Komatsu D155A-6 Operation & Maintenance Manual page 171

OPERATION OPERATION
6. When the engine starts, release the key in starting switch (2).
The key will return automatically to the ON position (B).
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, return to the low idle (MIN) position of fuel control dial (1) and then carry out
the warming-up operation.
REMARK
Regardless of the ambient temperature, if the key in the starting switch (2) is turned from the OFF position to the
left, pre-heating pilot lamp (3) will light up and pre-heating will start. (Pre-heating continues while the starting
switch is being held to the left.)
For details of the pre-heating time, see the table in Step 5.
During the pre-heating operation, pre-heating pilot lamp (3) lights up to show that pre-heating is being carried out.
If the engine does not start with the above operation, wait for at least 2 minutes, and repeat the procedure in
Steps 3 and 4.
REMARK
The turbo protect function is a function to protect the turbocharger. It keeps the engine speed below 1000 rpm
for a set time after the engine is started even if the pedal is fully depressed.
The basic function acts to cancel the actuation of the turbo protect function when the engine oil pressure rises.
The settings for the maximum actuation time are as shown below. When the turbo protect function is actuated,
the engine speed does not change even when the fuel control dial is moved.
Coolant temperature
Above 10 ° C (50 ° F)
10 to -30 ° C (50 to -22 ° F)
below -30 ° C (-22 ° F)
3 - 120
Turbo protect time (sec.)
0
Change 0 to 20
20
OPERATION OPERATION