Komatsu BR380JG-1E0, Руководство по ремонту, Страница: 336 / 841

SEN02304-00 30 Testing and adjusting
30
BR380JG-1E0
4) Engine speed holding function
Pressing [
E
] switch while the engine
operation on cylinder cut out screen is
turned on holds the engine speed and its
speed is newly displayed in the lower
space.
Pressing [
R ] switch during holding can-
cels the holding function and deletes the
display in the lower space.
a
If the holding function is used, the
held speed is displayed in the lower
space along with ( ) and the upper
space continuously displays the cur-
rent speed.
a
The holding function is usable inde-
pendent of the currently set mode –
the cylinder cut out or not.
[Reference]: Using the holding function effectively
The engine speed being displayed on the screen
through the holding function remains on it until the
holding is cancelled. In other words, enabling or
disabling of the cylinder cut out mode does not
affect the display.
Thus, when identifying a failed cylinder quicker, fol-
lowing operation is effective.
(1) Run the engine from the normal operation
mode (no cylinder cut out) and then hold the
speed of that time.
(2) Specify the cylinder to be diagnosed as the cut
out.
(3) Run the engine under the same condition as
that for (1). Then compare the engine speed at
that time and the held speed being displayed
to diagnose the cylinder.
(4) Reset a cut out cylinder independent of the
fluctuations in the engine speed.
(5) Repeat above steps (2) to (4) and then com-
pare the results against that obtained from
other cylinders.
a
If the diagnosis identified a cylinder on which
there was no decrease in the engine speed or
the decrease was small, it can be safely
judged that there must be some abnormalities
in its combustion.