Komatsu 1D75-1B(S/N 00100-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu 1D75-1B is a diesel engine series primarily fitted to Komatsu PC75-1 and PW75-1 midi excavators. These machines belong to the compact-to-mid-size crawler excavator class, with operating weights typically ranging from 7,400 kg (16,314 lb) to 8,165 kg (18,000 lb) depending on the configuration. Production years for the PC75-1 series generally span the late 1990s through the mid-2000s. The 1D75-1B engine succeeded earlier 1D75-1A variants in specific serial ranges (00100-UP) and was later replaced by the 6D105-1 engine family in subsequent generations like the PC75-2. Configurations offered included standard cab, ROPS/FOPS structures, and various emission package options depending on the regional market.
Across the 1D75 series generations, changes focused on emissions compliance, fuel injection precision, and durability enhancements. The 1D75-1B represented a specific engineering update within the 1D75 family, often distinguished by serial number breaks and minor internal component revisions compared to the 1A variant. This machine matters in the used and parts market today because the PC75/PW75 platforms remain ubiquitous in municipal and utility work. As these machines age, the demand for reliable 1D75-1B engine components, such as cylinder heads, pistons, and fuel system parts, remains high. The engine's design allows for straightforward overhaul and rebuild procedures, making it a cost-effective powerplant for fleet managers maintaining older Komatsu excavator inventory.
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 1D75-1B(S/N 00100-UP) specifications
Engine
| Model | 1D75-1B |
| Net Power | 149 kW (200 HP) @ 1950 rpm |
| Displacement | Not documented for this exact serial range — verify with your dealer |
| Cylinders | 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 1D75-1B(S/N 00100-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 1D75-1B(S/N 00100-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize Komatsu KOWA fluid analysis at every 500-hour interval to monitor engine wear metals (iron, copper, lead) and contaminants. Check coolant SCA concentration at 500 hours to prevent cavitation in the 1D75-1B cylinder liners. Monitor hydraulic oil particle count and viscosity to protect the high-pressure pump. Use KOMTRAX telematics to track load frequency and fuel burn rates, identifying abnormal consumption patterns early. Regularly inspect the air filter restriction indicator to ensure the intake system remains clear of debris, protecting the turbocharger and engine internals.
Corrective & Common Repairs
Address common 1D75-1B issues by inspecting the fuel injection pump for leaks and checking injector nozzle spray patterns. Replace worn piston rings if compression drops or excessive blow-by occurs. Inspect the turbocharger shaft play and seal condition for boost loss or oil consumption. Check the water pump impeller for erosion if coolant flow is reduced. Examine the oil cooler cores for blockage causing overheating. Replace worn camshaft bearings if oil pressure drops below specification. Inspect the crankshaft main bearings for wear if knocking noises are present.
Overhaul & Rebuild Points
Plan a major engine overhaul when cylinder bore wear exceeds limits or piston ring land damage is evident. Rebuild the fuel injection pump if delivery pressure drops or leakage is excessive. Replace the turbocharger if shaft clearance is out of spec or compressor blades are damaged. Inspect the cylinder head for warpage or cracked valves. Check the crankshaft for journal wear or cracks. Replace all gaskets and seals during overhaul. Ensure proper torque sequence for cylinder head bolts. Verify valve clearance adjustments after reassembly.
Seasonal & Environment Servicing
In cold climates, use low-viscosity engine oil and ensure the cooling system has adequate freeze protection. Check the battery charge status frequently in cold weather. In hot environments, clean radiator and oil cooler fins daily to prevent overheating. Inspect coolant hoses for softening or cracking due to heat. Use high-temperature grease for lubrication points in dusty conditions. Check the air intake system for moisture ingress in humid environments. Monitor fuel quality for water contamination, especially in tropical climates.
1D75-1B(S/N 00100-UP) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| YM114350-55120 | Fuel Filter Ass'Y | Fuel system service | Check fitment → |
| YM114250-35070 | Filter,Oil | Lubrication service | Check fitment → |
| YM114250-12580 | Element | Scheduled service item | Check fitment → |
| YM114250-55100 | Filter | Scheduled service item | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
1D75-1B(S/N 00100-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 |
| CA441 | Battery voltage too low | Weak battery or charging system failure | Replace the battery or alternator and check the voltage regulator |
| CA442 | Battery voltage too high | Faulty voltage regulator or alternator overcharging | Replace the alternator or battery and check the voltage regulator |
| CA122 | Intake air pressure sensor feedback voltage too high | Sensor malfunction or wiring short | Verify the intake pressure sensor and wiring |
| CA123 | Intake air pressure sensor feedback voltage too low | Sensor short or airflow restriction | Check for a sensor short or an airflow restriction |
| CA153 | Intake air temperature sensor feedback voltage too high | Sensor malfunction | Replace or test the IAT sensor |
| CA154 | Intake air temperature sensor feedback voltage too low | Sensor malfunction | Replace or test the IAT sensor |
| CA451 | Common rail pressure sensor feedback value too high | Fuel rail sensor malfunction or actual overpressure | Diagnose the fuel rail pressure sensor or pump lines |
| CA452 | Common rail pressure sensor feedback value too low | Fuel rail sensor malfunction or low pressure | 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 |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
All 1D75-1B(S/N 00100-UP) assemblies by section
Every catalogued assembly group for the Komatsu 1D75-1B(S/N 00100-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Cooling System
Komatsu : 1d75-1b(S/N 00100-Up) : Cooling System : Flywheel And Cooling Fan Case(#20101-)
| YM***90 | Flywheel Ass'Y | 1 |
| YM***00 | Cushion | 5 |
| YM***01 | Case,Fan | 1 |
Cylinder Block
Komatsu : 1d75-1b(S/N 00100-Up) : Cylinder Block : Balancer Shaft(#20101-)
| YM***24 | Bearing,Ball | 2 |
| YM***10 | Balancer Ass'Y | 1 |
Komatsu : 1d75-1b(S/N 00100-Up) : Cylinder Block : Camshaft And Tappet(#20101-)
| YM***80 | Camshaft Ass'Y | 1 |
| YM***50 | Rod,Push | 2 |
| YM***00 | Tappet | 2 |
Komatsu : 1d75-1b(S/N 00100-Up) : Cylinder Block : Crankshaft(#20101-)
| YM***50 | Washer | 1 |
| YM***20 | Wrench | 1 |
| YM***21 | Nut | 1 |
Komatsu : 1d75-1b(S/N 00100-Up) : Cylinder Block : Cylinder Block(#20101-)
| YM***40 | Cap Ass'Y,Oil Gauge | 1 |
| YM***20 | Seal | 1 |
| YM***10 | Grommet | 1 |
Komatsu : 1d75-1b(S/N 00100-Up) : Cylinder Block : Front Cover
Komatsu : 1d75-1b(S/N 00100-Up) : Cylinder Block : Piston And Connecting Rod(#20101-)
Cylinder Head
Komatsu : 1d75-1b(S/N 00100-Up) : Cylinder Head : Air Cleaner
| YM***30 | Cover | 1 |
| YM***50 | Nut | 1 |
| YM***60 | Air Cleaner Ass'Y | 1 |
Komatsu : 1d75-1b(S/N 00100-Up) : Cylinder Head : Air Intake Manifold
| YM***00 | Spacer | 1 |
| YM***52 | Stud | 1 |
| YM***10 | Packing (Kit) | 2 |
Komatsu : 1d75-1b(S/N 00100-Up) : Cylinder Head : Cylinder Head
| YM***00 | Washer | 1 |
| YM***80 | O-Ring (Kit) | 1 |
| YM***52 | Stud | 2 |
Komatsu : 1d75-1b(S/N 00100-Up) : Cylinder Head : Cylinder Head Cover
| YM***91 | Decompression Ass'Y | 1 |
| YM***40 | Spring | 1 |
| YM***50 | Plug | 1 |
Komatsu : 1d75-1b(S/N 00100-Up) : Cylinder Head : Muffler
| YM***02 | Nut | 2 |
| YM***00 | Gasket (Kit) | 1 |
| YM***10 | Muffler | 1 |
Komatsu : 1d75-1b(S/N 00100-Up) : Cylinder Head : Rocker Arm
| YM***52 | Screw | 1 |
| YM***61 | Arm Ass'Y | 1 |
| YM***90 | Support Ass'Y,Rocker Arm | 1 |
Electrical System
Komatsu : 1d75-1b(S/N 00100-Up) : Electrical System : Dynamo And Mounting(#20101-)
| YM***90 | Dynamo Ass'Y | 1 |
| YM***42 | Screw | 3 |
| YM***30 | Stator | 1 |
Komatsu : 1d75-1b(S/N 00100-Up) : Electrical System : Starting Motor
| YM***67 | Bolt | 2 |
| YM***10 | Starting Motor Ass'Y | 1 |
| YM***13 | Brush (-) | 1 |
Komatsu : 1d75-1b(S/N 00100-Up) : Electrical System : Starting Motor And Mounting
| YM***02 | Screw | 2 |
| (Y***0) | Starting Motor Ass'Y,(See Fig.0661) | 1 |
Fuel System
Komatsu : 1d75-1b(S/N 00100-Up) : Fuel System : Fuel Filter
| YM***30 | Packing | 1 |
| YM***50 | O-Ring | 1 |
| YM***02 | Nut | 1 |
Komatsu : 1d75-1b(S/N 00100-Up) : Fuel System : Fuel Injection Pump
| YM***20 | Packing | 1 |
| YM***50 | Seat | 1 |
| YM***08 | Pin,Spring | 2 |
Komatsu : 1d75-1b(S/N 00100-Up) : Fuel System : Fuel Injection Pump And Piping
| YM***30 | Cover | 1 |
| YM***02 | Nut | 3 |
| YM***60 | Clip | 2 |
Komatsu : 1d75-1b(S/N 00100-Up) : Fuel System : Fuel Nozzle And Spill Pipe
| YM***20 | Spring | 1 |
| YM***00 | Plate | 1 |
| YM***00 | Tube | 1 |
Komatsu : 1d75-1b(S/N 00100-Up) : Fuel System : Fuel Tank
| YM***41 | Cap Ass'Y | 1 |
| YM***11 | Fuel Tank Ass'Y | 1 |
| YM***11 | Bracket | 1 |
Komatsu : 1d75-1b(S/N 00100-Up) : Fuel System : Governor Control(#20101-)
| YM***50 | Limiter | 1 |
| YM***52 | Spring,Return | 1 |
| YM***90 | Lead | 2 |
Lubricating Oil System
Komatsu : 1d75-1b(S/N 00100-Up) : Lubricating Oil System : Lubricating Oil Filter
| YM***24 | O-Ring (Kit) | 1 |
| YM***62 | Bolt Plated | 1 |
| YM***70 | Filter,Oil | 1 |
Komatsu : 1d75-1b(S/N 00100-Up) : Lubricating Oil System : Lubricating Oil Pump
| YM***70 | Cover | 1 |
| YM***70 | O-Ring (Kit) | 1 |
| YM***42 | Bolt | 3 |
Tool And Kit
Komatsu : 1d75-1b(S/N 00100-Up) : Tool And Kit : Gasket Kit
| YM***02 | Gasket Kit | 1 |
| YM***24 | O-Ring (Kit) | 1 |
| YM***80 | O-Ring (Kit) | 1 |
Komatsu : 1d75-1b(S/N 00100-Up) : Tool And Kit : Tool
| YM***01 | Guide,Oil Seal | 1 |
| YM***54 | Bolt | 3 |
| YM***02 | Nut | 8 |
1D75-1B(S/N 00100-UP) serial number reference
The engine serial plate is typically located on the left side of the engine block near the injection pump or on a metal data plate affixed to the engine. The prefix '1D75-1B' identifies the engine model, and the subsequent digits (00100-UP) indicate the sequential build number for this specific engine family.
| Prefix | Identifies | Notes |
|---|---|---|
| 1D75-1B | Engine | Komatsu 1D75-1B engine series. Serial range 00100-UP. Verify with dealer for specific configuration variants or emissions tier differences within this serial range. |
Frequently asked questions
What engine does the Komatsu 1D75-1B use?
The Komatsu 1D75-1B is a diesel engine model, typically found in Komatsu PC75-1 and PW75-1 excavators. It is a direct-injection, turbocharged diesel engine designed for compact to mid-size crawler excavators.
What is the operating weight of the Komatsu 1D75-1B machine?
The operating weight varies by configuration and attachment. For the Komatsu PC75-1 excavator, the operating weight typically ranges from 16,314 lb (7,400 kg) to 18,000 lb (8,165 kg) depending on the stick length, bucket size, and counterweight.
What replaced the Komatsu 1D75-1B engine?
The 1D75-1B engine was succeeded by the 6D105-1 engine family in later generations of Komatsu excavators, such as the PC75-2 series. The 6D105-1 offered improved power output and emissions compliance for subsequent production years.
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