Komatsu PC88MR-10 Shop Manual page 463

3. Selecting cylinder to be cut-out
After the "Cylinder Cutout Mode Operation"
screen is displayed, select a cylinder to be cut
out by using the function switches.
[F1]: Moves selection leftward
[F2]: Moves selection rightward
[F4]: Selects hold or releasing hold
(If the Hold is selected, a diagonal line is
drawn on the HOLD portion.)
[F5]: Returns the display to "Diagnostic
Tests" screen
[F6]: Enters selection
a This operation can be performed while the
engine is running.
a If background (a) of the selected cylinder
number becomes white after you press [F6],
the cylinder is cut out.
a If the machine monitor cuts out a cylinder but
the engine controller cannot cutout that
cylinder, the background (a) of the cylinder
number becomes yellow.
a One or more cylinders can be cut out.
a Auto-deceleration function can be selected in
the cylinder cutout mode operation. When
turning auto-deceleration ON, auto-
deceleration monitor (b) is displayed.
4. Releasing cut out cylinder
When changing a cylinder to be cut out or when
cylinder cutout operation is finished, select a cut
PC88MR-10
30 Testing and adjusting
out cylinder to be reset with the function
switches.
a This operation can be performed while the
engine is running.
a When [F6] is pressed, if background (a) of
the selected cylinder No. becomes blue, the
cylinder is reset.
a If the machine monitor releases a cutout
cylinder but the engine controller cannot
release the cutout cylinder, the background
(a) of the cylinder number becomes red.
a The cutout cylinder mode operation is not
automatically released after the screen
returns to the operator mode. Accordingly, be
sure to perform the releasing operation after
the cylinder cutout mode operation is
finished.
5. Holding displayed data
Each time [F4] is pressed during the cylinder
cutout operation, the displayed data is newly
held (c) (the real-time data is kept displayed on
the left side).
While the data is held, if [F4] is pressed, the data
holding function is reset.
a The holding function is available for a
cylinder, regardless of whether it is cut out or
not.
[Reference]
If a normally operating cylinder is cut out, the
following phenomena occur.
1) Lowering of engine speed
2) Fuel Inject Command (quantity)
increases.
If the engine is running at near high idle,
however, the engine speed may not lower for
the reason of engine control.
In this case, lower the engine speed with the
fuel control dial and judge by increase of the
injection rate command.
Electrical system
30-113