Komatsu WA480-8 Operation & Maintenance Manual page 174

EXPLANATION OF COMPONENTS
REMARK
• If the gear speed switch is set to the 1st position, the gear
speed is fixed to the 1st speed. The gear speed is not shif-
ted automatically.
• The gear speed is shifted automatically between the set
gear speed of the switch and 2nd, depending on the travel
speed.
The gear speed is shifted down from the 2nd to the 1st
when the condition is met. Such condition includes press-
ing the kickdown switch of the boom control lever and
starting digging operation.
• In the auto-shift mode, if the travel speed is 12 km/h or
slower, the kickdown switch operates and the gear speed
can be shifted to the 1st from any gear speed of the for-
ward or reverse travel.
This function facilitates the load-and-carry operation.
• When the travel speed is higher than 12 km/h, the gear
speed is lowered by one level each time the kickdown
switch is pressed in the order of F4, F3, and F2 while the
gear speed switch is in F4, and in the order of F3 and F2
while the gear speed switch is in F3.
To select a gear speed for uphill or downhill travel or grading,
use the following procedure.
• When fixing the gear speed
Press HOLD switch on the boom control lever.
The gear speed is fixed to the one indicated on the trans-
mission indicator of the machine monitor.
• When shifting down and up a fixed gear speed
Shift the gear speed with the gear speed switch.
ENGINE SHUTDOWN SECONDARY SWITCH
NOTICE
The engine shutdown secondary switch is used to stop the engine when the starting switch is turned to
OFF position but the engine does not stop.
• Use the engine shutdown secondary switch only in an emergency.
Contact your Komatsu distributor for repair immediately when there is any abnormality on this
switch.
• If the engine shutdown secondary switch is set to STOP ENGINE position by mistake while the ma-
chine is operating normally, "Engine Shutdown Secondary SW in Operation" is displayed on the
machine monitor.
If "Engine Shutdown Secondary SW in Operation" is displayed on the machine monitor, check that
the switch cover is closed and the switch is in NORMAL position. If not, return it to NORMAL posi-
tion.
Lower the work equipment to the ground according to Safety, "PRECAUTIONS WHEN STANDING UP FROM
OPERATOR'S SEAT (2-18)", push the work equipment lock switch to lock the work equipment, turn the parking
brake switch ON, and turn the starting switch to OFF position.
If the engine does not stop, operate the engine shutdown secondary switch according to the following proce-
dure.
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OPERATION