Komatsu D475A-5E0 Operation & Maintenance Manual page 174

OPERATION
11. 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 9.
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 and prelube, wait for 2 minutes, then repeat starting procedure from
step 2.
If it is left for more than 60 seconds in same condition as step 5, speed range display (4) will return to the condition
in step 3.
As shown below, if the operation is not normal, and the adjustment mode on the monitor is used to turn the
prelube OFF, it is possible to start the engine. In emergencies, see the method of use for the adjustment mode,
move the machine to a safe place, then contact your Komatsu distributor.
Problem
Engine does not start
After the prelube operation, it returns
again to the Prelube needed position
Speed range display
PE
(Flashes)
Po
(Flashes)
Main causes
Disconnected oil pressure switch
Failure in starter motor
Failure in starter motor relay
Does not reach specified oil
pressure in 60 seconds
OPERATION
3 - 121