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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

Summary of Contents for HD325-7

Page 1: ...it Vandalism protection shows the amount of increased weight ENGINE Automatic Idling Setting System AISS Alternator 50A 24V Batteries 2 x 12V 170Ah Engine Komatsu SAA6D140E 5 Mode selection system Starting motor 1 x 11 0 kW CAB Ashtray Cigarette lighter Cup holder Electronic dump control system Electronic maintenance display monitoring system Operator seat reclining suspension type with retractabl...

Page 2: ...ngine North American EPA Tier 3 and EU Stage 3A emission certified for 2006 Low operation noise Lead free radiator Brake cooling oil recovery tank Operator Environment Wide spacious cab with excellent visibility Ergonomically designed cab Easy to see instrument panel Ideal driving position settings K ATOMiCS with Skip shift function Hydropneumatic suspension Built in ROPS FOPS cab Viscous cab moun...

Page 3: ...utomatic K ATOMiCS transmission The K ATOMiCS Komatsu Advanced Transmission with Optimum Modulation Control System automatically selects the optimum gear according to vehicle speed engine speed and the shift position you ve chosen The result the best gear for any driving situation K ATOMiCS Komatsu Advanced Transmission with Optimum Modulation Control System High performance Komatsu SAA6D140E 5 en...

Page 4: ...t lever makes dumping easy A positioning sensor is installed for dump body control which significantly reduces the shock made by the lowering of the dump body K ATOMiCS with Skip Shift function An electronically controlled valve is provided for each clutch pack in the transmission for independent clutch engage ment disengagement It enables an ideal change in clutch modulation pressure and torque c...

Page 5: ...zed 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 mm2 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 Bra...

Page 6: ...kg mm2 184 900 psi high tensile strength steel Structure V shape body Material thickness Bottom 19 mm 0 75 Front 12 mm 0 47 Sides 9 mm 0 35 Target area inside length x width 5500 mm x 3380 mm 18 1 x 11 1 Dumping angle 48 Height at full dump 7925 mm 26 00 Heating Exhaust heating HYDRAULIC SYSTEM Hoist cylinder Twin 2 stage telescopic type Relief pressure 20 6 MPa 210 kg cm2 2 990 psi Hoist time 10 ...

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