Hitachi ZAXIS 17U-2, Operator'S Manual

Page: 130 / 183

MAINTENANCE
7-27
Replace Full Flow Filter
--- every 500 hours (first time after 250 hours)
WARNING: Be sure to work only after oil tem-
perature is low or before operation. Failure to do
so may allow high temperature oil to spray, pos-
sibly causing severe burns.
1. Park the machine on a solid level surface. Position
the machine with the arm cylinder fully retracted and
the bucket cylinder fully extended. Lower the bucket
and blade to the ground. Stop the engine.
2. Before replacing the element, be sure to loosen the
hydraulic oil tank cap to release the air pressure from
the hydraulic oil tank.
3. Loosen four bolts (1) to remove cover (2) and O-ring
(3). While pressing cover (2) down, slowly remove
cover (2) so that spring (4) doesn’t fly out.
4. Remove spring (4), valve (5) and element (6).
5. Take care not to allow water and/or dirt to enter the
filter case.
6. Be careful not to damage element (6) and O-ring (3).
Don’t use a broken element.
7. Install new element (6), and O-ring (3) in the hydraulic
oil tank
8. Install cover (2) with four bolts (1).
Wrench Size : 17 mm
Tightening torque : 49 N
⋅
m (5 kgf
⋅
m, 36 lbt
⋅
ft)
9. After replacing the element, bleed air from the pump.
Check the oil level in the hydraulic oil tank. (Refer to
“Bleed Air from Hydraulic System.”) If the ma-
chine is operated without completely bleeding air from
the hydraulic system, damage to the pump may re-
sult.
10. Replace the element at the specified interval to keep
hydraulic oil clean and extend the service life of hy-
draulic components.
M1M7-05-024
M1MS-07-001
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