Komatsuengine(no series)
Komatsu SAA6D170E-3B-8(S/N 310001-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu SAA6D170E-3B-8 is a 6-cylinder, turbo-charged, after-cooled diesel engine designed for heavy-duty construction and mining applications. It powers the PC1250-7 and PC1250LC-7 crawler excavators, as well as the WA600-3 and WA600-3LK wheel loaders. The engine delivers approximately 533 kW (715 hp) and is characterized by a robust cast-iron block and Komatsu variable geometry turbocharging. Production years for the associated PC1250-7 series span the mid-2000s to early 2010s, serving as a predecessor to the PC1250-8 series which utilizes the SAA6D170E-5 engine. The SAA6D170E-3B-8 configuration is specifically identified for serial numbers 310001 and up.
Across the SAA6D170E series generations, the primary changes involve emissions compliance upgrades and electronic control system refinements. The transition from the E-3 to the E-5 series introduced stricter Tier 4 Final/Stage IIIA emissions packages, altering fuel injection timing and exhaust aftertreatment requirements. The SAA6D170E-3B-8 remains critical in the used and parts market because the PC1250-7 and WA600-3 platforms are widely deployed in high-hour mining and quarry operations. Its mechanical simplicity compared to newer electronic-heavy engines makes it a preferred candidate for rebuild, while the shared component architecture with the SAA6D170E-5 allows for parts interchangeability in specific applications, sustaining a robust aftermarket supply chain.
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 SAA6D170E-3B-8(S/N 310001-UP) specifications
Engine
| Model | SAA6D170E-3B-8 |
| Series/Generation | 170-3 Series |
| Cylinders | 6 |
| Displacement | 16.86 L (918.8 cu in) |
| Bore x Stroke | 170 mm x 170 mm (6.69 in x 6.69 in) |
| Aspiration | Turbocharged, after-cooled, cooled EGR |
| Emissions Tier | EU Stage II / Tier 2 |
| Power (Gross/Net) | 550–700 hp (410–522 kW); specific net power varies by application (e.g., 455 kW @ 1800 rpm for D375, 394 kW @ 1800 rpm for WA600, 568 kW @ 2000 rpm for WA700) |
Weights
| Engine Weight | Approx. 1,700 kg (3,748 lb) |
Dimensions
| Note | Machine transport dimensions (length/width/height) are not documented for the engine component itself in the provided sources. |
Performance
| Note | Machine performance figures (travel speed, gradeability, lift/dig capacity) are not documented for the engine component in the provided sources. |
Service capacities (summary)
| Note | Fluid capacities (fuel, hydraulic, oil, cooling) are not documented for the engine component in the provided sources. |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
Komatsu SAA6D170E-3B-8(S/N 310001-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 SAA6D170E-3B-8(S/N 310001-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize Komatsu Oil Wear Analysis (KOWA) at every 500-hour interval to monitor engine wear metals and contaminants. Track iron, copper, and lead levels in the engine oil to detect early bearing or cylinder liner wear. Monitor hydraulic fluid for ISO cleanliness and water content to protect the main pump and control valves. Coolant analysis must verify SCA concentration and pH levels to prevent scaling and corrosion within the SAA6D170E-3B-8 cooling passages. KOMTRAX telematics data should be reviewed to identify load frequency and fuel burn anomalies that precede mechanical failure.
Corrective & Common Repairs
Address intermittent starting and random shutdowns by inspecting the engine controller power supply and EPC system circuits. Common failures include clogged fuel filters causing power loss and air filter restriction leading to turbocharger strain. Replace worn turbocharger seals if excessive blowby or oil consumption is detected. Inspect the injection pump and injector lines for leaks that disrupt fuel pressure. Verify the integrity of the wiring harness connectors to prevent fault codes related to engine speed sensors and temperature monitoring.
Overhaul & Rebuild Points
Plan inframe overhauls based on KOWA results and compression testing. Key wear points include piston rings, cylinder liners, and main bearings. When rebuilding the SAA6D170E-3B-8, inspect the crankshaft for journal wear and replace the turbocharger if blade damage is evident. Verify the condition of the oil cooler core, which is prone to clogging in dusty environments. Ensure all gaskets and seals are replaced during reassembly to maintain proper compression and prevent coolant leakage into the crankcase.
Seasonal & Environment Servicing
In high-dust environments, service the air filter more frequently and monitor the restriction indicator closely to prevent turbocharger damage. In cold climates, ensure the coolant mixture provides adequate freeze protection and use the correct viscosity engine oil for cold starts. In high-temperature operations, clean the radiator and oil cooler fins daily to prevent overheating. Check the DEF system for crystallization in cold weather and ensure the fuel water separator is drained regularly to prevent microbial growth in the tank.
SAA6D170E-3B-8(S/N 310001-UP) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 07281-00197 | Clamp,(With Pre-Fuel Filter) | Fuel system service | Check fitment → |
| 600-185-6100 | Element Assembly, Air Cleaner | Air intake service | Check fitment → |
| 600-211-1231 | Cartridge, Oil Filter | Lubrication service | Check fitment → |
| 6560-41-7110 | Filter | Scheduled service item | Check fitment → |
| 6560-81-5110 | Screen,Filter | Scheduled service item | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
SAA6D170E-3B-8(S/N 310001-UP) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| CA115 | Engine speed sensor and backup speed sensor failure | Faulty crankshaft speed sensor, damaged wiring harness, or corroded connector at the sensor pin. | Inspect the sensor wiring for chafing or damage. Test sensor voltage at the connector. Replace the engine speed sensor if voltage is out of specification. |
| CA441 | Battery voltage is too low | Weak or discharged battery, loose battery cables, or failing alternator charging system. | Check battery terminal tightness and corrosion. Test battery voltage and alternator output. Replace battery or alternator as needed. |
| CA451 | Common rail pressure sensor feedback value is too high | Faulty high-pressure fuel rail sensor, shorted sensor wiring, or actual overpressure condition in the fuel system. | Inspect the rail pressure sensor wiring for shorts. Verify sensor signal voltage. If wiring is intact, replace the pressure sensor. |
| CA122 | Intake air pressure sensor feedback voltage is too high | Faulty intake manifold pressure sensor, open sensor circuit, or sensor power supply issue. | Check the sensor connector for corrosion or loose pins. Test the 5V sensor supply voltage. Replace the intake pressure sensor if the circuit is good. |
| CA144 | Coolant temperature sensor feedback voltage is too high | Faulty engine coolant temperature sensor, open circuit in the sensor wiring, or poor ground connection. | Inspect the coolant temperature sensor wiring harness. Check sensor resistance at operating temperature. Replace the sensor if the circuit is intact. |
| CA234 | Engine overspeed | Faulty governor, stuck throttle linkage, or malfunctioning electronic control module (ECM) limiting fuel delivery. | Check the throttle linkage for binding. Verify ECM fuel limit commands. Inspect the governor mechanism and speed sensor signals. |
| AA10NX | Air filter clogging | Dirty or blocked air cleaner element, indicating restricted airflow to the engine. | Inspect the air filter indicator. Replace the air filter element if clogged. Check for intake restrictions. |
| B@BCNS | Engine coolant overheating | Low coolant level, failed water pump, clogged radiator, or faulty thermostat. | Check coolant level and condition. Inspect the radiator fins for debris. Verify fan operation and belt tension. Check for leaks. |
| CA322 | Injector #1 open or short circuit fault | Failed fuel injector, open or shorted injector wiring harness, or ECM driver circuit failure. | Check the injector connector for damage. Measure injector coil resistance. Swap injectors to isolate the fault. Replace the faulty injector. |
| E10 | Engine controller power failure or engine control drive system circuit malfunction | Blown fuse, broken ECM power supply wire, or internal ECM failure. | Check all ECM fuses and relays. Inspect the main power and ground wires to the ECM. Verify ECM power supply voltage. |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
SAA6D170E-3B-8(S/N 310001-UP) attachments & work tools
Wheel Loader Attachments
The WA600-3LK and WA700-3 series utilize the SAA6D170E-3B-8 engine (S/N 310001-UP) and support bucket capacities of 6.4–7.8 m³ (8.4–10.2 yd³) for the WA600 and 9.2 m³ (12.0 yd³) for the WA700. Coupler systems are standard for quick-attach bucket interchangeability.
Bulldozer Attachments
The D375A-5 series equipped with the SAA6D170E-3A-7 engine (S/N 310001-UP) is configured with dozer blade capacities ranging from 18.5 to 22.0 m³ (24.2 to 28.8 yd³). Factory guarding options include ROPS/FOPS cabs and engine compartment protection for mining environments.
Mining Dump Truck Bodies
The HD465-7 and HD605-7 rigid-frame trucks using the SAA6D170E-3B-8 engine (S/N 310001-UP) feature heaped body capacities of 34.2 m³ (44.7 yd³). These configurations are designed for heavy-duty quarry and aggregate hauling with reinforced body guarding.
Excavator Configurations
The PC1250-7 excavator series utilizes the SAA6D170E-3B-8 engine (S/N 310001-UP) and requires specific hydraulic kit arrangements for high-flow tool operation. Factory configurations include heavy-duty undercarriage and reinforced boom structures for mining applications.
All SAA6D170E-3B-8(S/N 310001-UP) assemblies by section
Every catalogued assembly group for the Komatsu SAA6D170E-3B-8(S/N 310001-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Engine
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Air Cleaner Mounting(#310535-)
| 01***35 | Bolt, Mount Ground Driven Steering Pump | 9 |
| 01***40 | Bolt,For Weight Adjusting Bolt | 10 |
| 01***80 | Bolt,For Weight Adjusting Bolt | 3 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Air Compressor Cover(#310005-)
| 01***20 | Bolt,(For Mono Lever Steering) | 6 |
| 62***60 | Plate | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Air Intake Manifold(#310005-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 1 |
| 01***30 | Bolt,(With Body Positioner) | 1 |
| 01***45 | Bolt, Mounting Cranking Motor | 4 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Air Vent(#310005-)
| 01***16 | Bolt - Starting Motor Ground Cable | 1 |
| 01***16 | Washer,Radio Controlled Slag Handling | 1 |
| 07***15 | Gasket,(Hd325?Pc750?800?1800) (A5010) | 12 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Alternator (75a) (Inner Parts)(#310005-)
| 60***30 | Alternator Assembly - 75 Amp | 1 |
| SD***X0 | Coil Assembly | 1 |
| SD***X0 | Washer | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Alternator Drive(#310005-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 8 |
| 62***80 | Pulley, Non-Hardening | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Alternator Mounting (75a)(#310005-)
| 01***20 | Bolt,(For Mono Lever Steering) | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 3 |
| 01***30 | Bolt,(With Body Positioner) | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Camfollower Cover(#310005-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***45 | Bolt,(With Water Separator Type) | 1 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Camshaft
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 2 |
| 04***28 | Key, Plain Woodruff | 1 |
| 04***12 | Ring, Snap (4) | 2 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Cooling Fan(#310005-)
| 01***40 | Bolt,For Weight Adjusting Bolt | 6 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 6 |
| 60***20 | Fan,(Tropical Spec.) | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Corrosion Resistor(#310005-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***45 | Bolt, Mounting Cranking Motor | 1 |
| 01***30 | Bolt,(Water Separator Spec.) | 4 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Crank Pulley(#310005-)
| 61***20 | Washer | 6 |
| 61***31 | Bolt | 6 |
| 62***52 | Pulley, Non-Hardening | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Crank Pulley(#310535-)
| 61***20 | Washer | 6 |
| 61***31 | Bolt | 6 |
| 62***10 | Pulley,Hardening | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Crankshaft
| 04***28 | Key, Plain Woodruff | 1 |
| 04***24 | Pin,Dowel (For No.3 Housing) | 1 |
| 61***50 | Thrust Bearing Assembly | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Cylinder Block
| 01***16 | Bolt, Mount Solenoid Valve | 12 |
| 01***60 | Washer,(Without Rops Guard? Canopy) | 14 |
| 04***14 | Pin, Dowel | 2 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Cylinder Block Blind Cover(#310005-)
| 01***20 | Bolt, Wiring Harness Mounting Bracket | 6 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***30 | Bolt,(With Body Positioner) | 3 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Cylinder Block Gasket Kit(#310005-)
| 07***25 | O-Ring,Corrosion Resistor | 1 |
| 07***95 | O-Ring,Transmission Strainer | 1 |
| 07***35 | O-Ring,(F4320-68a0 -11 ) | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Cylinder Head
| 01***70 | Bolt | 12 |
| 04***20 | Pin,Dowel (Welded) | 2 |
| 07***38 | 0-Ring - Torque Converter Totransmission | 2 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Cylinder Head Gasket Kit(#310005-)
| 07***12 | O-Ring,(F4350-59a1 -17 ) | 6 |
| 07***38 | 0-Ring - Torque Converter Totransmission | 12 |
| 07***39 | O-Ring,(Fig.A5010) | 2 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Damper(#310005-)
| 01***25 | Bolt | 12 |
| 04***24 | Pin,Dowel (For No.3 Housing) | 1 |
| 62***00 | Damper Assembly, Vibration | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Engine Mounting(#310535-)
| 01***45 | Bolt, Mounting Cranking Motor | 2 |
| 01***05 | Capscrew | 11 |
| 01***50 | Bolt | 8 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Engine Name Plate (English)(#310005-)
| 04***50 | Screw | 4 |
| 09***35 | Plate? Name,(Limited Supply) | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Exhaust Manifold(#310005-)
| 01***90 | Bolt | 24 |
| 61***90 | Spacer | 24 |
| 61***71 | Plug | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Fan Belt(#310005-)
| 04***75 | V-Belt Set,Reversible | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Fan Drive(#310005-)
| 01***50 | Bolt,For Weight Adjusting Bolt | 6 |
| 01***25 | Capscrew | 1 |
| 01***32 | Washer,(With Auto Emergency Steering) | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Fan Pulley(#310535-)
| 01***45 | Bolt, Mounting Cranking Motor | 6 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 6 |
| 62***50 | Pulley,Hardening | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Flywheel Housing(#310535-)
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Flywheel(#310005-)
| 61***40 | Washer | 10 |
| 62***00 | Flywheel Ass'Y | 1 |
| 62***50 | Bolt | 10 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Flywheel(#310535-)
| 61***40 | Washer | 10 |
| 62***20 | Flywheel Ass'Y | 1 |
| 62***60 | Bolt | 10 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Front Cover Mounting(#310005-)
| 01***65 | Bolt,(Used With Pin Puller) | 1 |
| 01***75 | Bolt - Tube Mounting | 5 |
| 09***50 | Liquid Gasket, Lg-7, 150g | 0 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Front Cover(#310005-)
| 61***20 | Seal,(Fig.A2040) | 1 |
| 62***70 | Seal? Front,(Fig.A2040) | 1 |
| 62***20 | Cover | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Fuel Control Valve (For Refulation Of Epa) (For Eu Exhaust Gas Regulation)(#310510-)
| 01***85 | Bolt, Divider Valve Mounting | 2 |
| 01***10 | Bolt,(With Joy Stick Steering) | 2 |
| 01***55 | Bolt, Mount Dryer To Bracket And Frame | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Fuel Control Valve (For Regulation Of Epa) (For Eu Exhaust Gas Regulation) (Inner Parts)(#310510-)
| 62***20 | Seal, O-Ring | 2 |
| 62***20 | Seal, O-Ring | 1 |
| 62***40 | Sensor, Coolant Temperature Assembly | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Fuel Control Valve (Inner Parts)(#310005-310163)
| 62***20 | Seal, O-Ring | 2 |
| 62***20 | Seal, O-Ring | 1 |
| 62***40 | Sensor, Coolant Temperature Assembly | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Fuel Control Valve (Inner Parts)(#310164-310509)
| 62***20 | Seal, O-Ring | 2 |
| 62***20 | Seal, O-Ring | 1 |
| 62***40 | Sensor, Coolant Temperature Assembly | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Fuel Control Valve (Inner Parts)(#310510-)
| 62***20 | Seal, O-Ring | 2 |
| 62***20 | Seal, O-Ring | 1 |
| 62***40 | Sensor, Coolant Temperature Assembly | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Fuel Control Valve(#310005-310163)
| 01***85 | Bolt, Divider Valve Mounting | 2 |
| 01***05 | Capscrew | 2 |
| 01***10 | Bolt,(With Joy Stick Steering) | 2 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Fuel Control Valve(#310164-310509)
| 01***85 | Bolt, Divider Valve Mounting | 2 |
| 01***10 | Bolt,(With Joy Stick Steering) | 2 |
| 01***55 | Bolt, Mount Dryer To Bracket And Frame | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Fuel Control Valve(#310510-)
| 01***85 | Bolt, Divider Valve Mounting | 2 |
| 01***10 | Bolt,(With Joy Stick Steering) | 2 |
| 01***55 | Bolt, Mount Dryer To Bracket And Frame | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Fuel Filter Mounting(#310005-)
| 01***00 | Bolt,For Weight Adjusting Bolt | 3 |
| 01***55 | Bolt, Mount Dryer To Bracket And Frame | 1 |
| 01***90 | Bolt,(For Large Fan) | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Fuel Filter Mounting(#310448-)
| 01***00 | Bolt,For Weight Adjusting Bolt | 3 |
| 01***65 | Bolt - Transmission Tube Mounting | 1 |
| 01***45 | Screw | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Fuel Injection Pump (Inner Parts)
| 62***20 | Plug, Threaded (M22-1.50) | 1 |
| 62***60 | Seal, O-Ring | 1 |
| 62***50 | Plug, Threaded (7/8-14 Unf) | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Fuel Injection Pump (Inner Parts)(#310448-)
| 62***20 | Plug, Threaded (M22-1.50) | 1 |
| 62***60 | Seal, O-Ring | 1 |
| 62***50 | Plug, Threaded (7/8-14 Unf) | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Fuel Injection Pump Drive(#310001-310046)
| 01***30 | Bolt,(Not Used When Towing Winch) | 2 |
| 01***30 | Bolt,For Weight Adjusting Bolt | 2 |
| 04***30 | Ring, Snap | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Fuel Injection Pump Drive(#310047-)
| 01***30 | Bolt,(Not Used When Towing Winch) | 2 |
| 01***30 | Bolt,For Weight Adjusting Bolt | 2 |
| 04***30 | Ring, Snap | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Fuel Injection Pump Mounting
| 01***15 | Bolt | 1 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 5 |
| 01***75 | Bolt (M10-1.50x75) | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Fuel Injection Pump Mounting(#310448-)
| 01***15 | Bolt | 1 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 5 |
| 01***75 | Bolt (M10-1.50x75) | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Fuel Injection Pump Repair Kit
| 65***40 | Kit,Front Cover | 1 |
| 65***60 | Kit,Accessory | 1 |
| 65***70 | Kit,Gear Housing | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Fuel Injection Pump Repair Kit(#310448-)
| 65***40 | Kit,Front Cover | 1 |
| 65***60 | Kit,Accessory | 1 |
| 65***70 | Kit,Gear Housing | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Fuel Injector(#310005-)
| 01***32 | Washer, (Without Emergency Steering) | 6 |
| 62***50 | Bolt | 6 |
| 65***11 | Injector | 6 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Fuel Return(#310012-)
| 01***85 | Bolt,(For Reversible Fan) | 1 |
| 07***12 | Washer, Gasket,(F5350-64a0 -24 ) | 4 |
| 07***20 | Bolt,Joint | 2 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Head Cover Related Parts
| 01***45 | Bolt, Bracket Mounting | 36 |
| 01***16 | Washer,Radio Controlled Slag Handling | 36 |
| 61***20 | Rubber,(Fig.A1111) | 36 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Heater Switch(#310005-)
| 01***30 | Bolt,(With Body Positioner) | 1 |
| 01***55 | Bolt,(See Service News) | 2 |
| 01***12 | Bolt,(With Speedometer) | 4 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Idler Gear
| 01***30 | Bolt | 6 |
| 01***80 | Bolt | 2 |
| 04***24 | Pin,Dowel (For No.3 Housing) | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Injection Bracket And Piping
| 01***45 | Bolt, Bracket Mounting | 2 |
| 01***60 | Bolt - Upper Cooler Inlet Tubemounting | 1 |
| 01***70 | Screw | 2 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Muffler(#310005-)
| 01***20 | Bolt,(For Mono Lever Steering) | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 3 |
| 01***35 | Bolt,(F4320-52a0 -5 ) | 5 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Oil Cooler
| 01***25 | Bolt - Relay Mounting | 4 |
| 07***42 | O-Ring - Torque Converter Totransmission | 2 |
| 07***12 | Plug,(For Heater-Less) | 2 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Oil Cooler Mounting(#310005-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 22 |
| 01***30 | Bolt,(With Body Positioner) | 4 |
| 01***65 | Bolt - Return Line And Suction Linehose Clamps | 4 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Oil Filler(#310005-)
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 3 |
| 01***30 | Bolt - Lower Oil Cooler Outlet Tubemounting | 1 |
| 07***00 | Cap,Oil Filler | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Oil Filter
| 01***30 | Bolt,(With Body Positioner) | 8 |
| 01***16 | Washer,Radio Controlled Slag Handling | 8 |
| 07***12 | Plug,(For Shipping) (Not Shown) | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Oil Level Gauge(#310005-)
| 61***10 | Bushing, Oil Gauge Guide | 1 |
| 61***20 | Collar | 1 |
| 61***30 | Nut,(For Shipping) | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Oil Pan And Suction Tube(#310005-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***30 | Bolt,(With Body Positioner) | 4 |
| 01***35 | Bolt,(F4320-52a0 -5 ) | 49 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Oil Pump
| 01***30 | Bolt,(With Body Positioner) | 2 |
| 01***40 | Bolt (Op) | 2 |
| 01***30 | Bolt,(Water Separator Spec.) | 6 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Piston
| 02***13 | Pin, Dowel | 4 |
| 61***20 | Ring, Snap | 12 |
| 61***41 | Bearing Assembly, Standard | 6 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Rear Power Take Off(#310005-)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 3 |
| 01***30 | Bolt,For Weight Adjusting Bolt | 1 |
| 62***80 | Plate | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Rocker Arm And Housing
| 01***20 | Bolt (M12-1.75x120) | 60 |
| 01***15 | Nut | 1 |
| 07***12 | O-Ring,(F4350-59a1 -17 ) | 6 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Rocker Arm Housing Cover
| 62***10 | Cover, Head | 6 |
| 62***10 | Gasket,Head Cover (K1) | 6 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Starting Motor (7.5kw) (Inner Parts)(#310005-310524)
| 60***21 | Starting Motor Ass'Y,(7.5kw) | 1 |
| KD***20 | Magnetic Switch Assembly | 1 |
| KD***40 | Spring,Spring | 4 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Starting Motor Mounitng (7.5kw)(#310005-)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 2 |
| 01***45 | Bolt,(For 60ton Dump Body) | 6 |
| 01***10 | Nut,(Dust?Drip Proof? Trimming S.) | 2 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Tension Pulley(#310005-)
| 01***20 | Bolt, Wiring Harness Mounting Bracket | 2 |
| 01***40 | Bolt,For Weight Adjusting Bolt | 8 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 2 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Thermostat Housing(#310005-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***95 | Capscrew | 6 |
| 07***08 | Plug,See Fig. K4010-63a0 | 2 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Turbocharger (Ktr110l-997a) (Inner Parts)(#310005-)
| 01***16 | Bolt | 4 |
| 01***16 | Bolt | 8 |
| 04***08 | Pin, Dowel | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Turbocharger Mounting(#310005-)
| 61***90 | Nut, Mounting | 4 |
| 61***30 | Stud | 4 |
| 61***10 | Gasket,Turbocharger Mounting | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Turbocharger Oil Piping(#310005-)
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 1 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 4 |
| 01***30 | Bolt - Lower Oil Cooler Outlet Tubemounting | 3 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Water Pump Gasket Kit(#310005-)
| 07***95 | O-Ring,Transmission Strainer | 1 |
| 07***12 | O-Ring,(Fig.A5010) | 1 |
| 07***40 | O-Ring,(Fig.A5010) | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Water Pump(#310005-)
| 01***12 | Bolt - M8 - 1.25 X 12 | 1 |
| 01***30 | Bolt,(With Body Positioner) | 4 |
| 01***15 | Bolt | 4 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Water Temperature Sensor(#310005-)
| 07***16 | Plug | 1 |
| 08***10 | Connector, Clip | 1 |
| 78***20 | Sensor, Trans. Control Valve Oil Temperature | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Wiring (1/3) (Fuel Control)(#310005-)
| 01***20 | Bolt,(For Mono Lever Steering) | 3 |
| 01***30 | Bolt,(With Body Positioner) | 1 |
| 01***65 | Bolt - Return Line And Suction Linehose Clamps | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Wiring (1/3) (Fuel Control)(#310535-)
| 01***20 | Bolt,(For Mono Lever Steering) | 3 |
| 01***30 | Bolt,(With Body Positioner) | 1 |
| 01***65 | Bolt - Return Line And Suction Linehose Clamps | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Wiring (2/3) (Switch And Sensor)(#310005-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 1 |
| 01***40 | Bolt,For Weight Adjusting Bolt | 2 |
| 01***00 | Bolt,(For Front Brake Release) | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Wiring (2/3) (Switch And Sensor)(#310535-)
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 1 |
| 01***30 | Bolt,(Not Used When Towing Winch) | 1 |
| 01***00 | Bolt,(For Front Brake Release) | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Wiring (3/3) (Controller Cover)(#310005-)
| 01***16 | Bolt - Starting Motor Ground Cable | 3 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 3 |
| 01***25 | Screw | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Wiring (3/3) (Controller Cover)(#310535-)
| 01***16 | Bolt - Starting Motor Ground Cable | 3 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 3 |
| 01***25 | Screw | 1 |
Komatsu : Saa6d170e-3b-8(S/N 310001-Up) : Engine : Wiring(#310005-)
| 62***11 | Harness, Wiring | 1 |
| 62***20 | Wire Harness | 1 |
| 62***21 | Wire Harness | 1 |
SAA6D170E-3B-8(S/N 310001-UP) serial number reference
The 3-character PIN prefix is located on the 17-character ISO PIN plate riveted to the right-hand side of the cab lower frame or on the emissions/export plate near the engine bay. The first three characters of this 17-character code identify the specific machine configuration and serial range.
| Prefix | Identifies | Notes |
|---|---|---|
| J | PC1250SP-8R | Serial range J10001-UP; engine SAA6D170E-3B-8 |
| A | WA600-3LK | Serial range A53001-UP; engine SAA6D170E-3B-8 |
Frequently asked questions
What engine does the Komatsu PC1250-7 use?
The Komatsu PC1250-7 and PC1250LC-7 excavators use the Komatsu SAA6D170E-3 series engine. Specifically, the SAA6D170E-3B-8 variant is used for serial numbers 310001 and up.
What is the operating weight of the Komatsu PC1250-7?
The operating weight of the Komatsu PC1250-7 varies by configuration, typically ranging from approximately 120,000 kg to 130,000 kg depending on the boom, stick, and counterweight setup.
What replaced the Komatsu PC1250-7?
The Komatsu PC1250-7 was succeeded by the PC1250-8 series. The PC1250-8 utilizes the upgraded SAA6D170E-5 engine, which features enhanced emissions compliance and improved electronic engine management systems.
What SAA6D170E-3B-8(S/N 310001-UP) owners discuss
What are the known powertrain and hydraulic behaviors for machines using the SAA6D170E-3B-8 engine?
The engine is paired with Komatsu’s hydraulic system, which is generally described as smooth and fuel-efficient. A common diagnostic pattern involves distinguishing between engine power loss and hydraulic weakness. If the engine RPM drops heavily when hydraulics are used, the hydraulic system may be placing excessive load on the engine. If engine speed remains normal but movements become weak, the hydraulic system is the primary suspect. All functions slowing down simultaneously points to shared supply, pump control, or engine performance issues rather than individual cylinder failure. Hydraulics that work cold but weaken when hot indicate internal leakage that increases as oil viscosity decreases, requiring pressure and flow testing at operating temperature rather than assuming pump failure based on temperature alone. (Source: Heavy Machinery Club diagnostic guides; Komatsu WA700/WA600 specs noting smooth operation and fuel efficiency.)
What undercarriage or wear patterns are typical for this machine type?
Komatsu excavators and dozers utilizing this engine class are engineered for durability but are subject to wear from continuous load, dust exposure, and temperature extremes. Common wear patterns include track tension issues causing repeated loosening, which requires regular inspection of the adjuster and components. Undercarriage wear is accelerated by mud or debris packed into the track system. The machine’s design aims for long-term reliability, but heavy production work increases exposure to undercarriage component fatigue. (Source: Heavy Machinery Club troubleshooting; Komatsu D375/WA700 specs noting durable undercarriage systems.)
What are the engine quirks per the SAA6D170E-3B-8 series?
The SAA6D170E-3B-8 is a 6-cylinder, liquid-cooled, turbocharged, after-cooled diesel engine with cooled EGR. It features a bore and stroke of 170 mm (6.69 in) each, with a total displacement of 16.86 liters (1,029 cu in). The engine is designed to meet EU Stage II and Tier 2 emissions standards. It is known for robust performance in heavy-duty applications, but like other Komatsu engines in this family, it requires careful monitoring of the cooling package. The engine’s power output varies by application, ranging from 550 to 700 hp depending on the specific machine configuration (e.g., WA700 loader vs. D375 dozer). (Source: Komatsu WA700/WA600/D375 specs; Komatsu SAA6D170 diesel engine technical data.)
What are common electrical or sensor issues reported by owners?
Komatsu machines rely heavily on electronic control systems, meaning a single faulty sensor or unstable power supply can trigger multiple warning signals. Owners often report intermittent starting, dashboard failures, or machines that randomly shut down. These issues are frequently linked to battery state, engine/chassis grounds, or connector integrity rather than immediate engine failure. Multiple fault codes often point to battery or ground issues first. (Source: Heavy Machinery Club common problems; Komatsu PC200-8/PC200-7 diagnostic notes.)
What should be checked when buying a used machine with the SAA6D170E-3B-8 engine?
Verify the exact serial number prefix to confirm the engine variant, as the SAA6D170E-3B-8 (S/N 310001-UP) is distinct from earlier SAA6D170E-2A-8 (S/N 17001-UP) or later SAA6D170E-5 variants. Check the cooling package (radiator, hydraulic oil cooler, charge-air cooler) for packed debris between heat exchangers, as this is a common cause of overheating. Inspect the hydraulic oil condition and level, as degraded oil or incorrect specification can cause weak performance when hot. Test the engine under load to ensure it does not lose power when combining boom, arm, and bucket movements. Check for signs of gray market import, which can complicate parts availability. (Source: Komatsu serial number guides; Heavy Machinery Club buying tips; Komatsu WA700/WA600 specs.)
What are the critical fluid specifications for this engine?
Use Komatsu Genuine Diesel Engine Oil (EO, TO, or AXO specifications) and Komatsu Super Coolant AF-NAC. Hydraulic oil must meet Komatsu Engineering Standards. The engine weight is approximately 1,700 kg (3,748 lb). (Source: Komatsu Lubricants guide; Komatsu SAA6D170 diesel engine specs.)
What safety-critical fix requires dealer verification?
ECM calibration and fault code diagnosis for the SAA6D170E-3B-8 engine require specialized Komatsu diagnostic software and calibration files. Attempting to bypass safety interlocks or modify engine control parameters without proper tools and verification can lead to unsafe operation. Have your dealer verify any ECM-related repairs or calibrations. (Source: Komatsu WA380-8 no-start forum discussions; Komatsu PC200-7/PC200-8 diagnostic notes.)
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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