Doosan DX700LC Operation And Maintenance Manual page 151

Hydraulic System Warm-up
If a problem or abnormal operation occurs, immediately
shut down engine. Allow excavator to reach normal
operating temperature before starting work, especially in
cold weather.
The correct operating temperature of the hydraulic oil is 50° -
80°C (120° - 175°F). Make sure to follow the procedures listed
here for hydraulic fluid warm-up.
1. Run engine for approximately five minutes set at the
middle of the speed range, without a load.
2. Set safety lever (1, Figure 14) on "UNLOCK" position.
3. Slowly cycle boom, arm and bucket cylinders about five
times without a load to circulate the oil through the system.
Do this for five minutes.
4. Check for clearance and fully raise the front attachment.
Swing clockwise 3 revolutions. Swing counterclockwise 3
revolutions.
5. Travel forward and reverse at low speed for two
revolutions of the drive sprocket.
Operation
WARNING
Figure 13
1
Figure 14
Figure 15
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