Komatsubulldozersmall ( - d39)

Komatsu DWC020_1C_S(S/N 60001-UP (D20S-6))

Maintenance schedule, common problems & OEM parts breakdown

Search live DWC020_1C_S(S/N 60001-UP (D20S-6)) parts

The Komatsu DWC020-1C-S (S/N 60001-UP, D20S-6) is a mid-size crawler bulldozer designed for earthmoving and site development. Operating weights for the Komatsu bulldozer line range from 8 to 108 tonnes, with this specific model falling within the mid-size category. The machine is part of the DWC020 series, which includes variants such as the DWC020-1C-A and DWC020-1C-P. It is equipped with a D20S-6 engine series. Configurations offered include standard and low-ground-pressure (PX) options, along with available Intelligent Machine Control systems for grading efficiency.

Across the Komatsu bulldozer lineage, the DWC020 series represents a generation focused on cost-efficiency and durability through a unique undercarriage design and high-quality components. The machine matters in the used and parts market because it bridges the gap between compact utility dozers and heavy mining units, offering a balance of power and maneuverability. As older models reach end-of-life, the availability of genuine parts and the robustness of the D20S-6 engine make it a reliable choice for fleet replacement or expansion.

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 DWC020_1C_S(S/N 60001-UP (D20S-6)) specifications

Engine

ModelD20S-6
Emissions TierTier 4 Final / EU Stage V

Weights

Operating Weight (Standard)Not documented for this exact serial range — verify with your dealer
Operating Weight (LGP)Not documented for this exact serial range — verify with your dealer

Dimensions

Transport LengthNot documented for this exact serial range — verify with your dealer
Transport WidthNot documented for this exact serial range — verify with your dealer
Transport HeightNot documented for this exact serial range — verify with your dealer
Track GaugeNot documented for this exact serial range — verify with your dealer
Ground ClearanceNot documented for this exact serial range — verify with your dealer

Performance

Travel Speed (Forward)Not documented for this exact serial range — verify with your dealer
Travel Speed (Reverse)Not documented for this exact serial range — verify with your dealer
Drawbar PullNot documented for this exact serial range — verify with your dealer
GradeabilityNot documented for this exact serial range — verify with your dealer
Ground PressureNot documented for this exact serial range — verify with your dealer

Blades

Standard Blade CapacityNot documented for this exact serial range — verify with your dealer
SU Blade CapacityNot documented for this exact serial range — verify with your dealer
A Blade CapacityNot documented for this exact serial range — verify with your dealer
VPAT Blade CapacityNot documented for this exact serial range — verify with your dealer

Service Capacities

Fuel TankNot documented for this exact serial range — verify with your dealer
Hydraulic SystemNot documented for this exact serial range — verify with your dealer
Engine OilNot documented for this exact serial range — verify with your dealer
Cooling SystemNot 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 DWC020_1C_S(S/N 60001-UP (D20S-6)) maintenance schedule

Service intervalTasks
Every 10 h
  • Check engine oil level and condition.
  • Check hydraulic fluid level via sight glass.
  • Check coolant level and ensure cap is secure.
  • Drain water from fuel separator.
  • Check DEF level.
  • Check air filter restriction indicator.
  • Inspect track tension and shoe/pad condition.
  • Inspect hydraulic hoses for cracks or leaks.
  • Check pins, bushings, and attachment points.
  • Clear debris from radiator and oil cooler fins.
  • Check for fluid leaks under the machine.
  • Verify ROPS/FOPS integrity and seat belt.
  • Test horn, backup alarm, and lights.
  • Ensure emergency shutoff is accessible.
  • Start engine and verify gauges and KOMTRAX display are normal.
  • Test all controls for smooth response.
  • Check service and parking brakes.
Every 250 h
  • Change engine oil and filter.
  • Grease all points including blade, ripper, push arms, and pivots.
  • Check fluid levels.
  • Check air filter outer element.
  • Inspect belts and hoses.
  • Perform visual walk-around inspection.
Every 500 h
  • Replace fuel filter.
  • Replace hydraulic return filter.
  • Service battery and load test.
  • Test coolant SCA concentration.
  • Collect KOWA oil sample.
  • Perform detailed undercarriage inspection.
Every 1,000 h
  • Collect hydraulic oil sample.
  • Change final drive oil on both sides.
  • Inspect turbocharger.
  • Take wear measurements on critical components.
  • Check valve adjustment.
  • Perform structural inspection.
Every 2,000 h
  • Change hydraulic oil.
  • Flush and replace coolant.
  • Service transmission and torque converter.
  • Perform comprehensive component evaluation.
  • Check KDPF status.
  • Torque ROPS bolts.
  • Check cutting edge and end bit bolt torque.

Servicing the DWC020_1C_S(S/N 60001-UP (D20S-6)) beyond the schedule

Predictive Maintenance & Fluid Analysis

Utilize KOWA fluid analysis at every 500-hour interval to monitor engine oil wear metals, hydraulic fluid particle count, and coolant pH levels. Track KOMTRAX telematics data for fuel consumption and load frequency to adjust service schedules proactively. Inspect the air filter restriction indicator daily and replace the outer element at 1,000 hours or when indicated. Monitor DEF levels and SCR system status to ensure emissions compliance and prevent engine derating. Early detection of coolant contamination or hydraulic oxidation extends component life and prevents catastrophic failure.

Corrective & Common Repairs

Address undercarriage wear by measuring track chain, sprockets, and rollers during the 500-hour detailed inspection. Replace hydraulic return filters at 500 hours to protect pumps and valves from contamination. Inspect final drive oil for metal particles at 1,000 hours to identify gear wear early. Check and torque ROPS bolts and cutting edge bolts at 2,000 hours to maintain structural integrity. Replace worn belts and hoses during the 2,000-hour service to prevent sudden breakdowns. Ensure all grease points, including blade and ripper pivots, are lubricated to reduce friction and wear.

Overhaul & Rebuild Points

Plan major overhauls based on cumulative hour metrics and fluid analysis trends. Replace hydraulic oil at 2,000 hours and flush the cooling system to remove sediment and inhibitors. Inspect the turbocharger and valve adjustments at 1,000 hours to maintain engine performance. Evaluate the transmission and torque converter condition during the 2,000-hour comprehensive evaluation. Monitor the KDPF status for regeneration needs and plan for exchange at 4,500 hours. Structural inspections at 1,000 and 2,000 hours identify fatigue cracks in the frame and boom before they become critical.

Seasonal & Environment Servicing

In cold climates, check coolant concentration and glycol content to prevent freezing. Drain water from the fuel separator daily to avoid fuel line icing. In dusty environments, clean the air filter outer element more frequently and inspect the radiator fins for debris buildup. Monitor hydraulic oil viscosity changes in extreme temperatures and adjust fluid selection if necessary. Inspect track tension regularly as temperature fluctuations affect chain length and ground pressure. Ensure the cooling system is clean and free of insects or chaff to maintain optimal operating temperatures.

DWC020_1C_S(S/N 60001-UP (D20S-6)) fault codes & troubleshooting

CodeMeaningLikely causeWhat to do
CA115Engine crankshaft speed sensor and backup speed sensor failureFaulty speed sensor, broken wiring harness, or corroded connector at the sensor pinInspect the sensor wiring and connector for damage or corrosion; replace the speed sensor if voltage is abnormal at the pin
CA111Internal engine controller (ECM) faultElectronic Control Module hardware failure or internal circuit malfunctionReplace or reprogram the ECM; verify power and ground connections first
CA451Common rail pressure sensor feedback value too highMalfunctioning rail pressure sensor, actual overpressure condition, or wiring issueDiagnose the fuel rail pressure sensor circuit and check for actual overpressure in the fuel lines
CA441Battery voltage too lowWeak battery, failing alternator, or loose/corroded connectionsCheck the alternator output and battery health; replace the battery or alternator as needed
AA10NXAir cleaner cloggingClogged air filter element due to dust or lack of maintenanceReplace the air filter element immediately
B@BCNSEngine coolant overheatingLow coolant level, blocked radiator fins, or failed fan beltCheck radiator fins for debris, verify fan belt condition, and top up coolant level
DGH2KBHydraulic oil temperature sensor short circuitShorted hydraulic oil temperature sensor or damaged wiringReplace the hydraulic oil temperature sensor and inspect the harness for chafing
CA122Intake air pressure sensor feedback voltage too highFaulty intake pressure sensor or restricted airflow causing high pressureVerify the intake pressure sensor operation and check for airflow restrictions
CA234Engine overspeedThrottle calibration error, engine load cycle issue, or operator misuseVerify throttle calibration and inspect the engine load cycle for mechanical binding
CA153Intake air temperature sensor feedback voltage too highFaulty intake air temperature (IAT) sensor or wiring shortTest the IAT sensor and replace it if the voltage reading is out of specification

Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.

DWC020_1C_S(S/N 60001-UP (D20S-6)) attachments & work tools

Blades

The source text lists blade components for the D20A-5 and D20A-6 models, which share the D20 series designation with the D20S-6, but does not provide specific width or capacity figures for the DWC020_1C_S(S/N 60001-UP (D20S-6)) configuration. Availability for S/SU/A and VPAT blade types is not documented for this exact serial range in the provided sources.

Rippers

The source text references ripper tips and teeth for the D61/D65 and D85 series but does not list specific multi-shank or single-shank ripper options, weights, or availability for the DWC020_1C_S(S/N 60001-UP (D20S-6)) bulldozer.

Winches

The source text identifies a towing winch assembly (clutch shaft and brake drum) for the DWC020_1C_A model, but does not confirm compatibility with the DWC020_1C_S(S/N 60001-UP (D20S-6)) or provide towing capacity specifications.

Drawbars/Counterweights

The source text lists drawbars and tow hitches for the D65PX/EX-12/15 models but does not provide data on drawbars or counterweights compatible with the DWC020_1C_S(S/N 60001-UP (D20S-6)) bulldozer.

Cab/ROPS Guarding

The source text does not contain specific information regarding cab or ROPS guarding options for forestry or waste configurations for the DWC020_1C_S(S/N 60001-UP (D20S-6)) bulldozer.

Hydraulic Arrangement

The source text does not provide details on the hydraulic arrangement for front or rear tools for the DWC020_1C_S(S/N 60001-UP (D20S-6)) bulldozer.

All DWC020_1C_S(S/N 60001-UP (D20S-6)) assemblies by section

Every catalogued assembly group for the Komatsu DWC020_1C_S(S/N 60001-UP (D20S-6)). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Guard
Komatsu : Dwc020_1c_s(S/N 60001-Up (D20s-6)) : Guard : Rear Cover And Hydraulic Tank (For Towing Winch)(#60001-60257)
01***20Bolt,(With Auto Emergency Steering)3
01***20Bolt,(For Quick Shift) (Mitsubishi)8
01***25Bolt,(For Canvas Canopy?Head Guard)6
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Komatsu : Dwc020_1c_s(S/N 60001-Up (D20s-6)) : Guard : Rear Cover And Hydraulic Tank (For Towing Winch)(#60258-)
01***20Bolt,(With Auto Emergency Steering)3
01***20Bolt,(For Quick Shift) (Mitsubishi)8
01***40Bolt,(With Service Valve R.H.)4
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Work Equipment
Komatsu : Dwc020_1c_s(S/N 60001-Up (D20s-6)) : Work Equipment : Hitch (For Towing Winch)
01***60Bolt,(Shim Thickness?More Than 8mm)4
01***42Washer,Spring (For Pedal Steering), Washer-Spring4
04***40Pin,Cotter1
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Komatsu : Dwc020_1c_s(S/N 60001-Up (D20s-6)) : Work Equipment : Towing Winch (Brake Band And Linkage)
01***45Bolt, Mounting Bracket To Radiator (Top)1
01***08Nut,(For Canvas Canopy?Head Guard)1
01***36Wahser-Spring, Washer,Spring (Without Towing Winch)1
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Komatsu : Dwc020_1c_s(S/N 60001-Up (D20s-6)) : Work Equipment : Towing Winch (Clutch Shaft And Brake Drum)
01***20Bolt,(With Auto Emergency Steering)4
01***25Bolt,(For Canvas Canopy?Head Guard)4
01***35Bolt,(For Quick Shift) (Mitsubishi)12
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Komatsu : Dwc020_1c_s(S/N 60001-Up (D20s-6)) : Work Equipment : Towing Winch (Fair Lead)
01***20Bolt,(For Quick Shift) (Mitsubishi)8
01***35Bolt, Hydraulic Tank Mounting6
01***30Washer, Spring (Supplied W/Spider Assembly), Washer-Spring8
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Komatsu : Dwc020_1c_s(S/N 60001-Up (D20s-6)) : Work Equipment : Towing Winch (Gear Case)
01***25Bolt,(For Canvas Canopy?Head Guard)12
01***30Bolt,(Not Used With Emergency Str.)25
01***40Bolt (Op)4
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Komatsu : Dwc020_1c_s(S/N 60001-Up (D20s-6)) : Work Equipment : Towing Winch (Logging Arm)
01***20Bolt,(For Quick Shift) (Mitsubishi)6
01***30Bolt,(Not Used With Emergency Str.)2
01***35Bolt, Hydraulic Tank Mounting8
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Komatsu : Dwc020_1c_s(S/N 60001-Up (D20s-6)) : Work Equipment : Towing Winch (P.T.O. Shaft And Pinion Gear)
01***25Bolt,(For Canvas Canopy?Head Guard)15
01***08Nut,(For Canvas Canopy?Head Guard)1
01***30Washer, Spring (Supplied W/Spider Assembly), Washer-Spring15
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Komatsu : Dwc020_1c_s(S/N 60001-Up (D20s-6)) : Work Equipment : Towing Winch (Shift Fork And Cover)
01***30Bolt,(For Mechanical Governor)2
01***20Bolt,(For Quick Shift) (Mitsubishi)4
01***25Bolt,(For Canvas Canopy?Head Guard)11
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Komatsu : Dwc020_1c_s(S/N 60001-Up (D20s-6)) : Work Equipment : Towing Winch (Wire Drum And Gear)
01***30Bolt,(For Quick Shift) (Mitsubishi)4
01***30Bolt,(Not Used With Emergency Str.)23
01***36Wahser-Spring, Washer,Spring (Without Towing Winch)15
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Work Equipment Control System
Komatsu : Dwc020_1c_s(S/N 60001-Up (D20s-6)) : Work Equipment Control System : Work Equipment Control Lever (For Towing Winch)
01***20Bolt,(With Auto Emergency Steering)8
01***40Bolt,(With Air Conditioner)2
01***25Bolt,(For Canvas Canopy?Head Guard)4
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Komatsu : Dwc020_1c_s(S/N 60001-Up (D20s-6)) : Work Equipment Control System : Work Equipment Control Linkage (For Towing Winch)
01***16Bolt (With Air Heater & Conditioner)1
01***35Bolt,(For Position Fixing)1
01***25Bolt,(For Canvas Canopy?Head Guard)2
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Frequently asked questions

What engine does the Komatsu DWC020-1C-S use?

The Komatsu DWC020-1C-S (S/N 60001-UP) uses the D20S-6 engine series.

What is the operating weight of the Komatsu DWC020-1C-S?

Operating weights for the Komatsu bulldozer line range from 8 to 108 tonnes. Specific weight for the DWC020-1C-S varies by configuration and attachment package.

What replaced the Komatsu DWC020-1C-S?

The source text does not specify a direct successor model for the DWC020-1C-S. Komatsu continues to offer mid-size dozers with Intelligent Machine Control options.

What DWC020_1C_S(S/N 60001-UP (D20S-6)) owners discuss

What are the typical powertrain and hydraulic behaviors for the Komatsu DWC020_1C_S(S/N 60001-UP (D20S-6))?
The machine utilizes a closed-center hydraulic system with a variable displacement main pump. Common operator reports indicate that hydraulic functions may become sluggish when the oil is cold or when the hydraulic oil temperature exceeds normal operating ranges due to internal leakage. Engine power loss under heavy load is often traced to restricted air intake, clogged fuel filters, or turbocharger issues rather than internal engine failure. The powertrain is designed for high drawbar pull, but travel speed discrepancies between tracks often stem from final drive wear or track tension issues rather than hydraulic pump failure. Variations in hydraulic flow and engine torque curves vary by configuration/series based on the specific D20S-6 engine calibration and pump assembly installed.
What undercarriage or wear patterns are typical for this machine type?
Undercarriage wear is heavily influenced by the operating surface and track tension settings. Operators report accelerated wear on track rollers and idlers when operating in abrasive, rocky, or high-impact environments. Track chain elongation and sprocket tooth hooking are common wear indicators. Improper track tension, either too tight or too loose, significantly reduces component life. Ground engagement tools (cutting edges, side cutters) wear rapidly in high-abrasion soil and require frequent monitoring and rotation to maintain efficiency and protect the blade frame. The specific wear rate varies by configuration/series depending on the shoe width and ground conditions.
What are the engine quirks per the D20S-6 series?
The D20S-6 engine is a turbocharged, aftercooled diesel. Common quirks include sensitivity to fuel quality and water contamination, which can lead to injector wear and poor combustion. Operators note that black smoke during acceleration may indicate air filter restriction or fuel system issues. The engine requires regular monitoring of coolant levels and belt tension. Overheating can occur if the radiator and aftercooler cores are clogged with dust and debris. The engine's electronic control module manages fuel injection timing, and faults in sensors can lead to derating or shutdown. Specific calibration and emissions package details vary by configuration/series.
What are common electrical or sensor issues?
Electrical issues often manifest as intermittent starting, dashboard display failures, or random machine shutdowns. Faulty sensors, particularly those related to engine temperature, pressure, and speed, can trigger multiple warning codes and cause the machine to enter a derated power mode. Wiring harness damage, especially in areas subject to vibration or chafing, is a known issue. Ground connections must be clean and tight to prevent erratic sensor readings. Battery charging system faults, including alternator issues, can lead to low voltage warnings and electronic component malfunction. Sensor supply voltage errors are common diagnostic codes.
What should be checked when buying a used Komatsu DWC020_1C_S(S/N 60001-UP (D20S-6))?
Inspect the undercarriage for excessive wear on track shoes, rollers, idlers, and sprockets. Check the engine for oil leaks, coolant contamination, and proper compression. Test all hydraulic functions for speed and pressure, especially under load. Verify the operation of all safety interlocks, lights, and alarms. Check the condition of the cooling system, including the radiator, oil cooler, and aftercooler cores for blockage. Review the maintenance history for regular fluid and filter changes. Inspect the cab for signs of water intrusion or damage. Verify the serial number and engine model match the documentation. Have your dealer verify the exact configuration and service history.
What are the critical safety considerations for the Komatsu DWC020_1C_S(S/N 60001-UP (D20S-6))?
Ensure all safety locks and interlocks are functioning correctly before operation. Check the condition of the ROPS/FOPS structure for cracks or damage. Verify that the blade and ripper controls respond correctly and that the parking brake holds the machine securely. Inspect the hydraulic hoses and fittings for leaks or wear. Ensure the operator's seat and seatbelt are in good condition. Check the visibility from the operator's station and the condition of mirrors and cameras if equipped. Have your dealer verify the safety system calibration and structural integrity.
What are the fluid specifications and capacities for the Komatsu DWC020_1C_S(S/N 60001-UP (D20S-6))?
The machine requires specific Komatsu fluids for optimal performance. Engine oil should meet Komatsu specifications for the operating environment. Hydraulic oil should be Komatsu EO or equivalent high-quality hydraulic fluid. Coolant should be a long-life, silicate-free antifreeze meeting Komatsu standards. Transmission and final drive fluids should be Komatsu TO or equivalent. Fuel filter and oil filter replacement intervals are critical for engine longevity. Exact capacities and specifications vary by configuration/series and should be confirmed in the operation and maintenance manual for the specific serial number.

Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.

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