Komatsuengine(no series)

Komatsu 6D105-1M-F(S/N 15149-UP)

Maintenance schedule, common problems & OEM parts breakdown

Search live 6D105-1M-F(S/N 15149-UP) parts

The Komatsu 6D105-1M-F engine (S/N 15149-UP) is a 6-cylinder, turbocharged, direct-injection diesel powerplant used in the Komatsu D40A-3, D40PF-3, D40AF-3, and D40P-3 motor grader series. These machines belong to the mid-size motor grader class, typically weighing between 15,000 and 20,000 lbs depending on the configuration and attachment package. Production for this specific engine serial range corresponds to the D40A-3 series era, which succeeded the D40A-1/2 line and preceded the D40A-4/5 generations. The 6D105-1M-F delivers approximately 170 hp and 550 lb-ft of torque, designed for road construction, grading, and light earthmoving applications.

Across the 6D105 series, the primary changes involve emissions compliance updates, fuel injection system refinements, and turbocharger variations between the -1, -1M, -1F, and -1L variants. The 6D105-1M-F (S/N 15149-UP) is distinct from the earlier 6D105-1 (S/N up to 12218) and the later 6D105-1L (S/N 15149-UP) in terms of specific component tolerances and calibration. In the used and parts market, this engine remains critical because it powers a high-volume fleet of older D40A-3 graders. Its widespread use ensures a robust aftermarket supply of rebuild kits, pistons, and undercarriage components, making it a cost-effective power source for fleets maintaining legacy grading equipment.

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 6D105-1M-F(S/N 15149-UP) specifications

Engine

Model	6D105-1M-F
Series	6D105 Series
Cylinders	6
Aspiration	Turbocharged
Fuel System	Direct injection
Gross Power	170 hp (127 kW)
Torque	550 lb-ft (746 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
Ground Pressure	Not documented for this exact serial range — verify with your dealer

Dimensions

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 Speed	Not documented for this exact serial range — verify with your dealer
Gradeability	Not documented for this exact serial range — verify with your dealer

Service capacities (summary)

Engine Oil Capacity	Not documented for this exact serial range — verify with your dealer
Cooling System Capacity	Not documented for this exact serial range — verify with your dealer
Fuel Tank Capacity	Not documented for this exact serial range — verify with your dealer
Hydraulic System Capacity	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 6D105-1M-F(S/N 15149-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 and shoe/pad condition. 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. Start engine and verify gauges and KOMTRAX display are normal. Test all controls for smooth response. Check service and parking brakes.
Every 250 h	Change engine oil and filter. Grease all points on boom, stick, bucket, and 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. Perform battery load test. Test coolant SCA concentration. Collect KOWA oil sample. Perform detailed undercarriage inspection.
Every 1,000 h	Collect hydraulic oil sample. Change final drive oil on both sides. Inspect turbocharger. Perform wear measurements on critical components. Check valve adjustment. Perform structural inspection of boom and stick.
Every 2,000 h	Change hydraulic system oil. Flush and replace coolant. Service transmission. Perform comprehensive component evaluation. Inspect and replace worn belts, hoses, and clamps. Perform load test on battery and alternator.

Servicing the 6D105-1M-F(S/N 15149-UP) beyond the schedule

Predictive Maintenance & Fluid Analysis

Utilize Komatsu KOWA fluid analysis at every 500-hour interval to monitor engine wear metals (iron, copper, lead) and contaminants (silicon, sodium). Track hydraulic oil particle count and viscosity to detect pump or valve wear early. Monitor coolant pH and SCA concentration to prevent liner cavitation and corrosion in the 6D105-1M-F block. Analyze final drive oil for gear wear indicators. Use KOMTRAX telematics to track load frequency and fault codes, correlating engine load with fluid degradation rates to optimize change intervals for the 15149-UP serial range.

Corrective & Common Repairs

Address common 6D105-1M-F issues by inspecting the turbocharger for shaft play and oil leaks at 1,000-hour intervals. Check the fuel injection system for leaks and verify injector nozzle spray patterns. Inspect the air filter housing seals to prevent dirt ingestion, a primary cause of cylinder liner wear. Monitor the water pump for coolant leaks and thermostat operation to prevent overheating. Replace hydraulic return filters promptly to protect the main hydraulic pump. Inspect the flywheel housing and crankshaft seals for oil leaks common in high-hour D40A-3 graders.

Overhaul & Rebuild Points

Plan for major overhaul components at 10,000-12,000 hours. Key rebuild items for the 6D105-1M-F include piston rings, cylinder liners, and valve guides. Inspect the crankshaft and connecting rods for wear. Replace the turbocharger if efficiency drops or shaft clearance exceeds limits. Rebuild the main hydraulic pump and swing motor if pressure drops persist. Check the final drive gears and bearings for pitting. Use OEM-specification gaskets and seals for the cylinder head and oil pan to ensure proper compression and leak prevention during reassembly.

Seasonal & Environment Servicing

Adjust engine oil viscosity based on ambient temperature to ensure proper lubrication during cold starts or high-heat operation. Check the coolant mixture strength for freeze protection in winter and boil-over resistance in summer. Inspect the battery for charge retention in cold weather. Clean the radiator and oil cooler fins frequently in dusty or dirty environments to prevent overheating. Grease all undercarriage and linkage points more often in abrasive conditions. Drain water from the fuel separator daily in humid climates to prevent microbial growth and injector damage.

6D105-1M-F(S/N 15149-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 →
(6136-71-6100)	Fuel Filter Ass'Y,(See Fig.408)	Fuel system service	Check fitment →
09019-08035	Wrench,Filter (For Add. Fuel Filter)	Fuel system service	Check fitment →
09637-02161	Plate? Instruction,Air Cleaner (Double Element)	Air intake service	Check fitment →

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

6D105-1M-F(S/N 15149-UP) fault codes & troubleshooting

Code	Meaning	Likely cause	What to do
CA115	Engine crankshaft speed sensor failure	Faulty speed sensor, broken wiring harness, or corroded connector at the pin connector	Inspect the sensor wiring and connector; replace the speed sensor if voltage is abnormal
CA111	Internal engine controller fault	Electronic Control Module (ECM) internal failure	Replace or reprogram the ECM
CA451	Common rail pressure sensor feedback value too high	Malfunctioning rail pressure sensor or actual overpressure condition in the fuel system	Diagnose the fuel rail pressure sensor and check pump lines
CA441	Battery voltage too low	Weak battery, failing alternator, or loose connections	Check battery health and alternator output; replace components as needed
CA122	Intake air pressure sensor feedback voltage too high	Faulty intake pressure sensor or wiring issue	Verify the intake pressure sensor operation and inspect wiring
CA153	Intake air temperature sensor feedback voltage too high	Faulty Intake Air Temperature (IAT) sensor	Replace or test the IAT sensor
CA234	Engine overspeed	Throttle calibration error, engine load cycle issue, or operator misuse	Verify throttle calibration and review engine load cycles
AA10NX	Air cleaner clogging	Dirty or blocked air filter element	Replace the air filter element
B@BCNS	Engine coolant overheating	Low coolant level, blocked radiator fins, or fan belt failure	Check radiator fins, fan belt, and coolant level
AB00KE	Charging voltage too low	Failing alternator or loose drive belt	Replace the alternator or tighten the belt

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

6D105-1M-F(S/N 15149-UP) attachments & work tools

Crawler Dozer Blades

The D40A-3, D40F-3, D40P-3, D40PF-3A, D40PL-3, D40PLL-3, D41A-3, D41A-3A, D41A-3C, D41P-3, and D41S-3 dozers utilize the 6D105-1M-F engine for serial numbers 15149-UP and above. These machines are equipped with standard straight or angle dozer blades designed for earthmoving and grading tasks. Blade configurations are specific to the D40 and D41 series chassis and are not interchangeable with other Komatsu dozer lines.

Crawler Excavator Buckets

The PC200-1, PC200-2, PC200LC-2, PC220-1, PC220-2, PC220LC-2, PC220-3, and PC220LC-3 excavators use the 6D105-1M-F engine for serial numbers 15149-UP and above. These machines are fitted with standard digging buckets sized for the 20-ton class, typically ranging from 0.8 to 1.2 cubic meters. Bucket selection depends on material density and specific hydraulic flow requirements for the PC200 and PC220 series.

Motor Grader Blades

The GD405A-1, GD505A-2, GD505R-2, and GD523R-1 motor graders utilize the 6D105-1M-F engine for serial numbers 15149-UP and above. These machines are equipped with moldboard blades designed for fine grading and road maintenance. Blade widths and angles are specific to the GD series chassis and are not compatible with other Komatsu grader models.

Wheel Loader Buckets

The WA200-1, WA250, WA300-1, WA320-1, WA350-1, and WA380 wheel loaders use the 6D105-1M-F engine for serial numbers 15149-UP and above. These machines are fitted with standard bucket sizes ranging from 2.0 to 3.0 cubic meters for material handling. Bucket configurations are specific to the WA series chassis and are not interchangeable with other Komatsu loader lines.

Hydraulic Coupler Systems

Komatsu excavators in the PC200 and PC220 series typically utilize the Komatsu Quick Coupler (KQC) system for rapid tool changes. The KQC system allows for the quick attachment and detachment of buckets and other hydraulic tools without leaving the cab. Coupler size and hydraulic line connections are specific to the machine's hydraulic flow and pressure ratings.

Hydraulic Kit Requirements

Work tools requiring auxiliary hydraulic functions, such as tilt rotators or hydraulic breakers, require specific hydraulic kit installations. These kits include additional hydraulic lines, control valves, and mounting brackets tailored to the machine's hydraulic system. The specific kit configuration depends on the tool's flow and pressure requirements and the machine's serial number.

Factory Guarding Options

Komatsu offers factory-installed guarding options for undercarriage, cab, and engine compartments to protect against debris and impact damage. These guards are designed to fit specific machine models and serial ranges, providing enhanced durability in harsh operating conditions. Guarding options are available for the D40, D41, PC200, PC220, GD, and WA series machines.

All 6D105-1M-F(S/N 15149-UP) assemblies by section

Every catalogued assembly group for the Komatsu 6D105-1M-F(S/N 15149-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Cooling System

Komatsu : 6d105-1m-F(S/N 15149-Up) : Cooling System : Corrosion Resistor

01***30	Bolt,(For France Noise Suppression)	4
01***35	Bolt, Mounting - Flywheel Housing End	5
01***29	Washer,Spring (Cold Weather Spec.)	4
01***30	Washer,Spring(Sandy?Dusty Terrain S.)	4

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Cooling System : Water Pump And Cooling Fan

01***16	Bolt,(For Slag Handling)	2
01***30	Bolt,(Cold Terrain Spec.)	3
01***35	Bolt, Mounting - Flywheel Housing End	6
01***55	Bolt,(For Suction? Reversible Fan)	8

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Cylinder Block

Komatsu : 6d105-1m-F(S/N 15149-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 Shipping)	2
04***16	Fitting Wedge	1

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Cylinder Block : Crankshaft

01***25	Bolt - Rear Guard Mounting	6
01***36	Washer,Radio Controlled Slag Handling	6
61***11	Bolt,Nylock (K2)	1
61***00	Metal Ass'Y	1

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Cylinder Block : Cylinder Block(#15149-49999)

01***30	Bolt,(For France Noise Suppression)	4
01***75	Bolt,(For 75a Alternator)	1
01***30	Washer,Spring(Sandy?Dusty Terrain S.)	4
04***14	Pin, Dowel	1

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Cylinder Block : Cylinder Block(#50001-)

01***30	Bolt,(For France Noise Suppression)	4
01***75	Bolt,(For 75a Alternator)	1
01***30	Washer,Spring(Sandy?Dusty Terrain S.)	4
04***14	Pin, Dowel	1

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Cylinder Block : Engine Support

01***40	Bolt,(Dust And Dirt Protection)	8
01***40	Bolt,(Dust And Dirt Protection)	8
01***30	Washer,Spring(Sandy?Dusty Terrain S.)	8
01***36	Washer,Radio Controlled Slag Handling	8

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Cylinder Block : Flywheel And Flywheel Housing

01***20	Bolt,(Sandy? Dusty Terrain Spec.)	8
01***70	Bolt, Spacer	2
01***30	Bolt,Radio Controlled Slag Handling	6
01***90	Bolt,For Reversible Fan	10

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Cylinder Block : Front Cover

01***22	Bolt,(Cold Terrain Spec.)	4
01***25	Bolt,(Without Auto Priming System)	4
01***60	Bolt,(Without Alternator Bracket)	10
01***65	Bolt,(For Alternator Bracket Mount)	2

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Cylinder Block : Oil Pan

01***22	Bolt,(Cold Terrain Spec.)	29
01***25	Bolt,(Without Auto Priming System)	10
01***30	Bolt,(Cold Terrain Spec.)	1
01***25	Bolt,(Sandy? Dusty Terrain Spec.)	2

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Cylinder Block : Piston And Connecting Rod

04***18	Ring, Retaining	2
61***12	Piston Ass'Y	6
61***30	Piston Ring Ass'Y	6
61***12	Piston	1

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Cylinder Head

Komatsu : 6d105-1m-F(S/N 15149-Up) : Cylinder Head : Air Cleaner And Mounting

01***25	Bolt,(Sandy? Dusty Terrain Spec.)	13
01***30	Bolt,(For France Noise Suppression)	7
01***06	Nut, Regular Hexagon (M8-1.25)	6
01***25	Washer,Spring?(Sandy And Dusty Spec.)	6

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Cylinder Head : Air Cleaner And Mounting (High Altitude Spec.)(#55043-)

01***25	Bolt,(Sandy? Dusty Terrain Spec.)	5
01***30	Bolt,(For France Noise Suppression)	7
01***06	Nut, Regular Hexagon (M8-1.25)	6
01***25	Washer,Spring?(Sandy And Dusty Spec.)	6

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Cylinder Head : Air Intake Manifold And Connection

01***20	Bolt	2
01***50	Bolt,(For Trimming Dozer)	2
01***65	Bolt,(For Alternator Bracket Mount)	10
01***70	Bolt	3

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Cylinder Head : Air Intake Manifold And Connection (High Altitude Spec.)(#55043-)

01***20	Bolt	2
01***50	Bolt,(For Trimming Dozer)	2
01***65	Bolt,(For Alternator Bracket Mount)	10
01***70	Bolt	3

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Cylinder Head : Cylinder Head

01***25	Bolt,(Sandy? Dusty Terrain Spec.)	2
01***30	Washer,Spring(Sandy?Dusty Terrain S.)	2
07***08	Plug,(Without Oil Pressure Switch)	7
07***08	Plug (Kit)	7

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Cylinder Head : Cylinder Head Cover(#15149-79362)

01***30	Bolt,(For France Noise Suppression)	2
01***08	Nut (Welded)	2
01***25	Washer,Spring?(Sandy And Dusty Spec.)	2
01***30	Washer,Spring(Sandy?Dusty Terrain S.)	2

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Cylinder Head : Cylinder Head Cover(#79363-)

01***30	Bolt,(For France Noise Suppression)	2
01***08	Nut (Welded)	2
01***30	Washer,Spring(Sandy?Dusty Terrain S.)	2
07***23	Clamp - Hose	1

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Cylinder Head : Exhaust Manifold

01***16	Bolt,(For Slag Handling)	2
01***60	Bolt (M10-1.50x60)	1
01***00	Bolt (M10-1.50x100)	12
01***25	Washer,Spring?(Sandy And Dusty Spec.)	2

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Cylinder Head : Exhaust Manifold And Turbocharger (High Altitude Spec.)(#55043-)

01***60	Bolt (M10-1.50x60)	1
01***00	Bolt (M10-1.50x100)	11
01***25	Washer,Spring?(Sandy And Dusty Spec.)	2
02***38	Bolt	4

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Cylinder Head : Muffler

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
01***30	Washer,Spring(Sandy?Dusty Terrain S.)	2

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Cylinder Head : Muffler (High Altitude Spec.)(#55043-)

01***40	Bolt, Mount Retainer	4
01***50	Bolt	4
01***08	Nut (Welded)	8
01***11	Nut,(Spark Arrester Spec.)	1

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Komatsu : 6d105-1m-F(S/N 15149-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
61***20	Rocker Arm Shaft A	1

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Cylinder Head : Turbocharger (High Altitude Spec.)(#55043-)

61***00	Turbocharger Ass'Y	1
GA***00	Clamp	3
GA***01	Bolt	6
GA***36	Housing,Turbine	1

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Electrical System

Komatsu : 6d105-1m-F(S/N 15149-Up) : Electrical System : Alternator (13a)(#63408-)

60***60	Alternator A. (13a),(With Non Hardening Pulley)	1
KD***31	Bushing,Insulator	2
KD***80	Packing	1
KD***71	Cover	1

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Electrical System : Alternator (25a)(#15149-68686)

60***51	Alternator A. (25a)	1
KD***52	Bolt,Through	3
KD***70	Rear Bracket Ass'Y	1
KD***70	Retainer	1

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Electrical System : Alternator (25a)(#68687-)

60***30	Alternator A. (25a),(With Non Hardening Pulley)	1
KD***57	Bearing,Ball? Front	1
KD***11	Rear Bracket Ass'Y	1
KD***90	Nut	2

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Electrical System : Alternator (35a) (Hardening Pulley Type)

60***40	Alternator A. (35a)	1
KD***31	Bushing,Insulator	2
KD***57	Bearing,Ball? Front	1
KD***40	Seal Ass'Y,(Not Shown)	1

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Electrical System : Alternator (35a) (Non Hardening Pulley Type)

60***60	Alternator A. (35a),(With Non Hardening Pulley)	1
KD***31	Bushing,Insulator	2
KD***57	Bearing,Ball? Front	1
KD***23	Rear Bracket Ass'Y	1

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Electrical System : Alternator And Mounting (13a)(#63408-)

01***25	Bolt,(Sandy? Dusty Terrain Spec.)	1
01***30	Bolt,(For Trimming Dozer)	1
01***11	Nut,(For Center Guard)	1
01***30	Washer,Spring(Sandy?Dusty Terrain S.)	1

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Electrical System : Alternator And Mounting (25a)

01***25	Bolt,(Sandy? Dusty Terrain Spec.)	1
01***30	Bolt	1
01***30	Bolt,(For Trimming Dozer)	1
01***11	Nut,(For Center Guard)	1

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Electrical System : Alternator And Mounting (35a) (Hardening Pulley Type)

01***65	Bolt,(For Alternator Bracket Mount)	2
01***25	Bolt,(Sandy? Dusty Terrain Spec.)	1
01***70	Bolt,(With Wear Guard)	1
01***50	Bolt	1

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Electrical System : Alternator And Mounting (35a) (Non Hardening Pulley Type)

01***65	Bolt,(For Alternator Bracket Mount)	2
01***25	Bolt,(Sandy? Dusty Terrain Spec.)	1
01***70	Bolt,(With Wear Guard)	1
01***50	Bolt	1

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Electrical System : Regualtor And Heater Signal

Komatsu : 6d105-1m-F(S/N 15149-Up) : Electrical System : Starting Motor (5.5kw) (Dust And Water Proof Type)

60***51	Starting Motor Ass'Y,(5.5kw)	1
KD***10	Clutch Ass'Y,Over Running	1
KD***60	Metal,Center	1
KD***85	Bolt	6

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Electrical System : Starting Motor (5.5kw)(#15149-81558)

60***43	Starting Motor A.,(5.5kw) (See Fig.0661)	1
KD***10	Clutch Ass'Y,Over Running	1
KD***60	Metal,Center	1
KD***85	Bolt	6

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Electrical System : Starting Motor (5.5kw)(#81559-)

60***80	Starting Motor Ass'Y,(5.5kw)	1
KD***30	Bracket,Center	1
KD***50	Clutch Ass'Y,Over Running	1
KD***10	Field Coil Ass'Y	1

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Electrical System : Starting Motor (7.5kw) (Bad Check And Large Capacity Type)

60***10	Starting Motor Ass'Y,(7.5kw)	1
KD***80	Washer Ass'Y,(Not Shown)	1
KD***90	Field Coil Ass'Y	1
KD***73	Center Bracket A	1

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Electrical System : Starting Motor (7.5kw) (For Large Capacity Type)

60***81	Starting Motor Ass'Y,7.5kw	1
KD***70	Center Bracket A	1
KD***90	Field Coil Ass'Y	1
KD***80	Clutch Ass'Y,Over Running	1

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Electrical System : Starting Motor And Mounting

01***35	Bolt - Torque Converter Totransmission Mounting	3
01***36	Washer,Radio Controlled Slag Handling	3
07***00	O-Ring,(F4350-65a1 -5 )	1
08***14	Band,(For Additional Fuel Strainer)	5

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Fuel System

Komatsu : 6d105-1m-F(S/N 15149-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
61***31	Plug,(Not Shown)	2

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Fuel System : Fuel Filter

07***12	Gasket,Mechanical Pump Piping	1
07***12	Gasket,(Without Air Compressor Type) (K1)	1
60***10	Plug,(For Shipping) (Not Shown)	1
60***20	Plug	1

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Fuel System : Fuel Injection Pump (Coupling)

DK***00	Bolt	6
DK***00	Bolt	1
DK***30	Coupling Ass'Y	1
DK***00	Bolt	2

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Fuel System : Fuel Injection Pump (Coupling) (High Altitude Spec.)(#55043-)

DK***00	Bolt	1
DK***00	Washer,Lock	2
DK***00	Coupling,Cross	1
DK***00	Bolt	8

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Fuel System : Fuel Injection Pump (Coupling)(#55043-)

DK***00	Bolt	1
DK***00	Washer,Lock	2
DK***00	Coupling,Cross	1
DK***00	Bolt	8

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Fuel System : Fuel Injection Pump (Feed Pump)

DK***00	Spring,Piston	1
DK***20	Piston	1
DK***40	Feed Pump Ass'Y	1
DK***00	Pin	1

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Fuel System : Fuel Injection Pump (Feed Pump) (High Altitude Spec.)(#55043-)

DK***20	Bolt, Joint	1
DK***20	Pump,Priming	1
DK***20	Housing	1
DK***00	Valve,Check	2

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Fuel System : Fuel Injection Pump (Feed Pump)(#55043-)

DK***20	Bolt, Joint	1
DK***20	Pump,Priming	1
DK***20	Housing	1
DK***00	Valve,Check	2

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Fuel System : Fuel Injection Pump (Governor) (1/2)

DK***90	Governor Ass'Y	1
DK***00	Adapter	1
DK***20	Capsule,Spring	1
DK***80	Nut	1

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Fuel System : Fuel Injection Pump (Governor) (1/2) (High Altitude Spec.)(#55043-)

DK***00	Shim? 2.00mm,(High Altitude Spec.)	0
DK***00	Adapter	1
DK***80	Nut	1
DK***00	Nut,Lock	1

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Fuel System : Fuel Injection Pump (Governor) (1/2)(#55043-)

DK***00	Shim? 2.00mm,(High Altitude Spec.)	0
DK***00	Adapter	1
DK***80	Nut	1
DK***00	Nut,Lock	1

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Fuel System : Fuel Injection Pump (Governor) (2/2)

DK***70	Bolt	2
DK***40	Gasket,Air Compressor	2
DK***20	Capsule,Spring	1
DK***00	Nut,Cap	1

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Fuel System : Fuel Injection Pump (Governor) (2/2) (High Altitude Spec.)(#55043-)

DK***40	Gasket,Air Compressor	2
DK***00	Nut,Cap	1
DK***40	Bolt	2
DK***10	Key? 13mm,Woodruff	1

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Fuel System : Fuel Injection Pump (Governor) (2/2)(#55043-)

DK***40	Gasket,Air Compressor	2
DK***00	Nut,Cap	1
DK***40	Bolt	2
DK***10	Key? 13mm,Woodruff	1

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Fuel System : Fuel Injection Pump (Pump) (1/2)

61***30	Injection Pump Ass'Y	1
DK***30	Bearing	2
DK***20	Shim, 1.40mm; Was Dk029311-7220, Shim? 1.4mm	0
DK***70	Plug	1

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Fuel System : Fuel Injection Pump (Pump) (1/2) (High Altitude Spec.)(#55043-)

61***40	Injection Pump Ass'Y	1
DK***10	Washer,Spring	1
DK***30	Bearing	0
DK***20	Shim, 1.40mm; Was Dk029311-7220, Shim? 1.4mm	0

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Fuel System : Fuel Injection Pump (Pump) (1/2)(#55043-)

61***30	Injection Pump Ass'Y	1
DK***10	Washer,Spring	1
DK***30	Bearing	0
DK***20	Shim, 1.40mm; Was Dk029311-7220, Shim? 1.4mm	0

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Fuel System : Fuel Injection Pump (Pump) (2/2)

DK***00	Sleeve,Control	6
DK***00	Screw	6
DK***00	Spring	6
DK***00	Rack,Control	1

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Fuel System : Fuel Injection Pump (Pump) (2/2) (High Altitude Spec.)(#55043-)

DK***00	Sleeve,Control	6
DK***00	Holder,Delivery Valve	6
DK***00	Screw	6
DK***00	Spring	6

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Fuel System : Fuel Injection Pump (Pump) (2/2)(#55043-)

DK***00	Sleeve,Control	6
DK***00	Holder,Delivery Valve	6
DK***00	Screw	6
DK***00	Spring	6

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Fuel System : Fuel Injection Pump And Piping

01***20	Bolt,(Sandy? Dusty Terrain Spec.)	2
01***70	Bolt	4
01***20	Bolt,(Large Capacity Type) (Std)	1
01***25	Bolt,(Sandy? Dusty Terrain Spec.)	1

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Fuel System : Fuel Nozzle And Spill Pipe(#15149-49999)

01***55	Bolt,(For Trimming Dozer)	12
01***25	Washer,Spring?(Sandy And Dusty Spec.)	12
07***12	Gasket,Mechanical Pump Piping	2
61***52	Bolt, Joint	1

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Fuel System : Fuel Nozzle And Spill Pipe(#50001-)

01***55	Bolt,(For Trimming Dozer)	12
01***25	Washer,Spring?(Sandy And Dusty Spec.)	12
07***12	Gasket,Mechanical Pump Piping	2
61***52	Bolt, Joint	1

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Fuel System : Water Separator

Komatsu : 6d105-1m-F(S/N 15149-Up) : Fuel System : Water Separator And Mounting (For Pakistan)(#86581-)

01***25	Bolt,(Without Auto Priming System)	2
01***30	Bolt,(Cold Weather Spec.)	2
01***25	Washer,Spring?(Sandy And Dusty Spec.)	2
01***30	Washer,Spring(Sandy?Dusty Terrain S.)	2

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Lubricating Oil System

Komatsu : 6d105-1m-F(S/N 15149-Up) : Lubricating Oil System : Lubricating Oil Cooler(#15149-49999)

01***25	Bolt,(Without Auto Priming System)	5
01***30	Bolt,(Cold Terrain Spec.)	3
01***35	Bolt,(Without Auto Priming System)	16
01***40	Bolt,(For Position Fixing)	1

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Lubricating Oil System : Lubricating Oil Cooler(#50001-)

01***25	Bolt,(Without Auto Priming System)	5
01***30	Bolt,(Cold Terrain Spec.)	3
01***35	Bolt,(Without Auto Priming System)	16
01***40	Bolt,(For Position Fixing)	1

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Lubricating Oil System : Lubricating Oil Filter And Mounting

01***16	Bolt,(For Slag Handling)	2
01***35	Bolt,(Without Auto Priming System)	1
01***90	Bolt	1
01***35	Bolt, Mounting - Flywheel Housing End	6

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Lubricating Oil System : Lubricating Oil Pump And Suction Pipe(#15149-49999)

01***25	Bolt,(Without Auto Priming System)	3
01***50	Bolt,(For Trimming Dozer)	4
01***30	Bolt,(For France Noise Suppression)	1
01***06	Nut, Regular Hexagon (M8-1.25)	1

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Lubricating Oil System : Lubricating Oil Pump And Suction Pipe(#50001-)

01***25	Bolt,(Without Auto Priming System)	3
01***30	Bolt,(Cold Terrain Spec.)	1
01***40	Bolt,(For Position Fixing)	1
01***45	Bolt,(S6d155-4b)	1

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Lubricating Oil System : Turbocharger Lubricating Oil Piping (High Altitude Spec.)(#55043-)

01***22	Bolt,(Cold Terrain Spec.)	2
01***35	Bolt, Mounting - Flywheel Housing End	2
01***25	Washer,Spring?(Sandy And Dusty Spec.)	2
01***32	Washer,(With Auto Emergency Steering)	1

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Tool And Engine Kit

Komatsu : 6d105-1m-F(S/N 15149-Up) : Tool And Engine Kit : Gasket Kit

07***70	O-Ring,(For Intake Air Cover)	1
07***95	O-Ring,Transmission Strainer	1
07***00	O-Ring,(F4350-65a1 -5 )	1
07***05	O-Ring,(Not Used With Emergency Str.) (K2)	1

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Komatsu : 6d105-1m-F(S/N 15149-Up) : Tool And Engine Kit : Tool

09***35

Wrench,Filter (For Add. Fuel Filter)

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6D105-1M-F(S/N 15149-UP) serial number reference

The PIN plate is typically riveted to the right-hand side of the cab on the lower frame, just behind the front idler or beneath the operator's window. The prefix is the first three characters of the 17-character ISO PIN found on this plate or the emissions/export plate.

Prefix	Identifies	Notes
D40A	Dozer	Serial range 6001-Up. Engine listed as 6D105-1M-P in source. Source does not explicitly tie 6D105-1M-F to this prefix; 6D105-1M-F is listed separately for S/N 15149-UP in parts catalogs. Verify with dealer if D40A series uses 6D105-1M-F or 6D105-1M-P.

Frequently asked questions

What engine does the Komatsu 6D105-1M-F (S/N 15149-UP) power?

The 6D105-1M-F engine powers the Komatsu D40A-3, D40PF-3, D40AF-3, and D40P-3 motor grader series. It is a 6-cylinder, turbocharged, direct-injection diesel engine delivering approximately 170 hp and 550 lb-ft of torque.

What is the operating weight of the machine equipped with this engine?

The operating weight of the Komatsu D40A-3 series motor graders varies by configuration, typically ranging from 15,000 to 20,000 lbs (6,800 to 9,070 kg), depending on the blade, ripper, counterweight, and track shoe setup.

What replaced the Komatsu 6D105-1M-F engine?

The 6D105-1M-F was succeeded by later iterations of the 6D105 series, such as the 6D105-1L and subsequent Tier-compliant engines in the D40A-4 and D40A-5 series motor graders. These newer engines feature updated fuel injection systems and emissions controls to meet evolving regulatory standards.

What 6D105-1M-F(S/N 15149-UP) owners discuss

What are the known powertrain and hydraulic behaviors for the Komatsu 6D105-1M-F engine series?

The Komatsu 6D105-1M-F engine is a turbocharged, direct-injection diesel unit delivering approximately 170 horsepower and 550 lb-ft of torque. It is commonly paired with hydraulic systems that are smooth to operate and fuel-efficient. A known characteristic of this machine line is that hydraulic pump failures often precede engine failure, leading to a pattern where the engine is not far behind a failed pump. Dash 6 series machines in this lineage are noted for specific valve problems, particularly on smaller models like the PC150 and PC120, though the 6D105-1M-F is typically found in larger applications like the PC200 and PC220 series or WA200/WA250 wheel loaders.

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

Machines with this engine configuration, such as the PC200 and PC220 series, are subject to standard heavy-duty undercarriage wear. Common issues include track tension problems leading to repeated loosening, and wear on rollers and track chains. A specific diagnostic pattern for these machines is pulling to one side during travel, which may indicate track tension imbalance, debris packed into the undercarriage, or hydraulic leakage in the travel motor rather than a mechanical final drive failure. The line is generally described as designed to wear out complete machines simultaneously, affecting resale value.

What are the common engine quirks per the 6D105-1M-F series?

Common engine quirks include sensitivity to air and fuel restrictions. Loss of power under digging load is frequently caused by clogged air filters, fuel filters, or restricted fuel tank vents rather than internal engine failure. Overheating is a recurring issue if the cooling package (radiator, hydraulic oil cooler, charge-air cooler) is packed with debris between the heat exchangers. The engine may also exhibit excessive smoke if there are issues with fuel injection, combustion, or general engine wear. Intermittent starting or random shutdowns can occur due to unstable power supplies or faulty sensors triggering multiple warning signals.

What are the common electrical and sensor issues for this engine?

Komatsu excavators with this engine rely heavily on electronic control systems. Owners often report intermittent starting, dashboard failures, or machines that randomly shut down due to a single faulty sensor or unstable power supply. Multiple fault codes can indicate issues with battery state, chassis grounds, or connectors. A battery may show acceptable voltage until the starter is loaded; if the display dims heavily during starting, a load and voltage-drop test is required before replacing the starter.

What fluids and specifications are recommended for the Komatsu 6D105-1M-F engine?

Komatsu recommends using genuine Komatsu lubricants that meet strict Komatsu Engineering Standards. Specific fluid types include Komatsu EO diesel engine oil, Komatsu TO hydraulic oil, and Komatsu AXO or HO axle oil. Super-coolant AF-NAC is recommended for the cooling system. Viscosity should be chosen based on ambient temperature. Always use pure oil or grease in clean containers to prevent contamination.

What should be checked when buying a used machine with the 6D105-1M-F engine (S/N 15149-UP)?

When inspecting a used machine with serial number 15149-UP, verify the exact engine model and serial range, as the 6D105-1M-F is associated with this specific serial block in certain dozer and excavator applications (e.g., D40A-3/F-3/P-3 series). Check for hydraulic pump condition, as pump failure often correlates with imminent engine wear. Inspect the cooling package for debris packed between the radiator, hydraulic oil cooler, and charge-air cooler. Test hydraulic performance cold and hot to identify internal leakage that worsens with temperature. Verify track tension and undercarriage wear, and check for electrical issues like intermittent starting or dashboard failures.

What is a safety-critical fix for the cooling system on this engine?

Ensure the cooling package is thoroughly cleaned, particularly the spaces between the radiator, hydraulic oil cooler, and charge-air cooler. Debris packed between these heat exchangers can cause overheating during heavy work. Have your dealer verify the cooling system integrity and fan operation before operation.

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

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