Operation and Maintenance Manual SC9DF Electronically Controlled Diesel Engine for Agricultural Equipment
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3) Suitable brake gears shall be chosen for different road conditions to ensure that enough deceleration
capability will be provided for the vehicle to run at a suitable speed: the braking capability is better when
the engine is operating at a high speed and transmission is at lower gear, but the over-speed should be
avoided (it is recommended to choose the same gear when driving up and down a slope).
4) Timely choose suitable brake gears according to changed road condition. If the vehicle skids when the
brake system works, deactivate the brake system until the road condition has been improved. When
reactivating the brake, the same sequence from "Low" to "High" shall also be followed.
3.4 Stopping
After full-load operation and before shutdown, gradually reduce the engine speed and load, and run the engine
for 3~5 minutes at the idle to let turbocharger speed fall considerably and let the engine cool down gradually and
evenly so as to protect the turbocharger and engine.
Turn the start key switch to the OFF position.
Unless it is necessary, no emergency stop should be done while running under high loads, or serious failures will
occur due to overheating.
3.5 Engine working range
△Caution: The engine can operate under the transitional working conditions at a speed above the maximum
torque speed, which is in line with recommended strategy for economical running. If the vehicle is running
with full accelerator at a speed below the maximum torque speed for a long time, this will shorten the engine
service life, leading to overhaul or causing serious damage to the engine, which is treated as an abuse
behavior.
△Caution: The engine will be operating at a speed below the maximum torque speed during shifting gears.
This is due to different transmission ratios among transmission gears. However full- accelerator running at a
speed below the maximum torque speed shall not be longer than 1 min.
△Caution: The engine will be damaged seriously if its speed exceeds 2,500 RPM. When sliding from the
steep slope, control the equipment and diesel engine speeds with combination of the transmission and
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