Method For Operations And Checks After Starting Engine - Komatsu PC290LC-11 Operation & Maintenance Manual

MACHINE OPERATIONS AND CONTROLS

METHOD FOR OPERATIONS AND CHECKS AFTER STARTING ENGINE

k k
• If there has been any emergency stop, abnormal ac-
tuation or trouble, turn the starting switch key to OFF
position.
• Do not perform operations nor operate the levers or
pedal abruptly while the hydraulic oil is at low temper-
ature. Always perform the warm-up operation for the
hydraulic equipment until the hydraulic oil tempera-
ture caution lamp displays the correct temperature.
When the hydraulic oil temperature is low, the low
temperature display shown in the figure is given.
• Display (A) when temperature is correct: Caution
lamp background (C) is blue.
• Display (B) when temperature is low: Caution lamp
background (C) is white.
• If the warm-up operation for the hydraulic equipment
is not performed thoroughly, and the machine is
moved, the reaction of the machine to the operation of
the control levers and pedals will be slow and the
movement of the machine may not be what the opera-
tor intended. Particularly in a cold weather, be sure the
warm-up operation is completed.
• Keep away from the exhaust pipe while the engine is
running and immediately after stopping the engine.
Keep combustible materials away from the exhaust
pipe outlet.
There are 2 types of warm-up operation: warm-up of the engine and warm-up of the hydraulic equipment. In
addition, depending on the environment, the method of performing the warm-up operation may differ, so perform
the warm-up operation according to the descriptions given in the appropriate section.
The hydraulic equipment is not warmed by simply performing engine warm-up operation. Perform the warm-up
operations for the hydraulic equipment and engine separately. Warm-up of the hydraulic equipment thoroughly
ensures that the hydraulic oil is warmed up and that warm hydraulic oil circulates in all the control circuits.
METHOD FOR CHECKING STARTING CONDITION AND UNUSUAL NOISE OF
ENGINE
• When starting the engine, check that the engine causes no abnormal noise and that it starts up easily and
smoothly.
• Check that there is no abnormal noise when the engine is idling or when the engine speed rises slightly.
When there is an abnormal noise at the engine startup and if that condition continues, the engine may be dam-
aged. In that case, ask your Komatsu distributor to check the engine as soon as possible.
METHOD FOR CHECKING LOW-SPEED RUN AND ACCELERATION OF ENGINE
• Perform these checks in a safe place, watching out for danger in the surroundings.
• When the engine performs very badly at low idle and in the acceleration and if that condition contin-
ues, it may damage the engine or confuse the operator's sense of driving or lower the braking effi-
ciency, and as a result lead to an unexpected accident. In that case, ask your Komatsu distributor to
check the engine as soon as possible.
3-172
WARNING
k k
CAUTION
OPERATION