Komatsu PC220LC -8 Operation & Maintenance Manual page 189

MACHINE OPERATIONS AND CONTROLS MACHINE OPERATIONS AND CONTROLS
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 position
(A). The preheating monitor lights up and engine preheating
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.
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.
When the turbo protect function is actuated, the engine speed is held at less than 1000 rpm, even if the fuel control
dial is operated.
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 length of time of actuating the
turbo protect function and the temperature of the engine coolant
is as shown in the table.
3 - 134
Coolant
temperature
Above 10 ° C (50 ° F)
10 to -10 ° C
Change 0 to 20
(50 to 14 ° F)
below -10 ° C (14 ° F)
OPERATION OPERATION
Turbo protect
time (sec.)
0
20