Komatsuengine(no series)
Komatsu S6D105-1PP(S/N 81520-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu S6D105-1PP (S/N 81520-UP) is a six-cylinder, turbocharged diesel engine belonging to the S6D105 series. It powers mid-size crawler excavators such as the PC200-3 and PC220-3, as well as wheel loaders like the WA300-1 and WA320-1. These machines typically operate in the 20,000 to 60,000 lb weight range. The S6D105-1PP succeeded earlier S6D105 variants and was later replaced by the S6D105E-1 series to meet evolving emissions standards. Configurations included mechanical fuel systems and various turbocharging setups for different applications.
Across the S6D105 generation, Komatsu refined the engine's durability and fuel efficiency while maintaining a robust mechanical architecture. The S6D105-1PP remains significant in the used and parts market because it powers a high-volume fleet of reliable, older excavators and loaders. Its widespread use ensures a steady supply of aftermarket components and a large base of experienced technicians, making it a cost-effective choice for fleet maintenance and replacement.
Below: full specifications, fluids & capacities, the factory service schedule, common service parts, verified fault codes, what owners discuss, attachment guidance, the complete assembly directory, and a serial-number reference. Complete parts lists with full OEM part numbers, exploded diagrams, quantities, and fitment data are available free in Heavy Parts AI.
Komatsu S6D105-1PP(S/N 81520-UP) specifications
Engine
| Model | S6D105-1PP |
| Series | S6D105-1 |
| Displacement | 6.5 L (396 cu. in.) |
| Cylinders | 6 |
| Aspiration | Turbocharged |
| Fuel System | Direct injection, mechanical fuel system |
| Net Power | 170 hp (127 kW) |
| Torque | 550 lb-ft (745 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 Refill Capacity | 7.0 L (1.85 gal) |
| Cooling System Fluid 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 Fluid 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 S6D105-1PP(S/N 81520-UP) maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
Servicing the S6D105-1PP(S/N 81520-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize KOWA fluid analysis at every major service interval to monitor engine wear metals and hydraulic contamination. The S6D105-1PP relies on precise oil viscosity and coolant SCA levels to protect its turbocharger and cylinder liners. Regular sampling of hydraulic oil detects pump and valve wear early. Monitor DEF levels daily to ensure proper emissions system function. Track fuel consumption trends to identify injector performance issues before they cause downtime. Use KOMTRAX telematics to schedule sampling automatically.
Corrective & Common Repairs
Address common S6D105-1PP issues by inspecting the mechanical fuel system for leaks and air intrusion. Check turbocharger shaft play and housing integrity during the 1000-hour service. Replace worn injector O-rings and fuel lines to maintain combustion efficiency. Inspect the air filter housing seals to prevent dust ingestion. Monitor the hydraulic return filter for rapid clogging, which indicates pump wear. Replace worn belts and hoses during the 2000-hour service to prevent sudden failure.
Overhaul & Rebuild Points
Plan for an inframe overhaul when compression drops or oil consumption exceeds limits. The S6D105-1PP requires cylinder liner and piston ring replacement to restore power. Inspect the crankshaft journals and bearings for wear during disassembly. Replace the turbocharger if shaft play or oil leakage is detected. Rebuild the hydraulic pumps and valves if KOWA analysis shows high wear metals. Ensure all gaskets and seals are replaced to prevent leaks after reassembly.
Seasonal & Environment Servicing
Adjust coolant concentration based on ambient temperature to prevent freezing or overheating. Use the correct viscosity engine oil for cold starts and high-temperature operation. Inspect the radiator and oil cooler fins for debris buildup in dusty environments. Check the air filter restriction indicator more frequently in high-dust conditions. Drain water from the fuel separator daily in humid climates. Protect the battery from extreme cold with an insulating blanket or block heater.
S6D105-1PP(S/N 81520-UP) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 07281-00197 | Clamp,(With Pre-Fuel Filter) | Fuel system service | Check fitment → |
| 600-311-9121 | Cartridge,Fuel Filter | Fuel system service | Check fitment → |
| 09637-30262 | Plate? Instruction,Air Cleaner (Double Element) | Air intake service | Check fitment → |
| 6127-61-2971 | O-Ring,Oil Cooler Element | Lubrication service | Check fitment → |
| 6136-61-2190 | O-Ring,Oil Cooler Element | Lubrication service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
S6D105-1PP(S/N 81520-UP) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| CA115 | Engine crankshaft speed sensor and backup speed sensor failure | Faulty speed sensor, broken wiring harness, or corroded connector at the sensor pin | Inspect the sensor wiring and connector for damage; replace the speed sensor if voltage is abnormal at the pin |
| CA111 | Internal engine controller (ECM) fault | Electronic Control Module internal failure or corruption | 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 fuel pump lines for blockage |
| CA441 | Battery voltage too low | Weak battery, failing alternator, or poor electrical connections | Replace the alternator or battery; check the voltage regulator and charging circuit |
| CA122 | Intake air pressure sensor feedback voltage too high | Faulty intake pressure sensor or wiring short | Verify the intake pressure sensor operation and inspect the wiring harness |
| CA153 | Intake air temperature sensor feedback voltage too high | Faulty intake air temperature (IAT) sensor or open circuit | Replace or test the IAT sensor |
| CA234 | Engine overspeed | Throttle calibration error, excessive engine load cycle, or operator misuse | Verify throttle calibration and review engine load cycles |
| AA10NX | Air cleaner clogging | Blocked or dirty 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; clean debris from the cooler |
| DGH2KB | Hydraulic oil temperature sensor short circuit | Shorted hydraulic oil temperature sensor or wiring fault | Replace the hydraulic oil temperature sensor |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
S6D105-1PP(S/N 81520-UP) attachments & work tools
Excavator Attachments
The S6D105-1PP engine (S/N 81520-Up) powers the PC200-3 and PC200LC-3 crawler excavator class. Standard work tools include digging buckets and trenching buckets sized for the 20-ton class. Coupler systems are machine-specific to the PC200-3 boom and stick configuration. Hydraulic kits are required for quick couplers, utilizing Komatsu hydraulic oil (HO) and Komatsu diesel engine oil (TO) for system operation.
Dozer Attachments
This engine series is not documented for use in Komatsu dozer models in the provided sources. Dozer applications for the S6D105-1PP series are not listed in the equipment guide or shop manual references.
Wheel Loader Attachments
The S6D105-1PP engine is not documented for use in Komatsu wheel loader models in the provided sources. Wheel loader applications for this specific engine serial range are not listed in the equipment guide or shop manual references.
Grader Attachments
The S6D105-1PP engine (S/N 81520-Up) is not documented for use in Komatsu motor grader models in the provided sources. Grader applications for this specific engine serial range are not listed in the equipment guide or shop manual references.
Industrial/Power Generation Options
The S6D105-1PP engine is documented for use in industrial power generation sets, specifically the GD615A-1 model. Factory configurations include turbocharged aspiration and mechanical fuel systems. Fluid specifications include Komatsu Super-coolant AF-NAC and Komatsu diesel engine oil (TO).
All S6D105-1PP(S/N 81520-UP) assemblies by section
Every catalogued assembly group for the Komatsu S6D105-1PP(S/N 81520-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Accessory
Komatsu : S6d105-1pp(S/N 81520-Up) : Accessory : Air Compressor
| 61***12 | Air Compressor Ass'Y | 1 |
| DK***00 | Cylinder | 1 |
| DK***90 | Washer,Air Compressor | 2 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Accessory : Air Compressor Piping
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 4 |
| 01***16 | Washer,Radio Controlled Slag Handling | 4 |
| 04***16 | Key, Lever Mounting | 1 |
Cooling System
Komatsu : S6d105-1pp(S/N 81520-Up) : Cooling System : Corrosion Resistor And Piping
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 4 |
| 01***29 | Washer,Spring (Cold Weather Spec.) | 4 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Cooling System : Water Pump And Cooling Fan
| 01***16 | Bolt,(For Slag Handling) | 2 |
| 01***25 | Bolt,(Without Auto Priming System) | 2 |
| 01***30 | Bolt,(Cold Terrain Spec.) | 3 |
Cylinder Block
Komatsu : S6d105-1pp(S/N 81520-Up) : Cylinder Block : Camshaft And Tappet
| 01***25 | Bolt,(Without Auto Priming System) | 2 |
| 01***20 | Bolt,(Forwarded Individually Parts) | 2 |
| 01***25 | Washer,Spring?(Sandy And Dusty Spec.) | 2 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Cylinder Block : Crankshaft
| 01***25 | Bolt - Rear Guard Mounting | 6 |
| 01***45 | Bolt,Nylock | 1 |
| 01***25 | Bolt,L.H. (For Add. Air Compressor) | 6 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Cylinder Block : Cylinder Block
| 01***30 | Bolt,(For France Noise Suppression) | 4 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 4 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 4 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Cylinder Block : Flywheel And Flywheel Housing
| 01***40 | Bolt,(Dust And Dirt Protection) | 9 |
| 01***60 | Bolt, Trunnion Cap | 2 |
| 01***35 | Screw | 6 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Cylinder Block : Front Cover And Gear
| 01***22 | Bolt,(Cold Terrain Spec.) | 4 |
| 01***25 | Bolt,(Without Auto Priming System) | 4 |
| 01***60 | Bolt,(Without Alternator Bracket) | 10 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Cylinder Block : Oil Pan
| 01***22 | Bolt,(Cold Terrain Spec.) | 28 |
| 01***25 | Bolt,(Without Auto Priming System) | 8 |
| 01***30 | Bolt,(Cold Terrain Spec.) | 2 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Cylinder Block : Oil Pan (Cold Terrain Spec.) (Except Japan)(#121772-)
| 01***20 | Bolt,(Forwarded Individually Parts) | 38 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 2 |
| 07***22 | O-Ring,(See Fig.Y1852-01a0) | 1 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Cylinder Block : Piston And Connecting Rod
| 04***18 | Ring, Retaining | 12 |
| 61***40 | Crank Pin Metal A | 6 |
| 61***40 | Crank Pin Metal A | 6 |
Cylinder Head
Komatsu : S6d105-1pp(S/N 81520-Up) : Cylinder Head : Air Cleaner (Sandy And Dusty Spec.)
| 04***10 | Ring,See Fig. K4010-65a0 | 1 |
| 08***01 | Indicator,Dust (Japanese-English) | 1 |
| 09***61 | Plate? Instruction,(Japanese-English) (Not Shown) | 1 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Cylinder Head : Air Cleaner(#81520-92778)
| 04***10 | Ring,See Fig. K4010-65a0 | 1 |
| 08***35 | Indicator,Dust (Japanese-English) | 1 |
| 09***61 | Plate? Instruction,(Japanese-English) (Not Shown) | 1 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Cylinder Head : Air Cleaner(#92779-)
| 08***01 | Indicator,Dust (Japanese-English) | 1 |
| 08***01 | Indicator,Dust Indicator | 1 |
| 09***61 | Plate? Instruction,(Japanese-English) (Not Shown) | 1 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Cylinder Head : Air Intake Manifold And Connection
| 01***50 | Bolt,(For Trimming Dozer) | 2 |
| 01***65 | Bolt,(For Alternator Bracket Mount) | 10 |
| 01***70 | Bolt | 3 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Cylinder Head : Cylinder Head
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 2 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 2 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Cylinder Head : Cylinder Head Cover
| 04***10 | Clip,(See Fig.0311a Or 0321) | 1 |
| 07***23 | Clamp - Hose | 1 |
| 07***30 | Clip | 1 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Cylinder Head : Exhaust Manifold And Turbocharger
| 01***00 | Bolt (M10-1.50x100) | 10 |
| 01***15 | Bolt | 2 |
| 01***00 | Bolt (M10-1.50x100) | 10 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Cylinder Head : Muffler And Mounting(#81520-92778)
| 01***40 | Bolt,(For Position Fixing) | 1 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 4 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Cylinder Head : Muffler And Mounting(#92779-)
| 01***16 | Bolt,(For Slag Handling) | 2 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 6 |
| 01***16 | Bolt | 2 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Cylinder Head : Rocker Arm
| 01***80 | Bolt,(Shim 5 Pieces Over) | 2 |
| 01***06 | Nut, Regular Hexagon (M8-1.25) | 12 |
| 01***36 | Washer,Radio Controlled Slag Handling | 6 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Cylinder Head : Turbocharger
| 61***00 | Turbocharger Ass'Y,(T04b-59) | 1 |
| GA***00 | Clamp | 3 |
| GA***01 | Bolt | 6 |
Electrical System
Komatsu : S6d105-1pp(S/N 81520-Up) : Electrical System : Alternator (25a) (With Hardening Pulley) (Sandy And Dusty Spec.)
| 60***30 | Alternator A. (25a),(With Hardening Pulley) | 1 |
| KD***57 | Bearing,Ball? Front | 1 |
| KD***80 | Collar | 1 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Electrical System : Alternator (25a) (With Non Hardening Pulley)
| 60***30 | Alternator A. (25a),(With Non Hardening Pulley) | 1 |
| KD***57 | Bearing,Ball? Front | 1 |
| KD***70 | Bracket,Front | 1 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Electrical System : Alternator (35a) (With Hardening Pulley) (Cold Terrain Spec.) (Except Japan)
| 60***40 | Alternator A. (35a),(With Hardening Pulley) | 1 |
| KD***57 | Bearing,Ball? Front | 1 |
| KD***80 | Collar | 1 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Electrical System : Alternator (35a) (With Hardening Pulley) (Sandy And Dusty Spec.) (Except Japan)
| 60***40 | Alternator A. (35a),(With Hardening Pulley) | 1 |
| KD***57 | Bearing,Ball? Front | 1 |
| KD***80 | Collar | 1 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Electrical System : Alternator And Mounting (25a) (Bracket Less Type)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***35 | Bolt,(Cold Weather Spec.) | 1 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 1 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Electrical System : Alternator And Mounting (25a) (Bracket Mounting Type) (Sandy And Dusty Spec.)(#92779-)
| 01***45 | Bolt,(For Suction? Reversible Fan) | 1 |
| 01***35 | Bolt,(Cold Weather Spec.) | 1 |
| 01***40 | Bolt,(Shim 3-Piece) | 1 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Electrical System : Alternator And Mounting (25a) (Bracket Mounting Type) (Sandy And Dusty Spec.)(#81520-92778)
| 01***25 | Bolt | 1 |
| 01***70 | Bolt,(With Wear Guard) | 1 |
| 01***35 | Bolt,(Cold Weather Spec.) | 1 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Electrical System : Alternator And Mounting (25a) (Bracket Mounting Type) (Snady And Dusty Spec.)(#92779-)
| 01***45 | Bolt,(For Suction? Reversible Fan) | 1 |
| 01***35 | Bolt,(Cold Weather Spec.) | 1 |
| 01***40 | Bolt,(Shim 3-Piece) | 1 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Electrical System : Alternator And Mounting (35a) (Bracket Mounting Type) (Cold Treeain)
| 01***45 | Bolt,(For Suction? Reversible Fan) | 1 |
| 01***35 | Bolt,(Cold Weather Spec.) | 1 |
| 01***40 | Bolt,(Shim 3-Piece) | 1 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Electrical System : Alternator And Mounting (35a) (Bracket Mounting Type) (Snady And Dusty Spec.)
| 01***45 | Bolt,(For Suction? Reversible Fan) | 1 |
| 01***35 | Bolt,(Cold Weather Spec.) | 1 |
| 01***40 | Bolt,(Shim 3-Piece) | 1 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Electrical System : Heater Switch And Heater Signal
| 60***70 | Switch,Air Intake Heater | 1 |
| 60***71 | Signal,Signal | 1 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Electrical System : Starting Motor (5.5kw)
| 60***90 | Starting Motor Ass'Y,(5.5kw) | 1 |
| 60***91 | Starting Motor Ass'Y,(5.5kw) | 1 |
| KD***30 | Bracket,Center | 1 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Electrical System : Starting Motor (7.5kw) (Cold Terrain Spec.) (Except Japan)
| 60***50 | Starting Motor Ass'Y,(7.5kw) | 1 |
| KD***60 | Shift Lever Assembly | 1 |
| KD***40 | Spring,Spring | 4 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Electrical System : Starting Motor And Mounting (5.5kw)
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 3 |
| 01***30 | Bolt, Mounting - Front Hand Rails | 3 |
| 01***36 | Washer,Radio Controlled Slag Handling | 3 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Electrical System : Starting Motor And Mounting (7.5kw) (Cold Terrain Spec.) (Except Japan)
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 3 |
| 01***30 | Bolt, Mounting - Front Hand Rails | 3 |
| 01***36 | Washer,Radio Controlled Slag Handling | 3 |
Engine Kit
Komatsu : S6d105-1pp(S/N 81520-Up) : Engine Kit : Gasket Kit
| 07***18 | O-Ring,(See Fig.1601-29?1602-17) | 1 |
| 07***70 | O-Ring,(For Intake Air Cover) | 1 |
| 07***00 | O-Ring,(F4350-65a1 -5 ) | 1 |
Fuel System
Komatsu : S6d105-1pp(S/N 81520-Up) : Fuel System : Additional Fuel Filter Cartridge
| 60***21 | Cartridge,Fuel Filter | 1 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Fuel System : Engine Stop Motor And Mounting(#114158-)
| 01***20 | Bolt,See Fig. K4010-11a0 | 3 |
| 01***35 | Bolt,R.H. (For Add. Air Compressor) | 4 |
| 01***95 | Screw | 2 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Fuel System : Fuel Filter And Piping(#81520-92778)
| 01***35 | Bolt, Mounting - Flywheel Housing End | 2 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 2 |
| 01***16 | Washer,Radio Controlled Slag Handling | 2 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Fuel System : Fuel Filter And Piping(#92779-)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 2 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 2 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Fuel System : Fuel Injection Pump (Coupling)
| DK***00 | Bolt | 1 |
| DK***00 | Washer,Lock | 2 |
| DK***00 | Coupling,Cross | 1 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Fuel System : Fuel Injection Pump (Coupling)(#81520-111311)
| DK***00 | Bolt | 1 |
| DK***00 | Washer,Lock | 2 |
| DK***00 | Coupling,Cross | 1 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Fuel System : Fuel Injection Pump (Feed Pump)
| DK***20 | Bolt, Joint | 1 |
| DK***20 | Pump,Priming | 1 |
| DK***20 | Housing | 1 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Fuel System : Fuel Injection Pump (Feed Pump)(#81520-111311)
| DK***20 | Bolt, Joint | 1 |
| DK***20 | Pump,Priming | 1 |
| DK***20 | Housing | 1 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Fuel System : Fuel Injection Pump (Governor) (1/2)
| DK***00 | Adapter | 1 |
| DK***80 | Nut | 1 |
| DK***20 | Lever | 1 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Fuel System : Fuel Injection Pump (Governor) (1/2)(#81520-111311)
| DK***00 | Adapter | 1 |
| DK***80 | Nut | 1 |
| DK***20 | Lever | 1 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Fuel System : Fuel Injection Pump (Governor) (2/2)
| DK***80 | Shim? 0.5mm | 0 |
| DK***00 | Washer,Spring | 1 |
| DK***40 | Gasket,Air Compressor | 2 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Fuel System : Fuel Injection Pump (Governor) (2/2)(#81520-111311)
| DK***80 | Shim? 0.5mm | 0 |
| DK***00 | Washer,Spring | 1 |
| DK***40 | Gasket,Air Compressor | 2 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Fuel System : Fuel Injection Pump (Pump)
| 61***50 | Injection Pump Ass'Y | 1 |
| 61***60 | Injection Pump Ass'Y,(Farming Spec.) | 1 |
| DK***10 | Washer,Spring | 1 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Fuel System : Fuel Injection Pump (Pump)(#81520-111311)
| 61***50 | Injection Pump Ass'Y | 1 |
| 61***60 | Injection Pump Ass'Y,(Farming Spec.) | 1 |
| DK***10 | Washer,Spring | 1 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Fuel System : Fuel Injection Pump And Piping
| 01***70 | Bolt | 4 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 1 |
| 01***30 | Bolt,(For France Noise Suppression) | 1 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Fuel System : Fuel Nozzle And Spill Pipe
| 01***55 | Bolt,(For Trimming Dozer) | 12 |
| 01***55 | Screw | 12 |
| 01***25 | Washer,Spring?(Sandy And Dusty Spec.) | 12 |
Lubricating Oil System
Komatsu : S6d105-1pp(S/N 81520-Up) : Lubricating Oil System : Lubricating Oil Cooler (Cold Terrain Spec.)(#121604-)
| 01***65 | Bolt | 2 |
| 01***20 | Bolt,(Forwarded Individually Parts) | 6 |
| 01***25 | Bolt - Relay Mounting | 4 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Lubricating Oil System : Lubricating Oil Cooler(#81520-92778)
| 01***25 | Bolt,(Without Auto Priming System) | 5 |
| 01***30 | Bolt,(Cold Terrain Spec.) | 3 |
| 01***35 | Bolt,(Without Auto Priming System) | 16 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Lubricating Oil System : Lubricating Oil Cooler(#92779-)
| 01***25 | Bolt,(Without Auto Priming System) | 5 |
| 01***30 | Bolt,(Cold Terrain Spec.) | 3 |
| 01***35 | Bolt,(Without Auto Priming System) | 16 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Lubricating Oil System : Lubricating Oil Filter And Mounting(#81520-92778)
| 01***65 | Bolt,(For Alternator Bracket Mount) | 1 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 7 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 1 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Lubricating Oil System : Lubricating Oil Filter And Mounting(#92779-)
| 01***90 | Bolt | 1 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 1 |
| 01***25 | Bolt (M10x1.50x25) | 1 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Lubricating Oil System : Lubricating Oil Piping(#81520-92778)
| 01***16 | Bolt,(For Slag Handling) | 2 |
| 01***95 | Bolt | 1 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 2 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Lubricating Oil System : Lubricating Oil Pump And Suction Pipe
| 01***25 | Bolt,(Without Auto Priming System) | 3 |
| 01***30 | Bolt,(Cold Terrain Spec.) | 1 |
| 01***45 | Bolt,(S6d155-4b) | 1 |
Komatsu : S6d105-1pp(S/N 81520-Up) : Lubricating Oil System : Turbocharger Lubricating Oil Piping
| 01***22 | Bolt,(Cold Terrain Spec.) | 2 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 2 |
| 01***20 | Bolt,(Forwarded Individually Parts) | 2 |
S6D105-1PP(S/N 81520-UP) serial number reference
The serial number plate for Komatsu equipment is typically located on the right-hand side of the cab on the lower frame, near the front idler or beneath the operator's window. For the S6D105-1PP engine, locate the engine data plate on the left side of the engine block near the injection pump to confirm the engine model and serial number.
| Prefix | Identifies | Notes |
|---|---|---|
| 81520 | S6D105-1PP | Serial number break start for the S6D105-1PP engine. The suffix '-UP' indicates all serial numbers from 81520 onward for this specific engine configuration. No 3-character PIN prefix is explicitly listed in the provided source text for this engine range; the source text only provides the numeric serial break '81520-Up'. Verify with your dealer for the specific 3-character PIN prefix associated with this serial range. |
Frequently asked questions
What engine does the Komatsu S6D105-1PP use?
The Komatsu S6D105-1PP is a six-cylinder, turbocharged diesel engine from the S6D105 series. It features a mechanical fuel system and is designed for mid-size excavators and wheel loaders.
What is the operating weight of machines using this engine?
Machines powered by the S6D105-1PP, such as the PC200-3 and WA320-1, typically have an operating weight ranging from 20,000 to 60,000 lb, depending on the configuration and attachments.
What replaced the S6D105-1PP engine?
The S6D105-1PP was succeeded by the S6D105E-1 series, which incorporates electronic controls and emissions aftertreatment systems to meet modern Tier 4 Final and Stage V regulations.
What S6D105-1PP(S/N 81520-UP) owners discuss
What are the typical powertrain and hydraulic behaviors associated with the Komatsu S6D105-1PP engine series?
The S6D105-1PP is a turbocharged, direct-injection diesel engine delivering approximately 170 horsepower and 550 lb-ft of torque. It is widely used in Komatsu PC200 and PC220 series excavators. The powertrain is characterized by smooth hydraulic operation and high fuel efficiency. However, community consensus notes that if the hydraulic pump fails, the engine often suffers subsequent damage due to the interconnected nature of the load-sensing system. The machine is designed to wear out complete systems simultaneously rather than failing gradually, which can negatively impact resale value if major components are neglected.
What undercarriage and wear patterns are typical for machines powered by this engine?
Machines equipped with the S6D105-1PP (typically PC200/PC220 class) exhibit significant wear on bushings, bearings, and track pads due to continuous load and environmental exposure. Worn bushings lead to increased noise and vibration, while degraded bearings can cause premature track failure. The undercarriage is designed for heavy earthmoving, and track tension must be monitored regularly to prevent loosening. Operators report that mud or debris packed into the undercarriage can cause uneven travel speeds, pulling the machine to one side.
What are the known engine quirks for the S6D105-1PP series?
The S6D105-1PP (Serial No. 81520-Up) is part of the 6D105 series family. A common quirk is sensitivity to air and fuel restrictions; loss of power under heavy digging load often points to clogged air filters, restricted fuel filters, or blocked fuel tank vents rather than internal engine failure. The engine relies on a robust cooling package, and overheating during heavy excavation is frequently caused by material packed between the radiator, hydraulic oil cooler, and charge-air cooler, even if the exterior appears clean. The engine also requires specific Komatsu EO or TO series engine oil and Super-coolant AF-NAC for optimal operation.
What are the common electrical and sensor issues reported by owners?
Owners frequently report intermittent starting, dashboard failures, and random shutdowns linked to unstable power supplies or faulty sensors. The machine relies heavily on electronic control systems, meaning a single sensor failure can trigger multiple warning signals. Common electrical diagnostics involve checking battery state of charge under load, engine and chassis grounds, and main starter cables. Voltage collapse during cranking is a key indicator of battery or ground issues rather than starter failure. Intermittent faults often stem from corroded connectors or loose wiring harnesses in the engine compartment.
What hydraulic behaviors indicate internal leakage or pump wear?
A primary diagnostic pattern is hydraulics working normally when cold but becoming weak when hot. As hydraulic oil warms and viscosity decreases, internal leakage in the main pump, main control valve, or cylinders becomes more pronounced. If all functions (boom, arm, bucket, swing, travel) slow down simultaneously, the issue is likely shared (pump, filter, or oil condition). If only one function is slow, the focus shifts to that specific circuit's control valve, cylinder seals, or load-holding valve. Hydraulic noise or cavitation often indicates low oil level or suction-side restrictions.
What should be checked when buying a used machine with the S6D105-1PP (S/N 81520-Up)?
Verify the exact serial number prefix to confirm the engine model, as the S6D105-1PP (81520-Up) is distinct from earlier 6D105 variants. Check for signs of hydraulic system neglect, as pump failure often damages the engine. Inspect the undercarriage for excessive wear on rollers and track chains, and verify track tension. Test all hydraulic functions cold and hot to detect viscosity-related leakage. Check for black smoke from the exhaust, which may indicate injector wear or airflow restriction. Ensure the cooling package is clean and free of packed debris. Verify that the machine has used Komatsu Genuine fluids and filters to maintain warranty and performance standards.
What is the safety-critical fix for the main safety valve in the hydraulic system?
The main safety valve is critical for the smooth operation of the entire hydraulic system. If the machine exhibits slow heating or erratic hydraulic behavior, the main safety valve may require grinding and repair or replacement. Failure to maintain this valve can lead to system over-pressurization and component failure. Have your dealer verify the valve's condition and perform necessary maintenance to ensure safe operation.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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