SHAFT KT-PUMP 5624044 - Caterpillar

Illustration 1 g01208518
Automatic Engine Speed Control Switch (AEC Switch) - The Automatic Engine Speed Control is activated when the engine start switch is turned to the ON position. Press the top of the AEC switch in order to activate the first stage AEC and the second stage AEC. Press the bottom of the AEC switch in order to turn off the second stage AEC. The operator can choose from three possible modes for automatic engine speed control. Refer to Table 1 for more details.
Illustration 2 g00859027
The switch for manual low idle is on the right joystick.Manual Low Idle - The manual low idle allows the operator to easily reduce the rpm without touching the engine speed dial. Activate the manual low idle in order to reduce the engine speed to the second setting of the engine speed dial. Pressing the switch again will allow the engine speed to return to the original setting of the engine speed dial.
Table 1
AEC Mode     Position of AEC Switch     Setting of Engine Speed Dial     Position of Manual Low Idle Switch     Description of Mode    
First stage     OFF     5 to 10     OFF     The electronic controller automatically reduces engine speed by 100 rpm after there has been no hydraulic demand for approximately three seconds.    
Second stage     ON     5 to 10     OFF     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. The electronic controller will automatically reduce the engine speed by 100 rpm after light load condition is continued for approximately ten seconds.    
Manual low Idle     ON or OFF     3 to 10     ON     The engine speed is reduced to the second setting of the engine speed dial.