Komatsu DWT037_1B_P1(S/N 45001-UP (D31P-20))
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu DWT037-1B-P1 (S/N 45001-UP, D31P-20) is a small crawler bulldozer in the D31 series lineage. Operating weights for this class range from approximately 13.8 to 112.62 tonnes across the broader dozer lineup, with specific weights varying by configuration. The machine is part of the DWT037-1B series, which includes variants such as the DWT037-1B-D1, DWT037-1B-E1, and DWT037-1B-S1. Configurations offered include standard and low-ground-pressure (PX) models. Production years for the D31P-20 series are not explicitly documented in the provided sources, but the D31 series generally spans the late 1990s to early 2000s. The D31P-20 succeeded earlier D31A/AM variants and was followed by newer generations in the D31Q/S/E series.
Across the D31 series generations, changes included updates to engine emissions compliance, hydraulic system efficiency, and undercarriage durability. The D31P-20 variant specifically denotes a particular engine and emission tier configuration within the DWT037-1B family. In the used and parts market, the DWT037-1B-P1 remains relevant due to its compact size for site development and the availability of shared components with other D31 series models. The machine's significance lies in its balance of power and maneuverability, making it suitable for light construction and land clearing. Parts availability is supported by the extensive D31 series production run, with specific catalogs available for the S/N 45001-UP range.
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 DWT037_1B_P1(S/N 45001-UP (D31P-20)) specifications
Engine
| Engine Model | D31P-20 |
| Emissions Tier | Tier 4 Final / EU Stage V |
Weights
| Operating Weight | Not documented for this exact serial range — verify with your dealer |
Dimensions
| 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 |
| Track Shoe Width | 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 | 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 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 | Not documented for this exact serial range — verify with your dealer |
Blades
| Blade Type Options | S, SU, A, VPAT |
| Blade Capacity | Not documented for this exact serial range — verify with your dealer |
Service Capacities
| Fuel Tank Capacity | Not documented for this exact serial range — verify with your dealer |
| Hydraulic System Capacity | Not documented for this exact serial range — verify with your dealer |
| Engine Oil Capacity | Not documented for this exact serial range — verify with your dealer |
| Cooling System Capacity | 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 DWT037_1B_P1(S/N 45001-UP (D31P-20)) maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
Servicing the DWT037_1B_P1(S/N 45001-UP (D31P-20)) 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. The DWT037-1B-P1 relies on Komatsu Genuine Lubricants, including TO powertrain oil and HO hydraulic oil, to maintain component longevity. Regular sampling allows for early detection of contamination or viscosity changes in the final drive and transmission systems, preventing catastrophic failure in the D31P-20 powertrain.
Corrective & Common Repairs
Address common DWT037-1B-P1 issues by inspecting the hydraulic return filter and fuel water separator at 500-hour intervals. Check the air filter outer element for clogging, which can strain the D31P-20 engine. Inspect track tension and undercarriage wear, as improper tension accelerates sprocket and roller wear. Verify belt and hose conditions to prevent coolant or hydraulic leaks, ensuring the machine remains operational in demanding earthmoving applications.
Overhaul & Rebuild Points
Plan major overhauls for the DWT037-1B-P1 at 2,000-hour intervals, including hydraulic oil changes and transmission servicing. Inspect the turbocharger and perform valve adjustments at 1,000 hours to maintain engine performance. Evaluate final drive oil condition and replace as needed. Structural inspections of the chassis and blade pivot points are critical to ensure the integrity of the D31P-20 frame under heavy load conditions.
Seasonal & Environment Servicing
Adjust maintenance for the DWT037-1B-P1 based on environmental conditions. In cold climates, ensure coolant concentration is adequate to prevent freezing and check DEF levels for Tier 4 compliance. In dusty environments, inspect the air filter restriction indicator more frequently and clear debris from the radiator and oil cooler fins daily. Monitor track shoe condition for wear on abrasive surfaces and adjust tension to prevent slippage or excessive wear on the undercarriage components.
DWT037_1B_P1(S/N 45001-UP (D31P-20)) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 07000-02080 | O-Ring,Hydraulic Oil Filter | Hydraulic service | Check fitment → |
| 195-13-13420 | Filter | Scheduled service item | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
DWT037_1B_P1(S/N 45001-UP (D31P-20)) 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 |
| CA441 | Battery voltage too low | Alternator failure, battery degradation, or loose connections | Replace the alternator or battery; check the voltage regulator |
| CA442 | Battery voltage too high | Voltage regulator malfunction or alternator overcharging | Replace the alternator or battery; check the voltage regulator |
| CA111 | Internal engine controller fault | ECM hardware failure or critical internal error | Replace or reprogram the ECM |
| CA122 | Intake air pressure high voltage | Sensor malfunction or actual overpressure condition | 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 |
| CA451 | Common rail pressure sensor feedback value too high | Fuel rail sensor malfunction or actual overpressure | Diagnose the fuel rail pressure sensor or pump lines |
| CA452 | Common rail pressure sensor feedback value too low | Fuel rail sensor malfunction or low pressure 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 |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
DWT037_1B_P1(S/N 45001-UP (D31P-20)) attachments & work tools
Blades
The DWT037_1B_P1(S/N 45001-UP (D31P-20)) bulldozer is classified as a small crawler tractor in the D31 series. Factory spec sheets for this range indicate availability of standard (S), semi-universal (SU), and angle (A) blade types, with VPAT (Variable Position Angle Tilt) configurations available for specific grading applications. Typical widths for this class range from 2.41 m (7 ft 11 in) to 3.05 m (10 ft 0 in), with capacities varying by configuration and series.
Rippers
Multi-shank rippers are the standard option for this class, with single-shank variants available for heavy-duty rock work. Factory specifications for the D31P-20 series list ripper weights typically between 1,200 kg (2,646 lbs) and 1,800 kg (3,968 lbs), varying by configuration and series.
Winches
Class-appropriate towing winches are available for the DWT037_1B_P1(S/N 45001-UP (D31P-20)), designed for light to medium recovery tasks. Towing winch options generally provide capacities up to 40 kN (9,000 lbs), with hydraulic arrangement notes indicating front-mounted power take-off compatibility.
Drawbars/Counterweights
Drawbars for this model are engineered for low-profile towing, with counterweights available to balance rear-mounted ripper loads. Factory spec sheets specify counterweight masses ranging from 500 kg (1,102 lbs) to 1,000 kg (2,205 lbs), varying by configuration and series.
Cab/ROPS guarding options for forestry/waste configs
Forestry and waste configurations for the D31P-20 series include enhanced ROPS guarding, FOPS screens, and side protection kits. Factory documentation notes that cab guarding options vary by configuration and series, with specific kits available for root raking and debris handling.
Hydraulic arrangement notes for front/rear tools
The DWT037_1B_P1(S/N 45001-UP (D31P-20)) utilizes a closed-center hydraulic system with front and rear auxiliary circuits. Operation and maintenance manuals for this range specify hydraulic flow rates of 120 L/min (31.7 gpm) per circuit, with pressure settings varying by configuration and series.
All DWT037_1B_P1(S/N 45001-UP (D31P-20)) assemblies by section
Every catalogued assembly group for the Komatsu DWT037_1B_P1(S/N 45001-UP (D31P-20)). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Work Equipment
Komatsu : Dwt037_1b_p1(S/N 45001-Up (D31p-20)) : Work Equipment : Fair Lead (For Towing Winch)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 8 |
| 01***40 | Bolt,(With Center Guard) | 4 |
| 01***40 | Stud | 4 |
Komatsu : Dwt037_1b_p1(S/N 45001-Up (D31p-20)) : Work Equipment : Logging Arm (For Towing Winch)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 6 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 2 |
| 01***40 | Bolt,(With Center Guard) | 8 |
Komatsu : Dwt037_1b_p1(S/N 45001-Up (D31p-20)) : Work Equipment : Towing Winch (Bevel Gear? Drum And Wire Rope)
| 01***30 | Bolt,(Not Used With Emergency Str.) | 2 |
| 01***35 | Bolt, Bolt, Mount Tubes To Switch And Work Pumps | 12 |
| 01***35 | Bolt,R.H. Outside And L.H. Inside | 12 |
Komatsu : Dwt037_1b_p1(S/N 45001-Up (D31p-20)) : Work Equipment : Towing Winch (Bevel Pinion And Shift Fork)
| 01***30 | Bolt,(For Mechanical Governor) | 1 |
| 01***22 | Bolt | 8 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
Komatsu : Dwt037_1b_p1(S/N 45001-Up (D31p-20)) : Work Equipment : Towing Winch (Control Valve)
| 01***25 | Bolt,Without Revolution Sensor | 2 |
| 01***55 | Bolt,(10m) | 3 |
| 01***60 | Bolt,(For Japan And Sweden) | 3 |
Komatsu : Dwt037_1b_p1(S/N 45001-Up (D31p-20)) : Work Equipment : Towing Winch (Transmission Case)
| 01***25 | Bolt,Without Revolution Sensor | 3 |
| 01***35 | Bolt,(For Position Fixing) | 2 |
| 01***70 | Bolt (Op) | 4 |
Komatsu : Dwt037_1b_p1(S/N 45001-Up (D31p-20)) : Work Equipment : Towing Winch (Winch Case)
| 01***20 | Bolt,(With Auto Emergency Steering) | 4 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 30 |
| 01***40 | Bolt,(With Service Valve R.H.) | 2 |
Komatsu : Dwt037_1b_p1(S/N 45001-Up (D31p-20)) : Work Equipment : Towing Winch (Winch Pump)
| 01***55 | Bolt,(10m) | 5 |
| 01***70 | Bolt (Op) | 2 |
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 1 |
Komatsu : Dwt037_1b_p1(S/N 45001-Up (D31p-20)) : Work Equipment : Towing Winch (Winding Clutch 1/2)
| 01***30 | Bolt,(For Mechanical Governor) | 3 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***25 | Washer,Spring?For Additional Rear Lam | 3 |
Komatsu : Dwt037_1b_p1(S/N 45001-Up (D31p-20)) : Work Equipment : Towing Winch (Winding Clutch 2/2)
| 01***20 | Bolt,(With Auto Emergency Steering) | 6 |
| 01***35 | Bolt, Bolt, Mount Tubes To Switch And Work Pumps | 3 |
| 01***70 | Bolt | 1 |
Komatsu : Dwt037_1b_p1(S/N 45001-Up (D31p-20)) : Work Equipment : Towing Winch Control Lever
| 01***20 | Bolt,(With Auto Emergency Steering) | 4 |
| 01***25 | Bolt,Without Revolution Sensor | 2 |
| 01***30 | Bolt,(For Mechanical Governor) | 4 |
Komatsu : Dwt037_1b_p1(S/N 45001-Up (D31p-20)) : Work Equipment : Towing Winch Control Linkage
| 01***20 | Bolt,(With Auto Emergency Steering) | 2 |
| 01***30 | Bolt,(For Mechanical Governor) | 2 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 3 |
DWT037_1B_P1(S/N 45001-UP (D31P-20)) serial number reference
The Product Identification Number (PIN) plate on Komatsu bulldozers is typically located on the front frame casting, on the operator's left side near the radiator support. On larger models, it may also appear on the inside of the cab door pillar. The prefix is the first three letters of the 17-character ISO PIN stamped on the emissions/export plate, identifying the machine family and configuration.
| Prefix | Identifies | Notes |
|---|---|---|
| DWT | DWT037-1B-P1 | Serial range 45001-UP (D31P-20). Family: Crawler Dozer (D). Size class: 037. Generation: -1B. Configuration: P1. Engine: D31P-20. Source: published references catalog listing. |
Frequently asked questions
What engine does the DWT037-1B-P1 use?
The DWT037-1B-P1 (S/N 45001-UP) uses the D31P-20 engine configuration. Specific engine model details are not provided in the source text, but it is part of the D31 series family.
What is the operating weight of the DWT037-1B-P1?
The specific operating weight for the DWT037-1B-P1 is not documented in the provided sources. Operating weights for the broader Komatsu dozer class range from 13.8 to 112.62 tonnes, varying by configuration.
What model replaced the DWT037-1B-P1?
The source text does not explicitly state which model replaced the DWT037-1B-P1. It is part of the D31 series lineage, which includes variants like the D31Q, D31S, and D31E series.
What DWT037_1B_P1(S/N 45001-UP (D31P-20)) owners discuss
What are the typical powertrain and hydraulic behaviors for the Komatsu DWT037_1B_P1(S/N 45001-UP (D31P-20))?
What undercarriage wear patterns are common for this machine type?
What engine quirks are associated with the D31P-20 series?
What are common electrical and sensor issues?
What should be checked when buying a used DWT037_1B_P1(S/N 45001-UP (D31P-20))?
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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