Komatsu D155A-6 Operation & Maintenance Manual page 180

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OPERATION
OUTLINE OF GEAR SHIFT MODES
There are two gear shift modes: automatic shift mode and manual shift mode. Select the mode to match the use.
Automatic shift mode (dozing mode)
This is the mode used for general dozing operations. If a load is applied, the transmission automatically shifts
down; when the load is removed, it automatically shifts up to the maximum set speed range. The torque converter
lock-up is actuated according to the load and the optimum speed range is automatically selected. As a result, this
mode provides excellent fuel consumption and production.
Manual shift mode (ripping mode)
This is the mode to use for dozing and ripping on rough ground. If a load is applied, the transmission automatically
shifts down, but when the load is removed, the transmission does not automatically shift up.
METHOD OF CHANGING GEAR SHIFT MODE
When switching between automatic shift mode and manual shift
mode, set the transmission to Neutral and press the gear shift
mode selector switch to change the gear shift mode.
GEAR SHIFT MODE SCREEN DISPLAY
The gear shift mode screen display is shown on the gear shift mode display portion of the monitor panel as follows.
(A) Automatic shift mode
(1) Present speed range
(2) Preset (speed range when moving machine off) and maximum
speed range when traveling
(3) (AUTO) mark displaying automatic mode
(4) (Dozing) mark displaying automatic mode
(B) Manual shift mode
(5) Present speed range
(6) Preset (speed range when moving machine off)
(7) (Ripping) mark displaying manual mode
OPERATION
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