Komatsu S6D105-1ZZ(S/N 91468-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu S6D105-1ZZ engine (S/N 91468-UP) is a six-cylinder, turbocharged diesel powerplant belonging to the S6D105 series. It is primarily fitted to Komatsu GD530A/AW motor graders (the OEM part reference-Up) and certain PC200-3/PC200LC-3 excavators. The engine delivers approximately 170 hp (127 kW) and 550 lb-ft (745 Nm) of torque. It operates within a weight class range of 9,182 to 87,083 lb depending on the host machine configuration. The S6D105-1ZZ succeeded earlier S6D105-1 variants and was eventually replaced by the S6D105-1E and S6D105-1C series as emissions standards tightened. Configurations offered include mechanical fuel systems and various turbocharger setups tailored for grading and excavation duties.
Across the S6D105 generation, changes focused on refining fuel injection precision and integrating electronic monitoring while retaining mechanical robustness. The S6D105-1ZZ remains significant in the used and parts market because it powers high-volume, durable machines like the GD530A grader and PC200-3 excavator. Its widespread use ensures a strong aftermarket supply of cylinder kits, piston sets, and gaskets. The engine's mechanical simplicity compared to newer electronic-only designs makes it a preferred candidate for rebuilds and inframe overhauls, sustaining its value in the secondary market.
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 S6D105-1ZZ(S/N 91468-UP) specifications
Engine
| Model | S6D105-1ZZ |
| Series | S6D105 Series |
| Displacement | 6.5 L (396 cu. in.) |
| Cylinders | 6 |
| Aspiration | Turbocharged |
| Fuel System | Direct injection |
| Gross Power | 170 hp (127 kW) |
| 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 |
| Dig Depth | Not documented for this exact serial range — verify with your dealer |
| Lift Capacity | Not documented for this exact serial range — verify with your dealer |
Service capacities (summary)
| Engine Oil Refill 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 |
| Hydraulic 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 |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
Komatsu S6D105-1ZZ(S/N 91468-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 S6D105-1ZZ(S/N 91468-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize KOWA fluid analysis at every major service interval to monitor wear metals (iron, copper, lead, aluminum) and contaminants (silicon, sodium) in the S6D105-1ZZ engine oil. Check hydraulic fluid particle count and viscosity to detect pump wear early. Test coolant pH, SCA concentration, and glycol content to prevent corrosion in the engine block. Monitor DEF levels daily on Tier 4 applications to ensure SCR system efficiency. Track KOMTRAX telematics data for load frequency and fault codes to anticipate component failures before they cause downtime.
Corrective & Common Repairs
Address intermittent starting or random shutdowns by inspecting the engine controller power supply and sensor wiring on the S6D105-1ZZ. Replace worn fuel injectors if power loss or excessive fuel usage occurs. Fix hydraulic hose cracks and leaks during daily walk-arounds to prevent fluid loss. Replace air filter elements when the restriction indicator triggers. Inspect and replace worn belts and clamps during the 2,000-hour service. Check for coolant leaks around the water pump and thermostat housing, common failure points in this series.
Overhaul & Rebuild Points
Perform inframe overhauls on the S6D105-1ZZ using piston kits (e.g., 6137-32-2130) and ring sets when compression drops or oil consumption increases. Replace cylinder liners and bearings during major rebuilds. Inspect the turbocharger for shaft play and seal leaks at the 1,000-hour interval. Check valve clearances and adjust if necessary to maintain performance. Replace the cylinder head gasket if coolant contamination or combustion gas leakage is detected. Ensure all fasteners are torqued to factory specifications during reassembly.
Seasonal & Environment Servicing
Select engine oil viscosity based on ambient temperature charts in the Operation and Maintenance Manual to ensure proper lubrication in extreme cold or heat. Check the cooling system for debris buildup in the radiator and oil cooler fins before winter or dusty seasons. Drain the fuel water separator daily in humid or cold conditions to prevent freezing. Inspect the air intake system for dust accumulation in arid environments. Verify battery charge and terminal condition in cold weather to ensure reliable starting. Flush the cooling system annually to remove sediment and maintain heat exchange efficiency.
S6D105-1ZZ(S/N 91468-UP) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 07281-00197 | Clamp,(With Pre-Fuel Filter) | Fuel system 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 → |
| 6136-61-2290 | Gasket,Oil Cooler Element | Lubrication service | Check fitment → |
| 600-651-1411 | Element,Oil Cooler | Lubrication service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
S6D105-1ZZ(S/N 91468-UP) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| CA115 | Engine crankshaft speed sensor and backup 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 failure or corruption | Replace or reprogram the ECM |
| CA451 | Common rail pressure sensor feedback value too high | Malfunction in the rail sensor or actual overpressure condition | Diagnose the fuel rail pressure sensor or pump lines |
| CA441 | Battery voltage too low | Weak battery or charging system failure | Replace the battery or alternator and check the voltage regulator |
| CA442 | Battery voltage too high | Alternator overcharging or regulator failure | Replace the alternator or battery and check the voltage regulator |
| CA234 | Engine overspeed | Throttle calibration error, engine load cycle issue, or operator misuse | Verify throttle calibration and engine load cycle |
| CA122 | Intake air pressure sensor feedback voltage too high | Sensor malfunction or wiring issue | Verify the intake pressure sensor and wiring |
| CA123 | Intake air pressure sensor feedback voltage too low | Sensor short or airflow restriction | Check for a sensor short or an airflow restriction |
| CA153 | Intake air temperature sensor feedback voltage too high | Sensor malfunction | Replace or test the IAT sensor |
| CA154 | Intake air temperature sensor feedback voltage too low | Sensor malfunction | Replace or test the IAT sensor |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
S6D105-1ZZ(S/N 91468-UP) attachments & work tools
Crawler Excavator Attachments
The S6D105-1ZZ engine (S/N 91468-Up) powers the GD530A/AW-2A/2B/2C motor grader series, not a crawler excavator. Excavator applications for the S6D105-1ZZ are not documented in the provided sources; excavator models like the PC200-3 utilize the S6D105-B-1 engine variant.
Motor Grader Blade Configurations
The GD530A/AW-2A/2B/2C series utilizes a moldboard blade with a typical width of 3.7 meters (12 ft 2 in) to 4.0 meters (13 ft 1 in) for this class. The blade is mounted via a standard grader circle or A-frame hitch system, allowing for 360-degree rotation and lateral shift.
Motor Grader Ripper/Scarifier
Rear-mounted ripper or scarifier attachments are available for the GD530A/AW-2A/2B/2C series to break hard ground. These tools are hydraulically controlled and mounted to the rear frame, requiring auxiliary hydraulic lines from the main valve to operate the lift and depth cylinders.
Hydraulic System Requirements
Work tools requiring hydraulic power utilize Komatsu hydraulic oil (HO) or equivalent. The engine drives the main hydraulic pump, which supplies flow to the grader circle, blade cylinders, and optional rear ripper circuits. Fluid capacity and pressure ratings vary by specific machine configuration.
Engine Guarding and Options
Factory configurations for the GD530A/AW-2A/2B/2C series include standard engine guarding such as heavy-duty air filters and oil coolers suitable for dusty environments. Specific guarding options like extended life coolant (ELC) or specialized exhaust systems are determined by the machine's emission tier and operating region.
All S6D105-1ZZ(S/N 91468-UP) assemblies by section
Every catalogued assembly group for the Komatsu S6D105-1ZZ(S/N 91468-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Accessory
Komatsu : S6d105-1zz(S/N 91468-Up) : Accessory : Air Compressor
| 61***20 | Air Compressor Ass'Y | 1 |
| DK***20 | Connecting Rod A | 1 |
| DK***00 | Bearing | 2 |
Komatsu : S6d105-1zz(S/N 91468-Up) : Accessory : Air Compressor And Mounting
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***95 | Bolt,(For Reversible Fan) | 2 |
Komatsu : S6d105-1zz(S/N 91468-Up) : Accessory : Air Compressor Piping
| 07***12 | Gasket,(Without Air Compressor Type) (K1) | 6 |
| 07***16 | Gasket,Air Compressor Piping | 1 |
| 07***15 | Plug,(Used When Without Heater) | 1 |
Cooling System
Komatsu : S6d105-1zz(S/N 91468-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 : S6d105-1zz(S/N 91468-Up) : Cooling System : Water Pump And Cooling Fan
| 01***16 | Bolt,(For Slag Handling) | 2 |
| 01***30 | Bolt,(Cold Terrain Spec.) | 3 |
| 01***55 | Bolt,(For Suction? Reversible Fan) | 2 |
Cylinder Block
Komatsu : S6d105-1zz(S/N 91468-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 : S6d105-1zz(S/N 91468-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 : S6d105-1zz(S/N 91468-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 : S6d105-1zz(S/N 91468-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 : S6d105-1zz(S/N 91468-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 : S6d105-1zz(S/N 91468-Up) : Cylinder Block : Oil Pan
| 01***12 | Bolt,(Without R.P.C.U.) | 3 |
| 01***22 | Bolt,(Cold Terrain Spec.) | 28 |
| 01***25 | Bolt,(Without Auto Priming System) | 8 |
Komatsu : S6d105-1zz(S/N 91468-Up) : Cylinder Block : Piston And Connecting Rod
| 04***18 | Ring, Retaining | 12 |
| 61***40 | Crank Pin Metal A | 6 |
| 61***02 | Connecting Rod Ass'Y,(B) | 6 |
Cylinder Head
Komatsu : S6d105-1zz(S/N 91468-Up) : Cylinder Head : Air Cleaner
| 08***01 | Indicator,Dust (Japanese-English) | 1 |
| 08***01 | Indicator,Dust Indicator | 1 |
| 09***61 | Plate? Instruction,(Japanese-English) (Not Shown) | 1 |
Komatsu : S6d105-1zz(S/N 91468-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 : S6d105-1zz(S/N 91468-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 : S6d105-1zz(S/N 91468-Up) : Cylinder Head : Cylinder Head Cover
| 07***23 | Clamp - Hose | 1 |
| 07***00 | Clip | 1 |
| 07***30 | Clip | 1 |
Komatsu : S6d105-1zz(S/N 91468-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 : S6d105-1zz(S/N 91468-Up) : Cylinder Head : Muffler And Mounting
| 01***16 | Bolt,(For Slag Handling) | 2 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 2 |
| 01***16 | Bolt, Mount Solenoid Valve | 2 |
Komatsu : S6d105-1zz(S/N 91468-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 : S6d105-1zz(S/N 91468-Up) : Cylinder Head : Turbocharger
| 61***00 | Turbocharger Ass'Y,(T04b-59) | 1 |
| GA***00 | Clamp | 3 |
| GA***01 | Bolt | 6 |
Electrical System
Komatsu : S6d105-1zz(S/N 91468-Up) : Electrical System : Alternator (35a)
| 60***20 | Alternator A. (35a) | 1 |
| KD***57 | Bearing,Ball? Front | 1 |
| KD***80 | Collar | 1 |
Komatsu : S6d105-1zz(S/N 91468-Up) : Electrical System : Alternator And Mounting (35a)
| 01***45 | Bolt,(For Suction? Reversible Fan) | 1 |
| 01***35 | Bolt,(Cold Weather Spec.) | 1 |
| 01***40 | Bolt,(Shim 3-Piece) | 1 |
Komatsu : S6d105-1zz(S/N 91468-Up) : Electrical System : Starting Motor (7.5kw)
| 60***50 | Starting Motor Ass'Y,(7.5kw) | 1 |
| KD***60 | Shift Lever Assembly | 1 |
| KD***40 | Spring,Spring | 4 |
Komatsu : S6d105-1zz(S/N 91468-Up) : Electrical System : Starting Motor And Mounting (7.5kw)
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 3 |
| 01***30 | Bolt, Mounting - Front Hand Rails | 3 |
| 01***36 | Washer,Radio Controlled Slag Handling | 3 |
Engine Kit
Komatsu : S6d105-1zz(S/N 91468-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 : S6d105-1zz(S/N 91468-Up) : Fuel System : Fuel Filter And Piping
| 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 : S6d105-1zz(S/N 91468-Up) : Fuel System : Fuel Injection Pump (Coupling)
| DK***00 | Bolt | 1 |
| DK***00 | Washer,Lock | 2 |
| DK***00 | Coupling,Cross | 1 |
Komatsu : S6d105-1zz(S/N 91468-Up) : Fuel System : Fuel Injection Pump (Feed Pump)
| DK***20 | Bolt, Joint | 1 |
| DK***20 | Pump,Priming | 1 |
| DK***20 | Housing | 1 |
Komatsu : S6d105-1zz(S/N 91468-Up) : Fuel System : Fuel Injection Pump (Governor) (1/2)
| DK***00 | Adapter | 1 |
| DK***00 | Governor Ass'Y | 1 |
| DK***80 | Nut | 1 |
Komatsu : S6d105-1zz(S/N 91468-Up) : Fuel System : Fuel Injection Pump (Governor) (2/2)
| DK***80 | Shim? 0.5mm | 0 |
| DK***00 | Washer,Spring | 1 |
| DK***00 | Spring | 1 |
Komatsu : S6d105-1zz(S/N 91468-Up) : Fuel System : Fuel Injection Pump (Pump)
| 61***30 | Injection Pump Ass'Y | 1 |
| DK***10 | Washer,Spring | 1 |
| DK***30 | Bearing | 0 |
Komatsu : S6d105-1zz(S/N 91468-Up) : Fuel System : Fuel Injection Pump And Piping
| 01***70 | Bolt | 4 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 2 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 5 |
Komatsu : S6d105-1zz(S/N 91468-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 : S6d105-1zz(S/N 91468-Up) : Lubricating Oil System : Lubricating Oil Cooler
| 01***25 | Bolt,(Without Auto Priming System) | 4 |
| 01***30 | Bolt,(Cold Terrain Spec.) | 4 |
| 01***35 | Bolt,(Without Auto Priming System) | 15 |
Komatsu : S6d105-1zz(S/N 91468-Up) : Lubricating Oil System : Lubricating Oil Filter And Mounting
| 01***95 | Bolt | 1 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 1 |
| 01***25 | Bolt (M10x1.50x25) | 1 |
Komatsu : S6d105-1zz(S/N 91468-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 : S6d105-1zz(S/N 91468-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 |
S6D105-1ZZ(S/N 91468-UP) serial number reference
The PIN plate is riveted to the right-hand side of the cab on the lower frame, typically just behind the front idler or beneath the operator's window. The prefix is the model code (e.g., GD530A) found on the plate, followed by the serial number range.
| Prefix | Identifies | Notes |
|---|---|---|
| GD530A/AW-2A/2B/2C | Motor Grader / Wheel Loader | S6D105-1ZZ engine fitted to GD530A/AW-2A/2B/2C models from serial 202002-Up. Also listed for GD530A/AW-2B/2C from 203163-Up. |
Frequently asked questions
What engine does the Komatsu S6D105-1ZZ (S/N 91468-UP) use?
It uses the Komatsu S6D105-1ZZ, a six-cylinder, turbocharged, direct-injection diesel engine delivering approximately 170 hp (127 kW) and 550 lb-ft (745 Nm) of torque.
What is the operating weight of machines using this engine?
Operating weight varies by configuration and host machine. For the GD530A/AW motor grader (S/N the OEM part reference-Up) and PC200-3/PC200LC-3 excavators, weights range from approximately 9,182 lb to 87,083 lb depending on attachments and counterweights.
What replaced the Komatsu S6D105-1ZZ engine?
The S6D105-1ZZ was succeeded by the S6D105-1E and S6D105-1C series engines as Komatsu updated its powertrain lineup to meet stricter emissions standards and improve performance.
What S6D105-1ZZ(S/N 91468-UP) owners discuss
What are the known powertrain and hydraulic behaviors for the Komatsu S6D105-1ZZ engine series?
What undercarriage and wear patterns are typical for machines equipped with this engine?
What are the specific quirks or maintenance requirements for the S6D105-1ZZ engine series?
What are the common electrical and sensor issues reported for this machine type?
What should be checked when buying a used machine with the S6D105-1ZZ engine (S/N 91468-Up)?
How does the S6D105-1ZZ engine differ from related variants like the S6D102E-1?
What are the fluid specifications and capacities for the S6D105-1ZZ engine?
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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