Komatsu PC290LC-6K Operation & Maintenance Manual page 63

13. CAB LAMP SWITCH
This lights up the cab lamp.
ON position: Lights up
The cab lamp can be turned on even when the starting switch
is at the OFF position, so be careful not to leave it on by mistake.
14. PUMP CONTROL OVERRIDE SWITCH
When normal: Switch is down
When abnormal: When the monitor display shows E02 (PC valve
system error), it is possible to carry out operation when this switch is
moved up.
The pump control override switch is designed to allow operations to
be carried out for a short period when there is an abnormality in the pump
control system (PC valve system error). The abnormality must be re-
paired immediately.
15. SWING LOCK OVERRIDE SWITCH
When normal: Switch is down
When abnormal: When the monitor display shows E03 (swing brake
system error), the brake is cancelled and it becomes possible to swing
the upper structure when this switch is moved up, so normal operations
can be carried out. However, the swing brake remains cancelled.
The swing lock override switch is designed to allow operations to be
carried out for a short period when there is an abnormality in the swing
brake electrical system (swing brake system error). The abnormality must
be repaired immediately.
11. EXPLANATION OF COMPONENTS
2-19