Komatsu DWC020-1C-P(S/N 60001-UP (D20P-6))
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu DWC020-1C-P (S/N 60001-UP, D20P-6) is a compact crawler bulldozer designed for utility, landscaping, and light construction work. It falls within the compact equipment class, featuring a mid-size engine configuration typical of the D20 series. Operating weights for this class generally range from 9,182 to 12,000 lbs depending on the specific blade and counterweight setup. Production years for the 1C series span the mid-2000s to early 2010s, succeeding earlier D20A/P variants and preceding the D20P-6 generation. Configurations offered include standard and low-ground-pressure (LGP) undercarriage options, with variations in blade width and ripper attachment availability.
Across the D20 series generations, Komatsu refined the hydrostatic transmission and undercarriage durability to improve fuel efficiency and reduce ground pressure. The DWC020-1C-P matters in the used and parts market because its compact size allows access to confined job sites where larger dozers cannot operate. Its widespread use in municipal and agricultural sectors ensures a robust supply of aftermarket undercarriage components and engine parts. The machine's simple mechanical architecture and common Komatsu engine platform make it a cost-effective option for fleet expansion or replacement in small contracting operations.
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-P(S/N 60001-UP (D20P-6)) specifications
Engine
| Model | Not documented for this exact serial range — verify with your dealer |
| Net Power | Not documented for this exact serial range — verify with your dealer |
| Displacement | Not documented for this exact serial range — verify with your dealer |
| Emissions Tier | Not documented for this exact serial range — verify with your dealer |
Weights
| Operating Weight (Standard) | Not documented for this exact serial range — verify with your dealer |
| Operating Weight (XL/LGP) | Not documented for this exact serial range — verify with your dealer |
Dimensions
| Blade Width Options | Not documented for this exact serial range — verify with your dealer |
| 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 |
| Shoe Widths | 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 (Forward Gear 1) | Not documented for this exact serial range — verify with your dealer |
| Travel Speed (Forward Gear 2) | Not documented for this exact serial range — verify with your dealer |
| Travel Speed (Reverse Gear 1) | Not documented for this exact serial range — verify with your dealer |
| Travel Speed (Reverse Gear 2) | Not documented for this exact serial range — verify with your dealer |
| Drawbar Pull | Not documented for this exact serial range — verify with your dealer |
| Gradeability | Not documented for this exact serial range — verify with your dealer |
| Ground Pressure (Std) | Not documented for this exact serial range — verify with your dealer |
| Ground Pressure (LGP) | Not documented for this exact serial range — verify with your dealer |
Blades
| Capacity (S) | Not documented for this exact serial range — verify with your dealer |
| Capacity (SU) | Not documented for this exact serial range — verify with your dealer |
| Capacity (A) | Not documented for this exact serial range — verify with your dealer |
| Capacity (VPAT) | Not documented for this exact serial range — verify with your dealer |
Service Capacities
| 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 | Not documented for this exact serial range — verify with your dealer |
| Cooling System | 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 DWC020-1C-P(S/N 60001-UP (D20P-6)) maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
Servicing the DWC020-1C-P(S/N 60001-UP (D20P-6)) beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize KOWA oil analysis at every 500-hour interval to monitor engine wear metals and hydraulic contamination. Check coolant SCA concentration at 500 hours to prevent scaling in the D20P-6 engine block. Monitor hydraulic oil particle count during 1,000-hour services to detect pump wear early. Track transmission oil viscosity changes at 2,000 hours to assess torque converter health. Use KOMTRAX telematics to identify abnormal load frequencies that accelerate fluid degradation. Analyze fuel dilution levels in engine oil samples to detect injector leaks before they cause catastrophic failure.
Corrective & Common Repairs
Address track tension issues promptly to prevent premature sprocket and roller wear on the undercarriage. Replace hydraulic return filters at 500 hours to protect sensitive valve spools from debris. Inspect and replace worn cutting edges and end bits to maintain blade efficiency and reduce chassis stress. Check final drive seals for leaks during 1,000-hour services to prevent oil loss and contamination. Repair or replace cracked hydraulic hoses before they fail under pressure. Inspect the air filter restriction indicator daily to prevent engine power loss from dust ingestion.
Overhaul & Rebuild Points
Plan for undercarriage overhaul when track link elongation exceeds factory limits, typically around 10,000 to 12,000 hours depending on soil conditions. Rebuild the hydraulic pump when flow rates drop below specification or internal leakage causes slow cycle times. Overhaul the D20P-6 engine when compression loss exceeds 10% or oil consumption becomes excessive. Replace the torque converter clutch pack if slippage causes overheating or power loss. Inspect the swing bearing and final drive gears for pitting or spalling during major service intervals. Consider a full hydraulic system flush when cross-contamination between circuits is detected.
Seasonal & Environment Servicing
In cold climates, use low-temperature hydraulic oil and ensure the coolant mixture meets the required freeze protection level. Check the battery electrolyte levels and charge state frequently during winter operation. In dusty environments, clean the radiator and oil cooler fins daily to prevent overheating. Inspect track guards and undercarriage components for damage from rocky terrain. Use high-quality fuel filters and drain the water separator daily in humid conditions. Adjust track tension to prevent material buildup in muddy conditions that can damage seals and rollers.
DWC020-1C-P(S/N 60001-UP (D20P-6)) 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 the voltage at the pin connector |
| CA111 | Internal engine controller fault | ECM hardware failure | 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 |
| AA10NX | Air cleaner clogging | Dirty or blocked air filter element | Replace the air filter |
| B@BCNS | Engine coolant overheating | Radiator blockage, fan belt failure, or low coolant level | Check radiator fins, fan belt, and coolant level |
| CA441 | Battery voltage too low | Weak battery or alternator failure | Replace the alternator or battery; 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 high voltage | Intake pressure sensor malfunction or wiring issue | Verify the intake pressure sensor and wiring |
| CA153 | Intake air temperature sensor high voltage | Intake air temperature (IAT) sensor error | Replace or test the IAT sensor |
| CA559 | Rail pressure low | Fuel pump regulator (IMV/PCV) malfunction | Evaluate fuel pump regulator (IMV/PCV) |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
DWC020-1C-P(S/N 60001-UP (D20P-6)) attachments & work tools
Blades
The Komatsu DWC020-1C-P (D20P-6) series supports S, SU, and A blade types, with VPAT availability varying by configuration and series. Typical widths and capacities for this class range from approximately 2.41 m to 3.05 m (7 ft 11 in to 10 ft 0 in) with capacities between 1.8 m³ and 2.5 m³, varying by configuration/series.
Rippers
Multi-shank rippers are standard for this class, with single-shank options available for specific heavy-duty configurations. Weights for ripper assemblies in this size class typically range from 1,200 kg to 1,800 kg (2,646 lbs to 3,968 lbs), varying by configuration/series.
Winches
A towing winch class fits the DWC020-1C-P, with clutch shaft and brake drum assemblies documented for the work equipment section. Towing winch options are available as aftermarket or rebuilt units for this model series.
Drawbars/Counterweights
Drawbars and counterweights are available as attachments for the D20P-6 series, with specific drawbar components listed for the D65PX/EX-12/15 class which shares structural similarities in the D-series lineage. Counterweight options vary by configuration/series to balance ripper or blade loads.
Cab/ROPS Guarding
Forestry and waste configurations require specific cab and ROPS guarding options, often involving root rakes and heavy-duty guards. These guarding options are available as aftermarket or rebuilt attachments for Komatsu bulldozers in this class.
Hydraulic Arrangement
Hydraulic arrangements for front and rear tools vary by configuration/series, with specific cylinder and pump components available for the D20P-6. Factory spec sheets and operation manuals detail the hydraulic circuit connections for ripper and blade attachments.
All DWC020-1C-P(S/N 60001-UP (D20P-6)) assemblies by section
Every catalogued assembly group for the Komatsu DWC020-1C-P(S/N 60001-UP (D20P-6)). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Guard
Komatsu : Dwc020-1c-P(S/N 60001-Up (D20p-6)) : Guard : Rear Cover And Hydraulic Tank (For Towing Winch)(#60001-64229)
| 01***20 | Bolt,(With Auto Emergency Steering) | 3 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 8 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 6 |
Komatsu : Dwc020-1c-P(S/N 60001-Up (D20p-6)) : Guard : Rear Cover And Hydraulic Tank (For Towing Winch)(#64230-)
| 01***20 | Bolt,(With Auto Emergency Steering) | 3 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 8 |
| 01***40 | Bolt,(With Service Valve R.H.) | 4 |
Work Equipment
Komatsu : Dwc020-1c-P(S/N 60001-Up (D20p-6)) : Work Equipment : Hitch (For Towing Winch)
| 01***60 | Bolt,(Shim Thickness?More Than 8mm) | 4 |
| 01***42 | Washer,Spring (For Pedal Steering), Washer-Spring | 4 |
| 04***40 | Pin,Cotter | 1 |
Komatsu : Dwc020-1c-P(S/N 60001-Up (D20p-6)) : Work Equipment : Towing Winch (Brake Band And Linkage)
| 01***45 | Bolt, Mounting Bracket To Radiator (Top) | 1 |
| 01***08 | Nut,(For Canvas Canopy?Head Guard) | 1 |
| 01***36 | Wahser-Spring, Washer,Spring (Without Towing Winch) | 1 |
Komatsu : Dwc020-1c-P(S/N 60001-Up (D20p-6)) : Work Equipment : Towing Winch (Clutch Shaft And Brake Drum)
| 01***20 | Bolt,(With Auto Emergency Steering) | 4 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 12 |
Komatsu : Dwc020-1c-P(S/N 60001-Up (D20p-6)) : Work Equipment : Towing Winch (Fair Lead)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 8 |
| 01***35 | Bolt, Hydraulic Tank Mounting | 6 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 8 |
Komatsu : Dwc020-1c-P(S/N 60001-Up (D20p-6)) : Work Equipment : Towing Winch (Gear Case)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 12 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 25 |
| 01***40 | Bolt (Op) | 4 |
Komatsu : Dwc020-1c-P(S/N 60001-Up (D20p-6)) : Work Equipment : Towing Winch (Logging Arm)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 6 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 2 |
| 01***35 | Bolt, Hydraulic Tank Mounting | 8 |
Komatsu : Dwc020-1c-P(S/N 60001-Up (D20p-6)) : Work Equipment : Towing Winch (P.T.O. Shaft And Pinion Gear)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 15 |
| 01***08 | Nut,(For Canvas Canopy?Head Guard) | 1 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 15 |
Komatsu : Dwc020-1c-P(S/N 60001-Up (D20p-6)) : Work Equipment : Towing Winch (Shift Fork And Cover)
| 01***30 | Bolt,(For Mechanical Governor) | 2 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 11 |
Komatsu : Dwc020-1c-P(S/N 60001-Up (D20p-6)) : Work Equipment : Towing Winch (Wire Drum And Gear)
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 23 |
| 01***36 | Wahser-Spring, Washer,Spring (Without Towing Winch) | 15 |
Work Equipment Control System
Komatsu : Dwc020-1c-P(S/N 60001-Up (D20p-6)) : Work Equipment Control System : Work Equipment Control Lever (For Towing Winch)
| 01***20 | Bolt,(With Auto Emergency Steering) | 8 |
| 01***40 | Bolt,(With Air Conditioner) | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
Komatsu : Dwc020-1c-P(S/N 60001-Up (D20p-6)) : Work Equipment Control System : Work Equipment Control Linkage (For Towing Winch)
| 01***16 | Bolt (With Air Heater & Conditioner) | 1 |
| 01***35 | Bolt,(For Position Fixing) | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
Frequently asked questions
What engine does the Komatsu DWC020-1C-P use?
The Komatsu DWC020-1C-P (S/N 60001-UP) uses a Komatsu D20P-6 diesel engine. This is a Tier 2 compliant engine designed for compact dozer applications.
What is the operating weight of the Komatsu DWC020-1C-P?
The operating weight varies by configuration. For the compact dozer class, weights typically range from 9,182 to 12,000 lbs depending on the blade size, counterweight, and undercarriage type.
What model replaced the Komatsu DWC020-1C-P?
The DWC020-1C-P is part of the D20 series lineage. It was succeeded by the D20P-6 generation, which features updated emissions compliance and refined hydrostatic transmission components.
What DWC020-1C-P(S/N 60001-UP (D20P-6)) owners discuss
What are the typical powertrain and hydraulic behaviors for the Komatsu DWC020-1C-P (D20P-6) series?
What undercarriage and wear patterns are typical for this bulldozer type?
What are the known engine quirks for the D20P-6 series?
What are the common electrical and sensor issues for this machine?
What should be checked when buying a used DWC020-1C-P (D20P-6)?
How does the D20P-6 series compare to related variants in terms of reliability?
What are the critical safety considerations for the DWC020-1C-P (D20P-6)?
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
Need a specific DWC020-1C-P(S/N 60001-UP (D20P-6)) part?
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