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Komatsu EG300BS-5(S/N 5001-UP)

Maintenance schedule, common problems & OEM parts breakdown

Search live EG300BS-5(S/N 5001-UP) parts

The Komatsu EG300BS-5 (S/N 5001-UP) is a stationary diesel engine-generator set, not a mobile or tracked machine. It is built around the Komatsu S6D140-1, a six-cylinder, water-cooled, turbocharged diesel engine with a mechanical inline fuel-injection pump and mechanical governor and no electronic engine control, consistent with the -5 generation of Komatsu's EG-series industrial gensets. The EG300 platform was offered in at least three enclosure configurations sharing the same engine and generator end: an open/skid base unit (EG300-5), a weatherproof bonnet version (EG300B-5), and this bonnet-plus-soundproof-canopy version (EG300BS-5), aimed at noise-sensitive job sites. Exact operating weight and rated kVA/kW output are not documented for this specific S/N 5001-UP range and vary with voltage, frequency, and base configuration, so they should be confirmed from the unit nameplate or a Komatsu dealer rather than assumed.

Across the EG-series lineup, Komatsu progressed the same core engine-and-alternator package through increasingly enclosed configurations: base skid, bonnet, bonnet-plus-soundproofing, and on some larger displacement siblings a trailer-mounted BST variant, largely to meet tightening site-noise and weather-protection requirements rather than to change output. The EG300BS-5's mechanical fuel system and governor make it a straightforward set to service and troubleshoot without diagnostic tooling, which keeps it attractive on the used and parts market even as Komatsu has moved newer generator platforms toward electronically controlled engines. Because the S6D140-1 block and its mechanical fuel-injection components are shared across other Komatsu equipment of the same era, parts availability for the engine side stays healthier than for generator-specific components like the control panel, alternator end, and soundproof canopy panels, which are the parts most often sourced used or remanufactured for this set.

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 EG300BS-5(S/N 5001-UP) specifications

Engine

Engine modelKomatsu S6D140-1 (also referenced as S6D140-1L), 6-cylinder diesel
AspirationTurbocharged, water-cooled; naturally aspirated status not separately confirmed for this genset tune
DisplacementApprox. 15.2 L (928 cu in), consistent with 140 mm bore
Cylinders6, inline, water-cooled diesel
Gross/net powerNot documented for this exact serial range under genset duty — verify with dealer or engine nameplate. Same S6D140-1 block is used across multiple host machines (wheel loaders, other industrial applications) at differing application-specific ratings, so a single output figure cannot be assumed for this generator set
Emissions tierNot documented — this is a mechanically governed, pre-electronic-tier industrial diesel typical of the era

Weights

Operating/shipping weightNot documented in accessible factory literature for this serial range — verify with dealer or nameplate
Ground pressureNot applicable — stationary/skid-mounted engine-generator set

Dimensions

Transport length/width/heightNot documented in accessible factory literature for this serial range — verify with dealer or nameplate
Enclosure/skid footprintNot documented for this exact model

Performance

Rated output (kVA/kW)Not confirmed for this exact EG300BS-5 (S/N 5001-UP) generation. A later, differently-numbered Komatsu genset generation in the same power class is documented separately at roughly 276 kVA (221 kW) prime / 304 kVA (243 kW) standby at 50 Hz, but that figure belongs to a newer product line and should not be assumed for this unit
Frequency/voltage optionsNot documented for this exact model — EG-series sets of this class were typically offered in 50 Hz and 60 Hz variants with multiple voltage taps, per factory literature for the family

Service capacities (summary)

Fuel tankNot documented in accessible sources for this serial range — verify with dealer or nameplate
Cooling systemWater-cooled engine; capacity not documented for this exact model
Engine oilNot documented for this exact model
Hydraulic systemNot applicable — engine-generator set has no hydraulic system

Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.

EG300BS-5(S/N 5001-UP) fluids & capacities

SystemCapacityRecommended fluid
Engine crankcase (with filter) - S6D140-1 dieselNot documented in public sources for this exact serial range. Comparable Komatsu S6D140-family industrial/generator engines typically run in the 30-40 L (7.9-10.6 US gal) band - varies by configuration/series. Verify against the dipstick marks or dealer OMM for S/N 5001-UP.Komatsu Genuine engine oil (EO series). Viscosity graded by ambient temperature per the standard Komatsu chart - SAE10W in cold climates, SAE30 or SAE10W-30 in temperate climates, SAE40 or SAE15W-40 in hot climates. Use an oil meeting Komatsu's diesel engine oil spec (API CI-4 or better).
Cooling system (radiator and engine block) - S6D140-1Not documented in public sources for this exact serial range. Comparable S6D140-class Komatsu generator sets (same bore/stroke family) run roughly 60-125 L (15.9-33 US gal) depending on radiator and aftercooler configuration - varies by configuration/series. Confirm against the radiator fill mark or dealer OMM for S/N 5001-UP.Komatsu Supercoolant AF-NAC (or equivalent), mixed with clean water per the label ratio for year-round freeze and corrosion protection. Meets Komatsu's antifreeze/coolant specification.
Fuel tank (base or skid-mounted)Not documented for this exact serial range in available sources. Fuel tank size on EG-series generator sets is set by the genset package/skid, not the engine alone, so it cannot be inferred reliably. Confirm the tank capacity from the unit nameplate or dealer OMM for S/N 5001-UP.No. 2 diesel fuel meeting Komatsu's fuel specification; use low-sulfur diesel matched to local emissions requirements. Avoid mixing with gasoline or used oil.
Transmission, final drives, hydraulic system, axles/differentialsNot applicable.Not applicable. The EG300BS-5 is a stationary engine-generator set with no drivetrain, final drives, hydraulic propulsion system, or axles; the OMM does not list refill points for these systems.
Grease points (fan/idler bearings, linkage) - spec onlySpec only - no refill volume is published for this unit.Komatsu Genuine multipurpose lithium-based EP grease (NLGI No. 2 grade or equivalent).

Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.

Komatsu EG300BS-5(S/N 5001-UP) maintenance schedule

Service intervalTasks
Every 50 h
  • Check engine oil level and top up before start-up
  • Check coolant level in the radiator/header tank and inspect for external leaks
  • Drain water and sediment from the fuel tank and check the fuel level
  • Check battery charge condition and electrolyte level
  • Walk-round check for fuel, oil, and coolant leaks around the engine and base skid
  • Read control panel gauges and alarm lamps during a test start, and listen for abnormal engine or alternator noise
Every 250 h
  • Change engine oil and replace the oil filter cartridge
  • Check and adjust drive belt tension for the fan and charging alternator
  • Inspect and clean the air cleaner element and check the restriction indicator
  • Clean the fuel pre-filter/water separator element
  • Check mounting bolts on the engine, generator end, and base skid for looseness
  • Run the set under load briefly and confirm output voltage, frequency, and amperage are steady
Every 500 h
  • Replace the fuel filter cartridge
  • Inspect the turbocharger for shaft play, oil leakage, and inlet/outlet housing condition
  • Clean radiator and oil cooler fins of dust and debris buildup
  • Check exhaust piping, flexible connector, and muffler for leaks or cracking
  • Check insulation resistance of the generator windings with a megger
  • Inspect vibration isolators/mounts between the engine-generator skid and base for wear or cracking
Every 1,000 h
  • Replace the air cleaner element
  • Check and adjust valve clearance on the S6D140-1 cylinder head
  • Inspect fuel injection nozzles for spray pattern and drip, and send for calibration if needed
  • Check charging alternator and starter motor for wear and secure connections
  • Inspect and tighten all control panel wiring terminals and battery cable connections
  • Perform a full load-bank test and record voltage, frequency, and temperature readings
Every 2,000 h
  • Replace engine coolant and flush the cooling system
  • Check fuel injection pump timing and governor linkage adjustment
  • Inspect turbocharger bearings and wastegate/actuator operation more closely
  • Check alternator end bearings, brushes, and slip rings (where fitted) for wear
  • Re-torque enclosure, base skid, and anti-vibration mount fasteners
  • Verify automatic voltage regulator (AVR) and protective relay settings against the control panel nameplate
Every 5,000 h
  • Perform a top-end overhaul: valve grinding/seat replacement and injector nozzle replacement or recalibration as needed
  • Rebuild or replace the turbocharger cartridge
  • Inspect and recondition the fuel injection pump
  • Inspect cylinder liner wear and piston ring condition through the inspection ports where accessible
  • Service or rebuild the generator end bearings and check winding insulation resistance again against baseline readings
Every 10,000 h
  • Carry out a full in-frame or major overhaul of the S6D140-1 block: pistons, liners, main and rod bearings, and crankshaft inspection
  • Overhaul the alternator end completely, including rewinding assessment if insulation has degraded
  • Replace all rubber vibration isolators and inspect the base skid frame for fatigue cracking
  • Recondition or replace the control panel and protective relays if original components are obsolete or unreliable

Servicing the EG300BS-5(S/N 5001-UP) beyond the schedule

Predictive Maintenance & Fluid Analysis

The S6D140-1 has no ECM, so there are no fault codes to lean on. Track engine health through scheduled oil sampling for wear metals and fuel dilution, coolant testing for corrosion inhibitor depletion, and fuel cleanliness checks ahead of the mechanical injection pump. Megger the alternator windings on a regular cycle to catch insulation degradation before a winding failure. Watch exhaust smoke color and vibration at the base skid as early mechanical-wear indicators on this genset.

Corrective & Common Repairs

Typical failures on this set trace to the mechanical inline injection pump drifting out of calibration or timing, turbocharger bearing wear from standby-duty start/stop cycling, and radiator or aftercooler fins clogging in dusty environments common to job-site power. AVR and control-panel faults, weak starting/charging batteries after idle periods, and belt or vibration-isolator wear from a set that sits unused between runs round out the common repair list for the EG300BS-5.

Overhaul & Rebuild Points

Top-end overhaul on the S6D140-1 covers valve grinding, seat replacement, and injector nozzle recalibration or replacement, plus a turbocharger cartridge rebuild. A full in-frame overhaul addresses piston, liner, and main/rod bearing wear with a crankshaft inspection. On the generator end, plan for bearing replacement and brush/slip-ring service where fitted, with winding insulation checked against baseline before returning the set to service after any major rebuild.

Seasonal & Environment Servicing

As a bonnet-and-soundproof stationary set, cold-climate readiness means confirming block/coolant heater operation and battery capacity before winter standby duty. Drain fuel-system condensate more often after long idle stretches, since standby gensets accumulate water in the tank between runs. In hot, dusty sites, clean the soundproof enclosure's intake and exhaust louvers regularly to prevent heat buildup around the engine and alternator, and check the base skid for corrosion in coastal or high-humidity installations.

EG300BS-5(S/N 5001-UP) common service parts

Part numberPart
(600-311-7130)Cartridge,Fuel FilterCheck fitment →
09019-08035Wrench,Filter (For Add. Fuel Filter)Check fitment →
07281-00197Clamp,(With Pre-Fuel Filter)Check fitment →
(6128-81-7051)Element Ass'Y,Air CleanerCheck fitment →
09637-30161Plate? Instruction,Air Cleaner (Single Element)Check fitment →

Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.

EG300BS-5(S/N 5001-UP) fault codes & troubleshooting

CodeMeaningLikely causeWhat to do
OVERSPEED (O/S) SHUTDOWNEngine speed exceeded the safe governed limit and the set tripped off-line.Governor linkage sticking, worn flyweight assembly, or a load-rejection transient on the mechanical inline injection pump governor.Stop the set, inspect governor linkage for binding, check governor oil level and linkage travel, then restart and watch idle/rated speed before reloading.
LOW OIL PRESSURE SHUTDOWNLube oil pressure fell below the protective trip point and the engine was shut down automatically.Low crankcase oil level, clogged oil filter/strainer, worn oil pump, or a failed oil pressure sender/switch.Check oil level and condition first, then verify sender/switch operation with a mechanical gauge before returning the set to service.
HIGH COOLANT TEMPERATURE SHUTDOWNJacket water temperature exceeded the allowable limit and tripped the protective shutdown.Low coolant level, blocked radiator core, slipping or damaged fan belt, faulty thermostat, or restricted airflow around the enclosure.Check coolant level and radiator/core for debris, inspect belts and thermostat, then confirm the temperature sender reading against a manual gauge.
OVERCRANK / FAIL TO STARTThe starter cycled through its cranking attempts without the engine reaching a sustained run condition.Fuel delivery problem (air in lines, clogged filter, empty day tank), weak battery/starter, or a stuck fuel shutoff (stop) solenoid.Bleed the fuel system, confirm the stop solenoid pulls in and holds, and load-test the starting battery before another crank attempt.
LOW BATTERY VOLTAGE / CHARGE FAILStarting battery voltage or charging alternator output dropped below the acceptable range.Weak or sulfated battery, loose/corroded battery terminals, or a failed charging alternator/regulator.Load-test the battery, clean and tighten terminals, and check charging alternator output at rated engine speed.
EMERGENCY STOP ACTIVATEDThe manual emergency-stop pushbutton was engaged, immediately shutting down the set.Operator-initiated stop, or the button was bumped/left latched from a prior event.Confirm the cause of the stop, reset the emergency-stop button per its release procedure, then restart normally.
LOW FUEL LEVEL WARNINGFuel level in the day tank or base tank dropped to the low-level warning point.Tank running down during extended unattended operation, or a fuel leak/low supply from the main tank.Refuel and check for leaks in the fuel supply line and tank fittings; verify the fuel level sender if the warning persists after refueling.
AVR / VOLTAGE OUT-OF-RANGE ALARMGenerator output voltage drifted outside the normal regulation band.Faulty automatic voltage regulator (AVR), worn brushes/slip rings (brush-type units), or a loose sensing/excitation wiring connection.Check AVR wiring and connections, inspect brushes/slip rings if fitted, and verify output voltage against the rated nameplate value with the set unloaded then loaded.

Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.

EG300BS-5(S/N 5001-UP) attachments & work tools

Machine type note

The EG300BS-5 is a diesel engine-driven generator set (skid genset), not an excavator or loader. It carries no bucket, blade, or hydraulic work-tool coupler, so the usual dig/lift/grade attachment families do not apply to this model.

Enclosure configuration

Within the EG300 family the suffix marks the enclosure level: base EG300-5 is open/skid type, EG300B-5 adds a weatherproof bonnet housing, and this EG300BS-5 adds acoustic (soundproof) treatment on top of the bonnet housing. Other displacement siblings in the same range also offer a further BST trailer-mounted variant, though a BST version of the 300 size is not separately confirmed.

Base/mounting

Stationary bonnet/soundproof units of this class sit on a fabricated skid base frame rather than a wheeled chassis. A road-towable trailer chassis is a separate factory configuration reserved for the BST-suffix siblings in the wider EG lineup, not standard on the BS enclosure.

Generator/alternator type

Komatsu's factory shop literature for this EG range classes the generator end under brushless or self-excited compound generator types depending on output size; the exact classification specific to the 300-class rating is not separately broken out in available sources, so treat as brushless-type consistent with mid/large units in the family.

Control and monitoring panel

Units in this class ship with an integrated engine-generator control panel metering line voltage, current, frequency, kVA/kW output and power factor, with fault/shutdown indication. A panel spec sheet specific to the EG300BS-5 serial range was not located; treat wiring/metering detail as varies by configuration and verify against the nameplate or dealer documentation.

Guarding and options

The bonnet-and-soundproof housing itself functions as the weather and noise guarding option on this model, enclosing the S6D140-1 engine and generator end. No hydraulic-kit or quick-coupler provisions are documented, consistent with this being a self-contained power unit rather than an attachment-driving machine.

All EG300BS-5(S/N 5001-UP) assemblies by section

Every catalogued assembly group for the Komatsu EG300BS-5(S/N 5001-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Generator
Komatsu : Eg300bs-5(S/N 5001-Up) : Generator : Battery Ass'Y
DY***14Cap,Terminal1
DY***04Cable,Battery1
DY***04Cap,Terminal1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Generator : Bonnet Ass'Y (1/2)
DY***00Washer,Spring6
DY***04Lining1
DY***04Handle,Door7
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Komatsu : Eg300bs-5(S/N 5001-Up) : Generator : Bonnet Ass'Y (2/2)
DY***40Seal,Rubber2
DY***20Seal,Rubber3
DY***60Seal,Rubber1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Generator : Control Box Ass'Y
DY***10Switch,Panel Light1
DY***16Screw6
DY***00Nut4
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Komatsu : Eg300bs-5(S/N 5001-Up) : Generator : Engine Operating Panel Ass'Y
DY***04Rod,Governor1
DY***06Unit,Water Temperature2
DY***00Washer6
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Komatsu : Eg300bs-5(S/N 5001-Up) : Generator : Fuel Tank Ass'Y
DY***90Hose,Suction1
DY***04Pad,Tank Band4
DY***14Band,Hose4
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Komatsu : Eg300bs-5(S/N 5001-Up) : Generator : Generator Ass'Y
DY***00Washer,Spring6
DY***45Bolt8
DY***02Fan1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Generator : Muffler Ass'Y
DY***00Washer12
DY***00Washer10
DY***00Washer,Spring8
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Komatsu : Eg300bs-5(S/N 5001-Up) : Generator : Oil Pump Ass'Y
Komatsu : Eg300bs-5(S/N 5001-Up) : Generator : Radiator Ass'Y
DY***03Foot,Engine2
DY***03Tank,Reserve1
DY***00Washer12
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S6d140-1m Engine S/N 13869-Up
Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Air Cleaner (Except Japan)
01***30Bolt,(For France Noise Suppression)2
01***40Bolt,(Dust And Dirt Protection)2
01***25Bolt - Rear Guard Mounting4
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Air Intake Manifold And Connection
01***10Bolt,(With Auto Emergency Steering)2
01***16Bolt, Battery To Frame Ground Wire Attaching1
01***25Bolt,(For Canvas Canopy?Head Guard)2
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Alternator (25a)
60***90Alternator A. (25a)1
KD***57Bearing,Ball? Front1
KD***80Collar1
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Alternator And Mounting
01***20Bolt,(With Auto Emergency Steering)3
01***00Bolt, Mount Back-Up Alarm1
01***30Bolt1
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Camshaft
04***25Key, Plain Woodruff1
04***12Ring, Retaining24
61***20Ball1
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Cooling Fan And Tension Pulley
01***16Bolt,(For Slag Handling)6
01***85Bolt, Mount Solenoid Valve Body6
01***50Bolt - Torque Converter Totransmission Mounting3
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Corrosion Resistor And Piping
01***20Bolt,(For Quick Shift) (Mitsubishi)2
01***25Bolt,(For Canvas Canopy?Head Guard)4
01***40Bolt, Mount Master Brake Cylinder2
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Crankshaft
01***30Bolt,(Not Used With Emergency Str.)6
01***23Washer,(With Car Heater)6
01***32Washer,(Not Used With Emergency Str.)6
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Cylinder Block
01***25Bolt,(For Canvas Canopy?Head Guard)7
01***25Bolt,(Without Rops Guard? Canopy)2
01***16Washer,(With Water Separator)6
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Cylinder Block Cover
01***30Bolt,(For Quick Shift) (Mitsubishi)5
01***70Bolt, Mount Bracket And Oil Inlet Tube, Bolt1
01***25Bolt,(Without Rops Guard? Canopy)2
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Cylinder Head
04***20Pin,Dowel (Welded)2
07***25O-Ring,Lubrication Valve1
07***08Plug (Kit)1
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Exhaust Manifold And Turbocharger
01***45Bolt,(For Suction? Reversible Fan)4
01***55Screw2
01***00Bolt22
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Flywheel And Flywheel Housing
01***55Bolt,(For Long Track)8
01***45Bolt,(For Travel Motor) (Not Show)8
01***45Washer,(For Travel Motor) (Not Show)8
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Front Cover
01***10Bolt,(With Auto Emergency Steering)2
01***16Bolt, Mount Washer Tank To Bracket, Bolt2
01***20Bolt,(For Quick Shift) (Mitsubishi)5
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Fuel Filter And Piping
01***35Bolt,(For Quick Shift) (Mitsubishi)1
01***75Bolt,(For Adjusting)1
01***10Bolt, Fan Mounting2
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Fuel Injection Pump (Coupling)
DK***00Coupling,Cross1
DK***00Nut2
DK***00Bolt1
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Fuel Injection Pump (Feed Pump)
DK***20Bolt, Joint1
DK***00Valve,Check2
DK***20Tappet1
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Fuel Injection Pump (Governor) (1/2)
DK***00Gear1
DK***20Flyweight Ass'Y1
DK***00Connector1
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Fuel Injection Pump (Governor) (2/2)
DK***00Bushing1
DK***40Gasket,Air Compressor2
DK***00Nut,Cap1
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Fuel Injection Pump (Pump)
62***60Injection Pump Ass'Y1
DK***30Bearing,Roller2
DK***00Coupling1
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Fuel Injection Pump And Piping
01***16Bolt,(For Slag Handling)3
01***25Bolt,(For Automatic)4
01***35Bolt4
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Fuel Nozzle And Spill Pipe
01***20Bolt, Mount Main Relief Valve6
01***10Nut,(Service Only)1
07***21O-Ring,Oil Cooler Pipe12
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Gasket Kit
02***37O-Ring,(For Pc750?1800) (A5010)2
02***75O-Ring,(For Japan) (K1)4
02***81O-Ring,Air Connector2
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Heater Signal And Switch
08***20Connector1
08***00Horn Switch,Ether Starting1
60***52Relay,Emergency1
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Idler Gear
01***30Bolt,(Cold Terrain Spec.)6
01***80Bolt1
01***45Washer,(Without R.O.P.S.)1
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Lubricating Oil Cooler
01***25Bolt,Without Revolution Sensor2
01***30Bolt,(For Quick Shift) (Mitsubishi)13
01***35Bolt,(For Quick Shift) (Mitsubishi)3
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Lubricating Oil Filter
01***16Bolt,(For Slag Handling)3
01***30Bolt,(For Quick Shift) (Mitsubishi)3
01***60Bolt, Mount Tube To Switch Pump5
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Lubricating Oil Pump And Suction Pipe
01***25Bolt,(Without Auto Priming System)4
01***20Bolt,(Large Capacity Type) (Std)2
01***25Bolt,(Sandy? Dusty Terrain Spec.)2
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Marks And Plates (Except Japan)
09***03Plate? Instruction,Radiator Water Level1
09***00Plate? Safety,Cap Of Radiator Tank1
09***00Plate? Mark,Komatsu2
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Oil Pan
01***25Bolt,(For Canvas Canopy?Head Guard)12
01***30Bolt,(For Quick Shift) (Mitsubishi)26
01***16Washer,Radio Controlled Slag Handling38
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Piston And Connecting Rod
02***13Pin, Dowel2
04***20Ring, Retaining12
62***40Metal Ass'Y6
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Radiator And Piping
01***20Bolt,(Large Capacity Type) (Std)2
01***08Nut, Regular Hexagon (M10-1.50)2
01***30Washer,Spring(Sandy?Dusty Terrain S.)2
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Rocker Arm And Housing
01***08Nut,R.H. Thread12
01***32Washer, (Without Emergency Steering)16
01***32Washer, (Without Emergency Steering)6
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Rocker Arm Housing Cover
01***65Bolt,R.H18
62***10Cover,Rocker Arm Housing6
62***20Washer18
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Solenoid And Mounting
01***12Bolt,(Without R.P.C.U.)4
01***30Bolt,(For France Noise Suppression)2
01***35Bolt, Mounting - Flywheel Housing End2
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Starting Motor (7.5kw)
60***30Starting Motor Ass'Y,(7.5kw)1
KD***60Shift Lever Assembly1
KD***40Spring,Spring4
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Starting Motor And Mounting
01***40Bolt,(For Center Guard)3
66***10Gasket,Starting Motor1
(6***0)Starting Motor Ass'Y,(7.5kw) (See Fig.0661a)1
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Tool
09***06Wrench Set,8x10? 12x14? 13x17?1
09***35Wrench,Filter (For Add. Fuel Filter)1
09***90Driver,Screw (+)1
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Turbocharger (Except Japan)
01***16Bolt,(For Slag Handling)4
01***16Bolt8
04***08Pin, Dowel1
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Turbocharger Lubricating Oil Piping
01***25Bolt,(For Canvas Canopy?Head Guard)2
01***35Bolt,(For Quick Shift) (Mitsubishi)1
01***16Washer,Radio Controlled Slag Handling1
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Komatsu : Eg300bs-5(S/N 5001-Up) : S6d140-1m Engine S/N 13869-Up : Water Pump
01***20Bolt,(Sandy? Dusty Terrain Spec.)6
01***20Bolt,(Large Capacity Type) (Std)3
01***30Bolt,(For France Noise Suppression)2
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Sa6d125e-2gd-W7 Engine S/N 65905-Up
Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : After Cooler Water Piping
01***16Bolt, Battery To Frame Ground Wire Attaching2
01***20Bolt,(For Mono Lever Steering)1
01***25Bolt,(For Canvas Canopy?Head Guard)1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Air Cleaner (Double Element) (Electrical Indicator Spec.)(#72540-)
01***25Bolt,(For Canvas Canopy?Head Guard)2
01***30Bolt,(Not Used When Towing Winch)4
01***40Capscrew2
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Air Intake Manifold And After Cooler
01***35Bolt,(F4320-52a0 -5 )3
01***50Bolt,(Spark Arrester Spec.)18
01***75Bolt (M10-1.50x75)3
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Air Vent(#75210-)
07***12Gasket,(Without Air Compressor Type) (K2)12
07***10Screw, Banjo Connector (M10-1.25x20)6
61***60Tube,Air Vent1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Alternator (35a) (Inner Parts)
60***51Alternator A. (35a)1
KD***70Bushing,Insulate1
KD***40Bushing,Insulate1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Alternator Mounting (35a)
01***90Capscrew1
01***25Bolt2
01***35Bolt1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Camfollower Cover
61***90O-Ring,Breather1
61***10Cap, Oil Filler1
61***91Packing,(See Fig.A2060)9
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Camshaft(#76899-)
01***22Capscrew2
04***25Key, Plain Woodruff1
04***12Ring,Snap (For Ripper)12
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Cooling Fan
01***30Bolt,(With Body Positioner)6
01***40Bolt (Op)6
60***01Fan,Cooling1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Corrosion Resistor
01***16Bolt, Battery To Frame Ground Wire Attaching1
01***25Bolt,(For Canvas Canopy?Head Guard)4
02***25Bolt,(Cold Weather Spec.)4
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Crank Pulley
01***10Bolt1
01***15Bolt5
61***61Washer, Plain (14mm)1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Crankshaft
61***10Bearing, Main (Standard)7
61***50Bearing, Thrust Assembly (Standard)1
61***10Bearing, Main (1.00mm Undersize)7
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Cylinder Block Blind Cover And Plug(#76899-)
01***20Bolt,(For Mono Lever Steering)4
07***10Sleeve3
07***16Plug,(S6d155-4b)1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Cylinder Block(#76899-)
01***12Bolt,(Without Air Compressor Type)2
01***20Bolt,(For Shipping)1
01***16Bolt, Mount Solenoid Valve6
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Cylinder Head(#68141-)
01***20Bolt (M10-1.75x120)6
04***20Pin,Dowel (Welded)2
07***08Plug,(Without Lock-Up), Plug1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Damper
01***25Bolt,(Without Rops Guard? Canopy)6
04***28Pin, Dowel - Transmission Case, Pin-Dowel1
61***00Damper Ass'Y1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Emergency Switch And Relay
08***00Horn Switch,Ether Starting1
60***52Relay,Emergency1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Engine Mounting (Front Support) (Bridge Type)
01***55Bolt,(See Service News)2
01***05Capscrew4
01***10Bolt,(With Joy Stick Steering)2
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Exhaust Elbow
01***50Bolt7
01***40Bolt6
07***08Plug,(Without Auto Priming System)1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Exhaust Manifold
01***80Screw2
01***00Screw16
07***08Plug,(Without Auto Priming System)1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Exhaust Related Parts (Gasket)
61***51Gasket (K1)1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Fan Drive
01***30Bolt,(With Body Positioner)4
01***45Bolt,(With Water Separator Type)2
01***95Capscrew2
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Fan Pulley
04***62V-Belt Set,(For 35a? 50a Alternator)1
61***10Pulley?Non Hardening1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Flywheel (With Pilot Bearing)
06***09Bearing1
61***90Flywheel Ass'Y1
62***50Bolt6
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Flywheel Housing(#65905-81965)
01***55Bolt,(For Long Track)6
01***60Bolt, Hanger Bearing Mounting2
01***45Bolt,(With Water Separator Type)2
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Flywheel Housing(#81966-)
01***55Bolt,(For Long Track)6
01***60Bolt, Hanger Bearing Mounting2
01***55Bolt,(Not Used For Chip Dozer)6
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Front Cover Mounting Parts(#76899-)
01***65Bolt - Return Line And Suction Linehose Clamps7
01***75Bolt (M10-1.50x75)2
09***50Liquid Gasket, Lg-7, 150g0
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Front Cover(#76899-)
09***50Liquid Gasket, Lg-7, 150g0
61***30Seal? Front (K2)1
61***40Cover, Front1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Fuel Filter
01***25Capscrew1
01***90Capscrew2
01***16Washer,Radio Controlled Slag Handling2
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Fuel Injection Nozzle(#65905-84340)
01***45Bolt, Mount Divider Valve12
07***65O-Ring,Cylinder Block6
07***12Gasket,(Without Air Compressor Type) (K2)12
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Fuel Injection Nozzle(#84341-)
01***45Bolt, Mount Divider Valve12
07***65O-Ring,Cylinder Block6
07***12Gasket,(Without Air Compressor Type) (K2)12
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Fuel Injection Pump (Coupling) (Inner Parts)
DK***00Coupling,Cross1
DK***00Nut2
DK***00Bolt1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Fuel Injection Pump (Feed Pump) (Inner Parts)
DK***20Bolt, Joint1
DK***00Valve,Check2
DK***30Feed Pump Assembly1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Fuel Injection Pump (Governor) (1/2) (Inner Parts)
DK***00Gasket1
DK***00Screw1
DK***20Flyweight Ass'Y1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Fuel Injection Pump (Governor) (2/2) (Inner Parts)
DK***00Screw1
DK***00Gasket1
DK***00Nut,Cap1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Fuel Injection Pump (Pump) (1/2) (Inner Parts)
61***91Injection Pump A1
61***92Injection Pump A1
DK***30Bearing,Roller2
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Fuel Injection Pump (Pump) (2/2) (Inner Parts)
DK***00Shim? 0.875mm0
DK***00Shim? 0.500mm0
DK***00Shim? 1.575mm0
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Fuel Injection Pump Drive
01***25Bolt,(For Canvas Canopy?Head Guard)4
01***14Nut (Itl)1
01***60Washer,(Without Rops Guard? Canopy)1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Fuel Injection Pump Mounting
Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Fuel Injection Pump Piping(#74857-)
01***30Screw6
01***30Bolt,(With Body Positioner)4
01***45Bolt,(With Water Separator Type)2
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Fuel Return
01***25Bolt,(For Canvas Canopy?Head Guard)3
01***35Bolt,(F4320-52a0 -5 )1
01***80Bolt,(With Corrosion Resistor)1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Harness Connector And Terminal Cap
08***18Cap,Alternator4
08***30Cap,(For Relay)3
08***92Connector,(For Mechanical Governor)1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Head Cover
01***16Washer,Radio Controlled Slag Handling24
61***11Cover,Head? No.2?3?4?5?66
61***10Gasket,Cylinder Head Cover6
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Heater Signal
60***30Signal,Engine Pre Heater1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Heater Switch
Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Idler Gear
01***60Screw1
01***60Capscrew1
01***25Bolt,(For Canvas Canopy?Head Guard)6
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Marks And Plates(#85733-)
09***00Decal, "Komatsu" (Front Edge Of Decks)2
09***00Plate? Mark,Komatsu1
09***60Plate? Mark,Komatsu1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Name Plate And Caution Plate (English)(#85733-)
09***63Plate? Instruction,Air Cleaner (Single Element)1
09***03Plate? Instruction,Radiator Water Level1
09***00Plate? Safety,Cap Of Radiator Tank1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Name Plate And Caution Plate (French)(#85733-)
09***62Plate? Instruction,Air Cleaner (Double Element)1
09***04Plate? Instruction,Radiator Sub Tank Caution1
09***00Plate? Safety,Radiator Cap (French)1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Nozzle Holder (Inner Parts)(#65905-84340)
07***12Gasket,Mechanical Pump Piping2
61***52Bolt, Joint1
61***10Fuel Injector Assembly6
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Nozzle Holder (Inner Parts)(#84341-)
07***12Gasket,Mechanical Pump Piping2
61***52Bolt, Joint1
61***10Fuel Injector Assembly6
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Oil Cooler Mounting Parts(#76899-)
01***25Bolt,(For Canvas Canopy?Head Guard)12
01***65Bolt - Return Line And Suction Linehose Clamps2
01***80Bolt,(With Corrosion Resistor)2
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Oil Cooler(#76899-)
01***25Bolt - Relay Mounting2
07***42O-Ring,(See Fig.A3310)1
61***25Cover1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Oil Filter
01***60Bolt,(F4320-52a0 -5- )1
01***75Bolt (M10-1.50x75)4
01***80Bolt,(With Corrosion Resistor)2
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Oil Level Gauge
61***20Collar1
61***30Nut,(For Shipping)1
61***41Guide1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Oil Pan And Suction Tube
01***20Bolt,(For Mono Lever Steering)2
01***35Bolt,(F4320-52a0 -5 )1
01***40Bolt (Op)26
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Oil Pan Blind Cover And Plug
01***25Bolt,(For Canvas Canopy?Head Guard)2
07***15Plug1
28***70Plug,(For Shipping)2
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Oil Pressure Switch
07***08Plug3
60***70Switch,Oil Pressure1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Oil Pump
01***25Bolt,(Rear Attachment Less)4
01***25Bolt,(For Canvas Canopy?Head Guard)3
01***35Bolt,(F4320-52a0 -5 )1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Piston
02***13Pin, Dowel2
04***18Ring, Snap12
61***30Bushing,(Service Part)1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Radiator
07***11Hose, Muffler Drain1
07***97Clamp,(With Pre-Fuel Filter)2
07***09Clamp, Hose - At Water Pump6
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Rocker Arm(#76899-)
01***75Screw40
01***08Nut,R.H. Thread12
01***32Washer,(With Auto Emergency Steering)40
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Safety Guard (For Fuel Injection Pump Drive)
01***20Bolt,(For Mono Lever Steering)2
61***50Cover, Safety1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Solenoid (A-Contact Point Type)
01***20Bolt,(Without Air Con. Or Heater)2
01***25Capscrew1
01***40Bolt (Op)4
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Spare Parts
04***10Ring,See Fig. K4010-65a01
60***90Nut,Wing (K26)1
60***00Element Ass'Y,Outer1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Starting Motor (7.5kw) (Inner Parts)
60***11Starting Motor Ass'Y,(7.5kw)1
KD***60Shift Lever Assembly1
KD***40Spring,Spring4
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Starting Motor Mounting (7.5kw)
01***40Bolt,(With Center Guard)3
01***40Bolt (Kit)3
62***10Gasket,(See Fig.A6210)1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Starting Switch
60***90Switch,Starting1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Tachometer Drive
01***30Bolt1
01***16Washer,Radio Controlled Slag Handling1
07***20O-Ring,Relief Valve1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Tachometer Drive (Drive Gear)(#76899-)
61***31Gear,(With Air Compressor Type)1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Thermostat Housing
01***25Bolt,(For Canvas Canopy?Head Guard)2
01***65Screw4
02***04Plug,(For Shipping)1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Thermostat Housing Blind Plug
07***15Plug,(Used When Without Heater)1
28***70Plug,(For Shipping)1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Tool
09***06Wrench Set,8x10? 12x14? 13x17?1
09***10Wrench? 8x101
09***14Wrench? 12x141
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Turbochager (Inner Parts)
61***30Turbocharger Ass'Y1
SP***49V-Clamp1
SP***62Housing, Compressor1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Turbocharger Mounting And Lubricator
01***20Bolt, Wiring Harness Mounting Bracket2
01***30Bolt - M8 X 30lg2
01***16Bolt, Battery To Frame Ground Wire Attaching1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Water Drain
61***12Valve,Water Drain1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Water Piping Bracket (For Without Heat Shield)
01***20Bolt1
61***30Bracket1
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Water Pump(#75210-)
01***16Bolt - Seat And Tether Belt Mounting6
01***20Bolt,(For Mono Lever Steering)2
01***25Bolt,(For Canvas Canopy?Head Guard)2
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Komatsu : Eg300bs-5(S/N 5001-Up) : Sa6d125e-2gd-W7 Engine S/N 65905-Up : Water Temperature Switch
01***25Bolt,(For Canvas Canopy?Head Guard)4
07***15Plug,(B)1
28***70Plug,(For Shipping)1
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Frequently asked questions

What engine does the Komatsu EG300BS-5 (S/N 5001-UP) use?

A Komatsu S6D140-1 six-cylinder, water-cooled, turbocharged diesel engine with a mechanical inline fuel-injection pump and mechanical governor. It predates electronic engine control, so there is no ECM or fault-code diagnostics on this unit.

What is the operating weight of the EG300BS-5?

Not documented for this exact S/N 5001-UP range. Weight varies with the bonnet/soundproof enclosure, base skid, and voltage/frequency configuration fitted. Check the unit nameplate or confirm with your Komatsu dealer for the exact figure.

What replaced the Komatsu EG300BS-5?

No specific successor model is confirmed for this exact serial range. Komatsu's EG-series generator sets progressed to later generation numbers over time as engines moved toward electronic control; for a direct replacement recommendation, check current Komatsu generator set literature or ask your dealer.

What EG300BS-5(S/N 5001-UP) owners discuss

What engine does the EG300BS-5 (S/N 5001-UP) actually run, and is it the same block used in Komatsu excavators and loaders?
This set is built around the Komatsu S6D140-1, a water-cooled turbocharged inline-six diesel in the industrial/generator-drive configuration of the 6D140-1 family. It shares its core architecture with the 6D140-1 variants used in wheel loaders and other Komatsu iron, but the genset-spec engine is tuned and governed for constant-speed generator duty, not variable-speed machine duty. Don't pull injector, turbo, or governor parts or settings from an excavator/loader manual for this unit — use the EG-series engine-generator documentation. Owners report the block itself is a known, durable design; most complaints trace back to fuel quality, cooling airflow, or light-load operation rather than the engine casting itself.
The set runs fine but ours pulls light loads most of the time — is that a problem?
Yes, and it's the number-one complaint operators bring up for stationary diesel gensets in this power class. Sustained light-load running (well under roughly 30-40% of rated output) keeps cylinder pressure and exhaust temperature too low for complete combustion. Unburned fuel and carbon condense in the exhaust path, turbo, and injectors — "wet stacking" — showing up as black or oily residue at the exhaust outlet, sooty exhaust smoke, and gradual power loss. Field fix operators use: schedule periodic runs at 70-80% of rated load for a sustained period (commonly two hours or more) to burn off deposits, and avoid parking the set on standby idle for long stretches. If wet stacking has already set in and performance doesn't recover after a proper load run, have your dealer verify injector and turbo condition before returning the set to service.
What's the most common reason this class of Komatsu genset won't start or trips on shutdown?
Community consensus for diesel generator sets in this class is that most no-start or nuisance-shutdown complaints come back to the starting battery and charging circuit, not the engine. Weak or sulfated batteries, corroded terminals, and a failing battery charger account for the large majority of failed starts. After that, the next most common causes are air trapped in the fuel lines after a filter change, a clogged fuel or air filter, or the control panel reading a real low-oil-pressure or high-coolant-temp fault and correctly refusing to start or run. Clear the fault log on the control panel first and confirm it's a real sensor condition rather than a wiring or connector fault before chasing the engine. Because a shutdown fault can be protecting the engine from real damage, have your dealer verify before you bypass or reset any safety shutdown repeatedly.
Any known issues with the alternator (generator end) or voltage regulation on these brushless units?
The EG-series sets use a brushless self-excited generator end, which owners generally describe as low-maintenance compared with brush-type alternators — there are no brushes or slip rings to wear. The complaints that do come up center on the automatic voltage regulator (AVR): voltage that drifts or won't hold steady under load, or output that's present but won't build to rated voltage on startup, both usually trace to a degraded or misadjusted AVR rather than the windings themselves. Insulation resistance on the windings should still be checked periodically, especially on sets that have sat idle or been stored in a humid environment, since winding insulation is the failure mode that actually takes an alternator out of service.
The soundproof enclosure traps a lot of heat and moisture — is that normal for the BS bonnet/soundproof housing?
Yes, it's a known trade-off with bonnet-and-soundproof canopy designs like this one. The acoustic lining and tighter enclosure that cut noise also restrict airflow compared with an open-type set, so cooling margin is tighter and condensation inside the housing is more common, particularly in humid climates or with frequent start-stop cycling. Owners recommend checking that the enclosure's air inlet and outlet louvers are clear of debris and that the cooling fan shroud is properly sealed to the radiator, since airflow leaks around the shroud are a common cause of running hotter than expected in soundproof housings. Standing condensation inside the enclosure also accelerates corrosion on the control panel and wiring harnesses, so operators in humid or coastal locations report better outcomes running a panel space heater during idle periods.
What should I check before buying a used EG300BS-5 (S/N 5001-UP)?
Beyond the general condition items any diesel genset buyer checks (hour meter reading consistent with wear, engine oil and coolant condition, visible leaks at hoses and gaskets, corrosion inside the enclosure, and full maintenance/service records), focus on items specific to this class of stationary set. Ask whether the set was run mostly on standby/light load or on sustained prime-power duty — heavy light-load history raises the odds of wet-stacking damage to the turbo and injectors. Request a load bank test or at minimum a witnessed start-up and run under load, watching panel readings, exhaust smoke color, and how quickly voltage and frequency stabilize. Check the control panel's fault history/log if available rather than relying on a clean current display, since past nuisance trips or overheat events are often logged even after being cleared. Inspect the enclosure interior for condensation staining or corrosion on wiring and the AVR, and confirm the fuel tank/base tank shows no water contamination or internal rust. On any set this old, have your dealer verify engine hours against the fuel injection pump and turbo service intervals before you commit.

Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.

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