Komatsu H75051 Operation & Maintenance Manual page 172

EXPLANATION OF COMPONENTS
The attachment selector switch is used to switch the bucket po-
sitioner and fork positioner.
(A) Bucket positioner
Set to this position when using the bucket.
(B) Fork positioner
Set to this position when using the fork.
REMARK
When the fork positioner is selected, the PZ auto tilt-in function
is not effective.
SPEED RANGE SELECTOR SWITCH
The speed range selector switch is used to change the travel
speed range of the machine.
Position (a): 1st speed
Position (b): 2nd speed
Position (c): 3rd speed
Position (d): 4th speed
REMARK
When traveling at high speed with 3rd or 4th speed range (trav-
el speed 8 km/h or more), even if the speed range is shifted to
1st or 2nd, the speed range does not change to 1st or 2nd in
order to prevent HST motor overrunning.
In such case, the centralized warning lamp lights up and the
alarm buzzer sounds.
To cancel the alarm buzzer, perform the following.
• Reduce the travel speed to 7 km/h or less. The speed
range becomes 1st or 2nd, and the alarm buzzer is can-
celed.
• Return the speed range selector switch to 3rd or 4th.
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, push the work equipment lock switch to lock the work equipment, turn
on the parking brake switch, 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