Komatsu PC450-8 Operation & Maintenance Manual page 196

MACHINE OPERATIONS AND CONTROLS
6. Even if the engine starts, wait for the engine oil pressure
monitor to go out. Do not touch the control levers or con-
trol pedal while the engine oil pressure monitor is lighted
up.
NOTICE
If the engine oil pressure monitor does not go out even
after 4 to 5 seconds have passed, stop the engine immedi-
ately. Check the oil level, check for leakage of oil, and take
the necessary action.
REMARK
Regardless of the ambient temperature, it is possible to start
the engine preheating manually.
1. Turn the key in starting switch (3) to the left from OFF posi-
tion (A). The preheating monitor lights up and engine preheat-
ing starts.
(Preheating continues while the key in starting switch (3) is
held at the left position.)
2. The preheating monitor starts lighting about 30 seconds after
preheating starts and then goes off in about 10 seconds.
3. After the preheating monitor goes off, turn the key in starting
switch (3) to START position (C). The engine will start.
If the engine cannot be started with the above procedure, wait
for at least two minutes, then start again from Step 1.
Turbo protect function
The turbo protect function is a function to protect the turbocharger by keeping the engine speed at less than 1000
rpm immediately after the engine is started.
q
When the turbo protect function is actuated, the engine speed is held at less than 1000 rpm, regardless of the
position of the fuel control dial.
q
When the turbo protect function is actuated, the engine speed is held at less than 1000 rpm, even if the fuel con-
trol dial is operated.
q
When the turbo protect function is canceled, the engine speed is set to the speed for the position of the fuel con-
trol dial.
q
The relationship between the length of time of actuating the
turbo protect function and the temperature of the engine
coolant is as shown in the table.
3-130
Coolant Turbo protect
temperature time (sec.)
Above 10°C
10 to -10°C Change 0 to 20
below -10°C
OPERATION
0
20