Komatsu D21A-8 vs. Cat D9R Crawler dozers Comparison
Compare available technical data for Bulldozers. Find the right details to make your decision easier.
Comparison
Highlight differences
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Aspiration
Aspiration Naturally aspirated
Aspiration -
Gross power
Gross power 32.14 kw
Gross power -
Net power
Net power 29.83 kw
Net power -
Number of cylinders
Number of cylinders 4
Number of cylinders 8
Power measured @
Power measured @ -
Power measured @ 1,900 rpm
Years
Years 1972-1979
Years 2021-2025
Market Average
Market Average AED 120,000
Market Average AED 2,200,000
Price
Price AED 70,000
Price AED 2,000,000
Blade angle
Blade angle 25 ยบ
Blade angle -
Blade height
Blade height 0.69 m
Blade height -
Height - top of cab
Height - top of cab 2.47 m
Height - top of cab -
Length with blade
Length with blade 3.38 m
Length with blade -
Width over tracks
Width over tracks 1.34 m
Width over tracks 2.96 m
Ground clearance
Ground clearance -
Ground clearance 0.61 m
Blade width
Blade width 2.16 m
Blade width -
Displacement
Displacement 3,048 cu cm
Displacement 18,001.23 cm3
Drive type
Drive type Komatsu HYDROSHIFT transmission
Drive type Powershift
Engine model
Engine model 4D94LE-2
Engine model C18
Max speed forward
Max speed forward 4.35 kph
Max speed forward 11.91 kph
Operating weight
Operating weight 3,941 kg
Operating weight 50,000 kg
Blade capacity
Blade capacity -
Blade capacity 13.5 cu m
Operating voltage
Operating voltage -
Operating voltage 24 V
Cooling fluid cap
Cooling fluid cap 9.84 liter
Cooling fluid cap -
Fuel cap
Fuel cap 60.18 liter
Fuel cap 817.56 liter
Hydraulic fluid cap
Hydraulic fluid cap 20.82 liter
Hydraulic fluid cap 71.92 liter
Engine oil cap
Engine oil cap 6.43 liter
Engine oil cap 45.42 liter
Final drives fluid cap
Final drives fluid cap 6.06 liter
Final drives fluid cap 18.93 liters
Ground contact area
Ground contact area 25,727.75 cu cm
Ground contact area -
Ground pressure
Ground pressure 0.33 bar
Ground pressure 1.11 bar
Number of shoes per side
Number of shoes per side 37
Number of shoes per side -
Number of track rollers per side
Number of track rollers per side 5
Number of track rollers per side 8
Track width
Track width 29.97 cm
Track width 61.21 mm
Track gauge
Track gauge -
Track gauge 2.26 m
Max speed reverse
Max speed reverse 5.63 kph
Max speed reverse 14.64 kph
Number of forward gears
Number of forward gears 2
Number of forward gears 3
Number of reverse gears
Number of reverse gears 2
Number of reverse gears 3
Performance
Looking at performance technical specs and key features the Komatsu D21A-8 Crawler dozers excels in terms of engine power at and operating weight compared to other models like the Cat D9R Crawler dozers.
User rating
Owners operators and fleet managers recommend the Komatsu D21A-8 Crawler dozers for its high reliability and endurance in diverse applications. The same can be said about the Cat D9R Crawler dozers.
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Featured technical specs & reviews. Valuable insights.
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