Replace Hydraulic Tank Oil Filter - Hitachi ZAXIS 70 Operator's Manual

Replace Hydraulic Tank Oil Filter

(ZAXIS70, 70LC, 80SB, 80SBLC, 85US)
--- 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.
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 posi-
tion.
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), valve (5) and element (6).
NOTE: Remove the element and inspect for metal par-
ticles 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 impending failure. A rubber type of
material can indicate cylinder packing failure.
10. Discard element (6) and O-ring (3).
11. Install a new element (6), valve (5) and spring (4).
12. Install filter cover (2) with a new O-ring (3).
13. Install and tighten bolts (1) to 50 N m (5.1 kgf m, 36
lbf ft).
MAINTENANCE
7-32
M1CC-07-002
4 2 3 1
5
M175-07-035