Auto Auto
Inter-axle differential lock Inter-axle differential lock
Actuated Actuated
Cancel Cancel
Set the inter-axle differential lock switch to MANUAL before entering the dry sandy ground and actuate the inter-
axle differential lock.
Set it to AUTO when traveling on a normal ground.
HANDLE 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 revo-
lution, thus making it easier for an operator to use the retarder.
WARNING
• The ARAC system begins to function when the automatic retarder, accelerator control switch is in
ON position.
Check that automatic retarder, accelerator linked control 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 incli-
nation, load weight and selected gear speed.
In that case, use the retarder control lever and brake pedal to slow down to a safe 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.
• If some abnormalities occur in the ARAC system and the machine cannot be controlled securely,
the alarm buzzer sounds and the system is turned OFF to release ARAC. In that case, keep control
of the machine by using the retarder control lever and brake pedal, stop it in a safe place, and turn
the automatic retarder, accelerator linked control switch to OFF position.
• ARAC system does operate when the gear shift lever is in NEUTRAL position (N).
When ARAC operates, if the gear shift lever is set to NEUTRAL position (N), the retarder pilot lamp
goes out, and ARAC is released.
OPERATION MACHINE OPERATIONS AND CONTROLS
3-197
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