Hitachi EX27U Operator's Manual page 136

11. Rotate the hexagon on filter case (9) counterclock-
wise using a tool such as a wrench to remove filter
case (9) from filter head (7).
12. While rotating filter element (10), pull to remove filter
element (10) downward.
13. Replace O-ring (11) with a new one.
14. Completely seat O-ring (11) into the O-ring groove on
filter head (7).
15. Coat the seal on new filter element (10) with clean
hydraulic oil. Completely install filter element (10) into
filter head (7) while rotating filter element (10) taking
care not to damage the filter element.
16. Take care so that dust and/or water never enter into
the filter case.
17. Install filter case (9) into filter head (7) while rotating
clockwise.
Tightening Torque: 25 to 34 N⋅m (2.5 to 3.5 kgf⋅m),
18.0 to 25.5 lbf⋅ft)
18. After replacing the filter element, bleed any remaining
air from the hydraulic circuit while running the engine
at a slow speed for approx. 3 minutes.
19. Install cover (6) along the fuel filler port.
20. Install rubber (4) and fuel filler cap (5).
21. Secure cover (6) with bolts (1) (4 used).
22. Check the oil level in the hydraulic oil tank. Refill with
hydraulic oil as necessary.
MAINTENANCE
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1
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9
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M503-07-031