Komatsu designed interaxle and differential
locking systems
The full-time six-wheel drive system reduces slippage.
A wet multiple-disk interaxle clutch also locks the
three axles in unison for greater traction. The interaxle
lock and differential locks can be switched on and off
while the truck is travelling, thereby boosting produc-
tivity. In addition, the differential lock switch, which is a
three position switch, can lock up the rear axle differ-
entials only, or all axles for maximum performance in
the worst conditions.
Hydraulically controlled wet multiple-disc brakes
and retarder
Wet multiple-disk brakes have been proven on Komatsu
dump trucks and wheel loaders ensuring highly reliable and
stable brake performance. The large-capacity, continuously
cooled,wet-multiple disc brakes also function as a highly
responsive retarder which gives the operator greater confi-
dence at higher speeds when travelling downhill.
Retarder Absorbing Capacity (continuous descent):
389 kW
533 HP
Large capacity body and box
section frame structure
The HM400 has the large heaped
capacity of
22.3 m
3
29.2yd
3
body.
The low loading height of
2970 mm
9’9”
enables easy loading. The body is built
of high strength wear-resistant steel
with a Brinell hardness of 400, and the
body shape provides excellent load sta-
bility. Rugged enough for the toughest
jobs, the HM400’s frame is designed
using
a rigid box structure with connecting
torque tubes made of high strength low
alloy steel.
Articulated steering
Fully hydraulic articulated
steering offers low-effort
operating performance and
maneuverability. A mini-
mum turning radius of only
8.7 m
28’7” provides ability
to work in tight areas.
Komatsu designed electronically controlled
countershaft transmission
The Komatsu designed Electronically Controlled Transmission
called K-ATOMiCS has been a success in Komatsu’s rigid dump
trucks. The electronic clutch modulation system ensures proper
clutch pressure when the clutch is engaged. The total control
system controls both the engine and transmission by monitoring
the vehicle conditions. This high technology system assures
smooth shifts without shock and maximizes power train life.
5
HM400-1
ARTICULATED DUMP TRUCK
4
The combination of high travel speeds and an efficient engine with low emissions
delivers maximum productivity at the lowest cost.
Komatsu technology
Komatsu develops and produces all major components,
such as engines, electronics and hydraulic components,
in house.
With this “Komatsu Technology,” and adding customer
feedback, Komatsu is achieving great advancement
in technology.
To achieve both high levels of productivity and economical
performance, Komatsu has developed the main compo-
nents with a total control system.
The result is a new generation of high performance and
environment friendly machines.
High performance Komatsu SAA6D140E-5 engine
This engine delivers faster acceleration and higher
travel speeds with high horsepower per ton in its class.
Advanced technology, such as Common Rail Injection sys-
tem (CRI), air to air aftercooler, and an efficient turbo-charg-
er enables the engine to meet the North American EPA Tier
3 and EU Stage 3A emission regulations. High torque at low
speed, impressive acceleration, and low fuel consumption
ensure maximum productivity.
Engine power mode selection system
The system allows selection of the appropriate mode
between two modes <Power mode > or <Economy mode>
according to each working condition. The mode is easily
selected with a switch in the operator’s cab.
Power mode
Great productivity can be attained by taking a full advantage
of high output power. It is appropriate for job sites where
larger production at uphill-hauling is required.
Economy mode
Engine speeds of the maximum output, downshift, and
upshift are set to a lower level. It is appropriate for light
work on the flat ground.
4.17 m
13'8"
8.70 m
28'7"
Hydro-pneumatic suspension
The hydro-pneumatic suspension has been proven on Komatsu’s rigid dump trucks. The front
axle hydro-pneumatic suspension employs "De Dion" type design, allowing the machine to ride
more smoothly over bumps. The rear-axles are mounted on a dynamic equalizer structure
equipped with hydro-pneumatic suspension. The entire vehicle’s suspension delivers a comfort-
able ride and maximizes productivity.
P
RODUCTIVITY
F
EATURES
HM400
-2
ARTICULATED DUMP TRUCK
HM400
-2
A
R T I C U L A T E D
D
U M P
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R U C K
