Komatsu D155AX-8 Dozer - page 7

Automatic Transmission with Lockup Torque
Converter
A sharp reduction in fuel consumption and greater power train
efficiency is achieved by the 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 designed to
operate at maximum
efficiency. (Manual
gearshift mode is
selectable with a switch).
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 in 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
enabled, the gear automatically shifts down, but does not shift
up when the load is off. The operator can specify whether the
auto shift down function is enabled or disabled by selection in
the monitor.
Automatic gearshift
mode screen
Manual gearshift
mode screen
Travel performance curve
Drawbar 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)
Fuel consumption reduced by
10%
Compared to machine with manual shift transmission
Torque
converter
Engine
Transmission
Lockup “ON”
Lockup “OFF”
Torque
c nverter
Engine
Transmission
Lockup “ON”
Lockup “OFF”
Lockup mechanism of
torque converter is auto-
matically actuated to
transfer engine power
directly to the transmission
in usual dozing speed
range. Locking up the
torque converter
eliminates loss of horse-
power by 10%. Because
the electronically con-
trolled engine is extremely
efficient, a decrease in fuel
consumption is realized
while also maintaining
machine power.
D155AX-8
7
1,2,3,4,5,6 8,9,10,11,12,13,14,15,16
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