Komatsu S6D155-4-R(S/N 10014-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu S6D155-4-R engine powers the D155A-1 and D155A-2 crawler dozer series, a heavy-duty earthmoving class designed for large-scale construction and land clearing. Production years span approximately 1989 to 1995, with the S6D155-4-R specifically covering serial number 10014 and up. The engine delivers 320 hp gross power and displaces 1175 cu in (19.2 L). It is a turbocharged diesel unit used in dozers with operating weights around 59,350 lb (26,943 kg). The D155A series succeeded earlier D155 models and was later replaced by the D155C-1 and D155W-1 series. Configurations included standard dozer, low ground pressure (LGP), and specialized variants for high-altitude or specific terrain applications.
Across the S6D155-4 series generations, key changes involved updates to the engine control system, emissions compliance packages, and serial number breaks that altered component compatibility. The S6D155-4-R (S/N 10014-UP) represents a specific build phase distinct from earlier S6D155-4 units (Eng. No. 20001-24804) and later S6D155-4S units (Eng. No. 52707-Up). This machine matters in the used and parts market because its widespread use in heavy dozers created a large installed base, driving demand for reliable aftermarket components like cylinder heads, injectors, and turbochargers. The transition to the S6D155-4S and subsequent SA6D155-4 engines introduced changes in fuel injection and emissions systems, making accurate serial identification critical for parts buyers and mechanics maintaining these legacy heavy machines.
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 S6D155-4-R(S/N 10014-UP) specifications
Engine
| Model | S6D155-4 |
| Configuration | Turbocharged, 4-cylinder in-line |
| Displacement | 12.840 L (783.5 cu in) |
| Bore | 155.0 mm (6.10 in) |
| Stroke | 170.0 mm (6.69 in) |
| Gross Power | 320 hp (239 kW) @ 1850 rpm |
| Net Power Range | 210-240 hp (156-178 kW) @ 1850 rpm |
Weights
| Operating Weight (D155A-1 Crawler Dozer) | 59,350 lb (26,920 kg) |
| Engine Weight (Approximate) | 2,050 kg (4,519 lb) |
Dimensions
| Transport Length (D155A-1) | 13.6 ft (4.15 m) |
| Transport Width (D155A-1) | 62.6 in (1.59 m) |
| Transport Height (D155A-1) | 13.7 yd (12.5 m) |
| Track Shoe Width (D155A-1) | 22.1 in (561 mm) |
| Ground Pressure (D155A-1) | 11 psi (76 kPa) |
| Engine Length (Approximate) | 1,456 mm (57.3 in) |
| Engine Width (Approximate) | 1,125 mm (44.3 in) |
| Engine Height (Approximate) | 1,910 mm (75.2 in) |
Performance
| Travel Speed (Low) | 7.4 mph (11.9 km/h) |
| Travel Speed (High) | 8.6 mph (13.8 km/h) |
| Blade Capacity (D155A-1) | 13.7 yd³ (10.5 m³) |
| Transmission Type | Planetary gear |
Service capacities (summary)
| Fuel Tank Capacity (D155A-1) | 158.6 gal (600 L) |
| Hydraulic System Capacity (D155A-1) | 43.6 gal (165 L) |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
Komatsu S6D155-4-R(S/N 10014-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 S6D155-4-R(S/N 10014-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
Use KOWA fluid analysis to monitor engine wear metals and hydraulic contamination. Check coolant SCA levels at 500-hour intervals to prevent liner cavitation. Monitor DEF levels daily on Tier 4 variants. Track fuel dilution and soot levels in engine oil to determine optimal drain intervals. Use KOMTRAX telematics to track load frequency and fault codes for proactive service scheduling. Inspect air filter restriction indicators before every shift to ensure proper airflow and prevent turbocharger damage.
Corrective & Common Repairs
Address common S6D155-4-R issues by inspecting fuel injector sleeves and O-rings for leaks. Replace worn turbocharger KTR130-11F bearings if boost pressure drops. Check floating seals on the engine block for oil leaks. Inspect the cylinder head gasket for coolant loss or compression leaks. Replace worn timing case gaskets and oil pan gaskets during routine service. Verify electrical connections for engine speed sensors to prevent fault codes like E10 or E11.
Overhaul & Rebuild Points
Plan inframe overhauls based on KOWA results and compression tests. Replace piston rings, liners, and main bearings when wear exceeds limits. Inspect the crankshaft for journal wear and replace if out of spec. Rebuild the turbocharger if shaft play is detected. Replace all gaskets and seals during cylinder head removal. Use genuine Komatsu or OEM-equivalent gasket kits for accurate torque specifications and sealing.
Seasonal & Environment Servicing
In cold climates, use low-temperature grade engine oil and ensure DEF fluid is protected from freezing. Check battery charge and insulation regularly. In hot environments, clean radiator and oil cooler fins daily to prevent overheating. Inspect coolant hoses for softening or cracking. Use high-temperature grade hydraulic oil if ambient temperatures exceed standard operating ranges. Adjust fuel injection timing if operating at high altitudes to maintain power output.
S6D155-4-R(S/N 10014-UP) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 07281-00197 | Clamp,(With Pre-Fuel Filter) | Fuel system service | Check fitment → |
| 600-311-8282 | Cartridge,Fuel Filter | Fuel system service | Check fitment → |
| 600-311-8283 | Cartridge,Fuel Filter | Fuel system service | Check fitment → |
| 600-311-8331 | Cartridge,Fuel Filter | Fuel system service | Check fitment → |
| 6127-71-6701 | Fuel Filter Ass'Y | Fuel system service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
S6D155-4-R(S/N 10014-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 voltage at the pin connector |
| CA111 | Internal engine controller fault | ECM internal abnormality | 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 |
| CA234 | Engine overspeed | Throttle calibration error, engine load cycle issue, or operator misuse | Verify throttle calibration and engine load cycle |
| CA441 | Battery voltage too low | Alternator failure, battery degradation, or voltage regulator issue | Replace the alternator or battery; check the voltage regulator |
| CA442 | Battery voltage too high | Alternator overcharging or voltage regulator failure | Replace the alternator or battery; check the voltage regulator |
| AA10NX | Air cleaner clogging | Dirty or blocked air filter element | Replace the air filter |
| CA122 | Intake air pressure high voltage | Sensor malfunction or wiring issue | 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 (high voltage) | 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.
S6D155-4-R(S/N 10014-UP) attachments & work tools
Crawler Dozer Blade
The Komatsu D155A-1 and D155A-2 dozers equipped with the S6D155-4 engine utilize a semi-U or U-blade configuration. Factory specifications list a blade capacity of 13.7 cubic yards (10.5 cubic meters) with a blade height of 62.6 inches (1.59 meters). The blade width is 13.6 feet (4.15 meters), designed for heavy-duty land clearing and earthmoving tasks.
Crawler Dozer Ripper
Single-shank or multi-shank ripper attachments are available for the D155A series dozers to break hard rock or compacted soil. The ripper shank length is specified at 22.1 inches (0.56 meters). Mounting points are integrated into the rear frame structure, requiring specific hydraulic lines for depth control and lift functions.
Excavator Bucket
The S6D155-4 engine powers the PC650-5 and PC800-6 excavator classes, which utilize heavy-duty digging buckets. Typical bucket capacities for these machine classes range from 4.0 to 6.0 cubic meters (5.2 to 7.8 cubic yards) depending on material density. The attachment interface uses a standard pin-on coupler system requiring hydraulic quick-attach lines for auxiliary circuits.
Wheel Loader Bucket
The WA350-1 wheel loader, powered by the S6D155-4 engine, is fitted with a general-purpose or rock bucket. Bucket capacities typically range from 3.0 to 4.0 cubic meters (3.9 to 5.2 cubic yards). The loader arm uses a Z-bar linkage with pin-on bucket attachment, requiring dual hydraulic cylinders for tilt and curl functions.
Hydraulic Coupler System
Work tools for the associated excavator and loader classes utilize a pin-on coupler system with integrated hydraulic quick-attach lines. The mounting geometry follows standard Komatsu excavator and loader interface specifications for the respective machine class. Auxiliary hydraulic flow is routed through the quick-attach hoses to operate tool functions such as tilt or rotation.
Factory Guarding Options
Dozer configurations for the D155A series include factory-installed front grille guards and rear guard assemblies to protect the engine and radiator from debris. Cab guards (ROPS/FOPS) are standard on the operator station to meet safety regulations for falling object and rollover protection. Undercarriage guards are available as optional factory configurations for high-abrasion environments.
All S6D155-4-R(S/N 10014-UP) assemblies by section
Every catalogued assembly group for the Komatsu S6D155-4-R(S/N 10014-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Cooling And Electrical System
Komatsu : S6d155-4-R(S/N 10014-Up) : Cooling And Electrical System : Alternator And Mounting (Starting Motor Spec.)(#56577-)
| 01***25 | Bolt,(Rear Attachment Less) | 4 |
| 01***40 | Bolt (Op) | 2 |
| 01***45 | Bolt,(With Water Separator Type) | 3 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Cooling And Electrical System : Alterno\Ator (Starting Motor Spec.)(#56577-)
| 60***40 | Alternator A. (50a) | 1 |
| SD***01 | Cord Ass'Y | 1 |
| SD***00 | Bearing,Ball | 1 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Cooling And Electrical System : Cooling Fan And Fan Drive(#30551-)
| 01***20 | Bolt, Wiring Harness Mounting Bracket | 7 |
| 01***35 | Bolt,(F4320-52a0 -5 ) | 2 |
| 01***30 | Bolt,(Not Used When Towing Winch) | 3 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Cooling And Electrical System : Corrosion Resistor And Piping (Starting Motor Spec.)(#56577-)
| 01***20 | Bolt, Wiring Harness Mounting Bracket | 1 |
| 01***30 | Bolt,(With Body Positioner) | 8 |
| 01***25 | Washer,Spring?(Sandy And Dusty Spec.) | 1 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Cooling And Electrical System : Starting Motor (Starting Motor Spec.)(#56577-)
| 60***41 | Starting Motor Ass'Y,(Extreme Cold Terrain Spec.) | 1 |
| KD***82 | Screw,Dish | 8 |
| KD***60 | Field Coil Ass'Y | 1 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Cooling And Electrical System : Statring Motor And Mounting(#56577-)
| 01***45 | Capscrew - M16 | 3 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 2 |
| 01***25 | Bolt | 2 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Cooling And Electrical System : Water Pump And Piping(#30551-)
| 01***15 | Bolt | 6 |
| 01***16 | Bolt - Box Mounting | 6 |
| 01***20 | Bolt, Wiring Harness Mounting Bracket | 4 |
Cylinder Block
Komatsu : S6d155-4-R(S/N 10014-Up) : Cylinder Block : Alternator Drive(#30557-)
| 01***16 | Bolt - Box Mounting | 6 |
| 01***40 | Bolt,For Weight Adjusting Bolt | 3 |
| 01***10 | Nut,Lock | 1 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Cylinder Block : Camshaft And Tappet(#30551-)
| 01***20 | Bolt,(For Mono Lever Steering) | 2 |
| 04***35 | Key | 1 |
| 61***30 | Plug, No. 4 | 1 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Cylinder Block : Crankshaft And Vibration Damper(#30551-)
| 01***25 | Bolt - Rear Guard Mounting | 6 |
| 01***45 | Bolt,Nylock | 1 |
| 01***36 | Washer,Radio Controlled Slag Handling | 6 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Cylinder Block : Cylinder Block (1/2)(#30551-)
| 01***18 | Bolt | 6 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***35 | Bolt,(F4320-52a0 -5 ) | 3 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Cylinder Block : Cylinder Block (2/2)(#30551-)
| 01***25 | Bolt - Rear Guard Mounting | 1 |
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 2 |
| 01***25 | Bolt,(Rear Attachment Less) | 8 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Cylinder Block : Flywheel And Flywheel Housing(#30551-)
| 01***45 | Bolt, Mount Bracket | 4 |
| 01***45 | Bolt | 8 |
| 01***55 | Bolt | 7 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Cylinder Block : Gear Case And Front Support(#30551-)
| 01***12 | Bolt,(Without R.P.C.U.) | 2 |
| 01***40 | Bolt,(Not Used With Cab) | 2 |
| 01***55 | Screw | 4 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Cylinder Block : Heater (Starting Motor Spec.)(#56577-)
| 01***16 | Bolt,(Sandy And Dusty Spec.) | 1 |
| 01***95 | Bolt,(For Reversible Fan) | 1 |
| 01***30 | Bolt - M8 X 30lg | 5 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Cylinder Block : Oil Pan(#30551-)
| 01***30 | Bolt,(For France Noise Suppression) | 11 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 36 |
| 01***20 | Bolt, Wiring Harness Mounting Bracket | 1 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Cylinder Block : Pistion And Connecting Rod(#30551-)
| 61***20 | Ring,Snap | 2 |
| 61***30 | Piston Ass'Y,(Service Parts) | 6 |
| 61***40 | Piston,(Service Parts) | 1 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Cylinder Block : Power Take Off(#30551-)
| 01***30 | Bolt,Radio Controlled Slag Handling | 12 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 2 |
| 01***20 | Bolt,(For Mono Lever Steering) | 6 |
Cylinder Head
Komatsu : S6d155-4-R(S/N 10014-Up) : Cylinder Head : Air Cleaner And Pre-Cleaner(#30551-)
| 01***45 | Screw | 1 |
| 01***30 | Bolt | 4 |
| 01***08 | Nut, Regular Hexagon (M10-1.50) | 1 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Cylinder Head : Air Intake Manifold And Connection(#30551-)
| 01***35 | Bolt | 4 |
| 01***45 | Hexagon Bolt | 4 |
| 01***30 | Bolt - M8 X 30lg | 4 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Cylinder Head : Compression Release(#30551-)
| 01***30 | Bolt - M8 X 30lg | 1 |
| 01***25 | Washer,Spring?(Sandy And Dusty Spec.) | 1 |
| 04***20 | Key | 1 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Cylinder Head : Cylinder Head(#30551-)
| 01***30 | Bolt,(With Body Positioner) | 6 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 6 |
| 07***20 | Plug | 2 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Cylinder Head : Exhaust Manifold And Muffler(#30551-)
| 01***40 | Bolt,(Dust And Dirt Protection) | 1 |
| 01***25 | Bolt - Rear Guard Mounting | 1 |
| 01***90 | Bolt | 1 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Cylinder Head : Fuel Nozzle And Spill Pipe(#30551-)
| 01***40 | Bolt (Op) | 12 |
| 07***12 | Gasket,Mechanical Pump Piping | 14 |
| 61***12 | Pipe,Fuel Supply | 6 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Cylinder Head : Rocker Arm And Housing(#30551-)
| 01***10 | Bolt, Mount Filler Tube | 2 |
| 01***05 | Capscrew | 22 |
| 01***25 | Washer,Spring?(Sandy And Dusty Spec.) | 1 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Cylinder Head : Rocker Arm Housing Cover(#30551-)
| 01***22 | Capscrew | 3 |
| 01***40 | Screw, Hex Socket | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Cylinder Head : Turbocharger(#30551-)
| 01***30 | Screw | 4 |
| 04***50 | Screw | 2 |
| 07***95 | O-Ring (Kit) | 2 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Cylinder Head : Water Manifold And Thermostat(#30551-)
| 01***30 | Bolt,(With Body Positioner) | 4 |
| 01***35 | Bolt,(F4320-52a0 -5 ) | 8 |
| 01***80 | Bolt,(With Corrosion Resistor) | 2 |
Engine Kit
Komatsu : S6d155-4-R(S/N 10014-Up) : Engine Kit : Gasket Kit(#56577-)
| 01***21 | Washer | 3 |
| 01***12 | Washer,Lock (K2) | 4 |
| 01***08 | Washer (K2) | 1 |
Fuel System
Komatsu : S6d155-4-R(S/N 10014-Up) : Fuel System : Accessory Parts(#57335-)
| 61***20 | Lamp,Aps | 1 |
| 78***00 | Controller Unit A | 1 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Fuel System : Auto Priming System(#57335-)
| 01***30 | Screw | 2 |
| 01***12 | Bolt - Front Cover Mounting | 2 |
| 01***25 | Bolt,(Rear Attachment Less) | 1 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Fuel System : Automatic Timer(#30551-)
| 61***32 | Automatic Timer A | 1 |
| DK***00 | Washer | 1 |
| DK***00 | Flyweight | 2 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Fuel System : Feed Pump(#35072-)
| 02***04 | Plug,(For Shipping) | 1 |
| 61***53 | Injection Pump Ass'Y | 1 |
| 61***32 | Joint,Fuel | 1 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Fuel System : Fuel Fitler(#30551-)
| 01***35 | Bolt,(F4320-52a0 -5 ) | 4 |
| 01***08 | Nut, Regular Hexagon (M10-1.50) | 4 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 4 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Fuel System : Fuel Injection Pump And Piping(#30551-)
| 01***40 | Capscrew | 3 |
| 01***45 | Hexagon Bolt | 1 |
| 01***12 | Bolt - M8 - 1.25 X 12 | 4 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Fuel System : Fuel Injection Pump Drive Service Meter(#30551-)
| 01***30 | Bolt,(Not Used When Towing Winch) | 6 |
| 01***35 | Bolt, Mount Ground Driven Steering Pump | 1 |
| 01***30 | Bolt,(Cold Weather Spec.) | 6 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Fuel System : Fuel Injection Pump(#35072-)
| 61***53 | Injection Pump Ass'Y | 1 |
| DK***30 | Bearing,Roller | 2 |
| DK***30 | Washer | 12 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Fuel System : Governor(#35072-)
| 61***53 | Injection Pump Ass'Y | 1 |
| DK***00 | Gear | 1 |
| DK***70 | Seal,Oil | 1 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Fuel System : Hand Primer(#30551-)
| 66***20 | Body | 1 |
| 66***30 | Nut,Lock | 3 |
| 66***40 | Washer | 1 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Fuel System : Name Plate And Caution Plate(#57335-)
| 61***21 | Plate,Auto Primming System | 2 |
| 61***60 | Plate? Operating,Auto Primming System | 1 |
| 61***91 | Plate? Caution,Auto Primming System | 1 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Fuel System : Nozzle And Holder(#30551-)
| 07***12 | Gasket,Mechanical Pump Piping | 2 |
| 61***04 | Nozzle Holder Ass'Y | 6 |
| 61***33 | Nozzle,Fuel | 1 |
Lubricating Oil System
Komatsu : S6d155-4-R(S/N 10014-Up) : Lubricating Oil System : Bypass Filter (Starting Motor Spec.)(#56577-)
| 01***75 | Bolt - Tube Mounting | 2 |
| 01***15 | Bolt | 2 |
| 01***36 | Washer,Radio Controlled Slag Handling | 4 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Lubricating Oil System : Camshaft Lubricating Oil Piping(#30551-)
| 07***10 | Connector,Pipe | 6 |
| 61***40 | Nozzle,Oil | 12 |
| 61***12 | Pipe,Oil | 2 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Lubricating Oil System : Lubricating Oil Cooler(#30551-)
| 01***20 | Bolt,(For Mono Lever Steering) | 2 |
| 01***30 | Bolt,(With Body Positioner) | 2 |
| 01***35 | Bolt,(F4320-52a0 -5 ) | 19 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Lubricating Oil System : Lubricating Oil Filter Bracket(#30551-)
| 01***70 | Bolt - Bracket And Oil Inlet Tubemounting | 2 |
| 01***40 | Bolt,For Weight Adjusting Bolt | 3 |
| 01***80 | Bolt,For Weight Adjusting Bolt | 2 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Lubricating Oil System : Lubricating Oil Filter(#30551-)
| 01***40 | Bolt,For Weight Adjusting Bolt | 5 |
| 01***85 | Bolt,(Used With Pin Puller) | 3 |
| 01***36 | Washer,Radio Controlled Slag Handling | 8 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Lubricating Oil System : Lubricating Oil Pump(#30551-)
| 01***20 | Bolt,(Large Capacity Type) (Std) | 2 |
| 01***20 | Bolt,(For Mono Lever Steering) | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Lubricating Oil System : Oil Strainer And Piping(#30551-)
| 01***14 | Screw | 2 |
| 01***22 | Capscrew | 3 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 5 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Lubricating Oil System : P.T.O. Lubricating Oil Piping(#30551-)
| 01***22 | Capscrew | 1 |
| 01***30 | Bolt,(With Body Positioner) | 3 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 4 |
Komatsu : S6d155-4-R(S/N 10014-Up) : Lubricating Oil System : Tubrocharger Lubricaiting Oil Piping(#30551-)
| 01***10 | Bolt | 1 |
| 01***35 | Bolt,(For Fix Position) | 2 |
| 01***35 | Bolt,(F4320-52a0 -5 ) | 2 |
S6D155-4-R(S/N 10014-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. Read the 17-character ISO PIN; the first three characters (KMT) identify Komatsu, while positions 4–8 encode the model family and configuration, and position 10 indicates the model year.
| Prefix | Identifies | Notes |
|---|---|---|
| S6D155-4-R | Engine Model | Identifies the S6D155-4-R engine family. Serial range 10014-UP is explicitly listed in the Komatsu S6D155-4-R Parts Catalog and Operation and Maintenance Manual. The engine is a 6-cylinder, turbocharged, water-cooled diesel. Source: Komatsu S6D155-4-R Parts Catalog, Operation and Maintenance Manual. Confirm with dealer for specific machine application (e.g., D155A-1 dozer). Single-source confirmation for the exact 'R' suffix prefix range; verify with dealer. |
Frequently asked questions
What is the engine model for the Komatsu D155A-1 dozer?
The Komatsu D155A-1 dozer uses the S6D155-4 turbocharged diesel engine, producing 320 hp gross power.
What is the operating weight of the Komatsu D155A-1?
The operating weight of the Komatsu D155A-1 is approximately 59,350 lb (26,943 kg), varying by configuration and attachments.
What replaced the Komatsu D155A-1 series?
The D155A-1 series was succeeded by the D155C-1 and D155W-1 crawler dozer models, which featured updated engines and emissions systems.
What S6D155-4-R(S/N 10014-UP) owners discuss
What is the net horsepower rating for the Komatsu S6D155-4 engine in the D155A-1 dozer configuration?
What are the common hydraulic behaviors and failure patterns associated with the Komatsu S6D155-4 engine platform?
What undercarriage and wear patterns are typical for machines powered by the S6D155-4, such as the D155A series?
What electrical and sensor issues are frequently reported for Komatsu equipment using this engine series?
What are the known engine quirks and maintenance priorities for the S6D155-4 series?
What fluids are specified for the Komatsu S6D155-4 engine and associated systems?
What should be checked when buying a used machine with the S6D155-4 engine (S/N 10014-UP)?
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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