Doosan DX140LC, Operation And Maintenance Manual

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OP000599 Inspection, Maintenance and Adjustment
4-56
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 97.
2. Set safety lever on "LOCK" position.
3. Shut down engine.
4. Release pressurized air from hydraulic tank by rotating
breather cap (1, Figure 100).
5. Drain hydraulic oil from tank into a container capable of
holding 147.8 liters (39 U.S. gal.). After draining tank,
install drain plug.
NOTE: Used filter and used oil should always be
disposed of according to local regulations.
6. Carefully remove bolts and cover (2, Figure 100) from top
of hydraulic oil tank. There is a spring (3) under the cover
that will force the cover up.
7. Remove spring (3, Figure 100) and strainer (5), by pulling
on rod (4).
8. Clean inside and outside of strainer. Replace strainer if it is
broken.
9. Position strainer (5, Figure 100) on boss portion of suction
pipe (6).
NOTE: Measurement "A" is 650 mm (25.59 in).
FG000356
Figure 97
FG009551
Figure 98
IMPORTANT
Be careful of squirting oil when removing drain plug.
HAOC411L
A
Figure 99