R
ELIABILITY
F
EATURES
E
ASY
M
AINTENANCE
HD325
-7
OFF-HIGHWAY TRUCK
HD325
-7
O
F F
- H
I G H W A Y
T
R U C K
9
8
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. Added reliability is designed into the
braking system by the use of three independent hydraulic
circuits providing 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 elimi-
nated.
High-rigidity frame
Cast-steel components are used in the
main frame for high-
stress areas where
loads and shocks are
most con-
centrated.
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
The oil cooler is installed in the radiator lower tank, improv-
ing the reliability of the hydraulic system during sudden tem-
perature rises. Further, in addition to the main filter, a 25-
micron line filter is at the entrance to the transmission con-
trol valve. This system helps to prevent secondary faults.
Extended oil change intervals
I
n order to minimize operating costs, oil change intervals
have been extended:
●
Engine oil 500 hours
●
Hydraulic oil 4000 hours
Centralized greasing
points
(Option)
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.
Protection functions supported by electronic control
Item
Function
! " #
$
% $
% $ " & $
! $
%
Rigorous dump body design
The body is built of
130 kg/mm
2
184,900 PSI wear-resistant
high-tensile steel with a Brinell hardness of 400.
The V-shape design also
increases structural
strength. The side and bot-
tom plates of the dump section
are reinforced with ribs for
added strength.
Antilock Braking System (ABS)
(Option)
Using its outstanding electronics technology, Komatsu is
the first in the industry to introduce ABS on construction
machinery. This system prevents the tires from locking, thus
minimizes skidding under slippery conditions while applying
the service brake.
Lead-free radiator
In addition to compliance with emission regulations, a lead-
free aluminum core is used for the radiator to meet with
global environmental requirements.
Automatic Spin Regulator (ASR)
(Option)
ASR automatically prevents the rear tires on either side
from slipping on soft ground for optimal traction.
Pedal-operated secondary brake
If there should be a failure in the foot brake, the parking
brake and front disc brakes are
activated as a pedal operated
secondary brake. In addition,
when hydraulic pressure drops
below the rated level, the park-
ing brake is automatically actu-
ated.
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.
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.
O-ring
Nipple
Hose
Disc wheels
(Flange type rims)
Disc wheels (Flange type
rims) provide easy
removal/installation for the
tires.
Parts colored with red show
cast-steel components
