Komatsu SA6D125-1Q(S/N 28389-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu SA6D125-1Q is a turbocharged, aftercooled diesel engine belonging to the 125 Series, manufactured from approximately 2011 onward. It powers mid-to-heavy class construction equipment, including the PC400-6 and WA470-3, with operating weights ranging from 34,000 to 52,000 lb (15,422 to 23,587 kg). The engine delivers 275 hp (205 kW) and 1,010 lb-ft (1,370 Nm) of torque. It succeeded the naturally aspirated 6D125-1 and was later replaced by the SAA6D125E-2 series to meet Tier 4 Final emissions standards.
The SA6D125-1Q remains critical in the used and parts market due to its widespread installation in the PC400-6 and WA470-3 platforms. Its robust block design and hardened liners allow for extended service life, making it a preferred choice for remanufacturing. The engine's compatibility with Komatsu's KOWA fluid analysis program and KOMTRAX telematics ensures predictable maintenance, sustaining high residual value for machines equipped with this powertrain.
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 SA6D125-1Q(S/N 28389-UP) specifications
Engine
| Model | SA6D125-1Q |
| Series | 125 Series (125-1) |
| Configuration | Turbocharged, Aftercooled Diesel |
| Displacement | 11 L (672 cu in) |
| Cylinders | 6 |
| Gross Power | 275 hp (205 kW) |
| Torque | 1,010 lbf·ft (1,370 N·m) |
| 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
| Transport Length | Not documented for this exact serial range — verify with your dealer |
| Transport Width | Not documented for this exact serial range — verify with your dealer |
| Transport Height | Not documented for this exact serial range — verify with your dealer |
| Track Gauge | 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 Speed | Not documented for this exact serial range — verify with your dealer |
| Gradeability | Not documented for this exact serial range — verify with your dealer |
| Dig/Dump/Lift | 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 SA6D125-1Q(S/N 28389-UP) maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
| Every 4,000 h |
|
Servicing the SA6D125-1Q(S/N 28389-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize Komatsu Oil/Wear Analysis (KOWA) at every 500-hour interval to monitor engine wear metals and coolant condition. The SA6D125-1Q's hardened cylinder liners and high-pressure Bosch-style fuel system require strict adherence to Komatsu EO/TO diesel engine oil specifications. Analyze fuel dilution levels to detect piston ring wear early. Track coolant pH and inhibitor levels to prevent cavitation erosion in the SA6D125-1Q's wet liner design. Use KOMTRAX telematics to correlate load frequency with fluid degradation rates for optimized change intervals.
Corrective & Common Repairs
Address intermittent starting or random shutdowns by inspecting the engine controller power supply and sensor wiring harnesses. Replace faulty coolant temperature or intake air temperature sensors if fault codes CA144, CA153, or CA154 appear. Repair fuel leaks at injector lines by replacing copper sealing washers and tightening to factory torque. Inspect the turbocharger compressor wheel for shaft play and replace if excessive. Clean the aftercooler core to restore airflow and prevent overheating under heavy load.
Overhaul & Rebuild Points
Perform an in-frame overhaul at 10,000 hours or when compression drops below specification. Replace piston rings, cylinder liners, and bearings using the Komatsu SA6D125 overhaul kit. Inspect the crankshaft for journal wear and grind if necessary. Replace the fuel injection pump if fuel delivery pressure fails to meet standards. Rebuild the turbocharger with new bearings and seals. Verify valve clearance and adjust tappets to specification during the overhaul process.
Seasonal & Environment Servicing
In cold climates, use Komatsu Super-coolant AF-NAC rated for -35°C to prevent freezing and ensure proper heat transfer. Install block heaters and oil pan heaters for temperatures below -10°C. In dusty environments, inspect the air cleaner indicator more frequently and replace the primary and secondary elements as needed. Drain the fuel water separator daily to prevent microbial growth in humid conditions. Inspect the radiator and aftercooler fins for debris buildup to maintain optimal cooling efficiency.
SA6D125-1Q(S/N 28389-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 → |
| 6125-81-7032 | Element Ass'Y,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.
SA6D125-1Q(S/N 28389-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 |
| CA111 | Internal engine controller fault | ECM internal abnormality | Replace or reprogram the ECM |
| CA441 | Battery voltage too low | Alternator or battery failure | Replace the alternator or battery and check the voltage regulator |
| CA442 | Battery voltage too high | Alternator or voltage regulator failure | Replace the alternator or battery and check the voltage regulator |
| CA122 | Intake air pressure sensor high voltage | Sensor malfunction or wiring issue | Verify the intake pressure sensor and wiring |
| CA123 | Intake air pressure sensor low voltage | Sensor short or airflow restriction | Check for a sensor short or an airflow restriction |
| CA153 | Intake air temperature sensor high voltage | Sensor malfunction | Replace or test the IAT sensor |
| CA154 | Intake air temperature sensor low voltage | Sensor malfunction | Replace or test the IAT sensor |
| CA451 | Common rail pressure sensor feedback value too high | Fuel rail sensor malfunction or actual overpressure condition | Diagnose the fuel rail pressure sensor or pump lines |
| CA452 | Common rail pressure sensor feedback value too low | Fuel rail sensor malfunction or low pressure condition | Diagnose the fuel rail pressure sensor or pump lines |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
SA6D125-1Q(S/N 28389-UP) attachments & work tools
Bulldozer Blade Configurations
The SA6D125-1Q engine (S/N 28389-UP) is factory-equipped in the D135A-2 dozer series. Typical blade options for this class include semi-U (SU) and universal (U) configurations, with capacities varying by configuration/series based on the specific dozer model assignment.
Excavator Bucket Families
This engine powers the PC400LC-3 series excavators. Standard work tools include heavy-duty rock buckets and general-purpose earthmoving buckets. Capacities vary by configuration/series depending on the specific bucket width and depth selected for the PC400LC-3 frame.
Wheel Loader Bucket Types
The SA6D125-1Q is associated with the WA470-3 wheel loader model. Primary work tools include general-purpose (GP) buckets for earthmoving and rock buckets for heavy excavation. Bucket capacities vary by configuration/series to match the loader's lift arm geometry and hydraulic flow.
Hydraulic Coupler/Mounting Systems
Excavator and loader attachments utilize Komatsu’s standard quick coupler systems designed for the PC400 and WA470 frame mounting points. Dozer blades are mounted via the dozer’s proprietary lift arm and blade pin interfaces, requiring specific guarding for the hydraulic lines.
Hydraulic Kit Requirements
High-flow attachments such as heavy-duty breakers or large-diameter augers require auxiliary hydraulic kits. These kits typically include high-flow solenoid valves and reinforced hose assemblies to match the engine’s hydraulic pump output specifications.
Factory Guarding Options
Factory configurations often include heavy-duty undercarriage guards for dozers and rock shields for loader buckets. Excavator models may offer factory-installed rock guards for the boom and stick to protect hydraulic cylinders and hoses in abrasive environments.
All SA6D125-1Q(S/N 28389-UP) assemblies by section
Every catalogued assembly group for the Komatsu SA6D125-1Q(S/N 28389-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Cooling System
Komatsu : Sa6d125-1q(S/N 28389-Up) : Cooling System : Cooling Fan And V-Belt
| 04***78 | V-Belt Set,(Ec. Noise Suppression Spec.) | 1 |
| 60***60 | Fan,Cooling | 1 |
Komatsu : Sa6d125-1q(S/N 28389-Up) : Cooling System : Corrosion Resistor And Piping
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***08 | Nut,(For Canvas Canopy?Head Guard) | 1 |
Komatsu : Sa6d125-1q(S/N 28389-Up) : Cooling System : Tension Pulley
| 01***16 | Bolt (Welded) | 4 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***95 | Bolt,(For 2nd Travel Speed) (Op) | 2 |
Komatsu : Sa6d125-1q(S/N 28389-Up) : Cooling System : Water Bypass Piping
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 1 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
Komatsu : Sa6d125-1q(S/N 28389-Up) : Cooling System : Water Pump
| 01***16 | Bolt (With Air Heater & Conditioner) | 6 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***10 | Bolt, Fan Mounting | 3 |
Cylinder Block
Komatsu : Sa6d125-1q(S/N 28389-Up) : Cylinder Block : Camshaft
| 01***22 | Bolt | 2 |
| 04***25 | Key, Plain Woodruff | 1 |
| 04***12 | Ring,Snap (For Ripper) | 12 |
Komatsu : Sa6d125-1q(S/N 28389-Up) : Cylinder Block : Crankshaft
| 01***45 | Bolt | 6 |
| 01***80 | Screw | 1 |
| 01***85 | Screw | 5 |
Komatsu : Sa6d125-1q(S/N 28389-Up) : Cylinder Block : Cylinder Block
| 01***12 | Bolt,(Without Air Compressor Type) | 2 |
| 01***45 | Washer,(For Travel Motor) (Not Show) | 14 |
| 04***14 | Pin, Dowel | 2 |
Komatsu : Sa6d125-1q(S/N 28389-Up) : Cylinder Block : Cylinder Block Cover
| 01***16 | Bolt (With Air Heater & Conditioner) | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***00 | Bolt, Mount Back-Up Alarm | 2 |
Komatsu : Sa6d125-1q(S/N 28389-Up) : Cylinder Block : Flywheel And Flywheel Housing
| 01***50 | Bolt | 2 |
| 01***50 | Bolt, Radiator To Frame | 4 |
| 01***50 | Bolt | 8 |
Komatsu : Sa6d125-1q(S/N 28389-Up) : Cylinder Block : Front Cover And Gear
Komatsu : Sa6d125-1q(S/N 28389-Up) : Cylinder Block : Oil Pan
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 31 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 7 |
| 01***16 | Washer,Radio Controlled Slag Handling | 37 |
Komatsu : Sa6d125-1q(S/N 28389-Up) : Cylinder Block : Piston And Connecting Rod
| 02***13 | Pin, Dowel | 2 |
| 04***18 | Ring, Snap | 12 |
| 61***32 | Piston Ring Ass'Y | 6 |
Komatsu : Sa6d125-1q(S/N 28389-Up) : Cylinder Block : Power Take Off
| 01***30 | Bolt,(For France Noise Suppression) | 5 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 2 |
| 01***30 | Bolt,Radio Controlled Slag Handling | 12 |
Cylinder Head
Komatsu : Sa6d125-1q(S/N 28389-Up) : Cylinder Head : After Cooler Piping
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 1 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
Komatsu : Sa6d125-1q(S/N 28389-Up) : Cylinder Head : Air Cleaner
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***40 | Bolt, Mount Master Brake Cylinder | 4 |
| 01***35 | Bolt, Mount Bracket To Floor | 2 |
Komatsu : Sa6d125-1q(S/N 28389-Up) : Cylinder Head : Air Intake Manifold And After Cooler
| 01***10 | Bolt,(With Auto Emergency Steering) | 2 |
| 01***90 | Bolt, Priority Valve Mounting | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
Komatsu : Sa6d125-1q(S/N 28389-Up) : Cylinder Head : Cylinder Head
| 04***20 | Pin,Dowel (Welded) | 2 |
| 61***30 | Sleeve,Holder | 1 |
| 61***20 | Cotter, Valve | 48 |
Komatsu : Sa6d125-1q(S/N 28389-Up) : Cylinder Head : Exhaust Manifold And Turbocharger
| 01***80 | Bolt, Mount Strainer Flange | 2 |
| 01***00 | Bolt (M10-1.50x100) | 16 |
| 01***45 | Screw | 4 |
Komatsu : Sa6d125-1q(S/N 28389-Up) : Cylinder Head : Muffler
| 01***40 | Bolt,(Dust And Dirt Protection) | 4 |
| 01***55 | Bolt,(For Suction? Reversible Fan) | 4 |
| 01***30 | Bolt,Radio Controlled Slag Handling | 4 |
Komatsu : Sa6d125-1q(S/N 28389-Up) : Cylinder Head : Rocker Arm And Housing
| 01***95 | Bolt,(For 2nd Travel Speed) (Op) | 2 |
| 01***08 | Nut,R.H. Thread | 12 |
| 01***16 | Washer,(With Shoe Slip Control) | 34 |
Komatsu : Sa6d125-1q(S/N 28389-Up) : Cylinder Head : Rocker Arm Housing Cover
| 01***16 | Washer,Radio Controlled Slag Handling | 24 |
| 61***11 | Cover,Head? No.2?3?4?5?6 | 6 |
| 61***10 | Gasket,Cylinder Head Cover | 6 |
Komatsu : Sa6d125-1q(S/N 28389-Up) : Cylinder Head : Turbocharger
| 61***00 | Turbocharger Ass'Y,(Tv7705) | 1 |
| GA***07 | Rotor Ass'Y | 1 |
| GA***85 | V-Band | 1 |
Komatsu : Sa6d125-1q(S/N 28389-Up) : Cylinder Head : Water Manifold And Thermostat
| 02***43 | O-Ring,Water Manifold | 6 |
| 07***12 | Washer, Gasket,(Without Thermo Sensor) (K1) | 1 |
| 07***15 | Plug,(Used When Without Heater) | 1 |
Electrical System
Komatsu : Sa6d125-1q(S/N 28389-Up) : Electrical System : Alternator (35a)
| 60***60 | Alternator A. (35a) | 1 |
| KD***57 | Bearing,Ball? Front | 1 |
| KD***60 | Pulley,Non Hardening | 1 |
Komatsu : Sa6d125-1q(S/N 28389-Up) : Electrical System : Alternator And Mounting
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
| 01***30 | Bolt | 1 |
| 01***23 | Washer,(A)(W/After Cooler)(S6d155-4b) | 2 |
Komatsu : Sa6d125-1q(S/N 28389-Up) : Electrical System : Starting Motor (7.5kw)
| 60***10 | Starting Motor Ass'Y,(7.5kw) | 1 |
| KD***20 | Magnetic Switch Assembly | 1 |
| KD***40 | Spring,Spring | 4 |
Komatsu : Sa6d125-1q(S/N 28389-Up) : Electrical System : Starting Motor And Mounting
| 01***45 | Bolt,(For Travel Motor) (Not Show) | 3 |
| 01***45 | Washer, Spring | 3 |
| 60***20 | Clip,(Large Capacity Type) | 1 |
Fuel System
Komatsu : Sa6d125-1q(S/N 28389-Up) : Fuel System : Fuel Filter And Piping
| 01***16 | Bolt - Starting Motor Ground Cable | 1 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 5 |
| 01***08 | Nut,See Fig. K4010-04a0 | 1 |
Komatsu : Sa6d125-1q(S/N 28389-Up) : Fuel System : Fuel Injection Pump (Coupling)
| DK***00 | Coupling,Cross | 1 |
| DK***60 | Coupling Ass'Y | 1 |
| DK***00 | Nut | 2 |
Komatsu : Sa6d125-1q(S/N 28389-Up) : Fuel System : Fuel Injection Pump (Feed Pump)
| DK***20 | Bolt, Joint | 1 |
| DK***00 | Valve,Check | 2 |
| DK***30 | Eye,Joint | 1 |
Komatsu : Sa6d125-1q(S/N 28389-Up) : Fuel System : Fuel Injection Pump (Governor) (1/2)
| DK***20 | Flyweight Ass'Y | 1 |
| DK***00 | Shim? 2.00mm,(High Altitude Spec.) | 0 |
| DK***00 | Nut,Lock | 1 |
Komatsu : Sa6d125-1q(S/N 28389-Up) : Fuel System : Fuel Injection Pump (Governor) (2/2)
| DK***80 | Shim? 0.5mm | 0 |
| DK***00 | Washer,Spring | 1 |
| DK***00 | Nut,Cap | 1 |
Komatsu : Sa6d125-1q(S/N 28389-Up) : Fuel System : Fuel Injection Pump (Pump)
| 61***30 | Injection Pump A | 1 |
| DK***30 | Bearing,Roller | 2 |
| DK***00 | Bearing, Center | 1 |
Komatsu : Sa6d125-1q(S/N 28389-Up) : Fuel System : Fuel Injection Pump And Piping
| 01***30 | Bolt | 4 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 6 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
Komatsu : Sa6d125-1q(S/N 28389-Up) : Fuel System : Fuel Nozzle And Spill Pipe
| 01***45 | Bolt, Divider Valve Mounting | 12 |
| 07***65 | O-Ring,Cylinder Block | 6 |
| 07***12 | Gasket,Mechanical Pump Piping | 2 |
Lubricating Oil System
Komatsu : Sa6d125-1q(S/N 28389-Up) : Lubricating Oil System : Lubricating Oil Cooler
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 12 |
| 01***40 | Bolt, Mount Master Brake Cylinder | 1 |
| 01***75 | Bolt,(For Adjusting) | 2 |
Komatsu : Sa6d125-1q(S/N 28389-Up) : Lubricating Oil System : Lubricating Oil Filter
| 01***30 | Bolt - Lower Oil Cooler Outlet Tubemounting | 4 |
| 02***16 | Plug | 1 |
| 04***12 | Ring, Snap | 1 |
Komatsu : Sa6d125-1q(S/N 28389-Up) : Lubricating Oil System : Lubricating Oil Piping
| 01***50 | Bolt,(With Service Valve R.H.) | 4 |
| 01***16 | Washer,Radio Controlled Slag Handling | 7 |
| 04***12 | Ring, Snap | 1 |
Komatsu : Sa6d125-1q(S/N 28389-Up) : Lubricating Oil System : Lubricating Oil Pump And Suction Pipe
| 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 : Sa6d125-1q(S/N 28389-Up) : Lubricating Oil System : Pto Lubricating Oil Piping
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 07***12 | O-Ring, Between Valve And Pump | 1 |
| 07***12 | Gasket,(Without Air Compressor Type) (K2) | 6 |
Komatsu : Sa6d125-1q(S/N 28389-Up) : Lubricating Oil System : Turbocharger Lubricating Oil Piping
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***55 | Bolt, Mount Tube To Switch Pump | 1 |
Tool And Kit
Komatsu : Sa6d125-1q(S/N 28389-Up) : Tool And Kit : Gasket Kit
| 01***23 | Washer,(Not Shown) | 1 |
| 02***43 | O-Ring,Water Manifold | 6 |
| 07***12 | O-Ring, Between Valve And Pump | 1 |
SA6D125-1Q(S/N 28389-UP) serial number reference
The engine serial number plate is located on the left side of the engine block, typically near the injection pump or on a metal plate affixed to the valve cover. Read the prefix to identify the engine model (SA6D125-1Q) and the subsequent digits to confirm the serial number falls within the 28389-UP range for correct parts identification.
| Prefix | Identifies | Notes |
|---|---|---|
| SA6D125-1Q | Engine Model | Identifies the SA6D125-1Q engine family. The serial range 28389-UP applies to this specific engine configuration within the Komatsu equipment lineup. Source: published references catalog listing and DK Engine Parts equipment guide. |
Frequently asked questions
What is the engine model for the Komatsu SA6D125-1Q(S/N 28389-UP)?
The engine model is the Komatsu SA6D125-1Q, a turbocharged, aftercooled diesel engine from the 125 Series.
What is the operating weight of the machine powered by this engine?
Operating weight varies by configuration and series, typically ranging from 34,000 to 52,000 lb (15,422 to 23,587 kg) for equipment like the PC400-6 and WA470-3.
What engine replaced the SA6D125-1Q?
The SA6D125-1Q was replaced by the SAA6D125E-2 series to meet Tier 4 Final emissions standards.
What SA6D125-1Q(S/N 28389-UP) owners discuss
How does the SA6D125-1Q engine compare to the Cummins L10 in terms of torque and durability?
What are the typical powertrain and hydraulic behaviors associated with this engine series?
What undercarriage and wear patterns are typical for machines powered by this engine?
What are the common electrical and sensor issues for this engine series?
What is the most common cause of engine overheating in this configuration?
What should be checked first if the engine loses power under digging load?
What to check when buying a used machine with the SA6D125-1Q engine (S/N 28389-UP)?
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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