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Komatsu D21Q Crawler loaders tech specs

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Video[1]
Generation-Komatsu D21Q Crawler loaders-interior
Interior [2]
Generation-Komatsu D21Q Crawler loaders-exterior
Exterior [4]
Generation-Komatsu D21Q Crawler loaders-attachments
Attachments [2]
1979-1988
4,059.66 kg Breakout force
0.46 cu m Bucket capacity
4D94 Engine model
2.26 m Loader dump height
29.08 kw Net power
4,141 kg Operating weight

A compact crawler loader designed for light material handling and small construction work, the Komatsu D21Q combines a 4,141 kg operating weight with a 0.46 m³ bucket and a simple mechanical drivetrain. Powered by the Komatsu 4D94 engine producing 29.08 kW, the machine focuses on maneuverability and traction rather than high production loading.

Operating weight 4,141 kg

Net power 29.08 kW

Engine model Komatsu 4D94

Bucket capacity 0.46 m³

Breakout force 4,059.66 kg

Loader dump height 2.26 m

Compact crawler loader design

Suitable for light construction and landscaping

Makana rating

Owner rating

 | 3

Market average

AED 75,000

Starting from

AED 19,500

Komatsu D21Q technical specifications

Highlight differences
Komatsu D21Q-5

Komatsu D21Q-5

Komatsu D21S-3

Komatsu D21S-3

Komatsu D21S-5

Komatsu D21S-5

Loader
Breakout force 4,059.66 kg
Breakout force 1,791.69 kg
Breakout force 3,569.78 kg
Years 1979-1988
Years 1979-1988
Years 1979-1988
Market Average AED 75,000
Market Average AED 75,000
Market Average AED 75,000
Price AED 19,500
Price AED 19,500
Price AED 19,500
General
Bucket capacity 0.46 cu m
Bucket capacity 0.46 cu m
Bucket capacity 0.46 cu m
Displacement 2,933.29 cu cm
Displacement 2,605.55 cu cm
Displacement 2,933.29 cu cm
Engine model 4D94
Engine model 4D92-1
Engine model 4D94
Loader dump height 2.26 m
Loader dump height 2.07 m
Loader dump height 2.13 m
Loader dump reach 0.67 m
Loader dump reach 0.73 m
Loader dump reach 0.76 m
Max speed forward 4.51 kph
Max speed forward 6.92 kph
Max speed forward 4.51 kph
Operating weight 4,141 kg
Operating weight 3,900 kg
Operating weight 3,830 kg
Tipping load 2,340 kg
Tipping load 1,111 kg
Tipping load 2,231 kg
Service refill capacities
Cooling fluid cap 13.25 liter
Cooling fluid cap 14 liter
Cooling fluid cap 13.25 liter
Fuel cap 60.18 liter
Fuel cap 60.18 liter
Fuel cap 60.18 liter
Undercarriage
Ground pressure 0.24 bar
Ground pressure 0.39 bar
Ground pressure 0.37 bar
Number of track rollers per side 5
Number of track rollers per side 5
Number of track rollers per side 5
Track gauge 1.49 m
Track gauge 1.19 m
Track gauge 1.31 m
Track length 1.71 m
Track length 1.68 m
Track length 1.71 m
Track width 51.05 cm
Track width 30.23 cm
Track width 30.23 cm
Dimensions
Height - top of cab 2.19 m
Height - top of cab -
Height - top of cab 2.16 m
Length with bucket 3.47 m
Length with bucket 3.51 m
Length with bucket 3.57 m
Width over tracks 2.01 m
Width over tracks 1.49 m
Width over tracks 1.62 m
Ground clearance -
Ground clearance -
Ground clearance 0.34 m
Engine
Net power 29.08 kw
Net power 27.59 kw
Net power 29.08 kw
Download datasheets
OEM product brochure

Komatsu D21Q expert review

Reviewed by Marcis V. on March 12, 2026

Overview

The Komatsu D21Q is a compact crawler loader designed for light-duty construction and material handling. With a 4,141 kg operating weight, a 0.46 m³ bucket, and a 29.08 kW diesel engine, it provides reliable performance for small job sites.

Expert rating: 3 stars

Pros Compact crawler design provides strong traction and maneuverability on small work sites.
Cons Small bucket capacity and low engine power limit production capability.

Performance & Efficiency

The 29.08 kW engine and 4,059 kg breakout force provide enough power for light material handling tasks such as landscaping and small construction work.

In Comparison

Cat 935: Larger crawler loader with greater bucket capacity.
Cat 939: Similar class crawler loader used in construction projects.
Komatsu D21Q: Focused on compact size and simple operation.

Final Verdict

Rated 3 stars, the Komatsu D21Q remains a practical compact crawler loader within the AED 19,500–75,000 range.

Show less

Komatsu D21Q owner rating

Komatsu D21Q Crawler loaders [1979-1988]

1979-1988

Overall rating

Based on 3 ratings

4.3
performance

4.3

comfort

4.7

fuel efficiency

4.3

safety

4.3

features

4.0

5 stars

33 %

4 stars

67 %

3 stars

0 %

2 stars

0 %

1 stars

0 %

Pros
Compact crawler design works well on muddy or uneven ground where small wheel loaders struggle.
Cons
Small bucket capacity limits productivity for large material piles.
performance

4.0

comfort

5.0

fuel efficiency

4.0

safety

5.0

features

4.0

Valuation

1979

Komatsu D21Q similar models

Highlight differences
Komatsu D21Q-5
Komatsu D21Q-5
Cat 935C Series II
Cat 935C Series II
Cat 939C
Cat 939C
Loader
Breakout force 4,059.66 kg
Breakout force 6,848.35 kg
Breakout force 9,162.58 kg
Years 1979-1988
Years 1988-2025
Years 1994-2025
Market Average AED 75,000
Market Average AED 415,000
Market Average AED 432,000
Price AED 19,500
Price AED 197,000
Price AED 210,000
General
Bucket capacity 0.46 cu m
Bucket capacity 1.07 cu m
Bucket capacity 1.15 cu m
Displacement 2,933.29 cu cm
Displacement 5,201.27 cu cm
Displacement 4,998.07 cu cm
Engine model 4D94
Engine model 3204
Engine model 3046T
Loader dump height 2.26 m
Loader dump height 2.59 m
Loader dump height 2.68 m
Loader dump reach 0.67 m
Loader dump reach 0.88 m
Loader dump reach 0.88 m
Max speed forward 4.51 kph
Max speed forward 10.62 kph
Max speed forward -
Operating weight 4,141 kg
Operating weight 8,759 kg
Operating weight 9,483 kg
Tipping load 2,340 kg
Tipping load 5,804 kg
Tipping load 6,606 kg
Operating voltage -
Operating voltage -
Operating voltage 12 V
Service refill capacities
Cooling fluid cap 13.25 liter
Cooling fluid cap -
Cooling fluid cap 20.82 liter
Fuel cap 60.18 liter
Fuel cap 116.2 liter
Fuel cap 156.7 liter
Hydraulic fluid cap -
Hydraulic fluid cap 57.15 liter
Hydraulic fluid cap 56.78 liter
Undercarriage
Ground pressure 0.24 bar
Ground pressure 0.59 bar
Ground pressure 0.54 bar
Number of track rollers per side 5
Number of track rollers per side 5
Number of track rollers per side 6
Track gauge 1.49 m
Track gauge 1.42 m
Track gauge 1.55 m
Track length 1.71 m
Track length 1.92 m
Track length 2.16 m
Track width 51.05 cm
Track width 35.56 cm
Track width 40.64 cm
Ground contact area -
Ground contact area 34,291.65 cu cm
Ground contact area 44,245.17 cu cm
Number of shoes per side -
Number of shoes per side -
Number of shoes per side 37
Dimensions
Height - top of cab 2.19 m
Height - top of cab 2.68 m
Height - top of cab 2.77 m
Length with bucket 3.47 m
Length with bucket 4.33 m
Length with bucket 4.36 m
Width over tracks 2.01 m
Width over tracks 1.8 m
Width over tracks 1.98 m
Ground clearance -
Ground clearance 0.34 m
Ground clearance 0.4 m
Engine
Net power 29.08 kw
Net power 59.66 kw
Net power 67.11 kw
Alternator supplied amperage -
Alternator supplied amperage -
Alternator supplied amperage 55 Amh
Aspiration -
Aspiration -
Aspiration Turbocharged
Number of cylinders -
Number of cylinders -
Number of cylinders 6
Power measured @ -
Power measured @ -
Power measured @ 2,400 rpm
Operating specifications
Raise time -
Raise time 6 s
Raise time 6 s
Lower time -
Lower time 4 s
Lower time 3 s
Refill capacities
Engine oil cap -
Engine oil cap -
Engine oil cap 12.87 liter
Final drives fluid cap -
Final drives fluid cap -
Final drives fluid cap 14.76 liter
Hydraulic system
Pump flow cap -
Pump flow cap -
Pump flow cap 132.48 lpm
Pump type -
Pump type -
Pump type Gear
Relief valve pressure -
Relief valve pressure -
Relief valve pressure 198.22 bar

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