BELT-SERPENTINE 3802622 - Caterpillar

Mode I
The AEC switch is off.
The switch for manual low idle is not activated.
The setting of the engine speed dial is between 5 and 10.The electronic controller automatically reduces engine speed by 100 rpm after there has been no hydraulic demand for approximately three seconds.Mode II
The AEC switch is on.
The switch for manual low idle is not activated.
The setting of the engine speed dial is between 5 and 10.The AEC system in the electronic controller will automatically reduce the engine rpm to approximately 1300 rpm after there has been no hydraulic demand for approximately three seconds.Mode III
The AEC switch is on or off.
The switch for manual low idle is activated.
The setting of the engine speed dial is between 3 and 10.The switch for manual low idle is in the right control lever. Whenever the switch for manual low idle is activated, the engine speed is reduced to approximately 950 rpm. Pressing the switch again will allow the engine speed to return to the setting of the engine speed dial. The setting of the engine speed dial is approximately 1300 rpm (Mode II) if the AEC switch is on and there is no hydraulic demand.
Illustration 1 g00101262
Automatic Engine Speed Control Switch (AEC Switch) - The Automatic Engine Speed Control switch and indicator (1) are activated when the engine start switch is turned to the ON position. When you press the AEC switch, the function of the AEC switch changes from ON to OFF, and vice versa.
Illustration 2 g00290957
Switch for Manual Low Idle - This switch reduces the engine speed to approximately 950 rpm. This reduction occurs regardless of the setting of the engine speed dial. This reduction also occurs from a setting of 1300 rpm (Mode II) on the AEC. If the switch for manual low idle is pressed again, the engine speed will return to the setting of the engine speed dial or to the setting of 1300 rpm (Mode II) on the AEC. Hydraulic demand is a determining factor for the setting.