Operation and maintenance manual

DX140R/DX140LCRInspection, Maintenance and Adjustment
4-60
Hydraulic Oil Exchange and Suction
Strainer Cleaning
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. Park machine on firm and level ground. Swing upper
structure parallel to tracks. Lower boom and position
bucket on ground as shown in Figure 109.
2. Move safety lever to "LOCK" position.
3. Stop engine.
4. Release pressurized air from hydraulic tank by rotating
breathe
r cap (1, Figure 112).
Figure 108
ARO1760L
WARNING
AVOID DEATH OR SERIOUS INJURY
The hydraulic oil will be hot after normal machine
operat
ion. Allow the system to cool before attempting to
service any of the hydraulic components.
The hydraulic tank is pressurized. Loosen the breather cap
to allow t
he 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.
EX1300561
Figure 109