Replace Hydraulic Tank Oil Filter - Hitachi ZW180 Operator's Manual

5

Replace Hydraulic Tank Oil Filter

--- every 1000 hours
WARNING: Hydraulic oil becomes hot and pressur-
ized during operation. Severe burns may result if skin
comes in contact with escaping hydraulic oil imme-
diately after operation. Wait for the oil to cool before
starting any maintenance work.
Especially when removing the filter, be aware that the
remaining oil in the filter may spill. Use extra care.
Replacement procedures
1. Park the machine on a solid level surface. Lower the
bucket to the ground. Stop the engine.
2. Turn the parking brake switch ON. Press the neutral lever
lock to the LOCK position.
3. Lock the front and rear frames with the articulation lock
bar.
4. Clean the vicinity around cover plate (1).
5. Arrange a container and workshop towels to receive the
spilled oil and the element.
6. Loosen bolts (2) (6 used) to remove cover (1) and O-ring
(3). When removing cover (1), slowly remove the cover
while pressing the cover downward so that spring (4)
does not fly off.
7. Remove spring (4), valve (5) and element (6).
8. Replace element (6) and O-ring (3) with new ones. Install
new element and O-ring in the hydraulic oil tank. Before
installing element (6), make sure that rubber (7) is pres-
ent.
9. Install cover (1) with bolts (2) (6 used).
Tightening torque: 49.9 N•m (5.1 kgf•m)
10. After replacing the return filter element, bleed air from
the hydraulic pump and check the oil level in the hy-
draulic oil tank. [Refer to the descriptions for "Bleed air
from the hydraulic system" in item 2 .] If the machine is
operated without bleeding the air mixed in the hydraulic
circuit, damage to the hydraulic pump may result.
NOTE: Replace the element at the regular intervals to main-
tain the hydraulic oil clean and extend the service life-
time of the hydraulic components.
MAINTENANCE
7-47
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M4GB-07-044
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M4GB-07-051
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M4GB-07-052