Komatsu PC138USLC Operation & Maintenance Manual page 126

OPERATION
Room Lamp Switch
NOTICE
It is possible to turn on the interior cab room lamp even when starting
switch is in the OFF position, do not forget to turn it off.
Use this switch (7) to light up the room lamp.
(a) ON position: Lamp lights up
(b) OFF position: Lamp goes out
The room lamp lights up even when the starting switch is at the
OFF position
Emergency Pump Drive Switch
NOTICE
This switch is provided to enable you to carry out operation temporarily, when any problem occurs on the pump control
system. Do not use it except in emergency. Furthermore, remove the cause of the problem immediately.
If this switch is depressed and moved to the EMERGENCY position by mistake, thereby engaging the machine in the work,
while the machine is in normal condition, an "E02" mark is shown in the display.
If "E02" is displayed during the work, check that the switch is in the NORMAL position.
This switch (8) is used to make it possible to carry out operations
temporarily if any problem should occur in the pump control system
(when the display shows "E02").
(a) EMERGENCY: When abnormal (move switch up)
(b) NORMAL: When normal (move switch down)
If the display shows "E02", move the switch up to make it possible
to carry out work.
Swing Parking Brake Release Switch
NOTICE
This switch makes it possible to perform swing operations for a short even when there is a problem in the swing parking brake
electric system. DO NOT use this switch except in emergencies. Repair the problem as soon as possible.
This switch (9) is used to make it possible to carry out operations
temporarily if any problem should occur in the swing parking brake
system (when the display shows "E03").
(a) FREE: When abnormal (move switch up)
(b) NORMAL: When normal (move switch down)
If the display shows "E03", move the switch up to the FREE
position, to make it possible to carry out work.
When pushing this switch up to the FREE position, the swing
lock monitor lamp begins to flash.
DETAILED CONTROLS AND GAUGES
3 - 71