INTRODUCTION 777 SERVICE MANUAL
1-22 Published 10-01-2012, Control # 045-08
When detecting a difference in the two signals, module
changes the current input to EFC actuator, causing the
actuator shaft to rotate in the appropriate direction to either
increase or decrease the fuel flow and engine speed and
power.
In addition to communicating with EFC module, the
transducer also provides an AC electronic signal to the PC.
The PC interrupts the incoming signal and provides engine
speed data for the scroll display. The PC will also limit travel
speed by maintaining maximum travel motor hydraulic
displacement when track movement is initiated below 1800
engine rpms and will resume the lower travel speed when
engine speed falls below 1500 rpm.
Activating engine start switch also provides power to ether
starting aid switch. In order to prime the ether injection
mechanism for assisting with crane startup, engine start
switch and ether switch must be depressed and held at the
same time to complete the circuit to ether start switch ES and
ether disable switch ED. Releasing ether switch after
approximately three seconds of priming, discharges the
ether into the engine air inlet manifold and disables the
injection mechanism.
FIGURE 1-13 continued
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