Komatsuengine(no series)
Komatsu SA6D140-1L(S/N 11397-UP (REAR ENGINE))
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu SA6D140-1L engine is a six-cylinder, turbocharged, and aftercooled diesel powerplant designed for heavy-duty construction applications. It is primarily installed in mid-to-large class crawler excavators, such as the PC750 and PC800 series, and heavy wheel loaders like the WA500. The engine displaces approximately 14.0 to 15.2 liters and delivers power ratings between 186 and 202 kW (249 to 270 hp). Production of this specific engine variant spans from the mid-1990s through the 2010s, serving as the power source for the D155A-5 bulldozer and HD325-6 dump truck in industrial configurations. The SA6D140-1L succeeded earlier SA6D140E models and was eventually replaced by the SA6D140E-2 and subsequent Tier-compliant iterations as emissions regulations tightened.
Across its production life, the SA6D140-1L evolved from mechanical fuel injection systems to more precise electronic controls in later serial ranges, adapting to stricter emissions standards without changing its fundamental block architecture. The machine remains critical in the used and parts market because it powers high-hour, high-value excavators and dozers that are still active in heavy earthmoving. Its robust cast-iron block and simple turbocharging make it a reliable candidate for rebuilds, while the widespread use of Komatsu Genuine Lubricants and standardized KOWA fluid analysis protocols ensures long-term serviceability. The engine's availability in both rear-engine and standard configurations allows it to fit a wide variety of chassis, sustaining a strong aftermarket for remanufactured assemblies and undercarriage components.
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 SA6D140-1L(S/N 11397-UP (REAR ENGINE)) specifications
Engine
| Model | SA6D140-1 |
| Series | 6D140-1 Series |
| Configuration | Rear Engine |
| Displacement | 14.0 L (854 cu in) |
| Cylinders | 6 |
| Type | Turbocharged, aftercooled diesel |
| 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
| Engine Weight | 1,000 kg (2,200 lb) |
Dimensions
| Engine Length | 1,524 mm (60 in) |
| Engine Width | 762 mm (30 in) |
| Engine Height | 1,143 mm (45 in) |
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 SA6D140-1L(S/N 11397-UP (REAR ENGINE)) maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
Servicing the SA6D140-1L(S/N 11397-UP (REAR ENGINE)) beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize the Komatsu Oil Wear Analysis (KOWA) program to monitor engine oil, hydraulic fluid, and coolant at every major service interval. Track wear metals like iron, copper, and lead in the oil to detect internal component degradation early. Check hydraulic fluid for ISO cleanliness codes and water content to prevent pump and valve damage. Monitor coolant pH and SCA concentration to avoid corrosion in the SA6D140-1L's cooling passages. Use KOMTRAX telematics to correlate fluid condition data with engine load and temperature trends for accurate predictive scheduling.
Corrective & Common Repairs
Address common SA6D140-1L issues by inspecting the turbocharger for shaft play and seal leaks during the 1,000-hour service. Check the fuel injection pump calibration data if power loss or excessive smoke occurs. Inspect the exhaust brake system for proper operation and wear. Replace worn belts and hoses during the 2,000-hour service to prevent sudden failure. Verify the integrity of the engine mounting bolts and flywheel housing bolts, as vibration can loosen these connections over time. Use Komatsu Genuine Lubricants to ensure proper viscosity and additive packages for the engine's specific tolerances.
Overhaul & Rebuild Points
Plan major overhaul intervals based on KOWA analysis results and performance testing rather than fixed hours. Key rebuild points include the cylinder head, cylinder block, and crankshaft assembly. Inspect the turbocharger and exhaust brake for wear limits during disassembly. Follow the factory service manual for precise torque values and clearances during reassembly. Use calibrated precision instruments to measure wear limits on the piston, rings, and bearings. Ensure the fuel injection pump is calibrated correctly after any internal engine work to maintain optimal performance and emissions compliance.
Seasonal & Environment Servicing
Adjust maintenance practices based on operating environment and season. In cold climates, use appropriate grade engine oil and ensure the cooling system is protected with the correct glycol concentration. In dusty environments, inspect the air filter more frequently and replace the outer element as needed. Check the radiator and oil cooler fins for debris buildup to prevent overheating. Monitor the DEF level and quality on Tier 4 machines to ensure proper SCR system function. Inspect the undercarriage and track tension more often in abrasive conditions to extend component life.
SA6D140-1L(S/N 11397-UP (REAR ENGINE)) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 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 → |
| 09637-02161 | Plate? Instruction,Air Cleaner (Double Element) | Air intake service | Check fitment → |
| 09637-30161 | Plate? Instruction,Air Cleaner (Single Element) | Air intake service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
SA6D140-1L(S/N 11397-UP (REAR ENGINE)) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| CA115 | Engine crankshaft speed sensor and backup speed sensor failure | Faulty speed sensor, broken wiring harness, or corroded connector at the sensor pin | Inspect the sensor wiring and connector for damage or corrosion; replace the speed sensor if voltage is abnormal |
| CA111 | Internal engine controller (ECM) fault | Electronic Control Module internal failure or software corruption | Replace or reprogram the ECM |
| CA451 | Common rail pressure sensor feedback value too high | Malfunctioning rail pressure sensor, actual overpressure condition, or wiring issue | Diagnose the fuel rail pressure sensor and check pump lines for blockage or leakage |
| CA441 | Battery voltage too low | Weak battery, failing alternator, or loose connections | Replace the battery or alternator; check the voltage regulator and connections |
| CA442 | Battery voltage too high | Failing voltage regulator or alternator overcharging | Replace the alternator or battery; check the voltage regulator |
| AA10NX | Air cleaner clogging | Clogged air filter element due to dust or debris | Replace the air filter element |
| B@BCNS | Engine coolant overheating | Low coolant level, blocked radiator fins, or failed fan belt | Check radiator fins, fan belt, and coolant level; clean debris from the radiator |
| CA122 | Intake air pressure sensor feedback voltage too high | Faulty intake pressure sensor or wiring short | Verify the intake pressure sensor operation and inspect wiring for shorts |
| CA123 | Intake air pressure sensor feedback voltage too low | Sensor short circuit or severe airflow restriction | Check for a sensor short or an airflow restriction in the intake system |
| CA234 | Engine overspeed | Throttle calibration error, engine load cycle issue, or operator misuse | Verify throttle calibration, check engine load cycle, and review operator usage |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
SA6D140-1L(S/N 11397-UP (REAR ENGINE)) attachments & work tools
Wheel Loader Attachments
The SA6D140-1L engine is primarily associated with the Komatsu WA500-1L wheel loader. Standard work tools for this class include general-purpose buckets and heavy-duty rock buckets. Mounting systems utilize the WA-series quick coupler interface, with hydraulic lines routed through the loader boom for auxiliary functions.
Crawler Excavator Attachments
This engine powers the PC650-3 and PC710-5 excavator models. Typical work tools include digging buckets, trenching buckets, and grading buckets. Hydraulic breakers and hammers are supported via auxiliary hydraulic circuits, requiring specific flow and pressure configurations compatible with the machine's main pump output.
Crawler Dozer Attachments
The SA6D140-1L is used in the D155AX-5 and D355C-3 dozers. Standard implements include straight blade (S-blade) and semi-U blades for earthmoving, alongside U-blades for high-capacity material handling. Ripper configurations vary by model, with single-shank or multi-shank options available for rock and hard soil applications.
Mining Dump Truck Attachments
Applications include the HD325-7, HD405-7, HM300, HM350, HM400, and HD785 haul trucks. These vehicles do not use interchangeable work tools but rely on fixed dump bodies. Guarding options include underbody protection and side skirts to prevent material buildup and protect hydraulic lines during operation.
Industrial/Generator Sets
The engine is configured for the DCA-400SSK generator set. This application does not use external work tools but requires specific mounting frames and vibration isolation systems. Factory configurations include sound-attenuated enclosures and exhaust silencing systems to meet industrial noise standards.
All SA6D140-1L(S/N 11397-UP (REAR ENGINE)) assemblies by section
Every catalogued assembly group for the Komatsu SA6D140-1L(S/N 11397-UP (REAR ENGINE)). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Accessory
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Accessory : Air Compressor
| 62***21 | Air Compressor Ass'Y | 1 |
| DK***20 | Unloader Valve A | 1 |
| DK***00 | Seat,Intake Valve | 1 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Accessory : Air Compressor And Piping(#11397-14616)
| 01***35 | Bolt, Mount Bracket To Floor | 1 |
| 01***12 | Nut | 1 |
| 01***60 | Flat Washer - M20 (Hardened) | 1 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Accessory : Air Compressor And Piping(#14617-17629)
| 01***35 | Bolt, Mount Bracket To Floor | 1 |
| 01***12 | Nut | 1 |
| 07***12 | Gasket,(Without Air Compressor Type) (K2) | 6 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Accessory : Air Compressor And Piping(#17630-)
| 01***35 | Bolt, Mount Bracket To Floor | 1 |
| 01***30 | Bolt | 3 |
| 01***12 | Nut | 1 |
Cooling System
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cooling System : Cooling Fan
| 60***80 | Fan,Cooling | 1 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cooling System : Corrosion Resistor And Piping(#11397-11982)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 2 |
| 01***08 | Nut,(For Canvas Canopy?Head Guard) | 2 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cooling System : Corrosion Resistor And Piping(#11983-17629)
| 02***25 | Bolt,(Europe Spec.) | 4 |
| 07***12 | Gasket,(Without Air Compressor Type) (K1) | 7 |
| 07***14 | Screw, Banjo Connector (M10) | 2 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cooling System : Corrosion Resistor And Piping(#17630-)
| 02***25 | Bolt,(Cold Weather Spec.) | 4 |
| 07***12 | Gasket,(Without Air Compressor Type) (K1) | 7 |
| 07***14 | Screw, Banjo Connector (M10) | 2 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cooling System : Tension Pulley And Mounting
| 01***16 | Bolt,(For Slag Handling) | 2 |
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cooling System : Water Pump And Mounting
| 01***90 | Bolt, Fan Mounting | 3 |
| 01***95 | Bolt,(For 2nd Travel Speed) (Op) | 3 |
| 01***65 | Screw | 5 |
Cylinder Block
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cylinder Block : Camshaft
| 04***25 | Key, Plain Woodruff | 1 |
| 04***12 | Ring, Retaining | 24 |
| 61***20 | Ball | 1 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cylinder Block : Crankshaft(#11397-17791)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 6 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 6 |
| 01***32 | Washer,(With Auto Emergency Steering) | 6 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cylinder Block : Crankshaft(#17792-)
| 01***30 | Bolt,(Not Used With Emergency Str.) | 6 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 6 |
| 04***24 | Pin,Dowel (For No.3 Housing) | 1 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cylinder Block : Cylinder Block
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 2 |
| 01***25 | Screw | 6 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cylinder Block : Cylinder Block Cover(#11397-11982)
| 01***16 | Bolt,(Sandy And Dusty Spec.) | 1 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 5 |
| 01***60 | Bolt, Mount Tube To Switch Pump | 1 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cylinder Block : Cylinder Block Cover(#11983-)
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 5 |
| 01***60 | Bolt, Mount Tube To Switch Pump | 1 |
| 01***70 | Bolt, Mount Bracket And Oil Inlet Tube, Bolt | 1 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cylinder Block : Flywheel And Flywheel Housing(#11397-11982)
| 01***45 | Bolt,(For Slag Handling) | 10 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 3 |
| 07***16 | Gasket,(For Pc750-6) (See Fig.A2110) | 1 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cylinder Block : Flywheel And Flywheel Housing(#11983-)
| 01***45 | Bolt,(For Slag Handling) | 8 |
| 01***60 | Bolt, Hanger Bearing Mounting | 2 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 1 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cylinder Block : Front Cover And Front Bracket
| 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 : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cylinder Block : Idler Gear
| 01***30 | Bolt,(Cold Terrain Spec.) | 6 |
| 01***80 | Bolt | 1 |
| 01***45 | Washer,(Without R.O.P.S.) | 1 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cylinder Block : Oil Pan(#11397-11982)
| 01***30 | Bolt,(For France Noise Suppression) | 2 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 36 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cylinder Block : Oil Pan(#11983-17791)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***12 | Bolt, Bolt,(No Need To Quick Shift) | 3 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cylinder Block : Oil Pan(#17792-)
| 01***35 | Bolt, Mounting - Flywheel Housing End | 2 |
| 01***12 | Bolt, Bolt,(No Need To Quick Shift) | 3 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 40 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cylinder Block : Piston And Connecting Rod
| 02***13 | Pin, Dowel | 2 |
| 04***20 | Ring, Retaining | 12 |
| 62***40 | Metal Ass'Y | 6 |
Cylinder Head
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cylinder Head : Air Cleaner And Mounting(#11397-17629)
| 01***40 | Bolt,(Dust And Dirt Protection) | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 3 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cylinder Head : Air Cleaner And Mounting(#17630-)
| 01***40 | Bolt,(Dust And Dirt Protection) | 4 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 3 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cylinder Head : Air Intake Manifold And After Cooler(#11397-17629)
| 01***00 | Bolt, Mount Back-Up Alarm | 12 |
| 01***55 | Bolt | 12 |
| 01***90 | Screw | 22 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cylinder Head : Air Intake Manifold And After Cooler(#17630-)
| 01***00 | Bolt, Mount Back-Up Alarm | 12 |
| 01***55 | Bolt | 12 |
| 01***95 | Bolt | 20 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cylinder Head : Cylinder Head(#11397-17234)
| 04***20 | Pin,Dowel (Welded) | 2 |
| 07***25 | O-Ring,Lubrication Valve | 1 |
| 07***08 | Plug (Kit) | 1 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cylinder Head : Cylinder Head(#17235-17629)
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 1 |
| 02***04 | Plug, Pipe | 6 |
| 04***20 | Pin,Dowel (Welded) | 2 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cylinder Head : Cylinder Head(#17630-)
| 01***20 | Bolt (M10-1.75x120) | 6 |
| 04***20 | Pin,Dowel (Welded) | 2 |
| 07***25 | O-Ring,Lubrication Valve | 1 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cylinder Head : Exhaust Manifold And Turbocharger
| 01***45 | Bolt,(For Suction? Reversible Fan) | 3 |
| 01***50 | Bolt | 1 |
| 01***55 | Screw | 2 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cylinder Head : Heat Shield(#17630-)
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 6 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 9 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 11 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cylinder Head : Muffler(#11397-11982)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***50 | Bolt | 2 |
| 01***55 | Bolt,(For Suction? Reversible Fan) | 4 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cylinder Head : Muffler(#11983-17629)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 3 |
| 01***50 | Bolt | 2 |
| 01***55 | Bolt,(For Suction? Reversible Fan) | 4 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cylinder Head : Muffler(#17630-)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 3 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 2 |
| 01***55 | Bolt,(For Suction? Reversible Fan) | 1 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cylinder Head : Rocker Arm And Housing(#11397-17234)
| 01***08 | Nut,R.H. Thread | 12 |
| 01***16 | Washer,(For Shipping Parts) | 18 |
| 01***23 | Washer,(For Chinese) | 6 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cylinder Head : Rocker Arm And Housing(#17235-17629)
| 01***20 | Bolt | 1 |
| 01***08 | Nut,R.H. Thread | 12 |
| 01***16 | Washer,Radio Controlled Slag Handling | 1 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cylinder Head : Rocker Arm And Housing(#17630-)
| 01***20 | Bolt | 1 |
| 01***90 | Bolt,(For No?1 And No?3 Housing) | 1 |
| 01***80 | Bolt (M12-2.00x80) | 6 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cylinder Head : Rocker Arm Housing Cover(#11397-17629)
| 01***65 | Bolt,R.H | 18 |
| 62***10 | Cover,Rocker Arm Housing | 6 |
| 62***20 | Washer | 18 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cylinder Head : Rocker Arm Housing Cover(#17630-)
| 01***55 | Screw | 18 |
| 62***11 | Cover,Rocker Arm Housing | 6 |
| 62***20 | Gasket, Rocker Lever Housing | 6 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cylinder Head : Turbocharger(#11397-17629)
| 01***16 | Bolt,(For Slag Handling) | 4 |
| 01***16 | Bolt | 8 |
| 01***16 | Bolt | 8 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cylinder Head : Turbocharger(#17630-)
| 01***16 | Bolt,(For Slag Handling) | 4 |
| 01***16 | Bolt | 8 |
| 04***08 | Pin, Dowel | 1 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Cylinder Head : Water Piping
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 4 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
Electrical System
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Electrical System : Alternator (50a)
| 60***21 | Alternator A. (50a),(With Hardening Pulley) | 1 |
| SD***X0 | Coil Assembly | 1 |
| SD***X0 | Washer | 1 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Electrical System : Alternator (75a)
| 60***30 | Alternator A. (75a) | 1 |
| SD***X0 | Coil Assembly | 1 |
| SD***X0 | Washer | 1 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Electrical System : Alternator And Mounting (50a)
| 01***20 | Bolt,(With Auto Emergency Steering) | 3 |
| 01***00 | Bolt, Mount Back-Up Alarm | 1 |
| 01***30 | Bolt,(For Trimming Dozer) | 1 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Electrical System : Alternator And Mounting (75a)
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 3 |
| 01***00 | Bolt, Mount Back-Up Alarm | 1 |
| 01***30 | Bolt,(For Trimming Dozer) | 1 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Electrical System : Starting Motor (7.5kw)
| 60***30 | Starting Motor Ass'Y,(7.5kw) | 1 |
| KD***20 | Magnetic Switch Assembly | 1 |
| KD***40 | Spring,Spring | 4 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Electrical System : Starting Motor And Mounting (7.5kw)
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 1 |
| 01***40 | Bolt,(With Center Guard) | 3 |
| 01***16 | Bolt - Starting Motor Ground Cable | 1 |
Fuel System
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Fuel System : Fuel Filter And Piping(#11397-17629)
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***15 | Bolt,(With Air Conditioner Type) | 2 |
| 01***16 | Washer,Radio Controlled Slag Handling | 4 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Fuel System : Fuel Filter And Piping(#17630-)
| 01***25 | Bolt,(For Automatic) | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 3 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Fuel System : Fuel Injection Pump (Coupling)(#11397-15282)
| ND***10 | Nut | 1 |
| ND***80 | Bolt | 2 |
| ND***61 | Bolt | 6 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Fuel System : Fuel Injection Pump (Coupling)(#15283-)
| ND***10 | Nut | 1 |
| ND***80 | Bolt | 2 |
| ND***61 | Bolt | 6 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Fuel System : Fuel Injection Pump (Feed Pump)(#11397-15282)
| ND***40 | Washer? 1mm,Plate | 1 |
| ND***10 | Spring,Tappet | 1 |
| ND***70 | Washer,Union | 4 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Fuel System : Fuel Injection Pump (Feed Pump)(#15283-)
| ND***40 | Washer? 1mm,Plate | 1 |
| ND***10 | Spring,Tappet | 1 |
| ND***70 | Washer,Union | 4 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Fuel System : Fuel Injection Pump (Governor) (1/2)(#11397-15282)
| ND***40 | Plate,Thrust | 1 |
| ND***60 | Shackle Ass'Y | 1 |
| ND***71 | Lever Ass'Y,Control | 1 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Fuel System : Fuel Injection Pump (Governor) (1/2)(#15283-)
| ND***40 | Plate,Thrust | 1 |
| ND***60 | Shackle Ass'Y | 1 |
| ND***71 | Lever Ass'Y,Control | 1 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Fuel System : Fuel Injection Pump (Governor) (2/2)(#11397-15282)
| ND***80 | Pin,Stop | 1 |
| ND***20 | Washer? 1.0mm,Cover Plate | 2 |
| ND***00 | Screw,Adjusting | 1 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Fuel System : Fuel Injection Pump (Governor) (2/2)(#15283-)
| ND***80 | Pin,Stop | 1 |
| ND***20 | Washer? 1.0mm,Cover Plate | 2 |
| ND***00 | Screw,Adjusting | 1 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Fuel System : Fuel Injection Pump (Pump) (1/2)(#11397-15282)
| 62***20 | Injection Pump A | 1 |
| 62***21 | Injection Pump A | 1 |
| ND***81 | Screw | 2 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Fuel System : Fuel Injection Pump (Pump) (1/2)(#15283-)
| 62***22 | Injection Pump A | 1 |
| 62***23 | Injection Pump A | 1 |
| 62***24 | Injection Pump A | 1 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Fuel System : Fuel Injection Pump (Pump) (2/2)(#11397-15282)
| ND***40 | Washer | 12 |
| ND***30 | Spring,Plunger | 6 |
| ND***10 | Shim? 1.55mm | 0 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Fuel System : Fuel Injection Pump (Pump) (2/2)(#15283-)
| ND***40 | Washer | 12 |
| ND***30 | Spring,Plunger | 6 |
| ND***10 | Shim? 1.55mm | 0 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Fuel System : Fuel Injection Pump And Piping(#11397-17629)
| 01***16 | Bolt,(For Slag Handling) | 3 |
| 01***25 | Bolt,(For Automatic) | 4 |
| 01***35 | Bolt | 4 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Fuel System : Fuel Injection Pump And Piping(#17630-)
| 01***16 | Bolt,(For Slag Handling) | 3 |
| 01***25 | Bolt,(For Automatic) | 4 |
| 01***35 | Bolt | 4 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Fuel System : Fuel Injection Pump Linkage(#11397-15282)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 3 |
| 01***00 | Bolt (M10-1.50x100) | 3 |
| 01***10 | Bolt | 2 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Fuel System : Fuel Injection Pump Linkage(#15283-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 5 |
| 01***14 | Screw | 2 |
| 01***12 | Bolt,(See Fig.0501) | 1 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Fuel System : Fuel Nozzle And Spill Pipe(#11397-17629)
| 01***20 | Bolt, Mount Main Relief Valve | 6 |
| 01***10 | Nut,(Service Only) | 6 |
| 07***21 | O-Ring,Oil Cooler Pipe | 12 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Fuel System : Fuel Nozzle And Spill Pipe(#17630-)
| 01***20 | Bolt, Mount Main Relief Valve | 6 |
| 07***21 | O-Ring,Oil Cooler Pipe | 12 |
| 07***12 | Gasket,Mechanical Pump Piping | 12 |
Lubricating Oil System
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Lubricating Oil System : Lubricating Oil Cooler
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Lubricating Oil System : Lubricating Oil Filter And Piping(#11397-17629)
| 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 : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Lubricating Oil System : Lubricating Oil Filter(#17630-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 19 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 8 |
| 01***45 | Bolt,(For Power Tilt Mech Angle) | 4 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Lubricating Oil System : Lubricating Oil Pump And Suction Pipe(#11397-11982)
| 01***25 | Bolt,(Without Auto Priming System) | 4 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 1 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Lubricating Oil System : Lubricating Oil Pump And Suction Pipe(#11983-)
| 01***25 | Bolt,(Without Auto Priming System) | 4 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 1 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 3 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Lubricating Oil System : Oil Adapter(#17630-)
| 01***16 | Bolt,(For Slag Handling) | 3 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 2 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Lubricating Oil System : Turbocharger Lubricating Oil Piping(#11397-17629)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Lubricating Oil System : Turbocharger Lubricating Oil Piping(#17630-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 3 |
| 01***32 | Washer, (Without Emergency Steering) | 1 |
Tool And Kit
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Tool And Kit : Air Compressor Gasket Kit
| 07***25 | Gasket (Kit) | 1 |
| 07***40 | Gasket (K8) | 1 |
| 07***12 | Gasket,(Without Air Compressor Type) (K2) | 4 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Tool And Kit : Cylinder Block Gasket Kit
| 06***04 | Seal,Bearing (Kit) | 2 |
| 07***60 | O-Ring,(For Pc750?800?1800) (A2610) | 1 |
| 07***65 | O-Ring,Injection Pump Case | 1 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Tool And Kit : Cylinder Head Gasket Kit
| 02***75 | O-Ring,(For Japan) (K1) | 4 |
| 02***81 | O-Ring,Air Connector | 2 |
| 07***25 | O-Ring,Corrosion Resistor | 4 |
Komatsu : Sa6d140-1l(S/N 11397-Up (Rear Engine)) : Tool And Kit : Water Pump Gasket Kit
| 02***37 | O-Ring,(For Pc750?1800) (A5010) | 2 |
| 07***55 | O-Ring,Front Accessory Drive | 2 |
| 07***70 | O-Ring,(For Intake Air Cover) | 1 |
SA6D140-1L(S/N 11397-UP (REAR ENGINE)) 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 tag affixed to the valve cover area. The prefix is the alphanumeric model code (SA6D140-1L) stamped on this plate, followed by the sequential serial number starting from 11397 for this specific rear-engine variant.
| Prefix | Identifies | Notes |
|---|---|---|
| SA6D140-1L | Rear Engine | S/N 11397-UP. This specific serial range and variant designation are confirmed in the Komatsu SA6D140-1L parts catalog for the WA500-1L wheel loader. The 'Rear Engine' configuration distinguishes it from the standard front-engine layout. Verify with dealer for specific machine model applications and corresponding chassis PINs. |
Frequently asked questions
What is the engine type and displacement of the Komatsu SA6D140-1L?
The Komatsu SA6D140-1L is a six-cylinder, in-line, turbocharged, and aftercooled diesel engine with a displacement of approximately 14.0 to 15.2 liters (854 cubic inches).
What is the operating weight range of machines powered by this engine?
Machines equipped with the SA6D140-1L engine, such as the PC750 and PC800 excavators and WA500 wheel loader, typically have operating weights ranging from 34,000 to 87,083 lb (15,420 to 39,450 kg), varying by configuration and attachment.
What engine replaced the SA6D140-1L in later Komatsu models?
The SA6D140-1L was succeeded by the SA6D140E-2 and subsequent Tier-compliant variants, such as the SAA6D140E-5 and SAA6D140E-6, which incorporated updated emissions control technologies while maintaining the same basic engine architecture.
What SA6D140-1L(S/N 11397-UP (REAR ENGINE)) owners discuss
What are the typical powertrain and hydraulic behaviors associated with the Komatsu SA6D140-1L engine series?
The SA6D140-1L engine is known for smooth operation and high fuel efficiency. The hydraulic system is generally robust, but owners report that if the main hydraulic pump fails, the engine often suffers significant damage shortly after. This correlation is a primary reason for lower resale values on older Komatsu units. The engine design utilizes hardened liners and high-alloy piston rings, contrasting with earlier soft-liner designs. The fuel system operates at high pressure, with injectors firing at approximately 3,200 PSI, which contributes to its reliability compared to older PT-style fuel systems. Variations in pump flow settings and valve combinations exist across different machine generations, requiring model-specific diagnostics for hydraulic performance issues.
What undercarriage and wear patterns are typical for machines powered by this engine?
Machines equipped with the SA6D140-1L, such as the PC750-6 and PC800-6 excavators, experience standard heavy-duty wear on bushings, bearings, and track pads. Worn bushings often lead to increased noise and vibration, while degraded bearings can cause premature track failure. Undercarriage components are subjected to significant stress during continuous load operations. Owners note that the machine is designed to wear out complete systems simultaneously rather than in isolation, meaning undercarriage wear often coincides with hydraulic or engine component degradation. Regular inspection of track tension and roller condition is critical to prevent uneven wear and pulling to one side.
What are the known quirks or characteristics of the SA6D140-1L engine series?
The SA6D140-1L is a 6-cylinder diesel engine with a displacement of 15.2 liters. The bore for each cylinder measures 140 mm. The engine is designed for heavy earthmoving applications and is often found in rear-engine configurations for specific serial ranges (S/N 11397-UP). A key characteristic is its integration with Komatsu’s electronic control systems; while the engine itself is mechanically robust, it relies heavily on stable power supplies and functional sensors. Owners report that the engine performs best when maintained with approved lubricants and genuine parts. The engine’s durability is high, but it requires strict adherence to maintenance intervals to prevent issues like overheating or power loss under load.
What are common electrical or sensor issues reported for this engine/machine combination?
Komatsu machines with this engine rely heavily on electronic control systems. Common issues include intermittent starting, dashboard failures, and random shutdowns, often triggered by a single faulty sensor or unstable power supply. Owners report that multiple warning signals can appear simultaneously due to these electrical faults. Diagnosis should start with checking battery state of charge, engine and chassis grounds, and main starter cables. If the engine cranks but does not start, check for air entering the fuel supply or recent filter replacement errors. Fault codes should be read to pinpoint specific sensor failures rather than replacing components based on symptoms alone.
What should be checked when buying a used machine with the SA6D140-1L engine?
When purchasing a used machine with the SA6D140-1L engine, verify the exact serial prefix and configuration, as specs vary by model (e.g., PC750-6 vs. PC800-6). Check for signs of hydraulic system weakness, particularly if the machine operates slowly when hot, which indicates internal leakage in pumps or valves. Inspect the cooling package for debris packed between the radiator, hydraulic oil cooler, and charge-air cooler. Test the engine under load to ensure it does not lose power or overheat. Check for fault codes related to the electronic control system and verify the condition of the undercarriage, including track tension and roller wear. Ensure the machine has been maintained with Komatsu EO or TO hydraulic oil and approved engine lubricants.
How does the SA6D140-1L engine compare to Cummins L10 engines in terms of maintenance and reliability?
The SA6D140-1L is generally preferred over the Cummins L10 for long-term reliability in Komatsu applications. The L10 used soft liners and a PT fuel system with lower injection pressure (around 2,100 PSI), which was prone to piston ring issues at lower hour counts. In contrast, the SA6D140-1L features hardened liners, high-alloy rings, and a Bosch-style fuel system with injection pressures around 3,200 PSI. This design makes the SA6D140-1L more durable and less prone to the 'slobbering' piston ring problems seen in some Cummins units. Operators rarely trade Komatsu engines for Cummins units due to this reliability difference.
What safety-critical fixes are associated with the SA6D140-1L engine cooling and hydraulic systems?
Safety-critical issues include engine overheating and hydraulic system failure. If the engine overheats, check the coolant level, fan operation, and clean the cooling package. A machine that expels coolant or becomes highly pressurized after a cold start may have deeper engine issues. For hydraulic systems, if all functions are slow, check the hydraulic oil level, filter condition, and engine RPM. If the machine derates suddenly, check for engine or aftertreatment warnings. Have your dealer verify the exact serial range specifications and installed attachment package, as these can affect weight, reach, and fuel use. Always consult official OEM service manuals for precise operating specs and safety protocols.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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