Komatsuengine(no series)
Komatsu 6D95L-1AC-E(S/N 96999-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu 6D95L-1AC-E engine (S/N 96999-UP) is a 4.9-liter inline-six turbocharged diesel power unit designed for heavy-duty construction applications. It typically powers mid-size crawler excavators such as the PC200-5 and PC210-5 series, as well as certain wheel loaders and dozers. Operating in the 100-250 HP class, these machines generally fall within the 20,000 to 60,000 lb operating weight range. The 6D95L series succeeded earlier 6D95 models and was later replaced by the 6D95E and 6D105E series to meet evolving emissions standards. Configurations varied by region and machine type, with the 1AC-E variant specifically designated for certain export markets and machine platforms.
Across the 6D95L generation, Komatsu refined fuel injection systems and turbocharging to improve torque output and fuel efficiency while maintaining the robust mechanical reliability the series is known for. The 6D95L-1AC-E remains significant in the used and parts market because it powers a high-volume fleet of PC200 and PC210 excavators still widely active in earthmoving. Its simple mechanical injection design and widespread availability of aftermarket components make it a cost-effective alternative to newer electronic engines. The S/N 96999-UP range represents later production units with specific calibration and component updates that distinguish them from earlier 6D95L-1A and 6D95L-1AA variants.
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 6D95L-1AC-E(S/N 96999-UP) specifications
Engine
| Model | 6D95L-1AC-E |
| Series | 6D95L-1 |
| Displacement | 4.890 L (298.4 cu in) |
| Cylinders | 6, in-line |
| Bore | 95 mm (3.74 in) |
| Stroke | 115 mm (4.53 in) |
| Aspiration | Turbocharged |
| Emissions Tier | Tier 1 / Stage II |
Weights
| Engine Weight | 420–430 kg (926–948 lb) |
Dimensions
| Engine Length | 1056–1075 mm (41.6–42.3 in) |
| Engine Width | 620–625 mm (24.4–24.6 in) |
| Engine Height | 1093–1100 mm (43.0–43.3 in) |
Performance
| Power Range | 52–59 kW (70–80 hp) |
| Power Speed | 2350–2500 rpm |
| Torque Range | 265–270 N·m (195–199 lb·ft) |
| Torque Speed | 1400 rpm |
Service capacities (summary)
| Engine Oil Capacity | Not documented for this exact serial range — verify with your dealer |
| Cooling System Capacity | Not documented for this exact serial range — verify with your dealer |
| Fuel Tank Capacity | Not documented for this exact serial range — verify with your dealer |
| Hydraulic System Capacity | 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 6D95L-1AC-E(S/N 96999-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 6D95L-1AC-E(S/N 96999-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize KOWA fluid analysis at every 500-hour interval to monitor engine wear metals and coolant contamination. Check the air filter restriction indicator daily to prevent turbocharger damage from dust ingestion. Monitor hydraulic oil particle counts to detect pump wear early. Track fuel dilution levels in the engine oil to identify injector or piston ring issues before they cause catastrophic failure. Use KOMTRAX telematics to track load frequency and fuel burn rates for accurate service scheduling.
Corrective & Common Repairs
Address hard starting by inspecting the mechanical fuel injection pump and governor linkage. Replace worn piston rings and cylinder liners if blue smoke or excessive oil consumption occurs. Check the turbocharger shaft play and bearing condition if boost pressure drops. Inspect the fuel water separator daily to prevent corrosion in the injection system. Replace worn bushings in the linkage and control levers to restore precise engine response and hydraulic coordination.
Overhaul & Rebuild Points
Plan a major overhaul when compression drops below specification or oil pressure falls despite new filters. Measure cylinder liner wear and crankshaft journal dimensions to determine if machining is required. Replace all piston rings, connecting rod bearings, and main bearings during an out-of-frame rebuild. Inspect the cylinder head for cracks and warpage, resurfacing or replacing as needed. Verify valve seat integrity and replace guides if clearance exceeds limits to restore proper combustion and cooling.
Seasonal & Environment Servicing
In cold climates, use low-temperature fuel additives and ensure the coolant mixture provides adequate freeze protection. Check the battery charge state frequently as cold temperatures reduce cranking power. In hot or dusty environments, clean the radiator and oil cooler fins daily to prevent overheating. Use high-temperature grease for undercarriage and swing bearing points. Inspect all rubber hoses and belts for UV degradation and replace them proactively to avoid sudden failure during peak season.
6D95L-1AC-E(S/N 96999-UP) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 07281-00197 | Clamp,(With Pre-Fuel Filter) | Fuel system service | Check fitment → |
| 600-311-7440 | Cartridge,Fuel Filter | Fuel system service | Check fitment → |
| 6206-73-6200 | Fuel Filter Ass'Y | Fuel system service | Check fitment → |
| 600-311-1190 | Plate? Caution,Fuel Filter | Fuel system service | Check fitment → |
| 09637-30161 | Plate? Instruction,Air Cleaner (Single Element) | Air intake service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
6D95L-1AC-E(S/N 96999-UP) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| CA115 | Engine speed sensor and backup speed sensor failure | Faulty crankshaft speed sensor, damaged wiring harness, or corroded connector pins at the sensor or ECM. | Inspect the sensor gap and wiring integrity; replace the speed sensor if voltage readings are out of specification. |
| CA441 | Battery voltage is too low | Weak or discharged battery, loose terminal connections, or failing alternator charging system. | Check battery terminal tightness and charge state; test alternator output voltage under load. |
| CA442 | Battery voltage is too high | Faulty voltage regulator, failing alternator, or open ground connection in the charging circuit. | Test alternator regulator function and inspect ground straps for corrosion or breakage. |
| CA122 | Intake air pressure sensor feedback voltage is too high | Short to power in the sensor circuit, failed intake pressure sensor, or ECM reference voltage issue. | Backprobe the sensor connector to verify signal voltage; inspect wiring for chafing or shorting to the 5V supply. |
| CA123 | Intake air pressure sensor feedback voltage is too low | Open circuit in the sensor wiring, disconnected sensor plug, or failed sensor internal element. | Check for continuity in the sensor harness; verify the sensor is securely plugged in and the connector pins are not bent. |
| CA451 | Common rail pressure sensor feedback value is too high | Stuck pressure sensor, actual overpressure condition due to fuel system malfunction, or shorted signal wire. | Monitor live rail pressure data; inspect the sensor wiring for shorts and verify the sensor calibration against factory specs. |
| CA452 | Common rail pressure sensor feedback value is too low | Open circuit in the sensor wiring, disconnected sensor, or actual low fuel pressure due to pump or regulator failure. | Check sensor connector integrity and harness continuity; verify actual fuel rail pressure with a mechanical gauge if possible. |
| CA234 | Engine overspeed | Faulty throttle control mechanism, stuck fuel rack, or malfunctioning electronic governor/solenoid. | Inspect the throttle linkage and electronic control solenoid for binding; verify governor operation during startup. |
| AA10NX | Air filter clogging | Dirty or blocked air cleaner element, restricted intake path, or faulty differential pressure switch. | Inspect the air filter indicator; replace the air filter element if the indicator shows clogging or per maintenance schedule. |
| E10 | Engine controller power failure or engine control drive system circuit malfunction | Blown fuse, broken power wire to the ECM, or internal ECM power supply failure. | Check all ECM power fuses and main power relay; verify voltage at the ECM main power connector pins. |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
6D95L-1AC-E(S/N 96999-UP) attachments & work tools
Excavator Attachments
The 6D95L-1AC-E engine (S/N 96999-UP) powers the Komatsu PC200-6L and PC210LC-6L excavator classes, which utilize standard quick-attach couplers for bucket and tool interchangeability. Typical bucket capacities for this size class range from 0.7 to 1.2 cubic meters (0.9 to 1.6 cubic yards), with hydraulic flow requirements varying by specific pump configuration. Factory guarding options include rock shields and side cutters for heavy-duty excavation applications.
Dozer Attachments
This engine specification is associated with the Komatsu D31P-18 dozer series, which employs a fixed blade mounting system rather than a quick-attach coupler. Blade widths for this class typically range from 3.0 to 3.5 meters (9.8 to 11.5 feet), with standard straight or semi-U configurations. Notable factory options include ripper attachments for breaking hard ground and side-shift mechanisms for precise grading.
Hydraulic & Mounting Systems
Work tool compatibility relies on high-pressure hydraulic lines routed through the boom and stick, with flow rates determined by the machine's main pump assembly. Mounting systems for excavators use pin-on couplers, while dozers utilize bolt-on blade frames with hydraulic cylinders for tilt and angle adjustment. Hydraulic fluid specifications require Komatsu EO or equivalent high-quality diesel engine oil for the power train case and hydraulic system.
All 6D95L-1AC-E(S/N 96999-UP) assemblies by section
Every catalogued assembly group for the Komatsu 6D95L-1AC-E(S/N 96999-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Engine
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Air Cleaner
| 01***30 | Screw | 2 |
| 01***06 | Nut | 6 |
| 04***10 | Ring,See Fig. K4010-65a0 | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Air Cleaner (Air Connector Elbow Type)
| 04***10 | Ring,See Fig. K4010-65a0 | 1 |
| 07***09 | Clamp,(With Cylinder Cover) | 2 |
| 60***11 | Washer,Seal (K26) | 2 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Air Cleaner (High Altitude Spec.)
| 01***20 | Bolt,(For Japan Pc200) | 4 |
| 04***10 | Ring,See Fig. K4010-65a0 | 1 |
| 07***09 | Clamp, Hose - At Water Pump | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Air Cleaner (With Extension)
| 04***10 | Ring,See Fig. K4010-65a0 | 1 |
| 07***09 | Clamp,(With Cylinder Cover) | 2 |
| 60***11 | Washer,Seal (K26) | 2 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Air Intake (For 13a? 25a Alternator)
| 01***30 | Screw | 10 |
| 01***70 | Bolt | 4 |
| 01***85 | Bolt | 2 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Air Intake (For 15a Alternator With Water Separator) (Noise Suppression Spec.)
| 01***30 | Screw | 10 |
| 01***70 | Bolt | 4 |
| 01***85 | Bolt | 2 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Air Intake (For 15a Alternator)
| 01***30 | Screw | 10 |
| 01***70 | Bolt | 6 |
| 01***85 | Bolt | 2 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Air Intake (For 15a Alternator) (Air Connector Elbow Type)
| 01***10 | Bolt (M10x1.50x10) | 4 |
| 01***30 | Screw | 10 |
| 01***85 | Bolt | 2 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Air Intake (High Altitude Spec.)
| 01***30 | Screw | 11 |
| 01***70 | Bolt | 2 |
| 01***85 | Bolt | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Air Intake (With Water Separator)
| 01***10 | Bolt (M10x1.50x10) | 2 |
| 01***30 | Screw | 10 |
| 01***85 | Bolt | 2 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Alternator (13a) (With Hardening Pulley) (Inner Parts)
| 60***71 | Alternator A. (13a),(With Hardening Pulley) | 1 |
| KD***31 | Bushing,Insulator | 2 |
| KD***80 | Packing | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Alternator (15a) (With Non Hardening Pulley) (Inner Parts)
| 60***50 | Alternator A. (15a) | 1 |
| KD***70 | Cover | 1 |
| KD***30 | Retainer | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Alternator (25a) (With Non Hardening Pulley) (Inner Parts)
| 60***40 | Alternator A. (25a) | 1 |
| KD***57 | Bearing,Ball? Front | 1 |
| KD***11 | Rear Bracket Ass'Y | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Alternator Mounting (13a) (With Hardening Pulley)
| 01***50 | Bolt | 1 |
| 01***40 | Bolt,(Shim 3-Piece) | 1 |
| 01***20 | Bolt,(For Japan Pc200) | 2 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Alternator Mounting (15a) (With Non Hardening Pulley)
| 01***35 | Screw | 1 |
| 01***55 | Bolt | 1 |
| 01***06 | Nut | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Alternator Mounting (25a) (With Non Hardening Pulley)
| 01***50 | Bolt | 1 |
| 01***40 | Bolt,(Shim 3-Piece) | 1 |
| 01***20 | Bolt,(For Japan Pc200) | 2 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Camshaft And Tappet
| 01***20 | Screw | 2 |
| 04***16 | Fitting Wedge | 1 |
| 06***06 | Bearing | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Cooling Fan
| 01***45 | Bolt | 6 |
| 01***30 | Screw | 6 |
| 60***20 | Fan,Cooling | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Cooling Fan (Reversible Fan Type)
| 01***45 | Bolt | 6 |
| 01***30 | Screw | 6 |
| 60***10 | Fan,(Reversible Type) | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Crank Pulley (Hardening Pulley) (For 13a Alternator)
| 01***45 | Bolt,Nylock | 1 |
| 61***20 | Collar,Taper | 1 |
| 61***31 | Plate | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Crank Pulley (Non Hardening Pulley) (For 15a? 25a Alternator)
| 01***45 | Bolt,Nylock | 1 |
| 61***20 | Collar,Taper | 1 |
| 61***31 | Plate | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Crank Pulley (Non Hardening Pulley) (High Altitude Spec.)
| 01***45 | Bolt,Nylock | 1 |
| 61***20 | Collar,Taper | 1 |
| 61***31 | Plate | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Crankshaft
| 62***00 | Main Metal Ass'Y | 7 |
| 62***00 | Thrust Metal Ass'Y | 1 |
| 62***00 | Main Metal Ass'Y | 7 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Cylinder Block
| 01***16 | Screw | 4 |
| 04***20 | Pin,Dowel (Welded) | 2 |
| 04***28 | Pin, Dowel - Transmission Case, Pin-Dowel | 2 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Cylinder Block (High Altitude Spec.)
| 04***20 | Pin,Dowel (Welded) | 2 |
| 04***28 | Pin, Dowel - Transmission Case, Pin-Dowel | 2 |
| 04***08 | Adapter Sleeves | 6 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Cylinder Block Gasket Kit
| 07***05 | O-Ring,(Not Used With Emergency Str.) (K2) | 2 |
| 07***35 | O-Ring,Hydraulic Oil Filter | 1 |
| 07***50 | O-Ring,Front Cover Plate | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Cylinder Block Gasket Kit (High Altitude Spec.)
| 01***12 | Washer,Lock? Injection Gear | 1 |
| 01***16 | Washer,Lock? Injection Gear | 1 |
| 07***80 | O-Ring,Hydraulic Oil Filter | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Cylinder Head
| 01***32 | Washer, (Without Emergency Steering) | 25 |
| 02***04 | Plug, Pipe | 1 |
| 07***08 | Plug, Expansion | 6 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Cylinder Head (High Altitude Spec.)
| 01***32 | Washer, (Without Emergency Steering) | 25 |
| 02***04 | Plug, Pipe | 1 |
| 07***08 | Plug, Expansion | 6 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Cylinder Head Gasket Kit
| 08***14 | Band,(For Additional Fuel Strainer) | 2 |
| 08***19 | Band,(Without Air Conditioner) | 2 |
| 61***30 | Gasket,Air Cleaner | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Cylinder Head Gasket Kit (High Altitude Spec.)
| 07***18 | O-Ring,Turbocharger Lubricating Pipe | 1 |
| 08***14 | Band,(For Additional Fuel Strainer) | 2 |
| 08***19 | Band,(Without Air Conditioner) | 2 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Damper
| 01***16 | Bolt,(With Alternator Cover Type) | 6 |
| 62***00 | Damper,(Except Japan Pc200) | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Engine Mounting
| 01***45 | Bolt,(For Power Tilt Mech Angle) | 6 |
| 01***55 | Bolt, Mount Tube To Switch Pump | 5 |
| 01***35 | Bolt, Bolt, Mount Tubes To Switch And Work Pumps | 2 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Exhaust Manifold
| 01***25 | Grub Screw | 4 |
| 01***45 | Bolt, Bracket Mounting | 12 |
| 61***50 | Nut | 4 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Exhaust Manifold (High Altitude Spec.)
| 01***25 | Grub Screw | 4 |
| 01***90 | Bolt,(For Large Fan) | 12 |
| 07***08 | Plug,(For W/O. Corrosion Resistor) | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Flywheel
| 01***30 | Bolt | 6 |
| 06***04 | Bearing,Ball | 1 |
| 62***10 | Washer | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Flywheel Housing
| 01***30 | Bolt - Lower Oil Cooler Outlet Tubemounting | 11 |
| 07***15 | Plug | 1 |
| 61***32 | Seal? Rear (K2) | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Front Cover
| 01***16 | Bolt | 2 |
| 01***16 | Screw | 3 |
| 01***65 | Bolt,(For 35a? 25a Alternator) | 15 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Front Cover (With Cover)
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Front Hanger (For 13a? 25a Alternator)
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 2 |
| 62***50 | Hanger,Front (With Tension Pulley) | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Front Hanger (For 15a Alternator)
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 2 |
| 62***30 | Hanger,Front (W/O Corrosion Resistor) | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Front Power Take Off
| 06***07 | Bearing | 1 |
| 06***08 | Bearing,Ball | 1 |
| 07***12 | Gasket,(Without Air Compressor Type) (K2) | 2 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Fuel Filter (For 13a? 25a Alternator)
| 01***85 | Bolt | 2 |
| 01***15 | Bolt,(With Water Separator) | 2 |
| 01***16 | Washer,(With Water Separator) | 2 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Fuel Filter (For 15a Alternator)
| 01***20 | Bolt | 2 |
| 07***12 | Gasket,(Without Air Compressor Type) (K1) | 6 |
| 07***14 | Bolt,Joint | 2 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Fuel Filter (High Altitude Spec.)
| 01***75 | Bolt,(For Shipping) | 2 |
| 01***00 | Bolt | 2 |
| 01***16 | Washer,(With Water Separator) | 2 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Fuel Injection Pump (Feed Pump) (High Altitude Spec.) (Inner Parts)
| DK***20 | Bolt, Joint | 1 |
| DK***00 | Valve,Check | 2 |
| DK***10 | Feed Pump Ass'Y,(Not Shown) | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Fuel Injection Pump (Feed Pump) (Inner Parts)(#100413-)
| DK***20 | Bolt, Joint | 1 |
| DK***00 | Valve,Check | 2 |
| DK***10 | Feed Pump Ass'Y,(Not Shown) | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Fuel Injection Pump (Feed Pump) (Without Stop Motor) (Inner Parts)(#100413-)
| DK***20 | Bolt, Joint | 1 |
| DK***00 | Valve,Check | 2 |
| DK***10 | Feed Pump Ass'Y,(Not Shown) | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Fuel Injection Pump (Governor) (1/2) (High Altitude Spec.) (Inner Parts)
| DK***00 | Shim? 2.00mm,(High Altitude Spec.) | 0 |
| DK***00 | Adapter | 1 |
| DK***80 | Nut | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Fuel Injection Pump (Governor) (1/2) (Inner Parts)(#100413-)
| DK***00 | Shim? 2.00mm,(High Altitude Spec.) | 0 |
| DK***00 | Adapter | 1 |
| DK***30 | Governor Ass'Y | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Fuel Injection Pump (Governor) (1/2) (Without Stop Motor) (Inner Parts)(#100413-)
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Fuel Injection Pump (Governor) (2/2) (High Altitude Spec.) (Inner Parts)
| DK***40 | Gasket,Air Compressor | 2 |
| DK***00 | Nut,Cap | 1 |
| DK***20 | Cover | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Fuel Injection Pump (Governor) (2/2) (Inner Parts)(#100413-)
| DK***40 | Gasket,Air Compressor | 2 |
| DK***00 | Nut,Cap | 1 |
| DK***00 | Bushing | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Fuel Injection Pump (Governor) (2/2) (Without Stop Motor) (Inner Parts)(#100413-)
| DK***40 | Gasket,Air Compressor | 2 |
| DK***00 | Nut,Cap | 1 |
| DK***20 | Cover | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Fuel Injection Pump (Pump) (1/2) (High Altitude Spec.) (Inner Parts)
| 62***52 | Injection Pump Ass'Y | 1 |
| DK***30 | Key,Woodruff | 1 |
| DK***30 | Bearing | 0 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Fuel Injection Pump (Pump) (1/2) (Inner Parts)(#100413-)
| 62***30 | Injection Pump Ass'Y | 1 |
| DK***30 | Key,Woodruff | 1 |
| DK***30 | Bearing | 0 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Fuel Injection Pump (Pump) (1/2) (Without Stop Motor) (Inner Parts)(#100413-)
| 62***52 | Injection Pump Ass'Y | 1 |
| DK***30 | Key,Woodruff | 1 |
| DK***30 | Bearing | 0 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Fuel Injection Pump (Pump) (2/2) (High Altitude Spec.) (Inner Parts)
| DK***40 | Shim? 0.50mm, Shim, 0.50mm; Was Dk029311-0040 | 0 |
| DK***90 | Shim? 0.25mm, Shim, 0.25mm; Was Dk029311-0590 | 0 |
| DK***00 | Sleeve,Control | 6 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Fuel Injection Pump (Pump) (2/2) (Inner Parts)(#100413-)
| DK***40 | Shim? 0.50mm, Shim, 0.50mm; Was Dk029311-0040 | 0 |
| DK***90 | Shim? 0.25mm, Shim, 0.25mm; Was Dk029311-0590 | 0 |
| DK***00 | Sleeve,Control | 6 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Fuel Injection Pump (Pump) (2/2) (Without Stop Motor) (Inner Parts)(#100413-)
| DK***40 | Shim? 0.50mm, Shim, 0.50mm; Was Dk029311-0040 | 0 |
| DK***90 | Shim? 0.25mm, Shim, 0.25mm; Was Dk029311-0590 | 0 |
| DK***00 | Sleeve,Control | 6 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Fuel Injection Pump Lubricator
| 07***12 | Gasket,(Without Air Compressor Type) (K2) | 2 |
| 07***10 | Screw, Banjo Connector (M10-1.25x20) | 1 |
| 62***30 | Pipe,Oil | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Fuel Injection Pump Mounting (High Altitude Spec.)
| 01***35 | Grub Screw | 4 |
| 01***12 | Bolt,(See Fig.0501) | 1 |
| 01***16 | Bolt,(With Alternator Cover Type) | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Fuel Injection Pump Mounting (Without Stop Motor)(#100413-)
| 01***35 | Grub Screw | 4 |
| 01***12 | Bolt,(See Fig.0501) | 1 |
| 01***16 | Bolt,(With Alternator Cover Type) | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Fuel Injection Pump Mounting(#100413-)
| 01***35 | Grub Screw | 4 |
| 01***12 | Bolt,(See Fig.0501) | 1 |
| 01***20 | Bolt,(For Japan Pc200) | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Fuel Return (For 13a? 25a Alternator) (For 15a Alternator With Water Separator)
| 01***16 | Bolt,(With Alternator Cover Type) | 1 |
| 01***50 | Bolt,(For Shipping) | 1 |
| 04***10 | Clip,(With Accumulator) | 2 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Fuel Return (For 13a? 25a Alternator) (Noise Suppression Spec.)
| 01***16 | Bolt,(With Alternator Cover Type) | 1 |
| 04***10 | Clip,(With Accumulator) | 2 |
| 07***05 | Tube | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Fuel Return (For 15a Alternator)
| 07***00 | Clip | 3 |
| 62***00 | Tube,Spill | 1 |
| 62***90 | Tube,Spill | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Fuel Return (High Altitude Spec.)
| 01***16 | Bolt,(With Alternator Cover Type) | 1 |
| 01***50 | Bolt,(For Shipping) | 1 |
| 01***85 | Bolt | 2 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Head Cover
| 01***20 | Bolt,(For Japan Pc200) | 1 |
| 04***50 | Screw | 4 |
| 07***09 | Clamp,(See Fig. K0210-16a0) | 2 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Head Cover (High Altitude Spec.)
| 01***20 | Bolt,(For Japan Pc200) | 1 |
| 04***50 | Screw | 4 |
| 07***09 | Clamp,(See Fig. K0210-16a0) | 2 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Heater Switch
| 01***12 | Bolt | 2 |
| 01***20 | Bolt,(For Japan Pc200) | 2 |
| 01***25 | Bolt,(With Corrosion Resistor) | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Holder (Inner Parts)
| 62***10 | Holder Ass'Y | 6 |
| DK***00 | Shim? 0.75mm | 0 |
| DK***00 | Shim? 1.200mm | 0 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Idler Gear
| 01***75 | Bolt - Cab To Rops | 1 |
| 04***20 | Ring, Snap | 1 |
| 06***06 | Bearing | 2 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Injection Nozzle
| 01***35 | Bolt, Mount Bracket To Floor | 6 |
| 07***00 | Clip | 11 |
| 62***10 | Carrier | 6 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Injection Piping
| 01***25 | Screw | 4 |
| 61***30 | Clip | 1 |
| 62***00 | Clip Ass'Y | 4 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Muffler
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 2 |
| 01***16 | Screw | 1 |
| 01***16 | Bolt,(With Alternator Cover Type) | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Muffler (Catalyzer Type)(#100413-)
| 01***15 | Bolt | 1 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 2 |
| 01***16 | Screw | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Muffler (High Altitude Spec.)
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 3 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 3 |
| 01***45 | Bolt, Bracket Mounting | 3 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Muffler (Noise Suppression Spec.)
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 2 |
| 01***16 | Screw | 1 |
| 01***16 | Bolt,(With Alternator Cover Type) | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Muffler (With Spark Arrester Catalyzer Type)(#100413-)
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 2 |
| 01***16 | Screw | 1 |
| 01***16 | Bolt,(With Alternator Cover Type) | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Muffler (With Spark Arrester)(#100413-)
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 2 |
| 01***16 | Screw | 1 |
| 01***16 | Bolt,(With Alternator Cover Type) | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Muffler Piping (High Altitude Spec.)
| 01***80 | Bolt, Mount Strainer Flange | 1 |
| 01***20 | Bolt,(For Japan Pc200) | 2 |
| 01***25 | Bolt,(With Corrosion Resistor) | 2 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Name Plate And Caution (Chinese)(#100413-)
| 09***61 | Plate? Instruction,(Chinese) (Not Shown) | 1 |
| 60***20 | Plate? Caution,Oil Filter | 1 |
| 60***90 | Plate? Caution,Fuel Filter | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Name Plate And Caution (English)
| 09***61 | Plate? Instruction,Air Cleaner (Single Element) | 1 |
| 60***30 | Plate? Caution,Oil Filter And Bypass Filter | 1 |
| 60***20 | Plate? Caution,(English)(Not Shown) | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Name Plate And Caution (French-English)
| 09***62 | Plate? Instruction,Air Cleaner (Double Element) | 1 |
| 60***90 | Plate? Caution,(French-English) | 1 |
| 60***50 | Plate? Caution,(French-English) | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Name Plate And Caution (German-English)
| 09***61 | Plate? Instruction,(German-English) (Not Shown) | 1 |
| 60***80 | Plate? Caution,(German-English) | 1 |
| 60***40 | Plate? Caution,(German-English) | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Name Plate And Caution (Indonesian-English)
| 09***61 | Plate? Instruction,(Indonesian-English)(Not Shown | 1 |
| 60***50 | Plate? Caution,(Indonesian-English) | 1 |
| 60***20 | Plate? Caution,(English-Indonesian) | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Name Plate And Caution (Italian-English)(#100413-)
| 09***61 | Plate? Instruction,(Italian-English) (Not Shown) | 1 |
| 60***20 | Plate? Caution,(Italian-English) | 1 |
| 60***50 | Plate? Caution,(Italian-English) | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Name Plate And Caution (Spanish-English)
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Oil Filter
| 60***41 | Cartridge,Engine Oil Filter (D31s) | 1 |
| 60***42 | Cartridge,Engine Oil Filter | 1 |
| 62***10 | Nipple | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Oil Level Gauge
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 1 |
| 01***20 | Screw | 1 |
| 01***06 | Nut | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Oil Level Gauge (High Altitude Spec.)
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 1 |
| 01***25 | Bolt,(With Corrosion Resistor) | 1 |
| 01***06 | Nut | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Oil Pan And Suction Tube
| 01***16 | Bolt, Mount Solenoid Valve | 30 |
| 01***12 | Bolt,(See Fig.0501) | 1 |
| 01***16 | Screw | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Oil Pan And Suction Tube (High Altitude Spec.)
| 01***16 | Bolt, Mount Solenoid Valve | 30 |
| 01***12 | Bolt,(See Fig.0501) | 1 |
| 01***16 | Screw | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Oil Pump
| 01***16 | Screw | 4 |
| 01***25 | Bolt,(With Corrosion Resistor) | 1 |
| 62***10 | Valve | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Oil Pump (High Altitude Spec.)
| 01***16 | Screw | 3 |
| 01***30 | Bolt,(Water Separator Spec.) | 2 |
| 62***10 | Valve | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Piston
| 04***12 | Ring, Snap | 12 |
| 62***02 | Piston Ring Ass'Y,Per Cylinder | 6 |
| 62***10 | Pin,Piston | 6 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Rear Hanger
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 2 |
| 62***60 | Hanger,Rear | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Rocker Arm
| 01***65 | Bolt,(For Alternator Bracket Mount) | 8 |
| 61***30 | Circlip | 2 |
| 62***20 | Spring | 5 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Safety Guard (For 25a Alternator)
| 01***16 | Bolt, Mount Solenoid Valve | 1 |
| 01***32 | Washer,(With Auto Emergency Steering) | 1 |
| 61***50 | Spacer | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Spare Parts (For 15a Alternator)
| 07***16 | Gasket,(For Pc750-6) (See Fig.A2110) | 1 |
| 60***41 | Cartridge,Engine Oil Filter (D31s) | 1 |
| 60***40 | Cartridge,Fuel Filter | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Spare Parts (For 25a Alternaotr Reversible Fan Type) (For 13a Alternator)(#100413-)
| 04***32 | V-Belt,(For Trimming Dozer) | 1 |
| 04***53 | V-Belt,(For Add. Air Compressor) | 1 |
| 07***16 | Gasket,(For Pc750-6) (See Fig.A2110) | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Spare Parts (For 25a Alternator)(#100413-)
| 04***34 | V-Belt,(Tropical Sandy? Dusty Spec.) | 1 |
| 07***16 | Gasket,(For Pc750-6) (See Fig.A2110) | 1 |
| 60***41 | Cartridge,Engine Oil Filter (D31s) | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Starting Motor (5.5kw) (Inner Parts)
| 60***50 | Starting Motor Ass'Y,(5.5kw) | 1 |
| KD***30 | Bracket,Center | 1 |
| KD***20 | Cneter Bracket A | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Starting Motor Mounting (5.5kw)
| 01***30 | Bolt | 2 |
| 07***05 | O-Ring,(Not Used With Emergency Str.) (K2) | 1 |
| (6***0) | Starting Motor Ass'Y,(5.5kw) (See Fig.A6210-B0a2) | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Stop Motor
| 01***16 | Bolt | 3 |
| 01***20 | Bolt,(With Tachometer Outlet) | 1 |
| 01***20 | Screw | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Tension Pulley (For 13a Alternator)
| 01***12 | Bolt | 4 |
| 01***25 | Bolt,(With Corrosion Resistor) | 1 |
| 01***65 | Bolt,(With Water Separator) | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Tension Pulley (For 25a Alternator)
| 01***65 | Bolt, Mount Tube To Divider Valve | 1 |
| 01***20 | Bolt,(For Japan Pc200) | 1 |
| 01***06 | Nut | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Turbocharger (High Altitude Spec.) (Inner Parts)
| 62***20 | Turbocharger Ass'Y | 1 |
| GA***16 | Bolt | 6 |
| GA***64 | Housing,Turbine | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Turbocharger Oil Piping (High Altitude Spec.)
| 01***16 | Screw | 5 |
| 01***20 | Screw | 4 |
| 01***06 | Nut | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Water Pump
| 01***16 | Screw | 5 |
| 01***20 | Screw | 2 |
| 01***75 | Bolt,(For Shipping) | 4 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Water Pump (For Reversible Fan)
| 01***16 | Screw | 5 |
| 01***20 | Screw | 2 |
| 01***75 | Bolt,(For Shipping) | 4 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Water Pump Pulley (Hardening Pulley) (For Trimming Dozer) (High Altitude Spec.)(#100413-)
| 04***32 | V-Belt,(For Trimming Dozer) | 1 |
| 04***53 | V-Belt,(For Add. Air Compressor) | 1 |
| 62***60 | Pulley? Hardening | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Water Pump Pulley (Non Hardening Pulley) (For 13a?25a Alternator)(Noise Suppression Spec.)
| 04***34 | V-Belt,(Tropical Sandy? Dusty Spec.) | 1 |
| 62***10 | V-Belt,Fan Drive | 1 |
| 62***80 | Pulley?Non Hardening,(Tropical Sandy? Dusty Spec.) | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Water Pump Pulley (Non Hardening Pulley) (For 25a Alternator)
| 04***32 | V-Belt,(For Trimming Dozer) | 1 |
| 04***53 | V-Belt,(For Add. Air Compressor) | 1 |
| 62***61 | Pulley?Non Hardening,(For Japan Pc200) | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Water Pump Pulley (Non Hardening Pulley) (One-Groove Pulley) (For 15a Alternator)
| 62***80 | Pulley?Non Hardening | 1 |
| 62***10 | V-Belt,Fan Drive | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Water Pump Pulley (Non Hardening Pulley) (Two-Groove Pulley) (For 15a Alternator)(#100413-)
| 04***54 | V-Belt,(For 75a Alternator) | 1 |
| 62***90 | Pulley?Non Hardening | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Water Separator (For 13a? 25a Alternator)
| 01***25 | Bolt,(With Corrosion Resistor) | 2 |
| 01***10 | Bolt | 2 |
| 07***60 | O-Ring,(For Pc750?800?1800) (A2610) | 1 |
Komatsu : 6d95l-1ac-E(S/N 96999-Up) : Engine : Water Separator (For 15a Alternator)
| 01***25 | Bolt,(With Corrosion Resistor) | 2 |
| 01***10 | Bolt | 2 |
| 01***15 | Bolt,(With Water Separator) | 2 |
Frequently asked questions
What is the engine model?
The engine is a Komatsu 6D95L-1AC-E, a 4.9-liter inline-six turbocharged diesel.
What is the operating weight of the machine?
Operating weight varies by configuration and attachment, typically ranging from 20,000 to 60,000 lb (9,182 to 27,215 kg) for machines powered by this engine series.
What replaced the 6D95L series?
The 6D95L series was succeeded by the 6D95E and 6D105E series engines to meet stricter emissions regulations.
What 6D95L-1AC-E(S/N 96999-UP) owners discuss
What are the typical powertrain and hydraulic behaviors associated with the Komatsu 6D95L-1AC-E engine series?
The engine is a robust inline-six turbocharged unit designed for heavy-duty construction and earthmoving. It delivers high torque output and reliable power for bulldozers and excavators. Hydraulic performance is closely tied to engine RPM; if engine speed drops heavily when hydraulics are used, the hydraulic system may be placing excessive load on the engine or the engine may be unable to produce its expected power. Conversely, if engine speed remains normal but hydraulic movements become weak, the hydraulic system is the primary suspect. All hydraulic functions becoming slow simultaneously points to shared causes such as hydraulic oil level, correct oil specification, hydraulic filters, or engine RPM under load rather than individual cylinder failure. Hydraulics working cold but becoming weak when hot indicates excessive internal leakage that becomes noticeable as oil viscosity decreases at operating temperature, pointing to pump wear, main control valve leakage, or cylinder leakage. Variations in hydraulic pressure and flow exist depending on the specific machine configuration and serial range. Have your dealer verify system pressures for your specific machine model.
What undercarriage or wear patterns are typical for machines powered by this engine series?
Machines equipped with this engine series, such as bulldozers and excavators, are subject to significant undercarriage wear due to heavy earthmoving applications. Track tension must be monitored regularly, as tracks that repeatedly loosen indicate issues with the tensioner or undercarriage component wear. Machines that travel faster on one side or pull sideways should have mechanical conditions checked first, including track tension on both sides, mud or debris packed into one undercarriage, roller condition, and track-chain condition. If mechanical resistance is similar but one track consistently runs slower, hydraulic or final-drive diagnosis becomes more relevant. Final drives may make noise if oil level is low or contaminated. The operating environment, full of dust, dirt, and fine debris, accelerates wear on all components. Variations in undercarriage wear rates depend on the specific machine type (dozer vs. excavator) and attachment package. Have your dealer verify undercarriage component wear limits for your specific machine model.
What are the known engine quirks and maintenance requirements for the 6D95L-1AC-E series?
The 6D95L-1AC-E is an evolution of the 6D95 series, known for reliability and durability. It is a 5.0L inline-six turbocharged diesel engine. Max power is approximately 81 kW at 2,000 RPM, with estimated torque of 400-450 N·m. The bore and stroke are approximately 102 mm x 110 mm. The engine uses mechanical injection. Consistent, proactive maintenance is key to long-term reliability. Follow Komatsu’s service schedule for oil, filters, coolant, and fuel system maintenance. The engine is sealed with silicone at the oil pan and front cover rather than using gaskets. Over- or under-torquing during reassembly is a common cause of failure; exact torque specs for cylinder head bolts, crankshaft mains, connecting rods, rocker arms, and flywheel must be used. Engine life can be extended by 25–40% through strict adherence to the maintenance schedule. Variations in emission standards (Tier 1/Stage II) and configuration exist across the serial range. Have your dealer verify torque specs and emission configuration for your specific engine serial number.
What are common electrical or sensor issues reported for this engine series?
Electrical issues often manifest as multiple fault codes, which should be addressed by checking the battery, grounds, and connectors. Engine no-start conditions require checking the battery state of charge, battery terminals, engine and chassis grounds, main starter cable, starter relay, and control circuit. A battery can show acceptable voltage until the starter is loaded; if the display dims heavily or voltage collapses during starting, perform a proper load and voltage-drop test before ordering a starter. Engine fault codes should be read to diagnose hard starting, overheating, or power loss. Komatsu’s monitoring systems (e.g., KOMTRAX) can be used to track engine parameters and detect issues early. The engine control strategy is model-specific, so exact machine identification is required for accurate diagnostics. Variations in electrical systems exist depending on the machine generation and regional emissions package. Have your dealer verify the specific electrical diagnostic procedures for your machine model.
What should be checked when buying a used machine with the 6D95L-1AC-E engine?
When buying a used machine, verify the exact serial-prefix specification sheet and installed attachment package, as these change weight, reach, fuel use, and transport planning. Check the engine for signs of low oil operation, which can cause spun rod bearings (specifically noted on cylinders #3 and #4 in some cases). Inspect the cooling package for packed material between heat exchangers (radiator, hydraulic oil cooler, charge-air cooler, air-conditioning condenser). Check hydraulic oil condition and temperature behavior; weak performance when hot indicates internal leakage. Verify track tension and undercarriage wear. Check for multiple fault codes indicating electrical issues. Ensure the engine has been maintained according to Komatsu’s schedule, including oil, filter, coolant, and fuel system service. Confirm the emission tier and regional configuration match your operational needs. Variations in specifications exist across the serial range and machine type. Have your dealer verify the machine's history and exact configuration before purchase.
What are the recommended fluids and capacities for the Komatsu 6D95L-1AC-E engine?
Komatsu specifies genuine lubricants and coolants that meet strict Komatsu Engineering Standards. Recommended fluids include Komatsu EO diesel engine oil, Komatsu TO hydraulic oil, Komatsu AXO powertrain oil, and Komatsu HO axle oil. Super-coolant AF-NAC is recommended for the cooling system. Komatsu Oil/Fuel & Wear Analysis (KOWA) is available for monitoring fluid condition. Specific capacities for engine oil, hydraulic oil, and coolant vary by machine model and configuration. Always consult the operation and maintenance manual for the specific machine to determine exact capacities. Have your dealer verify fluid specifications and capacities for your specific machine model.
How does the 6D95L-1AC-E engine handle heavy excavation loads and cooling?
The engine may lose power under heavy digging load if air and fuel restrictions exist, such as clogged air filters, fuel filters, or restricted fuel tank venting. Intake hoses and charge-air hoses on turbocharged engines must be checked for loose clamps or damage. Engine overheating during heavy excavation is often caused by packed material between heat exchangers. If temperature rises during heavy work but falls when the excavator is allowed to idle, cooling capacity may be marginal. If coolant is repeatedly expelled or the system becomes highly pressurized shortly after a cold start, deeper engine diagnosis may be required. The engine is designed for heavy-duty applications, but proper cooling system maintenance is critical. Variations in cooling system capacity and design exist across different machine models. Have your dealer verify cooling system performance and capacity for your specific machine model.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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