Komatsu 3D72-2GA(S/N 07992-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu 3D72-2GA is a diesel engine powering the PC05-5, PC05-6, PC05-7, and PC07-1 crawler excavator series. These compact machines operate in the 5 to 7-ton class with operating weights ranging from approximately 5,000 to 7,500 kg (11,000 to 16,500 lb). Production spans the early 2000s through the mid-2010s, bridging the gap between the older PC05-3/PC07-1 predecessors and the later PC07-2/PC10-5 successors. Configurations offered include standard and long-reach booms, varying undercarriage widths, and regional emissions packages.
Across generations, the 3D72-2GA engine replaced earlier naturally aspirated or early turbo variants, introducing improved fuel efficiency and emissions compliance for its era. The machine remains significant in the used and parts market due to its widespread use in municipal and utility work. Its compact size allows access to confined spaces, while the 3D72 series engine is known for durability and ease of overhaul, keeping aftermarket support and core availability high.
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 3D72-2GA(S/N 07992-UP) specifications
Engine
| Model | 3D72-2GA |
| 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 3D72-2GA(S/N 07992-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 3D72-2GA(S/N 07992-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize KOWA fluid analysis at every 500-hour interval to monitor engine wear metals and hydraulic system contamination. Check coolant SCA levels at 500 hours to prevent liner cavitation in the 3D72-2GA block. Monitor hydraulic oil particle counts to protect the main pump and control valves. Track fuel dilution and soot levels in engine oil to determine optimal change intervals based on actual operating conditions rather than fixed hours alone.
Corrective & Common Repairs
Address fuel system issues by inspecting the injection pump and nozzles for leaks or clogging, common in high-hour 3D72-2GA engines. Replace worn turbocharger seals if blue smoke or loss of power occurs. Inspect the water pump and cooling fan for leaks or imbalance. Check the alternator and starter motor mounts for vibration damage. Replace hydraulic hoses showing cracks or abrasion to prevent system failure and contamination.
Overhaul & Rebuild Points
Plan engine overhaul when compression drops below specification or oil consumption exceeds limits. Replace cylinder liners, pistons, and rings as a set to restore compression in the 3D72-2GA. Inspect the crankshaft for wear and replace bearings if clearances are out of spec. Check the camshaft and rocker arms for wear. Rebuild the hydraulic pump and control valves if flow or pressure tests indicate internal leakage.
Seasonal & Environment Servicing
In cold weather, ensure coolant concentration prevents freezing and use low-viscosity engine oil for cold starts. In dusty environments, check the air filter restriction indicator more frequently and clean the radiator fins daily. In high-humidity areas, drain the fuel separator daily to prevent water contamination. Inspect the undercarriage for mud buildup that can cause track derailment or excessive wear on rollers and sprockets.
3D72-2GA(S/N 07992-UP) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| YM102103-55520 | O-Ring,(For Fuel Filter) | Fuel system service | Check fitment → |
| YM119632-55620 | Fuel Filter Ass'Y | 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 → |
| YM121465-12510 | Element,Air Cleaner | Air intake service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
3D72-2GA(S/N 07992-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 |
| CA111 | Internal engine controller fault | ECM internal abnormality | Replace or reprogram the ECM |
| 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 |
| CA234 | Engine overspeed | Throttle calibration error, engine load cycle issue, or operator misuse | Verify throttle calibration and engine load cycle |
| CA441 | Battery voltage too low | Alternator failure, battery issue, or voltage regulator fault | Replace the alternator or battery; check the voltage regulator |
| CA442 | Battery voltage too high | Alternator overcharging or voltage regulator failure | Replace the alternator or battery; check the voltage regulator |
| AA10NX | Air cleaner clogging | Dirty or blocked air filter element | Replace the air filter |
| B@BCNS | Engine coolant overheating | Radiator blockage, fan belt failure, or low coolant level | Check radiator fins, fan belt, and coolant level |
| B@HANS | Hydraulic oil overheating | Contaminated hydraulic oil, clogged filter, or cooler fan failure | Change hydraulic filter and oil; check cooler fan |
| AB00KE | Charging voltage too low | Alternator malfunction 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.
3D72-2GA(S/N 07992-UP) attachments & work tools
Standard Buckets
Typical capacities for this class range from 0.15 to 0.25 m³ (0.20 to 0.33 cu yd). The machine utilizes a standard pin-on coupler system compatible with common mini-excavator bucket widths.
Tilt Rotator Attachments
Compatible with hydraulic tilt rotators requiring a dual-flow auxiliary circuit. Factory configurations often include a quick-attach plate to facilitate rapid tool changes without hydraulic disconnection.
Hydraulic Breakers
Suitable for breakers up to 1.5 tons. Requires a high-flow hydraulic kit and a specific mounting bracket. The 3D72-2GA engine provides sufficient power for standard duty cycles in this size class.
Augers
Post-hole augers are available in diameters from 300 to 600 mm (12 to 24 in). These tools require a dedicated hydraulic motor kit and a mounting frame compatible with the standard quick-attach interface.
Forks and Grapples
Pallet forks and material grapples are offered for material handling tasks. These attachments typically use the standard pin-on mount and do not require auxiliary hydraulic lines for basic operation.
All 3D72-2GA(S/N 07992-UP) assemblies by section
Every catalogued assembly group for the Komatsu 3D72-2GA(S/N 07992-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Cooling System
Komatsu : 3d72-2ga(S/N 07992-Up) : Cooling System : Water Pump And Cooling Fan
| YM***20 | O-Ring | 1 |
| YM***02 | Bolt Plated | 2 |
| YM***04 | Water Pump Ass'Y | 1 |
Cylinder Block
Komatsu : 3d72-2ga(S/N 07992-Up) : Cylinder Block : Camshaft And Tappet
| YM***00 | Gear,Camshaft | 1 |
| YM***00 | Rod,Push | 6 |
| YM***50 | Retainer, Bearing | 1 |
Komatsu : 3d72-2ga(S/N 07992-Up) : Cylinder Block : Crankshaft
| YM***80 | Bolt | 1 |
| YM***41 | Washer | 1 |
| YM***20 | Wrench | 1 |
Komatsu : 3d72-2ga(S/N 07992-Up) : Cylinder Block : Cylinder Block
| YM***11 | Gauge,Level | 1 |
| YM***20 | Plug,Drain(Without Oil Cooler Type) | 1 |
| YM***00 | Main Metal Ass'Y (Std) | 4 |
Komatsu : 3d72-2ga(S/N 07992-Up) : Cylinder Block : Flywheel And Flywheel Housing
| YM***20 | Bolt Plated | 3 |
| YM***52 | Bolt | 6 |
| YM***90 | Flywheel Ass'Y | 1 |
Komatsu : 3d72-2ga(S/N 07992-Up) : Cylinder Block : Front Cover And Gear
| YM***22 | Retainer, Idle Gear | 1 |
| YM***51 | Cap, Lub. Oil Supply | 1 |
| YM***92 | Case,Gear | 1 |
Komatsu : 3d72-2ga(S/N 07992-Up) : Cylinder Block : Oil Pan
| YM***50 | O-Ring | 1 |
| YM***52 | Bolt Plated | 20 |
| YM***40 | O-Ring,Drain Plug | 1 |
Komatsu : 3d72-2ga(S/N 07992-Up) : Cylinder Block : Piston And Connecting Rod
| YM***10 | Crank Pin Metal A.,0.25mm (Us) | 1 |
| YM***00 | Connecting Rod, Assembly | 3 |
| YM***01 | Piston Ring Ass'Y | 1 |
Cylinder Head
Komatsu : 3d72-2ga(S/N 07992-Up) : Cylinder Head : Air Intake Manifold And Air Cleaner
| YM***10 | Cap | 1 |
| YM***51 | Pipe,Suction | 1 |
| YM***80 | Bolt,Wing | 1 |
Komatsu : 3d72-2ga(S/N 07992-Up) : Cylinder Head : Cylinder Head
| YM***80 | Retainer, Spring | 6 |
| YM***00 | Bolt,Head | 14 |
| YM***10 | Valve,Exhaust | 3 |
Komatsu : 3d72-2ga(S/N 07992-Up) : Cylinder Head : Cylinder Head Cover
| YM***00 | Pipe,Breather | 1 |
| YM***51 | Cap, Lub. Oil Supply | 1 |
| YM***31 | Gasket,Plate (Kit) | 1 |
Komatsu : 3d72-2ga(S/N 07992-Up) : Cylinder Head : Exhaust Manifold And Muffler
| YM***02 | Screw | 4 |
| YM***22 | Stud | 4 |
| YM***10 | Gasket,Exhaust Manifold (Kit) | 1 |
Komatsu : 3d72-2ga(S/N 07992-Up) : Cylinder Head : Rocker Arm
| YM***30 | Screw,Adjusting | 2 |
| YM***62 | Screw | 1 |
| YM***02 | Nut | 2 |
Electrical System
Komatsu : 3d72-2ga(S/N 07992-Up) : Electrical System : Alternator
| YM***00 | Stator Ass'Y | 1 |
| YM***10 | Bearing,Ball | 1 |
| YM***02 | Alternator A. (20a) | 1 |
Komatsu : 3d72-2ga(S/N 07992-Up) : Electrical System : Alternator And Mounting
| YM***02 | Screw | 1 |
| YM***62 | Bolt,(For Shipping) | 1 |
| YM***52 | Screw | 1 |
Komatsu : 3d72-2ga(S/N 07992-Up) : Electrical System : Forwarded Individually Parts (Electrical Parts)
| YM***21 | Indicator, Charging | 1 |
| YM***00 | Feed Pump Ass'Y | 1 |
| YM***11 | Limiter, Current | 1 |
Komatsu : 3d72-2ga(S/N 07992-Up) : Electrical System : Starting Motor
| YM***01 | Washer,Spring | 1 |
| YM***20 | Cover | 1 |
| YM***51 | Nut | 1 |
Komatsu : 3d72-2ga(S/N 07992-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 : 3d72-2ga(S/N 07992-Up) : Fuel System : Engine Stop Motor And Mounting
| YM***80 | Ring,Snap | 1 |
| YM***00 | Pin,Cotter | 1 |
| YM***20 | Spring | 1 |
Komatsu : 3d72-2ga(S/N 07992-Up) : Fuel System : Fuel Filter And Piping
| YM***40 | Lever | 1 |
| YM***00 | O-Ring (Kit) | 1 |
| YM***31 | Hose Ass'Y,Fuel | 1 |
Komatsu : 3d72-2ga(S/N 07992-Up) : Fuel System : Fuel Injection Pump
| YM***00 | Valve W/Seat, Deliv | 3 |
| YM***00 | Washer,Spring | 2 |
| YM***00 | Washer | 2 |
Komatsu : 3d72-2ga(S/N 07992-Up) : Fuel System : Fuel Injection Pump And Piping
| YM***20 | Retainer, Pipe | 1 |
| YM***21 | Pipe,Injection? No.2 | 1 |
| YM***50 | Shim Ass'Y | 1 |
Komatsu : 3d72-2ga(S/N 07992-Up) : Fuel System : Fuel Nozzle And Spill Pipe
| YM***40 | Spacer, Valve Stop | 3 |
| YM***20 | Wire,Glow Plug | 1 |
| YM***00 | Sleeve | 3 |
Komatsu : 3d72-2ga(S/N 07992-Up) : Fuel System : Governor
| YM***50 | Nut,Lock | 1 |
| YM***00 | Pin, Cotter | 1 |
| YM***00 | Retainer, Shaft | 1 |
Komatsu : 3d72-2ga(S/N 07992-Up) : Fuel System : Water Separator
| YM***00 | Gasket | 2 |
| YM***00 | O-Ring (Kit) | 1 |
| YM***50 | Plug,Air | 2 |
Lubricating Oil System
Komatsu : 3d72-2ga(S/N 07992-Up) : Lubricating Oil System : Lubricating Oil Filter
| YM***50 | Nut | 1 |
| YM***02 | Bolt Plated | 3 |
| YM***51 | Cartridge | 1 |
Komatsu : 3d72-2ga(S/N 07992-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 : 3d72-2ga(S/N 07992-Up) : Tool And Kit : Gasket Kit
| YM***11 | Gasket (Kit) | 1 |
| YM***40 | Gasket,Head (Kit) | 1 |
| YM***10 | Gasket,Exhaust Manifold (Kit) | 1 |
Komatsu : 3d72-2ga(S/N 07992-Up) : Tool And Kit : Tool
| YM***60 | Wrench,Fuel Filter? Water Separator | 1 |
| YM***50 | Screw Driver | 1 |
| YM***00 | Tool Ass'Y,(Pc38uu) | 1 |
Frequently asked questions
What engine does the Komatsu 3D72-2GA use?
The Komatsu 3D72-2GA is a diesel engine powering the PC05-5, PC05-6, PC05-7, and PC07-1 excavator series.
What is the operating weight of the Komatsu 3D72-2GA machine?
Operating weight varies by configuration and undercarriage setup, typically ranging from 5,000 to 7,500 kg (11,000 to 16,500 lb).
What replaced the Komatsu 3D72-2GA machine?
The PC07-2 and PC10-5 series excavators succeeded the PC05-5/PC07-1 line, featuring updated engines and emissions systems.
What 3D72-2GA(S/N 07992-UP) owners discuss
What engine powers the Komatsu 3D72-2GA(S/N 07992-UP) and what are its known quirks?
What are the typical hydraulic behaviors and common failure points for this machine type?
What undercarriage or wear patterns are typical for this machine type?
What are common electrical or sensor issues reported by owners?
What should be checked when buying a used Komatsu 3D72-2GA(S/N 07992-UP)?
What safety-critical fix is associated with the hydraulic system on this series?
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
Need a specific 3D72-2GA(S/N 07992-UP) part?
Search live OEM part data, check fitment, and cross-reference alternatives with Heavy Parts AI.