Komatsuengine(no series)
Komatsu S6D170-1D(S/N 10490-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu S6D170-1D engine (S/N 10490-UP) is a six-cylinder, liquid-cooled diesel powerplant designed for heavy-duty construction applications. It powers the PC650-1 and PC1500-1 crawler excavators, as well as the WA600-1 series wheel loaders. The engine features a 170 mm bore and a 23.1-liter displacement, delivering approximately 700 hp (520 kW) at 1800 rpm. Production for this specific serial range spans the mid-1980s to the early 1990s. It serves as the predecessor to the S6D170-2 series and is succeeded by the SAA6D170-2 in later Tier 2/Stage II compliant models. Configurations include standard turbocharged variants for excavators and specialized versions for wheel loaders.
Across the S6D170 series generations, the primary changes involved emissions compliance upgrades and electronic control integration. The S6D170-1D represents the mechanical injection era before the widespread adoption of common rail systems in the SAA6D170-2. In the used and parts market, this engine remains critical because it powers massive mining and heavy excavation equipment that is still active in the field. Its mechanical simplicity compared to modern Tier 4 engines makes it a frequent candidate for rebuild and overhaul, sustaining a robust aftermarket for gaskets, pistons, and liners.
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 S6D170-1D(S/N 10490-UP) specifications
Engine
| Model | S6D170-1D |
| Arrangement | 6 cylinder in-line, turbocharged |
| Displacement | 23.2 L (1,415.7 cu in) |
| Bore | 170.0 mm (6.69 in) |
| Stroke | 170.0 mm (6.69 in) |
| Gross Power | 391 kW (524 hp) @ 1,800 rpm |
| Torque | 2,650 N·m (1,954 lbf·ft) @ 1,300 rpm |
| Emissions Tier | Not documented for this exact serial range — verify with your dealer |
Weights
| Engine Weight | Approx. 2,740 kg (6,040 lb) |
Dimensions
| Length | 1,860 mm (73.2 in) |
| Width | 1,240 mm (48.8 in) |
| Height | 2,093 mm (82.4 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 S6D170-1D(S/N 10490-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 S6D170-1D(S/N 10490-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize KOWA fluid analysis at every 500-hour interval to monitor wear metals and contamination. For the S6D170-1D, track iron and copper levels in engine oil to detect liner and bearing wear early. Analyze hydraulic fluid for particle count and viscosity changes to protect the PC650-1 and WA600-1 hydraulic pumps. Monitor coolant pH and SCA concentration to prevent cavitation erosion in the 23.1-liter block. Consistent sampling prevents catastrophic failure in high-load mining applications.
Corrective & Common Repairs
Address intermittent starting and dashboard failures by inspecting the engine controller power supply and sensor wiring on the S6D170-1D. Common repairs include replacing worn fuel injectors to restore power and reduce black smoke. Fix hydraulic hose leaks and cracked clamps during the 2000-hour service. Replace worn track rollers and idlers on the PC1500-1 undercarriage to maintain ground pressure. Repairing turbocharger seals restores boost pressure and fuel efficiency in the WA600-1 loader.
Overhaul & Rebuild Points
Perform out-of-frame overhaul when compression drops or oil consumption exceeds limits. The S6D170-1D requires piston, ring, and liner replacement for the 170 mm bore cylinders. Inspect the crankshaft journals and replace bearings if clearance exceeds factory specs. Rebuild the hydraulic pump and swing machinery during major service intervals. Use genuine gasket sets for the PC650-1 engine block to ensure proper sealing under high thermal stress.
Seasonal & Environment Servicing
In cold climates, check coolant glycol content and use appropriate winter-grade Komatsu diesel oil to ensure cold starts for the S6D170-1D. In dusty environments, inspect the air filter restriction indicator daily and clean radiator fins frequently to prevent overheating in the WA600-1 loader. Drain the fuel water separator daily to prevent corrosion in the injection system. Verify battery terminal integrity and alternator output before winter operations on the PC1500-1 excavator.
S6D170-1D(S/N 10490-UP) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 600-311-8291 | Cartridge,Fuel Filter | Fuel system service | Check fitment → |
| 6127-71-6203 | Fuel Filter Ass'Y | Fuel system service | Check fitment → |
| 09637-30161 | Plate? Instruction,Air Cleaner (Single Element) | Air intake service | Check fitment → |
| 09637-30262 | Plate? Instruction,Air Cleaner (Double Element) | Air intake service | Check fitment → |
| 6128-81-7042 | 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.
S6D170-1D(S/N 10490-UP) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| CA111 | Engine Controller Critical Internal Failure | ECM hardware malfunction or internal circuit failure. | Inspect ECM power and ground connections; replace or reprogram the Engine Control Module if connections are secure. |
| CA115 | Engine Speed and Backup Speed Sensor Error | Faulty crankshaft speed sensor, broken wiring, or corroded connector. | Check the speed sensor gap and wiring harness integrity; replace the sensor if voltage signals are absent or erratic. |
| CA122 | Charge Air Pressure Sensor High Error | Sensor feedback voltage too high or sensor failure. | Verify the intake air pressure sensor wiring and connector; test sensor output against factory specifications. |
| CA123 | Charge Air Pressure Sensor Low Error | Sensor feedback voltage too low, short circuit, or airflow restriction. | Check for sensor short circuits and inspect the intake system for blockages or leaks. |
| CA131 | Throttle Sensor High Error | Throttle plate sensor feedback voltage too high. | Inspect the throttle motor sensor wiring and connector; verify throttle calibration. |
| CA132 | Throttle Sensor Low Error | Throttle plate sensor feedback voltage too low. | Check the throttle sensor circuit for shorts or open wires; verify sensor operation. |
| CA144 | Coolant Temperature Sensor High Error | Coolant temperature sensor feedback voltage too high. | Inspect the coolant temperature sensor and its wiring; replace the sensor if it fails voltage tests. |
| CA145 | Coolant Temperature Sensor Low Error | Coolant temperature sensor feedback voltage too low. | Check the sensor circuit for shorts or open connections; verify sensor resistance. |
| CA441 | Battery Voltage Low Error | Low battery voltage or charging system failure. | Check battery charge state, alternator output, and main power cables; replace faulty charging components. |
| CA442 | Battery Voltage High Error | Excessive battery voltage from regulator failure. | Test the alternator voltage regulator and charging system; replace the regulator or alternator if output is excessive. |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
S6D170-1D(S/N 10490-UP) attachments & work tools
Wheel Loader Attachments
The S6D170-1D engine (S/N 10490-16040) is specified for the WA600-1, WA600-1A, and WA600-1H wheel loader models. Subsequent serial numbers (16041-Up) continue to use this engine variant for the WA600-1A and WA600-1H configurations. The WA600-1L model utilizes the S6D170-1D-W engine variant starting from serial 14674-Up.
Excavator Attachments
The S6D170-1 engine series is documented for the PC650-1 and PC1500-1 crawler excavators. Factory parts books for the S6D170-1 engine explicitly list these machine models as applicable for engine serial numbers 10025 and up, and 10126 and up.
Generator Set Attachments
The S6D170-1D engine is used in the EGS650 generator set. The S6D170E-2A engine variant is specified for the EGS1000-7 and EGS1050-7 generator sets. These industrial power units utilize the 6D170 series architecture for high-capacity power generation.
Bulldozer Attachments
The S6D170-1 engine is associated with the PC1000-1 machine configuration in parts documentation. The WA700-1L and WA700-3L wheel loader models also utilize the S6D170E engine family, indicating cross-application of the 170 series for heavy-duty earthmoving and material handling tasks.
All S6D170-1D(S/N 10490-UP) assemblies by section
Every catalogued assembly group for the Komatsu S6D170-1D(S/N 10490-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Accessory
Komatsu : S6d170-1d(S/N 10490-Up) : Accessory : Air Compressor
| 61***00 | Air Compressor Ass'Y | 1 |
| DK***00 | Cylinder | 1 |
| DK***40 | Gasket,Air Compressor | 1 |
Komatsu : S6d170-1d(S/N 10490-Up) : Accessory : Air Compressor And Mounting
| 01***25 | Bolt,(Without Auto Priming System) | 6 |
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 2 |
| 01***70 | Bolt, Heater Hose Clip | 2 |
Komatsu : S6d170-1d(S/N 10490-Up) : Accessory : Air Compressor Piping (1/2)(#13302-)
| 01***25 | Bolt,(Without Auto Priming System) | 1 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 1 |
| 01***08 | Nut, Regular Hexagon (M10-1.50) | 1 |
Komatsu : S6d170-1d(S/N 10490-Up) : Accessory : Air Compressor Piping (2/2)(#13302-)
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***30 | Bolt,(Cold Terrain Spec.) | 2 |
| 01***55 | Bolt,(For Trimming Dozer) | 2 |
Komatsu : S6d170-1d(S/N 10490-Up) : Accessory : Air Compressor Piping(#10490-12361)
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***25 | Bolt,(Without Auto Priming System) | 1 |
| 01***30 | Bolt,(Cold Terrain Spec.) | 2 |
Komatsu : S6d170-1d(S/N 10490-Up) : Accessory : Air Compressor Piping(#12362-13301)
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***25 | Bolt,(Without Auto Priming System) | 1 |
| 01***30 | Bolt,(Cold Terrain Spec.) | 2 |
Cooling System
Komatsu : S6d170-1d(S/N 10490-Up) : Cooling System : Cooling Fan And Mounting
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 6 |
| 01***45 | Bolt,(Cold Terrain Spec.) | 6 |
Komatsu : S6d170-1d(S/N 10490-Up) : Cooling System : Corrosion Resistor And Piping(#10490-12957)
| 01***35 | Bolt,(Without Auto Priming System) | 2 |
| 01***30 | Bolt,(For France Noise Suppression) | 2 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 2 |
Komatsu : S6d170-1d(S/N 10490-Up) : Cooling System : Corrosion Resistor And Piping(#12958-)
| 01***35 | Bolt,(Without Auto Priming System) | 2 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 2 |
| 01***06 | Nut, Regular Hexagon (M8-1.25) | 1 |
Komatsu : S6d170-1d(S/N 10490-Up) : Cooling System : Tension Pulley
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 1 |
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 3 |
Komatsu : S6d170-1d(S/N 10490-Up) : Cooling System : Water Pump And Mounting
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***30 | Bolt,(For France Noise Suppression) | 5 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 1 |
Cylinder Block
Komatsu : S6d170-1d(S/N 10490-Up) : Cylinder Block : Camshaft And Cam Follower
| 01***32 | Washer,(Not Used With Emergency Str.) | 12 |
| 04***38 | Key | 1 |
| 04***12 | Ring, Snap (4) | 2 |
Komatsu : S6d170-1d(S/N 10490-Up) : Cylinder Block : Crankshaft
| 04***28 | Key, Plain Woodruff | 1 |
| 04***24 | Pin,Dowel (For No.3 Housing) | 1 |
| 61***20 | Washer | 6 |
Komatsu : S6d170-1d(S/N 10490-Up) : Cylinder Block : Cylinder Block Cover
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***30 | Bolt,(For France Noise Suppression) | 18 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 1 |
Komatsu : S6d170-1d(S/N 10490-Up) : Cylinder Block : Cylinder Block(#10490-11896)
| 01***18 | Bolt | 6 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***30 | Bolt,(For France Noise Suppression) | 9 |
Komatsu : S6d170-1d(S/N 10490-Up) : Cylinder Block : Cylinder Block(#11897-)
| 01***18 | Bolt | 6 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***30 | Bolt,(For France Noise Suppression) | 5 |
Komatsu : S6d170-1d(S/N 10490-Up) : Cylinder Block : Flywheel And Flywheel Housing
| 01***20 | Bolt,(Large Capacity Type) (Std) | 11 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***25 | Bolt - Rear Guard Mounting | 4 |
Komatsu : S6d170-1d(S/N 10490-Up) : Cylinder Block : Front Cover And Front Support(#10490-11288)
| 01***16 | Bolt,(For Slag Handling) | 12 |
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***85 | Bolt, Control Valve Mounting | 2 |
Komatsu : S6d170-1d(S/N 10490-Up) : Cylinder Block : Front Cover And Front Support(#11289-)
| 01***16 | Bolt,(For Slag Handling) | 12 |
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***85 | Bolt, Control Valve Mounting | 2 |
Komatsu : S6d170-1d(S/N 10490-Up) : Cylinder Block : Gear Case And Gear
| 01***60 | Bolt, Trunnion Cap | 10 |
| 01***35 | Bolt,(For Pedal Steering) | 4 |
| 01***40 | Bolt,(Not Used With Cab) | 2 |
Komatsu : S6d170-1d(S/N 10490-Up) : Cylinder Block : Oil Pan (Cold Terrain Spec. -30?C? -40?C)(#10490-12924)
| 01***30 | Bolt,(For France Noise Suppression) | 141 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 3 |
| 01***90 | Bolt (M10-1.50x90) | 2 |
Komatsu : S6d170-1d(S/N 10490-Up) : Cylinder Block : Oil Pan (Cold Terrain Spec. -30?C? -40?C)(#12925-)
| 01***30 | Bolt,(For France Noise Suppression) | 44 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 1 |
| 01***90 | Bolt (M10-1.50x90) | 2 |
Komatsu : S6d170-1d(S/N 10490-Up) : Cylinder Block : Oil Pan(#10490-12924)
| 01***30 | Bolt,(For France Noise Suppression) | 141 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 3 |
| 01***90 | Bolt (M10-1.50x90) | 2 |
Komatsu : S6d170-1d(S/N 10490-Up) : Cylinder Block : Oil Pan(#12925-)
| 01***30 | Bolt,(For France Noise Suppression) | 44 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 1 |
| 01***90 | Bolt (M10-1.50x90) | 2 |
Komatsu : S6d170-1d(S/N 10490-Up) : Cylinder Block : Piston And Connecting Rod
| 02***13 | Pin, Dowel | 4 |
| 61***60 | Piston Ring Ass'Y, Per Cylinder | 6 |
| 61***20 | Piston | 6 |
Komatsu : S6d170-1d(S/N 10490-Up) : Cylinder Block : Power Take Off
| 01***30 | Bolt,(For France Noise Suppression) | 7 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 1 |
| 01***20 | Bolt,(Used When Towing Winch) | 8 |
Cylinder Head
Komatsu : S6d170-1d(S/N 10490-Up) : Cylinder Head : Air Cleaner And Mounting(#10490-12459)
| 01***30 | Bolt,(For France Noise Suppression) | 6 |
| 01***70 | Bolt, Spacer | 2 |
| 01***75 | Bolt,(For D57sr) | 2 |
Komatsu : S6d170-1d(S/N 10490-Up) : Cylinder Head : Air Cleaner And Mounting(#12460-)
| 01***70 | Bolt, Spacer | 2 |
| 01***75 | Bolt,(For D57sr) | 2 |
| 01***08 | Nut, Regular Hexagon (M10-1.50) | 8 |
Komatsu : S6d170-1d(S/N 10490-Up) : Cylinder Head : Air Intake Manifold And Connection
| 01***40 | Bolt,(For Position Fixing) | 4 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 4 |
| 01***95 | Bolt,(For Reversible Fan) | 12 |
Komatsu : S6d170-1d(S/N 10490-Up) : Cylinder Head : Cylinder Head
| 07***28 | O-Ring,(For Transmission Screen) | 2 |
| 07***08 | Plug (Kit) | 4 |
| 07***11 | Plug,(For Shipping) | 1 |
Komatsu : S6d170-1d(S/N 10490-Up) : Cylinder Head : Exhaust Manifold And Turbocharger
| 01***65 | Bolt | 2 |
| 01***90 | Bolt | 22 |
| 01***50 | Bolt - Spider To Transmission And To Front Drive | 4 |
Komatsu : S6d170-1d(S/N 10490-Up) : Cylinder Head : Muffler And Mounting(#10490-13004)
| 01***35 | Bolt | 1 |
| 01***30 | Bolt, Mount Pump | 2 |
| 01***70 | Capscrew - M12 | 4 |
Komatsu : S6d170-1d(S/N 10490-Up) : Cylinder Head : Muffler And Mounting(#13005-)
| 01***35 | Bolt | 1 |
| 01***30 | Bolt, Mount Pump | 2 |
| 01***70 | Capscrew - M12 | 4 |
Komatsu : S6d170-1d(S/N 10490-Up) : Cylinder Head : Muffler Piping(#10490-13004)
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 1 |
| 01***90 | Bolt,For Reversible Fan | 2 |
| 01***25 | Bolt, Mount Cover | 2 |
Komatsu : S6d170-1d(S/N 10490-Up) : Cylinder Head : Muffler Piping(#13005-)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 1 |
| 01***25 | Bolt, Mount Cover | 2 |
Komatsu : S6d170-1d(S/N 10490-Up) : Cylinder Head : Rocker Arm And Housing
| 01***45 | Bolt,(Cold Terrain Spec.) | 6 |
| 01***55 | Bolt,(For France Noise Suppression) | 6 |
| 01***90 | Bolt,For Reversible Fan | 36 |
Komatsu : S6d170-1d(S/N 10490-Up) : Cylinder Head : Rocker Arm Housing Cover(#10490-12459)
| 01***55 | Bolt,(For Suction? Reversible Fan) | 55 |
| 01***00 | Bolt (M10-1.50x100) | 3 |
| 01***20 | Bolt, Mount Main Relief Valve | 1 |
Komatsu : S6d170-1d(S/N 10490-Up) : Cylinder Head : Rocker Arm Housing Cover(#12460-)
| 01***55 | Bolt,(For Suction? Reversible Fan) | 28 |
| 01***20 | Bolt, Mount Main Relief Valve | 2 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 30 |
Komatsu : S6d170-1d(S/N 10490-Up) : Cylinder Head : Turbocharger(#10490-11899)
| 01***16 | Bolt,(For Slag Handling) | 4 |
| 01***16 | Bolt | 8 |
| 04***08 | Pin, Dowel | 1 |
Komatsu : S6d170-1d(S/N 10490-Up) : Cylinder Head : Turbocharger(#11900-14924)
| 01***16 | Bolt,(For Slag Handling) | 4 |
| 01***16 | Bolt | 8 |
| 04***08 | Pin, Dowel | 1 |
Komatsu : S6d170-1d(S/N 10490-Up) : Cylinder Head : Turbocharger(#14925-)
| 01***16 | Bolt,(For Slag Handling) | 4 |
| 01***16 | Bolt | 8 |
| 04***08 | Pin, Dowel | 1 |
Komatsu : S6d170-1d(S/N 10490-Up) : Cylinder Head : Water Manifold And Thermostat(#10490-11343)
| 01***12 | Bolt,(Without R.P.C.U.) | 1 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 13 |
| 01***30 | Bolt,(For France Noise Suppression) | 4 |
Komatsu : S6d170-1d(S/N 10490-Up) : Cylinder Head : Water Manifold And Thermostat(#11344-)
| 01***12 | Bolt,(Without R.P.C.U.) | 1 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 13 |
| 01***30 | Bolt,(For France Noise Suppression) | 4 |
Komatsu : S6d170-1d(S/N 10490-Up) : Cylinder Head : Water Piping(#10490-12361)
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***30 | Bolt,(For France Noise Suppression) | 4 |
Komatsu : S6d170-1d(S/N 10490-Up) : Cylinder Head : Water Piping(#12362-)
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***30 | Bolt,(For France Noise Suppression) | 4 |
Electrical System
Komatsu : S6d170-1d(S/N 10490-Up) : Electrical System : Alternator (35a)
| 60***30 | Alternator A. (35a) | 1 |
| KD***80 | Collar | 1 |
| KD***62 | Screw | 3 |
Komatsu : S6d170-1d(S/N 10490-Up) : Electrical System : Alternator (50a)
| 60***81 | Alternator A. (50a) | 1 |
| SD***X0 | Coil Assembly | 1 |
| SD***X0 | Washer | 1 |
Komatsu : S6d170-1d(S/N 10490-Up) : Electrical System : Alternator (75a)
| 60***50 | Alternator A. (75a) | 1 |
| SD***X0 | Coil Assembly | 1 |
| SD***X0 | Washer | 1 |
Komatsu : S6d170-1d(S/N 10490-Up) : Electrical System : Alternator And Mounting (35a? 50a? 75a)
| 01***30 | Bolt,(For France Noise Suppression) | 4 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 1 |
| 01***35 | Bolt,(Cold Weather Spec.) | 1 |
Komatsu : S6d170-1d(S/N 10490-Up) : Electrical System : Alternator Drive
| 01***30 | Bolt,(For France Noise Suppression) | 2 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 2 |
| 04***24 | Pin, Spring | 1 |
Komatsu : S6d170-1d(S/N 10490-Up) : Electrical System : Starting Motor (7.5kw)
| 60***10 | Starting Motor Ass'Y,(7.5kw) | 2 |
| KD***20 | Magnetic Switch Assembly | 1 |
| KD***40 | Spring,Spring | 4 |
Komatsu : S6d170-1d(S/N 10490-Up) : Electrical System : Starting Motor And Mounting (7.5kw)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***20 | Bolt,(Used When Towing Winch) | 2 |
| 01***45 | Bolt,(For Slag Handling) | 6 |
Engine Kit
Komatsu : S6d170-1d(S/N 10490-Up) : Engine Kit : Gasket Kit
| 01***23 | Washer,Lock (K3) | 2 |
| 02***43 | O-Ring,Water Manifold | 4 |
| 02***75 | O-Ring,(For Japan) (K1) | 4 |
Fuel System
Komatsu : S6d170-1d(S/N 10490-Up) : Fuel System : Additional Fuel Filer
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***45 | Bolt, Mount Bracket | 2 |
| 01***16 | Washer,(With Shoe Slip Control) | 4 |
Komatsu : S6d170-1d(S/N 10490-Up) : Fuel System : Auto Priming System(#10490-12957)
| 01***12 | Bolt,(Without R.P.C.U.) | 4 |
| 01***60 | Bolt,(Without Alternator Bracket) | 7 |
| 01***65 | Bolt,(For Alternator Bracket Mount) | 1 |
Komatsu : S6d170-1d(S/N 10490-Up) : Fuel System : Auto Priming System(#12958-)
| 01***12 | Bolt,(Without R.P.C.U.) | 4 |
| 01***60 | Bolt,(Without Alternator Bracket) | 7 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 2 |
Komatsu : S6d170-1d(S/N 10490-Up) : Fuel System : Engine Stop Motor And Mounting(#11897-11899)
| 01***16 | Bolt,(Sandy And Dusty Spec.) | 1 |
| 01***40 | Bolt, Mount Solenoid Valve Body | 4 |
| 01***40 | Screw | 3 |
Komatsu : S6d170-1d(S/N 10490-Up) : Fuel System : Engine Stop Motor And Mounting(#11900-)
| 01***40 | Bolt | 3 |
| 01***45 | Bolt | 3 |
| 01***16 | Bolt,(Sandy And Dusty Spec.) | 2 |
Komatsu : S6d170-1d(S/N 10490-Up) : Fuel System : Fuel Filter And Piping(#10490-11723)
| 01***65 | Bolt,(For Alternator Bracket Mount) | 1 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***30 | Bolt,(For France Noise Suppression) | 4 |
Komatsu : S6d170-1d(S/N 10490-Up) : Fuel System : Fuel Filter And Piping(#11724-12957)
| 01***65 | Bolt,(For Alternator Bracket Mount) | 1 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***30 | Bolt,(For France Noise Suppression) | 4 |
Komatsu : S6d170-1d(S/N 10490-Up) : Fuel System : Fuel Filter And Piping(#12958-)
| 01***30 | Bolt,(For France Noise Suppression) | 4 |
| 01***25 | Bolt (M10x1.50x25) | 2 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 4 |
Komatsu : S6d170-1d(S/N 10490-Up) : Fuel System : Fuel Injection Pump (Feed Pump)(#10490-11896)
| DK***00 | Valve,Check | 2 |
| DK***20 | Bolt,Joint | 1 |
| DK***30 | Eye,Joint | 1 |
Komatsu : S6d170-1d(S/N 10490-Up) : Fuel System : Fuel Injection Pump (Feed Pump)(#11897-13460)
| DK***00 | Valve,Check | 2 |
| DK***20 | Bolt,Joint | 1 |
| DK***30 | Eye,Joint | 1 |
Komatsu : S6d170-1d(S/N 10490-Up) : Fuel System : Fuel Injection Pump (Feed Pump)(#13461-)
| DK***00 | Valve,Check | 2 |
| DK***20 | Bolt,Joint | 1 |
| DK***30 | Eye,Joint | 1 |
Komatsu : S6d170-1d(S/N 10490-Up) : Fuel System : Fuel Injection Pump (Governor) (1/2)(#10490-11896)
| DK***00 | Gear | 1 |
| DK***20 | Capsule,Spring | 1 |
| DK***20 | Flyweight Ass'Y | 1 |
Komatsu : S6d170-1d(S/N 10490-Up) : Fuel System : Fuel Injection Pump (Governor) (1/2)(#11897-13460)
| DK***00 | Gear | 1 |
| DK***20 | Capsule,Spring | 1 |
| DK***20 | Flyweight Ass'Y | 1 |
Komatsu : S6d170-1d(S/N 10490-Up) : Fuel System : Fuel Injection Pump (Governor) (1/2)(#13461-)
| DK***00 | Gear | 1 |
| DK***00 | Shim? 2.00mm,(High Altitude Spec.) | 0 |
| DK***20 | Capsule,Spring | 1 |
Komatsu : S6d170-1d(S/N 10490-Up) : Fuel System : Fuel Injection Pump (Governor) (2/2)(#10490-11896)
| DK***00 | Bushing | 1 |
| DK***40 | Gasket,Air Compressor | 2 |
| DK***00 | Nut,Cap | 1 |
Komatsu : S6d170-1d(S/N 10490-Up) : Fuel System : Fuel Injection Pump (Governor) (2/2)(#11897-13460)
| DK***00 | Bushing | 1 |
| DK***40 | Gasket,Air Compressor | 2 |
| DK***00 | Nut,Cap | 1 |
Komatsu : S6d170-1d(S/N 10490-Up) : Fuel System : Fuel Injection Pump (Governor) (2/2)(#13461-)
| DK***00 | Bushing | 1 |
| DK***40 | Gasket,Air Compressor | 2 |
| DK***00 | Nut,Cap | 1 |
Komatsu : S6d170-1d(S/N 10490-Up) : Fuel System : Fuel Injection Pump (Pump) (1/2)(#10490-11896)
| 61***80 | Injection Pump Ass'Y | 1 |
| DK***30 | Bearing,Roller | 2 |
| DK***40 | Gasket,Air Compressor | 1 |
Komatsu : S6d170-1d(S/N 10490-Up) : Fuel System : Fuel Injection Pump (Pump) (1/2)(#11897-13460)
| 61***81 | Injection Pump Ass'Y | 1 |
| DK***30 | Bearing,Roller | 2 |
| DK***40 | Gasket,Air Compressor | 1 |
Komatsu : S6d170-1d(S/N 10490-Up) : Fuel System : Fuel Injection Pump (Pump) (1/2)(#13461-)
| 61***82 | Injection Pump Ass'Y | 1 |
| DK***30 | Bearing,Roller | 2 |
| DK***40 | Gasket,Air Compressor | 1 |
Komatsu : S6d170-1d(S/N 10490-Up) : Fuel System : Fuel Injection Pump (Pump) (2/2)(#10490-11896)
| DK***30 | Washer | 12 |
| DK***00 | Shim? 0.40mm | 0 |
| DK***00 | Shim? 1.00mm | 0 |
Komatsu : S6d170-1d(S/N 10490-Up) : Fuel System : Fuel Injection Pump (Pump) (2/2)(#11897-13460)
| DK***30 | Washer | 12 |
| DK***00 | Shim? 0.40mm | 0 |
| DK***00 | Shim? 1.00mm | 0 |
Komatsu : S6d170-1d(S/N 10490-Up) : Fuel System : Fuel Injection Pump (Pump) (2/2)(#13461-)
| DK***30 | Washer | 12 |
| DK***00 | Shim? 0.40mm | 0 |
| DK***00 | Shim? 1.00mm | 0 |
Komatsu : S6d170-1d(S/N 10490-Up) : Fuel System : Fuel Injection Pump And Mounting(#10490-11896)
| 01***55 | Bolt,(For Suction? Reversible Fan) | 2 |
| 01***65 | Bolt,(For Suction Fan)(4d130-1d) | 2 |
| 01***30 | Bolt,Radio Controlled Slag Handling | 2 |
Komatsu : S6d170-1d(S/N 10490-Up) : Fuel System : Fuel Injection Pump And Mounting(#11897-)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***55 | Bolt,(For Suction? Reversible Fan) | 2 |
| 01***65 | Bolt,(For Suction Fan)(4d130-1d) | 2 |
Komatsu : S6d170-1d(S/N 10490-Up) : Fuel System : Fuel Injection Pump Piping
| 01***30 | Bolt | 7 |
| 01***35 | Bolt | 3 |
| 01***35 | Bolt,(Without Auto Priming System) | 2 |
Komatsu : S6d170-1d(S/N 10490-Up) : Fuel System : Fuel Nozzle And Spill Pipe(#10490-16040)
| 07***13 | Tube,(See Fig.0421-13) | 5 |
| 07***14 | Tube, Spill | 5 |
| 07***80 | Clip | 10 |
Komatsu : S6d170-1d(S/N 10490-Up) : Fuel System : Fuel Nozzle And Spill Pipe(#16041-)
| 07***14 | Tube, Spill | 5 |
| 07***80 | Clip | 10 |
| 61***10 | Bolt,Nozzle Holder | 12 |
Komatsu : S6d170-1d(S/N 10490-Up) : Fuel System : Solenoid And Mounting(#10490-11896)
| 01***25 | Bolt (M6-1.00x25) | 4 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 1 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 2 |
Lubricating Oil System
Komatsu : S6d170-1d(S/N 10490-Up) : Lubricating Oil System : Lubricating Oil Cooler
| 01***16 | Bolt (Welded) | 10 |
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***25 | Bolt,(Without Auto Priming System) | 6 |
Komatsu : S6d170-1d(S/N 10490-Up) : Lubricating Oil System : Lubricating Oil Cooler (Cold Terrain Spec.)
| 01***16 | Bolt (Welded) | 10 |
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***25 | Bolt,(Without Auto Priming System) | 6 |
Komatsu : S6d170-1d(S/N 10490-Up) : Lubricating Oil System : Lubricating Oil Filter And Mounting
| 01***40 | Bolt,(Dust And Dirt Protection) | 2 |
| 01***45 | Bolt,(Cold Terrain Spec.) | 6 |
| 01***50 | Bolt - Torque Converter Totransmission Mounting | 2 |
Komatsu : S6d170-1d(S/N 10490-Up) : Lubricating Oil System : Lubricating Oil Pump And Suction Pipe
| 01***20 | Bolt,(Large Capacity Type) (Std) | 1 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 2 |
Komatsu : S6d170-1d(S/N 10490-Up) : Lubricating Oil System : Mechanical Pump And Piping
| 01***16 | Bolt (Welded) | 2 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 1 |
| 01***12 | Bolt | 4 |
Komatsu : S6d170-1d(S/N 10490-Up) : Lubricating Oil System : Turbocharger Lubricating Oil Piping(#10490-12459)
| 01***16 | Bolt,(For Slag Handling) | 2 |
| 01***16 | Bolt,(Sandy And Dusty Spec.) | 1 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
Komatsu : S6d170-1d(S/N 10490-Up) : Lubricating Oil System : Turbocharger Lubricating Oil Piping(#12460-)
| 01***16 | Bolt,(For Slag Handling) | 1 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 1 |
S6D170-1D(S/N 10490-UP) serial number reference
The engine serial number plate is typically located on the left side of the engine block near the injection pump or on a metal data plate affixed to the engine. The prefix is the first part of the engine model code (e.g., S6D170-1D), which identifies the engine family and generation, while the subsequent digits (10490-UP) indicate the specific build sequence within that engine model's production run. Cross-reference the engine serial number on the plate with the machine's chassis serial number to ensure correct parts catalog selection.
| Prefix | Identifies | Notes |
|---|---|---|
| S6D170-1D | Standard | Serial range 10490-UP. Factory spec sheet for S6D170-1D parts catalog lists this specific engine serial range for the S6D170-1D model. Variants S6D170-1D-6A, S6D170-1D-6T, and S6D170-1D-6W are listed for serial 10001-UP, indicating a different configuration or earlier production run not explicitly tied to the 10490-UP range in the provided catalog data. The S6D170-1D engine is used in WA600-1/1A/1H wheel loaders (serial 10490-16040) and WA600-1/1A/1H (serial 16041-Up) according to the Equipment Guide PDF. No specific years are given for this exact serial break in the source text, but the dash-1 generation generally corresponds to the late 1990s/early 2000s era for Komatsu engines. Confirm with dealer for exact year mapping for this specific serial break. |
Frequently asked questions
What engine does the Komatsu S6D170-1D (S/N 10490-UP) use?
It uses the Komatsu S6D170-1D, a 6-cylinder, 23.1-liter, liquid-cooled diesel engine producing approximately 700 hp (520 kW) at 1800 rpm.
What is the operating weight of the machines powered by this engine?
Operating weight varies by configuration. The PC650-1 excavator weighs approximately 65,000 kg (143,300 lb), while the PC1500-1 weighs approximately 150,000 kg (330,700 lb). The WA600-1 loader weighs approximately 58,000 kg (127,900 lb).
What replaced the S6D170-1D engine?
The S6D170-1D was succeeded by the S6D170-2 and later the SAA6D170-2 series engines to meet stricter emissions standards.
What S6D170-1D(S/N 10490-UP) owners discuss
What are the known powertrain and hydraulic behaviors for machines equipped with the S6D170-1D engine?
The S6D170-1D engine is typically found in large wheel loaders such as the WA600-1 series. These machines exhibit smooth hydraulic operation and high fuel efficiency. A common diagnostic pattern involves distinguishing between engine power loss and hydraulic system weakness; if engine RPM drops heavily during combined hydraulic functions, the hydraulic load may be excessive or the engine unable to produce expected power. If engine speed remains normal but movements weaken, the hydraulic system is the primary suspect. Machines may show reduced performance when hot due to decreased oil viscosity and internal leakage in pumps or valves. All hydraulic functions slowing simultaneously points to shared causes like oil level, filter condition, or engine RPM, while single-function slowness indicates circuit-specific issues like cylinder leakage or valve spool problems. The line is generally noted for smooth operation compared to earlier generation competitors; however, dash-6 machines in the broader Komatsu line had known valve problems that do not necessarily apply to this specific engine series.
What undercarriage or wear patterns are typical for machines using this engine?
Machines equipped with the S6D170-1D, such as the WA600-1 series, are heavy-duty wheel loaders subject to significant undercarriage wear. Track tension should be monitored regularly; repeated loosening indicates issues with the adjuster or component wear. Machines may drift or pull to one side due to track tension differences, mud packed into the undercarriage, roller condition, or track-chain wear. Testing travel speed in both forward and reverse helps isolate hydraulic or final-drive issues from mechanical resistance. Komatsu parts, including undercarriage components, are noted to be expensive; aftermarket options are often available for items like front idlers, while genuine parts carry a premium. The line is sometimes described as designed to wear out complete machines simultaneously, particularly if hydraulic pumps fail, which can impact resale value.
What are the engine quirks and characteristics of the S6D170-1D series?
The S6D170-1D is a 6-cylinder, liquid-cooled diesel engine with a displacement of approximately 23.1 liters. It features hardened liners matched to high-alloy rings and a Bosch-style fuel system with injectors operating at high pressure (around 3,200 PSI). The engine is known for reliability and durability, with Komatsu using hardened liners similar to Caterpillar designs. Owners and mechanics note that Komatsu engines are generally preferred over Cummins units in certain applications due to better piston ring performance and fewer issues with oil sludge or ring failure at lower hour counts. The engine design is robust, with a single head and high-pressure injection, contrasting with older soft-liner designs. The engine weight is approximately 1,700 kg for the SAA6D170 variant, though specific weight for the S6D170-1D may vary by configuration.
What are common electrical or sensor issues associated with this machine type?
Komatsu excavators and heavy equipment rely heavily on electronic control systems, meaning a single faulty sensor or unstable power supply can trigger multiple warning signals. Common electrical issues include intermittent starting, dashboard failures, and random machine shutdowns. These symptoms often stem from unstable power supplies or faulty sensors rather than major mechanical failures. Owners report that machines may display multiple fault codes due to these electrical instabilities. Diagnosis should start with checking battery state of charge, terminals, engine and chassis grounds, and main starter cables. Voltage collapse under load during starting indicates battery or connection issues rather than starter failure. The complexity of the electronic control systems requires careful diagnosis to avoid replacing components unnecessarily.
What should be checked when buying a used machine with the S6D170-1D engine (S/N 10490-UP)?
When purchasing a used machine with the S6D170-1D engine (serial number 10490 and up), verify the exact serial range to ensure correct parts and specifications, as the engine is used in models like the WA600-1 series. Check the hydraulic system for performance when hot, as internal leakage in pumps or valves may be less obvious when cold. Inspect the cooling package—including the radiator, hydraulic oil cooler, and charge-air cooler—for debris packed between heat exchangers. Test the engine under load to ensure it maintains RPM and does not lose power during combined hydraulic functions. Check for fault codes and electrical stability, including battery terminals and grounds. Inspect the undercarriage for track tension, roller condition, and track-chain wear. Verify the condition of the fuel system, including filters and water separator, and check for air leaks in the fuel supply. Be aware that Komatsu parts can be expensive, so assess the cost of potential replacements. Confirm the machine's history and maintenance records, particularly regarding hydraulic and engine servicing.
What are the recommended fluid specifications for the S6D170-1D engine and associated systems?
Komatsu specifies the use of Komatsu Genuine Lubricants and Coolants, which meet strict Komatsu Engineering Standards. For the engine, use Komatsu diesel engine oil. For the hydraulic system, use Komatsu hydraulic oil. For the cooling system, use Komatsu Super Coolant AF-NAC. Komatsu also offers Komatsu Oil/Fuel & Wear Analysis (KOWA) for monitoring fluid condition. Specific fluid types such as EO, TO, AXO, and HO are referenced in Komatsu documentation. Always consult the operation and maintenance manual for the specific machine model to confirm the exact fluid specifications and capacities, as they can vary by configuration and serial range.
What safety-critical fixes or inspections are recommended for the S6D170-1D engine?
Safety-critical inspections include verifying the condition of the engine and chassis grounds, main starter cable, and starter relay to prevent unexpected shutdowns or starting failures. Check the fuel system for air leaks and ensure the water separator is functioning correctly to prevent fuel contamination. Inspect the cooling system for leaks and proper coolant level to prevent overheating. Verify the hydraulic system pressure and flow to ensure safe operation of boom, arm, bucket, swing, and travel functions. Check the undercarriage for proper track tension to prevent derailment. Inspect the brake system and steering system for proper operation. Have your dealer verify any safety-critical repairs or modifications to ensure compliance with OEM specifications and safety standards.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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