Komatsu D31EX-21, Operation & Maintenance Manual, Page: 89 / 256

OPERATION
EXPLANATION OF COMPONENTS
3-37
If the operating load increases, the travel speed will slowly decrease and the transmission will shift down. When
the load becomes lighter again, the transmission will shift up to the set travel speed.
When the transmission automatically shifts down, the speed range display does not change.
BRAKE PEDAL
WARNING
Do not place your foot on this pedal unnecessarily.
This pedal (3) is used for making emergency stops; do not use
it except in emergencies.
When the pedal is depressed, the parking brake is applied and
the machine stops suddenly.
When traveling on flat ground, use the decelerator pedal to
stop the machine.
DECELERATOR PEDAL
WARNING
q
Do not place your foot on this pedal unnecessarily.
q
When passing over the top of a hill or when a load is dumped over a cliff, the load is suddenly
reduced, so there is danger that the travel speed will also increase suddenly. To prevent this, depress
the decelerator pedal to reduce the travel speed.
q
When traveling on flat ground, the decelerator pedal can be used to stop the machine. However, this
does not mean that the brake is applied. On slopes, even if the decelerator pedal is depressed and the
engine speed is reduced, the machine may move, so be particularly careful.
q
When climbing down a slope, select a gear speed which actuates the engine brake and press the
brake pedal, when necessary.
This pedal (4) is used to lower the engine speed or reduce the
travel speed.
Depress this pedal to reduce the speed when shifting between
forward and reverse or when stopping the machine.