Komatsu S6D155-4J(S/N 22144-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu S6D155-4J engine (S/N 22144-UP) is a turbocharged, six-cylinder diesel powerplant designed for heavy-duty construction applications. It primarily powers the D155A and D155W crawler dozer series, which are large earthmoving machines with operating weights ranging from approximately 59,350 lbs (26,943 kg) to 87,083 lbs (39,474 kg) depending on configuration. Production for this engine series spans the late 1980s through the mid-1990s. It succeeded earlier 155-series designs and was eventually replaced by the S6D170E-2A and S6D170-1L engines in subsequent dozer generations. Configurations included standard and high-altitude variants, with gross power outputs reaching 320 hp (239 kW).
Across its production life, the S6D155-4J evolved through Build 14A revisions, incorporating updates to fuel injection and emissions compliance to meet evolving Tier 4 and Stage III standards. The machine remains significant in the used and parts market due to its robust cast-iron block and widespread use in heavy grading and mining. Its longevity has created a strong aftermarket for overhaul kits, cylinder liners, and undercarriage components. The S6D155-4J is often sought for remanufacturing projects because its modular design allows for cost-effective in-frame and out-of-frame rebuilds, keeping older D155 series dozers operational longer than many competitors.
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 S6D155-4J(S/N 22144-UP) specifications
Engine
| Model | S6D155-4J |
| Series | 155-4 Series |
| Gross Power | 320 hp (239 kW) |
| Net Power | 210-240 hp (156-178 kW) @ 1850 rpm |
| Displacement | 12.840 L (783.6 cu in) |
| Cylinders | 6 |
| Arrangement | In-line, turbocharged |
| Bore | 155.0 mm (6.10 in) |
| Stroke | 170.0 mm (6.69 in) |
| Emissions Tier | Tier 4 Final / EU Stage V |
Weights
| Operating Weight | 59,350 lb (26,920 kg) |
| Engine Weight | approx. 2,050 kg (4,520 lb) |
Dimensions
| Engine Length | approx. 1,456 mm (57.3 in) |
| Engine Width | approx. 1,125 mm (44.3 in) |
| Engine Height | approx. 1,910 mm (75.2 in) |
| Transport Length | 13.6 ft in (4.14 m) |
| Transport Width | 62.6 in (1.59 m) |
| Ground Clearance | 13.7 yd3 (Note: Source lists '13.7yd3' in dimension sequence; likely refers to bucket capacity or is a data error for clearance. Omitted due to unit mismatch with standard clearance metrics.) |
Performance
| Travel Speed Low | 7.4 mph (11.9 km/h) |
| Travel Speed High | 8.6 mph (13.8 km/h) |
| Ground Pressure | 11 psi (76 kPa) |
| Bucket Capacity | 13.7 yd3 (10.5 m3) |
| Track Shoe Width | 22.1 in (561 mm) |
Service capacities (summary)
| Fuel Tank Capacity | 158.6 gal (600 L) |
| Hydraulic System Capacity | 43.6 gal (165 L) |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
Komatsu S6D155-4J(S/N 22144-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 S6D155-4J(S/N 22144-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize KOWA fluid analysis at every 500-hour interval to monitor wear metals like iron and copper in the S6D155-4J engine oil. Check coolant pH and SCA concentration to prevent scaling in the cylinder head. Monitor hydraulic oil particle count and viscosity to detect pump wear early. Track DEF levels and KDPF differential pressure to manage emissions system efficiency. Analyze transmission oil for gear wear indicators. Use KOMTRAX telematics to correlate load frequency with fluid degradation rates for optimized change intervals.
Corrective & Common Repairs
Address frequent S6D155-4J issues by inspecting the turbocharger KTR130-11F for shaft play and seal leaks. Replace worn piston rings and cylinder liners to restore compression and reduce oil consumption. Check the fuel injection pump for leakage and timing drift. Inspect the water pump impeller and housing for erosion. Replace cracked hydraulic hoses and worn swing bearing pins. Repair or replace faulty engine sensors and EPC system components to resolve fault codes related to fuel pressure and temperature.
Overhaul & Rebuild Points
Perform in-frame overhaul at 15,000–20,000 hours or when compression drops below specification. Replace pistons, rings, liners, and main/rod bearings. Inspect the crankshaft for journal wear and replace if out of tolerance. Recondition or replace the camshaft and valve train components. During out-of-frame rebuilds, inspect the cylinder head for cracks and resurface if necessary. Replace all gaskets, seals, and O-rings. Verify turbocharger clearance and replace if efficiency is compromised. Reassemble with precise torque specifications for the S6D155-4J block.
Seasonal & Environment Servicing
In cold climates, use low-viscosity Komatsu EO engine oil and ensure the coolant mixture provides adequate freeze protection. Pre-heat the engine block and oil pan before starting in sub-zero temperatures. In dusty environments, service the air filter more frequently and inspect the pre-cleaner. In high-altitude applications, verify turbocharger performance and adjust fuel injection timing if power loss occurs. Protect the undercarriage from mud and debris buildup to prevent track tension issues. Drain water from the fuel separator daily in humid conditions to prevent microbial growth.
S6D155-4J(S/N 22144-UP) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 07281-00197 | Clamp,(With Pre-Fuel Filter) | Fuel system service | Check fitment → |
| 600-311-8291 | Cartridge,Fuel Filter | Fuel system service | Check fitment → |
| 6631-51-5000 | Oil Filter Ass'Y | Lubrication service | Check fitment → |
| 6127-51-5401 | Oil Filter Ass'Y | Lubrication service | Check fitment → |
| 6127-61-2971 | 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.
S6D155-4J(S/N 22144-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 |
| CA441 | Battery voltage too low | Weak battery or charging system fault | 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 |
| CA122 | Intake air pressure sensor feedback voltage too high | Sensor malfunction or wiring short | 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 |
| 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 |
| CA452 | Common rail pressure sensor feedback value too low | Sensor malfunction or fuel supply issue | Diagnose the fuel rail pressure sensor or pump lines |
| CA234 | Engine overspeed | Throttle calibration error, engine load cycle issue, or operator misuse | Verify throttle calibration, engine load cycle, or operator misuse |
| AA10NX | Air cleaner clogging | Dirty or blocked air filter element | Replace the air filter |
| B@BCNS | Engine coolant overheating | Low coolant level, blocked radiator, or fan belt failure | Check radiator fins, fan belt, and coolant level |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
S6D155-4J(S/N 22144-UP) attachments & work tools
Bulldozer Blade Configurations
The Komatsu D155W-1, equipped with the S6D155-4J engine (S/N 22144-UP), is fitted with a semi-universal blade. Factory specifications list the blade width at 4.13 m (13.6 ft) and the bucket capacity at 10.5 m³ (13.7 yd³). The blade height is specified at 1.59 m (62.6 in) with a cut height of 0.55 m (22.1 in).
Dozer Undercarriage & Ground Engagement
The D155W-1 utilizes a track shoe width of 546 mm (21.5 in) and a track gauge of 3.96 m (13.0 ft). The machine operates on a planetary gear final drive system with 3 speeds forward and 3 speeds reverse, achieving travel speeds of 11.9 km/h (7.4 mph) and 13.8 km/h (8.6 mph).
Engine Power & Performance
The S6D155-4J engine is a turbocharged 6-cylinder diesel unit with a displacement of 19.2 L (1175 cu in). It generates a gross power output of 239 kW (320 hp) at 1800 rpm. The engine is associated with the D155A-1 and D155W-1 dozer models in the 155 series.
Fluid Capacities & Specifications
The D155W-1 has a fuel tank capacity of 600 L (158.6 gal) and a hydraulic system capacity of 165 L (43.6 gal). Komatsu engineering standards recommend Komatsu EO, TO, and AXO fluids for engine, hydraulic, and powertrain applications respectively, with Super-coolant AF-NAC for the cooling system.
Machine Weight & Dimensions
The operating weight of the D155W-1 is 26,920 kg (59,350 lb). The machine dimensions include a transport length of 8.38 m (27.5 ft) and a transport height of 3.48 m (11.4 ft). The counterweight is integrated into the rear frame structure.
All S6D155-4J(S/N 22144-UP) assemblies by section
Every catalogued assembly group for the Komatsu S6D155-4J(S/N 22144-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Accessory
Komatsu : S6d155-4j(S/N 22144-Up) : Accessory : Air Compressor
| 02***22 | Bolt | 2 |
| 02***70 | Bolt | 4 |
| 02***32 | Bolt,(With Joy Stick Steering) | 6 |
Komatsu : S6d155-4j(S/N 22144-Up) : Accessory : Air Compressor Drive
| 01***30 | Bolt,(Cold Terrain Spec.) | 2 |
| 01***50 | Bolt | 2 |
| 01***60 | Bolt (M10-1.50x60) | 3 |
Komatsu : S6d155-4j(S/N 22144-Up) : Accessory : Air Compressor Piping
| 01***16 | Bolt,(For Slag Handling) | 1 |
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***80 | Bolt,(See Fig.0131) | 2 |
Komatsu : S6d155-4j(S/N 22144-Up) : Accessory : Air Governor
| 38***-1 | Screw,Adjusting | 1 |
| 38***-1 | Seat,Spring | 2 |
| 38***-1 | Guide,Spring | 1 |
Cooling And Electrical Systems
Komatsu : S6d155-4j(S/N 22144-Up) : Cooling And Electrical Systems : Alternator (20a)
| 60***60 | Alternator A. (20a) | 1 |
| KD***00 | Collar | 1 |
| KD***31 | Rectifier Ass'Y | 1 |
Komatsu : S6d155-4j(S/N 22144-Up) : Cooling And Electrical Systems : Alternator (35a)
| 60***60 | Alternator A. (35a),(Cold Weather Spec.) | 1 |
| KD***00 | Collar | 1 |
| KD***72 | Bracket,Rear | 1 |
Komatsu : S6d155-4j(S/N 22144-Up) : Cooling And Electrical Systems : Alternator (40a) (Extreme Cold Terrain Spec.)
| 60***10 | Alternator A. (40a) | 1 |
| KD***70 | Sheet | 2 |
| KD***00 | Collar | 1 |
Komatsu : S6d155-4j(S/N 22144-Up) : Cooling And Electrical Systems : Alternator And Mounting (20a? 35a? 40a)
| 01***85 | Bolt | 2 |
| 01***20 | Bolt | 1 |
| 01***40 | Bolt,(Cold Weather Spec.) | 1 |
Komatsu : S6d155-4j(S/N 22144-Up) : Cooling And Electrical Systems : Cooling Fan And Fan Drive
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 7 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 2 |
Komatsu : S6d155-4j(S/N 22144-Up) : Cooling And Electrical Systems : Corrosion Resistor And Piping
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***30 | Bolt,(For France Noise Suppression) | 8 |
| 01***25 | Washer,Spring?(Sandy And Dusty Spec.) | 1 |
Komatsu : S6d155-4j(S/N 22144-Up) : Cooling And Electrical Systems : Starting Motor (11kw)
| 60***61 | Starting Motor A.,(11kw) | 1 |
| KD***82 | Screw,Dish | 8 |
| KD***60 | Field Coil Ass'Y | 1 |
Komatsu : S6d155-4j(S/N 22144-Up) : Cooling And Electrical Systems : Starting Motor And Mounting (11kw)
| 01***25 | Bolt - Rear Guard Mounting | 2 |
| 01***50 | Bolt, Radiator To Frame | 3 |
| 01***25 | Bolt | 2 |
Komatsu : S6d155-4j(S/N 22144-Up) : Cooling And Electrical Systems : Water Pump And Piping
| 01***16 | Bolt (Welded) | 6 |
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***45 | Bolt,(S6d155-4b) | 1 |
Cylinder Block
Komatsu : S6d155-4j(S/N 22144-Up) : Cylinder Block : Camshaft And Tappet
| 04***35 | Key | 1 |
| 61***30 | Plug, No. 4 | 1 |
| 61***02 | Camshaft Ass'Y | 1 |
Komatsu : S6d155-4j(S/N 22144-Up) : Cylinder Block : Crankshaft And Vibration Damper
| 01***25 | Bolt - Rear Guard Mounting | 6 |
| 01***36 | Washer,Radio Controlled Slag Handling | 6 |
| 04***40 | Key | 1 |
Komatsu : S6d155-4j(S/N 22144-Up) : Cylinder Block : Cylinder Block
| 01***18 | Bolt | 6 |
| 01***25 | Bolt,(Without Auto Priming System) | 24 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 2 |
Komatsu : S6d155-4j(S/N 22144-Up) : Cylinder Block : Flywheel And Flywheel Housing
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 8 |
| 01***30 | Bolt,(For France Noise Suppression) | 12 |
| 01***45 | Bolt, Mount Bracket | 4 |
Komatsu : S6d155-4j(S/N 22144-Up) : Cylinder Block : Gear Case And Front Support
| 01***12 | Bolt,(Without R.P.C.U.) | 2 |
| 01***90 | Bolt (M10-1.50x90) | 8 |
| 01***40 | Bolt,(Not Used With Cab) | 6 |
Komatsu : S6d155-4j(S/N 22144-Up) : Cylinder Block : Oil Pan(#22144-23360)
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***25 | Bolt,(Without Auto Priming System) | 2 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 10 |
Komatsu : S6d155-4j(S/N 22144-Up) : Cylinder Block : Oil Pan(#23361-28423)
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***25 | Bolt,(Without Auto Priming System) | 2 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
Komatsu : S6d155-4j(S/N 22144-Up) : Cylinder Block : Oil Pan(#28424-)
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***25 | Bolt,(Without Auto Priming System) | 2 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
Komatsu : S6d155-4j(S/N 22144-Up) : Cylinder Block : Piston And Connecting Rod
| 61***20 | Ring,Snap | 2 |
| 61***12 | Piston Ass'Y | 6 |
| 61***30 | Piston Ass'Y,(Service Parts) | 6 |
Komatsu : S6d155-4j(S/N 22144-Up) : Cylinder Block : Power Take Off
| 01***20 | Bolt,(Large Capacity Type) (Std) | 6 |
| 01***30 | Bolt,(For France Noise Suppression) | 6 |
| 01***30 | Bolt,Radio Controlled Slag Handling | 6 |
Cylinder Head
Komatsu : S6d155-4j(S/N 22144-Up) : Cylinder Head : Air Cleaner And Connection
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***30 | Bolt,(For Center Guard) | 4 |
| 01***08 | Nut, Regular Hexagon (M10-1.50) | 8 |
Komatsu : S6d155-4j(S/N 22144-Up) : Cylinder Head : Air Intake Manifold And Connection
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***85 | Bolt, Control Valve Mounting | 12 |
Komatsu : S6d155-4j(S/N 22144-Up) : Cylinder Head : Compression Release
| 01***30 | Bolt,(Cold Terrain Spec.) | 1 |
| 01***35 | Bolt,(Without Auto Priming System) | 1 |
| 01***25 | Washer,Spring?(Sandy And Dusty Spec.) | 1 |
Komatsu : S6d155-4j(S/N 22144-Up) : Cylinder Head : Cylinder Head
| 01***30 | Bolt,(For France Noise Suppression) | 6 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 6 |
| 07***20 | Plug | 2 |
Komatsu : S6d155-4j(S/N 22144-Up) : Cylinder Head : Exhaust Manifold And Turbocharger
| 01***10 | Bolt | 18 |
| 01***70 | Bolt | 2 |
| 01***90 | Bolt | 2 |
Komatsu : S6d155-4j(S/N 22144-Up) : Cylinder Head : Rocker Arm And Housing
| 01***05 | Bolt (Kit) | 22 |
| 01***10 | Bolt, Mount Filler Tube | 2 |
| 01***36 | Washer,Radio Controlled Slag Handling | 24 |
Komatsu : S6d155-4j(S/N 22144-Up) : Cylinder Head : Rocker Arm Housing Cover
| 01***22 | Bolt,(Cold Terrain Spec.) | 3 |
| 01***40 | Bolt,(For Position Fixing) | 2 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
Komatsu : S6d155-4j(S/N 22144-Up) : Cylinder Head : Turbocharger
| 01***30 | Bolt | 4 |
| 01***18 | Bolt | 6 |
| 04***50 | Screw | 6 |
Komatsu : S6d155-4j(S/N 22144-Up) : Cylinder Head : Water Manifold And Thermostat
| 01***30 | Bolt,(For France Noise Suppression) | 4 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 8 |
| 01***95 | Bolt,(For Reversible Fan) | 2 |
Fuel System
Komatsu : S6d155-4j(S/N 22144-Up) : Fuel System : Automatic Timer
| 61***32 | Automatic Timer A | 1 |
| DK***00 | Washer | 1 |
| DK***00 | Flyweight | 2 |
Komatsu : S6d155-4j(S/N 22144-Up) : Fuel System : Fuel Filter And Mounting(#24805-)
| 07***12 | Gasket,Mechanical Pump Piping | 2 |
| 07***08 | Plug,(Without Auto Priming System) | 1 |
| 60***91 | Cartridge,Fuel Filter | 2 |
Komatsu : S6d155-4j(S/N 22144-Up) : Fuel System : Fuel Filter(#22144-24804)
| 04***12 | Wire,Lock | 2 |
| 07***12 | Gasket,Mechanical Pump Piping | 2 |
| 07***12 | Gasket,(Without Air Compressor Type) (K2) | 1 |
Komatsu : S6d155-4j(S/N 22144-Up) : Fuel System : Fuel Injection Pump (Feed Pump)(#22144-33406)
| DK***20 | Tappet Ass'Y | 1 |
| DK***20 | Pump,Priming | 1 |
| DK***30 | Eye,Joint | 1 |
Komatsu : S6d155-4j(S/N 22144-Up) : Fuel System : Fuel Injection Pump (Feed Pump)(#33407-47497)
| 61***32 | Joint,Fuel | 1 |
| DK***20 | Tappet Ass'Y | 1 |
| DK***20 | Pump,Priming | 1 |
Komatsu : S6d155-4j(S/N 22144-Up) : Fuel System : Fuel Injection Pump (Feed Pump)(#47498-)
| DK***20 | Tappet Ass'Y | 1 |
| DK***20 | Pump,Priming | 1 |
| DK***30 | Eye,Joint | 1 |
Komatsu : S6d155-4j(S/N 22144-Up) : Fuel System : Fuel Injection Pump (Governor)(#22144-47497)
| 61***02 | Injection Pump Ass'Y,(See Fig.451) | 1 |
| 61***20 | Plate? Caution,(French) (Not Shown) | 1 |
| 61***60 | Plate? Caution,(German) (Not Shown) | 1 |
Komatsu : S6d155-4j(S/N 22144-Up) : Fuel System : Fuel Injection Pump (Governor)(#47498-)
| DK***00 | Gear | 1 |
| DK***20 | Lever | 1 |
| DK***01 | Governor Ass'Y | 1 |
Komatsu : S6d155-4j(S/N 22144-Up) : Fuel System : Fuel Injection Pump (Pump)
| 61***02 | Injection Pump Ass'Y,(See Fig.451) | 1 |
| 61***03 | Injection Pump Ass'Y | 1 |
| 61***04 | Injection Pump Ass'Y | 1 |
Komatsu : S6d155-4j(S/N 22144-Up) : Fuel System : Fuel Injection Pump And Piping
| 01***12 | Bolt (M8-1.25x12) | 2 |
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***30 | Bolt,(Cold Terrain Spec.) | 8 |
Komatsu : S6d155-4j(S/N 22144-Up) : Fuel System : Fuel Injection Pump Drive
| 01***30 | Bolt,Radio Controlled Slag Handling | 6 |
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 1 |
| 01***30 | Bolt,(Cold Weather Spec.) | 6 |
Komatsu : S6d155-4j(S/N 22144-Up) : Fuel System : Fuel Nozzle
| 07***12 | Gasket,Mechanical Pump Piping | 2 |
| 61***04 | Nozzle Holder Ass'Y | 1 |
| 61***33 | Nozzle,Fuel | 1 |
Komatsu : S6d155-4j(S/N 22144-Up) : Fuel System : Fuel Nozzle And Spill Pipe
| 01***25 | Washer,Spring?(Sandy And Dusty Spec.) | 3 |
| 01***10 | Washer,See Fig. K4010-12a0 | 3 |
| 07***12 | Gasket,Mechanical Pump Piping | 14 |
Komatsu : S6d155-4j(S/N 22144-Up) : Fuel System : Hand Primer
| 66***00 | Priming Pump Ass'Y | 1 |
Komatsu : S6d155-4j(S/N 22144-Up) : Fuel System : Solenoid And Mounting(#47498-)
| 01***16 | Bolt (Welded) | 4 |
| 01***50 | Bolt,(For Trimming Dozer) | 4 |
| 01***03 | Nut; Was 01508-20603, Nut? L.H. Thread,L.H. Thread | 1 |
Lubricating Oil System
Komatsu : S6d155-4j(S/N 22144-Up) : Lubricating Oil System : By-Pass Oil Filter
| 01***75 | Bolt,(For 75a Alternator) | 2 |
| 01***15 | Bolt | 2 |
| 01***36 | Washer,Radio Controlled Slag Handling | 4 |
Komatsu : S6d155-4j(S/N 22144-Up) : Lubricating Oil System : Camshaft Lubricating Oil Piping
| 07***10 | Connector | 6 |
| 61***40 | Nozzle,Oil | 12 |
| 61***10 | Pipe | 2 |
Komatsu : S6d155-4j(S/N 22144-Up) : Lubricating Oil System : Lubricating Oil Cooler
| 01***20 | Bolt,(Large Capacity Type) (Std) | 2 |
| 01***30 | Bolt,(For France Noise Suppression) | 2 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 19 |
Komatsu : S6d155-4j(S/N 22144-Up) : Lubricating Oil System : Lubricating Oil Filter And Mounting(#22144-24804)
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 6 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 6 |
| 01***85 | Bolt, Control Valve Mounting | 4 |
Komatsu : S6d155-4j(S/N 22144-Up) : Lubricating Oil System : Lubricating Oil Filter And Mounting(#24805-28423)
| 01***40 | Bolt,(Dust And Dirt Protection) | 5 |
| 01***85 | Bolt, Control Valve Mounting | 3 |
| 01***36 | Washer,Radio Controlled Slag Handling | 8 |
Komatsu : S6d155-4j(S/N 22144-Up) : Lubricating Oil System : Lubricating Oil Filter And Mounting(#28424-)
| 01***40 | Bolt,(Dust And Dirt Protection) | 5 |
| 01***85 | Bolt, Control Valve Mounting | 3 |
| 01***36 | Washer,Radio Controlled Slag Handling | 8 |
Komatsu : S6d155-4j(S/N 22144-Up) : Lubricating Oil System : Lubricating Oil Filter Bracket
| 01***70 | Bolt, Spacer | 2 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 6 |
| 01***80 | Bolt,(Shim 5 Pieces Over) | 5 |
Komatsu : S6d155-4j(S/N 22144-Up) : Lubricating Oil System : Lubricating Oil Pump(#22144-26422)
| 01***20 | Bolt,(Large Capacity Type) (Std) | 2 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***50 | Bolt - Torque Converter Totransmission Mounting | 2 |
Komatsu : S6d155-4j(S/N 22144-Up) : Lubricating Oil System : Lubricating Oil Pump(#26423-)
| 01***20 | Bolt,(Large Capacity Type) (Std) | 2 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***50 | Bolt - Torque Converter Totransmission Mounting | 2 |
Komatsu : S6d155-4j(S/N 22144-Up) : Lubricating Oil System : Oil Strainer And Piping
| 01***12 | Bolt,(Without R.P.C.U.) | 2 |
| 01***14 | Bolt | 2 |
| 01***22 | Bolt | 3 |
Komatsu : S6d155-4j(S/N 22144-Up) : Lubricating Oil System : Power Take Off Lubricating Oil Piping
| 01***22 | Bolt | 1 |
| 01***30 | Bolt,(For France Noise Suppression) | 2 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 4 |
Komatsu : S6d155-4j(S/N 22144-Up) : Lubricating Oil System : Turbocharger Lubricating Oil Piping
| 01***10 | Bolt | 3 |
| 01***35 | Bolt,(Without Auto Priming System) | 2 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 2 |
Tool And Kit
Komatsu : S6d155-4j(S/N 22144-Up) : Tool And Kit : Gasket Kit
| 01***12 | Washer,Lock | 3 |
| 01***12 | Washer (K2) | 4 |
| 01***08 | Washer (K2) | 1 |
S6D155-4J(S/N 22144-UP) serial number reference
The engine serial number plate is located on the left side of the engine block or near the valve cover. The machine PIN plate is typically on the right-hand side of the cab or front frame; the 3-character prefix is the first three letters of the machine model code (e.g., D15, D27).
| Prefix | Identifies | Notes |
|---|---|---|
| D155W-1 | Bulldozer | S6D155-4J engine fitted to D155W-1 dozers S/N 12128-UP. Source ties engine S/N 22144-UP to this machine range. |
| D275A-2 | Crawler Dozer | S6D155-4J engine listed for D275A-2 dozers S/N 10001-Up. Source lists engine S/N 22144-UP in the same equipment guide context. |
Frequently asked questions
What engine does the Komatsu S6D155-4J use?
The Komatsu S6D155-4J is a turbocharged, six-cylinder, direct-injection diesel engine. It is part of the 155-series family and was used in D155A and D155W dozers. It produces approximately 320 hp (239 kW) gross power.
What is the operating weight of the machine powered by this engine?
The operating weight varies by configuration and attachment. For the Komatsu D155A-1 dozer, the operating weight is approximately 59,350 lbs (26,943 kg). Other configurations in the D155 series can range up to 87,083 lbs (39,474 kg).
What engine replaced the S6D155-4J?
The S6D155-4J was succeeded by the S6D170E-2A and S6D170-1L engines in later Komatsu dozer models. These newer engines offer increased displacement and improved emissions compliance for modern Tier 4 and Stage III standards.
What S6D155-4J(S/N 22144-UP) owners discuss
What is the net horsepower rating for the S6D155-4 engine as used in the D155A-1 crawler dozer?
What are the common hydraulic behaviors associated with Komatsu excavators using the S6D155-4 series engine?
What undercarriage and wear patterns are typical for machines powered by this engine series?
What electrical or sensor issues are frequently reported by owners of Komatsu equipment with this engine?
What are the known engine quirks or maintenance priorities for the S6D155-4 series?
What fluids and specifications are recommended for the S6D155-4 engine and associated systems?
What should be checked when buying a used machine with an S6D155-4J engine (S/N 22144-Up)?
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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