Automatic selection
Selection with the switch
700
800
900
kW
P
E
Power
mode
Economy
mode
895kW
(1200HP)
809kW
(1085HP)
750kW
(1005HP)
698kW
(936HP)
5
HM350-1
ARTICULATED DUMP TRUCK
4
P
RODUCTIVITY &
E
CONOMY
F
EATURES
HD785
-7
OFF-HIGHWAY TRUCK
HD785
-7
O
F F
- H
I G H W A Y
T
R U C K
Mode selection system with VHPC
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. When the key
switch is turned on, Economy mode is selected automati-
cally. Select Power mode by using the switch when needed.
AP-FOUR (Anti-pitching 4-wheel oil-cooled multi-
ple disc retarder)
The machine is equipped with 4-wheel retarder “AP-FOUR
(Anti-pitching 4-wheel oil-cooled multiple disc retarder)” that
applies retarding force on all four wheels. With this retarder,
the retarding force is shared between four wheels.
This reduces the possibility of tire-lock and enables effec-
tive use of retarder capacity, allowing stable downhill travel.
The machine descends slopes smoothly and comfortably
without machine body pitching since retarding force on
front and rear wheels is controlled independently.
Auto Retard Speed Control (ARSC)
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 setting 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.
High performance Komatsu SAA12V140E-3
engine
This engine delivers faster acceleration and higher travel
speeds with high horsepower per ton. Advanced technology,
such as High Pressure Common Rail injection system
(HPCR), air-to-air aftercooler efficient turbo-charger
enables the engine to be North American EPA Tier 2 emis-
sion certified. High torque at low speed, impressive acceler-
ation, and low fuel consumption ensure maximum productiv-
ity.
Go down
slope at
constant
speed
UP
SET
DOWN
CANCEL
AUTO RETARD
SPEED CONTROL
Conventional
AP-FOUR
R : Retarder
( 2-Wheel )
F, R : Retarder
( 4-Wheel )
• Retarder absorbing capacity
1092 kW
1,464 HP (continuous descent)
• Brake surface area
Front total :
37467 cm
2
5,807 in
2
Rear total :
72414 cm
2
11,956 in
2
F7-R2 (RH/RL) fully automatic transmission
The transmission is configured with 7 forward and 2
reverse gears. Fully automatic control is applied to all for-
ward gears and an optimum gear is automatically selected
according to the travel speed
and engine speed. The shift-
ing point is automatically
selected depending on the
acceleration of the machine
to reduce excessive fuel
consumption.
VHPC (Variable horsepower control)
Both in Power and Economy modes, the VHPC system
detects whether machine condition is loaded or unloaded
and selects optimum horsepower setting mode, providing
both high production and low fuel consumption.
Power mode:
Makes best use of the horsepower to
attain optimal production. This mode is suitable for operation
in job sites including uphill travel with load where throughput
takes top priority.
Economy mode:
Sets the maximum horsepower at low
level to reduce fuel consumption. The machine maintains
sufficient power for normal operation in this mode.
Two-speed selective reverse gears (RH/RL)
In order to meet various operating conditions, two reverse
gears are provided. The switch on the panel allows the
operator to select optimum reverse gear of RH or RL
depending on the job site conditions at hand. Furthermore,
the reverse gear is equipped with a lockup clutch, just like
forward gear, allowing the operator to reverse the machine
without worrying about overheating.
RH
Suitable for normal operation. Thanks to the lockup clutch,
the machine can be reversed at higher speed than the cur-
rent machine while having the same rimpull.
RL
Suitable for operation in job sites where there are steep
grades.
