Komatsu PC138US-11 Operation & Maintenance Manual page 159

OPERATION
HORN SWITCH
The horn switch is used to sound the horn.
Press the horn switch on the R.H. work equipment control lev-
er, and the horn sounds.
ROOM LAMP SWITCH
NOTICE
If the room lamp is left to be turned on, the batteries may
be exhausted. Always turn the switch to OFF position after
using room lamp.
Use room lamp switch to light up the room lamp.
(a) ON position
Lights up
(b) OFF position
OFF
The room lamp lights up even when the starting switch is at OFF position.
PUMP SECONDARY DRIVE SWITCH
NOTICE
• The pump secondary drive switch enables you to operate the work equipment or the machine tem-
porarily when any problem occurs on the pump control system. Do not use it except for emergency.
Repair the problem as soon as possible.
• If this switch is moved to Emergency position by mistake while the machine is operating normally,
"L02" is displayed on the machine monitor.
If "L02" is displayed during operation, press the monitor function switch F5 to check whether the
current failure code includes any of the hydraulic system errors "DXA9KB", "DXA8KB", "DXA9KA",
and "DXA8KA". Then make sure this switch is set to "Normal" position.
The pump secondary drive switch is a switch which enables the
work equipment or the machine to perform operation temporari-
ly when any problem occurs on the pump control system.
(a) In an emergency
When abnormal (switch is set to upper position)
(b) Normal
When normal (switch is set to lower position)
WENAM00111
EXPLANATION OF COMPONENTS
3-89