Komatsuengine(no series)
Komatsu SAA6D170E-3C-8(S/N 310001-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu SAA6D170E-3C-8 engine is a heavy-duty, six-cylinder, turbocharged, and aftercooled diesel powerplant designed for large-scale earthmoving equipment. It powers the PC1250-7 series crawler excavators and the WA600-3 series wheel loaders, machines in the 125-ton and 55-ton class respectively. Production for this specific serial range (310001-UP) spans the mid-2000s to early 2010s, serving as the successor to the SAA6D170E-2A-8 and predecessor to the SAA6D170E-5 series. Configurations vary by application, with distinct tuning for the high-torque demands of mining dump trucks like the HD465-7 and the hydraulic flow requirements of wheel loaders.
Across generations, the SAA6D170E-3C-8 introduced variable geometry turbocharging and cooled EGR to meet Tier 2/Stage II emissions standards, a significant shift from the naturally aspirated predecessors. This engine remains critical in the used and parts market because it serves as the heart of massive, high-value machines that are still active in heavy mining and infrastructure projects. Its robust architecture and widespread use in the PC1250 and WA600 families ensure a steady demand for rebuild kits, undercarriage components, and hydraulic parts, making it a staple for fleet maintenance and independent rebuilders.
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-3C-8(S/N 310001-UP) specifications
Engine
| Model | SAA6D170E-3C-8 |
| Series | 170-3 Series |
| Cylinders | 6 |
| Bore | 170 mm (6.69 in) |
| Stroke | 170 mm (6.69 in) |
| Displacement | 16.86 L (1413 in³) |
| Aspiration | Turbocharged, after-cooled, cooled EGR |
| Cooling | Liquid cooling |
| Emissions Tier | Tier 2 / EU Stage II |
Weights
| Engine Weight | Approx. 1,700 kg (3,748 lb) |
Dimensions
| Engine Dimensions (L x W x H) | 2250 x 1600 x 1850 mm (88.6 x 63.0 x 72.8 in) |
Performance
| Power Output Range | 550 to 700 hp (410 to 522 kW) varies by configuration/series |
Service capacities (summary)
| Engine Oil | Komatsu EO or equivalent SAE 10W-30 |
| Coolant | Super-coolant AF-NAC |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
Komatsu SAA6D170E-3C-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-3C-8(S/N 310001-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize the KOWA (Komatsu Oil Wear Analysis) program at every 500-hour interval to monitor engine oil, hydraulic fluid, and coolant health. Sample results detect wear metals like iron or copper and identify contaminants such as silicon or sodium. Regular analysis of the 80-liter engine oil and 122-liter hydraulic fluid helps prevent particulate contamination. Monitor coolant pH and SCA concentration to avoid corrosion in the SAA6D170E-3C-8 cooling passages. Early detection of abnormal exhaust color or sound can prevent catastrophic engine failure in this high-displacement unit.
Corrective & Common Repairs
Address common SAA6D170E-3C-8 issues by inspecting the variable geometry turbocharger vanes for carbon buildup and sticking. Check the EGR cooler for leaks that may cause coolant loss or oil contamination. Replace worn injector O-rings and check injector nozzle spray patterns if power loss or black smoke occurs. Inspect the oil cooler core for blockage, which is critical for this engine's thermal management. Verify the integrity of the turbocharger housing and intercooler piping for cracks or loose clamps that reduce boost pressure.
Overhaul & Rebuild Points
Plan inframe overhauls for the SAA6D170E-3C-8 around 10,000 to 15,000 hours, depending on load factors. Key rebuild points include replacing piston rings, cylinder liners, and valve guides. Inspect the crankshaft for journal wear and the connecting rods for stretch. During chassis rebuild, verify the integrity of the frame casting and check all mounting bolts for proper torque. Evaluate engine component condition if significant power loss is detected, ensuring all clearances meet factory specifications for the 170-3 series.
Seasonal & Environment Servicing
In cold climates, ensure the coolant mixture meets required freeze protection and use low-temperature grade engine oil to aid cold starts. In dusty environments, inspect the air filter restriction indicator more frequently and clean radiator and oil cooler fins daily to prevent overheating. For high-altitude operation, verify that the turbocharger is functioning correctly to maintain boost pressure. Check the DEF system for crystallization in cold weather and ensure the fuel water separator is drained regularly to prevent ice formation in the lines.
SAA6D170E-3C-8(S/N 310001-UP) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 6217-71-6470 | Plate? Caution,Fuel Filter | Fuel system service | Check fitment → |
| 6217-71-6480 | Plate,Fuel Filter | Fuel system service | Check fitment → |
| 6217-71-6510 | Plate,Fuel Filter | Fuel system service | Check fitment → |
| 07281-00197 | Clamp,(With Pre-Fuel Filter) | Fuel system service | Check fitment → |
| 600-185-6100 | Element Assembly, Air Cleaner | Air intake service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
SAA6D170E-3C-8(S/N 310001-UP) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| CA115 | Engine crankshaft speed sensor failure | Faulty speed sensor, broken wiring, or corroded connector at the pin connector | Replace the speed sensor and verify voltage at the pin connector |
| CA451 | Common rail pressure sensor feedback value too high | Malfunction in the rail pressure sensor or actual overpressure condition | Diagnose the fuel rail pressure sensor or check pump lines |
| CA122 | Intake air pressure sensor feedback voltage too high | Faulty intake pressure sensor or wiring issue | Verify the intake pressure sensor and wiring |
| CA144 | Coolant temperature sensor feedback voltage too high | Faulty coolant temperature sensor | Replace or test the coolant temperature sensor |
| CA441 | Battery voltage too low | Weak battery or failing alternator | Replace the alternator or battery; check the voltage regulator |
| CA234 | Engine overspeed | Throttle calibration error, engine load cycle issue, or operator misuse | Verify throttle calibration and engine load cycle |
| CA111 | Internal engine controller fault | ECM internal abnormality | Replace or reprogram the ECM |
| AA10NX | Air cleaner clogging | Dirty or blocked air filter element | Replace the air filter |
| CA271 | IMV/PCV1 solenoid valve short circuit | Electrical short in the IMV solenoid valve circuit | Replace the IMV solenoid or inspect the wire harness |
| CA689 | Engine speed sensor error | Faulty engine speed sensor or phase abnormality | Replace the corresponding sensor or inspect the sensor gap |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
SAA6D170E-3C-8(S/N 310001-UP) attachments & work tools
Wheel Loader Attachments
The WA600-3LK and WA700-3 series wheel loaders equipped with the SAA6D170E-3C-8 engine utilize bucket capacities ranging from 6.4 to 9.2 m³ (7 to 12 yd³). These machines support standard quick-coupler systems for rapid tool changes, with hydraulic line arrangements varying by specific loader configuration.
Excavator Attachments
The PC1250-7 and PC1250SP-7 excavator series use the SAA6D170E-3C-8 engine and are fitted with standard digging buckets and heavy-duty rock buckets. Factory guarding options include side cutters and tooth guards, with hydraulic kit requirements dependent on the specific attachment flow rates.
Dozer Attachments
The D375A-5 bulldozer series utilizes the SAA6D170E-3C-8 engine and is offered with standard straight blades and angle dozer blades. Blade capacities vary by configuration, and mounting systems require specific hydraulic line kits for angle and tilt functions.
Dump Truck Attachments
The HD465-7 and HD605-7 dump trucks equipped with this engine class use standard high-capacity dump bodies. Factory configurations include side-wall extensions and rock guards, with hydraulic arrangements tied to the truck's lift cylinder system.
All SAA6D170E-3C-8(S/N 310001-UP) assemblies by section
Every catalogued assembly group for the Komatsu SAA6D170E-3C-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-3c-8(S/N 310001-Up) : Engine : Air Cleaner Mounting(#310024-)
| 01***35 | Bolt, Mount Ground Driven Steering Pump | 21 |
| 01***40 | Bolt,For Weight Adjusting Bolt | 7 |
| 01***90 | Bolt | 4 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Air Compressor Cover(#310005-)
| 01***20 | Bolt,(For Mono Lever Steering) | 6 |
| 62***60 | Plate | 1 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Air Intake Manifold(#310024-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 1 |
| 01***30 | Bolt,(With Body Positioner) | 3 |
| 01***45 | Bolt, Mounting Cranking Motor | 4 |
Komatsu : Saa6d170e-3c-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-3c-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-3c-8(S/N 310001-Up) : Engine : Alternator Mounting (50a)(#310024-)
| 01***20 | Bolt,(For Mono Lever Steering) | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***30 | Bolt,(With Body Positioner) | 1 |
Komatsu : Saa6d170e-3c-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-3c-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-3c-8(S/N 310001-Up) : Engine : Caution Plate (English)(#310024-)
| 62***70 | Plate? Caution,Fuel Filter | 1 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Caution Plate (French)(#310024-)
| 62***90 | Decal, High Fuel Pressure | 1 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Caution Plate (German)(#310024-)
| 62***80 | Plate,Fuel Filter | 1 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Caution Plate (Spanish)(#310024-)
| 62***10 | Plate,Fuel Filter | 1 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Cooling Fan(#310024-)
| 01***40 | Bolt,For Weight Adjusting Bolt | 6 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 6 |
| 60***51 | Fan, Cooling | 1 |
Komatsu : Saa6d170e-3c-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-3c-8(S/N 310001-Up) : Engine : Crank Pulley (For Radiator Large Capcacity)(#310245-)
| 61***20 | Washer | 6 |
| 61***31 | Bolt | 6 |
| 62***10 | Pulley,Hardening | 1 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Crank Pulley(#310024-310447)
| 61***20 | Washer | 6 |
| 61***22 | Bolt | 6 |
| 62***40 | Pulley,Hardening | 1 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Crank Pulley(#310448-)
| 61***20 | Washer | 6 |
| 61***22 | Bolt | 6 |
| 62***30 | Pulley,Hardening | 1 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Crankshaft(#310021-)
| 04***28 | Key, Plain Woodruff | 1 |
| 04***24 | Pin,Dowel (For No.3 Housing) | 1 |
| 61***50 | Thrust Bearing Assembly | 1 |
Komatsu : Saa6d170e-3c-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-3c-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-3c-8(S/N 310001-Up) : Engine : Cylinder Block Gasket Kit(#310024-)
| 07***25 | O-Ring,Corrosion Resistor | 1 |
| 07***95 | O-Ring,Transmission Strainer | 1 |
| 07***35 | O-Ring,(F4320-68a0 -11 ) | 1 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Cylinder Block Mounting (Heater Spec.) (Cold Terrain Spec.)(#310472-)
| 01***25 | Bolt,(Rear Attachment Less) | 6 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***30 | Bolt,(With Body Positioner) | 3 |
Komatsu : Saa6d170e-3c-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-3c-8(S/N 310001-Up) : Engine : Cylinder Head Gasket Kit(#310024-)
| 02***81 | O-Ring,(Fig.A1310) | 2 |
| 07***12 | O-Ring,(F4350-59a1 -17 ) | 6 |
| 07***38 | 0-Ring - Torque Converter Totransmission | 12 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Damper(#310024-)
| 01***40 | Bolt (Op) | 12 |
| 01***32 | Washer,(With Auto Emergency Steering) | 12 |
| 62***20 | Pin,Dowel | 1 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Engine Mounting(#310024-)
| 01***45 | Bolt, Mounting Cranking Motor | 2 |
| 01***05 | Capscrew | 11 |
| 01***50 | Bolt | 8 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Exhaust Manifold(#310024-)
| 01***90 | Bolt | 24 |
| 61***90 | Spacer | 24 |
| 62***20 | Screw | 2 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Fan Belt (Ec? Dynamic Nise Suppression Spec.)(#310024-)
| 04***74 | V-Belt Set | 1 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Fan Belt(#310024-)
| 04***73 | V-Belt Set,Fan Drive | 1 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Fan Drive
| 01***35 | Bolt, Mount Ground Driven Steering Pump | 6 |
| 01***50 | Bolt,For Weight Adjusting Bolt | 6 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 12 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Fan Pulley (Ec? Dynamic Nise Suppression Spec.)(#310024-)
| 01***50 | Bolt,For Weight Adjusting Bolt | 6 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 6 |
| 62***40 | Pulley,Hardening | 1 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Fan Pulley(#310024-)
| 01***50 | Bolt,For Weight Adjusting Bolt | 6 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 6 |
| 62***60 | Pulley,Hardening | 1 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Flywheel Housing(#310024-)
| 01***20 | Bolt,(For Mono Lever Steering) | 1 |
| 01***30 | Bolt,(With Body Positioner) | 3 |
| 01***40 | Bolt,For Weight Adjusting Bolt | 1 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Flywheel(#310005-)
| 61***40 | Washer | 10 |
| 62***00 | Flywheel Ass'Y | 1 |
| 62***50 | Bolt | 10 |
Komatsu : Saa6d170e-3c-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-3c-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-3c-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-3c-8(S/N 310001-Up) : Engine : Fuel Control Valve (Inner Parts)(#310164-310447)
| 62***20 | Seal, O-Ring | 2 |
| 62***20 | Seal, O-Ring | 1 |
| 62***40 | Sensor, Coolant Temperature Assembly | 1 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Fuel Control Valve (Inner Parts)(#310448-)
| 62***20 | Seal, O-Ring | 2 |
| 62***20 | Seal, O-Ring | 1 |
| 62***40 | Sensor, Coolant Temperature Assembly | 1 |
Komatsu : Saa6d170e-3c-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-3c-8(S/N 310001-Up) : Engine : Fuel Control Valve(#310164-310447)
| 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-3c-8(S/N 310001-Up) : Engine : Fuel Control Valve(#310448-)
| 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-3c-8(S/N 310001-Up) : Engine : Fuel Filter Mounting(#310024-310447)
| 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-3c-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-3c-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-3c-8(S/N 310001-Up) : Engine : Fuel Injection Pump (Inner Parts)(#310024-310447)
| 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-3c-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-3c-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-3c-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-3c-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-3c-8(S/N 310001-Up) : Engine : Fuel Injection Pump Mounting(#310024-310447)
| 01***15 | Bolt | 1 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 5 |
| 01***75 | Bolt (M10-1.50x75) | 1 |
Komatsu : Saa6d170e-3c-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-3c-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-3c-8(S/N 310001-Up) : Engine : Fuel Injection Pump Repair Kit(#310024-310447)
| 65***40 | Kit,Front Cover | 1 |
| 65***60 | Kit,Accessory | 1 |
| 65***70 | Kit,Gear Housing | 1 |
Komatsu : Saa6d170e-3c-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-3c-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-3c-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-3c-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-3c-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-3c-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-3c-8(S/N 310001-Up) : Engine : Injection Bracket And Piping(#310024-)
| 01***45 | Bolt, Bracket Mounting | 2 |
| 01***60 | Bolt - Upper Cooler Inlet Tubemounting | 1 |
| 01***70 | Screw | 2 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Muffler(#310024-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***35 | Bolt,(F4320-52a0 -5 ) | 1 |
| 01***40 | Bolt (Op) | 4 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Name Plate And Caution Plate (For Regulation Of Epa) (For Eu Exhaust Gas Regulation)(#310024-)
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Name Plate And Caution Plate(#310024-)
| 04***50 | Screw | 4 |
| 60***40 | Plate? Name,(Limited Supply) | 1 |
| 60***40 | Plate? Name,Engine (Limited Supply) | 1 |
Komatsu : Saa6d170e-3c-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-3c-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-3c-8(S/N 310001-Up) : Engine : Oil Filler(#310024-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 3 |
| 01***30 | Bolt - Lower Oil Cooler Outlet Tubemounting | 1 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Oil Filter(#310024-)
| 01***85 | Bolt,(Used With Pin Puller) | 2 |
| 01***15 | Bolt | 4 |
| 01***30 | Bolt - Lower Oil Cooler Outlet Tubemounting | 5 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Oil Level Gauge (Cold Terrain Spec.)(#310448-310470)
| 61***10 | Bushing, Oil Gauge Guide | 1 |
| 61***20 | Collar | 1 |
| 61***30 | Nut,(For Shipping) | 1 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Oil Level Gauge (Cold Terrain Spec.)(#310471-)
| 61***10 | Bushing, Oil Gauge Guide | 1 |
| 61***20 | Collar | 1 |
| 61***30 | Nut,(For Shipping) | 1 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Oil Level Gauge(#310024-310470)
| 61***10 | Bushing, Oil Gauge Guide | 1 |
| 61***20 | Collar | 1 |
| 61***30 | Nut,(For Shipping) | 1 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Oil Level Gauge(#310471-)
| 61***10 | Bushing, Oil Gauge Guide | 1 |
| 61***20 | Collar | 1 |
| 61***30 | Nut,(For Shipping) | 1 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Oil Pan And Suction Tube (Cold Terrain Spec.)(#310448-310470)
| 01***20 | Bolt,(For Mono Lever Steering) | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 1 |
| 01***30 | Bolt,(With Body Positioner) | 4 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Oil Pan And Suction Tube (Cold Terrain Spec.)(#310471-)
| 01***20 | Bolt,(For Mono Lever Steering) | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 1 |
| 01***30 | Bolt,(With Body Positioner) | 4 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Oil Pan And Suction Tube(#310024-310470)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 1 |
| 01***30 | Bolt,(With Body Positioner) | 4 |
| 01***35 | Bolt,(F4320-52a0 -5 ) | 49 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Oil Pan And Suction Tube(#310471-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 1 |
| 01***30 | Bolt,(With Body Positioner) | 4 |
| 01***35 | Bolt,(F4320-52a0 -5 ) | 49 |
Komatsu : Saa6d170e-3c-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-3c-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-3c-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-3c-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-3c-8(S/N 310001-Up) : Engine : Rocker Arm Housing Cover
| 62***10 | Cover, Head | 6 |
| 62***10 | Gasket,Head Cover (K1) | 6 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Spare Parts (For Eu Exhaust Gas Regulation)(#310024-)
| 04***40 | Belt, Alternator | 1 |
| 04***74 | V-Belt Set | 1 |
| 60***31 | Cartridge, Oil Filter | 2 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Spare Parts(#310024-)
| 04***40 | Belt, Alternator | 1 |
| 04***73 | V-Belt Set,Fan Drive | 1 |
| 60***31 | Cartridge, Oil Filter | 2 |
Komatsu : Saa6d170e-3c-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-3c-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-3c-8(S/N 310001-Up) : Engine : Tension Pulley(#310024-)
| 01***20 | Bolt, Wiring Harness Mounting Bracket | 2 |
| 01***35 | Bolt, Mount Ground Driven Steering Pump | 2 |
| 01***50 | Bolt,For Weight Adjusting Bolt | 2 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Thermostat Housing(#310024-)
| 01***35 | Bolt,(F4320-52a0 -5 ) | 4 |
| 01***95 | Capscrew | 6 |
| 01***30 | Bolt,(Not Used When Towing Winch) | 2 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Turbocharger Mounting(#310024-)
| 01***10 | Bolt,(With Joy Stick Steering) | 1 |
| 01***16 | Bolt - Starting Motor Ground Cable | 1 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 3 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Water Pump Gasket Kit(#310024-)
| 07***95 | O-Ring,Transmission Strainer | 1 |
| 07***12 | O-Ring,(Fig.A5010) | 1 |
| 07***40 | O-Ring,(Fig.A5010) | 1 |
Komatsu : Saa6d170e-3c-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-3c-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-3c-8(S/N 310001-Up) : Engine : Wiring (1/3) (Fuel Control)(#310024-)
| 01***20 | Bolt,(For Mono Lever Steering) | 3 |
| 01***30 | Bolt,(With Body Positioner) | 1 |
| 01***50 | Bolt,(Spark Arrester Spec.) | 1 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Wiring (2/3) (Switch And Sensor)(#310024-)
| 01***05 | Capscrew | 1 |
| 01***08 | Screw | 4 |
| 01***16 | Bolt - Starting Motor Ground Cable | 2 |
Komatsu : Saa6d170e-3c-8(S/N 310001-Up) : Engine : Wiring (3/3) (Controller Cover)(#310024-)
| 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-3c-8(S/N 310001-Up) : Engine : Wiring(#310005-)
| 62***11 | Harness, Wiring | 1 |
| 62***20 | Wire Harness | 1 |
| 62***21 | Wire Harness | 1 |
SAA6D170E-3C-8(S/N 310001-UP) serial number reference
The PIN plate is typically riveted to the right-hand side of the cab on the lower frame, just behind the front idler or beneath the operator's window. Read the prefix from the engine model designation stamped on the plate or block, matching it to the serial number range (310001-UP) to identify the correct engine variant.
| Prefix | Identifies | Notes |
|---|---|---|
| SAA6D170E-3C-8 | Engine Model | Komatsu SAA6D170E-3C-8 engine. Serial range 310001-UP. Source: published references catalog listing and Equipment Guide PDF. Confirm with dealer for specific machine configuration. |
Frequently asked questions
What is the engine model for the Komatsu SAA6D170E-3C-8?
The engine model is the Komatsu SAA6D170E-3C-8, a six-cylinder, turbocharged, and aftercooled diesel engine used in the PC1250-7 and WA600-3 series.
What is the operating weight of the machines powered by this engine?
Operating weight varies by configuration and series. The PC1250-7 excavator weighs approximately 125,000 kg (275,578 lb), while the WA600-3 wheel loader weighs approximately 55,400-57,500 kg (122,135-126,766 lb).
What engine replaced the SAA6D170E-3C-8?
The SAA6D170E-5 series (including SAA6D170E-5A, SAA6D170E-5B, and SAA6D170E-5C) replaced the SAA6D170E-3C-8 to meet stricter Tier 4 Final/Stage V emissions standards.
What SAA6D170E-3C-8(S/N 310001-UP) owners discuss
What are the known powertrain and hydraulic behaviors for machines using the SAA6D170E-3C-8 engine?
The engine is paired with hydraulic systems that may exhibit weakness when hot due to decreased oil viscosity and internal leakage in pumps, valves, or motors. If all functions slow simultaneously, check hydraulic oil level, filter condition, and engine RPM. If only one function is slow, inspect the specific cylinder, control valve, or pilot input. The machine may also pull to one side during travel due to track tension differences or debris in the undercarriage rather than a hydraulic fault. The engine itself can lose power under heavy load if air filters, fuel filters, or charge-air hoses are restricted. Overheating is common in dusty environments if the radiator, hydraulic oil cooler, and charge-air cooler are packed with debris between the heat exchangers.
What undercarriage or wear patterns are typical for this machine type?
The undercarriage is subject to rapid wear in abrasive conditions. Track tension must be monitored regularly to prevent repeated loosening. Rollers and track chains wear unevenly if the machine frequently travels on hard surfaces or turns sharply. Mud or debris packed into the undercarriage increases resistance and accelerates component failure. The line is designed such that undercarriage wear often coincides with hydraulic pump wear, which can negatively impact resale value. Inspect track shoes for uneven wear and check final drive oil levels to prevent noise and failure.
What are the engine quirks per the SAA6D170E-3C-8 series?
The SAA6D170E-3C-8 is a 6-cylinder, 16.86-liter diesel engine with a bore and stroke of 170 mm (6.69 in) each. It uses a Komatsu variable geometry turbocharger, after-cooler, and cooled EGR system. The engine displacement is 1413 in³. It is liquid-cooled and weighs approximately 1,700 kg. The engine is used in large excavators like the PC1250-7 and wheel loaders like the WA600-3. The engine serial number range for this specific configuration starts at 310001. The engine is known for robust performance in heavy-duty applications but requires strict adherence to cooling system maintenance to prevent overheating during continuous load. Have your dealer verify the exact emissions tier and calibration for the specific machine model.
What are common electrical or sensor issues reported by owners?
Komatsu machines rely heavily on electronic control systems. A single faulty sensor or unstable power supply can trigger multiple warning signals. Owners report intermittent starting, dashboard failures, or random shutdowns. If the engine cranks but does not start, check the battery state of charge, terminals, engine and chassis grounds, main starter cable, and starter relay. If the machine stops starting immediately after filter replacement, check the recent work before assuming component failure. Multiple fault codes often point to battery issues, poor grounds, or connector problems.
What should be checked when buying a used machine with the SAA6D170E-3C-8 engine?
Verify the engine serial number starts at 310001 to confirm the correct configuration. Check the hydraulic system performance both cold and hot to identify internal leakage. Inspect the cooling package for debris packed between the radiator, hydraulic oil cooler, and charge-air cooler. Test the undercarriage for track tension, roller condition, and chain wear. Check for signs of oil leaks from the final drives and swing motor. Verify the condition of the air and fuel filters and the quality of the hydraulic oil. Ensure the engine starts reliably and does not lose power under load.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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