Clean Pilot Oil Filter (Steering Circuit) - Hitachi ZW 310-6 Operator's Manual

Clean Pilot Oil Filter (Steering Circuit)

--- every 2000 hours
Replace
d
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 7-8 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
7-10.
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. Place a suitable container under reducing valve (2).
5. Remove plug (4) with O-ring (5).
d
CAUTION: Wear goggles or safety glasses when using
compressed air [less than 0.2 MPa (2 kgf/cm
6. Remove filter element (3) from reducing valve (2) and
clean it by applying air or cleaning solution from the oil
flow outlet side.
7. Install filter element (3), O-ring (5) and tighten plug (4).
8. After cleaning 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: Clean the element at the regular intervals to maintain
clean hydraulic oil and extend the service life of the hydraulic
components.
MAINTENANCE
)].
2
.)
7-56
2
3
5
4
Oil Flow
90Z7-38511-31770
90Z7-7-37
90Z7B-7-51-2