REMARK
• If the key of starting switch (2) is turned counterclockwise from OFF position, preheating pilot lamp lights up
and preheating is performed, regardless of the ambient temperature. (Preheating continues while starting
switch (2) is held counterclockwise.)
For the preheating time, see the table in step 7.
• During preheating, preheating pilot lamp keeps lighting up to notify that preheating is performed.
• If the engine does not start by the above operation, wait for approximately 2 minutes, and then repeat the
operations in steps 5 and 6.
• DEF system has function to heat and warm itself to prevent freezing of DEF.
DEF freezes at -11 °C. If it needs to be thawed after the engine is started, the engine is heated automatical-
ly to thaw frozen DEF. The devices do not operate until DEF is thawed, but this does not indicate any ab-
normality. When the temperature decreases and DEF may freeze while the machine is in operation, the
system is heated automatically to prevent freezing. If the temperature decreases so low that freezing can-
not be prevented, the devices stop automatically. However, this is not abnormal.
• When DEF freezes, it is automatically thawed. Never heat it. Harmful ammonia gas may be generated.
Turbo protect function
The turbo protect function protects the turbocharger by keeping the engine speed at approximately 1000 rpm or
less immediately after the engine is started.
When the turbo protect function and automatic warm-up function operate at the same time, the turbo protection
function is given priority.
• When the turbo protect function is actuated, the engine speed is held at 1,000 rpm rpm, even if the fuel
control dial is turned to a position of 1000 rpm or higher.
• When the turbo protect function is canceled, the engine speed is set to the speed for the position of the fuel
control dial.
• The relationship between the operating time of the turbo protect function and the engine coolant tempera-
ture is shown in the table.
Coolant temperature (°C)
Turbo protect time (sec.)
+10 °C or above 0
+10 to -30 °C Variable between 0 and 20
-30 °C or below 20
Automatic warm-up function
The automatic warm-up function increases the idle speed to 1200 rpm to increase the engine coolant tempera-
ture quickly during operation at low temperature.
When the turbo protect function and automatic warm-up function operate at the same time, the turbo protection
function is given priority.
• When the automatic warm-up function is actuated, the engine speed is held at 1200 rpm rpm, even if the
fuel control dial is turned to a position of 1200 rpm or lower.
However, if the fuel control dial is kept at High idle (MAX) position for 3 seconds or more, the automatic
warm-up function is canceled, and the engine speed can be decreased below 1200 rpm.
• The automatic warm-up function continues operation until the engine coolant temperature reaches 30 °C or
up to 10 minutes.
• If the decelerator pedal is depressed while the automatic warm-up function is in operation, the automatic
warm-up function is canceled and the engine speed decreases below 1200 rpm.
MACHINE OPERATIONS AND CONTROLS OPERATION
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