OPERATING THE MACHINE
5-5
Warming-up Operation
In cold weather, warm up the machine until coolant and hy-
draulic oil temperature increases to the appropriate operat-
ing temperature.
IMPORTANT: The appropriate hydraulic oil operating tem-
perature on this machine is 50 to 80 °C.
Hydraulic components may be seriously
damaged if the machine is operated with
low temperature hydraulic oil.
In case warming up the machine by relieving
the hydraulic system, continuously relieve
the relief valve for 10 to 15 seconds while
taking a pause for 5 to 10 seconds.
1. Run the engine with engine control dial (1) turned to the
slow idle position.
Do not operate the machine until the needle of coolant
temperature gauge (2) starts swinging.
2. After the needle of coolant temperature gauge (2) starts
swinging, turn engine control dial (1) to approx. medium
position.
3. Operate the boom, arm and bucket cylinders slowly to
each stroke end several times.
4. Operate the travel and swing functions slowly to allow
hydraulic oil to circulate through the systems.
5. Warming up operation ends after the above operation is
completed.
NOTE: During cold weather season, the warm-up operation
system automatically operates so that the engine
speed increases for a moment even though engine
control dial (1) is in the slow idle position.
M1U1-01-033
1
M1U1-01-004
Slow Idle
M1U1-03-006
2
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