5-6
GROUP 3 AUTOMATIC DECELERATION SYSTEMGROUP 3 AUTOMATIC DECELERATION SYSTEM
Main pump
Pilot pump
Engine
ECM
CAN
Main control valve
MCU
Accel dial
Accel dial signal
Normal
CN-16
Emergency
CN-16A
CN-16B
Cluster
Auto idle switch signal
Work
pressure
Travel
pressure
Pressure signal
Auto idle
pilot lamp
4
When all of the work equipment control levers including swing and travel levers are at neutral for 4
seconds, MCU sends throttle command to ECM to reduce the engine speed to 1000
rpm
. If the
control levers are at neutral for 1 minute, MCU reduces the engine speed to 800 rpm. As the result of

21095MS05