Komatsu Designed Differential
Locking Systems
T
he 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 can be switched on and off while the
truck is travelling, thereby boosting productiv-
ity. In addition, limited slip differentials pre-
vent the tires on either side from slipping on
soft ground.
Hydraulically Controlled Wet Multiple-Disc Brakes
and Retarder
Wet multiple-disc 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
confidence at higher speeds when travelling downhill.
Retarder Absorbing Capacity (continuous descent):
349 kW
468 HP
449 kW
602 HP
(with optional exhaust retarder)
Large Capacity Body and Box
Section Frame Structure
The 16.6 m
3
21.7 yd
3
heaped capacity
is among the highest in its class. The
low loading height of 2790 mm
9'2"
enables easy loading. The body is built
of thick wear-resistant steel with a
Brinell hardness of 400, and the body
shape provides excellent load stability.
Rugged enough for the toughest jobs,
the HM300’s frame is designed using
a rigid box structure with 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
7.96 m
26'1”
provides the free-
dom to move about in confined
areas.
Komatsu Designed Electronically Controlled
Countershaft Transmission
The Komatsu designed Electronically Controlled Transmission
called K-ATOMiCS has been successfully employed 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.
5
HM300-1
ARTICULATED DUMP TRUCK
4
The combination of high travel speeds and an efficient engine with low emissions
delivers maximum productivity at the lowest cost.
P
RODUCTIVITY
F
EATURES
P
RODUCTIVITY
F
EATURES
High Performance SAA6D125E-3 Komatsu Engine
This engine delivers faster acceleration and higher
travel speeds with the highest horsepower per ton in its
class. Advanced technology, such as Common Rail Injection
system (CRI), air to air aftercooler, and an efficient turbo-
charger enables the engine to suit low emission.
High torque at low speed, impressive acceleration, and low
fuel consumption ensures maximum productivity.
7.96 m
26'1"
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 comfortable
ride and maximizes productivity.
