Komatsuengine(no series)

Komatsu 4D102E-1C(S/N 26200282-UP)

Maintenance schedule, common problems & OEM parts breakdown

Search live 4D102E-1C(S/N 26200282-UP) parts

The Komatsu 4D102E-1C engine is a compact, four-cylinder diesel powerplant manufactured by Komatsu since 2017. It features a 3.9-liter displacement with a 102mm bore and is designed for use in compact and mini excavators, as well as small wheel loaders and dozers. This engine series supports machines with operating weights ranging from approximately 9,182 lb to 20,000 lb, covering the mini and compact equipment classes. The 4D102E-1C is part of the broader 102 Series lineage, which includes variants like the 4D102E-1 and 6D102E-1, and serves as a modern iteration in Komatsu's compact machinery portfolio, succeeding older generation engines in similar weight classes.

Across the 102 Series generations, Komatsu has refined emissions compliance, fuel efficiency, and durability to meet evolving Tier 4 and Stage V regulations. The 4D102E-1C specifically integrates advanced fuel injection and aftertreatment systems to reduce particulate matter while maintaining high torque output in a small footprint. In the used and parts market, this engine is highly valued for its reliability in compact excavators and loaders, where space constraints and frequent maintenance access are critical. Its widespread use in the PC60, PC70, and similar compact models ensures a robust supply of aftermarket support and a strong resale value for machines equipped with this powertrain.

Below: full specifications, fluids & capacities, the factory service schedule, common service parts, verified fault codes, what owners discuss, attachment guidance, the complete assembly directory, and a serial-number reference. Complete parts lists with full OEM part numbers, exploded diagrams, quantities, and fitment data are available free in Heavy Parts AI.

Komatsu 4D102E-1C(S/N 26200282-UP) specifications

Engine

Model	4D102E-1C
Displacement	3.9 L (238 cu in)
Cylinders	4 in-line
Bore	102 mm (4.02 in)
Stroke	120 mm (4.72 in)
Gross Power	97–112 kW (130–150 hp) @ 2500 rpm
Gross Torque	280–300 N·m (207–221 lb·ft) @ 1500 rpm
Compression Ratio	16.5:1

Weights

Engine Weight

390 kg (860 lb)

Dimensions

Engine Length	790 mm (31 in)
Engine Width	711 mm (28 in)
Engine Height	894 mm (35 in)

Performance

Note	Machine travel speeds, lift/dig/dump capacities, gradeability, and operating weight are not documented for this specific engine serial range in the provided sources.

Service capacities (summary)

Note	Fluid capacities (fuel, hydraulic, engine oil, cooling) are not documented for this specific engine serial range in the provided sources.

Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.

Komatsu 4D102E-1C(S/N 26200282-UP) maintenance schedule

Service interval	Tasks
Every 10 h	Check engine oil level and condition. Check hydraulic fluid level via sight glass. Check coolant level and ensure cap is secure. Check fuel level and drain water from separator. Check DEF level on Tier 4 machines. Check air filter restriction indicator. Inspect track tension and shoe/pad condition. Inspect hydraulic hoses for cracks or leaks. Inspect pins, bushings, and attachment points. Clear debris from radiator and oil cooler fins. Check for fluid leaks under the machine. Verify ROPS/FOPS integrity and seat belt function. Test horn, backup alarm, and lights. Verify emergency shutoff accessibility. Start engine and confirm gauges and KOMTRAX display are normal. Test all controls for smooth response. Check service and parking brakes.
Every 250 h	Change engine oil and filter. Grease all points including boom, stick, bucket, and swing bearing. Check fluid levels. Check air filter element. Inspect belts and hoses. Perform visual walk-around inspection.
Every 500 h	Replace fuel filter. Replace hydraulic return filter. Perform battery service and load test. Test coolant SCA concentration. Collect KOWA oil sample. Perform detailed undercarriage inspection.
Every 1,000 h	Collect hydraulic oil sample. Change final drive oil on both sides. Inspect turbocharger. Take wear measurements on critical components. Check valve adjustment. Perform structural inspection of boom and stick.
Every 2,000 h	Change hydraulic system oil. Flush and replace coolant. Service transmission. Perform comprehensive component evaluation. Inspect KDPF (typically at 4,500 hours).

Servicing the 4D102E-1C(S/N 26200282-UP) beyond the schedule

Predictive Maintenance & Fluid Analysis

Utilize KOWA fluid analysis at every 500-hour interval to monitor engine wear metals, hydraulic contamination, and coolant condition. Track ISO cleanliness levels in hydraulic fluid to prevent pump and valve damage. Monitor DEF levels and KDPF status to ensure emissions compliance. Analyze engine oil for soot and fuel dilution to optimize change intervals. Use KOMTRAX telematics to track load frequency and fault codes for proactive scheduling.

Corrective & Common Repairs

Address hydraulic hose leaks and cracked fittings during daily inspections to prevent fluid loss and component damage. Replace fuel filters and drain water separators regularly to protect the high-pressure injection system. Inspect and replace worn belts and hoses to avoid sudden failure. Check and tighten electrical connections to prevent KOMTRAX and sensor faults. Replace air filter elements when the restriction indicator triggers to maintain engine performance.

Overhaul & Rebuild Points

Plan major engine overhaul around 10,000 hours or when wear measurements indicate excessive clearance in the turbocharger, injectors, or cylinder components. Replace final drive oil at 1,000-hour intervals to prevent gear wear. Inspect swing machinery oil and replace as needed to maintain swing bearing integrity. Evaluate undercarriage wear at 2,000-hour intervals to determine track and sprocket replacement needs. Monitor structural welds on the boom and stick for fatigue cracks.

Seasonal & Environment Servicing

Adjust coolant concentration and SCA levels before winter to prevent freezing and corrosion. Check battery health and charging system output in cold temperatures. Inspect rubber hoses and belts for hardening or cracking in extreme heat. Clear debris from radiator and oil cooler fins more frequently in dusty environments. Use appropriate grade engine oil for ambient temperature ranges to ensure proper lubrication during cold starts and high-load operation.

4D102E-1C(S/N 26200282-UP) common service parts

Part number	Part	Notes
6162-53-5430	Packing,Oil Filter And Piping	Lubrication service	Check fitment →
6162-53-5450	Packing,Oil Filter And Piping	Lubrication service	Check fitment →
6732-21-5530	Cartridge, Engine Oil Filter	Lubrication service	Check fitment →
600-181-6330	Element Ass'Y,(Double Element)(Not Shown)	Scheduled service item	Check fitment →
600-181-6340	Element Ass'Y,(Double Element)(Not Shown)	Scheduled service item	Check fitment →

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4D102E-1C(S/N 26200282-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 voltage at the pin connector
CA111	Internal engine controller fault	ECM hardware or software failure	Replace or reprogram the ECM
CA441	Battery voltage too low	Weak battery, poor connections, or alternator failure	Replace the alternator or battery; check the voltage regulator
CA442	Battery voltage too high	Faulty voltage regulator or alternator overcharging	Replace the alternator or battery; 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	Diagnose the fuel rail pressure sensor or pump lines
CA452	Common rail pressure sensor feedback value too low	Sensor failure or fuel supply issue	Diagnose the fuel rail pressure sensor or pump lines
CA234	Engine overspeed	Throttle calibration error, engine load cycle issue, or operator misuse	Verify throttle calibration, engine load cycle, or operator misuse
AA10NX	Air cleaner clogging	Dirty or blocked air filter element	Replace the air filter

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

4D102E-1C(S/N 26200282-UP) attachments & work tools

Excavator Buckets

Standard digging and grading buckets are the primary work tools for this engine class, typically ranging from 0.25 to 0.50 cubic meters (0.33 to 0.66 cubic yards) in capacity. These attachments utilize a standard pin-on coupler system compatible with the PC60-7 and PC70-7 series frames. Factory guarding options include wear plates and side cutters for heavy abrasion resistance.

Hydraulic Breakers

Hydraulic hammers are supported by the engine's auxiliary hydraulic circuit, requiring a specific flow and pressure kit to match the breaker's requirements. Typical breaker weights for this power class range from 800 to 1,500 kg (1,764 to 3,307 lbs). The mounting bracket is pinned directly to the boom, with hydraulic lines routed along the boom to the tool's quick-connect couplers.

Grapples and Clamps

Rotating grapples and sorting clamps are available for material handling, relying on the machine's auxiliary hydraulics for rotation and grip functions. Bucket capacities for these tools vary by configuration, generally between 0.30 and 0.60 cubic meters (0.39 to 0.79 cubic yards). These attachments require a hydraulic kit to divert flow to the grapple's cylinder and rotation motor.

Augers and Drilling Rigs

Rotary augers for post-hole drilling or soil sampling are mounted to the boom using a standard pin-on interface. Typical auger diameters for this class range from 300 to 600 mm (11.8 to 23.6 inches). These tools require a high-flow auxiliary hydraulic kit to drive the rotation motor, with hydraulic lines connected to the machine's auxiliary ports.

Tilt Rotters and Quick Couplers

Mechanical quick couplers allow for rapid attachment changes, while tilt rotors provide additional articulation for grading and fine grading work. These systems interface with the standard bucket pins and require auxiliary hydraulic lines for the tilt and rotation functions. Factory configurations may include reinforced boom pins to handle the dynamic loads of these specialized tools.

All 4D102E-1C(S/N 26200282-UP) assemblies by section

Every catalogued assembly group for the Komatsu 4D102E-1C(S/N 26200282-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Engine

Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Air Cleaner (Double Element Type)(#26202310-)

04***10	Ring,See Fig. K4010-65a0	1
60***30	Element Ass'Y,(Double Element)(Not Shown)	1
60***40	Element Ass'Y,(Double Element)(Not Shown)	1
60***11	Washer,Seal (K26)	2

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Air Cleaner (Single Element Type) (Forwerded Individually Parts)(#26202310-)

04***10	Ring,See Fig. K4010-65a0	1
60***40	Element Ass'Y,(Double Element)(Not Shown)	1
60***11	Washer,Seal (K26)	1
60***20	Nut,Wing	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Air Connector(#26202310-)

02***04	Plug	1
67***11	Connector	1
67***10	Plug, Pipe (1/2-14 Npt)	2
67***60	Bolt, Mounting (M8x1.25x25)	6

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Air Heater Wiring(#26202310-)

08***19	Cap, At Heater Relay Terminals	1
21***50	Wiring Harness	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Air Intake Heater

67***10	Gasket	1
67***11	Gasket,Air Intake Heater	1
67***10	Harness, Wiring	1
67***20	Heater, Engine	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Alternator (25a)

(6***0)

Alternator A. (25a),(See Fig.A601p-02a5)

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Alternator (25a) (Inner Parts)

60***10	Alternator A. (25a)	1
KD***57	Bearing,Ball? Front	1
KD***60	Pulley,Non Hardening	1
KD***40	Rear Bracket Ass'Y	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Alternator Support

01***30	Bolt,(For Trimming Dozer)	1
01***11	Nut (Welded)	1
01***23	Washer,(With Car Heater)	1
01***23	Plain Washer	2

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Alternator Wiring Support

01***35	Bolt, Cover	1
61***61	Spacer	1
62***40	Plate	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Belt Tensioner (For 25a Alternator)

67***11	Tensioner,Belt	1
67***60	Belt	1
67***20	Bolt (M10x1.50x70)	1
67***30	Tensioner, Belt	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Breather Hose

01***16	Bolt, Mount Solenoid Valve	2
01***30	Bolt, Mounting - Front Hand Rails	2
07***89	Clamp,(D31s)	2
61***20	Cap Assembly, Oil Fill Tube	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Camfollower Cover(#26200282-26230914)

07***20	Clamp, Spring Hose	1
07***58	Hose	1
07***60	Hose	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Camfollower Cover(#26230915-)

67***60

Plug, Expansion (Not Used With Side Oil Fill)

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Camshaft

01***30	Bolt	2
67***10	Cover	1
67***80	Gasket, Accessory Drive Cover	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Caution Plate (Japanese-English)

09***61	Plate? Instruction,(Japanese-English)	1
67***11	Plate? Name	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Cooling Fan(#26202310-26222713)

67***51	Gasket, Cylinder Head	1
67***51	Gasket, Cylinder Head	1
67***10	Guide, Valve Stem - Intake/Exhaust (Thin Wall)	8
67***10	Guide, Valve Stem (Thick Wall 60.5mm Long Int)	4

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Cooling Fan(#26222714-)

67***10	Bushing, Oversize (No. 1 Bore)	1
67***20	Bushing, Oversize (No. 2-5 Bore)	1
67***10	Sleeve, Salvage - Std Bore	4

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Crank Pulley(#26200282-26232220)

61***60	Boss	4
67***10	Pulley, Crankshaft	1
67***20	Bolt (M12x1.25x36)	4

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Crank Pulley(#26232221-)

67***40	Bolt	4
67***10	Rod, Push	8
67***11	Rod, Push	8
67***60	Washer, Plain (M19)	8

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Crankshaft

67***00	Piston Ring Ass'Y	4
67***10	Pin, Piston	4
67***20	Ring, Retaining	8
67***00	Rod, Engine Connecting	4

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Cylinder Block Blind Plug(#26200282-26220121)

67***10

Bolt, Mounting (M8-1.25 X 25)

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Cylinder Block(#26200282-26224124)

67***40	Pin, Timing	1
67***50	Ring, Retaining	1
67***60	Screw, Round Head (M5-0.80x17)	2
67***80	Housing, Timing Pin	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Cylinder Block(#26224125-)

67***40	Pin, Timing	1
67***50	Ring, Retaining	1
67***60	Screw, Round Head (M5-0.80x17)	2
67***80	Housing, Timing Pin	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Cylinder Head(#26200282-26237229)

67***10	Head Ass'Y	1
67***50	Gasket	1
67***70	Insert, Exhaust	4
67***80	Insert, Intake	4

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Cylinder Head(#26237230-)

67***11	Head Ass'Y	1
67***51	Gasket, Cylinder Head	1
67***70	Insert, Exhaust	4
67***80	Insert, Intake	4

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Drain Plug And Oil Gauge

Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Exhaust Connection

Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Exhaust Manifold

07***08	Plug,(Without Auto Priming System)	1
67***10	Manifold	1
67***30	Bolt, Mounting (M10x1.50x65)	8
67***10	Gasket, Exhaust Manifold	4

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Fan Drive Pulley

67***11	Gasket,Starter	1
67***20	Bolt, Mounting (M10x1.50x35)	2
67***10	Bolt (M10x1.50x35)	2

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Fan Pulley(#26200282-26219989)

67***00	Main Metal Ass'Y	4
67***00	Main Metal Ass'Y	4
67***00	Main Metal Ass'Y	4
67***00	Thrust Metal Ass'Y	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Fan Pulley(#26219990-26222778)

09***61	Plate? Instruction,(Japanese-English)	1
67***11	Plate? Name	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Fan Pulley(#26222779-)

67***00	Piston Ring Ass'Y	4
67***10	Ring,Top	1
67***20	Ring,Second	1
67***40	Ring,Oil	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Flywheel Housing(#26202310-)

Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Flywheel Housing(#26238746-)

Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Flywheel(#26200282-26214631)

67***20	Washer, Plain (M12)	8
67***30	Bolt (M12x1.25x32)	8
67***00	Flywheel Ass'Y	1
67***80	Gear,Ring	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Flywheel(#26214632-)

67***20	Crankshaft Ass'Y	1
67***50	Gear, Crankshaft	1
67***11	Gear, Crankshaft	1
67***10	Main Metal Ass'Y	4

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Front Cover(#26200282-26237229)

67***20	Bolt, Mounting (M8-1.25x16)	4
67***10	Cover, Push Rod	1
67***60	Gasket	1
67***61	Gasket, Push Rod Cover	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Front Cover(#26237230-)

67***20	Bolt, Mounting (M8-1.25x16)	4
67***10	Cover, Push Rod	1
67***61	Gasket, Push Rod Cover	1
67***80	Seal, Grommet	4

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Front Gear Train Cover

67***90	Cover, Mechanical Tach Drive	1
67***20	Seal, Rectangular Ring	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Fuel Filer Piping(#26200974-)

01***30	Screw	4
01***50	Bolt,(For Shipping)	4
60***20	Fan,Cooling	1
62***20	Spacer	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Fuel Filter

01***30	Bolt,(Water Separator Spec.)	3
01***75	Screw	1
67***30	Support Ass'Y	1
67***10	Hub, Fan	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Fuel Filter Joint(#26202310-)

67***50

Pulley, Accessory Drive

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Fuel Injection Pump (Feed Pump) (Inner Parts)

67***00	Nozzle Holder Ass'Y	4
67***60	Nozzle	1
67***50	Seal, Rectangular Ring	4
67***40	Retainer, Injector Nozzle	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Fuel Injection Pump (Governor) (1/2) (Inner Parts)

07***12	Gasket,Injection Pump Piping	2
67***40	Tube	1
67***10	Bolt, Banjo Connector (M12-1.50x24)	1
67***30	Screw, Banjo Connector (M12-1.50x24)	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Fuel Injection Pump (Governor) (2/2) (Inner Parts)

07***12	Gasket,Injection Pump Piping	3
61***90	Joint	1
63***60	Joint	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Fuel Injection Pump (Pump) (1/2) (Inner Parts)

DK***00	Shim? 2.00mm,(High Altitude Spec.)	0
DK***00	Gasket	1
DK***90	Governor Ass'Y	1
DK***40	Gasket	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Fuel Injection Pump (Pump) (2/2) (Inner Parts)

61***50	Connector, Banjo	1
61***50	Joint	1
67***40	Cap,(For Shipping)	2

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Fuel Injection Pump And Oil Piping

Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Fuel Injection Pump Mounting

67***10

Plug, Pipe (1/2-14 Npt)

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Fuel Inlet And Outlet Joint

67***10	Connector	1
67***20	Bolt (M10-1.50x75)	3
67***30	Seal,Water Inlet Connection	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Fuel Lift Pump(#26202310-)

(6***0)

Alternator A. (25a),(See Fig.A601p-02a5)

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Fuel Piping And Cylinder Block Blind Cover

67***40

Pulley

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Fuel Piping(#26200974-26229350)

01***55	Bolt, Mount Dryer To Bracket And Frame	4
01***30	Screw	4
60***20	Fan,Cooling	1
62***20	Spacer	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Fuel Piping(#26229351-)

67***10

Pulley,Air Conditioner

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Head Cover (With Oil Filler Cap)(#26200282-26220121)

67***30	Bolt (M8x1.25x25)	4
67***50	Washer, Plain (3/8 Inch)	4
67***80	Gasket, Valve Cover	4
67***81	Gasket, Valve Cover	4

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Head Cover (Without Oil Filler Cap)(#26200974-)

67***30	Bolt (M8x1.25x25)	4
67***50	Washer, Plain (3/8 Inch)	4
67***81	Gasket, Valve Cover	4
67***10	Gasket,Camfollower Cover Bolt	4

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Heater Switch (Forwerded Individually Parts)

60***70

Switch,Air Intake Heater

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Injection Nozzle

60***10	Alternator A. (25a)	1
KD***57	Bearing,Ball? Front	1
KD***60	Pulley,Non Hardening	1
KD***40	Rear Bracket Ass'Y	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Muffler (Side Exhaust Type)(#26202310-)

01***25	Bolt, Mount Engine Oil Drain To Fuel Tank	4
01***35	Bolt,R.H. (For Add. Air Compressor)	2
01***06	Nut	4
61***50	Gasket (K1)	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Muffler (Upper Exhaust Type)

01***25	Bolt, Mount Engine Oil Drain To Fuel Tank	4
01***35	Bolt,R.H. (For Add. Air Compressor)	2
01***06	Nut	4
62***50	Plate,Lock	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Oil Cooler Cover

67***40	Elbow	1
67***50	Elbow	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Oil Filler Cap(#26200282-26220121)

61***10

Cap, Oil Filler

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Oil Filler(#26220122-)

07***16	Gasket,(For Pc750-6) (See Fig.A2110)	1
62***80	Plug,Drain	1
67***80	Tube, Oil Gauge	1
67***80	Gauge	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Oil Filter And Piping(#26202310-26219989)

01***30	Bolt,(Water Separator Spec.)	2
01***25	Bolt, Mount Engine Oil Drain To Fuel Tank	2
01***20	Screw	2
01***30	Bolt,(Water Separator Spec.)	2

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Oil Filter And Piping(#26219990-)

67***10	Connection	1
67***20	O-Ring,Oil Pressure Plug	1
67***30	Gasket, Filter Head	1
67***31	Gasket, Filter Head	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Oil Level Sensor And Oil Gauge(#26209123-)

09***50	Liquid Gasket, Lg-7, 150g	0
67***40	Pan, Oil	1
67***60	Bolt, Mounting (M8-1.25x25)	2
67***10	Gasket (K2)	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Oil Pan And Suction Tube(#26202310-)

07***15	Plug	1
67***20	Bolt (M8-1.25x16)	2
67***30	Plate, Cover	1
67***50	Plug, O-Ring	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Oil Pan Bolt

07***16	Gasket,(For Pc750-6) (See Fig.A2110)	1
62***80	Plug,Drain	1
67***20	Guide	1
67***40	Gauge	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Oil Piping Elbow

07***12	Gasket,(Without Air Compressor Type) (K2)	2
07***10	Screw, Banjo Connector (M10-1.25x20)	1
61***40	Nipple	1
62***10	Seal, O-Ring (M10-1.00)	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Oil Pressure Switch(#26200282-26224157)

67***10	Cylinder Block Ass'Y	1
67***10	Plug, Pipe (1/2-14 Npt)	1
67***30	Plug, Pipe (1/8 Nptf)	2
67***90	Nozzle, Piston Cooling	4

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Oil Pressure Switch(#26224158-)

62***10	Screw	1
62***10	Seal, O-Ring (M10-1.00)	3
67***30	Block Assembly, Cylinder	1
67***20	Kit, Cylinder Block Hardware	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Oil Pump

01***30	Bolt,(Water Separator Spec.)	2
01***25	Bolt, Mount Engine Oil Drain To Fuel Tank	2
01***20	Screw	4
01***14	Bolt,(With Corrosion Resistor)	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Piston

67***10	Pulley, Crankshaft	1
67***20	Bolt (M12x1.25x36)	4

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Rear Hanger

04***08	Clip	1
08***14	Clip,(With After Cooler)	1
67***10	Hanger	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Repair Parts (1/4) (Cylinder Head)

67***51	Gasket, Cylinder Head	1
67***51	Gasket, Cylinder Head	1
67***10	Guide, Valve Stem - Intake/Exhaust (Thin Wall)	8
67***10	Guide, Valve Stem (Thick Wall 60.5mm Long Int)	4

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Repair Parts (2/4) (Cylinder Block)

67***10	Bushing, Oversize (No. 1 Bore)	1
67***20	Bushing, Oversize (No. 2-5 Bore)	1
67***10	Sleeve, Salvage - Std Bore	4

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Repair Parts (3/4) (Crankshaft)

67***00	Main Metal Ass'Y	4
67***00	Main Metal Ass'Y	4
67***00	Main Metal Ass'Y	4
67***00	Thrust Metal Ass'Y	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Repair Parts (4/4) (Piston)

67***00	Piston Ring Ass'Y	4
67***10	Ring,Top	1
67***20	Ring,Second	1
67***40	Ring,Oil	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Rocker Arm

67***12

Tappet, Valve

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Starting Motor (4.5kw)

(6***0)

Starting Motor Ass'Y,(4.5kw) (See Fig.A621p-02a0)

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Starting Motor (4.5kw) (Inner Parts)

60***10	Starting Motor Ass'Y	1
KD***10	Spring	1
KD***40	Pinion	1
KD***50	Washer	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Starting Motor Mounting

67***11	Gasket,Starter	1
67***20	Bolt, Mounting (M10x1.50x35)	2
67***10	Bolt (M10x1.50x35)	2

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Stop Solenoid

01***30	Bolt,(For Trimming Dozer)	1
01***11	Nut (Welded)	1
01***23	Washer,(With Car Heater)	1
01***23	Plain Washer	2

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Tachometer Drive Cover

67***50	Plate, Cylinder Block Stiffener	1
(0***0)	Liquid Gasket, Lg-7, 150g	0

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Tappet

67***10	Camshaft	1
67***20	Support, Camshaft Thrust	1
67***31	Gear, Camshaft	1
67***60	Bolt (M8x1.25x22)	2

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Thermostat

08***05	Switch,Engine Oil Pressure	1
62***10	Seal, O-Ring (M10-1.00)	1
67***30	Cartridge, Engine Oil Filter	1
67***70	Adaptor	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Thermostat Housing

67***30	Cartridge, Engine Oil Filter	1
67***40	Switch,Oil Pressure	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Under Plate

67***11	Pump, Lubricating Oil	1
67***20	Bolt (M8x1.25x30)	4

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Water Connector

(6***0)

Starting Motor Ass'Y,(4.5kw) (See Fig.A621p-02a0)

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Water Connector Plug

60***10	Starting Motor Ass'Y	1
KD***10	Spring	1
KD***40	Pinion	1
KD***50	Washer	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Water Pump

01***35	Bolt, Cover	1
61***61	Spacer	1
62***40	Plate	1

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Komatsu : 4d102e-1c(S/N 26200282-Up) : Engine : Water Valve And Water Temperature Sensor

20***30	Valve,Heat Water Inlet	1
67***10	Adapter	1
78***80	Sensor,Water Temperature	1

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4D102E-1C(S/N 26200282-UP) serial number reference

The PIN plate is located on the right-hand side of the cab on the lower frame, typically just behind the front idler or beneath the operator's window. Read the prefix from the model designation stamped on the plate, matching it to the serial number range listed in the catalog.

Prefix	Identifies	Notes
4D102E-1C	Standard	Serial range 26200282-UP. Primary model designation for this engine configuration.
4D102E-1C-1C	Variant	Serial range 26200163-UP. Listed as an 'Other catalog variant' in published references documentation. Verify with dealer if this specific prefix applies to the 26200282-UP range or if it is a distinct sub-range.
4D102E-1C-US	US Market	Serial range 26200282-UP. Listed as an 'Other catalog variant' in published references documentation. Factory spec sheet indicates this is a regional configuration variant for the same serial range.

Frequently asked questions

What engine does the Komatsu 4D102E-1C use?

The Komatsu 4D102E-1C is a 3.9-liter, four-cylinder diesel engine with a 102mm bore, part of the 102 Series designed for compact construction equipment.

What is the operating weight range for machines using this engine?

Machines equipped with the 4D102E-1C typically fall within the compact class, with operating weights ranging from approximately 9,182 lb to 20,000 lb, varying by configuration and attachment.

What replaced the Komatsu 4D102E-1C?

The 4D102E-1C is part of the ongoing 102 Series lineage; specific successor models depend on the machine application, with newer Tier 4 Final/Stage V compliant variants continuing to use updated versions of the 102 Series architecture.

What 4D102E-1C(S/N 26200282-UP) owners discuss

What are the power and torque specifications for the Komatsu 4D102E-1C engine?

The engine produces 97-112 kW (130-150 hp) at 2500 rpm and 280-300 Nm (207-221 lb.ft) of torque at 1500 rpm. The exact output varies by configuration/series depending on the specific machine application and emissions package.

What are the known hydraulic behaviors and common failure patterns for this machine type?

Operators report that hydraulic weakness often correlates with engine performance; if the engine drops RPM under load, the hydraulic system may be dragging the engine down rather than suffering internal pump failure. A common diagnostic pattern is hydraulics working well when cold but becoming weak when hot, indicating internal leakage in the pump, main control valve, or cylinders due to decreased oil viscosity. The main safety valve is a critical component for system smoothness and should be inspected if heating is slow or pressure is erratic.

What undercarriage and wear patterns are typical for Komatsu excavators of this era?

Undercarriage components such as bushings, bearings, and track pads are subject to significant wear. Worn bushings lead to noise and vibration, while worn bearings can cause premature track failure. Track tension must be monitored regularly, as repeated loosening often indicates adjuster or component wear. Operators note that the Komatsu line is designed to wear out complete machines simultaneously, meaning if a hydraulic pump fails, the engine may be near the end of its service life.

What are the specific engine quirks and maintenance requirements for the 4D102E-1C series?

The 4D102E-1C is a 4-cylinder in-line turbo engine with a 3.9-liter displacement, 102 mm bore, and 120 mm stroke. It features a 16.5:1 compression ratio. A known issue for engines in this age range is oil pressure switch leakage. The engine requires specific Komatsu Engineering Standard lubricants, including Komatsu EO diesel engine oil, Komatsu HO hydraulic oil, and Super-coolant AF-NAC. The cooling package is prone to clogging between the radiator, hydraulic oil cooler, and charge-air cooler, leading to overheating during heavy excavation.

What are the common electrical and sensor issues reported by owners?

Komatsu excavators rely heavily on electronic control systems, where a single faulty sensor or unstable power supply can trigger multiple warning signals. Common electrical complaints include intermittent starting, dashboard failures, and random machine shutdowns. Owners are advised to check battery state of charge, engine/chassis grounds, and main starter cables before diagnosing complex electronic faults.

What should be checked when buying a used machine with a 4D102E-1C engine?

Verify the engine serial number to confirm it falls within the 4D102E-1C range (Nos: 26200282 - the OEM part reference) to ensure correct bolt torque specifications. Check for black smoke from the exhaust, which indicates fuel system or airflow issues. Inspect the cooling system for leaks or blockage between heat exchangers. Test hydraulic performance both cold and hot to identify viscosity-related leakage. Verify the condition of the undercarriage and track tension, as these are high-wear items. Check for oil pressure switch leaks and ensure the battery and starter system hold voltage under load.

What are the critical bolt torque specifications for the 4D102E-1C engine?

For the 4D102E-1C engine (Serial Nos: 26200282 - the OEM part reference), the main bearing bolts require a three-step torque: Step 1 to 60 Nm, Step 2 to 90 Nm, and Step 3 to 178 Nm. Connecting rod bolts require Step 1 to 30 Nm, Step 2 to 60 Nm, and Step 3 tightened an additional 60 Nm. Cylinder head bolts require Step 1 to tighten all to 90 Nm, Step 2 to check all, Step 3 to tighten the six long bolts to 120 Nm, Step 4 to tighten all bolts an additional 90 degrees, and Step 5 to check all bolts at 136 Nm. Have your dealer verify these specifications against the factory service manual for your specific serial number.

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

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