Komatsu D375A-6 User manual

www.Komatsu.com Printed in Japan 200904 IP. AD (10)
CEN00372-00 Materials and specifications are subject to change without notice
is a trademark of Komatsu Ltd. Japan
HORSEPOWER
Gross: 474 kW 636 HP @ 1800 rpm
Net: 455 kW 610 HP @ 1800 rpm
OPERATING WEIGHT
71640 kg 157,940 lb
Photo may include optional equipment.
D375A-6
CRAWLER DOZER
D
375A

PCCS (Palm Command Control System)
●Electronic controlled PCCS travel control
●Hydraulic controlled PCCS blade/ripper control
●Fuel control dial
●Automatic/manual gearshift selectable mode
●Gearshift pattern preset function
●ECMV controlled transmission
See page 4.
Large TFT LCD monitor
●Easy-to-see and use 7" large multi-color monitor.
●Can be displayed in 10 languages for global support.
TFT : Thin Film Transistor
LCD : Liquid Crystal Display
See page 8.
2 3
D375A-5 Crawler Dozer
Simple hull frame
and monocoque track
frame with pivot shaft for
greater reliability.
Extra-low machine profile
provides excellent machine balance
and low center of gravity.
Large blade capacities:
18.5 m324.2 yd3(Semi-U dozer)
and 22.0 m328.8 yd3(U dozer)
Preventative maintenance
●Centralized Service Station
●Enclosed Hydraulic Piping
●Modular Power Train Design
●Oil Pressure Checking Ports
See page 9.
Photo may include optional equipment.
The Dual tilt dozer
(optional) increases
productivity while
reducing operator
effort.
See page 6.
Automatic transmission with lockup torque
converter increases speed and power to improve fuel
consumption and productivity.
See page 6.
New track link design
reduces maintenance cost by
making turning pins easier, with
improved pin reuse.
See page 9.
K-Bogie undercarriage system
improves traction, component durability,
and operator comfort.
See page 8.
Rippers (optional):
●Variable giant
●Multi-shank
See page 7.
New hexagonal designed cab includes:
●Spacious interior
●Comfortable ride with new cab damper mounting and K-bogie undercarriage
●Excellent visibility
●High capacity air conditioning system (optional)
●PCCS (Palm Command Control System) lever
●Pressurized cab (optional)
●Adjustable left armrest
●Travel control console integrated with operator seat
See page 8.
Track shoe slip control system (optional)
reduces operator fatigue.
See page 7.
Komatsu-integrated design
for the best value, reliability, and versatility.
Hydraulics, power train, frame, and all
other major components are engineered
by Komatsu. You get a machine whose
components are designed to work together
for higher production, greater reliability,
and more versatility.
Low-drive, long-track, eight roller undercarriage
provides outstanding grading ability and stability.
WALK-AROUND
D375A-6
HORSEPOWER
Gross: 474 kW 636 HP @ 1800 rpm
Net: 455 kW 610 HP @ 1800 rpm
OPERATING WEIGHT
71640 kg 157,940 lb
BLADE CAPACITY
Semi-U: 18.5 m324.2 yd3
Full-U: 22.0 m328.8 yd3
CRAWLER DOZER
D375A-6 CRAWLER DOZER
Hydraulic drive radiator cooling fan
controlled automatically, reduces fuel consumption
and operating noise levels.
See page 6.
ECMV (Electronic Controlled Modulation
Valve) controlled steering clutch/brake system
facilitates smooth and shockless steering operation.
See page 5.
SAA6D170E-5 turbocharged after-cooled
diesel engine provides an output of 474 kW 636 HP
with excellent productivity. This machine is EPA Tier 3
and EU stage 3A emissions certified.
See page 6.

Human-Machine Interface
Palm command
electronic controlled
travel control joystick
Palm command travel joystick
provides the operator with a
relaxed posture and superb
fine control without operator
fatigue. Transmission gear shifting is simplified with thumb
push buttons.
Fully adjustable suspension seat and travel control
console
For improved rear visibility during return part of cycle, the
operator can adjust the seat 15° to the right. The
transmission and steering controls move with the seat for
best operator comfort. The travel control console also has
adjustments fore and aft and for height. With an
independently adjustable armrest, each D375A operator
can adjust control positions to his individual preference,
providing optimum operational posture for
all operators.
Fuel control dial
Engine speed is controlled by electric signals, providing ease
of operation eliminating maintenance of linkage and joints.
Palm command PPC controlled blade control
joystick
Blade control joystick uses the
PPC (Proportional Pressure
Control) valve and the same
palm command type joystick as
travel control joystick. PPC
control, combined with the
highly reliable Komatsu
hydraulic system, provides
superb fine control. (Dual tilt and pitch operation are
activated by depressing switch with a thumb.This is available
with optional dual tilt dozer.)
Height adjustable blade control armrest
Blade control armrest is height adjustable without any tools
in three stages, providing the operator with firm arm support
and ideal armrest positioning.
Position adjustable ripper control lever
Ripper control lever is position adjustable, providing optimum
operation posture for all operators during ripping operations
facing front or watching ripper point.
54
Komatsu’s new ergonomically designed control system “PCCS” creates an operating
environment with “complete operator control”.
Power Train Electronic Control System
Smooth operation
D375A-6 uses a newly designed power train electronic control system.The controller registers the amount of operator control
(movements of lever and operation of switches) and machine condition signals from each sensor, and calculates to accurately
control torque converter, transmission, steering clutches and brakes for optimized machine operation. The ease of operation
and productivity of the new D375A-6 is greatly improved by numerous new functions.
ECMV (Electronic Controlled Modulation Valve) controlled transmission
Controller automatically adjusts each clutch engagement depending on travel
conditions such as gear speed, revolution and shifting pattern. This provides
shockless smooth clutch engagement, improved component reliability,
expansion of component life and operator riding comfort.
ECMV (Electronic Controlled Modulation Valve) controlled steering clutches/brakes
Sensors monitor machine operating conditions, and the controller activates ECMV electronically to control steering clutches
and brakes depending on type of job, such as size of load during dozing, incline angle of slope or load, providing smooth and
ease of operation by reducing counter-steering on downhill travel, etc.
Preset travel speed selection function
When the gearshift pattern is set to either <F1-
R2>, <F2-R2> or <F2-R3L> in automatic
gearshift mode, the gear is automatically
shifted, reducing round trip repetition work time
and operator's efforts.
When dozing and turning, ECMV automatically
controls stroke ratio of steering clutches
and brakes depending on degree of
load, enabling smooth dozing
and turning.
When dozing downhill, ECMV
automatically controls steering clutches
and brakes depending on incline of
machine or degree of load, reducing
counter-steering and producing
smooth dozing operation.
Auto downshift function
Controller monitors engine speed, travel gear and travel
speed. When load is applied and machine travel speed is
reduced, the transmission automatically downshifts to
optimum gear speed to provide high fuel efficiency. This
function provides comfortable operation without manual
downshift and high productivity.
F1-R1 MODE
Automatic
gearshift mode
F1-R2 MODE
F2-R2 MODE
Press DOWN switch
Press DOWN switch
Press UP switch
Press UP switch
F2-R3L MODE
Press DOWN switch Press UP switch
F1-R1 MODE
Shoe slip control
mode (optional)
F1-R2 MODE
Press DOWN switch Press UP switch
F1-R1 MODE
Manual
gearshift mode
F1-R2 MODE
F2-R2 MODE
Press DOWN switch
Press DOWN switch
Press UP switch
Press UP switch
UP
DOWN
Heavy load Light load
Actuated on heavy load
or steep slope
Effect of ECMV steering clutches/brake control
Facing front
When turned 15°
Blade and ripper
control joysticks
ECMV ECMV ECMV ECMV ECMV
EPC EPC
[Komnet]
Electronic
controlled
travel control
lever
Blade control
lever
Ripper control
lever
Fuel
control 
dial Brake pedal
Monitor panel
Rear view camere
(Option)
Orbcomm
controller
VHMS
controller
Deceleration
pedal
Transmission
control valve
Engine
controller
P/T controller
Transmission control,
Torque converter control,
Steering control
(Option) W/E controller
(Implement control)
Electronic controlled
transmission
Engine
Fan
motor
Fan
pump Lock up
Torque
convertor
control valve
Torque converter
Electronic controlled
steering/brake system
Acceleration
sensor
(Option)
Dual tilt and
pitch select
valve
(Option)
ECMV ECMV ECMV ECMV
Auxiliary
valve
Transmission
output speed
sensor
( )
Outline of electronic control system
Electronic Controlled
Modulation Valve (ECMV)
Conventional modulation valve
Time
Clutch pressure
CONTROL FEATURES
D375A-6
CRAWLER DOZER
D375A-6 CRAWLER DOZER
RH
DOWN SHIFT
UP SHIFT
F
LH
R

Rippers (optional)
●The variable giant ripper features a long sprocket center-to-ripper point distance, making
ripping operation easy and effective while maintaining high penetration force.
●The variable giant ripper is a parallelogram single shank ripper ideal for ripping tough
material. The ripping angle is variable, and the depth is adjustable in three stages by a
hydraulically controlled pin puller.
●The multi-shank ripper is a hydraulically controlled parallelogram ripper with three shanks.
Large blade
Capacities of 18.5 m324.2 yd3(Semi-U dozer) and 22.0 m3
28.8 yd3(U dozer) yield outstanding production. High-
tensile-strength steel comprising the front and sides of the
blade increase durability. The shape of the blade features
high load hauling efficiency. The end bit with improved cutting
performance is standard equipment.
Dual tilt dozer (optional)
The dual tilt dozer increases productivity while reducing
operator effort.
●Optimum blade cutting angle for all types of materials
and grades can be selected on-the-go for increased load
and production.
●Digging, hauling, and dumping are easy and smooth with
less operator fatigue.
●Dozer tilt angle and tilt speed are twice that of a
conventional single tilt system.
7
Torque
converter
Engine Transmission
Lockup “ON”
Lockup “OFF”
Fulcrum of major bogie
Fulcrum of minor bogie
Engine
The Komatsu SAA6D170E-5 engine delivers 474 kW 636 HP
at 1800 rpm. The fuel-efficient Komatsu engine, together
with the heavy machine weight, make the D375A-6 a superior
crawler dozer in both ripping and dozing production. The
engine is EPA Tier 3 and EU stage 3A emissions certified,
and features direct fuel injection, turbocharger, air-to-air
aftercooler and cooled EGR system to maximize fuel
efficiency.
To minimize noise and vibration, the engine is mounted
to the main frame with rubber cushions.
Hydraulic drive radiator cooling fan
Fan rotation is automatically controlled depending on
coolant and hydraulic oil temperature, saving fuel
consumption and providing great productivity with a quiet
operating environment.
Automatic transmission with lockup torque
converter
A sharp reduction in fuel consumption and greater power
train efficiency is achieved by the new automatic gearshift
transmission and lockup torque converter. The automatic
gearshift transmission selects the optimal gear range
depending on the working conditions and load placed on
the machine. This means the machine is always operating
at maximum efficiency. (Manual gearshift mode is
selectable with a switch)
K-Bogie undercarriage system
New K-Bogie undercarriage system combines prior
advantages with new additional features.
Current features:
●K-Bogies that oscillate with two fulcrums assure large
amount of track roller vertical travel. Impact load to
undercarriage components is minimized and durability of
components is improved since track rollers are always in
contact with track link.
●Track rollers follow track link movement to extend the
undercarriage life.
●Excellent riding comfort is provided due to less vibration
and shock when traveling over rough terrain.
Features on new K-Bogie undercarriage system:
●New K-Bogies with front and rear single bogies are utilized
providing increased length of track on ground to improve
machine stability and leveling performance.
●The oscillating idler and increased sprocket lead angle
improve riding comfort when travelling over rough terrain.
6
PRODUCTIVITY FEATURES
D375A-6
CRAWLER DOZER
D375A-6 CRAWLER DOZER
Manual
gearshift
mode screen
Automatic
gearshift
mode screen
Gearshift mode
selector switch
Working mode
selector switch
Shoe slip control
mode screen
(optional)
Track shoe slip control mode (optional)
●Eliminates the need for the operator to constantly control engine power output with the decelerator pedal while ripping.
Operator fatigue is substantially reduced.
●Maneuverability is improved because the operator is free to focus on the ripping application without having to monitor the
track shoe slippage.
●Repair costs are significantly lowered and undercarriage life is prolonged with the reduction in track shoe slippage.
●The track shoe slip control system will contribute to lower fuel costs, because the engine output is automatically controlled
to optimum levels for operation.
Automatic/manual gearshift and shoe slip control (optional) selectable mode
Automatic or manual gearshift modes can be selected with ease to suit the work at hand by simply pressing the switch on the
multi-monitor (The mode can be selected when the travel control joystick is at NEUTRAL.).
●Automatic gearshift mode
The mode for general dozing. When a load is applied, the gear automatically shifts down, and when the load is off, it
automatically shifts up to a set maximum gear speed. This mode economizes both fuel and production where the torque
converter lockup mechanism is actuated according to load, automatically selecting the optimum gear speed.
●Manual gearshift mode
The mode for dozing and ripping rough ground. When loaded, the gear automatically shifts down, but does not shift up when
the load is off.
Working mode
This mode can be set to either “P mode” for the maximum power or “E mode” for energy saving operation. Combined with the
automatic gearshift mode or manual gearshift mode, the working mode allows the operator to select the optimum machine
operating condition for the work at hand. (The mode can be switched during operation.)
P mode
E mode

98
Preventative Maintenance
Preventative maintenance is the only way to ensure long service life from your equipment. That’s why Komatsu designed the
D375A-6 with conveniently located maintenance points to make necessary inspections and maintenance quick and easy.
Low Maintenance Costs
Hexagonal pressurized cab
●The cab’s new hexagonal design and large tinted glass
windows provide excellent front, side and rear visibility.
●Air filters and a higher internal air pressure combine to
prevent dust from entering the cab.
Fresh air intake from rear of engine hood
The air conditioner air intake port is now located at the rear
of the engine hood where there is minimal dust. As a result,
the air inside the cab is always clean. Cleaning interval
of the filter is greatly extended, and use of a new structure
filter element facilitates cleaning and replacement.
Large multi-lingual LCD color monitor
A large user-friendly color monitor enables safe, accurate
and smooth work. Improved screen visibility is achieved by
use of TFT (Thin Film Transistor) liquid crystal display that
can easily be read at various angles and lighting conditions.
Simple and easy to operate switches. Industry first function
keys facilitate multi-function operations.
Display data in 10 languages to globally support operators
around the world.
Comfortable ride with new cab damper mounting
and K-Bogie undercarriage
D375A-6’s cab mount uses a new cab damper
mounting which further improves viscous damper and
provides excellent shock and vibration absorption capacity
with its long stroke. The cab damper mounting, combined
with new K-bogie undercarriage, softens shocks and
vibrations while traveling over adverse condition that are
impossible to absorb with conventional cab mounting
methods. The soft spring cab damper isolates the cab
from machine body, suppressing vibrations and providing
a quiet, comfortable operating environment.
New suspension seat
D375A-6 uses a new suspension seat. Fore and aft sliding
rails and suspension spring increases strength and rigidity
and reduces play of joints.
New seat provides excellent support and riding comfort. Fore
and aft sliding amount is designed to fit all operators.
In addition, air suspension seat with seat isolator is optionally
available, that reduces vertical and lateral vibrations more
effectively.
Photo may include optional equipment.
Track link with wedge ring
New D375A-6 track links feature
reduced press-fit force and a
wedge ring. Conventional track
pins are retained only with a large
press-fit force. The new track link
divides pin forces between the
wedge ring and press-fit force.This
results in easier service with
reduced pin damage when turning
pins and bushings. The result is
improved undercarriage life and reduced maintenance cost
through reduced wear, greater pin reusability, and reduced
maintenance man-hours.
Highly reliable electric circuit
The electrical circuit reliability is increased by utilizing dust,
vibration and corrosion resistant "DT connectors". The
reinforced electrical wiring harnesses include a circuit
breaker and are covered with a heat-resistant material to
increase mechanical strength, provide longer life, and
protect the system from damage.
Flat face O-ring seals
Flat face O-ring seals are used to securely seal all
hydraulic hose connections and to prevent oil leakage.
Enclosed hydraulic piping
Hydraulic piping for the blade tilt cylinder is completely
housed in the push arm protecting it from damage.
Modular power train design
Power train components are sealed in a modular design
that allows the components to be dismounted and mounted
without oil spillage, making servicing work clean, smooth,
and easy.
Maintenance-free disc brakes
Wet disc brakes require less maintenance.
Wedge ring
Pin press fitting
force +
wedge ring
holding force
Track
guiding
guard
WORKING ENVIRONMENT
D375A-6
CRAWLER DOZER
D375A-6 CRAWLER DOZER
EASY MAINTENANCE
Multi-monitor with troubleshooting function to
prevent critical machine troubles
Various meters, gauges, and warning functions are centrally
arranged on the multi-monitor. Offers ease of start-up
inspection and promptly warns the operator with a lamp and
buzzer if any abnormalities should occur. In addition,
countermeasures are indicated in 4 stage codes to ensure
safety and prevent the machine from major problems.
Replacement times for oil and filters are also indicated.
Centralized service station
To ensure convenient maintenance, the transmission
and torque converter oil filters are both arranged next to
the power train oil level gauge.
Oil pressure checking ports
Pressure checking ports for power train components are
centralized to promote quick and simple diagnosis.
Enlarged engine room
Engine room space is enlarged by increasing engine
hood height, facilitating maintenance of the engine and
related equipment. Solid engine hood prevents dust
and rain from entering and keeps the engine clean.
Gull-wing engine side covers
Gull-wing engine side covers facilitate engine maintenance
and filter replacement. Side covers are a thick two-piece
structure with bolt-on latch to improve durability and
repairability.
Photo may include optional equipment.
Extra switches
Basic operation
switches
Function
switches
Indicators
Rubber
Silicon Oil
Spring
Rubber Boot
Cab damper mounting
Maintenance warning screen
Abnormality warning
screen
Maintenance List screen
for replacement time
display