Attachments, Options; Handling Automatic Retarder, Accelerator Control(Arac); Explanation Of Components - Komatsu ecot3 GALEO HM300-2 Operation And Maintenance Manual

HANDLING AUTOMATIC RETARDER, ACCELERATOR CONTROL(ARAC)

HANDLING AUTOMATIC RETARDER, ACCELERATOR
CONTROL(ARAC)
This is a system to automatically activate the retarder when an operator wants to use it on a downslope or slow down
on a flat hauling road. It enables the retarder to automatically function according to the present selected gear speed
and engine revolution, thus making it easier for an operator to use the retarder.
The ARAC system begins to function when the automatic retarder, accelerator control switch is in the ON position. Check that
this switch is turned on before running down on a slope.
The ARAC system may not assure thorough braking force to slow down, depending on a slope inclination, load weight and
selected gear speed. In that case, use the retarder control lever and brake pedal to slow down to a safety speed.
The tires may be locked when the dump truck is running on a slippery hauling road and the ARAC system is in service. If that
happens, stop using the ARAC system.
Should some anomaly happen on the ARAC system and disable an operator from secure control of the dump truck, the system
is put in the OFF condition and released, while the alarm buzzer sounds. In that case, keep control of the dump truck, using the
retarder control lever and brake pedal, bring the truck to a halt in a safe place and turn off the automatic retarder, accelerator
control switch.

EXPLANATION OF COMPONENTS

(1) Automatic retarder, accelerator control switch
(2) Retarder control lever
(3) Accelerator pedal
6 - 2
WARNING
(4)
(5)
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ATTACHMENTS, OPTIONS

Brake pedal
Retarder pilot lamp