Komatsu 3D72-2G(S/N 02519-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu 3D72-2G (S/N 02519-UP) is a diesel engine powering the PC07-2 mini excavator, a compact crawler class machine designed for utility and light construction work. Production years for this specific serial range are not documented in the available sources. The 3D72-2G belongs to the 3D72 series, which also includes variants like the 3D72-2F and 3D72-2GA. The PC07-2 is part of Komatsu's mini excavator lineage, succeeding earlier PC05 models and preceding later PC07 iterations. Configurations offered for the PC07-2 include standard and wide track shoe options, with operating weights varying by configuration.
Across the 3D72 series generations, Komatsu refined emissions compliance and fuel injection precision, with the 2G variant representing a specific production update within the PC07-2 line. The 3D72-2G remains relevant in the used and parts market because the PC07-2 is a high-volume entry-level excavator with widespread global deployment. Its simple mechanical architecture and commonality with other 3D72-series engines (like the 3D72-2B and 3D72-2H) ensure a robust aftermarket support network for overhaul kits, gaskets, and undercarriage components. The machine's compact size and durability make it a staple in rental fleets and municipal contracts, driving consistent demand for serviceable units and replacement 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 3D72-2G(S/N 02519-UP) specifications
Engine
| Model | 3D72-2G |
| Series | 72 Series |
| Cylinders | 3 |
| Displacement | 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 |
| Emissions Tier | 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 3D72-2G(S/N 02519-UP) maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
| Every 4,000 h |
|
Servicing the 3D72-2G(S/N 02519-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize Komatsu Oil Wear Analysis (KOWA) at every 500-hour interval to monitor engine oil wear metals (iron, copper, lead, aluminum) and contaminants (silicon for dirt, sodium for coolant). Check coolant pH, SCA concentration, and glycol content to prevent corrosion in the 3D72-2G cooling system. Monitor hydraulic fluid particle count (ISO cleanliness) and viscosity to protect the main pump and control valves. Track DEF levels for Tier 4 compliance. Early detection of coolant intrusion or fuel dilution in the 3D72-2G engine oil prevents catastrophic bearing failure.
Corrective & Common Repairs
Address frequent 3D72-2G issues by inspecting the fuel injection pump and piping for leaks, especially around the fuel nozzle and spill pipe. Replace the fuel filter and drain the water separator regularly to prevent injector clogging. Check the glow plug timer and safety relay for starting failures in cold weather. Inspect the alternator and starting motor mounts for vibration damage. Tighten the cylinder head bolts to spec if compression loss occurs. Replace worn hydraulic hoses at the 2,000-hour mark to prevent high-pressure leaks near the engine compartment.
Overhaul & Rebuild Points
The 3D72-2G engine overhaul typically begins around 10,000-15,000 hours, depending on duty cycle. Key rebuild components include cylinder liners, pistons, piston rings, and rod bushings. Replace main and rod bearings, thrust washers, and valve guides. Inspect the crankshaft for wear and the cylinder block for cracks. Use a complete overhaul gasket kit including the head gasket. For the PC07-2 undercarriage, replace track chains, sprockets, and idlers when wear limits are reached to maintain traction and reduce powertrain strain on the 3D72-2G engine.
Seasonal & Environment Servicing
In cold climates, ensure the 3D72-2G engine uses the correct viscosity diesel engine oil (e.g., SAE 5W-30 or 10W-30) and verify glow plug operation. Drain water from the fuel separator daily to prevent freezing. In dusty environments, clean the air cleaner outer element frequently and replace it when the restriction indicator triggers. Inspect the radiator and oil cooler fins for debris buildup to prevent overheating. In humid conditions, check for coolant contamination and monitor hydraulic oil for water ingress. Adjust track tension for muddy or rocky terrain to reduce undercarriage wear.
3D72-2G(S/N 02519-UP) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| YM119640-55600 | Fuel Filter Ass'Y | Fuel system service | Check fitment → |
| YM102103-55520 | O-Ring,(For Fuel Filter) | Fuel system service | Check fitment → |
| YM124550-55700 | Element,Fuel Filter | Fuel system service | Check fitment → |
| (YM171051-92760) | Wrench,Fuel Filter? Water Separator | Fuel system service | Check fitment → |
| YM121420-01760 | O-Ring,Oil Filter | Lubrication service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
3D72-2G(S/N 02519-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 failure | Replace or reprogram the ECM |
| CA441 | Battery voltage too low | Weak battery or charging system issue | Replace the alternator or battery; check the voltage regulator |
| CA442 | Battery voltage too high | Faulty voltage regulator or alternator | Replace the alternator or battery; check the voltage regulator |
| CA122 | Intake air pressure high voltage | Sensor malfunction or actual overpressure | 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 | Sensor failure or low fuel pressure | Diagnose the fuel rail pressure sensor or pump lines |
| AA10NX | Air cleaner clogging | Dirty or blocked air filter element | Replace the air filter |
| AB00KE | Charge voltage too low | Alternator failure or loose belt | Replace the alternator or tighten the belt |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
3D72-2G(S/N 02519-UP) attachments & work tools
Excavator Attachments
The Komatsu 3D72-2G engine powers the PC07-2 mini excavator, which utilizes standard hydraulic quick couplers for bucket and tool interchange. Typical bucket widths for this class range from 300 mm to 600 mm, with capacities varying by configuration/series based on material density and application.
Hydraulic System Configuration
The engine drives a main hydraulic pump assembly requiring specific flow rates for attachment operation. Hydraulic oil specifications include Komatsu HO or equivalent ISO VG46 hydraulic fluid to maintain pump integrity and attachment responsiveness.
Engine Mounting and Guarding
The 3D72-2G is mounted within the PC07-2 chassis using specific engine mounting brackets and vibration dampers. Factory configurations include the engine stop motor, governor control, and fuel filter assemblies located for service access, with guarding options for the cooling system and exhaust manifold.
All 3D72-2G(S/N 02519-UP) assemblies by section
Every catalogued assembly group for the Komatsu 3D72-2G(S/N 02519-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Cooling System
Komatsu : 3d72-2g(S/N 02519-Up) : Cooling System : Water Pump And Cooling Fan
| YM***20 | O-Ring | 1 |
| YM***02 | Bolt Plated | 2 |
| YM***40 | Packing | 1 |
Cylinder Block
Komatsu : 3d72-2g(S/N 02519-Up) : Cylinder Block : Camshaft And Tappet
| YM***00 | Gear,Camshaft | 1 |
| YM***00 | Rod,Push | 6 |
| YM***50 | Retainer, Bearing | 1 |
Komatsu : 3d72-2g(S/N 02519-Up) : Cylinder Block : Crankshaft
| YM***80 | Bolt | 1 |
| YM***41 | Washer | 1 |
| YM***20 | Wrench | 1 |
Komatsu : 3d72-2g(S/N 02519-Up) : Cylinder Block : Cylinder Block
| YM***20 | Plug,Drain(Without Oil Cooler Type) | 1 |
| YM***00 | Main Metal Ass'Y (Std) | 4 |
| YM***00 | Plug | 1 |
Komatsu : 3d72-2g(S/N 02519-Up) : Cylinder Block : Flywheel And Flywheel Housing(#03753-)
| YM***20 | Bolt Plated | 3 |
| YM***90 | Flywheel Ass'Y | 1 |
| YM***20 | Parallel Pin | 2 |
Komatsu : 3d72-2g(S/N 02519-Up) : Cylinder Block : Gear Case And Front Cover(#03753-)
| YM***22 | Retainer, Idle Gear | 1 |
| YM***51 | Cap, Lub. Oil Supply | 1 |
| YM***92 | Case,Gear | 1 |
Komatsu : 3d72-2g(S/N 02519-Up) : Cylinder Block : Oil Pan
| YM***52 | Bolt Plated | 20 |
| YM***40 | O-Ring,Drain Plug | 1 |
| YM***12 | Liquid Gasket | 1 |
Komatsu : 3d72-2g(S/N 02519-Up) : Cylinder Block : Piston And Connecting Rod
| YM***10 | Crank Pin Metal A.,0.25mm (Us) | 1 |
| YM***00 | Piston Ring Ass'Y | 1 |
| YM***00 | Connecting Rod, Assembly | 3 |
Cylinder Head
Komatsu : 3d72-2g(S/N 02519-Up) : Cylinder Head : Air Cleaner
| YM***10 | Cap | 1 |
| YM***11 | Air Cleaner Ass'Y | 1 |
| YM***00 | Valve | 1 |
Komatsu : 3d72-2g(S/N 02519-Up) : Cylinder Head : Air Intake Manifold And Glow Plug
| YM***20 | Wire,Glow Plug | 1 |
| YM***62 | Bolt Plated | 2 |
| YM***01 | Manifold,Air Intake | 1 |
Komatsu : 3d72-2g(S/N 02519-Up) : Cylinder Head : Cylinder Head
| YM***80 | Retainer, Spring | 6 |
| YM***00 | Bolt,Head | 14 |
| YM***10 | Insert | 3 |
Komatsu : 3d72-2g(S/N 02519-Up) : Cylinder Head : Cylinder Head Cover
| YM***00 | Pipe,Breather | 1 |
| YM***51 | Cap, Lub. Oil Supply | 1 |
| YM***30 | Gasket | 1 |
Komatsu : 3d72-2g(S/N 02519-Up) : Cylinder Head : Exhaust Manifold And Muffler(#03753-)
| YM***50 | Pipe | 1 |
| YM***62 | Bolt | 2 |
| YM***50 | Stay | 1 |
Komatsu : 3d72-2g(S/N 02519-Up) : Cylinder Head : Rocker Arm
| YM***30 | Screw,Adjusting | 2 |
| YM***62 | Screw | 1 |
| YM***02 | Nut | 2 |
Electrical System
Komatsu : 3d72-2g(S/N 02519-Up) : Electrical System : Alternator
| YM***01 | Alternator A. (20a) | 1 |
| YM***00 | Stator Ass'Y | 1 |
| YM***10 | Bearing,Ball | 1 |
Komatsu : 3d72-2g(S/N 02519-Up) : Electrical System : Alternator And Mounting
| YM***02 | Screw | 1 |
| YM***62 | Bolt,(For Shipping) | 1 |
| YM***52 | Screw | 1 |
Komatsu : 3d72-2g(S/N 02519-Up) : Electrical System : Safety Relay Glow Plug Timer(#03753-)
| (Y***0) | Feed Pump Ass'Y,Fuel | 1 |
| (Y***1) | Relay,Safety (Not Shown) | 2 |
| (Y***1) | Indicator, Charging | 1 |
Komatsu : 3d72-2g(S/N 02519-Up) : Electrical System : Starting Motor
| YM***01 | Washer,Spring | 1 |
| YM***20 | Cover | 1 |
| YM***51 | Nut | 1 |
Komatsu : 3d72-2g(S/N 02519-Up) : Electrical System : Starting Motor And Mounting
| YM***52 | Bolt Plated | 2 |
| (Y***1) | Starting Motor Ass'Y,(See Fig.A6210-B0a1) | 1 |
Fuel System
Komatsu : 3d72-2g(S/N 02519-Up) : Fuel System : Engine Stop Motor(#03753-)
| YM***80 | Ring,Snap | 1 |
| YM***00 | Pin,Cotter | 1 |
| YM***20 | Spring | 1 |
Komatsu : 3d72-2g(S/N 02519-Up) : Fuel System : Fuel Filter(#03753-)
| YM***00 | O-Ring (Kit) | 1 |
| YM***20 | Spring | 1 |
| YM***41 | Handle, Cock | 1 |
Komatsu : 3d72-2g(S/N 02519-Up) : Fuel System : Fuel Injection Pump
| YM***00 | Valve W/Seat, Deliv | 3 |
| YM***00 | Washer,Spring | 2 |
| YM***00 | Washer | 2 |
Komatsu : 3d72-2g(S/N 02519-Up) : Fuel System : Fuel Injection Pump And Piping(#03753-)
| YM***20 | Retainer, Pipe | 1 |
| YM***21 | Pipe,Injection? No.2 | 1 |
| YM***50 | Shim Ass'Y | 1 |
Komatsu : 3d72-2g(S/N 02519-Up) : Fuel System : Fuel Nozzle And Spill Pipe
| YM***40 | Spacer, Valve Stop | 1 |
| YM***00 | Sleeve | 1 |
| YM***80 | Nut | 1 |
Komatsu : 3d72-2g(S/N 02519-Up) : Fuel System : Governor Control(#03753-)
| YM***50 | Nut,Lock | 1 |
| YM***00 | Pin, Cotter | 1 |
| YM***00 | Retainer, Shaft | 1 |
Komatsu : 3d72-2g(S/N 02519-Up) : Fuel System : Water Separator(#03753-)
| YM***00 | Gasket | 2 |
| YM***00 | O-Ring (Kit) | 1 |
| YM***50 | Plug,Air | 2 |
Lubricating Oil System
Komatsu : 3d72-2g(S/N 02519-Up) : Lubricating Oil System : Lubricating Oil Filter
| YM***50 | Nut | 1 |
| YM***02 | Bolt Plated | 3 |
| YM***50 | Cartridge | 1 |
Komatsu : 3d72-2g(S/N 02519-Up) : Lubricating Oil System : Lubricating Oil Pump
| YM***50 | Oil Pressure Transmitter | 1 |
| YM***91 | Pipe,Oil Inlet | 1 |
| YM***20 | O-Ring,Cylinder Head Cover Bolt | 1 |
Tool And Kit
Komatsu : 3d72-2g(S/N 02519-Up) : Tool And Kit : Gasket Kit
| YM***40 | O-Ring,Drain Plug | 1 |
| YM***40 | Gasket,Head (Kit) | 1 |
| YM***10 | Gasket,Exhaust Manifold (Kit) | 1 |
Komatsu : 3d72-2g(S/N 02519-Up) : Tool And Kit : Tool
| (Y***0) | Wrench,Oil Filter | 1 |
| (Y***0) | Tool Ass'Y | 1 |
| (Y***0) | Driver,Screw | 1 |
3D72-2G(S/N 02519-UP) serial number reference
The PIN plate is riveted to 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 first three characters of the 17-character ISO PIN (positions 4–6) to identify the engine family and configuration variant.
| Prefix | Identifies | Notes |
|---|---|---|
| 3D72-2G | Engine Model | Komatsu 3D72-2G engine fitted to excavators in the S/N 02519-UP range. Factory spec sheet confirms this engine designation for the specified serial range. |
Frequently asked questions
What engine does the Komatsu 3D72-2G (S/N 02519-UP) use?
The Komatsu 3D72-2G is the engine model itself, a diesel engine powering the PC07-2 mini excavator. It is part of the 3D72 series, distinct from the 3D72-2F and 3D72-2GA variants.
What is the operating weight of the machine powered by this engine?
The operating weight varies by configuration/series. The PC07-2 mini excavator typically falls in the compact class, with weights generally under 20,000 lbs, but exact figures vary by track shoe width and attachment package.
What replaced the Komatsu 3D72-2G engine?
The 3D72-2G engine was succeeded by newer Komatsu engine generations (such as the SAA6D107E series in larger machines) and later iterations of the PC07 series excavators. Specific successor engine model for the PC07-2 is not documented in the available sources.
What 3D72-2G(S/N 02519-UP) owners discuss
What engine powers the Komatsu 3D72-2G(S/N 02519-UP) and what are its known quirks?
What are the typical hydraulic behaviors and common failure modes for this machine type?
What undercarriage and wear patterns are typical for this machine?
What are the common electrical and sensor issues reported by owners?
What should be checked when buying a used Komatsu 3D72-2G(S/N 02519-UP)?
What fluids and specifications are recommended for this engine and machine?
What safety-critical fixes require dealer verification?
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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