Doosan DX700LC Operation And Maintenance Manual page 243

Hydraulic Oil Exchange and Suction
Strainer Cleaning
The hydraulic oil will be hot after normal machine
operation. Allow the system to cool before attempting to
service any of the hydraulic components.
The hydraulic tank is pressurized. Lift the breather cap to
allow the pressurized air to vent. After the pressure has
been released, it is safe to remove either the fill cap or
service covers.
IMPORTANT
Make sure to clean any dirt or water from the top of the
hydraulic tank, especially around the fill port and filter ports.
Hydraulic oil change interval is 2,000 hours, only when
DOOSAN Genuine Oil is used. If another brand of oil is
used, guaranteed change interval is 1,000 hours.
NOTE:
Based on the type of excavating being completed,
the working conditions (extremely hot or dusty) and
the extra front end attachments being used (hydraulic
breaker, etc.), the hydraulic fluid will need to be
changed more frequently.
1. Position the machine on firm, level ground. Swing upper
structure perpendicular (90°) to tracks. Lower boom and
position bucket on ground as shown in Figure 101.
2. Set safety lever on "LOCK" position.
3. Shut down engine.
4. Release pressurized air from hydraulic tank by lifting
breather cap (1, Figure 104).
Inspection, Maintenance and Adjustment
WARNING
Figure 100
Figure 101
ARO1760L
FG015805
OP001123
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