Komatsu 4D95L-1C(S/N 10001-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu 4D95L-1C is a compact crawler hydraulic excavator powered by the 4D95L-1 series diesel engine, producing approximately 60 HP (44.7 kW). Operating in the 6,000 to 6,500 kg weight class, this machine was produced primarily during the late 1980s and 1990s, serving as the successor to earlier PC60-1/2 models and the predecessor to the PC60-5 series. Configurations included standard and long-reach booms, varying stick lengths, and optional dozer blade attachments for grading. The 4D95L-1C engine variant specifically identifies the serial range 10001-UP for the PC60-3 model.
Across the 95 Series engine family, generations transitioned from naturally aspirated to turbocharged and aftercooled configurations to meet emissions standards and improve thermal efficiency. The 4D95L-1C remains critical in the used and parts market because its simple, mechanical fuel injection system lacks complex electronic controls, making it highly repairable. Its widespread use in the PC60 line ensures a robust aftermarket ecosystem for undercarriage components, hydraulic pumps, and engine rebuild parts, sustaining its value long after factory support for the specific serial range has diminished.
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-1C(S/N 10001-UP) specifications
Engine
| Model | 4D95L-1C |
| Arrangement | 4 cylinder in line engine |
| Displacement | 2.690 liter (164.1 cu in) |
| Bore | 95 mm (3.74 in) |
| Stroke | 95 mm (3.74 in) |
| Gross Power | 28 kW (37.5 hp) @ 2450 rpm to 33 kW (44.3 hp) @ 2800 rpm |
| Net Power | 44 kW (59 hp) @ 2200 rpm |
| Emissions Tier | Not documented for this exact serial range — verify with your dealer |
Weights
| Operating Weight | 6,000–6,500 kg (13,228–14,330 lb) |
| Ground Pressure | Not documented for this exact serial range — verify with your dealer |
| Transport Weight | 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 |
| Tail Swing Radius | Not documented for this exact serial range — verify with your dealer |
| Track Shoe Width | Not documented for this exact serial range — verify with your dealer |
| Ground Clearance | Not documented for this exact serial range — verify with your dealer |
| Undercarriage Length | Not documented for this exact serial range — verify with your dealer |
Performance
| Max Dig Depth | 3,400–3,600 mm (11.15–11.81 ft) |
| Max Reach at Ground | 5,900–6,100 mm (19.36–20.01 ft) |
| Max Dump Height | Not documented for this exact serial range — verify with your dealer |
| Max Cutting Height | Not documented for this exact serial range — verify with your dealer |
| Swing Speed | 11 rpm |
| Travel Speed | 4.2 km/h (2.61 mph) |
| Gradeability | Not documented for this exact serial range — verify with your dealer |
| Drawbar Pull | Not documented for this exact serial range — verify with your dealer |
Forces
| Bucket Digging Force | Not documented for this exact serial range — verify with your dealer |
| Stick/Arm Digging Force | Not documented for this exact serial range — verify with your dealer |
Service Capacities (Summary)
| Fuel Tank | 95 L (25.1 gal) |
| Hydraulic System/Tank | 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-1C(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 4D95L-1C(S/N 10001-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
Implement KOWA fluid analysis at every 500-hour interval to monitor wear metals in the 4D95L-1C engine and hydraulic system. Track iron and copper levels to detect cylinder liner or bearing wear before failure. Analyze hydraulic oil for viscosity changes and water contamination, which accelerate pump failure in this series. Monitor coolant SCA concentration to prevent cavitation erosion in the 3.05L block. Use KOMTRAX telematics to correlate load frequency with fluid degradation rates, adjusting service intervals based on actual duty cycles rather than fixed hours.
Corrective & Common Repairs
Address frequent 4D95L-1C failures by inspecting the fuel injection pump plunger and barrel for wear, which causes hard starting and black smoke. Replace worn hydraulic hose clamps and check the oil cooler core for clogging that leads to overheating. Inspect the turbocharger shaft play and seal condition, as boost leaks reduce torque output. Check the swing bearing bolts for loosening and the travel motor case drain filters for metal debris. Repair cracked cylinder heads or cracked engine mounts caused by vibration in this compact frame.
Overhaul & Rebuild Points
Plan major engine overhaul for the 4D95L-1C when compression pressure drops below specification or blow-by pressure exceeds limits. Rebuild the hydraulic main pump when flow rates fall below 80% of nominal capacity or internal leakage is detected. Replace undercarriage components when track pitch elongation exceeds 3% or sprocket teeth become hooked. Inspect the swing reducer gears for pitting and replace seals to prevent oil contamination. Rebuild travel motors when case drain flow indicates internal bypassing.
Seasonal & Environment Servicing
In cold climates, use low-viscosity engine oil and ensure the coolant mixture provides adequate freeze protection for the 4D95L-1C aluminum components. In dusty environments, service the air cleaner more frequently and check the pre-cleaner intake. In high-humidity conditions, drain the fuel water separator daily to prevent microbial growth in the tank. Inspect rubber tracks for UV cracking and check hydraulic seals for drying in high-heat applications. Adjust track tension to prevent excessive wear on the idler and sprocket in abrasive soil conditions.
4D95L-1C(S/N 10001-UP) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 07281-00197 | Clamp,(With Pre-Fuel Filter) | Fuel system service | Check fitment → |
| 600-311-6220 | Cartridge,Fuel Filter | Fuel system service | Check fitment → |
| 600-311-9600 | Fuel Filter Ass'Y | Fuel system service | Check fitment → |
| 07000-02135 | O-Ring,Hydraulic Oil Filter | Hydraulic service | Check fitment → |
| 6204-61-5190 | Gasket,Oil Cooler Element | Lubrication service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
4D95L-1C(S/N 10001-UP) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| CA115 | Engine crankshaft speed sensor failure | Broken sensor, wiring issue, or connector corrosion | Replace the speed sensor and verify the voltage at the pin connector |
| CA441 | Battery voltage too low | Weak battery or charging system failure | Replace the battery or alternator and check the voltage regulator |
| CA442 | Battery voltage too high | Faulty voltage regulator or alternator | Replace the alternator or battery and check the voltage regulator |
| CA122 | Intake air pressure high voltage | Sensor malfunction or actual overpressure condition | Verify the intake pressure sensor and wiring |
| CA123 | Intake air pressure low voltage | Sensor short or airflow restriction | Check for a sensor short or an airflow restriction |
| 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 | Malfunction in the rail sensor or low pressure condition | Diagnose the fuel rail pressure sensor or pump lines |
| AA10NX | Air cleaner clogging | Dirty or blocked air filter element | Replace the air filter |
| CA234 | Engine overspeed | Throttle calibration error, engine load cycle issue, or operator misuse | Verify throttle calibration, engine load cycle, or operator misuse |
| CA111 | Internal engine controller fault | ECM internal failure | Replace or reprogram the ECM |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
4D95L-1C(S/N 10001-UP) attachments & work tools
Buckets
The Komatsu PC60-3 excavator equipped with the 4D95L-1C engine (S/N 10001-Up) utilizes a bucket capacity range of 0.2–0.3 m³. Operating weight for this machine class is approximately 6,000–6,500 kg, which dictates the compatible bucket width and volume limits for standard heavy-duty or grading applications.
Hydraulic hammers
For the 6,000–6,500 kg operating weight class of the PC60-3, compatible hydraulic hammers typically fall within the 1,000–2,000 lb breaker weight class. Selection must align with the machine's rated power of 44–45 kW (60 HP) to ensure adequate hydraulic flow and pressure for effective breaking performance.
Quick couplers
Compatible quick couplers for this excavator class include manual, S-Lock hydraulic, and S-Lock hydraulic tilt types. These couplers are engineered to integrate with major OEM specifications for the PC60 series, ensuring secure attachment retention for buckets and other tools.
Thumbs/grapples
Compatible thumb options for this machine class include main pin hydraulic thumbs, progressive (Pro) link hydraulic thumbs, and weld-on hydraulic/manual thumbs. These attachments are designed to enhance material handling and grading capabilities for the PC60 series excavator.
Rippers
Available ripper attachments for this excavator class include frost rippers and ripper hooks. These tools are designed for land clearing and soil penetration tasks, compatible with the mounting interface of the PC60 series.
Hydraulic-kit notes
The machine utilizes Komatsu EO, TO, and AXO hydraulic fluids. High-flow circuits for attachments must be verified against the specific PC60-3 hydraulic system specifications, as the 4D95L-1C engine provides 44–45 kW of power to drive the hydraulic pump.
All 4D95L-1C(S/N 10001-UP) assemblies by section
Every catalogued assembly group for the Komatsu 4D95L-1C(S/N 10001-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Cooling System
Komatsu : 4d95l-1c(S/N 10001-Up) : Cooling System : Water Pump And Cooling Fan
| 01***16 | Screw | 5 |
| 01***20 | Screw | 2 |
| 01***25 | Bolt,(With Corrosion Resistor) | 4 |
Cylinder Block
Komatsu : 4d95l-1c(S/N 10001-Up) : Cylinder Block : Camshaft And Tappet
| 01***20 | Screw | 2 |
| 04***16 | Fitting Wedge | 1 |
| 62***01 | Camshaft Ass'Y | 1 |
Komatsu : 4d95l-1c(S/N 10001-Up) : Cylinder Block : Crankshaft
| 61***20 | Bolt | 1 |
| 62***00 | Main Metal Ass'Y | 5 |
| 62***00 | Thrust Metal Ass'Y | 1 |
Komatsu : 4d95l-1c(S/N 10001-Up) : Cylinder Block : Cylinder Block
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 8 |
| 01***14 | Bolt | 2 |
| 04***20 | Pin,Dowel (Welded) | 2 |
Komatsu : 4d95l-1c(S/N 10001-Up) : Cylinder Block : Flywheel And Flywheel Housing
| 01***50 | Bolt | 6 |
| 01***30 | Bolt - Lower Oil Cooler Outlet Tubemounting | 11 |
| 01***45 | Bolt, Bracket Mounting | 8 |
Komatsu : 4d95l-1c(S/N 10001-Up) : Cylinder Block : Front Cover And Gear
| 01***70 | Bolt,(For 75a Alternator) | 1 |
| 01***16 | Bolt | 2 |
| 01***20 | Bolt,(With Tachometer Outlet) | 6 |
Komatsu : 4d95l-1c(S/N 10001-Up) : Cylinder Block : Oil Pan
| 01***16 | Screw | 24 |
| 09***50 | Liquid Gasket, Lg-7, 150g | 0 |
| 62***10 | Pan,Oil | 1 |
Komatsu : 4d95l-1c(S/N 10001-Up) : Cylinder Block : Piston And Connecting Rod
| 04***12 | Ring, Snap | 8 |
| 62***21 | Piston (S) | 4 |
| 62***00 | Piston Ring Ass'Y,Per Cylinder | 4 |
Cylinder Head
Komatsu : 4d95l-1c(S/N 10001-Up) : Cylinder Head : Air Cleaner
| 04***10 | Ring,See Fig. K4010-65a0 | 1 |
| 60***00 | Element Ass'Y,Outer | 1 |
| 60***60 | Gasket | 1 |
Komatsu : 4d95l-1c(S/N 10001-Up) : Cylinder Head : Air Intake Manifold And Connection
| 01***65 | Stud | 1 |
| 01***12 | Bolt,(With Speedometer) | 4 |
| 01***65 | Bolt,(With Water Separator) | 1 |
Komatsu : 4d95l-1c(S/N 10001-Up) : Cylinder Head : Cylinder Head
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 4 |
| 02***04 | Plug | 1 |
| 07***08 | Plug, Expansion | 4 |
Komatsu : 4d95l-1c(S/N 10001-Up) : Cylinder Head : Cylinder Head Cover
| 61***10 | Cap, Oil Filler | 1 |
| 61***20 | Nut | 3 |
| 61***30 | Washer,(B) | 3 |
Komatsu : 4d95l-1c(S/N 10001-Up) : Cylinder Head : Exhaust Manifold And Muffler
| 01***70 | Bolt, Spacer | 1 |
| 01***25 | Grub Screw | 3 |
| 01***45 | Bolt, Bracket Mounting | 8 |
Komatsu : 4d95l-1c(S/N 10001-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-1c(S/N 10001-Up) : Electrical System : Alternator (25a)
| 60***41 | Alternator A. (25a) | 1 |
| KD***52 | Bolt,Through | 3 |
| KD***70 | Rear Bracket Ass'Y | 1 |
Komatsu : 4d95l-1c(S/N 10001-Up) : Electrical System : Alternator And Mounting
| 01***30 | Bolt,(For Trimming Dozer) | 1 |
| 01***50 | Bolt,(With Corrosion Resistor) | 1 |
| 01***11 | Nut,(For Center Guard) | 1 |
Komatsu : 4d95l-1c(S/N 10001-Up) : Electrical System : Heater Switch And Heater Signal
| 60***70 | Switch,Air Intake Heater | 1 |
| 60***30 | Signal,Engine Pre Heater | 1 |
| 60***80 | Cap | 1 |
Komatsu : 4d95l-1c(S/N 10001-Up) : Electrical System : Starting Motor (2.8kw)
| 60***30 | Starting Motor Ass'Y,(2.8kw) | 1 |
| KD***01 | Washer,Seal | 2 |
| KD***42 | Screw | 4 |
Komatsu : 4d95l-1c(S/N 10001-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-1c(S/N 10001-Up) : Engine Kit : Gasket Kit
| 01***12 | Washer,Lock (Noise Suppression Spec.) (K2) | 1 |
| 07***18 | O-Ring,(See Fig.1601-29?1602-17) | 1 |
| 07***20 | O-Ring,Relief Valve | 1 |
Fuel System
Komatsu : 4d95l-1c(S/N 10001-Up) : Fuel System : Fuel Filter
| 01***65 | Bolt,(With Water Separator) | 2 |
| 07***12 | Gasket,Mechanical Pump Piping | 1 |
| 07***12 | Gasket,(Without Air Compressor Type) (K1) | 4 |
Komatsu : 4d95l-1c(S/N 10001-Up) : Fuel System : Fuel Injection Pump And Piping
| 01***35 | Stud | 4 |
| 01***12 | Bolt | 2 |
| 01***25 | Screw | 2 |
Komatsu : 4d95l-1c(S/N 10001-Up) : Fuel System : Nozzle Holder
| 01***35 | Bolt, Mount Bracket To Floor | 4 |
| 07***10 | Tube,(See Fig.0421-14) | 3 |
| 07***10 | Tube,Spill | 1 |
Lubricating Oil System
Komatsu : 4d95l-1c(S/N 10001-Up) : Lubricating Oil System : Lubricating Oil Cooler
| 01***25 | Bolt,(With Corrosion Resistor) | 4 |
| 01***30 | Bolt,(Water Separator Spec.) | 7 |
| 01***50 | Bolt,(With Corrosion Resistor) | 1 |
Komatsu : 4d95l-1c(S/N 10001-Up) : Lubricating Oil System : Lubricating Oil Filter
| 60***40 | Cartridge,Engine Oil Filter (D31s) | 1 |
| 62***10 | Nipple | 1 |
Komatsu : 4d95l-1c(S/N 10001-Up) : Lubricating Oil System : Lubricating Oil Pump And Suction Pipe
| 01***12 | Bolt,(See Fig.0501) | 1 |
| 01***16 | Screw | 6 |
| 62***00 | Oil Pump Ass'Y | 1 |
4D95L-1C(S/N 10001-UP) serial number reference
The engine serial number plate is typically located on the left side of the engine block or on a metal data plate affixed to it. The prefix is the initial sequence of digits on this plate; for the 4D95L-1C family, the serial range begins at 10001. Cross-reference this with the machine's chassis serial number plate, usually found on the right-hand side of the cab lower frame or stamped on the front frame between the hydraulic arms.
| Prefix | Identifies | Notes |
|---|---|---|
| 10001-UP | 4D95L-1C | Engine serial range for the 4D95L-1C engine. This engine is used in the Komatsu PC60-3 excavator (equipment serial 18001-UP). The base model designation is 4D95L-1. No distinct 3-character PIN prefixes are documented for this specific engine serial range in the provided sources; the serial number itself (starting at 10001) serves as the primary identifier. Verify with your dealer for exact machine-level PIN prefixes. |
Frequently asked questions
What engine does the Komatsu 4D95L-1C use?
The Komatsu 4D95L-1C uses the 4D95L-1 series diesel engine, a 3.05L displacement unit producing approximately 60 HP (44.7 kW) at 2,200 rpm.
What is the operating weight of this excavator?
The operating weight varies by configuration and attachment package, typically ranging from 6,000 to 6,500 kg (13,228 to 14,330 lbs).
What model replaced the 4D95L-1C equipped excavators?
The PC60-5 series, equipped with the 4D95L-1K engine, succeeded the PC60-3 (4D95L-1C) model in Komatsu's lineup.
What 4D95L-1C(S/N 10001-UP) owners discuss
What is the engine configuration and cylinder liner design for the Komatsu 4D95L-1C(S/N 10001-UP)?
What are the typical powertrain and hydraulic behaviors reported for this machine?
What undercarriage and wear patterns are common for this excavator class?
What are the known engine quirks for the 4D95L-1 series?
What are the common electrical and sensor issues?
What should be checked when buying a used 4D95L-1C(S/N 10001-UP)?
What safety-critical fix is associated with the cooling system?
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
Need a specific 4D95L-1C(S/N 10001-UP) part?
Search live OEM part data, check fitment, and cross-reference alternatives with Heavy Parts AI.