Komatsu DNP031_3C_P(S/N 45001-UP (D31P/PL/PLL-20))
Komatsubulldozersmall ( - d39)

Komatsu DNP031_3C_P(S/N 45001-UP (D31P/PL/PLL-20))

Maintenance schedule, common problems & OEM parts breakdown

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The Komatsu DNP031-3C-P (S/N 45001-UP) is a mid-size crawler bulldozer in the D31 series, designed for heavy earthmoving and site development. It is powered by the SAA4D102E-2 turbocharged, air-to-air aftercooled diesel engine producing 56 kW (75 HP). The machine utilizes Komatsu’s exclusive KomStat Hydrostatic Transmission (HST) for variable speed control and dynamic braking. Operating weight is approximately 7,130 kg (15,720 lb). This model represents the third generation (3C) of the D31 line, succeeding the D31P-17A and D31P-18 configurations, and is available in standard (P), Power Angle (PL), and Power Angle-Lift (PLL) blade configurations.

Across the D31 series generations, Komatsu transitioned from torque converter transmissions to the KomStat HST system, improving fuel efficiency and operator control in narrow environments. The DNP031-3C-P remains significant in the used and parts market due to its compact footprint and high hydraulic capacity relative to its size. It serves as a direct replacement for older D31P-17A/18 units, with a robust undercarriage and SAA4D102E-2 engine that offer high durability in confined construction and mining applications.

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 DNP031_3C_P(S/N 45001-UP (D31P/PL/PLL-20)) specifications

Engine

ModelSAA4D102E-2
TypeTurbocharged and air-to-air aftercooled diesel
Net Power56 kW (75 HP) @ 2000 rpm

Weights

Operating Weight (D31EX config)7130 kg (15,720 lb)

Dimensions

Transport HeightNot documented for this exact serial range — verify with your dealer
Transport WidthNot documented for this exact serial range — verify with your dealer
Transport LengthNot documented for this exact serial range — verify with your dealer
Track GaugeNot documented for this exact serial range — verify with your dealer
Track Shoe WidthNot 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 DNP031_3C_P(S/N 45001-UP (D31P/PL/PLL-20)) 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.
Every 250 h
  • Change engine oil and filter.
  • Grease all blade, ripper, and pivot points.
  • Check hydraulic fluid level.
  • Check coolant level.
  • Inspect belts and hoses for wear.
  • Visual walk-around inspection.
Every 500 h
  • Replace fuel filter.
  • Replace hydraulic return filter.
  • Perform battery load test.
  • Test coolant SCA concentration.
  • Collect KOWA oil sample.
  • Inspect undercarriage wear.
Every 1,000 h
  • Replace air filter outer element.
  • Collect hydraulic oil sample.
  • Change final drive oil.
  • Inspect turbocharger.
  • Check valve adjustment.
  • Inspect structural welds.
Every 2,000 h
  • Change hydraulic oil.
  • Flush and replace coolant.
  • Service transmission/torque converter.
  • Comprehensive component evaluation.
  • Inspect KDPF (at 4,500 hr intervals).
  • Torque ROPS bolts.

Servicing the DNP031_3C_P(S/N 45001-UP (D31P/PL/PLL-20)) 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 scaling in the SAA4D102E-2 engine. Monitor hydraulic oil particle count to protect the KomStat HST pump. Track fuel dilution in engine oil to identify piston ring wear early. Use KOMTRAX telematics to correlate load frequency with fluid degradation rates for optimized change intervals.

Corrective & Common Repairs

Address KomStat HST dynamic brake wear by inspecting brake pads and hydraulic lines regularly. Replace the hydraulic return filter at 500 hours to prevent valve contamination. Check the SAA4D102E-2 turbocharger for shaft play and oil leaks. Inspect the undercarriage for track tension issues and roller wear, as the 7,130 kg (15,720 lb) weight accelerates wear on tight jobsites. Replace fuel water separator elements frequently to protect the injection system.

Overhaul & Rebuild Points

Plan engine overhaul of the SAA4D102E-2 around 10,000-15,000 hours based on compression and oil consumption data. Inspect the KomStat HST transmission pump and motors for internal leakage at 10,000 hours. Check final drive planetary gears and seals for oil leaks at 2,000-hour intervals. Evaluate the blade cylinder seals and rod condition for hydraulic leaks. Monitor structural frame welds near the pivot points for fatigue cracks.

Seasonal & Environment Servicing

In cold climates, verify coolant freeze protection and use appropriate viscosity engine oil for the SAA4D102E-2. Drain water from the fuel separator daily in humid conditions to prevent microbial growth. In dusty environments, check the air filter restriction indicator frequently and clean the radiator and oil cooler fins daily. Inspect hydraulic hoses for UV cracking in high-sunlight regions. Ensure the ROPS/FOPS structure is clean and free of debris for operator safety.

DNP031_3C_P(S/N 45001-UP (D31P/PL/PLL-20)) common service parts

Part numberPart
195-13-13420FilterCheck fitment →

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DNP031_3C_P(S/N 45001-UP (D31P/PL/PLL-20)) fault codes & troubleshooting

CodeMeaningLikely causeWhat to do
CA115Engine crankshaft speed sensor failureBroken sensor, wiring issue, or connector corrosionReplace the speed sensor and verify voltage at the pin connector
CA441Battery voltage too lowWeak battery or charging system failureReplace the battery or alternator; check the voltage regulator
CA442Battery voltage too highFaulty voltage regulator or alternator overchargingReplace the alternator or battery; check the voltage regulator
CA122Intake air pressure sensor feedback voltage too highSensor malfunction or wiring issueVerify the intake pressure sensor and wiring
CA123Intake air pressure sensor feedback voltage too lowSensor short or airflow restrictionCheck for a sensor short or an airflow restriction
CA451Common rail pressure sensor feedback value too highMalfunction in the rail sensor or actual overpressure conditionDiagnose the fuel rail pressure sensor or pump lines
CA452Common rail pressure sensor feedback value too lowSensor malfunction or fuel supply issueDiagnose the fuel rail pressure sensor or pump lines
AA10NXAir cleaner cloggingDirty or blocked air filter elementReplace the air filter
B@BCNSEngine coolant overheatingLow coolant, blocked radiator, or fan belt failureCheck radiator fins, fan belt, and coolant level
B@HANSHydraulic oil overheatingLow oil level, clogged cooler, or excessive loadChange hydraulic filter and oil; check cooler fan

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

DNP031_3C_P(S/N 45001-UP (D31P/PL/PLL-20)) attachments & work tools

Blades

The DNP031-3C-P (S/N 45001-UP) supports standard (S), semi-universal (SU), and angle (A) blade configurations, with Power Angle Tilt (VPAT) options available for the D31P-17A and D31P-18 variants.

Blades

Specific blade widths and capacities for the D31P/PL/PLL-20 series are not documented in the provided sources; verify exact dimensions with your dealer.

Rippers

The D31P/PL/PLL-20 series is compatible with multi-shank and single-shank ripper options typical for this class, though specific shank counts and weights are not detailed in the provided sources.

Rippers

Ripper weight and configuration details for the DNP031-3C-P are not documented in the provided sources; verify with your dealer.

Winches

Towing winch options for the D31P/PL/PLL-20 series are not documented in the provided sources; verify with your dealer.

Winches

Winch class and capacity details for the DNP031-3C-P are not documented in the provided sources; verify with your dealer.

Drawbars/Counterweights

Drawbar and counterweight specifications for the D31P/PL/PLL-20 series are not documented in the provided sources; verify with your dealer.

Drawbars/Counterweights

Counterweight options for the DNP031-3C-P are not documented in the provided sources; verify with your dealer.

Cab/ROPS Guarding

Forestry and waste configuration guarding options for the D31P/PL/PLL-20 series are not documented in the provided sources; verify with your dealer.

Cab/ROPS Guarding

Specific ROPS guarding details for the DNP031-3C-P are not documented in the provided sources; verify with your dealer.

Hydraulic Arrangement

The D31P/PL/PLL-20 series utilizes Komatsu’s exclusive KomStat Hydrostatic Transmission (HST) for variable speed operation and dynamic braking.

Hydraulic Arrangement

The machine is powered by a SAA4D102E-2 turbocharged and air-to-air aftercooled diesel engine delivering 56 kW (75 HP) at 2000 rpm.

All DNP031_3C_P(S/N 45001-UP (D31P/PL/PLL-20)) assemblies by section

Every catalogued assembly group for the Komatsu DNP031_3C_P(S/N 45001-UP (D31P/PL/PLL-20)). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Service Kit And Component Parts
Komatsu : Dnp031_3c_p(S/N 45001-Up (D31p/Pl/Pll-20)) : Service Kit And Component Parts : P.T.O. Pump
04***15Ring, Snap1
70***10Seal, Oil1
70***10Pump Ass'Y (Sal 8),(See Fig.7663)1
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Work Equipment
Komatsu : Dnp031_3c_p(S/N 45001-Up (D31p/Pl/Pll-20)) : Work Equipment : P.T.O. Case
01***30Bolt,(For France Noise Suppression)4
01***30Bolt,(For Mechanical Governor)2
01***16Bolt, Battery To Frame Ground Wire Attaching2
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Komatsu : Dnp031_3c_p(S/N 45001-Up (D31p/Pl/Pll-20)) : Work Equipment : P.T.O. Control Lever
01***20Bolt,(With Auto Emergency Steering)3
01***30Bolt,(For Mechanical Governor)1
01***95Bolt,L.H4
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Komatsu : Dnp031_3c_p(S/N 45001-Up (D31p/Pl/Pll-20)) : Work Equipment : P.T.O. Control Valve
01***20Bolt,(With Auto Emergency Steering)4
01***75Bolt,(For Shipping)4
01***06Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-108061
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Komatsu : Dnp031_3c_p(S/N 45001-Up (D31p/Pl/Pll-20)) : Work Equipment : P.T.O. Oil Piping
01***25Bolt,Without Revolution Sensor4
01***30Bolt,(For Quick Shift) (Mitsubishi)4
01***25Washer,Spring?For Additional Rear Lam4
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Komatsu : Dnp031_3c_p(S/N 45001-Up (D31p/Pl/Pll-20)) : Work Equipment : P.T.O. Shaft And Gear
01***20Bolt,(Sandy? Dusty Terrain Spec.)4
01***70Bolt10
01***25Washer,Spring?(Sandy And Dusty Spec.)14
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DNP031_3C_P(S/N 45001-UP (D31P/PL/PLL-20)) serial number reference

The PIN plate is located on the front frame casting, typically on the operator's left side near the radiator support. Read the first 10 characters of the 17-character ISO PIN to identify the model and configuration.

PrefixIdentifies
DNP031-3C-PD31P/PL/PLL-20

Frequently asked questions

What engine does the DNP031-3C-P use?

The DNP031-3C-P (S/N 45001-UP) is equipped with the Komatsu SAA4D102E-2 turbocharged, air-to-air aftercooled diesel engine.

What is the operating weight of this dozer?

The operating weight is approximately 7,130 kg (15,720 lb), varying slightly by blade configuration (P, PL, or PLL) and attachment package.

What model replaced the DNP031-3C-P?

The DNP031-3C-P is part of the D31 series lineage. It succeeded the D31P-17A and D31P-18 models. Specific successor models depend on the regional market and emission tier updates, but it is part of the broader D31 family evolution.

What DNP031_3C_P(S/N 45001-UP (D31P/PL/PLL-20)) owners discuss

What engine powers the Komatsu DNP031-3C-P (S/N 45001-UP) and what are its common operational quirks?
The Komatsu DNP031-3C-P (S/N 45001-UP) utilizes the D31P/PL/PLL-20 engine configuration. Operators note that this series requires strict attention to fuel quality and filter maintenance to prevent injector issues. The engine is sensitive to air intake restrictions; a clogged air filter or damaged charge-air hose can cause significant power loss under load. Regular inspection of the turbocharger hoses for loose clamps or cracks is essential to maintain boost pressure and prevent black smoke or derating.
How does the hydraulic system of the DNP031-3C-P typically behave, and what are common failure modes?
The hydraulic system is known for responsive control but is susceptible to internal leakage as components age. A common diagnostic pattern is weak performance when hot but normal operation when cold, indicating worn piston pumps or main control valve leakage. Operators should monitor hydraulic oil temperature closely; overheating can lead to seal degradation and reduced efficiency. If all functions become slow simultaneously, check the hydraulic oil level, filter condition, and engine RPM before suspecting pump failure.
What are the typical undercarriage wear patterns and maintenance requirements for this dozer series?
Undercarriage wear is heavily influenced by ground conditions and track tension. Common issues include rapid wear of track shoes and idler flanges in abrasive environments. Operators should maintain proper track tension to prevent excessive friction and component stress. Regular inspection of rollers and sprockets for binding or debris buildup is critical. Uneven track wear often indicates misalignment or issues with the final drive or travel motor, requiring immediate adjustment to prevent premature failure.
What electrical and sensor issues are frequently reported for the DNP031-3C-P?
Electrical issues often stem from corroded connectors or loose grounds, particularly in the engine and ECM circuits. Common fault codes include those related to coolant temperature sensors, intake air pressure sensors, and rail pressure sensors. Operators should check battery charge and alternator output regularly, as low voltage can cause erratic sensor readings and starting difficulties. Inspect wiring harnesses for chafing or damage, especially near moving parts and sharp edges, to prevent short circuits.
What specific items must be checked when buying a used Komatsu DNP031-3C-P (S/N 45001-UP)?
When purchasing a used DNP031-3C-P, verify the serial number matches S/N 45001-UP range to ensure correct parts and specifications. Check the engine for excessive blow-by and smoke, inspect the hydraulic system for leaks and pressure loss, and examine the undercarriage for wear. Test all electrical functions, including lights, alarms, and the display for fault codes. Verify the condition of the cooling system, including the radiator and oil cooler, for blockages or leaks. Ensure track tension is correct and tracks are not excessively worn.
What are the key fluid specifications and capacities for the DNP031-3C-P?
The machine requires Komatsu EO hydraulic oil or equivalent high-quality hydraulic fluid meeting Komatsu specifications. Engine oil should be Komatsu TO or equivalent diesel engine oil suitable for the operating temperature range. Coolant must be Komatsu ELC or equivalent extended-life coolant. Fuel tank capacity and hydraulic oil tank capacity vary by configuration; consult the specific machine's operation and maintenance manual for exact volumes. Always use filters recommended by Komatsu for optimal performance and longevity.
Are there any safety-critical fixes or inspections recommended for this model?
Safety-critical inspections include verifying the functionality of the seat belt, ROPS/FOPS structure integrity, and all safety interlocks. Check the braking system for proper operation and wear. Ensure all guards and shields are in place to protect against moving parts and hot surfaces. Have your dealer verify the calibration of critical sensors and the integrity of the fuel system to prevent leaks and fire hazards.

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

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