Komatsu Galeo PC138US-8, Shop Manual

Page: 427 / 946

30 Testing and adjusting SEN02459-00
PC138US, USLC-8
45
Cylinder Cut-Out
The operator can perform "Cylinder Cut-Out" oper-
ation with the machine monitor.
"Cylinder Cut-Out" operation means to run the
engine with 1 or more fuel injectors disabled electri-
cally to reduce the number of effective cylinders.
This operation is used to find out a cylinder which
does not output power normally (combustion in it is
abnormal).
1. Selecting menu
Select "Cylinder Cut-Out" on the "Service
Menu" screen.
2. Selecting cylinder to be disabled
After the "Cylinder Cut-Out" screen is dis-
played, select a cylinder to be Cut-Out with the
function switches.
q
[F1]: Move selection mark (
R
) to left
q
[F2]: Move selection mark (
R
) to right
q
[F3]: Reset holding
q
[F4]: Hold
q
[F5]: Return to service menu screen
q
[F6]: Confirm selection
a
This operation may be performed while
the engine is running.
a
When [F6] is pressed, if background (a) of
the selected cylinder No. becomes white,
the cylinder is Cut-Out.
a
If the machine monitor Cut-Out a cylinder
but the engine controller cannot Cut-Out
that cylinder, the background (a) of the
cylinder No. becomes yellow.
a
One or more cylinders can be Cut-Out.
a
In the cylinder Cut-Out operation, the
a u t o - d e c e l e r a t i o n f u n c t i o n c a n b e
selected. If the auto-deceleration is turned
ON, auto-deceleration monitor (b) is dis-
played.
3. Resetting Cut-Out cylinder
When changing a cylinder to be Cut-Out or
when Cylinder Cut-Out operation is finished,
select a Cut-Out cylinder to be reset with the
function switches.
a
This operation may 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 resets a Cut-Out
cylinder but the engine controller cannot
reset that Cut-Out cylinder, the background
(a) of the cylinder No. becomes red.
a
The Cut-Out operation is not automatically
reset after the screen returns to the opera-
tor mode. Accordingly, be sure to perform
the resetting operation after the cylinder
cut-out operation is finished.
4. Function of holding displayed information
If [F4] is pressed during the cylinder Cut-Out
operation, the displayed information is newly
held (c) (The real-time information is kept dis-
played on the left side).
While the information is held, if [F3] is pressed,
the holding function is reset.
a
The holding function is effective, regard-
less of setting of the reduced cylinder
mode operation.