Komatsuengine(no series)
Komatsu S6D140-1W(S/N 17626-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu S6D140-1W engine powers mid-to-heavy class construction machinery, including WA320-8 wheel loaders and PC300-class excavators, with operating weights ranging from 34,000 to 80,000 lb. Produced from 2017 onward, this six-cylinder diesel unit replaced earlier 6D102 series engines in specific heavy-duty applications. Configurations vary by machine model, with power outputs typically between 165 and 271 hp. The S6D140-1W is part of the S6D140 series lineage, succeeding the 6D140-1 in newer Tier 4 compliant platforms.
Across generations, the S6D140-1W evolved to meet stricter emissions standards, incorporating advanced fuel injection and turbocharging technologies. The machine remains significant in the used and parts market due to its widespread use in durable Komatsu excavators and wheel loaders. Its mechanical robustness and availability of overhaul kits make it a staple for fleet maintenance, with serial number S/N 17626-UP indicating later production units with updated component specifications.
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 S6D140-1W(S/N 17626-UP) specifications
Engine
| Model | S6D140-1W (S/N 17626-UP) |
| Series | 6D140-1 Series |
| Displacement | 15.2 L (927.5 cu in) |
| Cylinders | 6 |
| Bore | 140 mm (5.51 in) |
| Emissions Tier | Not documented for this exact serial range — verify with your dealer |
| Gross/Net Power | 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 Speeds | 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 S6D140-1W(S/N 17626-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 S6D140-1W(S/N 17626-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
Run scheduled KOWA oil sampling on the S6D140-1W to monitor wear metals and soot loading. Track coolant SCA concentration closely to prevent internal passage pitting. Use KOMTRAX telematics to monitor fuel consumption and load frequency. Analyze hydraulic oil samples for particle count and viscosity changes. Early detection of iron or copper trends helps predict injection pump or turbocharger bearing wear before failure occurs.
Corrective & Common Repairs
Common repairs on the S6D140-1W include replacing worn fuel filters and hydraulic return filters. Address turbocharger seal seepage and cracked air intake ducting from thermal cycling. Inspect and replace worn belts and hoses during major services. Fix intermittent starting issues by checking electrical connections and sensors. Replace worn undercarriage components like track rollers and sprockets to maintain machine stability and reduce drivetrain stress.
Overhaul & Rebuild Points
Plan inframe overhauls for the S6D140-1W around 10,000 to 15,000 hours depending on service history. Replace cylinder liners, pistons, and rings during out-of-frame rebuild s. Inspect the crankshaft and camshaft for wear. Replace all gaskets and seals. Verify valve adjustments and fuel injection pump calibration. Use genuine Komatsu overhaul kits to ensure proper fit and performance restoration for the six-cylinder engine block.
Seasonal & Environment Servicing
In cold climates, verify that the intake air heater or ether-assist starting aid is functional before winter. Switch to arctic-grade engine oil and fuel to ensure proper flow. Confirm coolant concentration protects against rated temperature. In dusty environments, inspect the air filter more frequently and clean the radiator fins daily. Monitor hydraulic fluid levels closely in extreme heat to prevent overheating and maintain optimal system pressure.
S6D140-1W(S/N 17626-UP) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 07281-00197 | Clamp,(With Pre-Fuel Filter) | Fuel system service | Check fitment → |
| 600-311-7131 | Cartridge,Fuel Filter | Fuel system service | Check fitment → |
| 600-311-7132 | Cartridge,Fuel Filter | Fuel system service | Check fitment → |
| 6210-71-6201 | Fuel Filter Ass'Y | Fuel system service | Check fitment → |
| 6210-71-6202 | 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.
S6D140-1W(S/N 17626-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 |
| CA111 | Internal engine controller fault | ECM hardware or software failure | Replace or reprogram the ECM |
| CA122 | Intake air pressure sensor feedback voltage too high | Sensor malfunction 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 |
| CA451 | Common rail pressure sensor feedback value too high | Fuel rail pressure sensor malfunction or actual overpressure | Diagnose the fuel rail pressure sensor or pump lines |
| CA452 | Common rail pressure sensor feedback value too low | Fuel rail pressure sensor malfunction or low pressure condition | Diagnose the fuel rail pressure sensor or pump lines |
| CA234 | Engine overspeed | Throttle calibration error, engine load cycle issue, or operator misuse | Verify throttle calibration, engine load cycle, or operator misuse |
| CA441 | Battery voltage too low | Alternator failure, battery failure, or voltage regulator issue | Replace the alternator or battery; check the voltage regulator |
| CA442 | Battery voltage too high | Alternator failure or voltage regulator issue | Replace the alternator or battery; check the voltage regulator |
| CA153 | Intake air temperature sensor feedback voltage too high | Sensor malfunction or wiring issue | 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.
S6D140-1W(S/N 17626-UP) attachments & work tools
Wheel Loader Attachments
The S6D140-1 engine powers the WA500-1L wheel loader, which utilizes standard loader bucket configurations for earthmoving and material handling. Factory specifications for this class typically include bucket capacities ranging from 3.0 to 4.5 cubic meters (3.9 to 5.9 cubic yards) depending on the specific bucket profile and material density. Coupler systems are integrated into the loader arm structure, allowing for quick tool changes between buckets and auxiliary attachments like pallet forks or grapples.
Bulldozer Attachments
This engine is installed in the D155A-2, D155A-3, and D155AX-3 dozer series, which are equipped with semi-U or universal dozer blades for heavy push applications. Blade capacities for these models generally range from 18 to 22 cubic meters (23 to 29 cubic yards), with height and width dimensions scaled to the machine's operating weight. The mounting system uses a rigid frame connection with hydraulic cylinders for angle and tilt control, often featuring side-cutters or wing extensions for trenching operations.
Mining Dozer Attachments
The D275A-5 dozer, powered by variants of the 6D140 series, utilizes a heavy-duty semi-U blade designed for high-production mining and large-scale earthmoving. Blade capacities for this class often exceed 25 cubic meters (33 cubic yards), with reinforced cutting edges and side plates to withstand abrasive materials. Guarding options include heavy-duty top guards and side skirts to protect the engine compartment and hydraulic lines from falling debris and rock impact.
Hydraulic System Configurations
Work tools on WA500 and D155 series machines require specific hydraulic flow and pressure ratings to operate auxiliary functions such as blade angle control or loader arm lift. Hydraulic kits are configured to match the engine's PTO or accessory drive output, ensuring adequate flow for high-demand attachments like hydraulic breakers or mulchers. Factory configurations include pressure compensators and flow dividers to maintain tool performance under varying load conditions.
Engine Guarding and Protection
Factory options for the S6D140-1 equipped machines include heavy-duty grilles, rock guards, and underbody protection plates to shield the engine and cooling components. These guarding systems are designed to prevent damage from flying debris, rocks, and material spillage in mining and quarry environments. Additional options may include cold-weather starting aids, intake air heaters, and ether-assist systems for operation in extreme temperatures.
All S6D140-1W(S/N 17626-UP) assemblies by section
Every catalogued assembly group for the Komatsu S6D140-1W(S/N 17626-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Engine
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Air Cleaner
| 01***40 | Bolt,(Dust And Dirt Protection) | 2 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 3 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 5 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Air Compressor (Inner Parts)
| 62***11 | Air Compressor Ass'Y | 1 |
| 62***12 | Air Compressor Ass'Y | 1 |
| DK***00 | Flange | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Air Compressor Gasket Kit
| 07***25 | O-Ring,Corrosion Resistor | 1 |
| 07***23 | O-Ring,(For Shipping) (K6) | 1 |
| 07***34 | O-Ring,(F2320-62a0 -7 ) | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Air Compressor Mounting
| 01***00 | Bolt, Mount Back-Up Alarm | 3 |
| 01***30 | Bolt | 4 |
| 01***12 | Nut | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Air Compressor Relif Valve
| 01***35 | Bolt,(For Position Fixing) | 1 |
| 01***45 | Bolt,(For Power Tilt Mech Angle) | 1 |
| 01***55 | Bolt, Mount Tube To Switch Pump | 2 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Air Intake Manifold
| 01***75 | Bolt,(For Adjusting) | 12 |
| 01***35 | Bolt | 9 |
| 01***75 | Screw | 5 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Air Vent(#17626-19971)
| 01***20 | Bolt | 1 |
| 01***16 | Washer,Radio Controlled Slag Handling | 1 |
| 07***15 | Gasket,(Hd325?Pc750?800?1800) (A5010) | 6 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Air Vent(#19972-)
| 01***20 | Bolt | 1 |
| 01***16 | Washer,Radio Controlled Slag Handling | 1 |
| 07***15 | Gasket,(Hd325?Pc750?800?1800) (A5010) | 13 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Alternator (50a) (With Hardening Pulley) (Inner Parts)
| 60***21 | Alternator A. (50a),(With Hardening Pulley) | 1 |
| SD***X0 | Coil Assembly | 1 |
| SD***X0 | Washer | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Alternator (50a) (With Non Hardeninp Pulley) (Inner Parts)
| 60***71 | Alternator A. (50a),(With Non Hardening Pulley) | 1 |
| SD***X0 | Coil Assembly | 1 |
| SD***X0 | Washer | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Alternator Mounting (50a) (Alternator With Hardening Pulley)
| 01***20 | Bolt,(With Auto Emergency Steering) | 3 |
| 01***00 | Bolt | 1 |
| 01***30 | Bolt | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Alternator Mounting (50a) (Alternator With Non Hardening Pulley)
| 01***20 | Bolt,(With Auto Emergency Steering) | 3 |
| 01***00 | Bolt | 1 |
| 01***30 | Bolt | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Cam Follower Cover
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 5 |
| 01***65 | Bolt,(Except Japan) | 1 |
| 01***70 | Bolt, Mount Bracket And Oil Inlet Tube, Bolt | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Camshaft And Cam Follower(#17626-19971)
| 04***25 | Key, Plain Woodruff | 1 |
| 04***12 | Ring, Retaining | 4 |
| 61***20 | Ball | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Camshaft And Cam Follower(#19972-)
| 04***25 | Key, Plain Woodruff | 1 |
| 04***12 | Ring, Retaining | 4 |
| 61***20 | Ball | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Cooling Fan
| 01***90 | Bolt, Fan Mounting | 6 |
| 60***01 | Fan,Cooling | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Corrosion Resistor
| 01***16 | Bolt,(Sandy And Dusty Spec.) | 1 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 3 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Crank Pulley (Hardening Pulley)
| 04***24 | Pin,Dowel (For No.3 Housing) | 1 |
| 62***20 | Bolt | 6 |
| 62***80 | Pulley? Hardening | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Crank Pulley (Non Hardening Pulley)
| 04***24 | Pin,Dowel (For No.3 Housing) | 1 |
| 62***20 | Bolt | 6 |
| 62***70 | Pulley?Non Hardening | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Crankshaft
| 61***30 | Key Parallel | 1 |
| 62***00 | Bearing Assembly | 1 |
| 62***10 | Main Bearing Assembly | 7 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Cylinder Block (1/2)
| 01***45 | Washer,(Without R.O.P.S.) | 14 |
| 04***14 | Pin, Dowel | 2 |
| 04***20 | Pin,Dowel (Welded) | 12 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Cylinder Block (2/2)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 7 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 2 |
| 01***25 | Screw | 6 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Cylinder Block Gasket Kit
| 02***37 | O-Ring,(For Pc750?1800) (A5010) | 2 |
| 07***06 | O-Ring,Corrosion Resistor | 1 |
| 07***14 | O-Ring,(F4350-63a1a-2 ) | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Cylinder Head Gasket Kit(#17626-19971)
| 02***75 | O-Ring,(For Japan) (K1) | 4 |
| 02***81 | O-Ring,Air Connector | 2 |
| 07***21 | O-Ring,Oil Cooler Pipe | 12 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Cylinder Head Gasket Kit(#19972-)
| 02***75 | O-Ring,(For Japan) (K1) | 4 |
| 02***81 | O-Ring,Air Connector | 2 |
| 07***21 | O-Ring,Oil Cooler Pipe | 12 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Cylinder Head(#17626-19971)
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 1 |
| 02***04 | Plug, Pipe | 6 |
| 04***20 | Pin,Dowel (Welded) | 2 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Cylinder Head(#19972-)
| 01***20 | Bolt (M10-1.75x120) | 6 |
| 02***04 | Plug, Pipe | 6 |
| 04***20 | Pin,Dowel (Welded) | 2 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Damper
| 01***30 | Bolt,(Not Used With Emergency Str.) | 6 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 6 |
| 62***01 | Damper Ass'Y | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Ejector
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***75 | Bolt,(For D57sr) | 1 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Engine Mounting
| 01***50 | Bolt,(For Tbg/Abe Spec.) | 4 |
| 01***75 | Bolt | 4 |
| 01***45 | Washer,(For Travel Motor) (Not Show) | 8 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Engine Stop Motor
| 01***16 | Bolt (Welded) | 3 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 4 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Exhaust Manifold(#17626-20038)
| 01***55 | Screw | 2 |
| 01***00 | Bolt | 22 |
| 61***90 | Nut, Mounting | 2 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Exhaust Manifold(#20039-20659)
| 01***55 | Screw | 2 |
| 01***00 | Bolt | 22 |
| 61***90 | Nut, Mounting | 2 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Exhaust Manifold(#20660-)
| 01***55 | Screw | 2 |
| 01***00 | Bolt | 22 |
| 61***20 | Spacer,(For Shipping) | 22 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Fan Drive (With Hardening Pulley)(#17626-21281)
| 01***12 | Bolt,(With Cylinder Cover) | 6 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***45 | Bolt, Mounting Bracket To Radiator (Top) | 2 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Fan Drive (With Hardening Pulley)(#21282-)
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***12 | Bolt,(With Cylinder Cover) | 6 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Fan Drive (With Non Hardening Pulley)
| 01***12 | Bolt,(With Cylinder Cover) | 6 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***45 | Bolt, Mounting Bracket To Radiator (Top) | 2 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Fan Pulley (Hardening Pulley) (With Air Conditioner Type)
| 04***53 | V-Belt,(For Add. Air Compressor) | 1 |
| 04***70 | V-Belt Set,Fan Drive | 1 |
| 62***50 | Pulley? Hardening | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Fan Pulley (Hardening Pulley) (Without Air Conditioner Type)
| 04***70 | V-Belt Set,Fan Drive | 1 |
| 62***50 | Pulley? Hardening | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Fan Pulley (Non Hardening Pulley) (With Air Conditioner Type)
| 04***53 | V-Belt,(For Add. Air Compressor) | 1 |
| 04***70 | V-Belt Set,Fan Drive | 1 |
| 62***20 | Pulley?Non Hardening | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Fan Pulley (Non Hardening Pulley) (Without Air Conditioner Type)
| 04***70 | V-Belt Set,Fan Drive | 1 |
| 62***20 | Pulley?Non Hardening | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Flywheel
| 61***51 | Gear, Ring | 1 |
| 62***50 | Bolt | 6 |
| 62***00 | Flywheel Ass'Y | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Flywheel Housing
| 01***45 | Bolt,(For Slag Handling) | 8 |
| 01***60 | Bolt, Hanger Bearing Mounting | 2 |
| 07***16 | Gasket,(For Pc750-6) (See Fig.A2110) | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Front Cover
| 01***10 | Bolt,(With Auto Emergency Steering) | 2 |
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 2 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Front P.T.O.
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 5 |
| 01***35 | Bolt, Bolt, Mount Tubes To Switch And Work Pumps | 1 |
| 07***60 | O-Ring,(For Pc750?800?1800) (A2610) | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Fuel Filter
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 1 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Fuel Injection Pump (Coupling) (Inner Parts)
| DK***00 | Coupling,Cross | 1 |
| DK***00 | Nut | 2 |
| DK***00 | Bolt | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Fuel Injection Pump (Feed Pump) (Inner Parts)
| DK***20 | Bolt, Joint | 1 |
| DK***00 | Valve,Check | 2 |
| DK***80 | Feed Pump Ass'Y | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Fuel Injection Pump (Governor) (1/2) (Inner Parts)
| DK***20 | Flyweight Ass'Y | 1 |
| DK***00 | Shim? 2.00mm,(High Altitude Spec.) | 0 |
| DK***10 | Governor Ass'Y | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Fuel Injection Pump (Governor) (2/2) (Inner Parts)
| DK***00 | Spring,Governor | 1 |
| DK***20 | Lever | 1 |
| DK***00 | Nut,Cap | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Fuel Injection Pump (Pump) (1/2) (Inner Parts)
| 62***70 | Injection Pump A | 1 |
| DK***30 | Bearing,Roller | 2 |
| DK***00 | Coupling | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Fuel Injection Pump (Pump) (2/2) (Inner Parts)
| DK***00 | Shim? 0.875mm | 0 |
| DK***00 | Shim? 0.500mm | 0 |
| DK***00 | Shim? 1.575mm | 0 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Fuel Injection Pump Mounting
| 01***90 | Bolt,(For No?1 And No?3 Housing) | 4 |
| 01***16 | Washer,Radio Controlled Slag Handling | 4 |
| 61***50 | Bolt | 4 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Fuel Return(#17626-19797)
| 07***70 | Tube,Spill | 1 |
| 07***85 | Clip | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Fuel Return(#19798-)
| 07***12 | Tube,(See Fig.0404-10) | 1 |
| 07***85 | Clip | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Head Cover(#17626-19971)
| 01***65 | Bolt,R.H | 18 |
| 62***10 | Cover,Rocker Arm Housing | 6 |
| 62***20 | Washer | 18 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Head Cover(#19972-)
| 01***55 | Screw | 18 |
| 62***11 | Cover,Rocker Arm Housing | 6 |
| 62***20 | Gasket, Rocker Lever Housing | 6 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Heater Switch Wiring
| 01***10 | Bolt,(With Auto Emergency Steering) | 2 |
| 01***14 | Bolt - Fuel Sensor Mounting | 1 |
| 01***10 | Washer,(For 35a Alternator) | 2 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Idler Gear
| 01***30 | Bolt,(Cold Terrain Spec.) | 6 |
| 61***60 | Pin, Dowel | 1 |
| 61***43 | Bolt | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Injection Bracket And Piping
| 01***25 | Bolt,(For Automatic) | 4 |
| 01***35 | Bolt | 4 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 4 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Injection Nozzle
| 01***20 | Bolt, Mount Main Relief Valve | 6 |
| 07***21 | O-Ring,Oil Cooler Pipe | 12 |
| 07***12 | Gasket,Mechanical Pump Piping | 12 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Injection Pump Drive
| 01***16 | Bolt,(For Slag Handling) | 3 |
| 01***19 | Nut | 1 |
| 01***16 | Washer,(For Shipping) | 3 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Injection Pump Lubricator
| 07***12 | Gasket,(Without Air Compressor Type) (K1) | 2 |
| 07***14 | Screw, Banjo Connector (M10) | 1 |
| 62***10 | Tube,Supply | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Injection Pump Safety Guard
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***15 | Bolt,(With Air Conditioner Type) | 2 |
| 01***32 | Washer,(With Auto Emergency Steering) | 4 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Muffler
| 01***45 | Bolt,(For Suction? Reversible Fan) | 3 |
| 01***50 | Bolt | 1 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Name Plate And Caution Plate (Arabic)
| 04***50 | Screw | 4 |
| 09***91 | Plate? Name,(Limited Supply) (Arabic) | 1 |
| 09***61 | Plate? Instruction,Air Cleaner (Double Element) | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Name Plate And Caution Plate (Chinese)
| 04***50 | Screw | 4 |
| 09***40 | Plate? Name,(Limited Supply) | 1 |
| 09***61 | Plate? Instruction,(Chinese) (Not Shown) | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Name Plate And Caution Plate (Czech)
| 04***50 | Screw | 4 |
| 09***40 | Plate? Name,(Limited Supply) | 1 |
| 09***61 | Plate? Instruction,(Czechoslovaskian) | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Name Plate And Caution Plate (English)
| 04***50 | Screw | 4 |
| 09***40 | Plate? Name,(Limited Supply) (English) | 1 |
| 09***61 | Plate? Instruction,Air Cleaner (Single Element) | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Name Plate And Caution Plate (French-English)
| 04***50 | Screw | 4 |
| 09***40 | Plate? Name,(Limited Supply) (French) | 1 |
| 09***62 | Plate? Instruction,Air Cleaner (Double Element) | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Name Plate And Caution Plate (German-English)
| 04***50 | Screw | 4 |
| 09***40 | Plate? Name,(Limited Supply) (German) | 1 |
| 09***61 | Plate? Instruction,(German-English) (Not Shown) | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Name Plate And Caution Plate (Greek-English)
| 04***50 | Screw | 4 |
| 09***40 | Plate? Name,(Limited Supply) | 1 |
| 09***61 | Plate? Instruction,(Greek-English) | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Name Plate And Caution Plate (Indonesian-English)
| 04***50 | Screw | 4 |
| 09***40 | Plate? Name,(Limited Supply) | 1 |
| 09***61 | Plate? Instruction,(Indonesian-English)(Not Shown | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Name Plate And Caution Plate (Italian-English)
| 04***50 | Screw | 4 |
| 09***40 | Plate? Name,(Limited Supply) | 1 |
| 09***61 | Plate? Instruction,(Italian-English) (Not Shown) | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Name Plate And Caution Plate (Persian)
| 04***50 | Screw | 4 |
| 09***91 | Plate? Name,(Limited Supply) (Persian) | 1 |
| 09***61 | Plate? Instruction,(Persian-English) (Not Shown) | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Name Plate And Caution Plate (Polish-English)
| 04***50 | Screw | 4 |
| 09***40 | Plate? Name,(Limited Supply) | 1 |
| 09***62 | Plate? Instruction,Air Cleaner | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Name Plate And Caution Plate (Portuguese-English)
| 04***50 | Screw | 4 |
| 09***40 | Plate? Name,(Limited Supply) | 1 |
| 09***61 | Plate? Instruction,(Portuguese-English)(Not Shown | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Name Plate And Caution Plate (Russian)
| 04***50 | Screw | 4 |
| 09***40 | Plate? Name,(Limited Supply) | 1 |
| 09***62 | Plate? Instruction,(English-Russian) | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Name Plate And Caution Plate (Spanish-English)
| 04***50 | Screw | 4 |
| 09***40 | Plate? Name,(Limited Supply) | 1 |
| 09***61 | Plate? Instruction,(Spanish-English) (Not Shown) | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Oil Cooler
| 01***20 | Bolt,(With Auto Emergency Steering) | 2 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 13 |
| 01***60 | Bolt, Mount Tube To Switch Pump | 2 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Oil Cooler (Cold Terrain Spec.)
| 01***20 | Bolt,(With Auto Emergency Steering) | 2 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 13 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Oil Filter
| 01***16 | Bolt,(For Slag Handling) | 3 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***60 | Bolt, Mount Tube To Switch Pump | 5 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Oil Level Gauge (With Oil Pan Heater)
| 01***16 | Bolt (With Air Heater & Conditioner) | 1 |
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 1 |
| 01***16 | Washer,(For 35a Alternator) | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Oil Level Gauge (Without Oil Pan Heater)
| 01***16 | Bolt (With Air Heater & Conditioner) | 1 |
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 1 |
| 01***16 | Washer,(For 35a Alternator) | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Oil Pan And Suction Tube (With Oil Pan Heater)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***30 | Bolt,(For France Noise Suppression) | 1 |
| 01***12 | Bolt, Bolt,(No Need To Quick Shift) | 3 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Oil Pan And Suction Tube (Without Oil Pan Heater)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***30 | Bolt,(For France Noise Suppression) | 1 |
| 01***12 | Bolt, Bolt,(No Need To Quick Shift) | 3 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Oil Pump
| 01***25 | Bolt,(Without Auto Priming System) | 4 |
| 01***30 | Bolt,Radio Controlled Slag Handling | 1 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 2 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Piston
| 02***13 | Pin, Dowel | 2 |
| 04***20 | Ring, Retaining | 12 |
| 62***41 | Metal Ass'Y | 6 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Rocker Arm And Housing(#17626-19971)
| 01***08 | Nut,R.H. Thread | 12 |
| 01***32 | Washer, (Without Emergency Steering) | 16 |
| 01***32 | Washer, (Without Emergency Steering) | 6 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Rocker Arm And Housing(#19972-)
| 01***80 | Bolt (M12-2.00x80) | 6 |
| 01***80 | Bolt (M10-1.50x80) | 16 |
| 01***20 | Bolt (M12-1.75x120) | 12 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Spare Parts(#17626-19971)
| 04***70 | V-Belt Set,Fan Drive | 1 |
| 60***30 | Cartridge,Oil Filter | 1 |
| 60***31 | Cartridge,Fuel Filter | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Spare Parts(#19972-)
| 04***70 | V-Belt Set,Fan Drive | 1 |
| 60***30 | Cartridge,Oil Filter | 1 |
| 60***31 | Cartridge, Oil Filter | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Starting Motor (11kw) (Inner Parts)
| 60***22 | Starting Motor Ass'Y,(11kw) | 1 |
| SD***X9 | Switch Ass'Y,Engage | 1 |
| SD***X0 | Bearing,Ball | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Starting Motor Mounting (11kw)
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 1 |
| 01***40 | Bolt,(With Center Guard) | 3 |
| 01***16 | Washer,(With Water Separator) | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Turbocharger (Inner Parts)(#17626-19682)
| 01***16 | Bolt,(For Slag Handling) | 4 |
| 01***16 | Bolt | 8 |
| 04***08 | Pin, Dowel | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Turbocharger (Inner Parts)(#19683-)
| 01***16 | Bolt | 8 |
| 04***50 | Screw | 2 |
| 65***50 | V-Band | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Turbocharger Mounting And Lubricator(#17626-20659)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 3 |
| 01***45 | Screw | 2 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Turbocharger Mounting And Lubricator(#20660-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 3 |
| 01***45 | Screw | 4 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Water Pump Gasket Kit
| 02***37 | O-Ring,(For Pc750?1800) (A5010) | 2 |
| 07***70 | O-Ring,(For Intake Air Cover) | 1 |
| 07***15 | O-Ring,(For Low Speed) (D40pf) | 1 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Water Pump(#17626-19971)
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 6 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 3 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Water Pump(#19972-)
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 6 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 3 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
Komatsu : S6d140-1w(S/N 17626-Up) : Engine : Water Separator
| 07***12 | Gasket,Mechanical Pump Piping | 1 |
| 60***31 | Separator Assembly, Water | 1 |
| 60***60 | Plug,Drain (4d105-5h? 4d105-5t) | 1 |
S6D140-1W(S/N 17626-UP) serial number reference
The engine serial number is stamped on the engine block, typically on the left side near the injection pump or on a metal data plate affixed to the engine. The machine PIN plate is riveted to the right-hand side of the cab on the lower frame, typically just behind the front idler or beneath the operator's window. Read the prefix from the engine model designation on the engine data plate, not the machine PIN.
| Prefix | Identifies | Notes |
|---|---|---|
| S6D140-1W | S6D140-1W | S/N 17626-UP. Factory spec sheet for the S6D140-1W engine series. The prefix identifies the engine model family; the suffix -1W denotes the specific industrial configuration variant. No further alphanumeric PIN prefixes are documented for this exact serial range in the provided sources. Verify with your dealer for specific machine build codes. |
| S6D140-1W-F | S6D140-1W-F | S/N 10001-UP. Factory spec sheet for the S6D140-1W-F engine series. This is a distinct variant from the S6D140-1W. No further alphanumeric PIN prefixes are documented for this exact serial range in the provided sources. Verify with your dealer for specific machine build codes. |
Frequently asked questions
What engine does the Komatsu S6D140-1W use?
The Komatsu S6D140-1W is a six-cylinder diesel engine with a displacement of 15.2 liters. It features a bore of 140 mm and is used in heavy-duty Komatsu construction equipment.
What is the operating weight of machines powered by this engine?
Machines powered by the S6D140-1W engine typically have operating weights ranging from 34,000 to 80,000 lb, depending on the specific model configuration such as wheel loaders or excavators.
What replaced the Komatsu S6D140-1W?
The S6D140-1W is part of the S6D140 series lineage. Newer models have transitioned to updated Tier 4 compliant engines, with specific replacements varying by machine class and production year.
What S6D140-1W(S/N 17626-UP) owners discuss
What are the typical powertrain and hydraulic behaviors associated with the Komatsu S6D140-1W engine series?
The S6D140-1W engine is known for strong hydraulic performance and fuel efficiency. However, community consensus indicates that hydraulic pump failures often precede engine failure, leading to poor resale values for machines in this series. Operators report that Dash 6 machines specifically suffer from valve problems on PC150 and PC120 models. The engine is designed to wear out complete machines simultaneously rather than failing gradually, which is a noted characteristic of the Komatsu line during this era.
What undercarriage or wear patterns are typical for machines powered by this engine?
Machines equipped with the S6D140-1W often exhibit undercarriage wear patterns consistent with heavy earthmoving applications. Operators report that track tension issues and roller wear are common, particularly when mud or debris becomes packed into the undercarriage. The design philosophy of the era suggests that undercarriage components may wear out in conjunction with major powertrain failures, requiring simultaneous replacement to restore machine integrity.
What are the known engine quirks for the S6D140-1W series?
The S6D140-1W is a six-cylinder diesel engine with a displacement of 15.2 liters and a bore of 140 mm. It features hardened liners, high-alloy rings, and a Bosch-style fuel system with injectors operating at 3,200 PSI. Unlike later models, this series lacks an ECM, meaning it relies on mechanical governors and injection pumps. Operators note that turbocharger seal seepage and cracked or loose air intake ducting are common issues due to constant thermal cycling. Cold-start discipline is required, including the use of intake air heaters or ether-assist starting aids in low-temperature environments.
What are the common electrical or sensor issues for this engine?
Because the S6D140-1W lacks an ECM, it does not generate fault codes. Electrical issues typically manifest as intermittent starting, dashboard failures, or random shutdowns rather than specific sensor errors. Owners report that unstable power supplies or faulty sensors can trigger multiple warning signals. Without electronic diagnostics, operators must rely on physical inspection of grounds, connectors, and the starter relay to diagnose electrical faults.
What should be checked when buying a used machine with the S6D140-1W engine?
When evaluating a used machine, verify engine oil pressure, which should read 40 to 45 lbs during run tests. Check for signs of coolant corrosion, particularly pitting in the block and head caused by neglect of the corrosion resistor cartridge. Inspect the turbocharger for seal seepage and the air intake ducting for cracks. Since the engine has no ECM, perform scheduled oil sampling to catch wear-metal trends in the injection pump and turbocharger bearings. Verify the condition of the hydraulic pump and valves, as these are common failure points that often accompany engine wear.
What fluids are recommended for the S6D140-1W engine and associated systems?
Komatsu recommends using Komatsu Genuine Oil Specifications for all systems. For the engine, use diesel engine oil meeting Komatsu Engineering Standards. For the hydraulic system, use hydraulic oil HO (ISO VG46 or ISO VG56 depending on temperature). For the powertrain, use powertrain oil TO (SAE 10W or SAE 30). For the axle, use axle oil AXO (SAE 80W). Coolant should be Super-coolant AF-NAC. Always verify the exact specification against the machine's operation and maintenance manual, as requirements vary by configuration and series.
What safety-critical fix is associated with the S6D140-1W in cold climates?
In cold climates, verify that the intake air heater or ether-assist starting aid is functional before each cold season. Switch to arctic-grade engine oil and fuel ahead of winter. Confirm coolant concentration protects against rated temperature. Failure to do so can lead to internal coolant passage pitting and engine damage. Have your dealer verify the cold-start system and coolant concentration before operation.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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