Komatsu PC1250-11 Original Instructions Manual page 223

OPERATION
6.
After the engine starts, wait for the engine oil pressure caution lamp to go out. Do not touch the control
levers or control pedal while the engine oil pressure caution lamp is lit.
NOTICE
If the engine oil pressure caution lamp does not go out
in 4 to 5 seconds, stop the engine immediately. Check
the oil level, oil leakage, etc. and take proper meas-
ures.
REMARK
White smoke may be discharged for a short time immedi-
ately after the engine is started or during the aftertreatment
devices regeneration in the cold season, but this is not a
failure.
METHOD FOR MANUAL PREHEATING WHEN STARTING ENGINE
Regardless of the ambient temperature, it is possible to start the engine preheating manually.
1.
Turn the key in starting switch (3) counterclockwise from OFF position (A). The preheating pilot lamp lights
up and preheating of the engine starts. (Preheating continues while the key in starting switch (3) is turned to
the left and held there.)
The preheating pilot lamp starts flashing approximately 30
seconds after preheating starts and then goes out in ap-
proximately 10 seconds.
2.
After the preheating pilot lamp goes out, turn the key of
starting switch (3) to START position (C). The engine will
start.
If the engine cannot be started with the above procedure, wait for approximately 2 minutes, then start again
from Step 1.
TURBOCHARGER PROTECTION FUNCTION
The turbo protect function protects the turbocharger by keeping the engine speed at approximately 1000 rpm or
less immediately after the engine is started.
• When the turbo protect function is actuated, the engine speed is held at approximately 1000 rpm or less,
regardless of the position of the fuel control dial.
• When the turbo protect function is actuated, the engine speed is held at approximately 1000 rpm or less,
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 actuation time of the turbo protect function is limited to 20 seconds.
MACHINE OPERATIONS AND CONTROLS
3-157