Komatsu ecot3 GALEO HM300-2 Operation And Maintenance Manual page 146

Articulated dump truck
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OPERATION
OPERATION
SHIFTING DOWN
If accelerator pedal (2) is released, the machine speed will be
reduced, and the transmission will automatically shift down.
DOWN SHIFT INHIBIT
If the shift lever is operated when the machine is traveling, and the travel speed is faster than the maximum speed
for each gear position, the transmission is not shifted immediately but is shifted down when the travel speed drops.
This prevents overrunning of the engine.
SHIFTING DOWN WHEN USING FOOTBRAKE
When using the footbrake to reduce the travel speed, the transmission is kept in 3rd speed for longer than normal
to reduce the shock when shifting gear.
OVERRUN PROTECTION DEVICE
If the engine speed reaches the red range on the engine tachometer during operation, the warning lamp and buzzer
will give a warning signal. If the machine travel and engine speed continues to increase the brakes will automatically
apply and slow the travel speed of machine to prevent over-speeding condition of the engine.
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