Hitachi EX1900-5 Operator's Manual page 182

Drain Hydraulic Oil Tank Sump
--- every 250 hours
IMPORTANT: Never run the engine without oil in hy-
draulic oil tank.
1. Park the machine on a level surface with the upper-
structure rotated 90° for easier access.
2. Lower the bucket to the ground.
3. Turn the auto-idle switch off.
IMPORTANT: The turbocharger may be damaged if the
engine is not properly shut down.
4. Run the engine at slow idle speed without load for five
minutes.
5. Turn the key switch OFF. Remove the key from the
key switch.
6. Pull the pilot control shut-off lever to the LOCK posi-
tion.
CAUTION: Keep body and face away from cap (1).
Turn cap (1) slowly and remove the cap only after
releasing the internal pressure completely.
7. Insert the wrench as shown and turn the wrench
clockwise and hold the wrench.
8. Turn cap (1) counterclockwise about 30°, at which
point stop cap (1) to release the air.
9. Turn cap (1) further and remove cap (1).
10. Align the projected part of cap (1) with the projected
part of the case and install cap (1).
CAUTION: Do not loosen the drain cock until oil
is cool. Hydraulic oil may be hot, potentially caus-
ing serious injury.
11. After oil is cool, open drain cock (2) to drain water and
sediment.
12. After draining water and sediment, tighten drain cock
(2) securely.
MAINTENANCE
7-50
Wrench 4 mm
2
1
M18C-07-023
Cap (1)
Arrow
Projection
Case Assembly
Projection
Side Hole
M110-07-022
2
M18C-07-024