fuel Injection Pump And Piping
| 01***70 | Bolt | 4 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 4 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
Komatsu : S6d105-1f(S/N 18302-Up) : Fuel System : Nozzle Holder
| 01***55 | Bolt,(For Trimming Dozer) | 12 |
| 01***25 | Washer,Spring?(Sandy And Dusty Spec.) | 12 |
| 07***12 | Gasket,Mechanical Pump Piping | 2 |
Komatsu : S6d105-1f(S/N 18302-Up) : Fuel System : Water Separator
| 07***60 | O-Ring,(For Pc750?800?1800) (A2610) | 1 |
| 60***60 | Plug,Drain (4d105-5h? 4d105-5t) | 1 |
| 60***00 | Water Separator A.,(See Fig.2415) | 1 |
Lubricating Oil System
Komatsu : S6d105-1f(S/N 18302-Up) : Lubricating Oil System : Lubricating Oil Cooler(#18302-49999)
| 01***25 | Bolt,(Without Auto Priming System) | 5 |
| 01***30 | Bolt,(Cold Terrain Spec.) | 3 |
| 01***35 | Bolt,(Without Auto Priming System) | 16 |
Komatsu : S6d105-1f(S/N 18302-Up) : Lubricating Oil System : Lubricating Oil Cooler(#50001-)
| 01***25 | Bolt,(Without Auto Priming System) | 5 |
| 01***30 | Bolt,(Cold Terrain Spec.) | 3 |
| 01***35 | Bolt,(Without Auto Priming System) | 16 |
Komatsu : S6d105-1f(S/N 18302-Up) : Lubricating Oil System : Lubricating Oil Filter
| 01***85 | Bolt | 1 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 2 |
| 01***25 | Washer,Spring?(Sandy And Dusty Spec.) | 1 |
Komatsu : S6d105-1f(S/N 18302-Up) : Lubricating Oil System : Lubricating Oil Pump And Suction Pipe(#18302-49999)
| 01***25 | Bolt,(Without Auto Priming System) | 3 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***50 | Bolt (Kit) | 4 |
Komatsu : S6d105-1f(S/N 18302-Up) : Lubricating Oil System : Lubricating Oil Pump And Suction Pipe(#50001-)
| 01***25 | Bolt,(Without Auto Priming System) | 3 |
| 01***30 | Bolt,(Cold Terrain Spec.) | 1 |
| 01***45 | Bolt,(S6d155-4b) | 1 |
Komatsu : S6d105-1f(S/N 18302-Up) : Lubricating Oil System : Turbocharger Lubricating Oil Piping
| 01***22 | Bolt,(Cold Terrain Spec.) | 2 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 2 |
S6D105-1F(S/N 18302-UP) serial number reference
The engine serial number plate is located on the left side of the engine block, typically near the injection pump or on a metal plate affixed to the valve cover. The prefix is the first three characters of the engine model code stamped on this plate, which identifies the engine family and generation rather than the machine chassis PIN.
| Prefix | Identifies | Notes |
|---|---|---|
| S6D105-1F | Engine Model | Identifies the specific engine configuration for the S/N 18302-UP range. Per the Komatsu S6D105-1F Parts Catalog, this engine model is explicitly tied to the serial number range 18302-UP. No other 3-character PIN prefixes are documented for this specific engine serial range in the provided sources. |
Frequently asked questions
What engine does the Komatsu S6D105-1F use?
The Komatsu S6D105-1F is a 6-cylinder, turbocharged, direct-injection diesel engine delivering approximately 170 horsepower and 550 lb-ft of torque. It features a mechanical fuel system in many configurations and is used in PC200-3, PC220 series excavators, GD500 series motor graders, and WA300 wheel loaders.
What is the operating weight of machines using this engine?
Operating weight varies by configuration and series. Machines equipped with the S6D105-1F, such as the PC200-3 and GD500R-2, typically fall in the 20,000 to 45,000 lb range. Exact weights depend on the specific chassis, attachment package, counterweight, and regional emissions configuration.
What replaced the Komatsu S6D105-1F engine?
The S6D105-1F was largely replaced by the Komatsu SAA6D107E-1 engine in later PC200 and GD500 series models to meet stricter Tier 3 and Tier 4 emissions standards. The SAA6D107E-1 features electronic fuel injection and advanced aftertreatment systems compared to the mechanical system of the S6D105-1F.
What S6D105-1F(S/N 18302-UP) owners discuss
What are the known powertrain and hydraulic behaviors for the Komatsu S6D105-1F engine series?
What undercarriage or wear patterns are typical for machines powered by this engine series?
What are the specific engine quirks per the S6D105-1F series?
What are the common electrical or sensor issues associated with this engine?
What should be checked when buying a used machine with the S6D105-1F engine (S/N 18302-UP)?
What are the fluid specifications for the S6D105-1F engine?
What safety-critical fixes are associated with the S6D105-1F engine?
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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