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 productivity. In addition, limited slip differentials
prevent the tires on either side from slipping on soft ground.
Hydraulically Controlled Wet Multiple-Disc Brakes
and Retarder
Wet multiple-disc brakes with proven performance in larger
articulated and rigid trucks are tailored for use in the HM300.
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):
370 kW
496 HP
Large Capacity Body and Box
Section Frame Structure
The HM300 has the large heaped
capacity of
16.6 m
3
21.7yd
3
body.
The low loading height of
2790 mm
9’2”
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 HM300’s frame is designed
using a rigid box structure with connect-
ing 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
7.96 m
26’1” 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
HM300-1
ARTICULATED DUMP TRUCK
4
The combination of high travel speeds and an efficient engine 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 SAA6D125E-5 Engine
Powerful turbocharged and air-to-air aftercooled Komatsu
SAA6D125E-5 engine provides
254 kW
340 HP.
This engine realizes high power in low fuel consumption
with Common Rail Injection system (CRI), and thus
it delivers higher travel speeds with high horsepower.
Also 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.
4.01 m
13'2"
7.96 m
26'1"
Hydro-pneumatic Suspension
Hydro-pneumatic suspension with proven performance in larger articulated and rigid trucks is
tailored for use in the HM300.
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
HM300
-2R
ARTICULATED DUMP TRUCK
HM300
-2R
A
R T I C U L A T E D
D
U M P
T
R U C K
