TM 5-3805-280-24-1
Theory of Operation
The engine speed control components allows the operator
to choose engine speeds to match operating conditions
and to operate the engine as efficiently as possible.
Engine speeds from slow idle to fast idle in standard
mode are selected by the engine rpm dial (A) located in
the right console panel in cab. The E (economy) mode
and HP (high power) mode are selected by switches
located in the right console panel just above the engine
rpm dial. The auto idle mode is selected by a switch
located in the switch panel (B). Indicators in the monitor
9010
05
panel are lit to indicate when the E mode, HP mode, and
4
auto-idle mode switches are pushed to activate the
function.
AI=Auto Idle Mode Switch
E=Economy Mode Switch
HP=High Power Mode Switch
Turning the engine rpm dial or pushing the AI, E, or HP
mode switches sends an electrical signal to the engine
and pump controller (C). The controller senses the
electrical signal and then from the stored data sends an
electrical signal to the engine control motor (D). The
engine control motor regulates engine speed by a
push-pull cable attached to the fuel injection pump lever
located in the pump drive housing.
The engine speed sensor (P) (located in the pump drive
housing) counts the pump drive gear teeth as the gears
rotate. This senses actual engine speed. The sensing
signal is sent to the engine and pump controller (C) which
calculates engine speed.
CED,OUOE035,146
1911AUG982/2
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