4
5
WA380
-6
P
ALM
C
OMMAND
C
ONTROL
S
YSTEM
(
PCCS
)
D61
-15E0
CRAWLER DOZER
D61EX/PX
-15E0
C
R A W L E R
D
O Z E R
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.
Full-adjustable suspension seat and travel control
console
The travel control console has adjustment fore and aft, and
height.
For improved rear visibility during reverse operations, the
operator can adjust seat 15° to the right. (optional)
Palm command
PPC controlled
blade control joystick
Blade control joystick uses the
Proportional Pressure Control
(PPC) valve and joystick is
similar to the travel control
joystick. PPC control combined
with the highly reliable Komatsu hydraulic system enables
superb fine control.
Fuel control dial
Engine revolution is controlled by electric signal, providing
ease of operation, eliminating maintenance of linkage and
joints.
Height adjustable armrest
Armrest height is adjustable without any tools, providing the
operator with firm arm support in an ideal armrest.
Komatsu’s ergonomically designed control system “PCCS” creates an operating environment
with
“complete operator control”.
Blade
control joystick
Outline of electronic control system
Human-machine interface
Monitor panel
Deceleration
pedal
Engine
HSS
Fuel control
valve unit
Water
temp
Intake
manifold
temp
Engine
oil
pressure
Transmission
control valve
Electronically controlled
transmission
ECMV
ECMV
ECMV
ECMV
EPC
Control
valve
Travel
control
lever
Fuel
control
dial
Pre-set mode
switch
Auto shift
down switch
EPC
Trans-
mission
output
speed
sensor
Engine
speed
Engine
controller
Steering &
Transmission
controller
Slope sensor
Brake pedal
potentiometer
ECMV
MONITOR SYSTEM
Power train electronic control system
Smooth and soft operation
D61EX/PX utilizes 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 calculate
accurately the control of the transmission for optimal machine operation. The ease of operation and productivity of the new
D61EX/PX 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, revolution and shifting pattern. This provides smooth shockless clutch
engagement, improved component reliability, improved component life and operator ride
comfort.
Hydrostatic Steering System—smooth, powerful turning
The Hydrostatic Steering System (HSS) is powered by an independent hydraulic pump with
engine power transmitted to both tracks without power interruption on the inside track. When the
machine turns, the outside track moves faster and the inside slower, for smooth, powerful
turns. Counter-rotation is available for minimum turning radius providing excellent
maneuverability. Shock-free steering reduces machine vibration and minimizes operator
fatigue.
Preset travel speed function
Preset travel speed selection function is provided as standard equipment. The preset switch enables the operator to select a
combination of forward/reverse gear shifts, from 5 patterns; F1-R1, F1-R2, F2-R1, F2-R2 and F2-R3, by using UP/DOWN
shift switch, and once the shift pattern is selected, only forward / reverse direction control selection is required. Once F2-R2
pattern is selected, for example, 2nd gear is automatically selected when travel control joystick is moved into
forward/reverse. This function reduces gear shifting frequency during machine operation, and is especially helpful, when
used in combination with auto-downshift function.
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 optimize gear speed to
provide high fuel efficiency. This function provides comfortable
operation and high productivity without manual downshifting. (This
function can be deactivated with cancel switch.)
F1-R1 MODE
F1-R2 MODE
F2-R2 MODE
Press DOWN switch
Press DOWN switch
Press UP switch
Press UP switch
F2-R3 MODE
Press DOWN switch
Press UP switch
F2-R1 MODE
Press DOWN switch
Press UP switch
UP
DOWN
Electronic Controlled
Modulation Valve (ECMV)
Conventional modulation valve
Time
Clutch pressure
Actuated on heavy
load or steep slope
●
Turning while dozing— the machine turns by driving the
left and right tracks under power at different speeds
allowing the machine to travel at the same speed as in
straight dozing.
●
Side cutting— when side-loading the blade, straight travel
can be maintained utilizing HSS.
●
On downhill slopes— the
machine doesn’t require
counter-steering. The joystick
provides the same steering response
on downhill slopes as on flat ground.
●
Grading— can be done efficiently without damaging the
ground, because the inside track is not locked during
turning.
Steering planetary
gear units
Hydraulic motor
Brakes
Heavy load
Light load
