Is a Komatsu D41P-6DB31T with Serial SDB53009 a Legitimate 2006 Model

[MikePhua]

The Komatsu D41P Series and Its Production History
The Komatsu D41P-6 is part of Komatsu’s mid-size dozer lineup, designed for grading, site preparation, and light earthmoving. Komatsu Ltd., founded in Japan in 1921, has grown into one of the world’s largest construction equipment manufacturers. The D41 series was introduced to fill the gap between compact dozers and large crawler tractors, offering a balance of power, maneuverability, and visibility.
The D41P-6 variant was produced primarily between 1996 and 2005, with some units continuing into early 2006 depending on regional distribution and inventory cycles. The “P” designation refers to the swamp track configuration—wider track shoes and lower ground pressure for soft terrain. These machines were especially popular in forestry, wetland reclamation, and southern U.S. construction zones.
Decoding the Serial Number and Model Designation
The serial number SDB53009 corresponds to a unit within the D41P-6DB31T subseries. Komatsu serial numbers typically begin with a prefix indicating the model and configuration, followed by a production sequence number. In this case:
- D41P-6: Model designation, sixth-generation - DB31T: Sub-variant code, often indicating transmission type, cab configuration, or emission compliance - SDB53009: Serial number, suggesting mid-to-late production within the -6 series
While the machine is claimed to be a 2006 model, the -6 series officially ended production around 2005. However, it’s common for equipment to be manufactured in late 2005 and sold or registered in 2006. This overlap is not unusual in the industry and does not necessarily indicate a grey market unit.
Grey Market Concerns and Identification Practices
Grey market machines are units imported outside official dealer channels, often from Japan or other regions with different safety and emissions standards. These machines may lack English-language decals, operator manuals, or EPA certification. To verify legitimacy:

• Locate the 17-digit PIN (Product Identification Number) plate, typically on the frame near the engine compartment
  
• Contact a Komatsu dealer with the full serial number and PIN for verification
  
• Check for EPA compliance stickers and operator warnings in English
  
• Confirm that the machine’s electrical system and hydraulic fittings match North American standards
  

If the machine has a clean VIN and matches Komatsu’s official production records, it is likely a legitimate unit—even if sold in 2006.
Mechanical Condition and Field Observations
The unit in question reportedly has:

• Cab with air conditioning
  
• Approximately 60% undercarriage life remaining
  
• Smooth transmission shifting
  
• Strong hydraulic response
  
• Clean engine operation
  

These indicators suggest the machine has been reasonably maintained. Cab air systems were optional on many D41P-6 units, and their presence often reflects a higher-spec build. A 60% undercarriage is acceptable for resale, though buyers should inspect sprockets, rollers, and track tension closely.
Swamp Track Performance and Use Cases
The “P” configuration excels in soft ground conditions due to its wide track shoes and low ground pressure. These machines are often deployed in:

• Peat bog excavation
  
• Marshland grading
  
• Pipeline right-of-way clearing
  
• Southern U.S. clay and loam soils
  

Operators report that the D41P-6 performs well in dry conditions with minimal ground slip, though it may struggle on steep inclines due to reduced traction from the wide shoes.
Recommendations for Buyers and Inspectors
Before purchasing a Komatsu D41P-6:

• Verify serial number and PIN with a Komatsu dealer
  
• Inspect undercarriage wear and track alignment
  
• Test hydraulic responsiveness and blade control
  
• Check cab electronics and HVAC function
  
• Review maintenance records and oil sample history
  

If the machine has been repainted, ensure the cosmetic work hasn’t concealed structural repairs or corrosion. A clean paint job can mask thousands in hidden damage, especially on swamp-track machines exposed to moisture.
Conclusion
The Komatsu D41P-6DB31T with serial SDB53009 is likely a late-production unit from the final year of the -6 series. While the 2006 designation may raise questions, it aligns with known production timelines and does not inherently suggest grey market origin. With proper verification and inspection, this dozer can be a reliable addition to a fleet—especially for soft ground applications where traction and flotation matter more than brute force. In the world of used equipment, the serial number tells a story—but the machine’s condition writes the final chapter.