Human-machine interface
Palm command
electronic controlled
travel control joystick
Ergonomically designed palm
command travel joystick
provides the operator with a
relaxed posture and superb
fine control without operator
fatigue. Transmission gear
shifting is simply carried
out with thumb.
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 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 RPM 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.
5
4
Komatsu’s new ergonomically designed control system “PCCS” creates an operating
environment with
“complete operator control”.
Power train electronic control system
Smooth and soft operation
D375A-5R uses a newly designed power train electronic control system. The controller registers the amount of operator control
(movements of lever and operation of switches) along with machine condition signals from each sensor to accurately calculate
the control of the torque converter, transmission, steering clutches and brakes for optimized machine operation. The ease of
operation and productivity of the new D375A-5R is greatly improved through these new features.
Electronic Controlled Modulation Valve (ECMV) controlled transmission
Controller automatically adjusts each clutch engagement depending on travel
conditions such as gear speed, RPM and shifting pattern. This provides
shockless, smooth clutch engagement, improved component reliability,
improved component life and operator ride comfort.
Electronic Controlled Modulation Valve (ECMV) controlled steering clutches/brakes
Sensors monitor machine operating conditions and electronically control steering clutches and brakes. Monitoring application
parameters, such as size of load during dozing, incline angle of slope, and load provides smooth and easy counter-steering on
downhill travel, etc.
Preset travel speed selection function
Preset travel speed selection function is standard equipment, enabling the operator to select fore and aft travel speed
from three preset patterns; F1-R1, F1-R2 and F2-R2 by using the UP/DOWN switch. When the F1-R2 or F2-R2 preset pattern
is selected and the travel control is moved into forward or reverse, the machine travels in the preset gear range automatically.
This function reduces manual gear shifting frequency during machine operation, enabling the operator to focus on directional
and hydraulic control. Preset travel speed selection is especially helpful when used in combination with the Auto-Downshift
Function and reduces cycle times during repeated round trip operations.
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 controller automatically downshifts to optimum
gear speed to provide high fuel efficiency. This function
provides comfortable operation and high productivity without
manual downshifting. (This function can be cancelled with
cancel switch.)
F1-R2 MODE
F1-R1 MODE
F2-R2 MODE
Press DOWN switch
Press DOWN switch
Press UP switch
Press UP switch
UP
DOWN
Indicator
Heavy load
Light load
Actuated on heavy load
or steep slope
Effect of ECMV steering clutches/brake control
Facing front
When turned 15°
Left-hand joystick
Blade and ripper
control joystick
MONITOR SYSTEM
Blade
control
lever
Ripper
control
lever
Travel
control
lever
Brake pedal
potentio meter
Acceleration
sensor
Service
switch
Auto shift
down switch
Fuel
control
dial
Steering controller
Monitor panel
Deceleration
pedal
Transmission
controller
Transmission control
Torque converter control
Implement control
Engine controller
Electronic controlled
transmission
Electronic controlled
steering/brake system
Engine
Torque converter
Transmission
control valve
Lockup
Engine
speed
Water
temp.
Fuel temp.
Engine oil
pressure
Fuel control
valve unit
ECMV
ECMV
ECMV
ECMV
ECMV
ECMV
ECMV
ECMV
Auxiliary
valve
Trans-
mission
output
speed
sensor
ECMV
Outline of electronic control system
Electronic Controlled
Modulation Valve (ECMV)
Conventional modulation valve
Time
Clutch pressure
P
ALM
C
OMMAND
C
ONTROL
S
YSTEM
(PCCS)
D375A
-5R
CRAWLER DOZER
D375A
-5R
C
R A W L E R
D
O Z E R
