3-28
［
］
LO
H
I
1
1.
Run the engine for about 5 minutes with no load at
middle speed by setting engine throttle (1) to the
middle between the low idle and the full speed
positions.
2.
When the reading of engine coolant temperature
meter (2) rises to normal range (C), engine
warming-up is completed.
3.6.2
WARMING-UP HYDRAULIC OIL
Perform warming-up of the hydraulic oil after engine warming-up is completed.
B
A
1.
Push pilot control lock lever (1) down and forward
and set it at the "UNLOCKED" position.
2.
Raise the boom to the height where the bucket can
be operated.
C
C
3.
Move the right control lever slowly toward bucket
digging side (C) to the stroke end position and
perform relief operation until the reading of hydraulic
oil temperature meter (3) rises to normal range (a).
4.
After that, slowly extend and retract each cylinder
several times.
5.
Also perform swing and travel operations slowly to
circulate the warm hydraulic oil in all operation
circuits.
When the reading of hydraulic oil temperature meter
(3) is in low temperature range (b), repeat the
above-mentioned procedure until it rises to normal
range (a).
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