Komatsu D51EXi-24, Operation & Maintenance Manual

Page: 69 / 194

In the work on a sharp slope, sideway or downhill operation is more efficient than uphill operation.
(T) Design surface
When waves may occur during leveling work and the leveled surface may be rough, the possible causes of this
phenomenon are as follows.
Find out the cause and take remedies.
Main causes Remedy
Hydraulic oil temperature is
low. Perform warm-up operation until pointer of hydraulic oil temperature gauge enters
green range.
Operation is not suitable for
blade automatic control. The following works are not suitable for the blade automatic control and can lower the
response of blade. Turn off the blade automatic control, and operate blade with blade
control lever.
•
Cutting or ditching into hard or frozen ground
•
Work on a place where soil condition is uneven
Leveled surface may be uneven at place where the ground hardness
changes.
Sharp turn on a slope When the machine turns sharply on a slope or its direction is changed suddenly by
rock, etc., finishing accuracy can lower.
When turning the machine on a slope, increase the turning radius.
Travel speed is too high. Depending on the type of soil, if the travel speed is too high, the leveled surface may
be uneven.
Decrease the travel speed.
Wrong setting of gain adjust-
ment for blade automatic
control Check if contents of setting of gain adjustment is suitable for soil type, and adjust
again if necessary.
For details, see “ADJUST GAIN OF AUTOMATIC BLADE CONTROL”.
Insufficient receiving state of
GNSS satellite Check that sufficient visibility is secured over GNSS antenna.
Check that there is no obstacle such as a tree, building, vehicle, cliff, etc. which
blocks or reflects the signals from the satellite.
OPERATION MACHINE OPERATIONS AND CONTROLS
3-55