Komatsuengine(no series)

Komatsu 4D95L-1CC(S/N 49965-UP)

Maintenance schedule, common problems & OEM parts breakdown

The Komatsu 4D95L-1CC engine (S/N 49965-UP) is a 4-cylinder, liquid-cooled, turbocharged diesel powerplant belonging to the 95 Series family. It is primarily installed in the PC60, PC60L, and PC70 series crawler excavators, as well as the WA40 and WA70 wheel loaders. These machines typically fall into the 6 to 10 ton operating weight class. The 4D95L-1CC succeeded earlier 4D95L variants in the PC60-5 and PC60-6 lines and was eventually replaced by the 4D95LE-3 series in later PC60-7 and PC70-7 generations. Configurations offered include standard and low-ground-pressure undercarriage options, with the engine itself varying slightly by regional emissions requirements but maintaining the same core block architecture.

Across the 95 Series generations, the primary changes involved emissions compliance upgrades, moving from Tier 2/Stage II to Tier 3/Stage IIIA standards, which necessitated changes to the fuel injection system and exhaust aftertreatment. The 4D95L-1CC remains critical in the used and parts market because it powers a high-volume, durable machine class that is still widely active in general construction and utility work. Its simple, non-complex fuel system and robust cast-iron block make it a favorite for independent rebuilds, while the high production numbers of the PC60/70 series ensure a steady supply of used cores and aftermarket components.

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-1CC(S/N 49965-UP) specifications

Engine

Model4D95L-1 (per 95 Series Diesel Engine Shop Manual; 4D95L-1CC S/N 49965-UP catalog variant)
Arrangement4 cylinder in line
Displacement2.690 liter
Bore95 mm
Stroke95 mm
Power28 kW (39 hp) @ 2450 rpm to 33 kW (45 hp) @ 2800 rpm (varies by configuration/series)
Torque155 Nm @ 1300 rpm to 150 Nm @ 2000 rpm (varies by configuration/series)
Emissions TierNot documented for this exact serial range — verify with your dealer

Weights

Engine Weight (approx)270-285 kg
Operating WeightNot documented for this exact serial range — verify with your dealer
Shipping WeightNot documented for this exact serial range — verify with your dealer
Ground PressureNot documented for this exact serial range — verify with your dealer

Dimensions

Engine Length (approx)767-783 mm
Engine Width (approx)529-598 mm
Engine Height (approx)750-972 mm
Transport LengthNot documented for this exact serial range — verify with your dealer
Transport WidthNot documented for this exact serial range — verify with your dealer
Transport HeightNot documented for this exact serial range — verify with your dealer
Track GaugeNot documented for this exact serial range — verify with your dealer
Ground ClearanceNot documented for this exact serial range — verify with your dealer

Performance

Travel SpeedsNot documented for this exact serial range — verify with your dealer
GradeabilityNot documented for this exact serial range — verify with your dealer
Dig DepthNot documented for this exact serial range — verify with your dealer
Bucket Breakout ForceNot documented for this exact serial range — verify with your dealer

Service capacities (summary)

Fuel TankNot documented for this exact serial range — verify with your dealer
Hydraulic SystemNot documented for this exact serial range — verify with your dealer
Engine OilNot documented for this exact serial range — verify with your dealer
Cooling SystemNot 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-1CC(S/N 49965-UP) maintenance schedule

Service intervalTasks
Every 10 h
  • Check engine oil level and condition.
  • Check hydraulic fluid level at sight glass.
  • Check coolant level and ensure cap is secure.
  • Drain water from fuel separator.
  • Check air filter restriction indicator.
  • Inspect hydraulic hoses for cracks or leaks.
Every 250 h
  • Change engine oil and replace filter.
  • Grease all pivot points on boom, stick, and bucket.
  • Inspect fan belt tension and condition.
  • Check all fluid levels (hydraulic, coolant, fuel).
  • Inspect undercarriage for loose pins or excessive wear.
  • Clean debris from radiator and oil cooler fins.
Every 500 h
  • Replace fuel filter and drain water separator.
  • Replace hydraulic return filter.
  • Test battery load and clean terminals.
  • Test coolant SCA concentration.
  • Collect KOWA oil sample for analysis.
  • Inspect all belts, hoses, and clamps for wear.
Every 1,000 h
  • Replace engine air filter outer element.
  • Inspect turbocharger for shaft play and leaks.
  • Check valve clearance and adjust if necessary.
  • Measure undercarriage wear and track tension.
  • Inspect structural welds on boom and stick.
  • Check final drive oil level and condition.
Every 2,000 h
  • Change hydraulic system oil.
  • Flush and replace engine coolant.
  • Replace hydraulic oil filter.
  • Inspect swing machinery for wear.
  • Check travel system for abnormal noise or vibration.
  • Perform comprehensive component evaluation.

Servicing the 4D95L-1CC(S/N 49965-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 SCA concentration in the cooling system to prevent cavitation in the 4D95L-1CC cylinder liners. Monitor hydraulic oil particle count to protect the high-pressure injection pump. Track fuel consumption trends to detect injector wear early. Use KOMTRAX telematics to identify load spikes that accelerate fluid degradation. Maintain strict fluid cleanliness to extend the life of the turbocharger and fuel system components.

Corrective & Common Repairs

Address excessive blow-by by inspecting piston rings and cylinder liner wear on the 4D95L-1CC. Replace worn injector nozzles if exhaust smoke color changes or power drops. Check the turbocharger shaft play and replace seals if oil leaks into the intake. Inspect the fuel lift pump diaphragm for leaks that cause hard starting. Repair hydraulic hose cracks near the swing joint to prevent fluid loss. Replace worn track rollers and idlers to correct undercarriage alignment and reduce drivetrain strain.

Overhaul & Rebuild Points

Perform an inframe overhaul when compression pressure drops below specification or blow-by exceeds limits. Replace piston rings, liners, and bearings on the 4D95L-1CC block. Inspect the crankshaft for journal wear and polish or replace as needed. Recondition the cylinder head, resurfacing the deck and replacing valve guides. Check the camshaft lobes for wear and replace the timing gears if backlash is excessive. Rebuild the fuel injection pump if calibration data falls outside factory tolerances.

Seasonal & Environment Servicing

In cold climates, use low-viscosity engine oil and ensure the coolant mixture provides adequate freeze protection for the 4D95L-1CC. Preheat the engine block before starting in freezing temperatures to reduce wear. In dusty environments, service the air filter more frequently and check the pre-cleaner. In high-humidity areas, drain the fuel separator daily to prevent water contamination. Inspect the radiator and oil cooler cores for insect or debris buildup that restricts airflow. Check the battery for electrolyte levels and corrosion in humid conditions.

4D95L-1CC(S/N 49965-UP) common service parts

Part numberPart
07281-00197Clamp,(With Pre-Fuel Filter)Check fitment →
600-311-1190Plate? Caution,Fuel FilterCheck fitment →
600-311-7440Cartridge,Fuel FilterCheck fitment →
6204-73-6200Fuel Filter Ass'YCheck fitment →
09637-30161Plate? Instruction,Air Cleaner (Single Element)Check fitment →

Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.

4D95L-1CC(S/N 49965-UP) fault codes & troubleshooting

CodeMeaningLikely causeWhat to do
CA115Engine crankshaft speed sensor failureBroken sensor, wiring issue, or connector corrosionReplace the speed sensor and verify the voltage at the pin connector
CA451Common rail pressure sensor feedback value too highMalfunction in the rail sensor or actual overpressure conditionDiagnose the fuel rail pressure sensor or pump lines
CA111Internal engine controller faultECM internal abnormalityReplace or reprogram the ECM
AA10NXAir cleaner cloggingBlocked air filter elementReplace the air filter
CA234Engine overspeedThrottle calibration error, engine load cycle issue, or operator misuseVerify throttle calibration and engine load cycle
CA441Battery voltage too lowWeak battery or charging system failureReplace the alternator or battery; check the voltage regulator
CA122Intake air pressure high voltageSensor malfunction or wiring issueVerify the intake pressure sensor and wiring
CA123Intake air pressure low voltageSensor short or airflow restrictionCheck for a sensor short or an airflow restriction
CA2311IMV solenoid valve failureFaulty IMV solenoid or wire harness issueReplace the IMV solenoid or inspect the wire harness
CA153Intake air temperature sensor error (high)Sensor malfunctionReplace or test the IAT sensor

Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.

4D95L-1CC(S/N 49965-UP) attachments & work tools

Excavator Attachments

The 4D95L-1CC engine is primarily associated with the PC100-1 and PC120 series crawler excavators. Typical bucket capacities for this class range from 0.3 to 0.6 cubic meters (0.4 to 0.8 cubic yards). Mounting uses standard excavator quick couplers or fixed pin systems depending on the specific boom configuration.

Wheel Loader Attachments

The WA120, WA150, and WA170 wheel loaders utilize the 4D95L engine family. Standard bucket capacities for these models typically range from 1.5 to 2.5 cubic meters (2.0 to 3.3 cubic yards). Attachments include standard buckets, rock buckets, and pallet forks, mounted via the loader's quick-attach system.

Hydraulic System Configuration

Work tools require high-flow hydraulic circuits compatible with the PC100-1 and PC120 series pump outputs. Factory configurations include standard relief valve settings for digging and grading operations. Hydraulic fluid specifications follow Komatsu standards for high-pressure hydraulic systems.

Engine Guarding and Options

Factory options for this engine class include heavy-duty air cleaners (single or double element types) for dusty environments. Guarding features include engine hoods with service access points and under-hood protection for hydraulic lines. Specific guarding configurations vary by the final machine model (excavator vs. loader) rather than the engine alone.

All 4D95L-1CC(S/N 49965-UP) assemblies by section

Every catalogued assembly group for the Komatsu 4D95L-1CC(S/N 49965-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Cooling System
Komatsu : 4d95l-1cc(S/N 49965-Up) : Cooling System : Water Pump And Cooling Fan(#49969-)
01***16Screw5
01***20Screw2
01***45Bolt6
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Cylinder Block
Komatsu : 4d95l-1cc(S/N 49965-Up) : Cylinder Block : Camshaft And Tappet
01***20Screw2
04***16Fitting Wedge1
62***31Thrust Washer1
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Komatsu : 4d95l-1cc(S/N 49965-Up) : Cylinder Block : Crankshaft
61***20Bolt1
62***00Main Metal Ass'Y5
62***00Thrust Metal Ass'Y1
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Komatsu : 4d95l-1cc(S/N 49965-Up) : Cylinder Block : Cylinder Block(#49969-)
01***14Bolt2
01***20Bolt,(For Japan Pc200)1
04***20Pin,Dowel (Welded)2
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Komatsu : 4d95l-1cc(S/N 49965-Up) : Cylinder Block : Flywheel And Flywheel Housing
01***30Bolt6
01***30Bolt - Lower Oil Cooler Outlet Tubemounting11
07***15Plug,(Used When Without Heater)1
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Komatsu : 4d95l-1cc(S/N 49965-Up) : Cylinder Block : Front Cover And Gear
01***70Bolt,(For 75a Alternator)1
01***16Bolt2
01***16Screw2
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Komatsu : 4d95l-1cc(S/N 49965-Up) : Cylinder Block : Front Cover And Gear (Noise Suppression Spec.)(#55962-)
01***70Bolt,(For 75a Alternator)1
01***16Bolt2
01***20Bolt,(With Tachometer Outlet)6
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Komatsu : 4d95l-1cc(S/N 49965-Up) : Cylinder Block : Oil Pan
01***14Bolt,(W/Joy Stick Str.)(W/O Heater)24
07***16Gasket,(For Pc750-6) (See Fig.A2110)1
62***11Pan,Oil1
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Komatsu : 4d95l-1cc(S/N 49965-Up) : Cylinder Block : Oil Pan (Noise Suppression Spec.)(#55962-)
01***16Bolt, Mount Solenoid Valve24
07***16Gasket,(For Pc750-6) (See Fig.A2110)1
62***11Pan,Oil1
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Komatsu : 4d95l-1cc(S/N 49965-Up) : Cylinder Block : Piston And Connecting Rod
04***12Ring, Snap8
62***01Piston Ring Ass'Y,Per Cylinder4
62***02Piston Ring Ass'Y,Per Cylinder4
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Cylinder Head
Komatsu : 4d95l-1cc(S/N 49965-Up) : Cylinder Head : Air Cleaner (Double Element Type)(#59833-)
04***10Ring,See Fig. K4010-65a01
09***61Plate? Instruction,(Japanese-English) (Not Shown)1
09***61Plate? Instruction,Air Cleaner (Single Element)1
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Komatsu : 4d95l-1cc(S/N 49965-Up) : Cylinder Head : Air Cleaner (Single Element Type)
04***10Ring,See Fig. K4010-65a01
09***61Plate? Instruction,(Japanese-English)1
60***40Element Ass'Y,(Double Element)(Not Shown)1
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Komatsu : 4d95l-1cc(S/N 49965-Up) : Cylinder Head : Air Intake Manifold And Connection
01***25Stud1
01***12Bolt,(With Speedometer)4
01***25Bolt,(With Corrosion Resistor)3
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Komatsu : 4d95l-1cc(S/N 49965-Up) : Cylinder Head : Cylinder Head
01***20Bolt, Hose Clamps (Inlet And Return Line Hoses)2
01***25Bolt, Mount Engine Oil Drain To Fuel Tank2
01***32Washer, (Without Emergency Steering)17
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Komatsu : 4d95l-1cc(S/N 49965-Up) : Cylinder Head : Cylinder Head Cover
61***10Cap, Oil Filler1
61***20Screw3
61***30Washer,(B)3
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Komatsu : 4d95l-1cc(S/N 49965-Up) : Cylinder Head : Exhaust Manifold And Muffler
01***25Grub Screw4
01***25Bolt, Mount Engine Oil Drain To Fuel Tank2
01***45Bolt, Bracket Mounting7
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Komatsu : 4d95l-1cc(S/N 49965-Up) : Cylinder Head : Exhaust Manifold And Muffler (Noise Suppression Spec.)(#55962-)
01***25Grub Screw4
01***25Bolt, Mount Engine Oil Drain To Fuel Tank2
01***45Bolt, Bracket Mounting7
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Komatsu : 4d95l-1cc(S/N 49965-Up) : Cylinder Head : Exhaust Manifold And Muffler (With 35a Alternator)(#69608-)
01***25Grub Screw5
01***25Bolt, Mount Engine Oil Drain To Fuel Tank2
01***45Bolt, Bracket Mounting7
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Komatsu : 4d95l-1cc(S/N 49965-Up) : Cylinder Head : Rocker Arm
01***65Bolt,(For Alternator Bracket Mount)5
61***30Circlip2
62***00Shaft Ass'Y1
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Electrical System
Komatsu : 4d95l-1cc(S/N 49965-Up) : Electrical System : Alternator (15a)(#102171-)
60***50Alternator A. (15a)1
KD***70Cover1
KD***30Retainer1
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Komatsu : 4d95l-1cc(S/N 49965-Up) : Electrical System : Alternator (15a)(#49965-102170)
60***70Alternator A. (15a),(See Fig.0641)1
KD***70Cover1
KD***30Retainer1
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Komatsu : 4d95l-1cc(S/N 49965-Up) : Electrical System : Alternator (25a)(#55966-)
60***20Alternator A. (25a),(With Non Hardening Pulley)1
KD***57Bearing,Ball? Front1
KD***11Rear Bracket Ass'Y1
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Komatsu : 4d95l-1cc(S/N 49965-Up) : Electrical System : Alternator (35a)(#69608-)
60***20Alternator A. (35a),(With Non Hardening Pulley)1
KD***57Bearing,Ball? Front1
KD***80Collar1
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Komatsu : 4d95l-1cc(S/N 49965-Up) : Electrical System : Alternator And Mounting (15a)
01***25Bolt,(With Corrosion Resistor)4
01***65Bolt,(For 35a? 25a Alternator)1
01***95Bolt1
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Komatsu : 4d95l-1cc(S/N 49965-Up) : Electrical System : Alternator And Mounting (25a) (With Safety Cover)(#62826-)
01***40Bolt,(Cold Weather Spec.)1
01***25Bolt,(With Corrosion Resistor)3
01***60Screw1
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Komatsu : 4d95l-1cc(S/N 49965-Up) : Electrical System : Alternator And Mounting (25a)(#59236-)
01***35Bolt,(Cold Weather Spec.)1
01***25Bolt,(With Corrosion Resistor)3
01***60Screw1
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Komatsu : 4d95l-1cc(S/N 49965-Up) : Electrical System : Alternator And Mounting (35a)(#69608-)
01***30Bolt,(For Trimming Dozer)1
01***25Bolt,(With Corrosion Resistor)3
01***70Bolt,(For 50a Alternator)1
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Komatsu : 4d95l-1cc(S/N 49965-Up) : Electrical System : Starting Motor (2.8kw)
60***10Starting Motor Ass'Y,(2.8kw)1
KD***60Bracket,Center1
KD***50Stopper,Piston1
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Komatsu : 4d95l-1cc(S/N 49965-Up) : Electrical System : Starting Motor And Mounting (2.8kw)
01***14Bolt,(With Corrosion Resistor)1
01***30Bolt2
07***95O-Ring,Transmission Strainer1
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Engine Kit
Komatsu : 4d95l-1cc(S/N 49965-Up) : Engine Kit : Gasket Kit (Noise Suppression Spec.)(#55962-)
01***12Washer,Lock (Noise Suppression Spec.) (K2)1
07***18O-Ring,(See Fig.1601-29?1602-17)1
07***20O-Ring,Relief Valve1
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Komatsu : 4d95l-1cc(S/N 49965-Up) : Engine Kit : Gasket Kit(#49969-)
01***12Washer,Lock (Noise Suppression Spec.) (K2)1
07***18O-Ring,(See Fig.1601-29?1602-17)1
07***20O-Ring,Relief Valve1
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Fuel System
Komatsu : 4d95l-1cc(S/N 49965-Up) : Fuel System : Fuel Filter And Piping
01***20Bolt2
07***12Gasket,(Without Air Compressor Type) (K1)6
07***14Bolt,Joint2
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Komatsu : 4d95l-1cc(S/N 49965-Up) : Fuel System : Fuel Injection Pump (Feed Pump)(#49969-)
DK***20Bolt, Joint1
DK***00Valve,Check2
DK***20Pump,Priming1
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Komatsu : 4d95l-1cc(S/N 49965-Up) : Fuel System : Fuel Injection Pump (Governor) (1/2)(#49969-)
DK***00Shim? 2.00mm,(High Altitude Spec.)0
DK***00Adapter1
DK***00Nut,Lock1
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Komatsu : 4d95l-1cc(S/N 49965-Up) : Fuel System : Fuel Injection Pump (Governor) (2/2)(#49969-)
DK***40Gasket,Air Compressor2
DK***00Nut,Cap1
DK***20Cover1
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Komatsu : 4d95l-1cc(S/N 49965-Up) : Fuel System : Fuel Injection Pump (Pump) (1/2)(#49969-)
62***20Injection Pump A1
DK***30Bearing0
DK***20Shim, 1.40mm; Was Dk029311-7220, Shim? 1.4mm0
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Komatsu : 4d95l-1cc(S/N 49965-Up) : Fuel System : Fuel Injection Pump (Pump) (2/2)(#49969-)
DK***40Shim? 0.50mm, Shim, 0.50mm; Was Dk029311-00400
DK***90Shim? 0.25mm, Shim, 0.25mm; Was Dk029311-05900
DK***00Sleeve,Control4
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Komatsu : 4d95l-1cc(S/N 49965-Up) : Fuel System : Fuel Injection Pump And Piping(#49969-)
01***35Stud4
01***12Bolt2
01***25Screw2
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Komatsu : 4d95l-1cc(S/N 49965-Up) : Fuel System : Fuel Nozzle And Spill Pipe
01***35Bolt, Mount Bracket To Floor4
01***10Bolt1
07***10Tube,(See Fig.0421-14)3
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Lubricating Oil System
Komatsu : 4d95l-1cc(S/N 49965-Up) : Lubricating Oil System : Lubricating Oil Cooler(#49969-)
01***25Bolt,(With Corrosion Resistor)4
01***30Bolt,(Water Separator Spec.)7
01***50Bolt,(With Corrosion Resistor)1
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Komatsu : 4d95l-1cc(S/N 49965-Up) : Lubricating Oil System : Lubricating Oil Filter (With Oil Cooler)(#49969-)
60***41Cartridge,Engine Oil Filter (D31s)1
60***20Plate? Caution,(Italian-English)1
60***50Plate? Caution,(Russian-English)1
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Komatsu : 4d95l-1cc(S/N 49965-Up) : Lubricating Oil System : Lubricating Oil Pump And Suction Pipe
01***12Bolt,(See Fig.0501)1
01***16Screw6
01***25Bolt,(With Corrosion Resistor)1
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4D95L-1CC(S/N 49965-UP) serial number reference

The engine serial number for the 4D95L-1CC is stamped directly onto the engine block, typically on the left side near the injection pump. This engine serial is distinct from the machine's chassis PIN plate, which is located on the right-hand side of the cab on the lower frame for excavators or on the front frame casting for dozers and wheel loaders.

PrefixIdentifies
4D95L-1CC4D95L-1CC

Frequently asked questions

What is the engine model for the Komatsu 4D95L-1CC (S/N 49965-UP)?

The engine is the Komatsu 4D95L-1CC, a 4-cylinder, liquid-cooled, turbocharged diesel engine from the 95 Series family.

What is the operating weight of the machines using this engine?

The operating weight varies by configuration and series, typically ranging from 6 to 10 tons for the PC60 and PC70 excavator series.

What engine replaced the 4D95L-1CC?

The 4D95L-1CC was replaced by the 4D95LE-3 series engine in later generations of the PC60 and PC70 excavators.

What 4D95L-1CC(S/N 49965-UP) owners discuss

What is the powertrain and hydraulic behavior consensus for the Komatsu 4D95L-1CC engine?
The 4D95L-1CC is a mechanical injection engine without an ECU. It uses a rotary injector pump with individual lines to each injector. Operators report that the engine can lose power under heavy digging loads if air filters, fuel filters, or charge-air hoses are restricted. Hydraulic weakness that occurs only when the oil is hot typically indicates internal leakage in the pump, main control valve, or cylinders rather than a pump failure alone. Cold oil viscosity masks these leaks; performance drops as viscosity decreases at operating temperature. All hydraulic functions slowing simultaneously points to shared causes like low oil level, degraded oil, or engine speed issues, not individual cylinder failure. The engine is mechanically governed and does not use common rail injection. Variations in power output and hydraulic flow exist depending on the specific machine configuration (excavator vs. loader) and serial range, but the core mechanical architecture remains consistent across the 4D95L series for this serial block. (varies by configuration/series)
What are the typical undercarriage and wear patterns for machines powered by this engine series?
Machines equipped with the 4D95L series, such as the PC60-5 and PC75UU-1, are compact excavators subject to high undercarriage wear in dusty or abrasive environments. Common wear patterns include track chain elongation, roller and idler failure, and track tensioner issues. The undercarriage is prone to rapid wear if track tension is not maintained correctly or if mud and debris pack into the rollers. Operators note that the machine's compact size and frequent directional changes in tight spaces accelerate track and roller wear. Regular inspection of track tension, roller condition, and chain links is critical. The engine itself does not have cylinder liners (sleeves) in the 95 series block; it uses a sleeveless design, which affects rebuild procedures and wear monitoring. (varies by configuration/series)
What are the known engine quirks and maintenance requirements for the 4D95L-1CC series?
The 4D95L-1CC is a turbocharged, mechanically injected engine. A key quirk is the identification of the engine: it is often labeled with Cummins branding (e.g., 'Cummins B3.3T') on the valve cover, but it is a Komatsu product. This can cause confusion when sourcing parts. The engine requires specific Komatsu fluids: Komatsu EO or equivalent for engine oil, Komatsu TO or equivalent for hydraulic oil, and Komatsu Super Coolant AF-NAC. The rotary injector pump requires precise timing adjustment using top dead center (TDC) on cylinder one and aligning timing marks on the pump and engine housing. Timing drift in the pump can cause rough performance and uneven fuel delivery. The engine does not have cylinder liners, so sleeve removal is not part of the standard rebuild process. Overhaul kits for this serial range (49965-Up) are specific to the 4D95L-1AA/1BB/1CC configuration. (varies by configuration/series)
What are the common electrical and sensor issues reported for this machine type?
While the 4D95L-1CC engine itself is mechanically controlled, the machine it powers relies on electronic systems for monitoring and safety. Common issues include intermittent starting, dashboard failures, and random shutdowns caused by faulty sensors or unstable power supplies. Operators report multiple fault codes related to the engine controller power failure (E10), engine control failure (E11), and sensor malfunctions (E15). Grounding issues are a frequent culprit for erratic behavior. The engine management system can trigger derating or shutdowns if it detects abnormal conditions. Checking battery state of charge, engine and chassis grounds, and main starter cables is essential before diagnosing electrical faults. Fault codes should be decoded using official Komatsu resources to identify specific sensor or circuit issues. (varies by configuration/series)
What should be checked when buying a used machine with a 4D95L-1CC engine (S/N 49965-UP)?
When purchasing a used machine with a 4D95L-1CC engine (S/N 49965-UP), verify the engine serial number to confirm it falls within the 49965-Up range, as parts and specifications differ from earlier or later variants. Check for signs of hydraulic weakness when hot, which indicates internal leakage. Inspect the undercarriage for excessive wear, track tension, and roller condition. Test the engine for proper timing and fuel delivery, as rotary pump timing drift is a known issue. Look for signs of coolant contamination, such as exhaust in the cooling system, which can indicate head gasket failure or cracked components. Verify the condition of the air intake system, including charge-air hoses and clamps, as restrictions can cause power loss. Check for fault codes and ensure the dashboard and sensors are functioning correctly. Confirm the use of correct Komatsu fluids (EO, TO, Super Coolant AF-NAC). Have your dealer verify the engine serial number and parts compatibility before purchase. (varies by configuration/series)
How does the 4D95L-1CC engine's mechanical injection system affect troubleshooting compared to modern engines?
The 4D95L-1CC uses a mechanical rotary injector pump with individual lines to each injector, lacking an ECU or common rail system. This means troubleshooting focuses on mechanical adjustments and physical components rather than electronic diagnostics. Key areas include injector pump timing, fuel filter condition, air intake restrictions, and fuel quality. The absence of an ECU means no digital fault codes from the engine itself, but machine-level codes may still appear for hydraulic or electrical issues. Timing the pump requires aligning TDC on cylinder one and matching pump timing marks. Fuel delivery issues often manifest as rough performance or power loss under load. Mechanical wear in the pump or injectors can cause uneven fuel delivery. This system is robust but requires precise mechanical adjustment for optimal performance. (varies by configuration/series)
What are the critical safety considerations for the 4D95L-1CC engine and its machine?
Safety-critical issues include the potential for engine shutdown due to overheating or low oil pressure, which can cause sudden loss of hydraulic power. The swing brake must be inspected to ensure the upper structure holds position. Track tension must be maintained to prevent derailment. Electrical grounding issues can lead to unpredictable machine behavior. Always verify engine serial number and parts compatibility with your dealer. Use correct Komatsu fluids to prevent component failure. Inspect cooling system for blockages to prevent overheating. Check hydraulic hoses and fittings for leaks. Ensure all safety interlocks and sensors are functioning. Have your dealer verify critical safety components and serial number specifications. (varies by configuration/series)

Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.

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