Crawler Dozers · Make & Model reference
Komatsu D31EX-21
The -21 series is a well-regarded small dozer. Regular hydraulic fluid changes are crucial for hydrostatic longevity.
Operating weight
17,100 lbs
Horsepower
78 hp
Fuel burn
1.5 - 2.2 gph
Years produced
2005 - 2011
AI-updated · Last refresh 7/19/2026
Full specifications
Blade capacity2.2 cu yd
Ground pressure5.2 psi
Max drawbar pull24,400 lbs
TransmissionHydrostatic
Shipping dimensions
Length16 ft 5 in
Width7 ft
Height8 ft 7 in
Weight17,100 lbs
Use these for permit routing and lowboy selection.
Recent auction history
| Year range | Hours | Avg | Low | High |
|---|---|---|---|---|
| 2018-2022 | 5,000-8,000 | $60,000 | $45,000 | $75,000 |
| 2013-2017 | 8,000-11,000 | $40,000 | $30,000 | $55,000 |
AI price estimate
Good, avg hours
2010 model year
$70,000
Fair, high hours
2007 model year
$50,000
Poor, very high hours
2005 model year
$30,000
Common problems to check
- Hydrostatic system overheating (requires maintenance)
- Electrical sensor failures
- Undercarriage roller seals
- Engine fan belt issues
Why buyers pick it
- Compact size for confined areas
- Hydrostatic drive for precise control
- Good fuel economy
- Reliable engine
Best jobs for this machine
Small to medium residential sitesGolf course maintenanceTrench backfilling
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