Komatsu S4D105-3D(S/N 44583-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu S4D105-3D is a 4-cylinder, turbocharged diesel engine with a 4,330 cc displacement, producing 65 HP at 2,300 rpm. It is primarily fitted to the D45S-1 crawler dozer and GD22AC-1A motor grader. The engine features a Bosch PES-A fuel injection pump and a T04B turbocharger. Production years for this specific engine configuration span the late 1980s through the early 2000s, serving as a workhorse in the mid-size earthmoving class. It succeeded earlier naturally aspirated 105-series variants and was eventually replaced by the S4D105-5 series in newer machine generations.
Across the 105-series generations, primary changes involved adding turbocharging and intercooling to meet power density demands, followed by updates to fuel injection systems and emissions compliance. The S4D105-3D remains significant in the used and parts market because it powers a high volume of durable, older dozers and graders that are still in active service. Its simple mechanical fuel system and robust block design make it a favorite for rebuild and long-term fleet maintenance where reliability outweighs the need for modern electronic controls.
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 S4D105-3D(S/N 44583-UP) specifications
Engine
| Model | S4D105-3D |
| Gross/Net Power | 65 HP (48.5 kW) @ 2,300 rpm |
| Displacement | 4,330 cc (4.33 L; 264.2 cu in) |
| Cylinders | 4 |
| 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 | 986 mm (38.6 in) |
| Transport Width | 776 mm (30.6 in) |
| Transport Height | 1,375 mm (54.1 in) |
| Wheelbase or 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 Speeds | Not documented for this exact serial range — verify with your dealer |
| Class-Relevant Performance | 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)
| Fuel Tank | Not documented for this exact serial range — verify with your dealer |
| Hydraulic System | Not documented for this exact serial range — verify with your dealer |
| Engine Oil | 18 L (4.75 US gal) |
| Cooling System | 40 L (10.56 US gal) |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
S4D105-3D(S/N 44583-UP) fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine Crankcase (with filter) | 13 L (3.4 US gal) | Komatsu EO-10 or EO-15 Diesel Engine Oil; viscosity varies by climate per factory spec sheet |
| Cooling System | 22 L (5.8 US gal) | Komatsu Super Coolant AF-NAC or equivalent ethylene glycol coolant; varies by machine series per factory spec sheet |
| Fuel Tank | Not documented for this exact serial range — verify with your dealer | ASTM D975 No.1 and No.2 Diesel Fuel |
| Transmission/Powertrain | Not documented for this exact serial range — verify with your dealer | Not documented for this exact serial range — verify with your dealer |
| Final Drives | Not documented for this exact serial range — verify with your dealer | Not documented for this exact serial range — verify with your dealer |
| Hydraulic System and Tank | Not documented for this exact serial range — verify with your dealer | Not documented for this exact serial range — verify with your dealer |
| Axles/Differentials | Not documented for this exact serial range — verify with your dealer | Not documented for this exact serial range — verify with your dealer |
| Grease | N/A | Komatsu Lithium Complex Grease or equivalent |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Komatsu S4D105-3D(S/N 44583-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 S4D105-3D(S/N 44583-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 engine oil. Check coolant SCA levels at 500 hours to prevent liner cavitation in the S4D105-3D block. Monitor hydraulic oil particle count and viscosity during the 1,000-hour service to detect pump wear early. Track fuel dilution and soot levels in the oil to adjust drain intervals if operating in high-dust conditions. Use KOMTRAX telematics data to correlate load frequency with fluid degradation rates for this specific engine model.
Corrective & Common Repairs
Address frequent S4D105-3D issues by inspecting the T04B turbocharger shaft play during the 1,000-hour service. Replace the fuel injection pump governor springs if high idle speed drifts outside the 2,450-2,550 rpm range. Check the fuel filter housing for leaks which can cause hard starting. Inspect the cylinder head gasket for coolant loss signs, as the 27-liter coolant capacity requires precise pressure management. Verify the condition of the oil cooler cores for debris blockage that leads to overheating under load.
Overhaul & Rebuild Points
Plan an inframe overhaul for the S4D105-3D when compression drops below specification or oil consumption exceeds 1 liter per 10 hours. Key rebuild components include piston rings, cylinder liners, and main bearings. The 4,330 cc displacement allows for standard bore-out procedures. Replace the turbocharger T04B if exhaust smoke indicates excessive oil carry-over. Ensure the Bosch PES-A injection pump is calibrated during reassembly to maintain the 65 HP output at 2,300 rpm.
Seasonal & Environment Servicing
In cold climates, verify the operation of the engine block heater to ensure proper starting temperatures for the S4D105-3D. Use low-viscosity Komatsu EO engine oil during winter months to reduce cranking load. In high-dust environments, service the air cleaner pre-cleaner daily and check the dust indicator frequently. During hot weather, clean the radiator and oil cooler fins every 10 hours to maintain the 27-liter coolant system's efficiency. Inspect the thermostat housing for leaks that can cause overheating in heavy-duty dozing applications.
S4D105-3D(S/N 44583-UP) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 6130-72-6100 | Fuel Filter Ass'Y | Fuel system service | Check fitment → |
| 07281-00197 | Clamp,(With Pre-Fuel Filter) | Fuel system service | Check fitment → |
| 600-211-6230 | Cartridge,(For Oil Filter) | Lubrication service | Check fitment → |
| 6130-62-2101 | Oil Filter Ass'Y | Lubrication service | Check fitment → |
| 07000-02075 | O-Ring,Steering Oil Filter | Lubrication service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
S4D105-3D(S/N 44583-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 absent 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 pump lines for blockage or leakage |
| CA441 | Battery voltage too low | Weak battery, failing alternator, or loose connections | Check the battery health and alternator output; replace the alternator or battery as needed |
| CA122 | Intake air pressure sensor feedback voltage too high | Faulty intake pressure sensor or wiring issue | Verify the intake pressure sensor operation and inspect the wiring harness |
| CA123 | Intake air pressure sensor feedback voltage too low | Sensor short circuit or airflow restriction in the intake system | Check for a sensor short and inspect for airflow restrictions |
| CA153 | Intake air temperature sensor feedback voltage too high | Faulty Intake Air Temperature (IAT) sensor | Replace or test the IAT sensor |
| CA234 | Engine overspeed | Throttle calibration error, excessive engine load cycle, or operator misuse | Verify throttle calibration and review engine load cycles |
| AA10NX | Air cleaner clogging | Dirty or blocked air filter element | Replace the air filter element |
| B@BCNS | Engine coolant overheating | Low coolant level, failed fan belt, or blocked radiator fins | Check radiator fins, fan belt, and coolant level; fill coolant and inspect for leaks |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
S4D105-3D(S/N 44583-UP) attachments & work tools
Bulldozer Attachments
The S4D105-3D engine (S/N 44583-UP) powers the D45S-1 dozer. Factory configurations for this class typically include a straight blade or angle blade with a single or double tilt mechanism. Guarding options often involve side cutters and rear guard plates to protect the undercarriage and radiator during heavy pushing operations.
Motor Grader Attachments
This engine series is applied to the GD22AC-1A motor grader. Standard work tools include a moldboard blade with adjustable pitch and tilt, along with a front or rear ripper attachment for soil breaking. Hydraulic coupler systems are integrated into the frame to control blade lift, tilt, and ripper depth, requiring specific hydraulic kit arrangements for flow and pressure regulation.
Mini Excavator Attachments
The S4D105-3D variant supports the EC50V-1 and EC50VS-1 mini excavators. Typical work tools include standard digging buckets, grading buckets, and hydraulic breakers. These machines utilize a quick coupler system for rapid tool changes, with hydraulic lines routed through the boom to support auxiliary circuits for breaker or grapple operation.
Compact Excavator Attachments
Applications include the EC75Z-1 and EC75ZS-1 compact excavators. Common attachments feature narrow or standard width buckets, thumb attachments for material handling, and hydraulic hammers. Mounting systems rely on the standard excavator stick geometry, with hydraulic kits configured to manage the increased flow demands of high-pressure breaker tools.
Wheeled Excavator Attachments
The engine is used in the EG45-1 and EG45S-1 wheeled excavators. Work tools generally include digging buckets, rock buckets, and mulching heads. The wheeled chassis configuration requires specific hydraulic routing to support the travel motors and attachment circuits, often utilizing a dedicated auxiliary valve block for tool-specific hydraulic functions.
Compact Wheel Loader Attachments
This engine series powers the CD40-1, CD40C-1, and W40-1 compact wheel loaders. Standard work tools include general purpose buckets, pallet forks, and snow buckets. Mounting is typically via a skid-steer style quick attach system or a dedicated loader frame pin-on connection, with hydraulic lines routed to the lift arms and tilt cylinders.
Mini Loader Attachments
The BC100-1 mini loader utilizes this engine class. Typical attachments include buckets, brooms, and trenching tools. The machine employs a quick-attach coupler system for tool interchangeability, with hydraulic circuits designed to support both the loader lift/tilt functions and auxiliary tool operations through a diverter valve.
All S4D105-3D(S/N 44583-UP) assemblies by section
Every catalogued assembly group for the Komatsu S4D105-3D(S/N 44583-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Cooling And Electrical Systems
Komatsu : S4d105-3d(S/N 44583-Up) : Cooling And Electrical Systems : Alternator (25a)
| 60***50 | Alternator A. (25a) | 1 |
| KD***30 | Holder,Brush | 1 |
| KD***72 | Slip Ring Ass'Y | 1 |
Komatsu : S4d105-3d(S/N 44583-Up) : Cooling And Electrical Systems : Alternator And Mounting
| 01***40 | Bolt,(Dust And Dirt Protection) | 1 |
| 01***30 | Bolt,Radio Controlled Slag Handling | 1 |
| 01***25 | Bolt | 1 |
Komatsu : S4d105-3d(S/N 44583-Up) : Cooling And Electrical Systems : Resistor And Heater Signal(#44583-60264)
| 61***50 | Resistor | 1 |
| 61***21 | Signal,Heater | 1 |
Komatsu : S4d105-3d(S/N 44583-Up) : Cooling And Electrical Systems : Starting Motor
| 60***40 | Starting Motor Ass'Y,(Dust And Drip Proof Type) | 1 |
| 60***41 | Starting Motor Ass'Y,(See Fig.1545) | 1 |
| 60***42 | Starting Motor A.,(5.5kw) (See Fig.2546) | 1 |
Komatsu : S4d105-3d(S/N 44583-Up) : Cooling And Electrical Systems : Starting Motor And Mounting
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 3 |
| 01***36 | Washer,Radio Controlled Slag Handling | 3 |
| 07***00 | O-Ring,(F4350-65a1 -5 ) | 1 |
Komatsu : S4d105-3d(S/N 44583-Up) : Cooling And Electrical Systems : Water Pump And Cooling Fan
| 01***16 | Bolt,(For Slag Handling) | 4 |
| 01***30 | Bolt,(Cold Terrain Spec.) | 2 |
| 01***50 | Bolt,(For Trimming Dozer) | 1 |
Cylinder Block
Komatsu : S4d105-3d(S/N 44583-Up) : Cylinder Block : Camshaft And Tappet
| 01***18 | Bolt | 2 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***65 | Bolt,(For Suction Fan)(4d130-1d) | 1 |
Komatsu : S4d105-3d(S/N 44583-Up) : Cylinder Block : Crankshaft
| 01***30 | Bolt,(For France Noise Suppression) | 4 |
| 02***04 | Plug,(Not Shown) | 4 |
| 04***25 | Key | 1 |
Komatsu : S4d105-3d(S/N 44583-Up) : Cylinder Block : Cylinder Block
| 01***30 | Bolt,Radio Controlled Slag Handling | 7 |
| 01***65 | Bolt | 3 |
| 01***36 | Washer,Radio Controlled Slag Handling | 7 |
Komatsu : S4d105-3d(S/N 44583-Up) : Cylinder Block : Flywheel And Flywheel Housing
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 15 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 5 |
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 8 |
Komatsu : S4d105-3d(S/N 44583-Up) : Cylinder Block : Front Cover
| 01***45 | Bolt,(For Suction? Reversible Fan) | 7 |
| 01***75 | Bolt,(For D57sr) | 2 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 9 |
Komatsu : S4d105-3d(S/N 44583-Up) : Cylinder Block : Oil Pan
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 23 |
| 01***30 | Bolt,(For France Noise Suppression) | 3 |
Komatsu : S4d105-3d(S/N 44583-Up) : Cylinder Block : Piston And Connecting Rod
| 61***14 | Bolt | 2 |
| 61***15 | Bolt,(Service Parts) | 2 |
| 61***22 | Nut,(Service Parts) | 2 |
Cylinder Head
Komatsu : S4d105-3d(S/N 44583-Up) : Cylinder Head : Air Intake Connection And Air Cleaner
| 01***16 | Bolt,(For Slag Handling) | 3 |
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***30 | Bolt,(Cold Terrain Spec.) | 1 |
Komatsu : S4d105-3d(S/N 44583-Up) : Cylinder Head : Air Intake Connection And Air Cleaner (Tunnel Spec.)(#60265-)
| 01***16 | Bolt,(For Slag Handling) | 3 |
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***30 | Bolt,(Cold Terrain Spec.) | 1 |
Komatsu : S4d105-3d(S/N 44583-Up) : Cylinder Head : Cylinder Head
| 01***16 | Bolt,(For Slag Handling) | 6 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***25 | Washer,Spring?(Sandy And Dusty Spec.) | 6 |
Komatsu : S4d105-3d(S/N 44583-Up) : Cylinder Head : Cylinder Head Cover
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***50 | Bolt,(For Trimming Dozer) | 8 |
| 01***70 | Bolt | 4 |
Komatsu : S4d105-3d(S/N 44583-Up) : Cylinder Head : Exhaust Manifold And Muffler
| 01***11 | Nut (M14-1.50 Thd), Nut; Was 01582-01411 | 2 |
| 01***16 | Washer,Radio Controlled Slag Handling | 3 |
| 01***23 | Plain Washer | 2 |
Komatsu : S4d105-3d(S/N 44583-Up) : Cylinder Head : Exhaust Manifold And Muffler (Tunnel Spec.)(#60265-)
| 01***16 | Washer,Radio Controlled Slag Handling | 3 |
| 01***10 | Washer | 2 |
| 02***38 | Bolt | 4 |
Komatsu : S4d105-3d(S/N 44583-Up) : Cylinder Head : Intake Air Heater(#60265-)
| 01***16 | Bolt (Welded) | 2 |
| 01***30 | Bolt,(For France Noise Suppression) | 2 |
| 01***19 | Washer,(Not Used With Ventilator) | 2 |
Komatsu : S4d105-3d(S/N 44583-Up) : Cylinder Head : Rocker Arm
| 01***12 | Bolt,(Without R.P.C.U.) | 1 |
| 01***80 | Bolt,(Shim 5 Pieces Over) | 4 |
| 01***19 | Washer,(Not Used With Ventilator) | 1 |
Komatsu : S4d105-3d(S/N 44583-Up) : Cylinder Head : Tubrocharger (Except Japan)
| 61***00 | Turbocharger Ass'Y,(See Fig.1141) | 1 |
| 61***01 | Turbocharger Ass'Y,(See Fig.1141) | 1 |
| 61***02 | Turbocharger Ass'Y,(See Fig.1141) | 1 |
Fuel System
Komatsu : S4d105-3d(S/N 44583-Up) : Fuel System : Fuel Filter And Mounting
| 01***20 | Bolt,(Large Capacity Type) (Std) | 4 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 2 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 6 |
Komatsu : S4d105-3d(S/N 44583-Up) : Fuel System : Fuel Injection Pump (Feed Pump)
| DK***20 | Housing | 1 |
| DK***10 | Feed Pump Ass'Y | 1 |
| DK***00 | Spring,Piston | 1 |
Komatsu : S4d105-3d(S/N 44583-Up) : Fuel System : Fuel Injection Pump (Governor)
| DK***00 | Adapter | 1 |
| DK***40 | Gasket,Air Compressor | 2 |
| DK***00 | Collar | 1 |
Komatsu : S4d105-3d(S/N 44583-Up) : Fuel System : Fuel Injection Pump (Governor) (Tunnel Spec.)
| DK***80 | Shim? 0.5mm | 0 |
| DK***00 | Adapter | 1 |
| DK***20 | Lever | 1 |
Komatsu : S4d105-3d(S/N 44583-Up) : Fuel System : Fuel Injection Pump (Pump)
| 61***80 | Injection Pump Ass'Y,(Tunnel Spec.) | 1 |
| 61***10 | Injection Pump Ass'Y | 1 |
| DK***30 | Bearing | 2 |
Komatsu : S4d105-3d(S/N 44583-Up) : Fuel System : Fuel Injection Pump And Piping
| 01***25 | Bolt (M6-1.00x25) | 1 |
| 01***35 | Stud | 6 |
| 01***35 | Stud | 4 |
Komatsu : S4d105-3d(S/N 44583-Up) : Fuel System : Fuel Injection Pump And Piping (Tunnel Spec.)(#60265-)
| 01***25 | Bolt (M6-1.00x25) | 1 |
| 01***16 | Bolt,(For Slag Handling) | 2 |
| 01***35 | Stud | 4 |
Komatsu : S4d105-3d(S/N 44583-Up) : Fuel System : Fuel Nozzle And Spill Pipie
| 01***65 | Bolt | 8 |
| 07***12 | Gasket,Mechanical Pump Piping | 6 |
| 07***37 | Clamp, Overflow Hose | 2 |
Komatsu : S4d105-3d(S/N 44583-Up) : Fuel System : Intake Air Heater(#44583-60264)
| 01***16 | Bolt,(For Slag Handling) | 1 |
| 01***05 | Nut (Welded) | 2 |
| 01***19 | Washer,(Not Used With Ventilator) | 2 |
Lubricating Oil System
Komatsu : S4d105-3d(S/N 44583-Up) : Lubricating Oil System : Lubricating Oil Filter And Oil Cooler
| 01***16 | Bolt,(For Slag Handling) | 8 |
| 01***25 | Bolt,(Without Auto Priming System) | 1 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 1 |
Komatsu : S4d105-3d(S/N 44583-Up) : Lubricating Oil System : Lubricating Oil Pump
| 01***30 | Bolt,(For France Noise Suppression) | 8 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 8 |
| 01***16 | Washer,Radio Controlled Slag Handling | 8 |
Komatsu : S4d105-3d(S/N 44583-Up) : Lubricating Oil System : Lubricating Oil Strainer
| 01***25 | Bolt,(Without Auto Priming System) | 2 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 5 |
| 01***08 | Nut, Regular Hexagon (M10-1.50) | 1 |
Komatsu : S4d105-3d(S/N 44583-Up) : Lubricating Oil System : Turbocharger Lubricating Oil Piping
| 01***22 | Bolt,(Cold Terrain Spec.) | 4 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***25 | Washer,Spring?(Sandy And Dusty Spec.) | 4 |
Tool And Kit
Komatsu : S4d105-3d(S/N 44583-Up) : Tool And Kit : Gasket Kit
| 01***23 | Washer,Lock (K2) | 1 |
| 07***65 | O-Ring,Injection Pump Case | 1 |
| 07***70 | O-Ring,(For Intake Air Cover) | 1 |
S4D105-3D(S/N 44583-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. Read the first three characters of the 17-character ISO PIN stamped on the emissions/export plate to identify the prefix.
| Prefix | Identifies | Notes |
|---|---|---|
| X0A0T | Komatsu DOZER | Confirmed for S4D105-3B engine (S/N 44579-Up) in equipment guide. The S4D105-3D (S/N 44583-UP) is the immediate successor range. Verify with dealer for exact prefix continuity between 3B and 3D variants. |
Frequently asked questions
What is the engine model for the Komatsu S4D105-3D?
The engine model is the Komatsu S4D105-3D, a 4-cylinder, turbocharged diesel engine with a 4,330 cc displacement.
What is the operating weight of the machine powered by this engine?
Operating weight varies by configuration and series. For the D45S-1 dozer, the weight is approximately 12,000-14,000 kg (26,455-30,865 lb) depending on the blade and counterweight setup.
What engine replaced the S4D105-3D?
The S4D105-3D was succeeded by the S4D105-5 series engines in later Komatsu machine generations, which offered improved emissions compliance and fuel efficiency.
Need a specific S4D105-3D(S/N 44583-UP) part?
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