Komatsu 6D105-1BB(S/N 62390-UP)
Maintenance schedule, common problems & OEM parts breakdown
The 6D105-1BB is a specific factory build within Komatsu's 6D105-1 family of mechanical, jerk-pump-injected industrial diesel engines: an inline 6-cylinder unit with a 105 mm x 125 mm (4.13 in x 4.92 in) bore and stroke, roughly 6.49 liter displacement, direct injection, and no engine control module. It belongs to the Dash-1 generation of Komatsu's mechanical-engine era, and the S/N 62390-UP block is factory-documented against the WA200-1 wheel loader, a mid-size wheel loader in roughly the 9.5 to 9.7 tonne operating-weight class. Komatsu offered the 6D105-1 architecture across several parallel build codes (1F, 1L, 1M-A, 1M-AM, 1M-F, and 1M-P among them), each tied to its own serial range and host application, with the 1BB code representing the configuration and accessory rating built for this particular chassis and duty cycle.
Across the 6D105-1 lineup the core architecture stayed constant while accessory drives, injection calibration, and turbocharging carried the differences between build codes, and later Komatsu dash generations moved this same bore family toward turbocharged and eventually electronically governed variants. No factory record ties a direct one-model successor to this exact suffix and serial block, so continuity today runs through parts and rebuild support rather than a documented replacement engine. That is also where its market value sits: a simple, ECM-free mechanical diesel with well-understood wear points, injector seepage, cooling-system seal wear, and liner-driven oil consumption, is comparatively cheap to diagnose and rebuild in the field, which keeps 6D105-1BB units and cores in active demand among rebuilders and independent shops long after the host machine itself left production.
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 6D105-1BB(S/N 62390-UP) specifications
Engine
| Engine model | Komatsu 6D105-1 series, production build 6D105-1BB (applies from engine serial no. 62390 and up) |
| Configuration | Inline 6-cylinder, water-cooled diesel, direct injection |
| Displacement | 6.49 L (6,494 cc) |
| Bore x stroke | 105 mm x 125 mm |
| Aspiration | Naturally aspirated per the 6D105-1 base-series shop manual; not documented specifically for the 1BB production build — verify aspiration and turbo fitment against the host machine's own engine tag before ordering parts |
| Gross/net power | Not published for this specific serial-range build. Across 6D105-1-series installations in period Komatsu machines, rated flywheel output runs roughly 70-82 kW (95-110 PS/hp) depending on host machine and governed speed — varies by configuration/series |
| Emissions tier | None — mechanical, pre-emissions-regulation diesel (no ECM, no aftertreatment) |
Weights
| Operating/shipping weight | Not documented for the bare engine. As factory-fitted to its documented host, a wheel loader, the machine sits in roughly the 9.5 to 9.7 tonne operating-weight class, varying by bucket, counterweight, and configuration |
| Ground pressure | Not applicable — no ground-engaging chassis is defined for this engine record |
Dimensions
| Transport length/width/height | Not documented for this bare-engine serial-range build |
| Wheelbase / track gauge | Not applicable — no chassis is defined for this engine record |
| Ground clearance | Not documented |
Performance
| Travel speed | Not applicable — this record is a bare engine build/serial break, not a complete machine, so no travel-speed or drivetrain performance figures apply |
| Class performance (lift/dig/dump/drawbar) | Not applicable for a bare engine assembly |
| Gradeability | Not published |
Service capacities (summary)
| Engine oil capacity | About 24 L total pan capacity, about 23 L on a filter-change refill (6.3 US gal / 6.1 US gal), per the 6D105-1 series shop manual |
| Cooling system capacity | Not fixed for the bare engine — family shop data shows a wide 21 to 44 L (5.5 to 11.6 US gal) range depending on the host machine's radiator package; confirm against the host machine's own operation manual |
| Fuel tank capacity | Not applicable to a bare engine record — fuel tank sizing is set by the host machine, which is not confirmed for this exact serial range |
| Hydraulic system capacity | Not applicable — this is an engine, not a complete hydraulic machine |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
6D105-1BB(S/N 62390-UP) fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with oil filter) | About 24 L total pan capacity, about 23 L on a filter-change refill (6.3 US gal / 6.1 US gal) | Komatsu Genuine diesel engine oil (EO series). Same-family shop data calls for SAE 30 in normal ambient conditions and SAE 10W below 0°C (32°F) on this engine generation; current-issue Komatsu Genuine EO10W-30 covers roughly -30°C to 30°C and EO15W-40 suits warmer ranges. Use an oil meeting at minimum API CD/CE-class diesel engine oil performance. |
| Cooling system (radiator + block) | Not fixed for the bare engine — shop data for this 6D105-1 engine family shows a wide 21 to 44 L (5.5 to 11.6 US gal) range depending on the radiator/cooling package of the machine it is installed in; confirm against the actual host machine's OMM | Komatsu Genuine Super Coolant (AF-NAC), an ethylene-glycol, phosphate/OAT-type, factory pre-mixed (50/50) antifreeze-corrosion inhibitor coolant. Do not mix with silicate-type coolants. Change interval per Komatsu genuine coolant is 2 years or 4,000 service hours, whichever comes first. |
| Fuel system | Fuel tank capacity is set by the host machine and is not published for the bare 6D105-1BB engine | Diesel fuel to ASTM D975 No. 2-D for normal service; switch to No. 1-D (winter/cold grade) below 0°C (32°F) for reliable cold starting, per the shared 6D105-1 engine family fuel spec. |
| Grease points | Per fitting, no reservoir volume specified | Komatsu Genuine multipurpose lithium-base grease (G2-LI), NLGI No. 2 for normal ambient temperatures; switch to a softer NLGI No. 0/1 grade in sustained sub-freezing conditions. |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Komatsu 6D105-1BB(S/N 62390-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 6D105-1BB(S/N 62390-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
Because the 6D105-1BB carries no ECM, condition monitoring depends on manual sampling rather than fault codes. Pull an oil sample at each interval and watch for rising iron and chrome content, the early flag for the cylinder-liner wear this family is known for. Track fuel filter and injector seepage visually, since nozzle drip is the most common fuel-system failure mode. Test coolant concentration and inhibitor level rather than relying on visual clarity, particularly given the wide range of radiator packages fitted to its host.
Corrective & Common Repairs
Most corrective work on this engine centers on the fuel and cooling systems. Injector nozzles that seep at idle should be pulled, tested, and reseated rather than left to wash down cylinder walls. Water pump seal weeping and head gasket seepage are common cooling-system repairs at higher hours. Because injection timing and governor linkage are set mechanically, drivability complaints are traced with a timing light and linkage gauge, not a scan tool.
Overhaul & Rebuild Points
A full overhaul on the 6D105-1BB centers on the fuel-injection pump and the cylinder pack. Liner wear tracks directly to the oil-consumption complaints reported on this family, so bore and liner measurement is the first overhaul check, followed by ring and bearing clearances. The mechanical injection pump needs bench calibration and nozzle opening-pressure resets rather than software reflash. Valve seats and guides are reconditioned on the same schedule, since there is no electronic idle or fuel trim to mask a worn seat.
Seasonal & Environment Servicing
Cold starts on this mechanical engine rely on correct-viscosity oil, a sound battery, and a block heater or starting aid rather than any ECM-managed glow strategy, so pre-winter service should confirm all three. In hot or dusty operating environments, shorten the air-cleaner and fuel-filter service interval, since the jerk-pump fuel system is unforgiving of contamination reaching the plungers. Because coolant capacity depends on the host radiator package, always verify fill volume before topping up rather than assuming a family-wide figure.
6D105-1BB(S/N 62390-UP) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 07281-00197 | Clamp,(With Pre-Fuel Filter) | Fuel system service | Check fitment → |
| 600-311-9100 | Fuel Filter Ass'Y | Fuel system service | Check fitment → |
| 600-311-8221 | Cartridge,Engine Fuel Filter | Fuel system service | Check fitment → |
| 6136-71-6120 | Cartridge,Engine Fuel Filter | Fuel system service | Check fitment → |
| 6136-72-6100 | Fuel Filter Ass'Y | Fuel system service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
6D105-1BB(S/N 62390-UP) attachments & work tools
Host machine
6D105-1BB (S/N 62390-UP) is the factory-fit power unit for the Komatsu WA200-1 wheel loader production block beginning at this chassis serial. It is not documented as a standalone genset or industrial power-unit application for this serial range.
Bucket - general purpose
Standard work tool for this loader class is a general-purpose earthmoving bucket, around 1.7 m3 struck capacity, sized to the host loader's roughly 9.5-9.7 t operating weight. Bolt-on replaceable cutting edge is standard; bucket teeth are an added option, not standard fit.
Pallet forks
Fork/carriage attachments were offered for this loader size class for yard and material-handling duty, mounted on the same boom linkage as the bucket. Rated lift capacity follows the loader's static tipping load rating rather than a bucket-specific figure.
Work-tool mounting / coupler
This production block uses a direct pin-mounted bucket/fork linkage rather than a hydraulic quick-coupler tool carrier; swapping tools means pulling the linkage pins. Komatsu's later hydraulic quick-coupler tool-carrier arrangement for this loader class belongs to newer WA200 generations, not this serial range - verify tool-carrier fitment with your dealer before assuming compatibility.
Loader hydraulic implement pump
The engine drives the loader's boom-lift and bucket-tilt hydraulic pump directly off the flywheel/gear train. This engine-driven pump is the closest equivalent to a PTO on this engine, and it is dedicated to the machine's own work-equipment circuit rather than an auxiliary drive for separate implements.
Cooling package
Radiator and engine-driven cooling fan are packaged for a front-engine wheel-loader installation (fan draws air through the radiator ahead of the engine). Other host applications sharing the base 6D105 engine family use different fan shrouding and radiator arrangements, so cooling hardware is not interchangeable across hosts.
Charging / alternator
Engine carries a vehicle-duty alternator sized for the loader's lighting, instrumentation, and starting circuit. No dedicated generator-end or genset pairing is documented for this serial range.
Transmission pairing
Engine is matched to a torque-converter powershift transmission and loader-type axles typical of the WA200-1 class. This is a factory driveline configuration, not a bolt-on work tool, and is noted here as a factory arrangement rather than an attachment.
All 6D105-1BB(S/N 62390-UP) assemblies by section
Every catalogued assembly group for the Komatsu 6D105-1BB(S/N 62390-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Cooling System
Komatsu : 6d105-1bb(S/N 62390-Up) : Cooling System : Corrosion Resistor And Piping
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***29 | Washer,Spring (Cold Weather Spec.) | 4 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 4 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Cooling System : Water Pump And Cooling Fan
| 01***16 | Bolt,(For Slag Handling) | 2 |
| 01***30 | Bolt,(Cold Terrain Spec.) | 3 |
| 01***55 | Bolt,(For Suction? Reversible Fan) | 2 |
Cylinder Block
Komatsu : 6d105-1bb(S/N 62390-Up) : Cylinder Block : Camshaft And Tappet
| 01***25 | Bolt,(Without Auto Priming System) | 2 |
| 01***25 | Washer,Spring?(Sandy And Dusty Spec.) | 2 |
| 01***16 | Washer,(For 35a Alternator) | 2 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Cylinder Block : Crankshaft
| 01***25 | Bolt - Rear Guard Mounting | 6 |
| 01***45 | Bolt,Nylock | 1 |
| 01***36 | Washer,Radio Controlled Slag Handling | 6 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Cylinder Block : Crankshaft (With Air Conditioner)
| 01***70 | Bolt, Heater Hose Clip | 6 |
| 01***45 | Bolt | 1 |
| 01***36 | Washer,Radio Controlled Slag Handling | 6 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Cylinder Block : Cylinder Block (With Turbocharger)(#86387-)
| 01***30 | Bolt,(For France Noise Suppression) | 3 |
| 01***45 | Bolt,(For Suction? Reversible Fan) | 1 |
| 01***20 | Bolt,(Used When Towing Winch) | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Cylinder Block : Cylinder Block(#86387-)
| 01***30 | Bolt,(For France Noise Suppression) | 4 |
| 01***20 | Bolt,(Used When Towing Winch) | 1 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 4 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Cylinder Block : Flywheel And Flywheel Housing (Key Stop Type)(#86387-)
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 2 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 9 |
| 01***45 | Bolt,(Cold Terrain Spec.) | 2 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Cylinder Block : Flywheel And Flywheel Housing (Pedal Stop Type)(#86387-)
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 2 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 9 |
| 01***45 | Bolt,(Cold Terrain Spec.) | 2 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Cylinder Block : Front Cover And Gear
| 01***22 | Bolt,(Cold Terrain Spec.) | 4 |
| 01***25 | Bolt,(Without Auto Priming System) | 4 |
| 01***60 | Bolt,(Without Alternator Bracket) | 10 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Cylinder Block : Oil Pan
| 01***22 | Bolt,(Cold Terrain Spec.) | 29 |
| 01***25 | Bolt,(Without Auto Priming System) | 8 |
| 01***30 | Bolt,(Cold Terrain Spec.) | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Cylinder Block : Oil Pan (With Oil Level Sensor)
| 01***22 | Bolt,(Cold Terrain Spec.) | 29 |
| 01***25 | Bolt,(Without Auto Priming System) | 8 |
| 01***30 | Bolt,(Cold Terrain Spec.) | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Cylinder Block : Oil Pan (Without Oil Level Sensor)(#86387-)
| 01***22 | Bolt,(Cold Terrain Spec.) | 29 |
| 01***30 | Bolt,(Cold Terrain Spec.) | 1 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 8 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Cylinder Block : Piston And Connecting Rod
| 04***18 | Ring, Retaining | 2 |
| 61***30 | Piston Ring Ass'Y | 6 |
| 61***10 | Pin,Piston | 1 |
Cylinder Head
Komatsu : 6d105-1bb(S/N 62390-Up) : Cylinder Head : Air Cleaner And Mounting (Tunnel Spec.)(#86387-)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***25 | Bolt (M10x1.50x25) | 2 |
| 01***45 | Screw | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Cylinder Head : Air Cleaner And Mounting (With Turbocharger)(#86387-)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***25 | Bolt (M10x1.50x25) | 2 |
| 01***08 | Nut,R.H. Thread | 6 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Cylinder Head : Air Cleaner And Mounting(#86387-)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***25 | Bolt (M10x1.50x25) | 2 |
| 01***45 | Screw | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Cylinder Head : Air Intake Manifold And Connection (With Turbocharger)
| 01***20 | Bolt | 2 |
| 01***50 | Bolt,(For Trimming Dozer) | 2 |
| 01***65 | Bolt,(For Alternator Bracket Mount) | 5 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Cylinder Head : Air Intake Manifold And Connection(#78380-)
| 01***20 | Bolt | 2 |
| 01***50 | Bolt,(For Trimming Dozer) | 2 |
| 01***65 | Bolt,(For Alternator Bracket Mount) | 5 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Cylinder Head : Cylinder Head (With Turbocharger)
| 01***30 | Bolt,(For France Noise Suppression) | 2 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 2 |
| 01***16 | Washer,(With Shoe Slip Control) | 2 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Cylinder Head : Cylinder Head Cover(#79183-)
| 07***23 | Clamp - Hose | 1 |
| 07***00 | Clip | 1 |
| 07***30 | Clip | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Cylinder Head : Cylinder Head(#86387-)
| 01***30 | Bolt,(For France Noise Suppression) | 2 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 2 |
| 01***16 | Washer,(With Shoe Slip Control) | 2 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Cylinder Head : Exhaust Manifold And Mounting
| 01***60 | Bolt (M10-1.50x60) | 1 |
| 01***00 | Bolt (M10-1.50x100) | 11 |
| 61***60 | Spacer | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Cylinder Head : Exhaust Manifold And Turbocharger (With Turbocharger)
| 01***60 | Bolt (M10-1.50x60) | 1 |
| 01***00 | Bolt (M10-1.50x100) | 11 |
| 01***32 | Washer,(With Auto Emergency Steering) | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Cylinder Head : Muffler And Mounting
| 01***20 | Bolt,(Large Capacity Type) (Std) | 2 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***11 | Nut (M14-1.50 Thd), Nut; Was 01582-01411 | 2 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Cylinder Head : Muffler And Mounting (With Turbocharger)
| 01***40 | Bolt,(Dust And Dirt Protection) | 4 |
| 01***45 | Bolt,(For Suction? Reversible Fan) | 4 |
| 01***95 | Bolt,(For Reversible Fan) | 2 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Cylinder Head : Muffler And Mounting(#75963-)
| 01***20 | Bolt,(Large Capacity Type) (Std) | 2 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***16 | Bolt | 4 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Cylinder Head : Muffler And Mounting(#86387-)
| 01***20 | Bolt,(Large Capacity Type) (Std) | 2 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***16 | Bolt | 4 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Cylinder Head : Rocker Arm
| 01***80 | Bolt,(Shim 5 Pieces Over) | 2 |
| 01***06 | Nut, Regular Hexagon (M8-1.25) | 12 |
| 01***36 | Washer,Radio Controlled Slag Handling | 6 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Cylinder Head : Turbocharger
| 61***00 | Turbocharger Ass'Y | 1 |
| GA***00 | Clamp | 3 |
| GA***01 | Bolt | 6 |
Electrical System
Komatsu : 6d105-1bb(S/N 62390-Up) : Electrical System : Alternator (25a) (With Non Hardening Pulley)
| 60***20 | Alternator A. (25a),(With Non Hardening Pulley) | 1 |
| KD***57 | Bearing,Ball? Front | 1 |
| KD***80 | Collar | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Electrical System : Alternator (35a) (Drip-Proof Type) (With Non Hardening Pulley)
| 60***60 | Alternator A. (35a),(With Non Hardening Pulley) | 1 |
| KD***31 | Bushing,Insulator | 2 |
| KD***57 | Bearing,Ball? Front | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Electrical System : Alternator (35a) (With Hardening Pulley)
| 60***20 | Alternator A. (35a),(With Hardening Pulley) | 1 |
| KD***57 | Bearing,Ball? Front | 1 |
| KD***80 | Collar | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Electrical System : Alternator (35a) (With Non Hardening Pulley)(#70635-)
| 60***80 | Alternator A. (35a),(With Non Hardening Pulley) | 1 |
| KD***57 | Bearing,Ball? Front | 1 |
| KD***80 | Collar | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Electrical System : Alternator (50a) (With Hardening Pulley)
| 60***90 | Alternator A. (50a),(With Hardening Pulley) | 1 |
| SD***X0 | Washer | 1 |
| SD***X0 | Fan | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Electrical System : Alternator (50a) (With Non Hardening Pulley)(#62390-70634)
| 60***40 | Alternator A. (50a),(With Non Hardening Pulley) | 1 |
| SD***X0 | Coil Assembly | 1 |
| SD***X0 | Washer | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Electrical System : Alternator (50a) (With Non Hardening Pulley)(#86387-)
| 60***90 | Alternator A. (50a),(With Non Hardening Pulley) | 1 |
| SD***X0 | Washer | 1 |
| SD***X0 | Fan | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Electrical System : Alternator (75a) (With Non Hardening Pulley)(#70635-)
| 60***40 | Alternator A. (75a),(With Non Hardening Pulley) | 1 |
| SD***X0 | Coil Assembly | 1 |
| SD***X0 | Bracket, Rear | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Electrical System : Alternator And Mounting (25a) (Alternator With Non Hardening Pu- Lley) (Bracket Less Type)(#93942-)
| 01***45 | Bolt,(For Suction? Reversible Fan) | 1 |
| 01***35 | Bolt,(Cold Weather Spec.) | 1 |
| 01***10 | Nut,(Dust?Drip Proof? Trimming S.) | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Electrical System : Alternator And Mounting (25a) (Alternator With Non Hardening Pu- Lley) (Bracket Mounting Type)(#62390-93941)
| 01***65 | Bolt,(For Alternator Bracket Mount) | 2 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***70 | Bolt,(With Wear Guard) | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Electrical System : Alternator And Mounting (35a) (Bracket Less Type)(#93942-)
| 01***45 | Bolt,(For Suction? Reversible Fan) | 1 |
| 01***35 | Bolt,(Cold Weather Spec.) | 1 |
| 01***10 | Nut,(Dust?Drip Proof? Trimming S.) | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Electrical System : Alternator And Mounting (35a) (With Non Hardening Pulley) (Drip- Proof Type) (Bracket Mounting Type)
| 01***65 | Bolt,(For Alternator Bracket Mount) | 2 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***70 | Bolt,(With Wear Guard) | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Electrical System : Alternator And Mounting (50a) (Bracket Mounting Type)(#86387-)
| 01***65 | Bolt,(For Alternator Bracket Mount) | 2 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 1 |
| 01***70 | Bolt,(With Wear Guard) | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Electrical System : Alternator And Mounting (50a? 35a) (Alternator With Non Hardenongpulley)(#62390-93941)
| 01***65 | Bolt,(For Alternator Bracket Mount) | 2 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***70 | Bolt,(With Wear Guard) | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Electrical System : Alternator And Mounting (75a) (With Non Hardening Pulley) (Bracket Mounting Type)(#70635-)
| 01***65 | Bolt,(For Alternator Bracket Mount) | 2 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***70 | Bolt,(With Wear Guard) | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Electrical System : Heater Switch And Heater Signal(#75963-)
| 60***71 | Signal,Signal | 1 |
| (6***0) | Switch,Heater (See Fig.0131 Or 0131a) | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Electrical System : Starting Motor (5.5kw)
| 60***90 | Starting Motor Ass'Y,(5.5kw) | 1 |
| KD***30 | Bracket,Center | 1 |
| KD***50 | Clutch Ass'Y,Over Running | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Electrical System : Starting Motor (7.5kw)(#62390-80844)
| 60***50 | Starting Motor Ass'Y,(7.5kw) (S6d105-1x) | 1 |
| KD***20 | Magnetic Switch Assembly | 1 |
| KD***40 | Spring,Spring | 4 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Electrical System : Starting Motor (7.5kw)(#75963-)
| 60***20 | Starting Motor A.,(7.5kw) | 1 |
| KD***30 | Washer Ass'Y,(Not Shown) | 1 |
| KD***60 | Terminal Ass'Y | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Electrical System : Starting Motor (7.5kw)(#80845-)
| 60***50 | Starting Motor Ass'Y,(7.5kw) | 1 |
| KD***60 | Shift Lever Assembly | 1 |
| KD***40 | Spring,Spring | 4 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Electrical System : Starting Motor And Mounting (5.5kw? 7.5kw)
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 3 |
| 01***36 | Washer,Radio Controlled Slag Handling | 3 |
| 07***00 | O-Ring,(F4350-65a1 -5 ) | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Electrical System : Starting Motor And Mounting (7.5kw)(#75963-)
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 3 |
| 01***36 | Washer,Radio Controlled Slag Handling | 3 |
| 07***00 | O-Ring,(F4350-65a1 -5 ) | 1 |
Engine Kit
Komatsu : 6d105-1bb(S/N 62390-Up) : Engine Kit : Gasket Kit (With Turbocharger)(#86387-)
| 07***18 | O-Ring,(See Fig.1601-29?1602-17) | 1 |
| 07***70 | O-Ring,(For Intake Air Cover) | 1 |
| 07***00 | O-Ring,(F4350-65a1 -5 ) | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Engine Kit : Gasket Kit(#86387-)
| 07***70 | O-Ring,(For Intake Air Cover) | 1 |
| 07***00 | O-Ring,(F4350-65a1 -5 ) | 1 |
| 07***45 | O-Ring,(F4320-61a0 -16 ), O-Ring; Was 07000-02145 | 1 |
Fuel System
Komatsu : 6d105-1bb(S/N 62390-Up) : Fuel System : Additional Fuel Filter
| 07***12 | Gasket,Mechanical Pump Piping | 2 |
| 60***00 | Fuel Filter Ass'Y | 1 |
| 60***20 | Cartridge,Pref | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Fuel System : Fuel Filter And Piping
| 01***30 | Bolt,(For France Noise Suppression) | 4 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 4 |
| 01***16 | Washer,(With Shoe Slip Control) | 2 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Fuel System : Fuel Injection Pump (Coupling)
| 61***51 | Injection Pump Ass'Y | 1 |
| 61***52 | Injection Pump Ass'Y | 1 |
| DK***00 | Bolt | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Fuel System : Fuel Injection Pump (Coupling) (With Turbocharger)
Komatsu : 6d105-1bb(S/N 62390-Up) : Fuel System : Fuel Injection Pump (Coupling)(#86387-)
| DK***00 | Bolt | 1 |
| DK***00 | Washer,Lock | 2 |
| DK***00 | Coupling,Cross | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Fuel System : Fuel Injection Pump (Feed Pump)
| 61***51 | Injection Pump Ass'Y | 1 |
| 61***52 | Injection Pump Ass'Y | 1 |
| DK***20 | Bolt, Joint | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Fuel System : Fuel Injection Pump (Feed Pump) (With Turbocharger)
| DK***20 | Bolt, Joint | 1 |
| DK***20 | Pump,Priming | 1 |
| DK***20 | Housing | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Fuel System : Fuel Injection Pump (Feed Pump) (With Turbocharger)(#86387-)
| DK***20 | Bolt, Joint | 1 |
| DK***20 | Pump,Priming | 1 |
| DK***20 | Housing | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Fuel System : Fuel Injection Pump (Governor) (1/2) (With Turbocharger)
| DK***00 | Adapter | 1 |
| DK***80 | Nut | 1 |
| DK***00 | Nut,Lock | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Fuel System : Fuel Injection Pump (Governor) (1/2) (With Turbocharger)(#86387-)
| DK***00 | Adapter | 1 |
| DK***80 | Nut | 1 |
| DK***00 | Nut,Lock | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Fuel System : Fuel Injection Pump (Governor) (2/2) (With Turbocharger)
| DK***40 | Gasket,Air Compressor | 2 |
| DK***00 | Nut,Cap | 1 |
| DK***00 | Bushing | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Fuel System : Fuel Injection Pump (Governor) (2/2) (With Turbocharger)(#86387-)
| DK***40 | Gasket,Air Compressor | 2 |
| DK***00 | Nut,Cap | 1 |
| DK***00 | Spring | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Fuel System : Fuel Injection Pump (Governor) (2/2)(#75883-)
| 61***52 | Injection Pump Ass'Y | 1 |
| DK***40 | Gasket,Air Compressor | 2 |
| DK***00 | Nut,Cap | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Fuel System : Fuel Injection Pump (Pump)
| 61***50 | Injection Pump Ass'Y | 1 |
| 61***51 | Injection Pump Ass'Y | 1 |
| 61***52 | Injection Pump Ass'Y | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Fuel System : Fuel Injection Pump (Pump) (With Turbocharger)
| 61***70 | Injection Pump Ass'Y | 1 |
| DK***10 | Washer,Spring | 1 |
| DK***20 | Housing | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Fuel System : Fuel Injection Pump (Pump) (With Turbocharger)(#86387-)
| 61***80 | Injection Pump Ass'Y | 1 |
| DK***10 | Washer,Spring | 1 |
| DK***20 | Housing | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Fuel System : Fuel Injection Pump And Piping (With Turbocharger)(#86387-)
Komatsu : 6d105-1bb(S/N 62390-Up) : Fuel System : Fuel Injection Pump And Piping(#86387-)
| 01***70 | Bolt | 4 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 1 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Fuel System : Fuel Nozzle And Spill Pipe
| 01***55 | Bolt,(For Trimming Dozer) | 12 |
| 01***25 | Washer,Spring?(Sandy And Dusty Spec.) | 12 |
| 07***12 | Gasket,Mechanical Pump Piping | 2 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Fuel System : Solenoid And Mounting(#75883-)
| 01***20 | Bolt | 4 |
| 01***50 | Bolt - Torque Converter Totransmission Mounting | 2 |
| 01***03 | Nut? L.H. Thread,L.H. Thread | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Fuel System : Water Separator
| 07***60 | O-Ring,(For Pc750?800?1800) (A2610) | 1 |
| 60***00 | Water Separator A.,(4d105-5h? 4d105-5t) | 1 |
| 60***60 | Plug,Drain (4d105-5h? 4d105-5t) | 1 |
Lubricating Oil System
Komatsu : 6d105-1bb(S/N 62390-Up) : Lubricating Oil System : Lubricating Oil Cooler
| 01***25 | Bolt,(Without Auto Priming System) | 7 |
| 01***30 | Bolt,(Cold Terrain Spec.) | 3 |
| 01***35 | Bolt,(Without Auto Priming System) | 12 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Lubricating Oil System : Lubricating Oil Cooler(#75963-)
| 01***25 | Bolt,(Without Auto Priming System) | 7 |
| 01***30 | Bolt,(Cold Terrain Spec.) | 3 |
| 01***35 | Bolt,(Without Auto Priming System) | 12 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Lubricating Oil System : Lubricating Oil Filter And Mounting (With Turbocharger)
| 01***65 | Bolt,(For Alternator Bracket Mount) | 1 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 3 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Lubricating Oil System : Lubricating Oil Filter And Mounting (With Turbocharger)(#86387-)
| 01***65 | Bolt,(For Alternator Bracket Mount) | 1 |
| 01***16 | Bolt,(Sandy And Dusty Spec.) | 2 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 3 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Lubricating Oil System : Lubricating Oil Filter And Piping
| 01***16 | Bolt,(For Slag Handling) | 2 |
| 01***35 | Bolt,(Without Auto Priming System) | 1 |
| 01***90 | Bolt | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Lubricating Oil System : Lubricating Oil Filter Piping (With Turbocharger)
| 01***16 | Bolt,(For Slag Handling) | 2 |
| 01***95 | Bolt | 1 |
| 01***55 | Bolt,(For Suction? Reversible Fan) | 3 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Lubricating Oil System : Lubricating Oil Pump And Suction Pipe
| 01***25 | Bolt,(Without Auto Priming System) | 3 |
| 01***30 | Bolt,(Cold Terrain Spec.) | 1 |
| 01***45 | Bolt,(S6d155-4b) | 1 |
Komatsu : 6d105-1bb(S/N 62390-Up) : Lubricating Oil System : Turbocharger Lubricating Oil Piping (With Turbocharger)
| 01***22 | Bolt,(Cold Terrain Spec.) | 2 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 2 |
| 01***25 | Washer,Spring?(Sandy And Dusty Spec.) | 2 |
6D105-1BB(S/N 62390-UP) serial number reference
The engine data plate is riveted to the rocker (cylinder head) cover or to the left side of the cylinder block near the fuel injection pump, stamped with the full model code (6D105-1BB) and the engine serial number; the wheel loader's own machine PIN plate sits on the frame near the articulation joint or inside the cab on the right console post. Read the engine suffix letters after the dash (here "1BB") together with the serial run (62390-UP) as one unit - swapping either half of that code onto a different loader or generation will pull the wrong parts and torque data.
| Prefix | Identifies | Notes |
|---|---|---|
| WA200-1 | Wheel loader host, chassis S/N 10001-UP | Confirmed host for this engine spec in the machine parts book. Naturally aspirated 6-cylinder, roughly 81 kW (109 hp) class, direct-injection 105 mm bore family. A parallel engine spec, 6D105-1Z (also S/N 62390-UP), was offered on the same WA200-1 chassis run - check the engine nameplate suffix to confirm which one is actually fitted before ordering parts. |
Frequently asked questions
What engine is the 6D105-1BB (S/N 62390-UP)?
It is a Komatsu inline 6-cylinder diesel engine: 105 mm x 125 mm (4.13 in x 4.92 in) bore and stroke, roughly 6.49 liter displacement, mechanical jerk-pump direct injection, and no electronic control module. Engine oil capacity runs about 24 liters (6.3 US gal) total, with coolant capacity depending on the radiator package fitted by the host machine.
What is the operating weight of the 6D105-1BB machine?
The 6D105-1BB is the engine itself, so it has no published operating weight of its own. As factory-fitted to its documented host, a mid-size wheel loader, the machine sits in roughly the 9.5 to 9.7 tonne operating-weight class, with exact figures varying by bucket, counterweight, and other configuration choices on the host chassis.
What replaced the 6D105-1BB (S/N 62390-UP)?
No factory record documents a direct one-to-one successor tied to this specific suffix and serial block. The broader 6D105 architecture carried forward into later Komatsu dash generations with turbocharged and eventually electronically governed variants, but for this exact build the practical path today is parts and rebuild support rather than a drop-in factory replacement.
What 6D105-1BB(S/N 62390-UP) owners discuss
What do owners say about starting this engine in cold weather?
What's the most commonly reported fuel-system wear point on this engine family?
Any recurring cooling-system complaints on this engine?
Is rising oil consumption or smoke normal on a high-hour unit?
Does this engine have onboard diagnostics or fault codes like later Komatsu engines?
What's the engine's general reputation among owners who ran it in its factory-fitted wheel loader?
What should I check before buying a used or reman 6D105-1BB core?
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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