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Fuel-efficient 4D94LE-2 Engine:
The Komatsu 4D94LE-2 features a
direct-injection fuel system. Intake air
is swirled into the combustion chamber
where it is mixed with injected,
atomized fuel, providing optimum
combustion. This fuel system not only
contributes to greater power and fuel
savings, but also insures reduced
noise and cleaner exhaust. A cushion
mounted engine reduces noise and
vibration.
CRAWLER DOZER
Efficient HYDROSHIFT
Transmission:
The D21-8E0 is equipped with Komatsu's
unique HYDROSHIFT transmission,
assuring smooth gear shifts, powerful
traction and low fuel consumption.
It consists of a damper and planetary
gear packs. The HYDROSHIFT
transmission makes two previously
incompatible factors compatible: It
efficiently converts engine power to
traction with minimal power loss
through a direct-drive transmission and
it offers smooth, easy shifting through
powershift transmission equipped with
a torque converter.
Unlike ordinary powershift
transmissions with torque converters,
traction does not decrease, even when
the engine is running at partial throttle.
Long Track:
The long track and well-positioned
center of gravity give good machine
balance and make grading operations
and operations on slopes easy. In
addition, the machine can travel over
soft ground easily, and it can escape
from muddy areas without problem.
D21A/P
HORSEPOWER
32.4 kW 43.4 HP @ 2450 rpm
OPERATING WEIGHT
D21A-8E0: 3710 kg 8,180 lb
D21P-8E0: 4100 kg 9,040 lb
BLADE CAPACITY
D21A-8E0: 0.50 m
D21P-8E0: 0.68 m
Simplified Maintenance:
Spin-on type filters are used throughout
the machine, making it easy to replace
filter elements. Air cleaner with
automatic evacuator extends cleaning
interval of the air cleaner.
Automatic De-airation System
with Electric Feed Pump:
Ejects air in the fuel system, simply
turning on the ignition key when
restarting the engine.
Injection nozzle
Filter
Electric
feed
pump
Injection
pump
Water separator
Lifetime Lubricated Idlers and
Track Rollers:
The D21-8E0 undercarriage features
longer life and reduced maintenance
costs with sealed track links, and
lifetime lubricated idlers and track
rollers. These eliminate any periodical
greasing for simplified maintenance and
minimize internal pin and bushing wear
for longer service life.
Lubricated Track Links
(optional):
Since the clearance between the link
pin and bushing is lubricated, wear and
pitch elongation are minimized for
extended service life. With lubricated
track, power loss due to pin and
bushing friction are reduced, increasing
operation comfort and performance.
0
-8E0
3
0.75 yd
3
3
0.89 yd
3
Fuel tank
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