Komatsu D21A-8 vs. Cat D3B Crawler dozers Comparison

Compare available technical data for Bulldozers. Find the right details to make your decision easier.

Comparison

Highlight differences

Komatsu D21 Crawler dozers

Cat D3 Crawler dozers

Engine

Aspiration

Aspiration Naturally aspirated

Gross power

Gross power 32.14 kw

Gross power -

Net power

Net power 29.83 kw

Net power 48.47 kw

Number of cylinders

Number of cylinders 4

Alternator supplied amperage

Alternator supplied amperage -

Alternator supplied amperage 40 Amh

Power measured @

Power measured @ -

Power measured @ 2,400 rpm

Years

Years 1972-1979

Years 1972-2020

Market Average

Market Average AED 120,000

Market Average AED 200,000

Price

Price AED 70,000

Price AED 120,000

Blades

Blade angle

Blade angle 25 º

Dimensions

Blade height

Blade height 0.69 m

Blade height 0.84 m

Height - top of cab

Height - top of cab 2.47 m

Height - top of cab 2.68 m

Length with blade

Length with blade 3.38 m

Length with blade 3.69 m

Width over tracks

Width over tracks 1.34 m

Width over tracks 1.8 m

Ground clearance

Ground clearance -

Ground clearance 0.34 m

Length without blade

Length without blade -

Length without blade 2.77 m

General

Blade width

Blade width 2.16 m

Blade width 2.44 m

Displacement

Displacement 3,048 cu cm

Displacement 5,201.27 cu cm

Drive type

Drive type Komatsu HYDROSHIFT transmission

Drive type Planetary powershift

Engine model

Engine model 4D94LE-2

Engine model 3204

Max speed forward

Max speed forward 4.35 kph

Max speed forward 10.62 kph

Operating weight

Operating weight 3,941 kg

Operating weight 6,877 kg

Blade capacity

Blade capacity -

Blade capacity 1.3 cu m

Operating voltage

Operating voltage -

Operating voltage 12 V

Service refill capacities

Cooling fluid cap

Cooling fluid cap 9.84 liter

Cooling fluid cap 20.06 liter

Fuel cap

Fuel cap 60.18 liter

Fuel cap 114.31 liter

Hydraulic fluid cap

Hydraulic fluid cap 20.82 liter

Hydraulic fluid cap 70.02 liter

Refill capacities

Engine oil cap

Engine oil cap 6.43 liter

Engine oil cap 12.11 liter

Final drives fluid cap

Final drives fluid cap 6.06 liter

Final drives fluid cap 8.33 liter

Undercarriage

Ground contact area

Ground contact area 25,727.75 cu cm

Ground contact area 28,195.64 cu cm

Ground pressure

Ground pressure 0.33 bar

Ground pressure -

Number of shoes per side

Number of shoes per side 37

Number of shoes per side 36

Number of track rollers per side

Number of track rollers per side 5

Track width

Track width 29.97 cm

Track width 30.48 cm

Track gauge

Track gauge -

Track gauge 1.43 m

Track length

Track length -

Track length 1.83 m

Transmission

Max speed reverse

Max speed reverse 5.63 kph

Max speed reverse 11.43 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

Hydraulic system

Pump flow cap

Pump flow cap -

Pump flow cap 55.26 lpm

Relief valve pressure

Relief valve pressure -

Relief valve pressure 172.37 bar

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 D3B 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 D3B Crawler dozers.