Komatsu DNH020_6L_CL(S/N 60001-UP (D20PLL-6))
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu DNH020-6L-CL (S/N 60001-UP, D20PLL-6) is a small crawler bulldozer designed for light construction, landscaping, and utility work. It belongs to the D20 series lineage, succeeding earlier D20A and D20P models and preceding the D20PLL-7 generation. Operating weights vary by configuration and series, typically ranging from 4,500 to 5,500 kg (9,921 to 12,126 lb). The machine is offered in standard and low-ground-pressure (LGP) configurations to suit varying soil conditions. It utilizes a compact, fuel-efficient diesel engine optimized for maneuverability in tight spaces while maintaining sufficient drawbar pull for grading and pushing tasks.
Across the D20 series generations, Komatsu refined the hydrostatic transmission for smoother power delivery and improved undercarriage durability to reduce ground pressure and track wear. The DNH020-6L-CL remains relevant in the used and parts market due to its widespread deployment in municipal and agricultural sectors. Its compact size allows for easy transport on standard trailers, while the modular design of the D20 series ensures that core powertrain and undercarriage components remain available and serviceable long after production ceased. The machine's simplicity and robust construction make it a cost-effective option for operators requiring reliable earthmoving capability without the footprint of larger dozers.
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 DNH020_6L_CL(S/N 60001-UP (D20PLL-6)) specifications
Engine
| Model | D20PLL-6 |
| Emissions Tier | Tier 4 Final / EU Stage V |
Weights
| Operating Weight | varies by configuration/series |
Dimensions
| Transport Length | varies by configuration/series |
| Transport Width | varies by configuration/series |
| Transport Height | varies by configuration/series |
| Track Gauge | varies by configuration/series |
| Ground Clearance | varies by configuration/series |
Performance
| Travel Speed (Forward) | varies by configuration/series |
| Travel Speed (Reverse) | varies by configuration/series |
| Drawbar Pull | varies by configuration/series |
| Gradeability | varies by configuration/series |
| Ground Pressure | varies by configuration/series |
Blades
| Blade Type Options | S, SU, A, VPAT |
| Blade Capacity | varies by configuration/series |
Service Capacities
| Fuel Tank | varies by configuration/series |
| Hydraulic System | varies by configuration/series |
| Engine Oil | varies by configuration/series |
| Cooling System | varies by configuration/series |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
Komatsu DNH020_6L_CL(S/N 60001-UP (D20PLL-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 DNH020_6L_CL(S/N 60001-UP (D20PLL-6)) beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize KOWA fluid analysis at every 500-hour interval to monitor engine wear metals and hydraulic contamination. Check coolant SCA concentration at 500 hours to prevent liner cavitation. Monitor hydraulic oil particle count and viscosity to detect pump or valve wear early. Inspect the air filter restriction indicator daily; replace the outer element at 1,000 hours or when indicated. Track fuel dilution and soot levels in engine oil to adjust change intervals based on actual operating conditions rather than fixed hours alone.
Corrective & Common Repairs
Address track tension issues promptly to prevent excessive wear on sprockets and rollers; check tension daily. Replace hydraulic return filters at 500 hours to protect sensitive control valves from debris. Inspect final drive oil for water ingress or metal shavings at 1,000 hours. Check blade cutting edge and end bit bolts for torque loss due to vibration. Inspect hydraulic hoses for chafing against the frame or undercarriage components, replacing any showing signs of cracking or leakage immediately.
Overhaul & Rebuild Points
Plan major powertrain overhauls around the 2,000-hour mark, including hydraulic oil changes and transmission service. Evaluate undercarriage components for wear at 1,000-hour intervals; replace rollers, idlers, and track chains as a set to ensure even load distribution. Inspect the turbocharger and valve adjustments at 1,000 hours to maintain engine performance. Structural inspections of the frame and mount points should be conducted at 1,000 hours to identify fatigue cracks before they propagate.
Seasonal & Environment Servicing
In cold climates, verify coolant freeze protection levels before winter. Drain water from the fuel separator daily to prevent injector issues. In dusty environments, clean radiator and oil cooler fins frequently to prevent overheating. Inspect the air cleaner pre-cleaner and outer element more often in high-dust conditions. Ensure the DEF tank is filled and the system is functioning correctly for Tier 4 compliance. Check track tension adjustments for temperature-induced changes in track length and undercarriage alignment.
DNH020_6L_CL(S/N 60001-UP (D20PLL-6)) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 103-60-23240 | Cartridge,Hydraulic Oil Filter | Hydraulic service | Check fitment → |
| 113-60-43320 | Cartridge,Hydraulic Oil Filter (D31s) | Hydraulic service | Check fitment → |
| 113-60-43321 | Cartridge,Hydraulic Oil Filter (D31s) | Hydraulic service | Check fitment → |
| 07002-03334 | O-Ring, At Transmission Filter | Scheduled service item | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
DNH020_6L_CL(S/N 60001-UP (D20PLL-6)) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| CA115 | Engine crankshaft speed sensor failure | Faulty speed sensor, broken wiring, or corroded connector at the pin connector | Replace the speed sensor and verify voltage at the pin connector |
| CA111 | Internal engine controller fault | Malfunction within the Electronic Control Module (ECM) | 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 check pump lines |
| AA10NX | Air cleaner clogging | Blocked air filter element | Replace the air filter |
| CA2311 | IMV solenoid valve failure | Faulty IMV solenoid or wire harness issue | Replace the IMV solenoid or inspect the wire harness |
| CA441 | Battery voltage too low | Weak battery, faulty alternator, or voltage regulator issue | Replace the alternator or battery; check the voltage regulator |
| B@BCNS | Engine coolant overheating | Low coolant level, blocked radiator fins, or fan belt failure | Check radiator fins, fan belt, and coolant level |
| B@HANS | Hydraulic oil overheating | Contaminated hydraulic oil, clogged filter, or cooler fan issue | Change hydraulic filter and oil; check cooler fan |
| CA122 | Intake air pressure high voltage | Faulty intake pressure sensor 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 |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
DNH020_6L_CL(S/N 60001-UP (D20PLL-6)) attachments & work tools
Blades
The DNH020-6L-CL (D20PLL-6) configuration supports standard (S), semi-universal (SU), and universal (A) blade types, with VPAT (Variable Pitch All-Terrain) availability varying by configuration and series. Typical widths and capacities for this class range from 3.0 to 3.5 meters (9.8 to 11.5 feet) with bucket capacities between 2.0 and 2.5 cubic meters (2.6 to 3.3 cubic yards). Factory spec sheets indicate that blade selection depends on the specific ground pressure and push force requirements of the D20PLL-6 engine variant.
Rippers
Multi-shank rippers are the standard option for this class, typically featuring three to five shanks for heavy ripping applications, while single-shank options are available for specialized rock work. Weights for ripper assemblies in this class range from 1,500 to 2,500 kilograms (3,300 to 5,500 pounds), varying by configuration and series. The DNH020-6L-CL frame is engineered to accommodate rear-mounted ripper shanks with hydraulic depth control cylinders.
Winches
Class-appropriate towing winches for the DNH020-6L-CL are typically rated for 100 to 150 kilonewtons (22,500 to 33,700 pounds) of pull force, mounted to the rear frame. These winches are hydraulic-driven and require specific front or rear hydraulic circuit connections for operation. Availability and exact rating vary by configuration and series based on the D20PLL-6 powertrain output.
Drawbars/Counterweights
Rear drawbars for this class are designed for heavy-duty towing and pushing, with mounting points compatible with the DNH020-6L-CL frame structure. Counterweights are available to balance front-mounted blade loads, typically adding 500 to 1,000 kilograms (1,100 to 2,200 pounds) to the rear. Specific drawbar geometry and counterweight options vary by configuration and series to maintain optimal track contact.
Cab/ROPS Guarding
Forestry and waste configurations for the DNH020-6L-CL require enhanced ROPS/FOPS guarding with heavy-duty screen mesh and protective grilles. Cab options include sealed units with positive pressure filtration to prevent debris ingress in high-contamination environments. Guarding specifications vary by configuration and series to meet ISO 3471 and ISO 3449 safety standards for forestry operations.
Hydraulic Arrangement
Front and rear tool compatibility for the DNH020-6L-CL relies on auxiliary hydraulic circuits with standard flow rates of 150 to 200 liters per minute (40 to 53 gallons per minute) at 150 bar (2,175 psi). Hydraulic connections for blades and rippers are typically located on the rear frame or side panels, depending on the configuration. Specific arrangement details vary by configuration and series based on the D20PLL-6 engine's hydraulic pump capacity.
All DNH020_6L_CL(S/N 60001-UP (D20PLL-6)) assemblies by section
Every catalogued assembly group for the Komatsu DNH020_6L_CL(S/N 60001-UP (D20PLL-6)). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Guard
Komatsu : Dnh020_6l_cl(S/N 60001-Up (D20pll-6)) : Guard : Rear Cover And Hydraulic Tank (For 3-Point Hitch)(#60001-60558)
| 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 : Dnh020_6l_cl(S/N 60001-Up (D20pll-6)) : Guard : Rear Cover And Hydraulic Tank (For 3-Point Hitch)(#60559-)
| 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 : Dnh020_6l_cl(S/N 60001-Up (D20pll-6)) : Work Equipment : 3-Point Hitch (1/2)
| 01***45 | Bolt, Mount Center Hinge Retainer (Lower) | 4 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 6 |
| 01***40 | Bolt (Op) | 8 |
Komatsu : Dnh020_6l_cl(S/N 60001-Up (D20pll-6)) : Work Equipment : 3-Point Hitch (2/2)
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 2 |
| 01***25 | Bolt,Without Revolution Sensor | 6 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
Komatsu : Dnh020_6l_cl(S/N 60001-Up (D20pll-6)) : Work Equipment : 3-Point Hitch Cylinder
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***32 | Washer,(With Auto Emergency Steering) | 2 |
| 07***70 | O-Ring,(For Intake Air Cover) | 1 |
Komatsu : Dnh020_6l_cl(S/N 60001-Up (D20pll-6)) : Work Equipment : Swing Drawbar (For 3-Point Hitch)
| 01***35 | Bolt,R.H. Outside And L.H. Inside | 8 |
| 01***40 | Bolt,R.H. Outside And L.H. Inside, Bolt | 4 |
| 01***42 | Washer,Spring (For Pedal Steering), Washer-Spring | 12 |
Work Equipment Control System
Komatsu : Dnh020_6l_cl(S/N 60001-Up (D20pll-6)) : Work Equipment Control System : Hydraulic Piping (Valve To Cylinder) (For 3-Point Hitch)
| 01***18 | Bolt | 1 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 1 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
Komatsu : Dnh020_6l_cl(S/N 60001-Up (D20pll-6)) : Work Equipment Control System : Hydraulic Tank And Filter (For 3-Point Hitch)
| 01***25 | Bolt,Without Revolution Sensor | 7 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 3 |
| 01***25 | Washer,Spring?For Additional Rear Lam | 7 |
Komatsu : Dnh020_6l_cl(S/N 60001-Up (D20pll-6)) : Work Equipment Control System : P.T.O. Control Lever (For 3-Point Hitch)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 2 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
Komatsu : Dnh020_6l_cl(S/N 60001-Up (D20pll-6)) : Work Equipment Control System : Work Equipment Control Lever (1/2) (For 3-Point Hitch)
| 01***16 | Bolt (With Air Heater & Conditioner) | 2 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 8 |
| 01***30 | Bolt,(For Mechanical Governor) | 1 |
Komatsu : Dnh020_6l_cl(S/N 60001-Up (D20pll-6)) : Work Equipment Control System : Work Equipment Control Lever (2/2) (For 3-Point Hitch)
| 01***05 | Nut,L.H. Thread (D31s) | 1 |
| 01***05 | Nut,L.H. (For Trimming Dozer) | 1 |
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 1 |
Komatsu : Dnh020_6l_cl(S/N 60001-Up (D20pll-6)) : Work Equipment Control System : Work Equipment Valve (1/2) (For 3-Point Hitch)
| 01***16 | Bolt (Op) | 4 |
| 01***25 | Bolt, Seal Cover Mounting | 4 |
| 01***30 | Bolt | 4 |
Komatsu : Dnh020_6l_cl(S/N 60001-Up (D20pll-6)) : Work Equipment Control System : Work Equipment Valve (2/2) (For 3-Point Hitch)
| 01***08 | Nut (Op) | 1 |
| 07***11 | O-Ring (Kit) | 1 |
| 07***15 | O-Ring,(Without Boom Kickout) | 1 |
Frequently asked questions
What engine does the DNH020-6L-CL use?
The DNH020-6L-CL (S/N 60001-UP, D20PLL-6) uses a Komatsu diesel engine specific to the D20PLL-6 series. Exact displacement and horsepower ratings vary by configuration and series; consult the machine's serial plate or factory spec sheet for precise engine model and output data.
What is the operating weight?
Operating weight varies by configuration and series, typically ranging from 4,500 to 5,500 kg (9,921 to 12,126 lb). Specific weight depends on the blade type, counterweight, track shoe width, and regional emissions package installed.
What model replaced the DNH020-6L-CL?
The DNH020-6L-CL is part of the D20 series lineage. It was succeeded by the D20PLL-7 generation dozers. Komatsu's product evolution moved from the D20 series to newer generations with updated emissions compliance and refined powertrain technology.
What DNH020_6L_CL(S/N 60001-UP (D20PLL-6)) owners discuss
What are the typical powertrain and hydraulic behaviors for the Komatsu DNH020_6L_CL(S/N 60001-UP (D20PLL-6))?
What undercarriage or wear patterns are typical for this machine type?
What engine quirks are associated with the DNH020_6L_CL(S/N 60001-UP (D20PLL-6)) series?
What are common electrical or sensor issues reported for this model?
What should be checked when buying a used DNH020_6L_CL(S/N 60001-UP (D20PLL-6))?
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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