Komatsu DWT037_1B_E1(S/N 42001-UP (D31E-20))
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu DWT037-1B-E1 (S/N 42001-UP, D31E-20) is a small crawler bulldozer designed for light construction and site development. It belongs to the D31 series lineage, succeeding earlier D31A and D31P variants. Operating weights vary by configuration, typically ranging from 13,800 to 15,500 lbs (6,260 to 7,030 kg). The machine is equipped with a Komatsu S4D102E-1 engine, delivering approximately 81 hp (60 kW). Configurations include standard and low-ground-pressure (LGP) tracks, with options for various blade and ripper attachments.
Across the D31 series generations, changes focused on emissions compliance and undercarriage durability. The D31E-20 variant represents the Tier 4 Interim/Stage IIIA emissions package, integrating a Diesel Particulate Filter (KDPF) and Selective Catalytic Reduction (SCR) system compared to the pre-emissions D31A/AM models. This machine remains relevant in the used market due to its compact size, ease of maintenance, and widespread availability of aftermarket undercarriage parts. The D31E-20 is succeeded by the D31P-20A series, which further refined emissions controls and operator comfort.
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_E1(S/N 42001-UP (D31E-20)) specifications
Engine
| Model | D31E-20 |
| 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 |
| Track Shoe Width | 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
| Standard Blade Capacity | varies by configuration/series |
| SU Blade Capacity | varies by configuration/series |
| Angle Blade Capacity | varies by configuration/series |
| 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 DWT037_1B_E1(S/N 42001-UP (D31E-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_E1(S/N 42001-UP (D31E-20)) beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize Komatsu Oil Wear Analysis (KOWA) at every 500-hour interval to monitor engine wear metals and hydraulic contamination. Check coolant SCA levels at 500 hours to prevent liner cavitation in the S4D102E-1 engine. Monitor KDPF differential pressure and SCR DEF levels via KOMTRAX telematics to predict regeneration needs and avoid exhaust system damage. Track undercarriage wear measurements at 500 hours to forecast track and sprocket replacement timing.
Corrective & Common Repairs
Address frequent S4D102E-1 engine issues by inspecting fuel injectors and turbocharger hoses for leaks. Replace hydraulic return filters at 500 hours to prevent valve spool wear in the main control valve. Check final drive oil for water ingress and metal shavings at 1,000 hours. Inspect track tension and idler seals regularly to prevent premature undercarriage failure. Replace worn cutting edges and end bits to maintain blade efficiency and reduce chassis stress.
Overhaul & Rebuild Points
Plan engine overhaul around 10,000-12,000 hours based on compression testing and oil consumption trends. Inspect transmission clutch packs and torque converter at 10,000 hours for slippage or overheating signs. Rebuild final drives if oil analysis shows high gear wear metals or if noise indicates bearing failure. Check swing circle and pivot points for wear on attached implements. Evaluate hydraulic pump swash plates and cylinder seals for pressure loss during major service intervals.
Seasonal & Environment Servicing
In cold climates, use Komatsu Super Coolant AF-NAC and ensure DEF fluid is stored above freezing. Check battery electrolyte levels and charge state frequently in low temperatures. In dusty environments, clean air filter outer element more often and check restriction indicator daily. In wet conditions, inspect track adjusters and idler seals for mud packing and corrosion. Flush cooling system annually to prevent scale buildup in the radiator and oil cooler cores.
DWT037_1B_E1(S/N 42001-UP (D31E-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_E1(S/N 42001-UP (D31E-20)) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| E10 | Engine controller power failure or engine control drive system circuit malfunction. | Faulty ECM power connections, blown fuses, or damaged ground wires. | Inspect ECM power connections, fuses, and ground wires. |
| CA115 | Engine crankshaft speed sensor and backup speed sensor failure. | Broken sensor, wiring issue, or connector corrosion. | Replace the speed sensor and verify voltage at the pin connector. |
| CA441 | Battery voltage too low. | Weak battery, failing alternator, or loose connections. | Replace the battery or alternator and check the voltage regulator. |
| CA442 | Battery voltage too high. | Failing voltage regulator or alternator overcharging. | Replace the alternator or battery and check the voltage regulator. |
| AA10NX | Air cleaner clogging. | Dirty or blocked air filter element. | Replace the air filter element. |
| CA122 | Intake air pressure sensor feedback voltage too high. | Faulty intake pressure sensor or wiring short. | Verify the intake pressure sensor operation and inspect wiring. |
| CA123 | Intake air pressure sensor feedback voltage too low. | Sensor short circuit or severe airflow restriction. | Check for a sensor short or an airflow restriction. |
| CA144 | Coolant temperature sensor feedback voltage too high. | Faulty coolant temperature sensor or open circuit. | Replace the coolant temperature sensor. |
| CA145 | Coolant temperature sensor feedback voltage too low. | Faulty coolant temperature sensor or short circuit. | Replace the coolant temperature sensor. |
| CA451 | Common rail pressure sensor feedback value too high. | Malfunctioning rail pressure sensor or actual overpressure condition. | Diagnose the fuel rail pressure sensor or check pump lines. |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
DWT037_1B_E1(S/N 42001-UP (D31E-20)) attachments & work tools
Blades
The DWT037_1B_E1 (S/N 42001-UP, D31E-20) is classified as a 'Bulldozer - Small' and is compatible with standard, semi-universal, and angle blade configurations. VPAT (Variable Position Angle Tilt) blade availability is not documented for this specific serial range in the provided sources. Typical widths and capacities for this class vary by configuration and series.
Rippers
Multi-shank and single-shank ripper options are available for the D31 class bulldozers, with specific MS ripper listings confirming compatibility with Komatsu D31 models. Weights for these ripper attachments are not specified in the provided documentation.
Winches
Towing winch options are listed as a standard attachment category for Komatsu bulldozers in the provided equipment guides. Specific class ratings or capacities for the DWT037_1B_E1 are not detailed in the available text.
Drawbars/Counterweights
Drawbars and counterweights are included in the general list of Komatsu bulldozer attachments. Specific weights or compatibility details for the DWT037_1B_E1 are not provided in the source material.
Cab/ROPS Guarding
Forestry and waste configuration guarding options are not explicitly detailed for the DWT037_1B_E1 in the provided sources. The DWT037_1B-E7 (S/N 3001-UP) parts manual lists 'GUARD' as a component section, but specific forestry ROPS configurations for the E1 series are not documented.
Hydraulic Arrangement
The DWT037_1B_E1 utilizes a hydraulic system for front and rear tool operation, as indicated by the 'HYDRAULIC SYSTEM' section in the related DWT037 parts manual. Specific arrangement notes for front/rear tool connectivity are not provided in the source text.
All DWT037_1B_E1(S/N 42001-UP (D31E-20)) assemblies by section
Every catalogued assembly group for the Komatsu DWT037_1B_E1(S/N 42001-UP (D31E-20)). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Work Equipment
Komatsu : Dwt037_1b_e1(S/N 42001-Up (D31e-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_e1(S/N 42001-Up (D31e-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_e1(S/N 42001-Up (D31e-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_e1(S/N 42001-Up (D31e-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_e1(S/N 42001-Up (D31e-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_e1(S/N 42001-Up (D31e-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_e1(S/N 42001-Up (D31e-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_e1(S/N 42001-Up (D31e-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_e1(S/N 42001-Up (D31e-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_e1(S/N 42001-Up (D31e-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_e1(S/N 42001-Up (D31e-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_e1(S/N 42001-Up (D31e-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 |
Frequently asked questions
What engine does the DWT037-1B-E1 use?
The DWT037-1B-E1 (S/N 42001-UP, D31E-20) is powered by a Komatsu S4D102E-1 diesel engine, delivering approximately 81 hp (60 kW).
What is the operating weight of the DWT037-1B-E1?
Operating weight varies by configuration and attachment package, typically ranging from 13,800 to 15,500 lbs (6,260 to 7,030 kg).
What model replaced the DWT037-1B-E1?
The DWT037-1B-E1 was succeeded by the DWT037-1B-P1 (S/N 45001-UP, D31P-20A) series, which features updated emissions controls and improved operator comfort.
What DWT037_1B_E1(S/N 42001-UP (D31E-20)) owners discuss
What are the typical powertrain and hydraulic behaviors for the Komatsu DWT037_1B_E1(S/N 42001-UP (D31E-20)) bulldozer?
What undercarriage and wear patterns are typical for this machine type?
What are the engine quirks per series for the Komatsu DWT037_1B_E1(S/N 42001-UP (D31E-20))?
What are common electrical and sensor issues for this machine?
What should be checked when buying a used Komatsu DWT037_1B_E1(S/N 42001-UP (D31E-20))?
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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