SDEC D Series - Operation and Control of Engine Brake

Operation and Maintenance Manual SC9DF Electronically Controlled Diesel Engine for Agricultural Equipment
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－sudden change of oil pressure or coolant temperature
－fuel consumption increases
Warning: the diesel engine will be damaged in case of running at overspeed (a speed exceeds the
maximum value under empty load).
In order to avoid over-speed, the gear box and brake shall be used to control the speeds of vehicle and diesel engine
when the vehicle is driving down the slope.
3.3 Operation and control of engine brake
Some of SC9DF diesel engines are equipped with in-cylinder braking system, which can be used to reduce load on
the vehicle braking system effectively, so that you can decrease and control the vehicle speed without pressing down
the accelerator pedal, especially when driving down a slope, which can reduce braking load and avoid overheating of
the breaking drum to ensure driving and life safety, as well to reduce vehicle running and maintenance costs.
The braking system can provide "High" or "Low" braking capacity, which can be controlled by selecting the switch
("OFF", "LOW", "HIGH"). The system must meet the following three conditions during operation:
1） The switch is in ON position.
2） The clutch is in OFF position.
3） Fuel shut-off instruction exists.
That's to say, when driving, the brake switch is in the ON position and the clutch is in the OFF position; the braking
system will operate automatically as long as you release the accelerator pedal; when you step down the accelerator
pedal again, the braking system will stop working automatically; therefore, the system can help you decrease the
vehicle speed easily.
△Caution: The following principles shall be followed during activation of the brake:
1) Make sure the engine has been warmed up before activating the brake. Make sure to shift the switch from
LOW to HIGH.
2) Prohibit activating the brake during driving on wet road; otherwise, the vehicle will skid and be out of
control.