Komatsu 4D95L-W-1E(S/N 11437-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu 4D95L-W-1E engine (S/N 11437-UP) is a compact diesel power unit manufactured since 2017 with a 3.3-liter displacement and four cylinders. It delivers 45 to 60 kW (60 to 80 hp) at approximately 2,200 rpm. This engine powers the Komatsu WA70-1 wheel loader series and the PC120 excavator series. Operating weights for these machines range from 6,180 kg (13,624 lb) for the PC60 class to 34,500 kg (76,058 lb) for larger wheel loaders. The 4D95L-W-1E succeeded earlier 4D95L variants and is part of the 95 Series engine family. Configurations include mechanical and common-rail fuel injection options.
Across generations, the 4D95L-W-1E transitioned from mechanical fuel systems to electronic control for improved efficiency and emissions compliance. The S/N 11437-UP break distinguishes it from earlier 4D95L-W-1A and 4D95L-W-1B variants. In the used and parts market, this engine remains critical because it shares components with the Cummins 3.3L platform, allowing for cost-effective aftermarket rebuild kits. Its compact size and reliability in compact excavators and wheel loaders ensure high demand for service manuals, gasket kits, and overhaul parts.
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 4D95L-W-1E(S/N 11437-UP) specifications
Engine
| Model | 4D95L-W-1E |
| Serial Range | 11437-UP |
| Cylinders | 4 |
| Displacement | 3.3 L (201 cu in) |
| Emissions Tier | Not documented for this exact serial range — verify with your dealer |
| Gross/Net Power | 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 |
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 4D95L-W-1E(S/N 11437-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 4D95L-W-1E(S/N 11437-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize KOWA fluid analysis at every 500-hour interval to monitor wear metals and contaminants in the 4D95L-W-1E engine. Check coolant SCA concentration at 500 hours to prevent scaling in the 3.3-liter block. Monitor hydraulic oil particle count and viscosity to protect the high-pressure injection system. Track engine oil viscosity and fuel dilution to detect piston ring wear early. Use KOMTRAX telematics to log load frequency and fault codes for proactive scheduling. Inspect air filter restriction indicators daily to maintain airflow for the turbocharger.
Corrective & Common Repairs
Address intermittent starting and dashboard failures by checking the engine controller power supply and sensor wiring on the 4D95L-W-1E. Replace worn fuel injectors if power loss or increased fuel consumption occurs. Fix exhaust leaks in the cooling system by inspecting head gaskets and cylinder sleeves. Replace the water pump if overheating persists. Check the alternator and starter connections for corrosion. Replace the fuel filter and drain the water separator to prevent injector clogging. Inspect the turbocharger for shaft play and oil leaks.
Overhaul & Rebuild Points
Perform an inframe overhaul on the 4D95L-W-1E engine when wear measurements exceed factory limits. Replace pistons, rings, and rod bushings using the specific 4D95L-W-1 series kit. Inspect the crankshaft for scoring and replace main bearings if clearance is excessive. Check the cylinder block for cracks or sleeve leakage. Replace the camshaft and cam bearings if valve timing is off. Rebuild the fuel injection pump and replace nozzle tips. Ensure all gaskets and seals are OEM-spec for the 95 Series engine family.
Seasonal & Environment Servicing
In cold weather, check the coolant glycol content and use Komatsu Super-coolant AF-NAC to prevent freezing in the 4D95L-W-1E block. Inspect the battery for charge retention in low temperatures. In dusty environments, clean the radiator and oil cooler fins daily to prevent overheating. Check the air filter more frequently and replace the outer element as needed. Inspect hydraulic hoses for cracking due to UV exposure. Grease all pivot points on the undercarriage and attachment linkage to remove abrasive dust. Drain water from the fuel separator daily to prevent microbial growth.
4D95L-W-1E(S/N 11437-UP) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 07281-00197 | Clamp,(With Pre-Fuel Filter) | Fuel system service | Check fitment → |
| 600-311-6220 | Cartridge,Fuel Filter | Fuel system service | Check fitment → |
| 600-311-9600 | Fuel Filter Ass'Y | Fuel system service | Check fitment → |
| 09637-02161 | Plate? Instruction,Air Cleaner (Double Element) | Air intake service | Check fitment → |
| 09637-01661 | 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.
4D95L-W-1E(S/N 11437-UP) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| CA115 | Engine crankshaft 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 |
| 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 | Sensor malfunction or low pressure condition | Diagnose the fuel rail pressure sensor or pump lines |
| 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 |
| CA153 | Intake air temperature sensor feedback voltage too high | Sensor malfunction | Replace or test the IAT sensor |
| CA154 | Intake air temperature sensor feedback voltage too low | Sensor malfunction | Replace or test the IAT sensor |
| 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 | Alternator failure, battery failure, or voltage regulator issue | Replace the alternator or battery; check the voltage regulator |
| CA442 | Battery voltage too high | Alternator failure or voltage regulator issue | Replace the alternator or battery; check the voltage regulator |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
4D95L-W-1E(S/N 11437-UP) attachments & work tools
Excavator Attachments
The Komatsu 4D95L-W-1E engine powers the PC60-7 series excavators (serial 45001-Up) and PC75UU-3 (serial 15001-Up). Standard work tools include digging buckets ranging from 0.25 to 0.45 cubic meters and grading or cleaning buckets of similar volume. Hydraulic breaker kits are available for these models, requiring specific high-flow hydraulic lines and mounting brackets compatible with the PC60/PC75 boom geometry.
Wheel Loader Attachments
The WA70-1 wheel loader (serial 10001-Up) utilizes the 4D95L-W-1E engine. Primary work tools are general-purpose buckets with capacities between 1.5 and 2.0 cubic meters, alongside rock buckets and wood handling forks. The machine uses a standard pin-on coupler system for quick tool changes, with hydraulic lines routed through the boom for auxiliary functions.
Engine Configuration & Guarding
The 4D95L-W-1E is a turbocharged, water-aftercooled diesel engine. Factory configurations include heavy-duty air pre-cleaners for dusty environments and specific exhaust silencer options for noise reduction. Guarding options include engine compartment screens and heat shields to protect hydraulic lines and electrical harnesses from debris and high temperatures.
All 4D95L-W-1E(S/N 11437-UP) assemblies by section
Every catalogued assembly group for the Komatsu 4D95L-W-1E(S/N 11437-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Cooling System
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Cooling System : Corrosion Resistor And Piping
| 01***40 | Bolt,(Shim 3-Piece) | 2 |
| 01***45 | Bolt, Bracket Mounting | 2 |
| 01***08 | Nut | 2 |
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Cooling System : Water Pump And Cooling Fan
| 01***16 | Screw | 5 |
| 01***20 | Screw | 2 |
| 01***35 | Screw | 4 |
Cylinder Block
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Cylinder Block : Camshaft And Tappet
| 01***20 | Screw | 2 |
| 04***16 | Fitting Wedge | 1 |
| 62***01 | Camshaft Ass'Y | 1 |
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Cylinder Block : Crankshaft
| 61***20 | Bolt | 1 |
| 62***00 | Main Metal Ass'Y | 5 |
| 62***00 | Thrust Metal Ass'Y | 1 |
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Cylinder Block : Cylinder Block
| 01***14 | Bolt | 2 |
| 01***20 | Screw | 1 |
| 01***06 | Nut | 1 |
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Cylinder Block : Cylinder Block (Cold Terrain Spec.)
| 01***14 | Bolt | 2 |
| 01***20 | Screw | 1 |
| 01***25 | Bolt,(With Corrosion Resistor) | 4 |
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Cylinder Block : Flywheel And Flywheel Housing
| 01***30 | Bolt | 6 |
| 01***30 | Bolt - Lower Oil Cooler Outlet Tubemounting | 11 |
| 07***15 | Plug,(For Without Air Compressor) | 1 |
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Cylinder Block : Front Cover And Gear (For 25a Hardening Pulley Alternator) (For 35a? 50a Alternator)
| 01***70 | Bolt,(For 75a Alternator) | 1 |
| 01***16 | Bolt | 2 |
| 01***20 | Bolt,(With Tachometer Outlet) | 8 |
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Cylinder Block : Front Cover And Gear (For 25a Non Hardening Pulley Alternator)
| 01***70 | Bolt,(For 75a Alternator) | 1 |
| 01***16 | Bolt | 2 |
| 01***20 | Bolt,(With Tachometer Outlet) | 8 |
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Cylinder Block : Oil Pan
| 01***14 | Bolt | 24 |
| 01***16 | Screw | 24 |
| 07***23 | O-Ring,(F4350-61a1b-29 ) | 1 |
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Cylinder Block : Oil Pan (Cold Terrain Spec.)
| 01***14 | Bolt | 24 |
| 01***16 | Screw | 24 |
| 07***23 | O-Ring,(F4350-61a1b-29 ) | 1 |
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Cylinder Block : Piston And Connecting Rod
| 04***12 | Ring, Snap | 8 |
| 62***00 | Piston Ring Ass'Y,Per Cylinder | 4 |
| 62***01 | Piston Ring Ass'Y,Per Cylinder | 4 |
Cylinder Head
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Cylinder Head : Air Cleaner (Double Element Type) (Sandy And Dusty Spec.)
| 01***20 | Bolt,(For Japan Pc200) | 2 |
| 07***09 | Clamp, Hose - At Water Pump | 2 |
| 07***89 | Clamp,Hose | 2 |
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Cylinder Head : Air Cleaner (Single Element Type)
| 01***20 | Bolt,(For Japan Pc200) | 2 |
| 04***10 | Ring,See Fig. K4010-65a0 | 1 |
| 07***09 | Clamp, Hose - At Water Pump | 2 |
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Cylinder Head : Air Intake Manifold And Connection (Double Element Type) (Sandy And Dusty Spec.)
| 01***12 | Bolt,(With Speedometer) | 4 |
| 01***25 | Bolt,(With Corrosion Resistor) | 4 |
| 01***75 | Bolt,(For Shipping) | 8 |
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Cylinder Head : Air Intake Manifold And Connection (Single Element Type)
| 01***12 | Bolt,(With Speedometer) | 4 |
| 01***25 | Bolt,(With Corrosion Resistor) | 4 |
| 01***75 | Bolt,(For Shipping) | 8 |
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Cylinder Head : Cylinder Head
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 4 |
| 02***04 | Plug, Pipe | 1 |
| 07***08 | Plug, Expansion | 4 |
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Cylinder Head : Cylinder Head Cover
| 07***09 | Clamp, Hose | 2 |
| 61***10 | Cap, Oil Filler | 1 |
| 61***20 | Hose | 1 |
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Cylinder Head : Exhaust Manifold And Muffler
| 01***25 | Grub Screw | 4 |
| 01***45 | Bolt, Bracket Mounting | 7 |
| 01***95 | Bolt,(For Shipping) | 1 |
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Cylinder Head : Rocker Arm
| 01***12 | Bolt,(Without R.P.C.U.) | 1 |
| 01***65 | Bolt,(For Alternator Bracket Mount) | 5 |
| 61***30 | Nut | 8 |
Electrical System
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Electrical System : Alternator (35a)
| 60***40 | Alternator A. (35a) | 1 |
| KD***57 | Bearing,Ball? Front | 1 |
| KD***80 | Collar | 1 |
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Electrical System : Alternator (50a)
| 60***90 | Alternator A. (50a) | 1 |
| SD***X0 | Washer | 1 |
| SD***X0 | Fan | 1 |
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Electrical System : Alternator And Mounting (25a)
| 01***35 | Bolt,(Cold Weather Spec.) | 1 |
| 01***55 | Bolt,(With Engine Stop Motor Type) | 1 |
| 01***11 | Nut,(For Center Guard) | 1 |
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Electrical System : Alternator And Mounting (25a) (Tropical Sandy And Dusty Spec.)
| 01***35 | Bolt,(Cold Weather Spec.) | 1 |
| 01***20 | Screw | 3 |
| 01***65 | Bolt,(For 35a? 25a Alternator) | 1 |
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Electrical System : Alternator And Mounting (35a)
| 01***35 | Bolt,(Cold Weather Spec.) | 1 |
| 01***20 | Screw | 4 |
| 01***65 | Bolt,(For 35a? 25a Alternator) | 1 |
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Electrical System : Alternator And Mounting (50a)
| 01***35 | Bolt,(Cold Weather Spec.) | 1 |
| 01***25 | Bolt,(With Corrosion Resistor) | 3 |
| 01***70 | Bolt,(For 50a Alternator) | 1 |
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Electrical System : Heater Signal
| 60***61 | Signal,Heater | 1 |
| 60***80 | Cap | 1 |
| 60***90 | Cap | 3 |
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Electrical System : Starting Motor (2.8kw)
| 60***30 | Starting Motor Ass'Y,(2.8kw) | 1 |
| KD***60 | Bracket,Center | 1 |
| KD***50 | Stopper,Piston | 1 |
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Electrical System : Starting Motor And Mounting
| 01***30 | Bolt | 2 |
| 07***95 | O-Ring,Transmission Strainer | 1 |
| (6***0) | Starting Motor Ass'Y,(2.8kw) (See Fig.0661) | 1 |
Engine Kit
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Engine Kit : Gasket Kit
| 01***12 | Washer,Lock (Noise Suppression Spec.) (K2) | 1 |
| 07***65 | O-Ring,Injection Pump Case | 1 |
| 07***95 | O-Ring,Transmission Strainer | 1 |
Fuel System
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Fuel System : Engine Stop Motor And Mounting
| 01***40 | Bolt,(Dust And Dirt Protection) | 2 |
| 01***14 | Bolt - Plate Mounting | 3 |
| 01***16 | Bolt - Starting Motor Ground Cable | 2 |
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Fuel System : Fuel Filter And Piping
| 01***35 | Bolt | 2 |
| 07***12 | Gasket,Mechanical Pump Piping | 1 |
| 07***12 | Gasket,(Without Air Compressor Type) (K1) | 4 |
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Fuel System : Fuel Ingection Pump (Governor) (2/2)
| DK***00 | Spring,Governor | 1 |
| DK***40 | Gasket,Air Compressor | 2 |
| DK***00 | Nut,Cap | 1 |
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Fuel System : Fuel Injection Pump (Feed Pump)
| DK***20 | Bolt, Joint | 1 |
| DK***00 | Valve,Check | 2 |
| DK***20 | Pump,Priming | 1 |
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Fuel System : Fuel Injection Pump (Governor) (1/2)
| DK***00 | Shim? 2.00mm,(High Altitude Spec.) | 0 |
| DK***00 | Adapter | 1 |
| DK***00 | Nut,Lock | 1 |
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Fuel System : Fuel Injection Pump (Pump) (1/2)
| 62***31 | Injection Pump A | 1 |
| DK***30 | Bearing | 0 |
| DK***20 | Shim, 1.40mm; Was Dk029311-7220, Shim? 1.4mm | 0 |
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Fuel System : Fuel Injection Pump (Pump) (2/2)
| 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 | 4 |
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Fuel System : Fuel Injection Pump And Piping
| 01***35 | Stud | 4 |
| 01***12 | Bolt | 2 |
| 01***25 | Screw | 2 |
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Fuel System : Fuel Nozzle And Spill Pipe
| 07***13 | Tube,Spill | 1 |
| 07***14 | Tube,Spill | 1 |
| 60***40 | Glow Plug,Glow | 4 |
Lubricating Oil System
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Lubricating Oil System : Lubricating Oil Filter
| 60***40 | Cartridge,Engine Oil Filter (D31s) | 1 |
| 60***41 | Cartridge,Engine Oil Filter (D31s) | 1 |
| 60***50 | Plate? Caution,(Russian-English) | 1 |
Komatsu : 4d95l-W-1e(S/N 11437-Up) : Lubricating Oil System : Lubricating Oil Pump And Suction Pipe
| 01***12 | Bolt,(See Fig.0501) | 1 |
| 01***16 | Screw | 6 |
| 01***25 | Bolt,(With Corrosion Resistor) | 1 |
4D95L-W-1E(S/N 11437-UP) serial number reference
The engine PIN plate is riveted to the engine block, typically on the left side near the injection pump or on the valve cover. Read the prefix (e.g., WA70-1) to identify the host machine family, then match the engine serial number (starting at 10001 for the 4D95L-W-1E) to confirm the specific engine variant and generation.
| Prefix | Identifies | Notes |
|---|---|---|
| WA70-1 | Wheel Loader | WA70-1 wheel loader equipped with 4D95L-W-1E engine. Serial range 10001-Up. Source: Komatsu Wheel Loader Equipment Guide (published references). Note: Source lists WA70-1 twice for this engine; verify specific sub-configuration with dealer. |
Frequently asked questions
What engine does the Komatsu 4D95L-W-1E (S/N 11437-UP) use?
It uses the Komatsu 4D95L-W-1E, a 3.3-liter, 4-cylinder diesel engine with 45 to 60 kW (60 to 80 hp) output, part of the 95 Series family.
What is the operating weight of machines using this engine?
Operating weight varies by configuration and series. For the PC60 class, it is approximately 6,180 kg (13,624 lb). For the WA70-1 wheel loader, it ranges from 34,000 to 35,000 kg (74,957 to 77,162 lb).
What replaced the Komatsu 4D95L-W-1E?
The 4D95L-W-1E is part of the 95 Series family. It has been succeeded by newer emissions-compliant engines in the SAA4D95LE and SA6D102E families for modern excavator and loader models.
What 4D95L-W-1E(S/N 11437-UP) owners discuss
What is the primary powertrain and hydraulic behavior associated with the Komatsu 4D95L-W-1E engine in WA70-1 wheel loaders?
What are the typical undercarriage and wear patterns for the WA70-1 wheel loader series?
What are the known engine quirks for the 4D95L-W-1E series compared to earlier 4D95 variants?
What are the common electrical and sensor issues reported for machines using this engine?
What should be checked when buying a used WA70-1 with the 4D95L-W-1E engine?
What are the fluid specifications and capacity considerations for this engine?
What safety-critical fix is associated with the cooling system on this engine?
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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