Komatsu D475A-5E0 Operation & Maintenance Manual page 170

OPERATION
REMARK
Immediately after starting the engine, run at idle. While running the engine, release the decelerator pedal and do
not operate the work equipment.
Guideline for idle time
Cold weather: At least 15 seconds
1st start after changing engine oil or engine oil filter: 20 seconds
7. When the engine rotation stabilizes, set fuel control dial (1) to Low idle (MIN) position, then perform the
warming-up operation.
REMARK
Regardless of the ambient temperature, if the key in starting switch (2) is turned from OFF position to the left,
engine pre-heating pilot lamp (3) will light and pre-heating will start. (Pre-heating continues while the starting
switch is being held to the left.)
For details of pre-heating times, see the table in step 5.
During the pre-heating operation, engine pre-heating pilot lamp (3) lights to show that preheating is being
performed.
Pre-heating is completed within 45 seconds.
If the engine does not start after pre-heating, wait for 2 minutes, then repeat starting procedure from step 2.
The actuation time for the turbo protect function and the relationship with the engine coolant temperature are as
shown below. If the fuel control dial is operated within the time shown below, the engine speed will not change.
Turbo protect function
The turbo protect function is a function to protect the turbocharger
by keeping the engine speed at less than 1,000 rpm immediately
after the engine is started.
In cold weather, the turbo protect function is actuated, so the
engine speed is kept at 1,000 rpm or below for several seconds.
After that, it becomes the speed set by the position of the fuel
control dial.
When the turbo protect function is actuated, the engine speed is
held at less than 1,000 rpm, regardless of the position of the fuel
control dial.
Coolant temperature
Above 10 ° C (50 ° F)
10 to -10 ° C (50 to 14 ° F)
below -10 ° C (14 ° F)
OPERATION
Turbo protect
time (sec.)
0
Change 0 to 25
25
3 - 117