5
4
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 greater advancements
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. Advanced
technology, such as Common Rail Injection system (CRI),
air to air aftercooler, efficient turbo-charger, and heavy duty
cooled EGR enables the engine to be North American EPA
Tier 3 and EU stage 3A emission certified. High torque at
low speed, impressive acceleration, and low fuel consump-
tion ensure maximum productivity.
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 full advantage
of high output power. It is appropriate for job sites where
larger production uphill-hauling is required.
Economy mode (Variable horsepower)
The engine power automatically changes depending on
loaded or unloaded conditions always to use an optimum
speed gear. It is appropriate for light work on flat ground.
P
RODUCTIVITY
F
EATURES
OFF-HIGHWAY TRUCK
HD405
-7
O
F F
- H
I G H W A Y
T
R U C K
7-speed, fully automatic K-ATOMiCS transmission
The K-ATOMiCS (Komatsu Advanced Transmission with
Optimum Modulation Control
System) automatically selects
the optimum gear according
to vehicle speed, engine
speed and the shift position
you’ve chosen. The result:
the best gear for any driving
situation.
K-ATOMiCS
(Komatsu Advanced Transmission with
Optimum Modulation Control System)
Automatic Retard Speed Control (ARSC)
(Option)
ARSC allows the operator to simply set the downhill travel
speed and go down slopes at a constant speed. As a
result, the operator can concentrate on steering. The speed
can be set at increments of
1 km/h
0.6 MPH per click (±
5
km/h
3.1 MPH of maximum speed adjustment) to match
the optimum speed for the slope. Also, since the retarder
cooling oil temperature is always monitored, the speed is
automatically lowered.
Go down
slope
at
constant
speed
UP
SET
DOWN
CANCEL
AUTO RETARD
SPEED CONTROL
Fully hydraulic controlled wet multiple-disc
brakes and retarder
Wet multiple-disc brakes ensure 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
confidence at higher
speeds when travel-
ling downhill.
• Retarder Absorbing
Capacity (continuous
descent):
662 kW
887 HP
• Brake Surface Area
(rear):
50,847 cm
2
7,881 in
2
Long wheelbase and wide tread
With an extra-long wheelbase, a wide tread and an excep-
tionally low center of gravity, the HD405-7 hauls the load at
higher speed for more production, and delivers superior driv-
ing comfort over rough terrain.
Large high strength body
A wide target area makes for easy loading with minimal soil
spillage and more efficient hauling. The body is built of
160 kg/mm
2
227,520 PSI wear-resistant high-tensile steel
with a Brinell hardness of 500.
The V-shape design also increases structural strength, and
provides excellent load stability.
Small turning radius
The MacPherson strut type front suspension has a special
A-frame between each wheel
and the main frame. The
wider space created
between the front wheels
and the main frame
increases the turning
angle of the wheels. The
larger this turning angle,
the smaller the turning
radius of the truck.
7.2m
23'7"
A-frame
PLM
II
(Payload Meter
II
)
(Option)
PLM
II
allows the production volume and the working
conditions on the dump truck to be analyzed and controlled
directly via a personal computer. The system can store up
to 2900 working cycles.
In Cab
Laptop
RS232C
PLM
II
Memory card reader
Daily report
Note) The memory card, card reader and software for data processing are available as options.
Memory card
In Office
Automatic Idling Setting System (AISS)
This system facilitates quick engine warm-up and cab cool-
ing/warming. When setting the system ON, engine idle
speed is kept at 945 rpm when coolant temper-
ature is
50°C
122°F or lower. Speed automati-
cally returns to 725 rpm when coolant tempera-
ture reaches
50°C
122°F.
HD405
-7
