Komatsu 4D88E-3GB(S/N 00101-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu 4D88E-3GB (S/N 00101-UP) is a compact crawler excavator engine powering the PC45R-8 series. This class of machine operates in the 4,870–4,990 kg weight range with a bucket capacity of 0.055–0.16 m³. Production years for the PC45R-8 series span the mid-2010s. The 4D88E-3GB engine is a 4-cylinder, 2.2-liter displacement unit with an 88 mm bore and 90 mm stroke. It is naturally aspirated and delivers 28.3 kW at 2,400 rpm. Configurations include standard X-frame stability and compact radius designs for tight spaces. The PC45R-8 succeeded earlier PC45 models and was followed by the PC45MR-3 series.
The 4D88E-3GB engine replaced earlier naturally aspirated variants in the 4D88E family, aligning with emissions standards while maintaining mechanical simplicity. The machine is relevant in the used and parts market because its compact size suits municipal and utility work, and its engine shares overhaul components with the Yanmar 4TNE88. This cross-compatibility drives aftermarket support. The serial range 00101-UP indicates a specific production batch requiring precise catalog matching. The engine's durability in tight spaces keeps it relevant for retrofit and replacement in the secondary market.
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 4D88E-3GB(S/N 00101-UP) specifications
Engine
| Model | Komatsu 4D88E-3GB |
| Series/Generation | 4D88E-3 series |
| Displacement | 2.2 L (134 in³) |
| Cylinders | 4 |
| Bore | 88 mm (3.46 in) |
| Stroke | 90 mm (3.54 in) |
| Aspiration | Naturally Aspirated |
| Emissions Tier | U.S. EPA Tier 4 Final / EU Stage V |
Weights
| Operating Weight | 4,870 - 4,990 kg (10,737 - 10,999 lb) |
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
| Engine Power | 28.3 kW @ 2,400 RPM (37.9 hp @ 2,400 RPM) |
| Travel Speeds | Not documented for this exact serial range — verify with your dealer |
| Dig Depth | 11.2 ft class (3.4 m class) |
| Bucket Capacity | 0.055 - 0.16 m³ (0.07 - 0.21 cu yd) |
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 4D88E-3GB(S/N 00101-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 4D88E-3GB(S/N 00101-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
Use KOWA fluid analysis at every 500-hour interval to monitor engine wear metals and hydraulic contamination. Check coolant SCA concentration at 500 hours to prevent scaling. Monitor DEF levels daily on Tier 4 variants. Track fuel dilution in engine oil during 250-hour changes. Analyze hydraulic oil particle count to predict pump wear. Use KOMTRAX telematics to track load frequency and fuel burn for early anomaly detection.
Corrective & Common Repairs
Address intermittent starting by checking the engine controller power supply and sensor wiring. Replace fuel filters if power loss occurs under load. Inspect the air filter restriction indicator for clogging that reduces torque. Check the turbocharger for shaft play during 1,000-hour services. Replace worn injector O-rings if black smoke appears. Verify battery terminals for corrosion causing dashboard failures.
Overhaul & Rebuild Points
Plan major overhaul at 10,000–15,000 hours based on compression and oil consumption. Use the 4D88E-3GB specific overhaul kit for piston rings and cylinder liners. Inspect the crankshaft main bearings for wear during teardown. Check the camshaft lobes for scoring. Replace all gaskets and seals during rebuild. Verify valve clearance and adjust if necessary. Ensure the timing gear alignment is correct during reassembly.
Seasonal & Environment Servicing
In cold climates, use low-temperature engine oil and check coolant freeze protection. Drain water from the fuel separator daily in humid conditions. Inspect rubber hoses and belts for cracking in extreme heat. Clean radiator and oil cooler fins regularly to prevent overheating. Check the air intake system for moisture accumulation. Grease all pivot points more frequently in dusty environments. Verify battery charge in cold weather.
4D88E-3GB(S/N 00101-UP) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| (YM129052-55620) | Fuel Filter Ass'Y,(See Fig.A4110-B0a6) | Fuel system service | Check fitment → |
| YM129100-55650 | Element,Fuel Filter | Fuel system service | Check fitment → |
| YM129052-55620 | Fuel Filter Ass'Y | Fuel system service | Check fitment → |
| YM102103-55520 | O-Ring,(For Fuel Filter) | Fuel system service | Check fitment → |
| YM119808-12520 | Element,Outer | Scheduled service item | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
4D88E-3GB(S/N 00101-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 failure, or voltage regulator issue | 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 |
| CA122 | Intake air pressure high voltage | Intake pressure sensor malfunction or wiring issue | 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 |
| CA153 | Intake air temperature sensor high error | Intake air temperature sensor malfunction | Replace or test the IAT sensor |
| CA154 | Intake air temperature sensor low error | Intake air temperature sensor malfunction | Replace 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.
4D88E-3GB(S/N 00101-UP) attachments & work tools
Mini Excavator Work Tools
The Komatsu 4D88E-3GB engine powers the PC40MR-2, PC45R-8, and PC50MR-2 mini excavator series, which utilize standard quick-attach couplers for bucket and breaker tool interchangeability. Typical bucket capacities for this class range from 0.055 to 0.18 m³, with operating weights between 3,090 and 4,990 kg. Hydraulic flow requirements for auxiliary tools vary by configuration and series, necessitating verification of the specific machine's hydraulic kit arrangement.
Skid Steer Loader Work Tools
The engine is installed in the SK714-5 and SK815-5 skid steer loaders, which employ a universal skid steer attachment interface for buckets, grapples, and brooms. These machines feature a compact X-frame structure for stability and are designed for tight-space operations in construction and mining environments. Factory guarding options and hydraulic kit arrangements for auxiliary tools depend on the specific model series and must be confirmed via the dealer parts manual.
Wheel Loader Work Tools
The WA50-6 wheel loader utilizes the 4D88E-3GB engine and supports standard loader bucket configurations with capacities appropriate for its class. The machine is engineered for open-pit mining and general construction tasks, requiring compatible hydraulic lines for any auxiliary work tools. Specific bucket sizes and hydraulic kit details vary by configuration and series.
Tracked Dumper Work Tools
The CD30R-1 and CR30R-1 tracked dumpers use the 4D88E-3GB engine and are equipped with fixed or detachable dump bodies for material transport. These units are designed for site development and do not typically utilize interchangeable work tools like excavators or loaders. Guarding and body configurations are specific to the dumper series and must be verified against the factory spec sheet.
All 4D88E-3GB(S/N 00101-UP) assemblies by section
Every catalogued assembly group for the Komatsu 4D88E-3GB(S/N 00101-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Engine
Komatsu : 4d88e-3gb(S/N 00101-Up) : Engine : Air Cleaner And Mounting (Double Element) (For North America)(#17626-)
| YM***90 | Gasket,(Not Shown) | 1 |
| YM***60 | Support | 1 |
| YM***60 | Silencer | 1 |
Komatsu : 4d88e-3gb(S/N 00101-Up) : Engine : Air Cleaner And Mounting (Single Element)(#17626-)
| YM***90 | Gasket,(Not Shown) | 1 |
| YM***60 | Support | 1 |
| YM***60 | Silencer | 1 |
Komatsu : 4d88e-3gb(S/N 00101-Up) : Engine : Air Intake Manifold And Connection(#12707-)
| YM***02 | Bolt Plated | 6 |
| YM***02 | Screw | 2 |
| YM***00 | Heater,Intake Air | 1 |
Komatsu : 4d88e-3gb(S/N 00101-Up) : Engine : Alternator (40a) (Inner Parts)(#17626-)
| YM***20 | Rear Bracket Ass'Y | 1 |
| YM***30 | Front Bracket Ass'Y | 1 |
| YM***00 | Rotor Ass'Y | 1 |
Komatsu : 4d88e-3gb(S/N 00101-Up) : Engine : Alternator And Mounting (40a)(#17626-)
| YM***02 | Nut | 1 |
| YM***02 | Screw | 1 |
| YM***01 | Bolt | 1 |
Komatsu : 4d88e-3gb(S/N 00101-Up) : Engine : Camshaft And Tappet(#00145-)
| YM***80 | Camshaft Ass'Y | 1 |
| YM***01 | Gear Ass'Y,Camshaft | 1 |
| YM***50 | Bearing, Thrust | 1 |
Komatsu : 4d88e-3gb(S/N 00101-Up) : Engine : Crankshaft(#17626-)
| YM***70 | Pulley | 1 |
| YM***00 | Gear,Crank | 1 |
| YM***80 | Parallel Pin | 1 |
Komatsu : 4d88e-3gb(S/N 00101-Up) : Engine : Cylinder Block Accsessory(#17626-)
| YM***02 | Screw | 1 |
| YM***50 | Oil Pressure Transmitter | 1 |
| YM***20 | Plug,Drain(Without Oil Cooler Type) | 1 |
Komatsu : 4d88e-3gb(S/N 00101-Up) : Engine : Cylinder Block(#00145-)
| YM***30 | Main Metal Ass'Y (Std) | 5 |
| YM***00 | Plug | 1 |
| YM***50 | Plug | 1 |
Komatsu : 4d88e-3gb(S/N 00101-Up) : Engine : Cylinder Head
| YM***80 | Retainer, Spring | 8 |
| YM***40 | Seal,Valve? Exhaust (Kit) | 4 |
| YM***10 | Valve,Exhaust | 4 |
Komatsu : 4d88e-3gb(S/N 00101-Up) : Engine : Cylinder Head Cover(#17626-)
| YM***20 | Cover, Breather | 1 |
| YM***70 | Clamp | 1 |
| YM***51 | Cap, Lub. Oil Supply | 1 |
Komatsu : 4d88e-3gb(S/N 00101-Up) : Engine : Drive Gear(#17626-)
| YM***01 | Idler Gear Ass'Y,Idler | 1 |
| YM***52 | Screw | 2 |
| YM***20 | Bush,Idle Gear (Repair Part) | 1 |
Komatsu : 4d88e-3gb(S/N 00101-Up) : Engine : Electrical Parts (Forwerded Individually Parts)(#17626-)
| YM***10 | Relay,Stop Solenoid | 1 |
| YM***00 | Relay, Safety | 1 |
| YM***20 | Time Switch | 1 |
Komatsu : 4d88e-3gb(S/N 00101-Up) : Engine : Exhaust Manifold(#17626-)
| YM***02 | Nut | 2 |
| YM***00 | Cover | 1 |
| YM***10 | Gasket (Kit) | 1 |
Komatsu : 4d88e-3gb(S/N 00101-Up) : Engine : Flywheel And Flywheel Housing(#17626-)
Komatsu : 4d88e-3gb(S/N 00101-Up) : Engine : Front Cover(#17626-)
| YM***02 | Bolt Plated | 2 |
| YM***51 | Cap, Lub. Oil Supply | 1 |
| YM***00 | Clip,Breather Hose | 1 |
Komatsu : 4d88e-3gb(S/N 00101-Up) : Engine : Front Hanger(#17626-)
| YM***00 | Hook,Front | 1 |
| YM***42 | Screw | 2 |
Komatsu : 4d88e-3gb(S/N 00101-Up) : Engine : Fuel Filter And Piping(#17626-)
| YM***70 | Union | 1 |
| YM***02 | Bolt Plated | 2 |
| YM***20 | Pipe | 1 |
Komatsu : 4d88e-3gb(S/N 00101-Up) : Engine : Fuel Filter(#17626-)
| YM***00 | O-Ring (Kit) | 1 |
| YM***70 | Lever | 1 |
| YM***80 | Cup, Strainer | 1 |
Komatsu : 4d88e-3gb(S/N 00101-Up) : Engine : Fuel Injection Pump (Governor) (1/2) (Inner Parts)(#17626-)
| YM***30 | Spacer,Lever Shaft | 1 |
| YM***40 | Nut,Cap | 1 |
| YM***50 | Bolt, Revol. Limit | 2 |
Komatsu : 4d88e-3gb(S/N 00101-Up) : Engine : Fuel Injection Pump (Governor) (2/2) (Inner Parts)(#17626-)
| YM***50 | Angleich Ass'Y | 1 |
| YM***00 | Washer,Spring | 1 |
| YM***40 | Link? L=30.5,L=30.5 (Mark 05) | 1 |
Komatsu : 4d88e-3gb(S/N 00101-Up) : Engine : Fuel Injection Pump (Pump) (1/2) (Inner Parts)(#17626-)
| YM***50 | Kit, Shim | 1 |
| YM***10 | Plate? Caution | 1 |
| YM***02 | Nut | 1 |
Komatsu : 4d88e-3gb(S/N 00101-Up) : Engine : Fuel Injection Pump (Pump) (2/2) (Inner Parts)(#17626-)
| YM***70 | Retainer, Spring | 4 |
| YM***00 | Rack,Control | 1 |
| YM***02 | Screw | 2 |
Komatsu : 4d88e-3gb(S/N 00101-Up) : Engine : Fuel Injection Pump And Piping(#17626-)
| YM***60 | O-Ring,Fuel Injection Pump | 1 |
| YM***31 | Pipe,No.1 | 1 |
| YM***60 | Nut | 3 |
Komatsu : 4d88e-3gb(S/N 00101-Up) : Engine : Fuel Nozzle And Spill Hose(#00145-)
| YM***00 | Nozzle, Assembly | 1 |
| YM***20 | Spring | 1 |
| YM***00 | Fuel Injection Nozzle, Assembly | 1 |
Komatsu : 4d88e-3gb(S/N 00101-Up) : Engine : Gasket Kit(#17626-)
| YM***60 | O-Ring,Fuel Injection Pump | 1 |
| YM***40 | Seal,Valve? Exhaust (Kit) | 4 |
| YM***30 | Gasket Kit | 1 |
Komatsu : 4d88e-3gb(S/N 00101-Up) : Engine : Lubricating Oil Pump(#17626-)
| YM***50 | Pipe,Oil | 1 |
| YM***91 | Tube,Oil Suction | 1 |
| YM***30 | Bolt, Assembly | 1 |
Komatsu : 4d88e-3gb(S/N 00101-Up) : Engine : Muffler And Mounting(#17626-)
| YM***01 | Gasket (Kit) | 1 |
| YM***70 | Muffler | 1 |
| YM***60 | Nut | 4 |
Komatsu : 4d88e-3gb(S/N 00101-Up) : Engine : Oil Filter(#17626-)
| YM***50 | Nut | 1 |
| YM***00 | Valve,Relief | 1 |
| YM***22 | Screw | 3 |
Komatsu : 4d88e-3gb(S/N 00101-Up) : Engine : Oil Pan(#00145-)
| YM***30 | Spacer | 1 |
| YM***52 | Screw | 2 |
| YM***52 | Screw | 24 |
Komatsu : 4d88e-3gb(S/N 00101-Up) : Engine : Piston And Connecting Rod(#00145-)
| YM***00 | Screw | 2 |
| YM***00 | Crank Pin Metal A. (Std) | 1 |
| YM***81 | Piston Ass'Y | 4 |
Komatsu : 4d88e-3gb(S/N 00101-Up) : Engine : Rear Hanger(#11310-)
| YM***00 | Hook,Front | 1 |
| YM***42 | Screw | 2 |
Komatsu : 4d88e-3gb(S/N 00101-Up) : Engine : Rocker Arm(#00145-)
| YM***02 | Nut,Rock | 3 |
| YM***02 | Screw | 7 |
| YM***80 | Spring | 4 |
Komatsu : 4d88e-3gb(S/N 00101-Up) : Engine : Starting Motor (Inner Parts)(#11310-)
| YM***50 | Pinion Ass'Y,Pinion | 1 |
| YM***20 | Housing,Center | 1 |
| YM***90 | Spring,Brush | 4 |
Komatsu : 4d88e-3gb(S/N 00101-Up) : Engine : Starting Motor And Mounting(#11310-)
Komatsu : 4d88e-3gb(S/N 00101-Up) : Engine : Tool(#17626-)
| YM***20 | Flex Horn (Option.) | 1 |
Komatsu : 4d88e-3gb(S/N 00101-Up) : Engine : Water Pump And Cooling Fan(#17626-)
| YM***40 | Joint | 1 |
| YM***22 | Screw | 2 |
| YM***11 | Gasket (Kit) | 1 |
Komatsu : 4d88e-3gb(S/N 00101-Up) : Engine : Water Separator(#17626-)
| YM***00 | Gasket | 2 |
| YM***00 | O-Ring (Kit) | 1 |
| YM***50 | Plug,Air | 2 |
Frequently asked questions
What engine does the Komatsu 4D88E-3GB (S/N 00101-UP) use?
It uses the Komatsu 4D88E-3GB engine, a 4-cylinder, 2.2-liter, naturally aspirated diesel producing 28.3 kW at 2,400 rpm.
What is the operating weight of the machine powered by this engine?
The operating weight ranges from 4,870 kg to 4,990 kg, depending on the configuration and attachments.
What replaced the PC45R-8 series?
The PC45R-8 series was succeeded by the PC45MR-3 series in Komatsu's compact excavator lineup.
Need a specific 4D88E-3GB(S/N 00101-UP) part?
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