Komatsu S6D125-1B8-FA(S/N 10001-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu S6D125-1B8-FA is a 6-cylinder, turbocharged, and aftercooled diesel engine belonging to the S6D125 series. It powers mid-to-heavy class Komatsu construction equipment, including the PC200-7, PC220-7, PC300-7, and WA320-8 wheel loader series. Production years span the late 1990s through the 2010s. This engine succeeded the 6D125-1 and was later replaced by the S6D125E-2 and SAA6D125E-2 series to meet stricter emissions standards. Configurations offered include standard industrial, marine, and generator set variants, with the FA suffix denoting specific emission and application packages for the S/N 10001-UP range.
Across the S6D125 lineage, the primary change was the transition from mechanical fuel injection to electronic control systems in the E-series, improving fuel efficiency and reducing emissions. The S6D125-1B8-FA remains critical in the used and parts market because it is the heart of the highly popular PC200/PC220-7 excavator generation. Its widespread use ensures high parts availability, but the shift to electronic controls in later variants requires specialized diagnostic tools, making the mechanical simplicity of the 1B8-FA a preferred choice for independent rebuilds and long-term 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 S6D125-1B8-FA(S/N 10001-UP) specifications
Engine
| Model | S6D125-1B8-FA |
| Series/Generation | S6D125-1 (125 Series) |
| Type | 4-stroke, water-cooled, direct injection diesel engine |
| Displacement | 11.04 liters (674 cubic inches) |
| Cylinders | 6 |
| Bore x Stroke | 125 mm x 150 mm (4.92 inches x 5.91 inches) |
| Compression Ratio | 17:1 |
| Aspiration | Turbocharged and aftercooled |
| Power Output (Range) | 260–300 hp (194–224 kW); specific variant cited as 275 hp (205 kW) |
| Torque (Range) | 920–1100 Nm (678–811 lb-ft); specific variant cited as 1010 lb-ft (1370 Nm) |
| Emissions Tier | Not documented for this exact serial range — verify with your dealer |
Weights
| Operating Weight | Not documented for this exact serial range — verify with your dealer |
| Shipping Weight | Not documented for this exact serial range — verify with your dealer |
| Ground Pressure | Not documented for this exact serial range — verify with your dealer |
Dimensions
| Engine Dimensions (L x W x H) | 120 x 100 x 125 cm |
| Transport Length/Width/Height | Not documented for this exact serial range — verify with your dealer |
| Track Gauge / Wheelbase | Not documented for this exact serial range — verify with your dealer |
| Ground Clearance | Not documented for this exact serial range — verify with your dealer |
Performance
| Travel Speeds | Not documented for this exact serial range — verify with your dealer |
| Lift/Dig/Dump/Drawbar | 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.
S6D125-1B8-FA(S/N 10001-UP) fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with filter) | Not documented for this exact serial range | Komatsu Genuine Diesel Engine Oil, SAE 15W-40 for normal ambient temperatures; SAE 10W-30 for colder climates. Equivalent: Chevron Delo 400 series. |
| Cooling system | Not documented for this exact serial range | Komatsu Super Coolant, supplied as concentrate mixed 50/50 with water. |
| Fuel tank | Not documented for this exact serial range | Automotive diesel fuel (ASTM D975 No. 2-D equivalent) for normal conditions; lighter No. 1-D-equivalent in cold weather. |
| Transmission/powertrain compartments | Not documented for this exact serial range | Komatsu Powertrain & Micro Clutch Oil (drive-train fluid spec): SAE 10W in cold conditions, SAE 30 in normal/warm conditions. Equivalent: Chevron Delo TorqForce. |
| Final drives (each) | Not documented for this exact serial range | Komatsu Powertrain & Micro Clutch Oil (SAE 10W cold / SAE 30 normal), unless periodic maintenance chart calls out Komatsu Gear Lubricant (SAE 80W-90 or 85W-140, API GL-5 class). |
| Hydraulic system and tank | Not documented for this exact serial range | Komatsu hydraulic oil (46AW hydraulic fluid spec), ISO VG 46. Equivalent: Chevron Rando HD or Delo TorqForce hydraulic-oil equivalents in ISO 46 grade. |
| Grease (spec only) | Not applicable | Komatsu Lithium-base Grease EP2 (G2-LI), NLGI 2, general-purpose chassis grease for normal temperatures. Equivalent: Chevron/Delo Grease ESI EP, NLGI 2. Use lower-consistency (arctic-grade) NLGI 1 or 0.5 lithium grease in sustained sub-freezing climates. |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Komatsu S6D125-1B8-FA(S/N 10001-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 S6D125-1B8-FA(S/N 10001-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize KOWA fluid analysis at every 500-hour interval to monitor engine wear metals (iron, copper, lead) and coolant contaminants (sodium, silicon). Track hydraulic oil particle count and viscosity to predict pump and valve wear. Monitor DEF levels and quality to prevent SCR system faults. Use KOMTRAX telematics to track load frequency and fuel burn anomalies, identifying inefficient combustion or turbocharger degradation before catastrophic failure occurs.
Corrective & Common Repairs
Address common S6D125-1B8-FA issues by inspecting the turbocharger TV7705 for shaft play and oil leaks. Check the fuel injection pump TVC (Traveling Valve Control) setting, as improper adjustment causes power loss and excessive smoke. Replace worn piston rings if oil consumption exceeds limits or breather pressure is high. Inspect the water pump and thermostat housing for coolant leaks, a frequent source of overheating. Verify electrical connections to the engine controller to prevent intermittent stalling or fault codes.
Overhaul & Rebuild Points
Plan inframe overhauls around 10,000-12,000 hours or when compression drops below spec. Replace pistons, liners, and rings using the S6D125-1 specific kit. Inspect the crankshaft for journal wear and replace main and rod bearings if clearance exceeds limits. Check the cylinder head for warpage and replace valve guides and seats if leakage is detected. Rebuild the turbocharger or replace it if shaft end-play is excessive. Ensure all gaskets and seals are replaced during reassembly to prevent oil and coolant mixing.
Seasonal & Environment Servicing
In cold climates, use low-temperature Komatsu diesel engine oil and ensure the coolant mixture provides adequate freeze protection. Check the battery heating blanket and insulation for cold-start reliability. In dusty environments, inspect the air filter restriction indicator more frequently and clean the radiator and oil cooler fins daily to prevent overheating. In high-humidity or coastal areas, inspect electrical connectors for corrosion and check the fuel separator for water accumulation more often to prevent injector damage.
S6D125-1B8-FA(S/N 10001-UP) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 07281-00197 | Clamp,(With Pre-Fuel Filter) | Fuel system service | Check fitment → |
| 600-311-8291 | Cartridge,Fuel Filter | Fuel system service | Check fitment → |
| 6114-71-6200 | Fuel Filter Ass'Y | Fuel system service | Check fitment → |
| 6114-71-6210 | Head, Fuel Filter | Fuel system service | Check fitment → |
| 6162-53-5430 | Packing,Oil Filter And Piping | Lubrication service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
S6D125-1B8-FA(S/N 10001-UP) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| CA115 | Engine speed sensor and backup speed sensor failure | Broken sensor, wiring issue, or connector corrosion | Replace the speed sensor and verify the voltage at the pin connector |
| CA111 | Internal engine controller fault | ECM hardware or software failure | Replace or reprogram the ECM |
| 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 |
| CA452 | Common rail pressure sensor feedback value too low | Fuel leak, sensor failure, or supply pump issue | Diagnose the fuel rail pressure sensor or pump lines |
| CA122 | Intake air pressure sensor feedback voltage too high | Sensor malfunction or wiring short | 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 |
| CA234 | Engine overspeed | Throttle calibration error, engine load cycle issue, or operator misuse | Verify throttle calibration, engine load cycle, or operator misuse |
| CA441 | Battery voltage too low | Weak battery, alternator failure, or loose connections | Replace the alternator or battery; check the voltage regulator |
| CA442 | Battery voltage too high | Alternator regulator failure | Replace the alternator or battery; check the voltage regulator |
| CA2311 | IMV solenoid valve failure | Faulty IMV solenoid or wire harness issue | Replace the IMV solenoid or inspect the wire harness |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
S6D125-1B8-FA(S/N 10001-UP) attachments & work tools
Bulldozer Blade Configurations
The S6D125-1B8-FA engine powers the D65E-12 and D65PX-12 series dozers, which utilize semi-U or U-blade configurations with capacities varying by configuration/series. Factory guarding options include heavy-duty side cutters and corner guards for high-abrasion applications, as documented in the Komatsu shop manual for this range.
Excavator Bucket Families
This engine is fitted to the PC400-5 and PC400LC-5 excavator series, supporting standard heavy-duty digging buckets and rock buckets. Bucket capacities vary by configuration/series, typically ranging from 2.0 to 3.0 cubic meters for this class, with mounting systems compatible with the machine's standard quick-coupler interface.
Wheel Loader Bucket Types
The S6D125-1B8-FA engine is used in the WA470-3 and WA480-8 wheel loaders, which are equipped with general purpose, light material, and heavy-duty rock buckets. Typical bucket capacities for this class range from 3.0 to 4.0 cubic meters, depending on the specific loader model and configuration.
Hydraulic System Requirements
Work tools require connection to the machine's main hydraulic circuit; the engine itself does not provide direct tool hydraulics but drives the hydraulic pump. Komatsu recommends using Komatsu Hydraulic Oil (HO) or equivalent for the system, as specified in the operation and maintenance manual.
Engine Mounting and Coupling
The engine is mounted via a rigid frame interface with flywheel housing standards compatible with the PC400-5 and D65E-12 chassis. The S/N 10001-UP designation indicates a specific production series with standardized mounting bolt patterns and alignment tolerances as per the factory spec sheet.
All S6D125-1B8-FA(S/N 10001-UP) assemblies by section
Every catalogued assembly group for the Komatsu S6D125-1B8-FA(S/N 10001-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Engine
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Air Compressor (Inner Parts)(#22230-41920)
| 61***10 | Air Compressor Ass'Y,(See Fig.0711) | 1 |
| DK***20 | Connecting Rod A | 1 |
| DK***00 | Spring,Delivery Valve | 1 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Air Compressor (Inner Parts)(#41921-)
| 61***11 | Air Compressor Ass'Y,(See Fig.0711a) | 1 |
| DK***20 | Connecting Rod A | 1 |
| DK***00 | Spring,Delivery Valve | 1 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Air Compressor And Piping(#22230-)
| 07***12 | Gasket,(Without Air Compressor Type) (K2) | 4 |
| 07***12 | Gasket,(Without Air Compressor Type) (K1) | 8 |
| 07***16 | Gasket,Air Compressor Piping | 2 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Air Intake Manifold And Connection(#16790-)
| 01***10 | Bolt,(With Auto Emergency Steering) | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 16 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Alternator (35a) (Inner Parts)
| 60***60 | Alternator A. (35a),(With Non Hardening Pulley) | 1 |
| KD***57 | Bearing,Ball? Front | 1 |
| KD***80 | Collar | 1 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Alternator And Mounting (35a)(#22230-)
| 01***40 | Bolt, Mount Master Brake Cylinder | 1 |
| 01***30 | Bolt | 1 |
| 01***23 | Washer,(A)(W/After Cooler)(S6d155-4b) | 2 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Camshaft
| 01***22 | Bolt | 2 |
| 04***25 | Key, Plain Woodruff | 1 |
| 04***12 | Ring,Snap (For Ripper) | 2 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Cooling Fan And Mounting(#22230-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 6 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 6 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Corrosion Resistor And Piping(#32964-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 5 |
| 01***08 | Nut,(For Canvas Canopy?Head Guard) | 1 |
| 02***25 | Bolt,(Cold Weather Spec.) | 4 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Crankshaft(#22230-)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 6 |
| 01***30 | Screw | 1 |
| 01***35 | Screw | 5 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Cylinder Block Cover(#22230-)
| 07***20 | Clamp, Spring Hose | 1 |
| 07***63 | Hose | 1 |
| 61***90 | O-Ring,Breather | 1 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Cylinder Block(#22230-)
| 01***12 | Bolt,(Without Air Compressor Type) | 2 |
| 01***45 | Washer,(For Travel Motor) (Not Show) | 14 |
| 04***14 | Pin, Dowel | 2 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Cylinder Head(#22230-)
| 04***20 | Pin,Dowel (Welded) | 2 |
| 61***30 | Sleeve,Holder | 1 |
| 61***20 | Cotter, Valve | 48 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Exhaust Brake (Inner Parts)(#22230-74356)
| 61***50 | Exhaust Brake Ass'Y | 1 |
| 61***51 | Exhaust Brake Ass'Y | 1 |
| JK***47 | Bushing | 1 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Exhaust Brake (Inner Parts)(#74357-)
| 61***51 | Exhaust Brake Ass'Y | 1 |
| MY***74 | Pin | 2 |
| MY***08 | Nut | 2 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Exhaust Brake(#22230-)
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Exhaust Manifold And Turbocharger(#22230-)
| 01***00 | Bolt (M10-1.50x100) | 18 |
| 01***45 | Screw | 2 |
| 07***08 | Plug,(Without Auto Priming System) | 1 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Flywheel And Flywheel Housing(#22230-)
| 01***50 | Bolt | 2 |
| 01***50 | Bolt, Radiator To Frame | 6 |
| 01***60 | Bolt, Hanger Bearing Mounting | 2 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Front Cover(#22230-)
| 01***25 | Bolt,(Without Auto Priming System) | 6 |
| 01***60 | Screw | 1 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Fuel Filter And Piping(#22230-)
| 01***90 | Bolt, Fan Mounting | 2 |
| 01***16 | Washer,Radio Controlled Slag Handling | 2 |
| 07***12 | Gasket,Mechanical Pump Piping | 2 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Fuel Injection Pump (Coupling) (Inner Parts)(#22230-)
| DK***00 | Nut | 2 |
| DK***00 | Bolt | 4 |
| DK***00 | Bolt | 2 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Fuel Injection Pump (Feed Pump) (Inner Parts)(#22230-)
| DK***20 | Bolt, Joint | 1 |
| DK***00 | Valve,Check | 2 |
| DK***80 | Feed Pump Ass'Y | 1 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Fuel Injection Pump (Governor) (1/2) (Inner Parts)(#22230-)
| DK***80 | Bolt,Eye | 1 |
| DK***00 | Nut | 1 |
| DK***00 | Spring | 1 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Fuel Injection Pump (Governor) (2/2) (Inner Parts)(#22230-)
| DK***00 | Screw | 1 |
| DK***20 | Lever | 1 |
| DK***00 | Bushing | 1 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Fuel Injection Pump (Pump) (Inner Parts)(#22230-)
| 61***20 | Injection Pump Ass'Y | 1 |
| DK***30 | Bearing,Roller | 2 |
| DK***00 | Shim? 0.875mm | 0 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Fuel Injection Pump (Timer) (Inner Parts)(#22230-)
| DK***00 | Bolt | 2 |
| DK***00 | Roller? 23.9mm | 0 |
| DK***40 | Timer Ass'Y | 1 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Fuel Injection Pump And Piping(#22230-)
| 01***30 | Bolt | 4 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***45 | Bolt,(For Power Tilt Mech Angle) | 2 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Fuel Nozzle And Spill Pipe(#22313-)
| 01***45 | Bolt, Divider Valve Mounting | 12 |
| 07***65 | O-Ring,Cylinder Block | 6 |
| 07***12 | Gasket,Mechanical Pump Piping | 2 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Gasket Kit(#22230-)
| 02***43 | O-Ring,Water Manifold | 6 |
| 07***20 | O-Ring,Relief Valve | 1 |
| 07***15 | O-Ring,(For Low Speed) (D40pf) | 1 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Head Cover
| 01***16 | Washer,Radio Controlled Slag Handling | 24 |
| 61***10 | Cover,Head? No.2?3?4?5?6 | 6 |
| 61***11 | Cover,Head? No.2?3?4?5?6 | 6 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Lubricating Oil Cooler(#22230-)
| 01***25 | Bolt,Without Revolution Sensor | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 12 |
| 01***65 | Bolt,(Except Japan) | 2 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Lubricating Oil Filter And Mounting(#22230-)
| 01***60 | Bolt, Mount Tube To Switch Pump | 1 |
| 01***75 | Bolt,(For Adjusting) | 4 |
| 01***16 | Washer,Radio Controlled Slag Handling | 5 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Lubricating Oil Pump And Suction Pipe(#22230-)
| 01***25 | Bolt,(Without Auto Priming System) | 4 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 2 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 5 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Oil Pan(#22230-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 29 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 7 |
| 01***16 | Washer,Radio Controlled Slag Handling | 37 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Piston And Connecting Rod(#11574-)
| 02***13 | Pin, Dowel | 2 |
| 04***18 | Ring, Snap | 12 |
| 61***31 | Piston Ring Ass'Y | 6 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Rocker Arm
| 01***08 | Nut,R.H. Thread | 12 |
| 01***16 | Washer,Radio Controlled Slag Handling | 40 |
| 01***32 | Washer,(With Auto Emergency Steering) | 40 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Starting Motor (7.5kw) (Inner Parts) -1c?1b8)(#18200-)
| 60***30 | Starting Motor Ass'Y,(7.5kw) | 1 |
| KD***60 | Shift Lever Assembly | 1 |
| KD***40 | Spring,Spring | 4 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Starting Motor Mounting (7.5kw)
| 01***60 | Bolt,(Shim Thickness?More Than 8mm) | 3 |
| 66***10 | Gasket,Starting Motor | 1 |
| (6***0) | Starting Motor Ass'Y,(7.5kw) (See Fig.0661a) | 1 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Turbocharger (Inner Parts)(#22230-)
| 61***00 | Turbocharger Ass'Y,(See Fig.0155) | 1 |
| GA***85 | V-Band Ass'Y | 1 |
| GA***07 | Rotor Ass'Y | 1 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Turbocharger Libricating Oil Piping(#22230-)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 6 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***40 | Bolt, Mount Master Brake Cylinder | 1 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Water Manifold(#22230-)
| 02***43 | O-Ring,Water Manifold | 6 |
| 07***12 | Washer, Gasket,(Without Thermo Sensor) (K1) | 1 |
| 07***15 | Plug,(Used When Without Heater) | 1 |
Komatsu : S6d125-1b8-Fa(S/N 10001-Up) : Engine : Water Pump And Mounting(#22230-)
| 01***30 | Bolt,(For France Noise Suppression) | 2 |
| 01***16 | Bolt (With Air Heater & Conditioner) | 6 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
S6D125-1B8-FA(S/N 10001-UP) serial number reference
The engine serial plate is stamped on the engine block, typically on the left side near the injection pump. Read the prefix as the equipment model code (e.g., HA250) followed by the dash-number generation, then match the engine serial number to the catalog range.
| Prefix | Identifies | Notes |
|---|---|---|
| HA250-1 | Dumper | Equipment model HA250-1. Engine serial 22230-Up. Years not documented for this exact serial range — verify with your dealer |
| HA250-3 | Dumper | Equipment model HA250-3. Engine serial 22230-Up. Years not documented for this exact serial range — verify with your dealer |
Frequently asked questions
What is the engine type and series for the S6D125-1B8-FA?
It is a 6-cylinder, turbocharged, and aftercooled diesel engine from the Komatsu S6D125 series, specifically the 1B8-FA variant for serial numbers 10001-UP.
What is the operating weight of the machines powered by this engine?
Operating weight varies by configuration and series. For example, the PC200-7 excavator ranges from approximately 20,000 to 22,000 lbs, while the WA320-8 wheel loader ranges from 34,000 to 35,000 lbs.
What engine replaced the S6D125-1B8-FA?
The S6D125E-2 and SAA6D125E-2 series replaced the S6D125-1B8-FA to meet stricter emissions standards, featuring electronic fuel injection and advanced aftertreatment systems.
What S6D125-1B8-FA(S/N 10001-UP) owners discuss
What are the typical powertrain and hydraulic behaviors associated with the Komatsu S6D125-1B8-FA engine series?
What undercarriage or wear patterns are typical for machines powered by this engine series?
What are the known engine quirks or maintenance requirements for the S6D125-1B8-FA series?
What are the common electrical or sensor issues reported for this engine?
What should be checked when buying a used machine with the S6D125-1B8-FA engine?
What are the fluid specifications for the S6D125-1B8-FA engine and associated systems?
What safety-critical fixes or inspections are recommended for the S6D125-1B8-FA engine?
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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