Replace Hydraulic Tank Oil Filter - Hitachi 120-3 class Operator's Manual

4

Replace Hydraulic Tank Oil Filter

--- every 1000 hours
1. Park the machine on a level surface.
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. Stop the engine. Remove the key from the key switch.
6. Pull the pilot control shut-off lever to the LOCK position.
CAUTION: The hydraulic oil tank is pressurized. Push
the pressure release button on the air breather before
removing the air breather.
7. Push the pressure release button on the hydraulic oil tank
to release pressure.
NOTE: There is spring tension under the cover. Hold down
the cover when removing last two bolts.
8. Hold down filter cover (2) against light spring load when
removing the last two bolts (1). Remove filter cover (2).
9. Remove spring (4), and element (5).
NOTE: Remove the element and inspect for metal particles
and debris in the bottom of the filter can. Excessive
amounts of brass and steel particles can indicate a
failed hydraulic pump, motor, valve or an impend-
ing failure. A rubber type of material can indicate
cylinder packing failure.
10. Discard element (5) and O-ring (3).
11. Install a new element (5) and spring (4).
12. Install filter cover (2) with a new O-ring (3).
13. Install and tighten bolts (1) to 49 N•m (5 kgf•m, 36 lbf•ft).
MAINTENANCE
7-34
1 2
SA-039
3
4
5
M178-07-069