Method Of Operation - Komatsu ecot3 GALEO HM300-2 Operation And Maintenance Manual

ATTACHMENTS, OPTIONS
AUTOMATIC RETARDER, ACCELERATOR CONTROL SWITCH
This switch (1) is used to turn on and off the ARAC system.
(A): The ARAC system begins to function when a travel speed is
over 7 km/h and the accelerator pedal is released, and the
retarder pilot lamp lights on. (In a lower range of engine
revolution, the retarder pilot lamp may not light on even though
the ARAC system is in service.)
(B): The ARAC system does not function.
RETARDER CONTROL LEVER
This lever (2) activates the retarder even while the ARAC system is in service.
REMARK
When the ARAC system is in service, the retarder control lever has some play. It does not mean that the retarder
does not work, but that the ARAC system is in service.
ACCELERATOR PEDAL
The ARAC system functions only while accelerator pedal (3) is released.
BRAKE PEDAL
This pedal (4) can activate the wheel brakes even while the ARAC system is in service.
RETARDER PILOT LAMP
This lamp (5) lights on when the ARAC system begins to function and when the retarder is operated with the retarder
control lever.

METHOD OF OPERATION

ACTUATION OF ARAC SYSTEM
The ARAC system begins to function when the automatic retarder, accelerator control switch is turned to the ON
position.
When the automatic retarder, accelerator control switch is turned to the ON position, the retarder automatically
works according to the present gear speed selected and engine revolution.
If the brake pedal is depressed while the ARAC system is in service, the system stops functioning, accelerating the
truck's travel speed.
If the brake pedal is depressed, or the retarder control lever is used, while the ARAC system is in service, then the
dump truck can be slowed down or brought to a halt just as in normal braking operation.
HANDLING AUTOMATIC RETARDER, ACCELERATOR CONTROL(ARAC)
https://www.besttruckmanuals.com/
6 - 3