Komatsu PC2000-8 BACKHOE, Operation & Maintenance Manual, Page: 259 / 504

OPERATION
MACHINE OPERATIONS AND CONTROLS
3-193
Engine Warm Up 3
NOTICE
q
Do not accelerate the engine suddenly until the warm-
up operation has been completed.
q
Do not run the engine at low idling or high idling under
no load for more than 20 minutes. This will have an
adverse effect on the environment, and will also have
an adverse effect on the internal structure of the
engine. If it is necessary to run the engine at idling for
more than 20 minutes, apply a load from time to time
or run at a mid-range speed.
After the engine starts, do not start operating the machine immediately. First, carry out the following operations
and checks.
1. This machine is equipped with an automatic engine warm-up system, so if the engine water temperature is
below 30 °C after the engine is started, the engine warm-up operation starts automatically. When the engine
automatic warm-up operation starts, the engine speed is maintained at a speed higher than the normal low
idling speed.
If the engine water temperature goes above 30 °C or if the warm-up operation has been continued for more
than 10 minutes, the automatic warm-up operation is cancelled and the engine speed drops to the normal low
idling speed.
2. Check that engine coolant temperature monitor (1) dis-
plays the correct temperature.
If it displays low temperature, use the procedure in Step 3
to carry out additional warm up of the engine until the mon-
itor displays the correct temperature.
(A) Display when temperature is correct: Monitor back-
ground (C) is blue
(B) Display when temperature is low: Monitor background
(C) is white
3. Turn fuel control dial (2) to a point midway between low
idling (MIN) and full speed (MAX), run the engine under no
load at a mid-range speed until engine coolant temperature
monitor (1) displays the correct temperature.