3.7
WARMING-UP
3.7.1
ENGINE WARMING-UP
Avoid a dash acceleration of the engine before the warming-up is finished.
Do not continuously idle the engine for 20 minutes or longer with no load. It may cause a failure
and trouble to the engine.
Allow the engine to run for 5 minutes with no load at middle speed by setting the engine throttle
lever to the middle between the low and the high idle positions.
3.7.2
WARMING UP HYDRAULIC OIL
The proper hydraulic oil temperature for this machine is about 50 to 80 degrees C. Warm up the
hydraulic oil to 20 degrees C at minimum before starting the work if the work in a low temperature is
unavoidable.
Middle speed position
1.
Move engine throttle lever (1) to the "middle speed position" to accelerate the engine speed.
2.
Make sure that the pilot control shut-off lever is set to the "UNLOCKED" position.
3.
Raise the boom to make a sufficient ground clearance.
4.
Fully move right control lever (2) to the bucket digging or dumping side and hold the position for
about 5 minutes.
5.
At the end of warming-up of the hydraulic oil, slowly extend and retract the rod of each cylinder
several times, and swing and travel the machine lightly.
After warming up the engine, it is also necessary to warm up the hydraulic oil for the best
performance.
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3. MACHINE OPERATION
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