Komatsu 1D75-1A(S/N 00100-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu 1D75-1A(S/N 00100-UP) is a factory engine model number covered by a Komatsu parts catalog under this specific serial break, not a documented complete machine. Public information stops at the parts-catalog level: no displacement, rated power, weight, or dimensional data for this exact model is published. Its numeric designation and small-bore naming pattern point to a compact industrial diesel engine class, likely intended as a component power unit for equipment such as generator sets, compressors, or compact industrial machinery rather than as a stand-alone product line. No host machine or chassis application has been confirmed for this engine in available documentation, and it should not be assumed to power any specific Komatsu machine model based on numbering alone. Configuration options, if any existed across the production run, are not documented publicly.
Beyond the base parts catalog and its serial break at 00100, no generational history, running changes, or market timeline is documented for the 1D75-1A. A sibling engine, the 1D75-1B(S/N 00100-UP), shares a similar catalog naming and serial structure but is not confirmed to be technically identical or interchangeable, and its parts should not be assumed to fit this model without dealer verification. In the used and parts market today, this engine mainly turns up as a parts-catalog line item for older Japan-market industrial equipment; sourcing decisions should rely on matching the exact serial number range in the OEM catalog rather than on assumed compatibility with better-documented Komatsu engine families.
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.
1D75-1A(S/N 00100-UP) fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with filter) | Not documented in publicly available sources for this exact serial range — verify with your Komatsu dealer or the factory OMM | Komatsu genuine diesel engine oil (Komatsu EO), viscosity grade per ambient temperature per Komatsu's standard climate chart |
| Cooling system | Not documented in publicly available sources for this exact serial range — verify with your Komatsu dealer or the factory OMM | Komatsu genuine antifreeze/coolant (Komatsu AF-NAC or equivalent supercoolant), mixed to local freeze-protection requirement |
| Fuel tank | Not documented in publicly available sources for this exact serial range — verify with your Komatsu dealer or the factory OMM | ASTM No. 2-D diesel fuel (or No. 1-D in cold climates) |
| Hydraulic system and tank | Not documented in publicly available sources for this exact serial range — verify with your Komatsu dealer or the factory OMM | Komatsu genuine hydraulic oil (Komatsu HO), viscosity grade per ambient temperature |
| Final drive / powertrain compartments (if equipped) | Not documented in publicly available sources for this exact serial range — verify with your Komatsu dealer or the factory OMM | Komatsu genuine gear oil (Komatsu TO), grade per Komatsu's standard climate chart |
| Grease points | Spec only — no fill quantity applicable | Komatsu genuine multipurpose grease (Komatsu G2-LI or equivalent lithium-based grease) |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Komatsu 1D75-1A(S/N 00100-UP) maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 50 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
Servicing the 1D75-1A(S/N 00100-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
No published oil or coolant capacities exist for this serial range, so track drain intervals by hours run and visible condition rather than by a factory chart. Send oil samples out at each scheduled change to watch for early wear metal trends, since no baseline data is published to compare against. Log compression and injector spray-pattern checks over time to catch drift on this mechanically-governed, pre-ECU engine before it becomes a failure.
Corrective & Common Repairs
As a mechanically-governed small industrial diesel, this engine has no electronic fault codes or diagnostic scan data; troubleshooting relies on mechanical symptoms such as smoke color, rough idle, and fuel delivery pressure. Common wear points on engines of this class are the fuel injection nozzles, the governor linkage, and the fan belt and water pump. Verify any replacement part against the exact 1D75-1A(S/N 00100-UP) catalog line before ordering, since the 1D75-1B sibling is not confirmed interchangeable.
Overhaul & Rebuild Points
No published overhaul specs (ring gaps, bearing clearances, torque values) exist for this exact serial range, so a rebuild should follow the Komatsu shop manual for this engine family and be checked against measured wear rather than assumed factory numbers. Inspect the cylinder head, valve seats, and injection pump closely, since this is a small-bore design where tolerances are tighter than on larger multi-cylinder industrial diesels. Confirm block and head part numbers against the S/N 00100-UP break before sourcing rebuild kits.
Seasonal & Environment Servicing
Cold-start performance on this mechanically-governed engine depends on battery condition, glow plug or intake-heater function if fitted, and fuel quality, since there is no electronic cold-start strategy to compensate. In hot or dusty industrial settings, air cleaner servicing and radiator fin cleaning matter more than on modern sealed engines given the age and simplicity of this platform. No factory seasonal fluid specs are published for this model, so match fluid grade to ambient temperature using general Komatsu EO oil and antifreeze guidance.
1D75-1A(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.
All 1D75-1A(S/N 00100-UP) assemblies by section
Every catalogued assembly group for the Komatsu 1D75-1A(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 : 1d75-1a(S/N 00100-Up) : Cooling System : Flywheel And Cooling Fan Case(#00100-20100)
| YM***00 | Cushion | 5 |
| YM***01 | Case,Fan | 1 |
| YM***90 | Flywheel Ass'Y | 1 |
Cylinder Block
Komatsu : 1d75-1a(S/N 00100-Up) : Cylinder Block : Balancer Shaft(#00100-20100)
| YM***24 | Bearing,Ball | 2 |
| YM***11 | Balancer Ass'Y | 1 |
Komatsu : 1d75-1a(S/N 00100-Up) : Cylinder Block : Camshaft And Tappet(#00100-20100)
| YM***50 | Rod,Push | 2 |
| YM***80 | Camshaft Ass'Y | 1 |
| YM***00 | Tappet | 2 |
Komatsu : 1d75-1a(S/N 00100-Up) : Cylinder Block : Crankshaft(#00100-20100)
| YM***50 | Washer | 1 |
| YM***20 | Wrench | 1 |
| YM***21 | Nut | 1 |
Komatsu : 1d75-1a(S/N 00100-Up) : Cylinder Block : Cylinder Block(#00100-20100)
Komatsu : 1d75-1a(S/N 00100-Up) : Cylinder Block : Front Cover
| YM***40 | Cap Ass'Y,Oil Gauge | 1 |
| YM***53 | Cover,Crank Case | 1 |
| YM***20 | Seal,Oil | 1 |
Komatsu : 1d75-1a(S/N 00100-Up) : Cylinder Block : Piston And Connecting Rod(#00100-20100)
| YM***10 | Crank Pin Metal A | 1 |
| YM***80 | Piston Ass'Y | 1 |
| YM***01 | Pin, Piston | 1 |
Cylinder Head
Komatsu : 1d75-1a(S/N 00100-Up) : Cylinder Head : Air Cleaner
| YM***30 | Cover | 1 |
| YM***50 | Nut | 1 |
| YM***60 | Air Cleaner Ass'Y | 1 |
Komatsu : 1d75-1a(S/N 00100-Up) : Cylinder Head : Air Intake Manifold
| YM***00 | Spacer | 1 |
| YM***52 | Stud | 1 |
| YM***10 | Packing (Kit) | 2 |
Komatsu : 1d75-1a(S/N 00100-Up) : Cylinder Head : Cylinder Head
| YM***00 | Washer | 1 |
| YM***80 | O-Ring (Kit) | 1 |
| YM***52 | Stud | 2 |
Komatsu : 1d75-1a(S/N 00100-Up) : Cylinder Head : Cylinder Head Cover
| YM***91 | Decompression Ass'Y | 1 |
| YM***40 | Spring | 1 |
| YM***50 | Plug | 1 |
Komatsu : 1d75-1a(S/N 00100-Up) : Cylinder Head : Muffler
| YM***02 | Nut | 2 |
| YM***00 | Gasket (Kit) | 1 |
| YM***10 | Muffler | 1 |
Komatsu : 1d75-1a(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 : 1d75-1a(S/N 00100-Up) : Electrical System : Dynamo And Mounting(#00100-20100)
| YM***90 | Dynamo Ass'Y | 1 |
| YM***42 | Screw | 3 |
| YM***30 | Stator | 1 |
Komatsu : 1d75-1a(S/N 00100-Up) : Electrical System : Starting Motor
| YM***67 | Bolt | 2 |
| YM***10 | Starting Motor Ass'Y | 1 |
| YM***13 | Brush (-) | 1 |
Komatsu : 1d75-1a(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 : 1d75-1a(S/N 00100-Up) : Fuel System : Fuel Filter
| YM***30 | Packing | 1 |
| YM***50 | O-Ring | 1 |
| YM***02 | Nut | 1 |
Komatsu : 1d75-1a(S/N 00100-Up) : Fuel System : Fuel Injection Pump
| YM***20 | Packing | 1 |
| YM***50 | Seat | 1 |
| YM***08 | Pin,Spring | 2 |
Komatsu : 1d75-1a(S/N 00100-Up) : Fuel System : Fuel Injection Pump And Piping
| YM***30 | Cover | 1 |
| YM***02 | Nut | 3 |
| YM***60 | Clip | 2 |
Komatsu : 1d75-1a(S/N 00100-Up) : Fuel System : Fuel Nozzle And Spill Pipe
| YM***20 | Spring | 1 |
| YM***00 | Plate | 1 |
| YM***00 | Tube | 1 |
Komatsu : 1d75-1a(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 : 1d75-1a(S/N 00100-Up) : Fuel System : Governor Control(#00100-20100)
| YM***00 | Governor Ass'Y | 1 |
| YM***11 | Spring,Regulator | 1 |
| YM***50 | Limiter | 1 |
Lubricating Oil System
Komatsu : 1d75-1a(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 : 1d75-1a(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 : 1d75-1a(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 : 1d75-1a(S/N 00100-Up) : Tool And Kit : Tool
| YM***01 | Guide,Oil Seal | 1 |
| YM***54 | Bolt | 3 |
| YM***02 | Nut | 8 |
1D75-1A(S/N 00100-UP) serial number reference
On this engine the ID plate is riveted to the engine block or gear case, stamped with the engine model (1D75-1A) and the serial number. Read it as model code first, then a straight ascending numeric serial (no multi-letter prefix block like Caterpillar PINs) - the number tells you where the unit falls in the 00100-UP production run covered by the parts book, not a separate plant or configuration code.
| Prefix | Identifies | Notes |
|---|---|---|
| 00100-UP | 1D75-1A engine parts-book serial break | Komatsu does not apply a multi-letter PIN prefix scheme to this engine the way Caterpillar does. The 1D75-1A parts catalog is keyed to a straight numeric serial break starting at 00100 and running up (S/N 00100-UP). No alpha prefix, plant code, or configuration-letter breakdown within this range is documented in public parts listings - confirm any sub-range or running changes with a Komatsu dealer. |
Frequently asked questions
What engine does the Komatsu 1D75-1A(S/N 00100-UP) use?
The 1D75-1A(S/N 00100-UP) is itself the engine model, not a machine that houses a separate engine. No published displacement, cylinder count, or power rating exists for this exact model; it is documented only at the parts-catalog level as a small-bore industrial diesel.
What is the operating weight of the Komatsu 1D75-1A(S/N 00100-UP)?
No operating weight is published for this engine model. Weight data of this kind is typically listed for the host machine it powers, and no confirmed host machine or chassis application has been documented for this engine.
What replaced the Komatsu 1D75-1A(S/N 00100-UP)?
No successor model is documented. There is no published Komatsu lineage naming a replacement for this engine; treat any claimed successor with caution and verify directly with a Komatsu dealer using the exact serial range.
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