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 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 revolution is controlled by electric signals, providing
ease of operation and reducing problems caused by linkage
joint seizure.
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, enables superb fine
control. (Dual tilt and pitch operation are enabled by
depressing switch with a thumb. This is available when
installing 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
D375A-5
CRAWLER DOZER
4
PCCS
(
PALM COMMAND
CONTROL SYSTEM
)
PCCS
(
PALM COMMAND
CONTROL SYSTEM
)
K
omatsu develops new ergonomically designed control system “PCCS” creating an operating
environment with
“complete operator control”.
Power Train Electronic Control System
Smooth and Soft Operation
D375A-5 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-5 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 electronically 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
Preset travel speed selection function is standard equipment, enabling the operator to select fore and aft travel speed
among three preset patterns such as F1-R2, F2-R2 and manual shift. When F1-R2 or F2-R2 preset pattern is selected, and
travel control joystick moves to forward/rearward direction, the machine travels forward/rearward with F1-R2 or F2-R2 speed
automatically. This function reduces operating hours and operator’s gear shifting time 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-shift Down Function
Controller monitors engine speed, travel gear, and travel
speed. When load is applied and machine travel speed is
reduced, the controller automatically shifts down to optimum
gear speed to provide high fuel efficiency. This function
provides comfortable operation without manual downshift
and high productivity. (This function can be cancelled with
cancel switch.)
F2-R2
F1-R2
MANUAL MODE (F1-R1)
F1-R2 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
F1-R2
F2-R2
Blade
control
lever
Ripper
control
lever
Travel
control
lever
Brake pedal
potentio meter
Pitch
angle
sensor
Acceleration
sensor
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
Auxilliary
valve
Trans-
mission
output
speed
sensor
ECMV
Outline of Electronic Control System
Electronic Controlled
Modulation Valve (ECMV)
Conventional modulation valve
Time
Clutch pressure
