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Komatsu D21 Crawler dozers tech specs

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Video[1]
Interior [2]
Exterior [4]
Attachments [2]
1972-1979
2 m Blade width
Hydrostatic Drive type
60.18 liter Fuel cap
3,430 kg Operating weight
1.68 m Track length
30.23 cm Track width

A compact crawler dozer designed for light construction, landscaping, and farm work, the Komatsu D21 combines a 3,430 kg operating weight with a 2 m blade and hydrostatic drive system for smooth control. Built for maneuverability and simple operation, the machine works well on small job sites where larger dozers are impractical.

Operating weight 3,430 kg

Blade width 2 m

Track width 30.23 cm

Track length 1.68 m

Fuel capacity 60.18 liters

Hydrostatic drive system

Compact crawler design for tight work areas

Makana rating

Owner rating

 | 3

Market average

AED 120,000

Starting from

AED 70,000

Komatsu D21 technical specifications

Highlight differences

Komatsu D21A-3

Komatsu D21A-5

Komatsu D21A-6

Komatsu D21A-7

Komatsu D21A-7E

Komatsu D21A-8

Komatsu D21A-8E0

Komatsu D21AG-6

Komatsu D21AG-7

Komatsu D21AG-7E

Komatsu D21P-3

Komatsu D21P-5

Komatsu D21P-8

Komatsu D21PG-6A

Komatsu D21PL-7

Komatsu D21PL-7E

General
Blade capacity 0.76 cu m
Blade capacity 0.76 cu m
Blade capacity -
Blade capacity -
Blade capacity -
Blade capacity -
Blade capacity -
Blade capacity -
Blade capacity -
Blade capacity -
Blade capacity 0.76 cu m
Blade capacity 0.92 cu m
Blade capacity 19.11 cu m
Blade capacity -
Blade capacity -
Blade capacity -
Displacement 2,605.55 cu cm
Displacement 2,941.48 cu cm
Displacement 2,690.76 cu cm
Displacement 2,690.76 cu cm
Displacement 2,775.97 cu cm
Displacement 3,048 cu cm
Displacement 3,048 cu cm
Displacement 2,690.76 cu cm
Displacement 2,690.76 cu cm
Displacement 2,775.97 cu cm
Displacement -
Displacement -
Displacement 3,048 cu cm
Displacement 2,690.76 cu cm
Displacement 2,690.76 cu cm
Displacement 2,775.97 cu cm
Drive type Hydrostatic
Drive type Hydrostatic
Drive type Hydrostatic
Drive type Hydrostatic
Drive type Hydrostatic
Drive type Komatsu HYDROSHIFT transmission
Drive type -
Drive type Hydrostatic
Drive type Hydrostatic
Drive type Hydrostatic
Drive type -
Drive type -
Drive type Komatsu HYDROSHIFT transmission
Drive type Hydrostatic
Drive type Hydrostatic
Drive type Hydrostatic
Engine model 4D92-1
Engine model 4D92-2P
Engine model 4D95S
Engine model 4D95S
Engine model 4D94E
Engine model 4D94LE-2
Engine model 4D94LE-2
Engine model 4D95S-W
Engine model 4D95S
Engine model 4D94E
Engine model -
Engine model -
Engine model 4D94LE-2
Engine model 4D95S-W
Engine model 4D95S
Engine model 4D94E
Max speed forward 6.92 kph
Max speed forward 4.51 kph
Max speed forward -
Max speed forward -
Max speed forward -
Max speed forward 4.35 kph
Max speed forward 4.35 kph
Max speed forward -
Max speed forward -
Max speed forward -
Max speed forward -
Max speed forward -
Max speed forward 4.35 kph
Max speed forward -
Max speed forward -
Max speed forward -
Operating weight 3,430 kg
Operating weight 3,620 kg
Operating weight 3,600 kg
Operating weight 3,600 kg
Operating weight 3,680 kg
Operating weight 3,941 kg
Operating weight 3,710 kg
Operating weight 3,640 kg
Operating weight 3,640 kg
Operating weight 3,720 kg
Operating weight 3,161 kg
Operating weight 3,279 kg
Operating weight 4,241 kg
Operating weight 4,030 kg
Operating weight 4,080 kg
Operating weight 4,110 kg
Years 1972-1979
Years 1972-1979
Years 1972-1979
Years 1972-1979
Years 1972-1979
Years 1972-1979
Years 1972-1979
Years 1972-1979
Years 1972-1979
Years 1972-1979
Years 1972-1979
Years 1972-1979
Years 1972-1979
Years 1972-1979
Years 1972-1979
Years 1972-1979
Market Average AED 120,000
Market Average AED 120,000
Market Average AED 120,000
Market Average AED 120,000
Market Average AED 120,000
Market Average AED 120,000
Market Average AED 120,000
Market Average AED 120,000
Market Average AED 120,000
Market Average AED 120,000
Market Average AED 120,000
Market Average AED 120,000
Market Average AED 120,000
Market Average AED 120,000
Market Average AED 120,000
Market Average AED 120,000
Price AED 70,000
Price AED 70,000
Price AED 70,000
Price AED 70,000
Price AED 70,000
Price AED 70,000
Price AED 70,000
Price AED 70,000
Price AED 70,000
Price AED 70,000
Price AED 70,000
Price AED 70,000
Price AED 70,000
Price AED 70,000
Price AED 70,000
Price AED 70,000
Dimensions
Blade height 0.57 m
Blade height 0.59 m
Blade height 0.59 m
Blade height 0.59 m
Blade height 0.59 m
Blade height 0.69 m
Blade height -
Blade height 0.59 m
Blade height 0.59 m
Blade height 0.59 m
Blade height 0.59 m
Blade height 0.57 m
Blade height 0.69 m
Blade height 0.59 m
Blade height 0.59 m
Blade height 0.59 m
Ground clearance 0.34 m
Ground clearance 0.34 m
Ground clearance 0.3 m
Ground clearance 0.3 m
Ground clearance 0.3 m
Ground clearance -
Ground clearance 0.37 m
Ground clearance 0.3 m
Ground clearance 0.3 m
Ground clearance 0.3 m
Ground clearance 0.4 m
Ground clearance 0.4 m
Ground clearance -
Ground clearance 0.37 m
Ground clearance 0.37 m
Ground clearance 0.37 m
Height - top of cab 2.1 m
Height - top of cab 2.16 m
Height - top of cab 2.5 m
Height - top of cab 2.5 m
Height - top of cab 2.5 m
Height - top of cab 2.47 m
Height - top of cab 1.8 m
Height - top of cab 2.5 m
Height - top of cab 2.5 m
Height - top of cab 2.47 m
Height - top of cab -
Height - top of cab 2.19 m
Height - top of cab 2.47 m
Height - top of cab 2.53 m
Height - top of cab 2.5 m
Height - top of cab 2.5 m
Length with blade 3.47 m
Length with blade 3.41 m
Length with blade 3.41 m
Length with blade 3.41 m
Length with blade 3.41 m
Length with blade 3.38 m
Length with blade 3.26 m
Length with blade 3.41 m
Length with blade 3.41 m
Length with blade 3.41 m
Length with blade -
Length with blade -
Length with blade 3.38 m
Length with blade 3.41 m
Length with blade 3.47 m
Length with blade 3.47 m
Length without blade 2.47 m
Length without blade 2.47 m
Length without blade 2.56 m
Length without blade 2.56 m
Length without blade 2.56 m
Length without blade -
Length without blade -
Length without blade 2.56 m
Length without blade 2.56 m
Length without blade -
Length without blade -
Length without blade 2.47 m
Length without blade -
Length without blade 2.56 m
Length without blade 2.65 m
Length without blade 2.65 m
Width over tracks 1.55 m
Width over tracks 1.62 m
Width over tracks 1.62 m
Width over tracks 1.62 m
Width over tracks 1.62 m
Width over tracks 1.34 m
Width over tracks -
Width over tracks 1.62 m
Width over tracks 1.62 m
Width over tracks 1.62 m
Width over tracks -
Width over tracks 1.83 m
Width over tracks 1.52 m
Width over tracks 2.01 m
Width over tracks 2.19 m
Width over tracks 2.19 m
Operational specifications
Blade width 2 m
Blade width 2 m
Blade width 2 m
Blade width 2 m
Blade width 2 m
Blade width 2 m
Blade width -
Blade width 2 m
Blade width 2 m
Blade width 2 m
Blade width 2 m
Blade width 2 m
Blade width 2 m
Blade width 2 m
Blade width 2 m
Blade width 2 m
Service refill capacities
Cooling fluid cap 14 liter
Cooling fluid cap 13.25 liter
Cooling fluid cap -
Cooling fluid cap -
Cooling fluid cap -
Cooling fluid cap 9.84 liter
Cooling fluid cap 10.22 liter
Cooling fluid cap -
Cooling fluid cap -
Cooling fluid cap -
Cooling fluid cap -
Cooling fluid cap -
Cooling fluid cap 9.84 liter
Cooling fluid cap -
Cooling fluid cap -
Cooling fluid cap -
Fuel cap 60.18 liter
Fuel cap 60.18 liter
Fuel cap -
Fuel cap -
Fuel cap -
Fuel cap 60.18 liter
Fuel cap 60.18 liter
Fuel cap -
Fuel cap -
Fuel cap -
Fuel cap -
Fuel cap -
Fuel cap 60.18 liter
Fuel cap -
Fuel cap -
Fuel cap -
Hydraulic fluid cap -
Hydraulic fluid cap -
Hydraulic fluid cap -
Hydraulic fluid cap -
Hydraulic fluid cap -
Hydraulic fluid cap 20.82 liter
Hydraulic fluid cap 21.2 liter
Hydraulic fluid cap -
Hydraulic fluid cap -
Hydraulic fluid cap -
Hydraulic fluid cap -
Hydraulic fluid cap -
Hydraulic fluid cap 20.82 liter
Hydraulic fluid cap -
Hydraulic fluid cap -
Hydraulic fluid cap -
Engine
Gross power 27.59 kw
Gross power 29.08 kw
Gross power 29.83 kw
Gross power 29.83 kw
Gross power 29.83 kw
Gross power 32.14 kw
Gross power 32.29 kw
Gross power 29.83 kw
Gross power 29.83 kw
Gross power 29.83 kw
Gross power 27.59 kw
Gross power 29.08 kw
Gross power 32.14 kw
Gross power 29.83 kw
Gross power 29.83 kw
Gross power 29.83 kw
Number of cylinders 4
Number of cylinders 4
Number of cylinders 4
Number of cylinders 4
Number of cylinders 4
Number of cylinders 4
Number of cylinders 4
Number of cylinders 4
Number of cylinders 4
Number of cylinders 4
Number of cylinders -
Number of cylinders -
Number of cylinders 4
Number of cylinders -
Number of cylinders 4
Number of cylinders -
Power measured @ 2,450 rpm
Power measured @ 2,450 rpm
Power measured @ 2,450 rpm
Power measured @ 2,450 rpm
Power measured @ 2,450 rpm
Power measured @ -
Power measured @ 2,450 rpm
Power measured @ 2,450 rpm
Power measured @ 2,450 rpm
Power measured @ 2,450 rpm
Power measured @ -
Power measured @ -
Power measured @ -
Power measured @ 2,450 rpm
Power measured @ 2,450 rpm
Power measured @ 2,450 rpm
Max torque -
Max torque 147.1 Nm
Max torque -
Max torque -
Max torque -
Max torque -
Max torque 174.08 Nm
Max torque -
Max torque -
Max torque -
Max torque -
Max torque -
Max torque -
Max torque -
Max torque -
Max torque -
Aspiration -
Aspiration -
Aspiration -
Aspiration -
Aspiration -
Aspiration Naturally aspirated
Aspiration -
Aspiration -
Aspiration -
Aspiration -
Aspiration -
Aspiration -
Aspiration Naturally aspirated
Aspiration -
Aspiration -
Aspiration -
Net power -
Net power -
Net power -
Net power -
Net power -
Net power 29.83 kw
Net power -
Net power -
Net power -
Net power -
Net power -
Net power -
Net power 29.83 kw
Net power -
Net power -
Net power -
Torque measured @ -
Torque measured @ -
Torque measured @ -
Torque measured @ -
Torque measured @ -
Torque measured @ -
Torque measured @ 1,300 rpm
Torque measured @ -
Torque measured @ -
Torque measured @ -
Torque measured @ -
Torque measured @ -
Torque measured @ -
Torque measured @ -
Torque measured @ -
Torque measured @ -
Undercarriage
Ground pressure 0.29 bar
Ground pressure 0.3 bar
Ground pressure -
Ground pressure -
Ground pressure -
Ground pressure 0.33 bar
Ground pressure 0.31 bar
Ground pressure -
Ground pressure -
Ground pressure -
Ground pressure 0.19 bar
Ground pressure 0.19 bar
Ground pressure 0.21 bar
Ground pressure -
Ground pressure -
Ground pressure -
Number of shoes per side 37
Number of shoes per side 37
Number of shoes per side 37
Number of shoes per side -
Number of shoes per side -
Number of shoes per side 37
Number of shoes per side 37
Number of shoes per side -
Number of shoes per side -
Number of shoes per side -
Number of shoes per side -
Number of shoes per side -
Number of shoes per side 37
Number of shoes per side 67
Number of shoes per side -
Number of shoes per side -
Number of track rollers per side 5
Number of track rollers per side 5
Number of track rollers per side 5
Number of track rollers per side 5
Number of track rollers per side 5
Number of track rollers per side 5
Number of track rollers per side 5
Number of track rollers per side 5
Number of track rollers per side 5
Number of track rollers per side 5
Number of track rollers per side 5
Number of track rollers per side 5
Number of track rollers per side 5
Number of track rollers per side 5
Number of track rollers per side 6
Number of track rollers per side 6
Track gauge 1.22 m
Track gauge 1.31 m
Track gauge 1.31 m
Track gauge 1.31 m
Track gauge 1.31 m
Track gauge -
Track gauge -
Track gauge 1.31 m
Track gauge 1.31 m
Track gauge 1.31 m
Track gauge 1.34 m
Track gauge 1.31 m
Track gauge -
Track gauge 1.49 m
Track gauge 1.49 m
Track gauge 1.49 m
Track length 1.68 m
Track length 1.71 m
Track length 1.71 m
Track length 1.71 m
Track length 1.71 m
Track length -
Track length -
Track length 1.71 m
Track length 1.71 m
Track length 1.71 m
Track length 1.68 m
Track length 1.71 m
Track length -
Track length 1.71 m
Track length 1.83 m
Track length 1.83 m
Track pitch 13.72 cm
Track pitch 13.72 cm
Track pitch 13.72 cm
Track pitch 13.72 cm
Track pitch 13.72 cm
Track pitch -
Track pitch -
Track pitch 14.73 cm
Track pitch 14.73 cm
Track pitch 7.11 cm
Track pitch -
Track pitch -
Track pitch -
Track pitch 14.73 cm
Track pitch 13.72 cm
Track pitch 13.72 cm
Track width 30.23 cm
Track width 30.23 cm
Track width 30.23 cm
Track width 30.23 cm
Track width 30.23 cm
Track width 29.97 cm
Track width 30.23 cm
Track width 30.23 cm
Track width 30.23 cm
Track width 30.23 cm
Track width 51.05 cm
Track width 51.05 cm
Track width 50.8 cm
Track width 50.04 cm
Track width 70.1 cm
Track width 70.1 cm
Ground contact area -
Ground contact area -
Ground contact area -
Ground contact area -
Ground contact area -
Ground contact area 25,727.75 cu cm
Ground contact area 25,727.75 cu cm
Ground contact area -
Ground contact area -
Ground contact area -
Ground contact area -
Ground contact area -
Ground contact area 43,655.23 cu cm
Ground contact area -
Ground contact area -
Ground contact area -
Transmission
Max speed reverse 6.44 kph
Max speed reverse 5.47 kph
Max speed reverse -
Max speed reverse -
Max speed reverse -
Max speed reverse 5.63 kph
Max speed reverse 5.63 kph
Max speed reverse -
Max speed reverse -
Max speed reverse -
Max speed reverse -
Max speed reverse -
Max speed reverse 5.63 kph
Max speed reverse -
Max speed reverse -
Max speed reverse -
Number of forward gears 3
Number of forward gears 2
Number of forward gears 2
Number of forward gears 2
Number of forward gears 2
Number of forward gears 2
Number of forward gears 2
Number of forward gears 2
Number of forward gears 2
Number of forward gears 2
Number of forward gears -
Number of forward gears -
Number of forward gears 2
Number of forward gears 2
Number of forward gears 2
Number of forward gears 2
Number of reverse gears 3
Number of reverse gears 2
Number of reverse gears 2
Number of reverse gears 2
Number of reverse gears 2
Number of reverse gears 2
Number of reverse gears 2
Number of reverse gears 2
Number of reverse gears 2
Number of reverse gears 2
Number of reverse gears -
Number of reverse gears -
Number of reverse gears 2
Number of reverse gears 2
Number of reverse gears 2
Number of reverse gears 2
Hydraulic system
Pump flow cap -
Pump flow cap 53.37 lpm
Pump flow cap -
Pump flow cap -
Pump flow cap -
Pump flow cap -
Pump flow cap -
Pump flow cap -
Pump flow cap -
Pump flow cap -
Pump flow cap -
Pump flow cap -
Pump flow cap -
Pump flow cap -
Pump flow cap -
Pump flow cap -
Relief valve pressure -
Relief valve pressure 152.01 bar
Relief valve pressure -
Relief valve pressure -
Relief valve pressure -
Relief valve pressure -
Relief valve pressure -
Relief valve pressure -
Relief valve pressure -
Relief valve pressure -
Relief valve pressure -
Relief valve pressure -
Relief valve pressure -
Relief valve pressure -
Relief valve pressure -
Relief valve pressure -
Blades
Blade angle -
Blade angle -
Blade angle -
Blade angle -
Blade angle -
Blade angle 25 º
Blade angle -
Blade angle -
Blade angle -
Blade angle -
Blade angle -
Blade angle -
Blade angle 25 º
Blade angle -
Blade angle -
Blade angle -
Refill capacities
Engine oil cap -
Engine oil cap -
Engine oil cap -
Engine oil cap -
Engine oil cap -
Engine oil cap 6.43 liter
Engine oil cap 6.81 liter
Engine oil cap -
Engine oil cap -
Engine oil cap -
Engine oil cap -
Engine oil cap -
Engine oil cap 6.43 liter
Engine oil cap -
Engine oil cap -
Engine oil cap -
Final drives fluid cap -
Final drives fluid cap -
Final drives fluid cap -
Final drives fluid cap -
Final drives fluid cap -
Final drives fluid cap 6.06 liter
Final drives fluid cap 6.06 liter
Final drives fluid cap -
Final drives fluid cap -
Final drives fluid cap -
Final drives fluid cap -
Final drives fluid cap -
Final drives fluid cap 7.95 liter
Final drives fluid cap -
Final drives fluid cap -
Final drives fluid cap -
Download datasheets
OEM product brochure

Komatsu D21 expert review

Reviewed by Wade A. on March 12, 2026

Overview

The Komatsu D21 is a compact crawler dozer designed for landscaping, farm work, and light construction. With a 3,430 kg operating weight and a 2 m blade, it is suited for small-scale earthmoving tasks.

Expert rating: 3 stars

Pros Hydrostatic drive provides smooth control and easy maneuverability.
Cons Limited pushing capability compared with larger crawler dozers.

Performance & Efficiency

The hydrostatic drivetrain allows precise control during grading and landscaping work, while the compact crawler layout ensures traction on soft soil.

In Comparison

Komatsu D20: Smaller dozer designed for similar light-duty work.
Komatsu D31: Larger dozer capable of heavier earthmoving tasks.
Komatsu D21: Balanced compact machine with improved maneuverability.

Final Verdict

Rated 3 stars, the Komatsu D21 remains a practical compact crawler dozer within the AED 70,000–120,000 range.

Show less

Komatsu D21 owner rating

Komatsu D21 Crawler dozers [1972-1979]

1972-1979

Overall rating

Based on 3 ratings

4.3
performance

4.3

comfort

4.3

fuel efficiency

4.3

safety

4.3

features

4.3

5 stars

33 %

4 stars

67 %

3 stars

0 %

2 stars

0 %

1 stars

0 %

Pros
Hydrostatic drive makes grading and small earthmoving tasks easier to control.
Cons
Blade size limits productivity on larger earthmoving jobs.
performance

4.0

comfort

5.0

fuel efficiency

4.0

safety

5.0

features

4.0

Valuation

Last 12 month
1972

Komatsu D21 similar models

Highlight differences
Komatsu D21A-3
Komatsu D20A-3
Komatsu D31A-16
General
Blade capacity 0.76 cu m
Blade capacity 0.76 cu m
Blade capacity -
Displacement 2,605.55 cu cm
Displacement 2,600.63 cu cm
Displacement 4,326.19 cu cm
Drive type Hydrostatic
Drive type Direct drive
Drive type planetary gear
Engine model 4D92-1
Engine model 4D95-1A
Engine model 4D105-3
Max speed forward 6.92 kph
Max speed forward 7.4 kph
Max speed forward 6.6 kph
Operating weight 3,430 kg
Operating weight 3,330 kg
Operating weight 5,180 kg
Years 1972-1979
Years 1993-1996
Years 1993-1996
Market Average AED 120,000
Market Average AED 100,000
Market Average AED 210,000
Price AED 70,000
Price AED 60,000
Price AED 120,000
Dimensions
Blade height 0.57 m
Blade height 0.57 m
Blade height 0.75 m
Ground clearance 0.34 m
Ground clearance 0.34 m
Ground clearance -
Height - top of cab 2.1 m
Height - top of cab 2.1 m
Height - top of cab -
Length with blade 3.47 m
Length with blade 3.47 m
Length with blade -
Length without blade 2.47 m
Length without blade 2.47 m
Length without blade 2.87 m
Width over tracks 1.55 m
Width over tracks 1.55 m
Width over tracks 1.8 m
Operational specifications
Blade width 2 m
Blade width 2 m
Blade width 2 m
Service refill capacities
Cooling fluid cap 14 liter
Cooling fluid cap 14 liter
Cooling fluid cap 22.33 liter
Fuel cap 60.18 liter
Fuel cap 60.18 liter
Fuel cap 115.06 liter
Engine
Gross power 27.59 kw
Gross power 26.1 kw
Gross power 46.98 kw
Number of cylinders 4
Number of cylinders 4
Number of cylinders -
Power measured @ 2,450 rpm
Power measured @ 2,450 rpm
Power measured @ -
Undercarriage
Ground pressure 0.29 bar
Ground pressure 0.28 bar
Ground pressure 0.41 bar
Number of shoes per side 37
Number of shoes per side 37
Number of shoes per side -
Number of track rollers per side 5
Number of track rollers per side 5
Number of track rollers per side 5
Track gauge 1.22 m
Track gauge 1.22 m
Track gauge 1.46 m
Track length 1.68 m
Track length 1.68 m
Track length 1.89 m
Track pitch 13.72 cm
Track pitch 13.72 cm
Track pitch -
Track width 30.23 cm
Track width 30.23 cm
Track width 33.02 cm
Transmission
Max speed reverse 6.44 kph
Max speed reverse 6.6 kph
Max speed reverse 7.24 kph
Number of forward gears 3
Number of forward gears 3
Number of forward gears 3
Number of reverse gears 3
Number of reverse gears 2
Number of reverse gears 3

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build datetime: 4/20/2026, 11:45:24 AM