R
ELIABILITY
F
EATURES
E
ASY
M
AINTENANCE
HD785
-7
OFF-HIGHWAY TRUCK
HD785
-7
O
F F
- H
I G H W A Y
T
R U C K
11
10
Wet multiple-disc brakes and fully hydraulic con-
trolled braking systems
realize lower maintenance
costs and higher reliability. Wet disc brakes are fully sealed
to keep contaminants out, reducing wear and maintenance.
Brakes require no adjustments for wear, meaning even
lower maintenance. The parking brake is also an adjust-
ment-free, wet multiple-disc system for high reliability and
long life. Added reliability is designed into the braking sys-
tem by the use of three independent hydraulic circuits pro-
viding hydraulic backup should one of the circuits fail. Fully
hydraulic braking systems eliminate the air system so air
bleeding is not required, and water condensation that can
lead to contamination, corrosion and freezing is eliminated.
High-rigidity frame
Front support is integrated with the frame.
The frame rigidity is increased
drastically. As a result, flexural
rigidity and torsional rigidity that
are indicators of drivability and
riding quality are significantly
improved.
Komatsu components
Komatsu manufactures the engine, torque converter,
transmission, hydraulic units, and electrical parts on this
dump truck. Komatsu dump trucks are manufactured with an
integrated production system under strict quality control sys-
tem guidelines.
Sealed DT connectors
Main harnesses and
controller connectors are
equipped with sealed DT
connectors providing high
reliability, water resistance
and dust resistance.
Reliable hydraulic system
A large capacity oil cooler is installed in each hydraulic
circuit, improving the reliability of the hydraulic units during
sudden temperature rises. Further, in addition to the main
filter,
10
= 3 (min) line filter is located at the entrance to the
transmission control valve. This system helps prevent sec-
ondary faults.
Flat face-to-face
O-ring seals
Flat face- to- face O-ring
seals are used to securely
seal all hydraulic hose
connections and to prevent
oil leakage.
Extended oil change intervals
In order to minimize operating costs, oil change intervals
have been extended:
●
Engine oil 500 hours
●
Hydraulic oil 4000 hours
Disc wheels
(Flange type rims)
Disc wheels (Flange type rims)
provide easy removal/installa-
tion for the tires.
Vehicle Health Monitoring System (VHMS)
VHMS controller monitors the health conditions of major
components, enables remote analysis of the machine and its
operation. This process is supported by the Komatsu distrib-
utors, factory and design team.
Centralized greasing
points
Greasing points are central-
ized at three locations, it
enables to approach from
ground level.
Centralized arrangement of filters
The filters are centralized so
that they can be serviced
easily.
KOMATSU
WebCARE Server
Personal
computer
terminal
(for downloading
data)
Internet
Komatsu
distributors
Customer
job site
Satellite
communication (Option)
O-ring
Nipple
Hose
Protection functions supported by electronic control
Item
Function
! " #
$
% $
% $ " & $
! $
%
Rugged and durable dump body design
The standard dump body is made of high-tensile-strength
steel with a Brinell hardness of 400 for excellent rigidity
and reduced maintenance
cost. The V-shape and V-
bottom design also
increase structural strength.
The side and bottom plates of
the dump section are reinforced
with ribs for added strength.
Lead-free radiator
In addition to compliance with emission regulations, a lead-free aluminum core is used for
the radiator to meet global environmental requirements.
Brake cooling oil recovery tank
To protect the environment, a tank is installed to recover brake cooling oil in the event of
brake floating seal leakage.
Electric circuit breaker
A circuit breaker is adopted
in important electric circuits
that should be restored in a
short time when a problem
occurs in the electrical sys-
tem.
Advanced monitoring system
The Komatsu advanced monitoring system identifies main-
tenance items, reduces diagnostic times, indicates oil and
filter replacement hours and displays abnormality codes.
This monitor system helps to maximize machine production
time.
Payload Meter (PLM)
(Option)
PLM allows the production volume and the working condi-
tions on the dump truck to be analyzed and controlled
directly via a personal computer. And also the loadage is
indicated with the outside lamp. The system can store up to
2900 working cycles.
ECOLOGY
