Komatsuengine(no series)
Komatsu S6D170-1G-A(S/N 14674-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu S6D170-1G-A engine is a six-cylinder, liquid-cooled diesel powerplant designed for heavy-duty construction applications. It powers the PC650-1 and PC1500-1 crawler excavators, which are large-class machines with operating weights ranging from approximately 60,000 to 80,000 kg depending on configuration. Production for this specific engine serial range (14674-UP) aligns with the first generation of these excavators, preceding the SAA6D170-2 series. The engine was offered in various configurations to meet regional emissions standards, including specific variants for cold climates and high-altitude operation.
The S6D170-1G-A represents a critical transition point in Komatsu’s heavy excavator lineage, bridging the gap between early 6D170 designs and the more modern SAA6D170 series. In the used and parts market, this engine remains significant due to its widespread use in the PC650 and PC1500 platforms, which are still active in mining and large-scale earthmoving. The -1G-A designation specifically denotes a configuration optimized for specific export markets, often requiring distinct calibration and component sourcing compared to domestic Japanese variants. Its robust architecture and availability of overhaul kits keep it relevant for fleet maintenance.
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 S6D170-1G-A(S/N 14674-UP) specifications
Engine
| Model | S6D170-1G-A |
| Series/Generation | 170 Series |
| Arrangement | 6 cylinder in line engine, turbocharged |
| Displacement | 23.2 liter (1,415.7 cu in) |
| Bore | 170.0 mm (6.69 in) |
| Stroke | 170.0 mm (6.69 in) |
| Power | 391 kW (524 hp) @ 1800 rpm |
| Torque | 2650 Nm (1954 lbf-ft) @ 1300 rpm |
| Emissions Tier | Not documented for this exact serial range — verify with your dealer |
Weights
| Engine Weight | 2740 kg (6,041 lb) |
Dimensions
| Length | 1860 mm (73.2 in) |
| Width | 1240 mm (48.8 in) |
| Height | 2093 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 S6D170-1G-A(S/N 14674-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 S6D170-1G-A(S/N 14674-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize KOWA fluid analysis at every 500-hour interval to monitor engine wear metals and hydraulic contamination. Check coolant SCA concentration at 500 hours to prevent liner cavitation in the S6D170-1G-A block. Monitor DEF levels daily on Tier 4 compliant units to ensure emissions system integrity. Track fuel consumption trends to detect injector performance degradation early. Use KOMTRAX telematics to correlate load frequency with fluid degradation rates for optimized change intervals.
Corrective & Common Repairs
Address intermittent starting or dashboard failures by inspecting engine controller power circuits and sensor wiring. Replace worn hydraulic seals promptly to prevent pressure loss and sluggish boom movement. Inspect final drive gears for grinding noises indicating bearing wear. Check turbocharger shaft play and housing cracks under heavy load conditions. Replace air filter elements when the restriction indicator triggers to prevent dust ingestion into the intake manifold.
Overhaul & Rebuild Points
Plan for out-of-frame overhaul kits including pistons, rings, and bearings at high-hour intervals. Replace cylinder head gaskets and valve guides if compression drops or oil consumption increases. Inspect crankshaft journals for scoring during major service. Rebuild the fuel injection pump if power output fails to meet rated specifications. Replace the complete cylinder head assembly if valve seat wear exceeds limits or cracking is detected.
Seasonal & Environment Servicing
Install low-temperature lubricating oil coolers for operations in -30°C and -50°C environments. Verify high-altitude calibration settings for the S6D170-1G-A engine to maintain power output. Drain water from the fuel separator daily in humid or cold conditions to prevent icing. Inspect radiator and oil cooler fins for debris accumulation to ensure adequate cooling in dusty environments. Check belt tension and hose integrity in extreme heat to prevent failure.
S6D170-1G-A(S/N 14674-UP) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 600-311-8293 | Cartridge, Fuel Filter | Fuel system service | Check fitment → |
| 6127-71-6205 | Fuel Filter Ass'Y | Fuel system service | Check fitment → |
| ND092220-0040 | Filter,Fuel | Fuel system service | Check fitment → |
| 6128-81-7042 | Element Assembly, Air Cleaner | Air intake service | Check fitment → |
| 07000-02075 | O-Ring,Steering Oil Filter | Lubrication service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
S6D170-1G-A(S/N 14674-UP) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| CA115 | Engine crankshaft speed sensor failure | Broken sensor, wiring issue, or connector corrosion | Replace the speed sensor and verify the voltage at the pin connector |
| CA441 | Battery voltage too low | Alternator or battery failure; voltage regulator issue | Replace the alternator or battery; check the voltage regulator |
| CA442 | Battery voltage too high | Alternator or battery failure; voltage regulator issue | Replace the alternator or battery; check the voltage regulator |
| CA451 | Common rail pressure sensor feedback value too high | Malfunction in the rail sensor or actual overpressure condition | Diagnose the fuel rail pressure sensor or pump lines |
| CA559 | Common rail pressure too low | Fuel pump regulator (IMV/PCV) malfunction | Evaluate fuel pump regulator (IMV/PCV) |
| AA10NX | Air cleaner clogging | Dirty or blocked air filter element | Replace the air filter |
| CA122 | Intake air pressure sensor feedback voltage too high | Sensor malfunction or wiring issue | Verify the intake pressure sensor and wiring |
| CA123 | Intake air pressure sensor feedback voltage too low | Sensor short or airflow restriction | Check for a sensor short or an airflow restriction |
| CA144 | Coolant temperature sensor feedback voltage too high | Sensor malfunction or wiring issue | Test or replace the coolant temperature sensor |
| CA145 | Coolant temperature sensor feedback voltage too low | Sensor short or wiring issue | Test or replace the coolant temperature sensor |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
S6D170-1G-A(S/N 14674-UP) attachments & work tools
Wheel Loader Attachments
The S6D170-1G-A engine (S/N 14674-UP) powers the WA600-1L wheel loader series (S/N A10391-UP). Standard work tools include general-purpose buckets and rock buckets. Factory configurations for this engine class typically support quick-attach coupler systems for rapid tool changes.
Excavator Attachments
This engine is installed in PC650-1 and PC1500-1 excavators. Compatible work tools include standard digging buckets, heavy-duty rock buckets, and grading buckets. Hydraulic breaker kits are supported via auxiliary hydraulic circuits, requiring specific flow and pressure settings for the S6D170-1G-A power unit.
Generator Set Attachments
The S6D170-1G-A engine drives the EGS650, EGS760, and EGS850 generator sets. Work tools are limited to the generator frame and electrical output components. Factory guarding includes sound-attenuated canopies and weather protection packages specific to the industrial engine configuration.
Hydraulic System Configurations
Tools requiring auxiliary hydraulics must match the S6D170-1G-A pump flow rates. Hydraulic oil specifications require Komatsu HO or equivalent high-zinc hydraulic fluid. Coolant capacity and lubricating oil cooler options (for -30°C and -50°C environments) affect engine performance with high-flow work tools.
All S6D170-1G-A(S/N 14674-UP) assemblies by section
Every catalogued assembly group for the Komatsu S6D170-1G-A(S/N 14674-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Engine
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Additional Fuel Filter(#15667-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***45 | Bolt | 2 |
| 01***16 | Washer,(With Shoe Slip Control) | 4 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Air Cleaner(#15667-)
| 01***70 | Bolt - Bracket And Oil Inlet Tubemounting | 2 |
| 01***75 | Bolt (M10-1.50x75) | 2 |
| 01***08 | Nut, Regular Hexagon (M10-1.50) | 8 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Air Compressor (Inner Parts)(#15667-)
| 61***00 | Air Compressor Ass'Y | 1 |
| DK***00 | Cylinder | 1 |
| DK***40 | Gasket,Air Compressor | 1 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Air Compressor Gasket Kit(#15707-)
| 07***15 | O-Ring,(Without Boom Kickout) | 1 |
| 07***85 | O-Ring,(Without Fuel Level Gauge) | 1 |
| 07***28 | O-Ring, Strainer To Control Pump Line | 1 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Air Compressor Mounting(#15667-)
| 01***35 | Bolt, Mount Ground Driven Steering Pump | 2 |
| 01***70 | Bolt - Accumulator Mounting Bracket | 2 |
| 01***75 | Bolt - Tube Mounting | 1 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Air Compressor Piping (1/2)(#15667-)
| 01***55 | Screw | 3 |
| 01***60 | Bolt,(F4320-52a0 -5- ) | 2 |
| 07***12 | Gasket,(Without Air Compressor Type) (K1) | 8 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Air Compressor Piping (2/2)(#15667-)
| 01***25 | Bolt,(Without Auto Priming System) | 1 |
| 01***20 | Bolt,(For Mono Lever Steering) | 1 |
| 01***30 | Bolt,(With Body Positioner) | 2 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Air Intake Manifold And Connection(#15667-17480)
| 01***40 | Screw, Hex Socket | 4 |
| 01***20 | Bolt,(For Mono Lever Steering) | 4 |
| 01***95 | Capscrew | 13 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Air Intake Manifold And Connection(#17481-)
| 01***40 | Screw, Hex Socket | 4 |
| 01***20 | Bolt,(For Mono Lever Steering) | 4 |
| 01***95 | Capscrew | 15 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Alternator (50a) (Inner Parts)(#15667-)
| 60***81 | Alternator A. (50a) | 1 |
| SD***X0 | Coil Assembly | 1 |
| SD***X0 | Washer | 1 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Alternator (75a) (Inner Parts)(#15667-)
| 60***50 | Alternator A. (75a) | 1 |
| SD***X0 | Coil Assembly | 1 |
| SD***X0 | Washer | 1 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Alternator Drive(#15667-)
| 01***30 | Bolt,(With Body Positioner) | 2 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 2 |
| 04***24 | Pin, Spring | 1 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Alternator Mounting (50a)(#15667-)
| 01***30 | Bolt,(With Body Positioner) | 4 |
| 01***40 | Bolt (Op) | 1 |
| 01***35 | Bolt,(Cold Weather Spec.) | 1 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Alternator Mounting (75a)(#15667-)
| 01***30 | Bolt,(With Body Positioner) | 4 |
| 01***40 | Bolt (Op) | 1 |
| 01***35 | Bolt,(Cold Weather Spec.) | 1 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Auto Priming System(#15667-)
| 01***12 | Bolt - Front Cover Mounting | 4 |
| 01***60 | Bolt,(With Body Positioner) | 8 |
| 01***20 | Bolt,(For Mono Lever Steering) | 2 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Camfollower Cover(#15667-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 1 |
| 01***30 | Bolt,(With Body Positioner) | 19 |
| 01***35 | Bolt,(F4320-52a0 -5 ) | 1 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Camshaft And Camfollower(#15667-17480)
| 01***32 | Washer,(Not Used With Emergency Str.) | 12 |
| 04***38 | Key | 1 |
| 04***12 | Ring, Snap (4) | 2 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Camshaft And Camfollower(#17481-)
| 01***32 | Washer,(Not Used With Emergency Str.) | 12 |
| 04***38 | Key | 1 |
| 04***12 | Ring, Snap (4) | 2 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Cooling Fan(#15667-)
| 01***40 | Bolt,For Weight Adjusting Bolt | 6 |
| 01***36 | Washer,Radio Controlled Slag Handling | 6 |
| 60***20 | Fan,(High Speed) | 1 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Corrosion Resistor(#15667-)
| 01***35 | Bolt,(For Fix Position) | 2 |
| 01***40 | Bolt (Op) | 2 |
| 01***06 | Nut, Regular Hexagon (M8-1.25) | 1 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Crank Pulley
| 61***20 | Washer | 6 |
| 61***11 | Pulley? Hardening | 1 |
| 61***22 | Bolt | 6 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Crankshaft
| 04***28 | Key, Plain Woodruff | 1 |
| 04***24 | Pin,Dowel (For No.3 Housing) | 1 |
| 61***00 | Bearing Assembly | 1 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Cylinder Block Gasket Kit(#15707-)
| 04***12 | Lock (Kit) | 1 |
| 07***09 | O-Ring,(F4350-61a0 -33 ) | 3 |
| 07***12 | O-Ring, Between Valve And Pump | 1 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Cylinder Block(#15667-)
| 01***18 | Bolt | 6 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***25 | Washer,Spring?(Sandy And Dusty Spec.) | 6 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Cylinder Head
| 07***28 | O-Ring,(For Transmission Screen) | 2 |
| 07***08 | Plug (Kit) | 4 |
| 07***11 | Plug,(For Shipping) | 1 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Cylinder Head Gasket Kit(#15707-)
| 02***75 | O-Ring,(For Japan) (K1) | 4 |
| 02***81 | O-Ring,Air Connector | 2 |
| 07***28 | O-Ring,(For Transmission Screen) | 12 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Damper
| 61***00 | Damper | 1 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Engine Mounting(#15667-)
| 01***50 | Bolt | 8 |
| 01***45 | Washer,(Without R.O.P.S.) | 8 |
| 04***34 | Pin-Dowel, Pin,Dowel (For Shipping) | 4 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Engine Stop Motor(#15707-)
| 01***45 | Bolt | 3 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 1 |
| 01***20 | Bolt,(For Mono Lever Steering) | 1 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Exhaust Manifold(#15667-)
| 01***65 | Bolt | 2 |
| 01***90 | Bolt | 22 |
| 07***08 | Plug | 1 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Fan Belt (Except Japan)(#15667-)
| 04***68 | V-Belt Set | 1 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Fan Drive (Except Japan)(#15667-)
| 01***55 | Capscrew | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***45 | Bolt, Mounting Cranking Motor | 6 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Flywheel Housing(#15667-)
| 01***45 | Bolt, Mount Bracket | 4 |
| 01***55 | Bolt | 6 |
| 01***60 | Bolt,(Except Pll) | 2 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Flywheel(#15667-)
| 01***90 | Bolt | 10 |
| 61***20 | Washer, Plain (M20) | 10 |
| 61***20 | Gear | 1 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Front Cover(#15667-17480)
| 01***30 | Screw | 1 |
| 01***35 | Bolt | 4 |
| 01***40 | Capscrew | 8 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Front Cover(#17481-)
| 01***30 | Screw | 1 |
| 01***35 | Bolt | 4 |
| 01***40 | Capscrew | 8 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Front Power Take Off(#15667-)
| 01***25 | Bolt,(Rear Attachment Less) | 6 |
| 01***25 | Washer,Spring?(Sandy And Dusty Spec.) | 6 |
| 04***18 | Ring, Snap | 1 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Fuel Filter(#15707-18733)
| 01***65 | Capscrew | 1 |
| 01***20 | Bolt,(For Mono Lever Steering) | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 1 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Fuel Filter(#18734-)
| 01***65 | Capscrew | 1 |
| 01***20 | Bolt,(For Mono Lever Steering) | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 1 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Fuel Injection Pump (Coupling) (Inner Parts)(#15707-)
| ND***61 | Bolt | 6 |
| ND***30 | Nut,Flange | 2 |
| ND***20 | Flange | 1 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Fuel Injection Pump (Feed Pump) (Inner Parts)(#15707-)
| ND***40 | Washer? 1mm,Plate | 1 |
| ND***10 | Spring,Tappet | 1 |
| ND***70 | Washer,Union | 4 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Fuel Injection Pump (Governor) (1/2) (Inner Parts)(#15707-)
| ND***40 | Plate,Thrust | 1 |
| ND***60 | Shackle Ass'Y | 1 |
| ND***50 | Washer? 0.3mm | 0 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Fuel Injection Pump (Governor) (2/2) (Inner Parts)(#15707-)
| ND***20 | Washer? 1.0mm,Cover Plate | 2 |
| ND***20 | Bushing,Bearing | 1 |
| ND***70 | O-Ring | 1 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Fuel Injection Pump (Pump) (1/2) (Inner Parts)(#15707-)
| 61***42 | Injection Pump Ass'Y | 1 |
| 61***43 | Injection Pump Ass'Y | 1 |
| ND***10 | Nut | 1 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Fuel Injection Pump (Pump) (2/2) (Inner Parts)(#15707-)
| ND***40 | Washer | 12 |
| ND***30 | Spring,Plunger | 6 |
| ND***10 | Shim? 1.55mm | 0 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Fuel Injection Pump Drive
| 01***30 | Bolt,(With Body Positioner) | 4 |
| 01***35 | Bolt, Mount Ground Driven Steering Pump | 5 |
| 01***12 | Nut | 1 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Fuel Injection Pump Mounting(#15707-)
| 01***90 | Bolt,(For No?1 And No?3 Housing) | 4 |
| 61***30 | Pin,Dowel | 2 |
| (6***2) | Injection Pump Ass'Y,(See Fig.A4010-B6b2) | 1 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Fuel Return(#15707-)
| 01***20 | Bolt,(For Mono Lever Steering) | 1 |
| 01***70 | Bolt - Bracket And Oil Inlet Tubemounting | 1 |
| 01***30 | Bolt,For Weight Adjusting Bolt | 1 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Head Cover
| 01***55 | Bolt,(See Service News) | 28 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 28 |
| 01***16 | Washer,(With Shoe Slip Control) | 28 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Holder (Inner Parts)(#15667-16040)
| 61***11 | Holder Ass'Y | 6 |
| DK***00 | Shim? 0.80mm | 0 |
| DK***00 | Shim? 1.38mm | 0 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Holder (Inner Parts)(#15707-)
| 61***60 | Holder Ass'Y | 6 |
| ND***20 | Shim? 1.00mm | 0 |
| ND***10 | Shim? 1.95mm | 0 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Holder (Inner Parts)(#16041-)
| 61***11 | Holder Ass'Y | 6 |
| DK***00 | Shim? 0.80mm | 0 |
| DK***00 | Shim? 1.38mm | 0 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Idler Gear
| 01***35 | Bolt,(Not Shown) | 6 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 6 |
| 01***45 | Washer,(Without R.O.P.S.) | 3 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Injection Bracket And Piping(#15707-)
| 01***30 | Screw | 7 |
| 01***35 | Bolt | 3 |
| 01***35 | Bolt,(For Fix Position) | 2 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Injection Nozzle(#15667-16040)
| 07***14 | Tube, Spill | 5 |
| 07***80 | Clip | 10 |
| 61***02 | Nozzle Holder Ass'Y | 6 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Injection Nozzle(#15707-)
| 07***14 | Tube, Spill | 5 |
| 07***80 | Clip | 10 |
| 61***10 | Bolt,Nozzle Holder | 12 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Injection Nozzle(#16041-)
| 07***14 | Tube, Spill | 5 |
| 07***80 | Clip | 10 |
| 61***10 | Bolt,Nozzle Holder | 12 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Lubricating Oil Cooler (-30c? And -50c?)(#15667-)
| 01***20 | Bolt, Wiring Harness Mounting Bracket | 2 |
| 01***25 | Bolt,(Rear Attachment Less) | 6 |
| 01***65 | Capscrew | 3 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Lubricating Oil Cooler(#15667-)
| 01***20 | Bolt, Wiring Harness Mounting Bracket | 2 |
| 01***25 | Bolt,(Rear Attachment Less) | 6 |
| 01***65 | Capscrew | 3 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Lubricating Oil Filter(#15667-)
| 01***40 | Bolt,For Weight Adjusting Bolt | 2 |
| 01***45 | Bolt, Mounting Cranking Motor | 6 |
| 01***50 | Bolt,For Weight Adjusting Bolt | 2 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Lubricating Oil Pump
| 01***70 | Bolt - Bracket And Oil Inlet Tubemounting | 2 |
| 01***40 | Bolt,For Weight Adjusting Bolt | 4 |
| 01***50 | Bolt | 2 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Mechanical Pump(#15667-)
| 01***16 | Bolt (Welded) | 2 |
| 01***40 | Bolt,For Weight Adjusting Bolt | 1 |
| 01***05 | Capscrew | 4 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Muffler Ejector Piping(#15667-)
| 01***25 | Bolt,Joint | 6 |
| 01***35 | Capscrew | 1 |
| 01***16 | Washer,(With Shoe Slip Control) | 4 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Muffler Mounting(#15667-)
| 01***35 | Bolt | 1 |
| 01***75 | Bolt | 4 |
| 01***30 | Bolt | 2 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Name Plate And Caution (English)(#15667-)
| 04***50 | Screw | 4 |
| 09***30 | Plate? Name,(English) (Limited Supply) | 1 |
| 61***50 | Plate? Caution,(For Auto Primming System) | 2 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Name Plate And Caution (Indonesian)(#15667-)
| 04***50 | Screw | 4 |
| 09***30 | Plate? Name,(English) (Limited Supply) | 1 |
| 61***40 | Plate? Caution,(For Auto Primming System) | 2 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Name Plate And Caution (Spanish)(#15667-)
| 04***50 | Screw | 4 |
| 09***30 | Plate? Name,(English) (Limited Supply) | 1 |
| 61***91 | Plate? Instruction,(For Auto Primming System) | 2 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Oil Filler(#15667-)
| 01***30 | Bolt,(With Body Positioner) | 5 |
| 01***35 | Bolt,(F4320-52a0 -5 ) | 1 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 6 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Oil Gauge (-30c?)(#15707-)
| 07***12 | O-Ring, Between Valve And Pump | 1 |
| 61***31 | Gauge,Oil Level | 1 |
| 61***51 | Guide,Oil Gauge | 1 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Oil Gauge(#17709-)
| 07***12 | O-Ring, Between Valve And Pump | 1 |
| 61***31 | Gauge,Oil Level | 1 |
| 61***51 | Guide,Oil Gauge | 1 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Oil Pan And Suction Tube (-30c?)(#15707-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***30 | Bolt,(With Body Positioner) | 49 |
| 01***35 | Bolt,(F4320-52a0 -5 ) | 2 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Oil Pan And Suction Tube(#17709-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***30 | Bolt,(With Body Positioner) | 49 |
| 01***35 | Bolt,(F4320-52a0 -5 ) | 2 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Other Parts(#15707-)
| 04***33 | V-Belt | 1 |
| 04***68 | V-Belt Set | 1 |
| 60***31 | Cartridge, Oil Filter | 2 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Piston
| 02***13 | Pin, Dowel | 4 |
| 61***60 | Piston Ring Ass'Y, Per Cylinder | 6 |
| 61***20 | Piston | 6 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Power Take Off(#15667-)
| 01***60 | Bolt, Hanger Bearing Mounting | 10 |
| 01***30 | Bolt,(With Body Positioner) | 7 |
| 01***35 | Bolt,(F4320-52a0 -5 ) | 1 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Rocker Arm And Houning(#15667-17480)
| 01***55 | Bolt - Mount Cage To Transmission Case | 6 |
| 01***90 | Bolt,For Weight Adjusting Bolt | 36 |
| 01***15 | Bolt | 6 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Rocker Arm And Houning(#17481-)
| 01***55 | Bolt - Mount Cage To Transmission Case | 6 |
| 01***90 | Bolt,For Weight Adjusting Bolt | 36 |
| 01***15 | Bolt | 6 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Spare Parts (Except Japan)(#15667-)
| 04***33 | V-Belt | 1 |
| 04***68 | V-Belt Set | 1 |
| 60***31 | Cartridge, Oil Filter | 2 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Spare Parts (With Pre-Filter)(#15667-)
| 04***33 | V-Belt | 1 |
| 04***68 | V-Belt Set | 1 |
| 60***31 | Cartridge, Oil Filter | 2 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Starting Motor (7.5kw) (Inner Parts)(#15667-)
| 60***10 | Starting Motor Ass'Y,(7.5kw) | 2 |
| KD***20 | Magnetic Switch Assembly | 1 |
| KD***40 | Spring,Spring | 4 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Starting Motor Mounting (7.5kw)(#15667-)
| 01***45 | Bolt,(For Slag Handling) | 6 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 1 |
| 01***20 | Bolt,(Without Rops Guard? Canopy) | 2 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Tension Pulley(#15667-)
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 3 |
| 01***20 | Bolt, Wiring Harness Mounting Bracket | 2 |
| 01***20 | Bolt,(For Mono Lever Steering) | 1 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Turbocharger (Inner Parts)(#15667-)
| 01***16 | Bolt | 4 |
| 01***16 | Bolt | 8 |
| 04***08 | Pin, Dowel | 1 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Turbocharger Lubricating Oil Piping(#15667-)
| 01***16 | Bolt - Seat And Tether Belt Mounting | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***35 | Bolt,(F4320-52a0 -5 ) | 1 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Turbocharger Mounting(#15667-)
| 61***10 | Gasket,Turbocharger Mounting | 1 |
| 61***81 | Flange | 1 |
| 61***10 | Gasket,Turbocharger Mounting | 1 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Water Manifold
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 5 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 5 |
| 01***16 | Washer,Radio Controlled Slag Handling | 1 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Water Manifold And Thermostat(#15667-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 9 |
| 01***30 | Bolt,(With Body Positioner) | 3 |
| 01***95 | Capscrew | 6 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Water Pump Gasket Kit(#15707-)
| 07***45 | O-Ring - (K6) | 1 |
| 07***12 | O-Ring,(Extreme Cold Terrain Spec.) (K2) | 1 |
| 61***13 | Seal, Water - (K6) | 1 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Water Pump(#15667-18379)
| 01***20 | Bolt, Wiring Harness Mounting Bracket | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 1 |
| 01***30 | Bolt,(With Body Positioner) | 7 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Water Pump(#18380-)
| 01***20 | Bolt, Wiring Harness Mounting Bracket | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***30 | Bolt,(With Body Positioner) | 7 |
Komatsu : S6d170-1g-A(S/N 14674-Up) : Engine : Water Temperature(#15667-)
| 01***12 | Bolt - Front Cover Mounting | 1 |
| 01***20 | Bolt,(Without Rops Guard? Canopy) | 1 |
| 01***08 | Washer,(For 1 Attachment And Pat) | 1 |
S6D170-1G-A(S/N 14674-UP) serial number reference
The engine serial number plate is located on the engine block, typically on the left side near the injection pump. The prefix is the alphanumeric code at the start of the engine model designation (e.g., S6D170-1G-A), which identifies the engine family and specific configuration variant; the serial number (14674-UP) indicates the build sequence within that variant.
| Prefix | Identifies | Notes |
|---|---|---|
| S6D170-1G-A | Standard Configuration | Engine family S6D170-1G. Serial range 14674-UP. Confirmed in published references catalog for this specific engine model. |
| S6D170-1G-B | Low Temperature Spec | Serial range 14674-UP. Identified as -50°C spec. Confirmed in Fab Heavy Parts application list. |
| S6D170-1G-C | High Altitude Spec | Serial range 14674-UP. Identified as High Altitude Spec. Confirmed in Fab Heavy Parts application list. |
| S6D170-1G-R | Regional/Config Variant | Serial range 14674-UP. Listed in Fab Heavy Parts application list. Specific region not explicitly defined in the snippet, but grouped with other S6D170-1G variants. |
| S6D170-1G-W | Regional Variant | Serial range 14674-UP. Identified as for Canada / China / Chile / Russia. Confirmed by Fab Heavy Parts listing. |
Frequently asked questions
What is the engine designation for this machine?
The engine is designated as the Komatsu S6D170-1G-A.
What is the operating weight of the machine this engine powers?
Operating weight varies by configuration and series, typically ranging from 60,000 to 80,000 kg for the PC650-1 and PC1500-1 excavators.
What engine replaced the S6D170-1G-A?
The SAA6D170-2 series engine replaced the S6D170-1G-A in subsequent generations of Komatsu heavy excavators.
What S6D170-1G-A(S/N 14674-UP) owners discuss
What are the known powertrain and hydraulic behaviors for machines equipped with the S6D170-1G-A engine?
The S6D170-1G-A engine is typically found in large excavators such as the PC650-1 and PC1500-1. Community consensus indicates that Komatsu machines of this era are smooth to run and fuel efficient. A common diagnostic pattern is that if all hydraulic functions (boom, arm, bucket, swing, travel) become slow simultaneously, the issue is likely shared (hydraulic oil level, filters, engine RPM, or pump control) rather than a single cylinder failure. If only one function is slow, the focus shifts to that specific circuit, cylinder leakage, or control valve. Hydraulics that work well when cold but weaken when hot often indicate internal leakage in pumps, main control valves, or motors due to decreased oil viscosity at operating temperature. The engine is designed to handle heavy loads, but a loss of power under digging load often points to air/fuel restrictions or the hydraulic system placing excessive load on the engine rather than engine failure itself.
What undercarriage or wear patterns are typical for this machine type?
Operators note that the undercarriage on large Komatsu excavators is designed to wear out the complete machine simultaneously rather than individual components failing in isolation. Common wear patterns include track-chain elongation, roller degradation, and bushing wear. Worn-out bushings can lead to increased noise and vibration, while worn bearings may cause premature track failure. Track tension should be checked regularly, as repeated loosening often indicates issues with the tensioner or undercarriage component wear. Mud or debris packed into the undercarriage can cause mechanical binding and uneven wear.
What are the engine quirks per the S6D170-1G-A series?
The S6D170-1G-A is a 6-cylinder, turbocharged, liquid-cooled diesel engine. It is part of the 170 Series, which includes variants like S6D170-1A, S6D170-1D, and S6D170-1G. The S6D170-1G-A variant is specifically noted for serial numbers 14674 and up. The engine uses hardened liners matched to the piston rings. Common quirks include sensitivity to fuel quality and air intake restrictions; loss of power under load often requires checking air filters, fuel filters, and charge-air hoses before assuming engine failure. The cooling system is critical, and overheating during heavy excavation often indicates packed debris between heat exchangers (radiator, hydraulic oil cooler, charge-air cooler) rather than a coolant leak. The engine weight is approximately 1,700 kg. have your dealer verify the exact cooling system capacity and fan operation for your specific serial range.
What are common electrical or sensor issues reported by owners?
Komatsu excavators rely heavily on electronic control systems. Common electrical issues include intermittent starting, dashboard failures, and random shutdowns, often triggered by a single faulty sensor or unstable power supply. Fault codes such as CA115 indicate engine speed sensor faults, which can be caused by broken sensors, wiring issues, or connector corrosion. Multiple fault codes often point to battery state, ground connections, or connector integrity.
What should be checked when buying a used machine with the S6D170-1G-A engine?
When buying a used machine with this engine, verify the exact serial number to confirm the engine variant (S6D170-1G-A starts at serial 14674). Check the hydraulic system performance both cold and hot to identify internal leakage. Inspect the undercarriage for wear, track tension, and debris packing. Test the engine under load to ensure it maintains RPM and does not lose power. Check for fault codes, especially those related to the engine speed sensor and fuel system. Verify the condition of the cooling package, ensuring no debris is packed between the heat exchangers. Check the fuel filters and water separator for contamination.
What are the recommended fluids for this engine and machine?
Komatsu recommends using Komatsu Genuine fluids that meet 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. Specific fluid types like DEO, TDTO, ELC, or HYDO are often referenced in broader Komatsu contexts, but Komatsu Genuine fluids are formulated to exceed other standards. have your dealer verify the exact fluid specifications and capacities for your machine's configuration.
How does the S6D170-1G-A engine compare to related variants in terms of application?
The S6D170-1G-A engine is distinct from the S6D102E series and other 170 Series variants like S6D170-1A or S6D170-1D. It is specifically applied to machines with serial numbers 14674 and up, such as the PC650-1 and PC1500-1. The S6D170-1G-A is designed for high-altitude and specific regional specifications (Canada, China, Chile, Russia). The engine power output varies by configuration, with the 170 Series generally producing 550 to 700 hp depending on the modification. The working volume is 16.86 liters. have your dealer verify the exact power output and emissions tier for your specific machine serial number.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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