Komatsu PC290LC-6K, Operation & Maintenance Manual

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2-54
PC290-ENG
5. Carry out bucket and arm operation for 5 minutes at full stroke, alternat-
ing between bucket operation and arm operation at 30 second intervals.
If the swing lock switch
n
is set to the ON (actuated) position and
swing control lever
b
is operated at full stroke, oil temperature rise
can be increased earlier.
NOTICE
When the work equipment is retracted, take care that it does not
interfere with the machine body or ground.
6. After carrying out the warming-up operation, check that each gauge
and monitor lamp is in the following condition.
• Engine water temperature gauge
g
: Inside green range
• Fuel gauge
h
: Inside green range
• Engine water temperature monitor
i
: OUT
• Radiator water level monitor
j
: OUT
• Engine oil pressure monitor
k
: OUT
• Charge level monitor
l
: OUT
• Fuel level monitor
m
: OUT
• Air cleaner clogging monitor
n
: OUT
• Engine pre-heating monitor
o
: OUT
• Engine oil level monitor
p
: OUT
• Hydraulic oil level monitor
q
: OUT
7. Check that there is no abnormal exhaust gas colour, noise, or vibra-
tion. If any abnormality is found, repair it.
8. Press working mode switch
b
on the monitor panel until the lamp of
the mode to be used lights up.
12.3.2 IN COLD AREAS (AUTOMATIC WARMING-UP
OPERATION)
When starting the engine in cold areas, carry out the automatic
warming-up operation after starting the engine.
When the engine is started, if the engine water temperature is low
(below 30
o
C (86
o
F)), the warming-up operation is carried out automatically.
The automatic warming-up operation is cancelled if the engine water
temperature reaches the specified temperature (30
o
C (86
o
F)) or if the
warming-up operation is continued for 10 minutes. If the engine water
temperature or hydraulic oil temperature are low after the automatic
warming-up operation, warm the engine up further as follows.
NOTICE
•
When the hydraulic oil is at a low temperature, do not carry out
operations or move the levers suddenly. Always carry out the
warming-up operation. This will help to extend the machine life.
• Do not suddenly accelerate the engine before the warming-up
operation is completed.
Do not run the engine at low idling or high idling continuously
for more than 20 minutes. This will cause leakage of oil from the
turbocharger oil supply piping. If it is necessary to run the en-
gine at idling, apply a load from time to time or run the engine at
a mid-range speed.
1. Set fuel control dial
a
at the low idling (MIN) position and run the
engine for about 5 minutes without load.
12. OPERATION
H/O G/O F/O L/O B/O
j
i
n
q
k
l
m
h
g
o
p
BP00100