Komatsu D51EXi-24, Operation & Maintenance Manual

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LED of the back grade mode switch lights up, and the back
grade mode indicator is displayed at the top of “AUTO” on
the control box screen.
While the back grade mode is turned on, when the joystick
(steering, directional and gear shift lever) is set to reverse posi-
tion (R), the blade automatic control operates as well similarly
to when the lever is set to FORWARD position (F).
• Blade automatic control starts when driving the machine
with LOWER trigger operation, and leveling work can be
performed when driving the machine in reverse.
For LOWER trigger operation method, see “METHOD FOR
ACTIVATING AUTOMATIC BLADE CONTROL”.
• Even when performing RAISE trigger operation, the blade
does not raise to specific height automatically. Operate the
blade control lever to RAISE position to raise the blade.
When the machine travels in reverse, the blade edge shape is not suitable for dozing. When the load on the
blade is excessive, the blade thrusts and the track slips.
Use this for finishing leveling when the height difference to the design surface is small.
Even if the back grade mode is turned on, when the joystick (steering, directional and gear shift lever) is in FOR-
WARD position (F), the blade automatic control works similarly to when the back grade mode is turned off.
• When leveling forward, move the machine forward by performing LOWER trigger operation, similarly to
when the back grade mode is turned off. The blade automatic control starts.
• When you do not level the ground by traveling forward, raise the blade by operating the blade control lever
in RAISE direction, and set the joystick (steering, directional and gear shift lever) to FORWARD position
(F). The blade automatic control starts only after LOWER trigger operation.
When blade automatic control is turned off (“AUTO” on control
box screen goes out), the reverser leveling mode is automati-
cally switched from on to off.
OPERATION MACHINE OPERATIONS AND CONTROLS
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