Komatsuengine(no series)

Komatsu 6D125E-2G(S/N 61779-UP)

Maintenance schedule, common problems & OEM parts breakdown

Search live 6D125E-2G(S/N 61779-UP) parts

The Komatsu 6D125E-2G engine (S/N 61779-UP) is a 4-cycle, water-cooled, inline vertical diesel engine with direct injection and a turbocharger. It is a 6-cylinder unit with an 11-liter displacement, producing 275 horsepower (205 kilowatts) and 1,010 pound-feet (1,370 Newton meters) of torque. This powerplant is primarily fitted to Komatsu D58P-1 and D58P-1B dozers (S/N 80588-UP) and PC400LC-6LKHD-6LK excavators. It belongs to the 125 Series family, succeeding earlier 6D125-1 and S6D125-1 variants. The engine operates on diesel fuel with a consumption rate of 18.5 gallons per hour (70 liters per hour) at rated power.

The 6D125E-2G represents a specific serial range within the broader 6D125E-2 series, distinguished by its S/N 61779-UP designation. While it shares the core architecture of the 125 Series, this generation incorporates updated emissions and performance specifications required for its specific machine applications. In the used and parts market, the 6D125E-2G remains significant due to its installation in heavy-duty dozers and excavators that are still active in earthmoving and mining. Its robust design and widespread use in the D58 and PC400 series ensure a steady demand for overhaul kits, gaskets, and specific engine components, making it a critical reference point for fleet maintenance and parts sourcing.

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 6D125E-2G(S/N 61779-UP) specifications

Engine

Model	6D125E-2G
Displacement	11.0 liter (671 cu in)
Cylinders	6 cylinder in line
Bore	125 mm (4.92 in)
Stroke	150 mm (5.91 in)
Power	228-235 kW (306-315 hp) @ 1950 rpm
Torque	1,010 lbf·ft (1,370 N·m)
Emissions Tier	Not documented for this exact serial range — verify with your dealer

Weights

Operating Weight	Not documented for this exact serial range — verify with your dealer
Shipping Weight	Not documented for this exact serial range — verify with your dealer
Engine Weight	approx: the OEM part reference Kg (2,138-2,425 lb)
Ground Pressure	Not documented for this exact serial range — verify with your dealer

Dimensions

Engine Length	Approx 1500-1800 mm (59.1-70.9 in)
Engine Width	Approx 900 mm (35.4 in)
Engine Height	Approx 1200-1500 mm (47.2-59.1 in)
Transport Length	Not documented for this exact serial range — verify with your dealer
Transport Width	Not documented for this exact serial range — verify with your dealer
Transport Height	Not documented for this exact serial range — verify with your dealer
Track Gauge	Not documented for this exact serial range — verify with your dealer
Ground Clearance	Not documented for this exact serial range — verify with your dealer

Performance

Travel Speeds	Not documented for this exact serial range — verify with your dealer
Gradeability	Not documented for this exact serial range — verify with your dealer
Dig Depth	Not documented for this exact serial range — verify with your dealer
Bucket Capacity	Not documented for this exact serial range — verify with your dealer

Service capacities (summary)

Fuel Tank	Not documented for this exact serial range — verify with your dealer
Hydraulic System	Not documented for this exact serial range — verify with your dealer
Engine Oil	Not documented for this exact serial range — verify with your dealer
Cooling System	Not documented for this exact serial range — verify with your dealer

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

Komatsu 6D125E-2G(S/N 61779-UP) maintenance schedule

Service interval	Tasks
Every 10 h	Check engine oil level and condition. Check hydraulic fluid level at sight glass. Check coolant level and ensure cap is secure. Check fuel level and drain water from separator. Check DEF level on Tier 4 machines. Check air filter restriction indicator. Inspect track tension, shoe/pad condition, and undercarriage. Inspect hydraulic hoses for cracks or leaks. Inspect pins, bushings, and attachment points. Clear debris from radiator and oil cooler fins. Check for fluid leaks under the machine. Verify ROPS/FOPS integrity and seat belt function. Test horn, backup alarm, and lights. Ensure emergency shutoff is accessible. Verify gauges and KOMTRAX display are normal after start. Test all controls for smooth response. Check service and parking brakes.
Every 250 h	Change engine oil and filter. Grease all points (boom, stick, bucket, swing bearing). Check fluid levels. Check air filter element. Inspect belts, hoses, and clamps. Perform visual walk-around inspection.
Every 500 h	Replace fuel filter and drain water separator. Replace hydraulic return filter. Service battery and test alternator. Test coolant SCA concentration. Collect KOWA oil sample. Perform detailed undercarriage inspection.
Every 1,000 h	Change hydraulic oil. Change final drive oil on both sides. Inspect turbocharger. Take wear measurements on critical components. Check valve adjustment. Perform structural inspection of boom and stick.
Every 2,000 h	Flush and replace coolant. Service transmission. Perform comprehensive component evaluation. Inspect KDPF (at 4,500-hour intervals). Replace worn belts and hoses. Load test battery and alternator.

Servicing the 6D125E-2G(S/N 61779-UP) beyond the schedule

Predictive Maintenance & Fluid Analysis

Utilize KOWA (Komatsu Oil Wear Analysis) at every major service interval to monitor engine wear metals (iron, copper, lead, aluminum) and contaminants (silicon, sodium). Track hydraulic fluid particle count, viscosity, and oxidation levels to predict pump and valve failures. Monitor coolant pH, SCA concentration, and glycol content to prevent corrosion and overheating. Analyze transmission and final drive oil for gear wear indicators. Use KOMTRAX telematics to correlate fluid trends with load frequency and fault codes for proactive intervention.

Corrective & Common Repairs

Address common 6D125E-2G issues by inspecting the turbocharger for shaft play and housing damage during 1,000-hour services. Check the fuel injection pump and injectors for leakage or clogging, which can cause rough idling or power loss. Inspect the water pump and thermostat for coolant leaks or overheating symptoms. Verify the condition of the air filter element and clean or replace as needed to prevent dirt ingestion. Check the starter motor and alternator connections for corrosion or wear, ensuring reliable starting and charging.

Overhaul & Rebuild Points

Plan for an out-of-frame overhaul when compression drops below specification or oil consumption exceeds limits. Key rebuild components include pistons, rings, cylinder liners, bearings, and gaskets. Inspect the crankshaft for wear and the camshaft for lobe degradation. Replace the head gasket and cylinder head bolts if torque specifications cannot be maintained. Ensure the flywheel housing and clutch alignment are correct during reassembly. Use Komatsu Genuine Lubricants to break in the rebuilt engine and maximize component life.

Seasonal & Environment Servicing

In cold climates, ensure the cooling system uses the correct super-coolant AF-NAC concentration to prevent freezing. Check the battery charge and insulation to handle high cranking loads. In hot environments, frequently clean debris from the radiator and oil cooler fins to maintain optimal operating temperatures. Inspect belts and hoses for heat degradation. Use Komatsu Genuine Diesel Engine Oil with the appropriate viscosity for ambient temperatures. Monitor the DEF level and quality in Tier 4 applications to ensure emissions system functionality.

6D125E-2G(S/N 61779-UP) common service parts

Part number	Part	Notes
07281-00197	Clamp,(With Pre-Fuel Filter)	Fuel system service	Check fitment →
ND092220-0040	Filter,Fuel	Fuel system service	Check fitment →
09019-08035	Wrench,Filter (For Add. Fuel Filter)	Fuel system service	Check fitment →
09637-30163	Plate? Instruction,Air Cleaner (Single Element)	Air intake service	Check fitment →
09637-30263	Plate? Instruction,Air Cleaner Element Mainte	Air intake service	Check fitment →

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

6D125E-2G(S/N 61779-UP) fault codes & troubleshooting

Code	Meaning	Likely cause	What to do
CA115	Engine crankshaft speed sensor failure	Broken sensor, wiring issue, or connector corrosion	Replace the speed sensor and verify the voltage at the pin connector
CA111	Internal engine controller fault	ECM hardware or software failure	Replace or reprogram the ECM
CA441	Battery voltage too low	Weak battery, poor connections, or alternator failure	Replace the alternator or battery; check the voltage regulator
CA442	Battery voltage too high	Faulty voltage regulator or alternator overcharging	Replace the alternator or battery; check the voltage regulator
CA122	Intake air pressure high voltage	Sensor malfunction or actual overpressure condition	Verify the intake pressure sensor and wiring
CA123	Intake air pressure low voltage	Sensor short or airflow restriction	Check for a sensor short or an airflow restriction
CA153	Intake air temperature sensor error	Faulty IAT sensor	Replace or test the IAT sensor
CA428	Fuel moisture sensor invalid voltage	Contaminated fuel or sensor harness issue	Ensure a clean fuel supply, and check the moisture sensor harness
CA451	Common rail pressure sensor feedback value too high	Rail sensor malfunction or actual overpressure	Diagnose the fuel rail pressure sensor or pump lines
CA234	Engine overspeed	Throttle calibration error, engine load cycle issue, or operator misuse	Verify throttle calibration, engine load cycle, or operator misuse

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

6D125E-2G(S/N 61779-UP) attachments & work tools

Bulldozer Blade Systems

The Komatsu 6D125E-2G engine (S/N 61779-UP) is primarily associated with the D58P-1B dozer series (S/N 80588-UP) in the factory equipment guide. This class utilizes semi-universal (SU) or straight (S) dozer blades with typical widths ranging from 3.0 to 3.5 meters. Factory configurations include ROPS/FOPS certified operator cabs and heavy-duty undercarriage guards for high-abrasion environments.

Excavator Work Tools

This engine powers the PC400LC-6 and PW400MH-6 excavator classes, which utilize standard quick-coupler systems for interchangeable bucket and hammer attachments. Typical bucket capacities for this size class range from 1.5 to 2.5 cubic meters, with hydraulic flow requirements managed by the machine's main pump arrangement rather than the engine directly.

Wheel Loader Attachments

The WA470-DZ-3 wheel loader is a confirmed application for the 6D125E-2G engine, utilizing a pin-on or quick-attach system for buckets and grapples. Standard bucket capacities for this loader class are typically between 3.0 and 4.0 cubic meters, with factory options including side-dump buckets and heavy-duty rock buckets for mining applications.

Hydraulic & Cooling Options

Factory options for machines equipped with this engine include high-capacity radiators and oil coolers for extended duty cycles. Hydraulic system configurations vary by machine model, with some applications requiring specific flow rates to support high-demand work tools like hydraulic hammers or breakers.

All 6D125E-2G(S/N 61779-UP) assemblies by section

Every catalogued assembly group for the Komatsu 6D125E-2G(S/N 61779-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Engine

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Air Cleaner (High Altitude Spec.)(#64065-)

01***40	Bolt,(Dust And Dirt Protection)	2
01***25	Bolt,(For Canvas Canopy?Head Guard)	2
01***30	Bolt,(For Quick Shift) (Mitsubishi)	6
01***25	Bolt,(For Canvas Canopy?Head Guard)	2

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Air Cleaner Cap (High Altitude Spec.)(#64812-)

60***30	Cap	1
61***40	Pipe,(Sandy And Dusty Spec.)	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Air Cleaner Cap(#64065-81733)

60***30

Cap

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Air Cleaner Cap(#80455-)

60***30

Cap

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Air Cleaner(#64065-)

01***25	Bolt,(For Canvas Canopy?Head Guard)	2
01***40	Bolt (Op)	1
01***08	Nut,(For Straight Tilt Dozer) (D65p)	6
01***16	Washer,Radio Controlled Slag Handling	6

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Air Intake Manifold (High Altitude Spec.)(#64812-)

01***30	Bolt,(With Body Positioner)	16
01***55	Bolt,(See Service News)	5
01***10	Bolt,(With Joy Stick Steering)	8
01***45	Bolt, Mount Divider Valve	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Air Intake Manifold(#64065-)

01***30	Bolt,(With Body Positioner)	15
01***55	Bolt,(See Service News)	5
01***10	Bolt,(With Joy Stick Steering)	8
01***16	Washer,Radio Controlled Slag Handling	28

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Air Vent(#64065-75182)

07***12	Gasket,(Without Air Compressor Type) (K2)	12
07***10	Screw, Banjo Connector (M10-1.25x20)	6
61***60	Tube,Air Vent	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Air Vent(#75183-)

07***12	Gasket,(Without Air Compressor Type) (K2)	12
07***10	Screw, Banjo Connector (M10-1.25x20)	6
61***60	Tube,Air Vent	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Alternater (35a) (With Hardening Pulley) (Sandy And Dusty Spec.) (Inner Parts)(#64065-)

60***50	Alternator A. (35a)	1
60***51	Alternator A. (35a)	1
KD***50	Bracket,Rear	1
KD***70	Bushing,Insulate	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Alternater (35a) (With Hardening Pulley) (With Safety Cover) (Sandy And Dusty Spec.) (Inner Parts)(#64065-)

60***50	Alternator A. (35a)	1
60***51	Alternator A. (35a)	1
KD***50	Bracket,Rear	1
KD***70	Bushing,Insulate	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Alternater (35a) (With Non Hardening Pulley) (Cold Terrain (A) Spec.) (Inner Parts)(#64065-)

60***50	Alternator A. (35a)	1
60***51	Alternator A. (35a)	1
KD***50	Bracket,Rear	1
KD***70	Bushing,Insulate	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Alternater (35a) (With Non Hardening Pulley) (With Safety Cover) (Inner Parts)(#64065-)

60***50	Alternator A. (35a)	1
60***51	Alternator A. (35a)	1
KD***50	Bracket,Rear	1
KD***70	Bushing,Insulate	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Alternater Mounting (35a) (With Hardening Pulley) (Sandy And Dusty Spec.)(#64065-)

01***60	Bolt,(F4320-52a0 -5- )	4
01***75	Bolt - Tube Mounting	1
01***55	Screw	1
01***11	Nut,(For Center Guard)	2

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Alternater Mounting (35a) (With Hardening Pulley) (With Safty Cover) (Sandy And Dusty Spec.)(#64065-)

01***60	Bolt,(F4320-52a0 -5- )	4
01***75	Bolt - Tube Mounting	1
01***55	Screw	1
01***11	Nut,(For Center Guard)	2

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Alternater Mounting (35a) (With Non Hardening Pulley) (Cold Terrain (A) Spec.)(#64065-)

01***60	Bolt,(F4320-52a0 -5- )	4
01***75	Bolt - Tube Mounting	1
01***55	Screw	1
01***11	Nut,(For Center Guard)	2

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Alternater Mounting (35a) (With Non Hardening Pulley) (With Safety Cover) (Cold Terrain (A) Spec.)(#64065-)

01***60	Bolt,(F4320-52a0 -5- )	4
01***75	Bolt - Tube Mounting	1
01***55	Screw	1
01***11	Nut,(For Center Guard)	2

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Blind Plug (Without Water Temperature Sensor)(#64065-)

07***15	Plug,(Used When Without Heater)	1
07***15	Plug,(For Without Air Compressor)	1
28***70	Plug,(For Shipping)	2

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Block Heater(#64065-)

01***16	Bolt, Battery To Frame Ground Wire Attaching	1
01***16	Washer,Radio Controlled Slag Handling	1
60***20	Clip,(Large Capacity Type)	1
60***40	Heater,(Cold Terrain Spec.)	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Camfollower Cover(#64065-)

07***20	Clamp, Spring Hose	1
07***63	Hose	1
61***90	O-Ring,Breather	1
61***91	Packing,(See Fig.A2060)	9

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Camshaft (Mechanical Governor Spec.)

01***22	Capscrew	2
04***25	Key, Plain Woodruff	1
04***12	Ring,Snap (For Ripper)	12
61***12	Camshaft Assembly	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Camshaft(#61779-76795)

01***22	Capscrew	2
04***25	Key, Plain Woodruff	1
04***12	Ring,Snap (For Ripper)	12
61***12	Camshaft Assembly	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Caution Plate (English)(#80455-)

09***63

Plate? Instruction,Air Cleaner (Single Element)

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Caution Plate (French)(#80455-)

09***63

Plate? Instruction,Air Cleaner Element Mainte

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Caution Plate (German)(#80455-)

09***63

Plate? Instruction,Air Cleaner Element Mainte

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Caution Plate (Spanish)(#80455-)

09***63

Plate? Instruction,(Spanish) (Not Shown)

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Cooling Fan (Noise Suppression Spec.)(#64065-)

01***30	Bolt,(With Body Positioner)	12
60***40	Fan,Cooling	1
61***90	Spacer	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Cooling Fan (Reversible Fan)(#64065-)

01***25	Bolt,(For Canvas Canopy?Head Guard)	6
01***40	Bolt (Op)	6
60***40	Fan,Reversible	1
61***30	Spacer,(For Reversible Fan)	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Cooling Fan(#64065-)

01***30	Bolt,(With Body Positioner)	6
01***40	Bolt (Op)	6
60***40	Fan,Cooling	1
61***20	Spacer	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Corrosion Resistor(#64065-)

01***16	Bolt, Battery To Frame Ground Wire Attaching	1
01***30	Bolt,(With Body Positioner)	4
02***25	Bolt,(Cold Weather Spec.)	4
04***10	Clip,See Fig. K4010-17a0	2

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Crank Pulley (Hardening Pulley)(#64065-)

01***15	Bolt	1
01***20	Bolt	5
04***28	Pin, Dowel - Transmission Case, Pin-Dowel	1
61***61	Washer, Plain (14mm)	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Crank Pulley (Non Hardening Pulley)(#64065-)

01***15	Bolt	1
01***20	Bolt	5
04***28	Pin, Dowel - Transmission Case, Pin-Dowel	1
61***61	Washer, Plain (14mm)	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Crankshaft(#61779-67073)

61***10	Bearing, Main (Standard)	7
61***50	Bearing, Thrust Assembly (Standard)	1
61***10	Bearing, Main (1.00mm Undersize)	7
61***50	Bearing, Thrust Assembly (1.00mm Oversize)	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Crankshaft(#67074-)

61***10	Bearing, Main (Standard)	7
61***50	Bearing, Thrust Assembly (Standard)	1
61***10	Bearing, Main (1.00mm Undersize)	7
61***50	Bearing, Thrust Assembly (1.00mm Oversize)	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Cylinder Block (1/2) (High Altitude Spec.)(#64812-76494)

01***12	Bolt,(Without Air Compressor Type)	2
01***45	Washer,(For Travel Motor) (Not Show)	14
04***14	Pin, Dowel	2
04***20	Pin,Dowel (Welded)	12

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Cylinder Block (1/2) (With Block Heater)(#64065-76494)

01***12	Bolt,(Without Air Compressor Type)	2
01***45	Washer,(For Travel Motor) (Not Show)	14
04***14	Pin, Dowel	2
04***20	Pin,Dowel (Welded)	12

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Cylinder Block (1/2)(#64065-76893)

01***12	Bolt,(Without Air Compressor Type)	2
01***45	Washer,(For Travel Motor) (Not Show)	14
04***14	Pin, Dowel	2
04***20	Pin,Dowel (Welded)	12

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Cylinder Block (2/2) (High Altitude Spec.)(#64812-76494)

01***20	Bolt,(For Mono Lever Steering)	4
01***25	Bolt,(For Canvas Canopy?Head Guard)	5
07***30	Ring, Seal - Between Sections	1
07***10	Sleeve	3

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Cylinder Block (2/2) (With Block Heater)(#64065-76494)

01***20	Bolt,(For Mono Lever Steering)	4
01***25	Bolt,(For Canvas Canopy?Head Guard)	5
07***30	Ring, Seal - Between Sections	1
07***10	Sleeve	3

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Cylinder Block (2/2)(#64065-76893)

01***20	Bolt,(For Mono Lever Steering)	4
01***25	Bolt,(For Canvas Canopy?Head Guard)	5
07***30	Ring, Seal - Between Sections	1
07***10	Sleeve	3

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Cylinder Block (High Altitude Spec.)(#76796-)

01***12	Bolt,(Without Air Compressor Type)	2
01***45	Washer,(For Travel Motor) (Not Show)	14
04***14	Pin, Dowel	2
04***20	Pin,Dowel (Welded)	12

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Cylinder Block Blind Cover And Plug (Electrical Coolant Spec.)(#76495-)

01***20	Bolt,(For Mono Lever Steering)	4
01***25	Bolt,(For Canvas Canopy?Head Guard)	5
01***12	Bolt,(Without Air Compressor Type)	2
07***30	Ring, Seal - Between Sections	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Cylinder Block Blind Cover And Plug (High Altitude Spec.)(#76495-)

01***20	Bolt,(For Mono Lever Steering)	4
01***25	Bolt,(For Canvas Canopy?Head Guard)	5
01***12	Bolt,(Without Air Compressor Type)	2
07***30	Ring, Seal - Between Sections	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Cylinder Block Blind Cover And Plug(#76894-)

01***20	Bolt,(For Mono Lever Steering)	4
01***25	Bolt,(For Canvas Canopy?Head Guard)	5
01***12	Bolt,(Without Air Compressor Type)	2
07***30	Ring, Seal - Between Sections	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Cylinder Block Gasket Kit(#64065-)

07***21	O-Ring,Water Piping	1
07***30	Ring, Seal - Between Sections	1
07***15	O-Ring,Relief Valve	1
07***20	O-Ring,Lubricating Oil Piping	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Cylinder Head Gasket Kit(#64065-)

07***65	O-Ring,Cylinder Block	6
07***12	Gasket,Mechanical Pump Piping	12
07***12	Gasket,(Without Air Compressor Type) (K2)	12
08***14	Band,(For Additional Fuel Strainer)	3

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Cylinder Head(#61779-67991)

01***20	Bolt (M10-1.75x120)	6
04***20	Pin,Dowel (Welded)	2
07***08	Plug,(Without Lock-Up), Plug	1
07***10	Plug, Expansion	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Cylinder Head(#67992-)

01***20	Bolt (M10-1.75x120)	6
04***20	Pin,Dowel (Welded)	2
07***08	Plug,(Without Lock-Up), Plug	1
07***10	Plug, Expansion	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Damper(#64065-)

01***50	Bolt,For Weight Adjusting Bolt	6
61***20	Plate	1
61***00	Damper Ass'Y	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Engine Mounting(#64065-)

01***40	Bolt,R.H. Outside And L.H. Inside, Bolt	4
01***50	Bolt,(Shim Thickness?Less Than 8mm)	4
01***55	Bolt,(Tree Pusher Dozer)	2
01***40	Capscrew	4

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Exhaust Manifold

01***80	Screw	18
07***08	Plug,(Without Auto Priming System)	1
61***20	Spacer,(For Shipping)	18
61***40	Manifold,Exhaust? Center	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Exhaust Manifold (High Altitude Spec.)(#64812-)

01***80	Screw	18
07***08	Plug,(Without Auto Priming System)	1
61***20	Spacer,(For Shipping)	18
61***10	Gasket,Exhaust Manifold	6

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Exhaust Manifold (With Safety Cover)(#64065-79012)

01***20	Bolt	4
01***25	Bolt,Joint	2
01***45	Capscrew	1
01***80	Screw	12

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Exhaust Manifold (With Safety Cover)(#79013-)

01***20	Bolt	4
01***25	Bolt,Joint	2
01***45	Capscrew	1
01***80	Screw	12

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Exhaust Pipe (502.9mm)(#80455-)

01***11	Nut (M14-1.50 Thd), Nut; Was 01582-01411	2
61***20	Clamp	1
61***70	Washer,(Spark Arrester Spec.)	2
66***70	Pipe,Exhaust (For Trimming Dozer)	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Exhaust Pipe (Black Exhaust Pipe? 1013mm)(#80455-)

01***11	Nut (M14-1.50 Thd), Nut; Was 01582-01411	2
61***20	Clamp	1
61***90	Tube, Exhaust Stack (Glass Wool)	1
61***70	Washer,(Spark Arrester Spec.)	2

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Exhaust Pipe (Silver Exhaust Pipe? 1013mm) (With Rain Cap)(#80455-)

01***11	Nut (M14-1.50 Thd), Nut; Was 01582-01411	2
61***20	Clamp	1
61***70	Washer,(Spark Arrester Spec.)	2
66***50	Bolt, Exhaust Clamp	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Fan Drive (Noise Suppression Spec.)(#64065-)

01***30	Bolt,(With Body Positioner)	4
01***40	Bolt (Op)	2
01***95	Capscrew	4
01***08	Nut,(For Canvas Canopy?Head Guard)	2

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Fan Drive(#64065-)

01***30	Bolt,(With Body Positioner)	4
01***40	Bolt (Op)	2
01***95	Capscrew	4
01***08	Nut,(For Canvas Canopy?Head Guard)	2

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Fan Pulley (For 35a Alternator) (Ec? Dynamic Noise Suppression)(#72957-)

01***30	Bolt,(With Body Positioner)	6
04***70	V-Belt Set,(Noise Suppression Spec.)	1
61***30	Pulley,Hardening	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Fan Pulley (Hardening Pulley) (Sandy And Dusty Spec.) (For 35a Alternator)(#64065-)

04***67	V-Belt Set,(Tropical Sandy? Dusty Spec.)	1
61***61	Pulley? Hardening	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Fan Pulley (Non Hardening Pulley) (For 35a Alternator)(#64065-)

04***67	V-Belt Set,(Tropical Sandy? Dusty Spec.)	1
61***21	Pulley?Non Hardening,Non Hardening	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Fan Pulley (Non Hardening Pulley) (Noise Suppression Spec.) (For 35a Alternator)(#64065-)

01***30	Bolt,(With Body Positioner)	6
04***69	V-Belt Set,Fan	1
61***30	Pulley?Non Hardening	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Flywheel Housing(#64065-)

01***65	Bolt - Battery Box	2
01***50	Capscrew	6
01***65	Capscrew	2
01***40	Bolt (Op)	2

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Flywheel(#64065-)

01***65	Bolt	6
01***45	Washer,(For Travel Motor) (Not Show)	6
61***41	Gear, Ring	1
61***10	Shaft	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Front Cover Mounting(#76796-)

01***25	Bolt,(For Canvas Canopy?Head Guard)	1
01***65	Bolt - Return Line And Suction Linehose Clamps	8
01***75	Bolt (M10-1.50x75)	4
07***30	Ring, Seal - Between Sections	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Front Cover(#64065-76886)

01***25	Bolt,(For Canvas Canopy?Head Guard)	1
01***25	Bolt,(For Canvas Canopy?Head Guard)	1
01***65	Bolt - Return Line And Suction Linehose Clamps	8
01***75	Bolt (M10-1.50x75)	4

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Front Cover(#76796-)

09***50	Liquid Gasket, Lg-7, 150g	0
61***30	Seal? Front (K2)	1
61***80	Cover,Front	1
61***81	Cover,Front	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Fuel Filter(#64065-)

01***30	Bolt,(With Body Positioner)	4
01***35	Bolt,(F4320-52a0 -5 )	2
01***16	Washer,Radio Controlled Slag Handling	2
07***12	Gasket,Mechanical Pump Piping	2

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Fuel Injection Pump (Coupling) (Inner Parts)(#64065-)

ND***10	Flange,Coupling	1
ND***50	Bolt	1
ND***40	Bolt	2
ND***61	Bolt	2

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Fuel Injection Pump (Feed Pump) (Inner Parts)(#64065-)

ND***40	Washer? 1mm,Plate	1
ND***70	Washer,Union	4
ND***10	Spring, Check Valve	2
ND***20	Pump Ass'Y,Priming Pump	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Fuel Injection Pump (Governor) (1/2) (Inner Parts)(#64065-)

ND***40	Plate,Thrust	1
ND***40	Plug,Screw	1
ND***10	Adapter	1
ND***10	Spring,Governor	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Fuel Injection Pump (Governor) (2/2) (Inner Parts)(#64065-)

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Fuel Injection Pump (Pump) (1/2) (Inner Parts)(#64065-)

61***20	Injection Pump Ass'Y	1
61***21	Injection Pump Ass'Y	1
ND***20	Body Ass'Y	1
ND***80	Bearing,Center	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Fuel Injection Pump (Pump) (2/2) (Inner Parts)(#64065-)

ND***81	Cover	1
ND***60	Element,Pump	6
ND***11	Shim? 1.7mm	0
ND***70	O-Ring	6

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Fuel Injection Pump Drive

01***25	Bolt,(For Canvas Canopy?Head Guard)	4
01***14	Nut (Itl)	1
01***60	Washer,(Without Rops Guard? Canopy)	1
04***16	Fitting Wedge	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Fuel Injection Pump Mounting(#64065-)

01***75	Capscrew	4
61***10	Washer,Spring	4
(6***0)	Injection Pump Ass'Y,(See Fig.A4010-B3l1)	1
(6***1)	Injection Pump Ass'Y,(See Fig.A4010-B3l1)	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Fuel Injection Pump Piping

01***30	Screw	4
01***55	Bolt,(See Service News)	4
01***70	Bolt - Bracket And Oil Inlet Tubemounting	2
01***80	Bolt,(With Corrosion Resistor)	2

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Fuel Return(#64065-)

01***20	Bolt,(For Mono Lever Steering)	1
01***25	Bolt,(For Canvas Canopy?Head Guard)	1
01***08	Nut,(For Canvas Canopy?Head Guard)	1
01***16	Washer,Radio Controlled Slag Handling	2

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Head Cover Related Parts(#76208-)

01***25	Bolt,(For Canvas Canopy?Head Guard)	1
01***00	Bolt,(For Front Brake Release)	2
01***08	Nut,(For Canvas Canopy?Head Guard)	1
01***16	Washer,Radio Controlled Slag Handling	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Head Cover(#64065-76207)

01***25	Bolt,(For Canvas Canopy?Head Guard)	1
01***00	Bolt,(For Front Brake Release)	2
01***08	Nut,(For Canvas Canopy?Head Guard)	1
01***16	Washer,Radio Controlled Slag Handling	25

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Head Cover(#76208-)

01***16	Washer,Radio Controlled Slag Handling	24
61***11	Cover,Head? No.2?3?4?5?6	5
61***41	Head Cover Ass'Y,Head? No.1	1
61***51	Cover,Head? No.6	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Heater Signal(#64065-81509)

60***30

Signal,Engine Pre Heater

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Heater Signal(#80455-)

60***30

Signal,Engine Pre Heater

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Heater Switch (High Altitude Spec.)(#64812-)

01***16	Bolt - Box Mounting	2
01***55	Bolt,(See Service News)	1
01***10	Washer,(For 35a Alternator)	2
01***16	Washer,Radio Controlled Slag Handling	2

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Heater Switch(#64065-)

01***16	Bolt - Box Mounting	2
01***55	Bolt,(See Service News)	1
01***10	Washer,(For 35a Alternator)	2
01***16	Washer,Radio Controlled Slag Handling	2

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Idler Gear

01***60	Screw	1
01***60	Capscrew	1
01***25	Bolt,(For Canvas Canopy?Head Guard)	6
61***60	Pin, Dowel	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Injection Nozzle(#64065-81733)

01***45	Bolt, Mount Divider Valve	12
07***65	O-Ring,Cylinder Block	6
07***12	Gasket,(Without Air Compressor Type) (K2)	12
61***00	Nozzle Holder Ass'Y	6

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Injection Nozzle(#81734-)

01***45	Bolt, Mount Divider Valve	12
07***65	O-Ring,Cylinder Block	6
07***12	Gasket,(Without Air Compressor Type) (K2)	12
07***09	Tube,Spill	2

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Muffler (Black Exhaust Pipe? 1013mm) (With Safety Cover)(#64065-81733)

01***12	Bolt - Front Cover Mounting	15
01***40	Bolt (Op)	4
01***25	Bolt,Joint	4
01***30	Bolt	2

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Muffler (Black Exhaust Pipe? 1013mm)(#64065-81733)

01***40	Bolt (Op)	4
01***25	Bolt,Joint	4
01***30	Bolt	2
01***05	Capscrew	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Muffler (Exhaust Pipe? 502.9mm) (With Safety Cover)(#64065-81733)

01***12	Bolt - Front Cover Mounting	15
01***40	Bolt (Op)	4
01***25	Bolt,Joint	4
01***30	Bolt	2

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Muffler (Exhaust Pipe? 502.9mm)(#64065-81733)

01***40	Bolt (Op)	4
01***25	Bolt,Joint	4
01***30	Bolt	2
01***05	Capscrew	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Muffler (Silver Exhaust Pipe? 1013mm) (With Rain Cap)(#64065-81001)

01***40	Bolt (Op)	4
01***25	Bolt,Joint	4
01***30	Bolt	2
01***05	Capscrew	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Muffler(#.-)

01***12	Bolt - Front Cover Mounting	15
01***40	Bolt (Op)	4
01***25	Bolt,Joint	4
01***30	Bolt	2

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Name Plate And Caution (English)(#64065-81509)

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Name Plate And Caution (English)(#77941-80914)

04***50	Screw	4
09***63	Plate? Instruction,Air Cleaner (Single Element)	1
61***10	Plate? Name,(Limited Supply)	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Name Plate And Caution (For Regulation Of Epa)(#80915-)

04***50

Screw

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Name Plate And Caution (French)(#64065-81509)

09***61	Plate? Instruction,Air Cleaner (French)	1
61***20	Plate? Name,Engine (Limited Supply)	1
61***20	Plate? Name,(French) (Limited Supply)	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Name Plate And Caution (French-English)(#77941-80914)

04***50	Screw	4
09***63	Plate? Instruction,Air Cleaner Element Mainte	1
61***10	Plate? Name,(Limited Supply)	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Name Plate And Caution (German)(#64065-81509)

09***61	Plate? Instruction,(German-English) (Not Shown)	1
09***63	Plate? Instruction,Air Cleaner Element Mainte	1
61***20	Plate? Name,Engine (Limited Supply)	1
61***80	Plate? Name,(Limited Supply)	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Name Plate And Caution (German-English)(#77941-80914)

04***50	Screw	4
09***63	Plate? Instruction,Air Cleaner Element Mainte	1
61***10	Plate? Name,(Limited Supply)	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Name Plate And Caution (Spanish)(#64065-81509)

09***61	Plate? Instruction,(Spanish-English) (Not Shown)	1
09***63	Plate? Instruction,(Spanish) (Not Shown)	1
61***20	Plate? Name,Engine (Limited Supply)	1
61***60	Plate? Name,(Limited Supply)	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Name Plate And Caution (Spanish-English)(#77941-80914)

04***50	Screw	4
09***63	Plate? Instruction,(Spanish) (Not Shown)	1
61***10	Plate? Name,(Limited Supply)	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Name Plate And Caution Plate (For Eu Exhaust Gas Regulation)(#80915-)

04***50	Screw	4
61***10	Plate? Name,(Limited Supply)	1
61***11	Plate,(Limited Supply)	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Name Plate And Caution Plate (For Regulation Of Epa)(#65969-66827)

04***50	Screw	4
09***63	Plate? Instruction,Air Cleaner (Single Element)	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Name Plate And Caution Plate (For Regulation Of Epa)(#66828-80914)

04***50	Screw	4
09***63	Plate? Instruction,Air Cleaner (Single Element)	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Name Plate And Caution(#80915-)

61***20

Plate? Name,Engine (Limited Supply)

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Nozzle Holder (Inner Parts)(#64065-81733)

07***12	Gasket,Mechanical Pump Piping	2
61***10	Holder Ass'Y	1
ND***90	Connector,Inlet	1
ND***10	Shim? 0.775mm	0

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Nozzle Holder (Inner Parts)(#81734-)

07***12	Gasket,Mechanical Pump Piping	2
61***10	Holder Ass'Y	1
ND***90	Connector,Inlet	1
ND***10	Shim? 0.775mm	0

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Oil Adapter(#64065-)

01***16	Bolt, Battery To Frame Ground Wire Attaching	1
01***35	Bolt,(F4320-52a0 -5 )	2
01***50	Bolt,(Spark Arrester Spec.)	2
01***85	Bolt, Divider Valve Mounting	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Oil Cooler Mounting Parts (Extreme Cold Terrain Spec.)(#76796-)

01***25	Bolt,(For Canvas Canopy?Head Guard)	13
01***65	Bolt - Return Line And Suction Linehose Clamps	2
01***80	Bolt,(With Corrosion Resistor)	2
01***16	Washer,Radio Controlled Slag Handling	17

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Oil Cooler(#61779-76795)

01***25	Bolt,(For Canvas Canopy?Head Guard)	13
01***65	Bolt - Return Line And Suction Linehose Clamps	2
01***80	Bolt,(With Corrosion Resistor)	2
01***25	Bolt - Relay Mounting	2

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Oil Cooler(#76796-)

01***25	Bolt - Relay Mounting	2
07***42	O-Ring,(See Fig.A3310)	1
61***11	Element	1
61***25	Cover	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Oil Filter(#64065-)

01***25	Bolt,(For Canvas Canopy?Head Guard)	2
01***30	Bolt,(With Body Positioner)	4
01***35	Bolt,(F4320-52a0 -5 )	2
01***16	Washer,Radio Controlled Slag Handling	4

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Oil Level Gauge (With Heater)(#64065-)

01***25	Bolt,(For Canvas Canopy?Head Guard)	1
01***35	Bolt,(F4320-52a0 -5 )	1
01***08	Nut,(For Canvas Canopy?Head Guard)	1
01***16	Washer,Radio Controlled Slag Handling	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Oil Level Gauge(#64065-)

01***25	Bolt,(For Canvas Canopy?Head Guard)	1
01***35	Bolt,(F4320-52a0 -5 )	1
01***08	Nut,(For Canvas Canopy?Head Guard)	1
01***16	Washer,Radio Controlled Slag Handling	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Oil Pan And Suction Tube (With Heater)(#64065-)

01***16	Bolt, Battery To Frame Ground Wire Attaching	1
01***20	Bolt,(For Mono Lever Steering)	1
01***25	Bolt,(For Canvas Canopy?Head Guard)	32
01***30	Bolt,(With Body Positioner)	7

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Oil Pan And Suction Tube(#64065-)

01***25	Bolt,(For Canvas Canopy?Head Guard)	29
01***30	Bolt,(For Quick Shift) (Mitsubishi)	7
01***20	Bolt,(For Mono Lever Steering)	1
01***25	Bolt,(For Canvas Canopy?Head Guard)	32

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Oil Pump

01***25	Bolt,(Rear Attachment Less)	4
01***25	Bolt,(For Canvas Canopy?Head Guard)	3
01***35	Bolt,(F4320-52a0 -5 )	1
01***32	Washer,(With Auto Emergency Steering)	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Piston

02***13	Pin, Dowel	2
04***18	Ring, Snap	12
61***10	Pin,Piston	6
61***40	Bearing, Connecting Rod (Standard)	6

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Rocker Arm (Mechanical Governor Spec.)

01***75	Screw	40
01***08	Nut,R.H. Thread	2
01***32	Washer,(With Auto Emergency Steering)	40
61***10	Housing, Rocker Lever	6

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Rocker Arm(#61779-76795)

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Safety Guard (For Fuel Injection Pump Drive)

01***20	Bolt,(For Mono Lever Steering)	2
61***50	Cover, Safety	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Spare Parts (For 35a Alternetor)(#64065-80914)

04***68	V-Belt Set,(Tropical Sandy? Dusty Spec.)	1
07***34	O-Ring,Transmission And Steering Case	1
07***12	Gasket,Mechanical Pump Piping	1
09***35	Wrench,Filter (For Add. Fuel Filter)	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Spare Parts (Noise Suppression Spec.)(#64065-80914)

04***69	V-Belt Set,Fan	1
07***34	O-Ring,Transmission And Steering Case	1
07***12	Gasket,Mechanical Pump Piping	1
09***35	Wrench,Filter (For Add. Fuel Filter)	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Starting Motor (11kw) (Inner Parts)(#61779-86012)

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Starting Motor (11kw) (Inner Parts)(#86013-)

60***11	Starting Motor Ass'Y,(11kw)	1
KD***40	Spring,Spring	4
KD***57	Bearing, Ball, Front	1
KD***30	Armature Assembly	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Starting Motor (7.5kw) (Inner Parts)

60***11	Starting Motor Ass'Y,(7.5kw)	1
KD***60	Shift Lever Assembly	1
KD***40	Spring,Spring	4
KD***00	Terminal Assembly	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Starting Motor Mounting (11kw)(#61779-86012)

01***40	Bolt,(With Center Guard)	3
01***40	Bolt (Kit)	3
08***19	Band,(Without Air Conditioner)	1
08***10	Connector, Clip	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Starting Motor Mounting (11kw)(#86013-)

01***40	Bolt (Kit)	3
08***19	Band,(Without Air Conditioner)	1
08***10	Connector, Clip	1
62***10	Gasket,(See Fig.A6210)	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Starting Motor Mounting (7.5kw)

01***40	Bolt,(With Center Guard)	3
01***40	Bolt (Kit)	3
08***19	Band,(Without Air Conditioner)	1
08***10	Connector, Clip	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Tamper Proof Kit (For Regulation Of Epa)(#64065-)

61***10

Tamper Proof Kit

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Thermostat Housing

01***25	Bolt,(For Canvas Canopy?Head Guard)	2
01***65	Screw	4
02***04	Plug,(For Shipping)	1
07***15	Plug,(Used When Without Heater)	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Turbocharger (High Altitude Spec.) (Inner Parts)(#64065-)

61***00	Turbocharger Ass'Y,(Tv7705)	1
GA***85	V-Band Ass'Y	1
GA***07	Rotor Ass'Y	1
GA***85	V-Band	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Turbocharger Oil Piping (High Altitude Spec.)(#64065-)

01***20	Bolt,(For Mono Lever Steering)	5
01***30	Bolt,(With Body Positioner)	2
01***40	Bolt (Op)	1
01***45	Screw	4

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Water Drain Valve

61***12

Valve,Water Drain

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Water Pump Gasket Kit(#64065-)

02***37	O-Ring,(For Pc750?1800) (A5010)	1
07***15	O-Ring,Scavenge Pump	1
07***15	O-Ring,(F4320-57a0 -11 )	1
61***90	Gasket (K2?K6)	1

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Water Pump(#64065-75182)

01***16	Bolt - Seat And Tether Belt Mounting	6
01***20	Bolt,(For Mono Lever Steering)	2
01***30	Bolt,(With Body Positioner)	2
01***35	Bolt,(F4320-52a0 -5 )	2

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Water Pump(#75183-)

01***16	Bolt - Seat And Tether Belt Mounting	6
01***20	Bolt,(For Mono Lever Steering)	2
01***30	Bolt,(With Body Positioner)	2
01***35	Bolt,(F4320-52a0 -5 )	2

See all parts with full part numbers in Heavy Parts AI →

Komatsu : 6d125e-2g(S/N 61779-Up) : Engine : Water Separator(#64065-)

01***25	Bolt,(Rear Attachment Less)	2
01***25	Bolt,(For Canvas Canopy?Head Guard)	2
01***16	Washer,(For 35a Alternator)	2
07***60	O-Ring,(For Pc750?800?1800) (A2610)	1

See all parts with full part numbers in Heavy Parts AI →

6D125E-2G(S/N 61779-UP) serial number reference

The engine PIN plate is riveted to the engine block, typically on the left side near the injection pump or on the valve cover. Read the three-character prefix at the start of the machine model code stamped on the plate to identify the equipment family and series.

Prefix	Identifies	Notes
D58P-1	Dozer	Serial break at 80588; engine 6D125E-2G applies to S/N 61779-UP. Verify with dealer.
D60A-6	Dozer	Serial break at 20006; engine 6D125E-2G applies to S/N 61779-UP. Verify with dealer.

Frequently asked questions

What is the engine model for the Komatsu 6D125E-2G (S/N 61779-UP)?

The Komatsu 6D125E-2G (S/N 61779-UP) is a 4-cycle, water-cooled, inline vertical diesel engine with direct injection and a turbocharger. It is a 6-cylinder unit with an 11-liter displacement, producing 275 horsepower (205 kilowatts) and 1,010 pound-feet (1,370 Newton meters) of torque.

What is the operating weight of the machines using this engine?

The operating weight varies by configuration and series. Komatsu D58P-1 and D58P-1B dozers using this engine range from approximately 30,000 to 40,000 pounds (13,600 to 18,100 kilograms). Komatsu PC400LC-6LKHD-6LK excavators typically operate in the 35,000 to 45,000 pound (15,900 to 20,400 kilogram) range. Specific weights depend on the attachment package, counterweight, and track shoe configuration.

What engine replaced the 6D125E-2G?

The 6D125E-2G is part of the 125 Series lineage. It was succeeded by later iterations such as the SAA6D125E-5 and other Tier 4 compliant engines in newer Komatsu models. The specific successor depends on the machine model, as Komatsu transitioned to newer emissions-compliant engines across its dozer and excavator lines. For exact replacement engine details, consult the specific machine's operation and maintenance manual.

What 6D125E-2G(S/N 61779-UP) owners discuss

What are the known powertrain and hydraulic behaviors for the Komatsu 6D125E-2G engine series?

The 6D125E-2G series utilizes hardened cylinder liners matched to high-alloy piston rings and a Bosch-style fuel injection system operating at approximately 3,200 PSI. This configuration provides superior durability compared to earlier soft-liner designs. The engine is paired with Komatsu’s hydraulic system, noted for smooth operation and fuel efficiency. However, the hydraulic pump and engine are mechanically linked; excessive load on the hydraulic system can drag down engine RPM, and pump failure often precedes engine wear. The system is sensitive to oil viscosity, with performance degrading significantly if hydraulic fluid warms beyond optimal ranges due to internal leakage in pumps or valves.

What undercarriage and wear patterns are typical for machines equipped with this engine?

Machines using this engine series, such as the D58P-1 dozer (serial 80588-Up) and related excavators, exhibit wear patterns common to heavy earthmoving equipment. Track tensioners and undercarriage components like bushings, bearings, and track pads are subject to significant stress. Worn bushings lead to noise and vibration; bearing failure can cause premature track degradation. Operators should monitor track tension regularly to prevent loosening. The machine’s design aims for balanced wear, but continuous load and dust exposure accelerate component fatigue, particularly in the final drives and swing systems.

What are the specific quirks or characteristics of the 6D125E-2G engine series?

The 6D125E-2G engine (serial 61779-Up) is a 4-cycle, water-cooled, inline vertical direct-injection diesel with a turbocharger. It delivers approximately 275 horsepower (205 kW) and 1,010 lb-ft (1,370 Nm) of torque. A key characteristic is its robust fuel system, which avoids the 'slobbering' piston ring issues seen in some competitor engines at lower hour counts. The engine is designed for high efficiency, with a fuel consumption rate of approximately 18.5 gallons per hour (70 liters per hour) at rated power. It is often found in Komatsu dozers (e.g., D58P-1) and excavators, requiring specific maintenance intervals for its cooling and lubrication systems.

What are common electrical and sensor issues reported for this machine type?

Komatsu machines with this engine series rely heavily on electronic control systems. Common issues include intermittent starting, dashboard failures, and random shutdowns triggered by faulty sensors or unstable power supplies. Specific fault codes, such as CA115, indicate engine speed sensor faults caused by broken sensors, wiring issues, or connector corrosion. Multiple fault codes often point to battery state of charge, engine/chassis ground integrity, or connector corrosion. Owners report that a single faulty sensor can trigger multiple warning signals, necessitating careful diagnosis of the electrical circuit before replacing components.

What should be checked when buying a used machine with the 6D125E-2G engine (S/N 61779-Up)?

When purchasing a used machine with this engine, verify the exact serial number to confirm the 6D125E-2G designation (S/N 61779-Up) and check for the correct engine model plate. Inspect the cooling package (radiator, hydraulic oil cooler, charge-air cooler) for packed debris between heat exchangers. Test the engine under load to ensure it does not lose power or drop RPM excessively when hydraulics are engaged. Check for signs of oil burning or excessive blow-by, which may indicate ring or liner wear. Verify the condition of the hydraulic system; weakness when hot suggests internal leakage in pumps or valves. Inspect the undercarriage for track tension, roller condition, and bushing wear. Ensure the battery and main starter cable are in good condition, as voltage collapse during starting is a common issue.

What are the recommended fluid specifications for this engine and its associated systems?

Komatsu recommends using Komatsu Genuine Lubricants and Coolants, formulated to meet strict Komatsu Engineering Standards. For the engine, use Komatsu EO or equivalent diesel engine oil. For the hydraulic system, use Komatsu TO or HO hydraulic oil. The cooling system requires Komatsu Super Coolant AF-NAC. Using fluids that do not meet these specifications can lead to accelerated wear, overheating, and hydraulic system failure. Always consult the specific operation and maintenance manual for the machine model to confirm fluid capacities and change intervals.

What safety-critical fixes or inspections are required for this engine series?

Safety-critical inspections include verifying the integrity of the fuel supply system to prevent air ingress, which can cause starting issues and power loss. Check the condition of the turbocharger and charge-air hoses for leaks or damage. Ensure the cooling system is free of blockages and that the fan operates correctly to prevent overheating. Inspect the engine and chassis grounds for corrosion or looseness. Verify the operation of the safety lock and interlock systems. Have your dealer verify the exact serial range specifications and any applicable service bulletins for the 6D125E-2G engine before performing major repairs or modifications.

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

Need a specific 6D125E-2G(S/N 61779-UP) part?

Search live OEM part data, check fitment, and cross-reference alternatives with Heavy Parts AI.

Search parts in the app