Replace Full-Flow Filter - Hitachi Zaxis 345USLC-6N Operator's Manual

Replace Full-Flow Filter

--- every 1000 hours
d
CAUTION: Hydraulic oil becomes hot and pressurized
during operation. Severe burns may result if skin
comes in contact with escaping hydraulic oil just after
operation. Wait for the oil to cool before starting any
maintenance work.
Replace
1. Park the machine on solid and level ground with the
bucket cylinder fully extended and the arm cylinder fully
retracted. Lower the bucket on the ground as shown to
the right. Stop the engine.
2. Before replacing element (5), be sure to bleed air
pressure from the hydraulic oil tank by pushing release
button on the hydraulic oil tank.
3. Loosen bolts (1) (6 used) to remove cover (2) and O-ring
(3). When removing cover (2), slowly remove cover (2)
while pressing cover (2) downward so that spring (4)
does not fly off.
4. Remove spring (4), and element (5).
5. Take extra care not to allow water or dust to enter the
filter case.
6. Replace element (5) and O-ring (3) with new one, and
install them to the hydraulic oil tank with spring (4). Be
careful not to damage element (5) and O-ring (3).
Broken element (5) is unusable.
7. Install cover (2) with bolts (1) (6 used).
Tightening Torque: 50 N·m (5 kgf·m)
8. Bleed air from the pump after replacing element (5).
(Refer to "Bleed Air from the Hydraulic System".)
If the machine is operated with air mixed in the hydraulic
circuit, damage to the pump may result.
IMPORTANT: Replace element (5) at the regular interval
to keep hydraulic oil clean and to extend the service
life of the hydraulic components.
MAINTENANCE
7-43
1 2
M1CC-07-002
3
4
5
M178-07-069