5
4
P
RODUCTIVITY &
F
UEL
E
CONOMY
F
EATURES
D155AX
-6
CRAWLER DOZER
D155AX
-6
C
R A W L E R
D
O Z E R
Torque
converter
Engine
Transmission
Lockup “ON”
Lockup “OFF”
Travel performance curve
Dr
a
wbar pull ton
0
10
20
30
40
50
60
70
5
10
Fuel economy through
effective usage of engine
power (Decreased by
10%)
Automatic lockup
ON in the practical
dozing work range
Automatic
gearshift mode
Manual
gearshift mode
Travel speed (km/h)
Lockup mechanism of torque
converter is automatically
actuated to transfer engine
power directly to the
transmission in usual dozing
speed range. Locking up the
torque converter eliminates
loss of horsepower by 10%.
Because the electronically
controlled engine is extremely
efficient, a decrease in fuel
consumption is realized while
also maintaining machine
power.
SIGMADOZER
Based on a completely new digging theory, SIGMADOZER
dramatically improves dozing performance and increases
productivity. A new frontal design concept adopted for
digging and rolling up at the center of the blade increases
soil holding capacity, simultaneously reducing sideway
spillage. Reduced digging resistance produces smoother
flow of earth, enabling the dozing of larger quantities of soil
with less power. In addition, adoption of a new blade linkage
system holds the blade closer to the tractor for improved
visibility, enhanced digging force and reduced lateral sway
of the blade. This is the new generation blade.
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 lock up 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)
Fuel consumption decreased by
10%
(compared with our conventional model)
Outstanding productivity
Outstanding fuel economy
SIGMADOZER
Automatic transmission with
lockup torque converter
KOMATSU
SAA6D140E-5 engine
New fuel efficient bulldozer
New D155AX-6 has achieved both high levels of
productivity and fuel economy through usage of
SIGMADOZER and automatic transmission with
lockup torque converter. SIGMADOZER developed
based on completely new digging theory dramatically
increases production. New transmission with high
power transmission efficiency greatly reduces fuel
consumption. This bulldozer significantly improves
fuel efficiency compared with our conventional model.
D155AX-6
SIGMADOZER
D155AX-5
Semi-U blade
Shape of
dozed material
Shape of
dozed material
SIGMADOZER
Semi-U blade
SIGMADOZER
Automatic transmission with
lockup torque converter
15%
increase
25%
increase
10%
decrease
(Compared with
our conventional model)
FUEL
CONSUMPTION:
PRODUCTION:
FUEL
EFFICIENCY:
Automatic/manual gearshift 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 (selection 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.
Automatic gearshift
mode screen
Manual gearshift
mode screen
Production increased by
15%
(compared with our conventional model)
