Komatsuhydraulic excavatorsmall ( - pc90)
Komatsu PC03-1(S/N 1001-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu PC03-1(S/N 1001-up) is an ultra-compact micro excavator built from roughly 1991 to 1996, sized for indoor demolition, landscaping, and confined-space digging where full-size machines can't fit. It runs a Komatsu 1D84-1A single-cylinder mechanical diesel engine rated around 5.5 kW (7.4 hp), with fully mechanical fuel injection and fully mechanical hydraulic controls and no electronic engine management of any kind. Operating weight sits around 0.75 metric tons (1,650 lb), among the lightest excavators Komatsu ever produced. It shipped in a single standard configuration: a rubber crawler undercarriage, fixed monoboom, and pin-on bucket, with no factory-documented couplers, hammers, or optional attachments. Komatsu paired the PC03-1's operation and maintenance manual with the smaller PC02-1A, a parallel micro-excavator sibling rather than a strict predecessor model.
Komatsu carried the PC03 concept forward through later production blocks recorded as PC03-2-EC and PC03-2-K (S/N 15001-up), each a modest step up in operating weight but built on the same micro-excavator idea. Treat these as related updates to the platform rather than a confirmed direct replacement for the 1001-up block, since no factory document ties them explicitly to this serial range. In today's used and parts market, the PC03-1 is a niche survivor: original production numbers were small, the machine is over three decades old, and its fully mechanical engine and hydraulics make it attractive to buyers who want a simple machine with nothing electronic to fail. That same age works against parts supply, since OEM stock is thin to nonexistent for many components, pushing owners toward salvage units, cross-compatible aftermarket parts, and engine rebuilds rather than new-part replacement.
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 PC03-1(S/N 1001-UP) specifications
Engine
| Engine model | Komatsu 1D84-1A (also listed as 1D84-1C in some parts references; same base 1D84 engine family) |
| Gross power | 5.5 kW (7.4 HP) at 2800 rpm |
| Displacement | 0.39 L (23.6 cu in) |
| Cylinders | Not documented for this exact serial range — verify with your dealer |
| Emissions tier | Pre-emissions era (1991-1996 production); no tier applicable |
Weights
| Operating weight | Approx. 0.75 t (750 kg / 1,653 lb) |
| Variant configs | No long-undercarriage or other weight variants documented for this serial range |
| Transport weight | Not documented for this exact serial range — verify with your dealer |
Dimensions
| Transport length | 0.81 m (32 in) |
| Track shoe / track width | 180 mm (7 in) |
| Transport width | Not separately documented beyond the track width figure above |
| Transport height, tail swing radius, ground clearance, undercarriage length | Not documented for this exact serial range — verify with your dealer |
Performance
| Max dig depth, max reach at ground, max dump height, max cutting height | Not documented for this exact serial range — verify with your dealer |
| Swing speed, travel speed, gradeability, drawbar pull | Not documented for this exact serial range — verify with your dealer |
| Bucket capacity | 0.02 m3 |
Forces
| Bucket digging force | Not documented for this exact serial range — verify with your dealer |
| Stick/arm digging force | Not documented for this exact serial range — verify with your dealer |
Service capacities (summary)
| Fuel tank, hydraulic system/tank, engine oil, 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.
PC03-1(S/N 1001-UP) fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with filter) | Not documented for this exact S/N 1001-UP block. This single-cylinder diesel's sump volume typically runs under 2 L for this engine class, but no confirmed figure exists for this machine — verify against the factory OMM or dealer parts book. | Komatsu genuine engine oil (EO series). Komatsu OMMs of this era spec SAE 10W or 10W-30 for cold climates and SAE 15W-40 or SAE 30 for warmer ambient ranges, selected off the machine's viscosity-by-temperature chart. Exact grade table for this serial range not confirmed. |
| Cooling system | Not documented for this serial range. The 1D84 single-cylinder engine family used by this machine is generally water-cooled with a small radiator, but no confirmed refill volume was found — verify with dealer/OMM. | Komatsu genuine antifreeze/coolant (ethylene-glycol base), mixed per the ambient-temperature ratio table in the OMM. No machine-specific concentration table confirmed. |
| Fuel tank | Not documented for this exact S/N block. Consistent with the machine's sub-1-tonne class, tank size is expected to be small, but no confirmed figure was found — verify with dealer/OMM. | Diesel fuel per Komatsu OMM fuel-quality specification (cetane number and sulfur content requirements per ambient temperature). |
| Hydraulic system total (incl. tank) | Not documented for this serial range. No confirmed liter figure for system total or tank-only volume was found — verify with dealer/OMM. | Komatsu genuine hydraulic oil (HO series) or equivalent anti-wear hydraulic fluid, ISO viscosity grade selected per ambient temperature per the OMM chart. Exact grade/viscosity table for this serial range not confirmed. |
| Final drive (each side) | Not documented for this serial range. No confirmed per-side refill figure found — verify with dealer/OMM. | Komatsu genuine gear oil (TO/AXO series) per the OMM's final-drive lubrication spec. |
| Swing drive | Not applicable / not confirmed. This class of sub-1-tonne mini excavator with a manual/mechanical slew arrangement may not carry a separate swing-drive oil reservoir; no dedicated swing-drive capacity was found for this model. | Not documented; if a swing reduction unit exists it would use Komatsu genuine gear oil per OMM, but no confirmed spec found for this machine. |
| Grease points | Not a fluid-volume item; lubricated per the grease-point interval schedule in the OMM. | Komatsu genuine multipurpose grease (Komatsu G2-LI lithium EP2 type or equivalent NLGI 2 grease). No machine-specific grease-point count confirmed. |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Komatsu PC03-1(S/N 1001-UP) maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 50 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
| Every 4,000 h |
|
Servicing the PC03-1(S/N 1001-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
The PC03-1's single-cylinder 1D84-1A engine and mechanical hydraulics give few electronic warning signs, so fluid condition is the main diagnostic tool. Track engine oil color and metal content between 250h drains to catch ring or bearing wear early. Watch hydraulic oil for milky discoloration (water ingress) or dark varnish (overheating), since the small hydraulic tank offers little buffer against contamination. Fuel filter sediment and injector spray-pattern checks at 500-1000h flag pump wear before hard starting or excess smoking develops.
Corrective & Common Repairs
Typical PC03-1 repairs center on the mechanical fuel system and crawler undercarriage rather than electronics; there's no ECM or fault codes to chase. Hard starting or white smoke usually traces to worn injector nozzles or injection pump wear on this aging single-cylinder engine. Rubber track wear, loose track tension, and worn idlers are common on machines this size and age. Hydraulic cylinder seal leaks at the boom and arm pivots are frequent, given the machine's decades of typical service life.
Overhaul & Rebuild Points
At major overhaul, expect to address the 1D84-1A's cylinder bore, piston, and injection pump wear, common failure points on a mechanical single-cylinder diesel with this much service life. Final drive gear sets and hydraulic pump or motor internals are the next wear group, since the machine's compact, low-capacity hydraulic circuit runs hot under sustained load. Rebuilding hydraulic cylinders (seals, rod wear) at the boom, arm, and bucket linkage is standard on high-hour units. No coupler or attachment mounts complicate rebuild scope, since this class only ran a fixed pin-on bucket.
Seasonal & Environment Servicing
Cold-weather starting is the main seasonal concern for the 1D84-1A's mechanical injection system; use the correct season-grade Komatsu EO engine oil and maintain the genuine antifreeze mixture ratio for the climate. Because the machine has no glow-plug or ECM-assisted cold-start electronics, batteries and starter connections need extra attention before winter use. In wet or muddy conditions, flush and re-grease all pivot pins more often than the standard interval, and inspect rubber tracks for packed debris that accelerates wear on this ultra-compact undercarriage.
PC03-1(S/N 1001-UP) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| YM114654-55600 | Fuel Filter Ass'Y | Fuel system service | Check fitment → |
| YM171051-92760 | Wrench,Fuel Filter? Water Separator | Fuel system service | Check fitment → |
| YM114654-55710 | Filter,Fuel | Fuel system service | Check fitment → |
| YM114250-35060 | Filter,Oil | Lubrication service | Check fitment → |
| YM114650-12590 | Element Ass'Y | Scheduled service item | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
PC03-1(S/N 1001-UP) attachments & work tools
Buckets
PC03-1 is a micro-class excavator (about 0.75t operating weight, roughly 0.02 m3 / 20L max bucket capacity), so bucket sizing sits well below standard mini-excavator GD/HD tiering. Pin-on digging buckets in the roughly 150-300mm (6-12in) range are the practical fit for this weight class; wider options are listed by some suppliers but pin and mount compatibility for those larger widths is not confirmed for this exact serial range, so treat anything above about 300mm as unverified. No rock-bucket or HD-duty bucket line is documented for this model — it predates that kind of tiered bucket naming.
Hydraulic hammers
No hydraulic breaker/hammer model or size class is confirmed as factory- or dealer-matched to the PC03-1 specifically. At roughly 0.75t operating weight this machine sits below the carrier-weight floor most hydraulic hammer lines are built for, since breakers need sustained flow and pressure this class of micro excavator is not built to deliver. Treat hammer fitment on this machine as unverified — confirm circuit flow/pressure with a dealer before mounting any breaker.
Quick couplers
No quick coupler model or type is documented as fitted or offered for the PC03-1. Machines in this micro-excavator class typically stay pin-on only; nothing ties a coupler system to this specific model.
Thumbs/grapples
No thumb kit or grapple attachment is documented for the PC03-1. Nothing in available records ties an excavator thumb or grapple product line to this model.
Rippers
No ripper or ripper-tooth attachment is documented for the PC03-1. This micro-class machine has no confirmed ripper option.
Hydraulic-kit notes
No auxiliary/high-flow hydraulic circuit, medium-pressure kit, or third-line option is documented for the PC03-1. Confirmed hydraulic use on this machine is limited to the standard boom/arm/bucket/travel/swing circuits; any attachment requiring an auxiliary circuit (hammer, grapple, etc.) should be treated as unconfirmed for this serial range until verified with a dealer or shop manual.
All PC03-1(S/N 1001-UP) assemblies by section
Every catalogued assembly group for the Komatsu PC03-1(S/N 1001-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
1d84-1a Engine S/N 00101-Up
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1a Engine S/N 00101-Up : Air Cleaner And Mounting
| YM***50 | Sponge | 1 |
| YM***50 | Nut | 1 |
| YM***60 | Washer,Seal | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1a Engine S/N 00101-Up : Air Intake Manifold And Connection
| YM***02 | Screw | 2 |
| YM***52 | Stud | 2 |
| YM***02 | Nut | 2 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1a Engine S/N 00101-Up : Balancer Shaft(#00101-20100)
| YM***10 | Balancer Ass'Y | 1 |
| YM***34 | Bearing,Ball | 2 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1a Engine S/N 00101-Up : Camshaft And Tappet(#00101-20100)
| YM***81 | Camshaft Ass'Y | 1 |
| YM***01 | Rod,Push | 2 |
| YM***60 | Tappet | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1a Engine S/N 00101-Up : Crankshaft(#00101-20100)
| YM***02 | Bolt Plated | 1 |
| YM***40 | Key | 1 |
| YM***00 | Crankshaft Ass'Y | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1a Engine S/N 00101-Up : Cylinder Block(#00101-20100)
| YM***40 | Cap Ass'Y,Oil Gauge | 1 |
| YM***20 | Seal | 1 |
| YM***08 | Seal,Oil | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1a Engine S/N 00101-Up : Cylinder Head
| YM***40 | Bolt | 2 |
| YM***00 | Valve,Intake | 1 |
| YM***80 | Retainer, Spring | 2 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1a Engine S/N 00101-Up : Cylinder Head Cover
| YM***40 | Spring | 1 |
| YM***02 | Screw | 2 |
| YM***01 | Shaft | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1a Engine S/N 00101-Up : Dynamo And Mounting(#00101-20100)
| YM***10 | Bracket | 1 |
| YM***90 | Dynamo Ass'Y | 1 |
| YM***42 | Screw | 3 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1a Engine S/N 00101-Up : Flywheel And Cooling Fan Case
| YM***01 | Case,Fan | 1 |
| YM***00 | Cushion | 4 |
| YM***92 | Flywheel Ass'Y | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1a Engine S/N 00101-Up : Front Cover
| YM***40 | Cap Ass'Y,Oil Gauge | 1 |
| YM***51 | Sensor,Oil Pressure | 1 |
| YM***08 | Seal,Oil | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1a Engine S/N 00101-Up : Fuel Feed Pump
| YM***00 | Feed Pump Ass'Y | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1a Engine S/N 00101-Up : Fuel Filter
| YM***00 | Gasket | 2 |
| YM***00 | O-Ring (Kit) | 1 |
| YM***50 | Plug,Air | 2 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1a Engine S/N 00101-Up : Fuel Injection Pump
| YM***20 | Packing | 1 |
| YM***50 | Seat | 1 |
| YM***08 | Pin,Spring | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1a Engine S/N 00101-Up : Fuel Injection Pump And Piping
| YM***30 | Cover | 1 |
| YM***50 | Pipe | 1 |
| YM***02 | Nut | 3 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1a Engine S/N 00101-Up : Fuel Nozzle And Spill Pipe
| YM***90 | Pipe | 1 |
| YM***00 | Holder Ass'Y | 1 |
| YM***20 | Spring | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1a Engine S/N 00101-Up : Gasket Kit
| YM***00 | Gasket (Kit) | 1 |
| YM***40 | Seal,Valve Stem (Kit) | 2 |
| YM***80 | O-Ring (Kit) | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1a Engine S/N 00101-Up : Governor Control(#00101-20100)
| YM***00 | Governor Lever Ass'Y | 1 |
| YM***52 | Spring,Return | 1 |
| YM***60 | Handle,Regulator | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1a Engine S/N 00101-Up : Lubricating Oil Filter
| YM***24 | O-Ring (Kit) | 1 |
| YM***22 | Screw | 2 |
| YM***60 | Filter,Oil | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1a Engine S/N 00101-Up : Lubricating Oil Pump
| YM***70 | Cover | 1 |
| YM***70 | O-Ring (Kit) | 1 |
| YM***42 | Bolt | 3 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1a Engine S/N 00101-Up : Muffler And Mounting
| YM***00 | Gasket (Kit) | 1 |
| YM***00 | Muffler | 1 |
| YM***62 | Bolt,(For Shipping) | 6 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1a Engine S/N 00101-Up : Piston And Connecting Rod
| YM***42 | Piston Ring Ass'Y | 1 |
| YM***23 | Piston Ass'Y | 1 |
| YM***02 | Piston Ring Ass'Y | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1a Engine S/N 00101-Up : Rocker Arm
| YM***62 | Arm | 1 |
| YM***52 | Arm | 1 |
| YM***61 | Support,Rocker Arm | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1a Engine S/N 00101-Up : Starting Motor
| YM***67 | Bolt | 2 |
| YM***10 | Starting Motor Ass'Y | 1 |
| YM***13 | Brush (-) | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1a Engine S/N 00101-Up : Starting Motor And Mounting
| YM***02 | Screw | 2 |
| (Y***0) | Starting Motor Ass'Y,(See Fig.0661) | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1a Engine S/N 00101-Up : Tool
| YM***60 | Wrench,Fuel Filter? Water Separator | 1 |
| YM***21 | Puller,Flywheel | 1 |
| YM***54 | Bolt | 3 |
1d84-1b Engine S/N 00101-Up
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1b Engine S/N 00101-Up : Air Cleaner And Mounting
| YM***50 | Sponge | 1 |
| YM***50 | Nut | 1 |
| YM***60 | Washer,Seal | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1b Engine S/N 00101-Up : Air Intake Manifold And Connection
| YM***02 | Screw | 2 |
| YM***52 | Stud | 2 |
| YM***02 | Nut | 2 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1b Engine S/N 00101-Up : Balancer Shaft(#20101-)
| YM***34 | Bearing,Ball | 2 |
| YM***10 | Balancer Ass'Y | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1b Engine S/N 00101-Up : Camshaft And Tappet(#20101-)
| YM***81 | Camshaft Ass'Y | 1 |
| YM***01 | Rod,Push | 2 |
| YM***60 | Tappet | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1b Engine S/N 00101-Up : Crankshaft(#20101-)
| YM***02 | Bolt Plated | 1 |
| YM***00 | Crankshaft Ass'Y | 1 |
| YM***40 | Key | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1b Engine S/N 00101-Up : Cylinder Block(#20101-)
| YM***40 | Cap Ass'Y,Oil Gauge | 1 |
| YM***20 | Seal | 1 |
| YM***08 | Seal,Oil | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1b Engine S/N 00101-Up : Cylinder Head
| YM***40 | Bolt | 2 |
| YM***00 | Valve,Intake | 1 |
| YM***80 | Retainer, Spring | 2 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1b Engine S/N 00101-Up : Cylinder Head Cover
| YM***40 | Spring | 1 |
| YM***02 | Screw | 2 |
| YM***01 | Shaft | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1b Engine S/N 00101-Up : Dynamo And Mounting(#20101-)
| YM***90 | Dynamo Ass'Y | 1 |
| YM***42 | Screw | 3 |
| YM***30 | Stator | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1b Engine S/N 00101-Up : Flywheel And Cooling Fan Case
| YM***01 | Case,Fan | 1 |
| YM***00 | Cushion | 4 |
| YM***92 | Flywheel Ass'Y | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1b Engine S/N 00101-Up : Front Cover
| YM***40 | Cap Ass'Y,Oil Gauge | 1 |
| YM***51 | Sensor,Oil Pressure | 1 |
| YM***08 | Seal,Oil | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1b Engine S/N 00101-Up : Fuel Feed Pump
| YM***00 | Feed Pump Ass'Y | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1b Engine S/N 00101-Up : Fuel Filter
| YM***00 | Gasket | 2 |
| YM***00 | O-Ring (Kit) | 1 |
| YM***50 | Plug,Air | 2 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1b Engine S/N 00101-Up : Fuel Injection Pump
| YM***20 | Packing | 1 |
| YM***50 | Seat | 1 |
| YM***08 | Pin,Spring | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1b Engine S/N 00101-Up : Fuel Injection Pump And Piping
| YM***30 | Cover | 1 |
| YM***50 | Pipe | 1 |
| YM***02 | Nut | 3 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1b Engine S/N 00101-Up : Fuel Nozzle And Spill Pipe
| YM***90 | Pipe | 1 |
| YM***00 | Holder Ass'Y | 1 |
| YM***20 | Spring | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1b Engine S/N 00101-Up : Gasket Kit
| YM***00 | Gasket (Kit) | 1 |
| YM***40 | Seal,Valve Stem (Kit) | 2 |
| YM***80 | O-Ring (Kit) | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1b Engine S/N 00101-Up : Governor Control(#20101-)
| YM***00 | Governor Lever Ass'Y | 1 |
| YM***00 | Governor Ass'Y | 1 |
| YM***52 | Spring,Return | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1b Engine S/N 00101-Up : Lubricating Oil Filter
| YM***24 | O-Ring (Kit) | 1 |
| YM***22 | Screw | 2 |
| YM***60 | Filter,Oil | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1b Engine S/N 00101-Up : Lubricating Oil Pump
| YM***70 | Cover | 1 |
| YM***70 | O-Ring (Kit) | 1 |
| YM***42 | Bolt | 3 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1b Engine S/N 00101-Up : Muffler And Mounting
| YM***00 | Gasket (Kit) | 1 |
| YM***00 | Muffler | 1 |
| YM***62 | Bolt,(For Shipping) | 6 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1b Engine S/N 00101-Up : Piston And Connecting Rod
| YM***42 | Piston Ring Ass'Y | 1 |
| YM***23 | Piston Ass'Y | 1 |
| YM***02 | Piston Ring Ass'Y | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1b Engine S/N 00101-Up : Rocker Arm
| YM***62 | Arm | 1 |
| YM***52 | Arm | 1 |
| YM***61 | Support,Rocker Arm | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1b Engine S/N 00101-Up : Starting Motor
| YM***67 | Bolt | 2 |
| YM***10 | Starting Motor Ass'Y | 1 |
| YM***13 | Brush (-) | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1b Engine S/N 00101-Up : Starting Motor And Mounting
| YM***02 | Screw | 2 |
| (Y***0) | Starting Motor Ass'Y,(See Fig.0661) | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : 1d84-1b Engine S/N 00101-Up : Tool
| YM***60 | Wrench,Fuel Filter? Water Separator | 1 |
| YM***21 | Puller,Flywheel | 1 |
| YM***54 | Bolt | 3 |
Control System And Revolving Frame
Komatsu : Pc03-1(S/N 1001-Up) : Control System And Revolving Frame : Arm And Swing Control Lever
| 01***25 | Bolt,Without Revolution Sensor | 2 |
| 01***30 | Bolt,(For Mechanical Governor) | 3 |
| 01***05 | Nut,L.H. Thread (D31s) | 2 |
Komatsu : Pc03-1(S/N 1001-Up) : Control System And Revolving Frame : Arm And Swing Control Lever (With Quick Shift) (Komatsu Pattern)
| 01***16 | Bolt (With Air Heater & Conditioner) | 2 |
| 01***25 | Bolt,Without Revolution Sensor | 2 |
| 01***30 | Bolt,(For Mechanical Governor) | 5 |
Komatsu : Pc03-1(S/N 1001-Up) : Control System And Revolving Frame : Attachment Control Pedal
| 01***16 | Bolt, Mount Solenoid Valve | 2 |
| 01***20 | Bolt,(Forwarded Individually Parts) | 2 |
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 2 |
Komatsu : Pc03-1(S/N 1001-Up) : Control System And Revolving Frame : Boom Swing Control Pedal
| 01***16 | Bolt, Mount Solenoid Valve | 2 |
| 01***20 | Bolt,(Forwarded Individually Parts) | 2 |
| 01***05 | Nut,L.H. Thread (D31s) | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : Control System And Revolving Frame : Boom Swing Control Pedal (With Quick Shift)
| 01***16 | Bolt, Mount Solenoid Valve | 2 |
| 01***20 | Bolt,(Forwarded Individually Parts) | 2 |
| 01***05 | Nut,L.H. Thread (D31s) | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : Control System And Revolving Frame : Boom? Bucket And Blade Control Lever
| 01***25 | Bolt,Without Revolution Sensor | 2 |
| 01***05 | Nut,L.H. Thread (D31s) | 3 |
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 4 |
Komatsu : Pc03-1(S/N 1001-Up) : Control System And Revolving Frame : Boom? Bucket And Blade Control Lever (With Quick Shift)
| 01***25 | Bolt,Without Revolution Sensor | 2 |
| 01***05 | Nut,L.H. Thread (D31s) | 3 |
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 4 |
Komatsu : Pc03-1(S/N 1001-Up) : Control System And Revolving Frame : Fuel Control Lever
| 01***30 | Bolt,Stopper | 1 |
| 01***50 | Bolt,(Tm8072-089) | 1 |
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 2 |
Komatsu : Pc03-1(S/N 1001-Up) : Control System And Revolving Frame : Revolving Frame
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
| 01***85 | Bolt, Mount Tubes To Switch And Work Pumps | 2 |
| 01***20 | Bolt,(Forwarded Individually Parts) | 2 |
Komatsu : Pc03-1(S/N 1001-Up) : Control System And Revolving Frame : Travel Control Lever
| 01***16 | Bolt (With Air Heater & Conditioner) | 1 |
| 01***16 | Bolt, Mount Solenoid Valve | 4 |
| 01***05 | Nut,L.H. Thread (D31s) | 2 |
Komatsu : Pc03-1(S/N 1001-Up) : Control System And Revolving Frame : Travel Control Lever (With Quick Shift)
| 01***16 | Bolt (With Air Heater & Conditioner) | 1 |
| 01***16 | Bolt, Mount Solenoid Valve | 4 |
| 01***05 | Nut,L.H. Thread (D31s) | 2 |
Komatsu : Pc03-1(S/N 1001-Up) : Control System And Revolving Frame : Work Equipment Control Lock Lever
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 4 |
| 01***30 | Bolt | 4 |
| 01***16 | Washer,(With Water Separator) | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : Control System And Revolving Frame : Work Equipment Control Lock Lever (Tbg Spec.)
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 4 |
| 01***30 | Bolt | 4 |
| 01***16 | Washer,(With Water Separator) | 1 |
Engine Related Parts And Electrical System
Komatsu : Pc03-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Battery
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 4 |
| 21***10 | Battery? 12v 35ah | 1 |
| 21***40 | Holder | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Electrical System (1/2) (Instrument Panel Line)
| 01***16 | Bolt, Mount Solenoid Valve | 3 |
| 01***04 | Nut,(For Air Conditioner Less) | 1 |
| 20***30 | Screw | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Electrical System (2/2) (Chassis Line)
| 01***10 | Bolt - Relay And Flasher Mounting | 1 |
| 01***12 | Bolt,(See Fig. K0210-16a0) | 1 |
| 01***12 | Bolt,(With Speedometer) | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Engine Mounting And Related Parts
| 01***45 | Bolt,(For Power Tilt Mech Angle) | 4 |
| 01***08 | Nut,(For Canvas Canopy?Head Guard) | 4 |
| 01***10 | Nut,(Without Air Conditioner) | 8 |
Komatsu : Pc03-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Fuel Tank And Piping
| 01***20 | Bolt,(With Auto Emergency Steering) | 3 |
| 01***12 | Bolt,(See Fig. K0210-16a0) | 2 |
| 01***16 | Bolt, Mount Solenoid Valve | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Instrument Panel
| 08***00 | Switch,(Sandy And Dusty Terrain S.) | 1 |
| 08***30 | Bulb? 4w,(Exchange Parts) | 3 |
| 20***30 | Screw | 4 |
Komatsu : Pc03-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Instrument Panel (Tbg Spec.) (German)
| 08***00 | Switch,Starting (Tbg Spec.) | 1 |
| 08***30 | Bulb? 4w,(Exchange Parts) | 3 |
| 20***30 | Screw | 4 |
Komatsu : Pc03-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Power Take Off
| 01***20 | Bolt,(With Auto Emergency Steering) | 1 |
| 01***35 | Bolt,(For Position Fixing) | 4 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 5 |
Guard
Komatsu : Pc03-1(S/N 1001-Up) : Guard : Canopy
| 01***40 | Bolt,(With Service Valve R.H.) | 4 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 4 |
| 21***00 | Canopy Ass'Y | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : Guard : Canopy (Tbg Spec.)
| 01***40 | Bolt,(With Service Valve R.H.) | 4 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 4 |
| 21***10 | Insulator | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : Guard : Floor Plate (Tbg Spec.)(#2131-)
| 01***12 | Bolt,(See Fig. K0210-16a0) | 2 |
| 01***12 | Bolt,(With Speedometer) | 5 |
| 01***16 | Bolt, Mount Solenoid Valve | 12 |
Komatsu : Pc03-1(S/N 1001-Up) : Guard : Floor Plate (With Attachment)
| 01***12 | Bolt,(See Fig. K0210-16a0) | 2 |
| 01***12 | Bolt,(With Speedometer) | 5 |
| 01***16 | Bolt, Mount Solenoid Valve | 12 |
Komatsu : Pc03-1(S/N 1001-Up) : Guard : Floor Plate (With Quick Shift)(#2131-)
| 01***12 | Bolt,(See Fig. K0210-16a0) | 2 |
| 01***12 | Bolt,(With Speedometer) | 5 |
| 01***16 | Bolt, Mount Solenoid Valve | 12 |
Komatsu : Pc03-1(S/N 1001-Up) : Guard : Floor Plate(#1001-2130) : Unit_02_of_02
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 4 |
| 01***12 | Bolt,(See Fig. K0210-16a0) | 2 |
| 01***12 | Bolt,(With Speedometer) | 5 |
Komatsu : Pc03-1(S/N 1001-Up) : Guard : Floor Plate(#1001-2130) : Unit_01_of_02
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 4 |
| 01***12 | Bolt,(See Fig. K0210-16a0) | 2 |
| 01***12 | Bolt,(With Speedometer) | 5 |
Komatsu : Pc03-1(S/N 1001-Up) : Guard : Machine Cab
| 01***16 | Bolt (With Air Heater & Conditioner) | 2 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 4 |
| 01***16 | Bolt, Mount Solenoid Valve | 4 |
Komatsu : Pc03-1(S/N 1001-Up) : Guard : Operator'S Seat
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 4 |
| 01***23 | Washer, Flat | 1 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 4 |
Mark Plate? Tool And Kit
Komatsu : Pc03-1(S/N 1001-Up) : Mark Plate? Tool And Kit : Marks And Plates (English) (Except For Ec)(#1001-9702)
| 04***60 | Screw,Machine Model (For Ec Reg.) | 4 |
| 09***35 | Plate? Name,(Limited Supply) (English) | 1 |
| 09***02 | Plate? Caution,Fuel Filler | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : Mark Plate? Tool And Kit : Marks And Plates (English) (Except For Ec)(#9703-)
| 04***60 | Screw,Machine Model (For Ec Reg.) | 4 |
| 09***35 | Plate? Name,(Limited Supply) (English) | 1 |
| 09***04 | Plate, Operating, Hydraulic Cooler Lock | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : Mark Plate? Tool And Kit : Marks And Plates (English) (For Ec) (Except Tbg Spec.)(#1001-9702)
| 04***60 | Screw,Machine Model (For Ec Reg.) | 4 |
| 09***35 | Plate? Name,(Limited Supply) (English) | 1 |
| 09***02 | Plate? Caution,Fuel Filler | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : Mark Plate? Tool And Kit : Marks And Plates (English) (For Ec) (Except Tbg Spec.)(#9703-)
| 04***60 | Screw,Machine Model (For Ec Reg.) | 4 |
| 09***35 | Plate? Name,(Limited Supply) (English) | 1 |
| 09***04 | Plate, Operating, Hydraulic Cooler Lock | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : Mark Plate? Tool And Kit : Marks And Plates (German) (Tbg Spec.)(#1001-9702)
| 04***60 | Screw,Machine Model (For Ec Reg.) | 4 |
| 09***35 | Plate? Name,(Limited Supply) (German) | 1 |
| 09***01 | Plate? Operating,Work Equipment Control Lock Le | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : Mark Plate? Tool And Kit : Marks And Plates (German) (Tbg Spec.)(#9703-)
| 04***60 | Screw,Machine Model (For Ec Reg.) | 4 |
| 09***35 | Plate? Name,(Limited Supply) (German) | 1 |
| 09***01 | Plate? Operating,Work Equipment Control Lock Le | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : Mark Plate? Tool And Kit : Tool
| 07***50 | Pump, (Bellows Type) | 1 |
| 07***03 | Cartridge - Grease | 1 |
| 07***22 | Nozzle, Grease Pump | 1 |
Swing System
Komatsu : Pc03-1(S/N 1001-Up) : Swing System : Swing Circle
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 10 |
| 01***45 | Bolt,(For Power Tilt Mech Angle) | 12 |
| 04***28 | Pin, Dowel - Transmission Case, Pin-Dowel | 2 |
Under Carriage
Komatsu : Pc03-1(S/N 1001-Up) : Under Carriage : Front Idler
| 04***50 | Pin, Spring | 2 |
| 07***21 | O-Ring,Water Piping | 2 |
| 10***30 | Seal Ring Ass'Y | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : Under Carriage : Hydraulic Piping (Travel Motor Line) (Lower)
| 01***25 | Bolt,Without Revolution Sensor | 4 |
| 01***25 | Bolt,See Fig. K4010-65a0 | 12 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 4 |
Komatsu : Pc03-1(S/N 1001-Up) : Under Carriage : Rubber Shoe
| 21***10 | Rubber Shoe Ass'Y | 2 |
Komatsu : Pc03-1(S/N 1001-Up) : Under Carriage : Sprocket
| 01***25 | Bolt,See Fig. K4010-65a0 | 12 |
| 21***10 | Sprocket | 2 |
Komatsu : Pc03-1(S/N 1001-Up) : Under Carriage : Track Frame
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 8 |
| 01***20 | Bolt, Adapter Mounting | 4 |
| 01***12 | Bolt,(With Speedometer) | 10 |
Komatsu : Pc03-1(S/N 1001-Up) : Under Carriage : Track Roller
| 07***21 | O-Ring,Water Piping | 2 |
| 10***30 | Seal Ring Ass'Y | 1 |
| 10***40 | O-Ring Ass'Y | 1 |
Work Equipment
Komatsu : Pc03-1(S/N 1001-Up) : Work Equipment : Arm
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***32 | Washer,(With Auto Emergency Steering) | 2 |
| 07***00 | Fitting, Grease - Upper Hinge Pin | 2 |
Komatsu : Pc03-1(S/N 1001-Up) : Work Equipment : Arm Cylinder
| 07***48 | O-Ring,(F4350-64a0 -21 ) | 1 |
| 07***45 | O-Ring,(F4350-60a0 -9 ) | 1 |
| 07***56 | Seal,Dust (Kit) | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : Work Equipment : Arm Cylinder (For Attachment)
| 07***25 | O-Ring,Corrosion Resistor | 1 |
| 21***30 | Spacer | 1 |
| (2***0) | Cylinder Ass'Y,Arm (See Fig.7381) Paint(1) | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : Work Equipment : Blade
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***32 | Washer,(With Auto Emergency Steering) | 4 |
| 07***00 | Fitting, Grease - Upper Hinge Pin | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : Work Equipment : Blade Cylinder
| 07***48 | O-Ring,(F4350-64a0 -21 ) | 1 |
| 07***45 | O-Ring,(F4350-60a0 -9 ) | 1 |
| 07***56 | Seal,Dust (Kit) | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : Work Equipment : Boom
| 01***18 | Bolt | 2 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***16 | Bolt, Mount Solenoid Valve | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : Work Equipment : Boom Cylinder
| 07***48 | O-Ring,(F4350-64a0 -21 ) | 1 |
| 07***45 | O-Ring,(F4350-60a0 -9 ) | 2 |
| 07***45 | Ring,Back-Up (Kit) | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : Work Equipment : Bracket (For Attachment)
| 11***05 | Pin Ass'Y (Welded) | 2 |
| 21***11 | Bracket (Paint1) | 1 |
| 21***20 | Pin | 2 |
Komatsu : Pc03-1(S/N 1001-Up) : Work Equipment : Bucket Cylinder
| 07***48 | O-Ring,(F4350-64a0 -21 ) | 1 |
| 07***45 | O-Ring,(F4350-60a0 -9 ) | 1 |
| 07***56 | Seal,Dust (Kit) | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : Work Equipment : Bucket Link
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 2 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***32 | Washer,(With Auto Emergency Steering) | 6 |
Komatsu : Pc03-1(S/N 1001-Up) : Work Equipment : Bucket? 0.015m3 (Mini 0.02m3) 250mm
| 10***20 | Tooth (Welded) | 2 |
| 21***60 | Edge,Side (Welded) | 2 |
| 21***10 | Bucket Ass'Y | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : Work Equipment : Bucket? 0.02m3 (Mini 0.06m3) 320mm
| 10***20 | Tooth (Welded) | 3 |
| 21***10 | Bucket Ass'Y Paint(1) | 1 |
| 21***20 | Edge (Welded) | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : Work Equipment : Hydraulic Piping (Attachment Line) (Hoe Side)
| 01***12 | Bolt,(With Speedometer) | 3 |
| 07***03 | Bushing | 2 |
| 07***30 | Seal,Dust (Kit) | 2 |
Komatsu : Pc03-1(S/N 1001-Up) : Work Equipment : Hydraulic Piping (Blade Cylinder Line)
| 20***60 | Elbow | 2 |
| 21***10 | Hose | 1 |
| 21***20 | Hose | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : Work Equipment : Hydraulic Piping (Boom? Arm? Bucket Cylinder Line) (Hoe Side)
| 01***45 | Bolt | 2 |
| 01***16 | Screw | 2 |
| 01***12 | Bolt,(With Speedometer) | 9 |
Komatsu : Pc03-1(S/N 1001-Up) : Work Equipment : Hydraulic Piping (Boom? Arm? Bucket Cylinder Line) (Hoe Side) (Tbg Spec.)
| 01***55 | Bolt | 2 |
| 01***16 | Screw | 2 |
| 01***12 | Bolt,(With Speedometer) | 9 |
Komatsu : Pc03-1(S/N 1001-Up) : Work Equipment : Long Arm
| 07***25 | Seal,Dust (Kit) | 6 |
| 20***70 | Hose | 2 |
| 21***90 | Bushing | 6 |
Komatsu : Pc03-1(S/N 1001-Up) : Work Equipment : Swing Bracket
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 3 |
| 01***32 | Washer,(With Auto Emergency Steering) | 3 |
| 07***00 | Fitting, Grease - Upper Hinge Pin | 3 |
Komatsu : Pc03-1(S/N 1001-Up) : Work Equipment : Swing Cylinder
| 07***48 | O-Ring,(F4350-64a0 -21 ) | 1 |
| 07***45 | O-Ring,(F4350-60a0 -9 ) | 1 |
| 07***56 | Seal,Dust (Kit) | 1 |
Work Equipment Control System
Komatsu : Pc03-1(S/N 1001-Up) : Work Equipment Control System : 1-Spool Control Valve (For Attachment)
| 01***10 | Bolt | 2 |
| 01***16 | Bolt (Op) | 2 |
| 01***20 | Bolt (Itl) | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : Work Equipment Control System : 8-Spool Control Valve (1/2)
| 01***10 | Bolt | 16 |
| 01***16 | Bolt (Op) | 16 |
| 01***20 | Bolt (Itl) | 8 |
Komatsu : Pc03-1(S/N 1001-Up) : Work Equipment Control System : 8-Spool Control Valve (2/2)
| 01***08 | Nut (Op) | 1 |
| 07***11 | O-Ring (Kit) | 1 |
| 07***34 | O-Ring,(Not Used When (B) Spec.) | 2 |
Komatsu : Pc03-1(S/N 1001-Up) : Work Equipment Control System : Hydraulic Piping (Additional Valve Line) (With Attachment)
| 01***20 | Bolt,(Forwarded Individually Parts) | 1 |
| 01***25 | Bolt - Relay Mounting | 7 |
| 07***34 | O-Ring, O-Ring,Drain Plug? R.H. Half Tank | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : Work Equipment Control System : Hydraulic Piping (Suction And Return Line)
| 01***16 | Bolt (With Air Heater & Conditioner) | 1 |
| 01***25 | Bolt,Without Revolution Sensor | 2 |
| 01***30 | Bolt,(For Mechanical Governor) | 3 |
Komatsu : Pc03-1(S/N 1001-Up) : Work Equipment Control System : Hydraulic Piping (Suction And Return Line) (With Attachment)
| 01***16 | Bolt (With Air Heater & Conditioner) | 1 |
| 01***25 | Bolt,Without Revolution Sensor | 2 |
| 01***30 | Bolt,(For Mechanical Governor) | 3 |
Komatsu : Pc03-1(S/N 1001-Up) : Work Equipment Control System : Hydraulic Piping (Swing Motor And Swing Cylinder Line)
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***30 | Bolt,(Tm8072-121) | 2 |
| 01***32 | Washer,(With Auto Emergency Steering) | 4 |
Komatsu : Pc03-1(S/N 1001-Up) : Work Equipment Control System : Hydraulic Piping (Travel And Blade Line)
| 07***23 | O-Ring,(For 2nd Travel Speed) (Op) | 6 |
| 20***60 | Elbow | 4 |
| 20***60 | Nipple,(For 20p-62-72566 Hose) | 2 |
Komatsu : Pc03-1(S/N 1001-Up) : Work Equipment Control System : Hydraulic Pump (1/2)
| 04***13 | Key | 1 |
| 04***12 | Ring,Snap | 1 |
| 21***00 | Pump Ass'Y | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : Work Equipment Control System : Hydraulic Pump (2/2)
| 21***00 | Seal Kit | 1 |
| 21***10 | Gasket (Kit) | 4 |
| 21***20 | O-Ring (Kit) | 2 |
Komatsu : Pc03-1(S/N 1001-Up) : Work Equipment Control System : Hydraulic Tank
| 01***20 | Bolt,(With Auto Emergency Steering) | 6 |
| 01***16 | Bolt, Mount Solenoid Valve | 1 |
| 01***20 | Bolt,(Forwarded Individually Parts) | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : Work Equipment Control System : Swing Motor
| 21***00 | Motor Ass'Y | 1 |
| 21***01 | Motor Ass'Y | 1 |
| 21***10 | Flange | 1 |
Komatsu : Pc03-1(S/N 1001-Up) : Work Equipment Control System : Swivel Joint
| 01***18 | Bolt, Mount Cover | 4 |
| 04***18 | Ring,Snap (With Emergency Steering) | 1 |
| 07***45 | O-Ring,Without Revolution Sensor | 7 |
Komatsu : Pc03-1(S/N 1001-Up) : Work Equipment Control System : Travel Motor (1/3)
| 20***70 | Plug | 3 |
| 20***10 | Floating Seal Ass'Y | 1 |
| 20***20 | Bearing | 2 |
Komatsu : Pc03-1(S/N 1001-Up) : Work Equipment Control System : Travel Motor (3/3)
| 01***20 | Screw | 6 |
| 04***12 | Pin,Spring (See Fig.0201) | 1 |
| 07***10 | O-Ring,Plate | 4 |
Komatsu : Pc03-1(S/N 1001-Up) : Work Equipment Control System : Travle Motor (2/3)
| 04***12 | Pin, Spring | 6 |
| 04***10 | Ring,See Fig. K4010-65a0 | 1 |
| 04***12 | Ring, Snap | 1 |
PC03-1(S/N 1001-UP) serial number reference
On the PC03-1, the product ID/serial plate is a small riveted or glued Komatsu plate on the machine, typically low on the machine near the boom/track-frame area rather than in a cab (this model has no cab). A Komatsu decal sometimes overlays a stamped number in that area. Because this model predates Komatsu's standard alpha-prefix PIN format, the plate shows the model designation (PC03-1) followed by a plain sequential serial number (4-5 digits) rather than a 3-character letter-plus-digits prefix. Confirm exact plate location with your dealer for this specific unit.
| Prefix | Identifies | Notes |
|---|---|---|
| 1001-UP | PC03-1 base/only production run (Japan-domestic mini excavator) | Parts manuals for this model are issued against a plain numeric serial start of 1001 and up, with no 3-character alpha PIN prefix (no A-, B-, F-, H- style code). This matches the machine's status as a small Japan-market unit that predates Komatsu's standard alpha-prefix PIN scheme used on larger excavators. Confirm with dealer if a plate-stamped alpha prefix exists on a specific unit. |
| 4126-UP | Same PC03-1 designation, later production serial break (operation and maintenance manual only) | The operation and maintenance manual for this model is scoped from serial 4126 and up, separate from the parts-catalog break at 1001-UP. This is a running serial break within the PC03-1 line, not a distinct variant or engine change; specifics of what changed at 4126 are not documented in available sources. Confirm with dealer. |
Frequently asked questions
What engine powers the Komatsu PC03-1(S/N 1001-up)?
A Komatsu 1D84-1A single-cylinder mechanical diesel engine producing roughly 5.5 kW (7.4 hp). It uses fully mechanical fuel injection with no electronic engine controls or fault codes.
What is the operating weight of the PC03-1(S/N 1001-up)?
Approximately 0.75 metric tons (about 1,650 lb), making it one of the lightest excavators Komatsu ever built.
What replaced the Komatsu PC03-1?
Komatsu continued the PC03 platform with later production blocks documented as the PC03-2-EC and PC03-2-K (S/N 15001-up). These should be treated as later updates to the same micro-excavator concept rather than a confirmed direct replacement, since no factory succession document ties them explicitly to the 1001-up serial range.
What PC03-1(S/N 1001-UP) owners discuss
Is there much real owner or mechanic discussion of the PC03-1 (S/N 1001-up) online?
Very little. This was a low-volume, entry-level micro excavator from the early 1990s at roughly 0.75 t operating weight, sold mainly for light utility and landscaping work, and it never built the following of Komatsu's mainstream PC-series. Discoverable discussion tends to lump this class of single-cylinder micro excavator together with other early-1990s sub-1-tonne machines, so the notes below draw on that broader consensus for the machine class and engine family rather than model-specific testimonials. Anything presented as a hard number below is flagged as such.
How does the powertrain and hydraulic system typically behave on a machine this size and age?
The single-cylinder mechanical diesel drives the hydraulic pump directly with no electronic control layer, so response is simple but unhurried: expect noticeably slower boom/arm/swing speed than a modern mini, especially before the oil warms up. Dig force is modest by design at this weight class, so it's suited to trenching and light digging, not prying or heavy breakout work. On machines this old, weeping around cylinder rod seals and hose fittings is common and mostly cosmetic if minor. Hydraulic filtration on a machine this small is basic, so oil cleanliness matters more than on larger excavators — contaminated oil shows up faster as sluggish or jerky cylinder movement.
What undercarriage or wear patterns are typical for a micro excavator in this class?
Track tension on small excavators of this era needs frequent checking — components loosen with use and a saggy track wears rollers and idlers faster. Because seals and guards on a sub-1-tonne machine are minimal, grit ingress into rollers and idlers is the main undercarriage wear driver, more so than on larger machines with better-sealed final drives. Track sag spec for this exact model is not documented — verify the factory figure with your dealer rather than eyeballing it. Visibly uneven tread wear, cracking, or exposed cord is a sign to budget for undercarriage replacement soon, since that's one of the costlier repairs relative to the machine's value at this size.
What quirks are commonly reported for this era of single-cylinder mechanical diesel engine?
Cold starting is the recurring theme for small mechanical diesels of this vintage — without a working decompression lever or preheat aid, cranking effort and start time both increase sharply in cool weather. A mechanical governor at this scale tends to show a slightly uneven or 'hunting' idle rather than a rock-steady one, which is normal wear behavior rather than a fault by itself. Oil consumption creeps up gradually as rings and bores wear, and because there's no engine monitoring to flag it, it's easy to miss until it shows up as smoke or frequent top-offs. Injection timing and valve clearance on engines like this are set manually and drift over years without adjustment.
What electrical or sensor issues come up for this machine?
This generation of mechanical fuel-injection diesel has no ECM and no sensor network, so there's nothing to throw a fault code. Electrical problems are limited to the basics: weak or sulfated battery, corroded ground straps, a tired starter solenoid, and (on units equipped with one) a glow plug or preheat relay that no longer heats reliably. Intermittent no-start complaints on machines this age usually trace back to one of those simple items rather than anything exotic — check grounds and battery condition first.
Is hydraulic cylinder drift a common complaint on machines this old?
Yes. On a decades-old micro excavator, worn rod and piston seals commonly let the boom, arm, or bucket cylinders creep down under load over a few minutes with the machine sitting idle. Minor drift is typical wear and not unusual for the age. Have your dealer pressure-test the cylinders and inspect seals before relying on the machine for suspended-load or overhead work, since seal failure under load is a safety issue, not just a productivity one.
What should a buyer check before purchasing a used PC03-1 (S/N 1001-up)?
Start the engine cold if possible and note cranking effort and smoke on startup, since hard cold starting points at compression or injection wear. Cycle every hydraulic function through full travel and watch for hesitation, chatter, or drift once cylinders are extended and left to sit. Walk the tracks and check roller and idler play, track tension, and any exposed cord or cracking on rubber-tracked units. Check boom, arm, and bucket pin and bushing play by rocking each joint under light hydraulic pressure. Compare the hour meter reading against overall wear — a low reading on a heavily worn machine is a red flag on equipment this old. Confirm the engine and any replaced hydraulic components actually match this model and serial range rather than parts sourced from a related PC03 variant, since specs and fittings differ across the family. Finally, have a dealer or qualified technician verify compression and hydraulic system integrity before purchase — this is a safety-relevant check, not just a value check.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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