Replace Hst Charge Filter - Hitachi ZW140-6 Operator's Manual

Replace HST Charge Filter

--- every 500 hours
Replace
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WARNING: Hydraulic oil becomes hot and pressurized
during operation. Severe burns may result if
skin comes in contact with escaping hydraulic oil
immediately after operation. Wait for the oil to cool
before starting any maintenance work.
1. Park the machine following the same procedures as
described on page 7-7 for preparation of inspection/
maintenance work.
2. Install articulation lock bar to the front and rear of the
frame by following the procedures described on page
7-9.
3. Before replacing the filter element, be sure to relieve the
air pressure from the hydraulic oil tank by pressing air
bleed valve (1).
4. Remove the cover of left side step.
5. Rotate the hexagonal section on the bottom of case (2)
counterclockwise using a spanner to remove case (2)
from head cover (3).
6. While turning element (5), remove the element
downward.
7. Replace O-ring (4) with a new one.
8. Sufficiently seat O-ring (4) in the O-ring groove on head
cover (3).
9. Coat the seal surface of new element (5) with hydraulic
oil. While turning element (5), completely install element
(5) into head cover (3) using care not to damage the
element.
10. Take care never to allow water and/or dust to enter the
filter case.
11. Install case (2) into head cover (3) while rotating case (2)
clockwise.
Tightening torque: 39 N·m (4.0 kgf·m) (29 lbf·ft)
12. After replacing the filter, bleed air from the hydraulic
pump and check the oil level in the hydraulic oil tank.
(Refer to the descriptions for "Bleed air from the
hydraulic system" in item
If the machine is operated without bleeding the air
mixed in the hydraulic circuit, damage to the hydraulic
pump may result.
f
NOTE: Replace the element at the regular intervals to
maintain clean hydraulic oil and extend the service life of the
hydraulic components.
MAINTENANCE
.)
7-55
1
M4FC-07-025
3
2
MNDF-07-007
3
4
5
2
M4GB-07-050