Hitachi EX27U Operator's Manual page 134

EX50u
7. Remove five bolts (1), cover (2) and O-ring (3).
8. Pull rod (4) up to remove element (5) assembly.
NOTE: Remove the element and inspect for metal par-
ticles and debris in the bottom of the filter can.
Excessive amounts of brass and steel particles
can indicate a failed hydraulic pump, motor,
valve or an impending failure. A rubber type of
material can indicate cylinder packing failure.
9. Replace O-ring (3) and element (5) with new ones.
10. Install rod (4) and element (5) assembly. Be sure to
insert element (5) securely into pipe assembly (6).
11. Reinstall cover (2), aligning support (7) of cover (2)
with rod (4).
12. Reinstall five bolts (1) and retighten them to 49 N⋅m
(5 kgf⋅m, 36 lbt⋅ft).
IMPORTANT: If the hydraulic pump is not filled with oil,
it will be damaged when the engine is
started.
Purge air from the hydraulic pump.
(Refer to Bleed Air from the hydraulic system.)
Check the hydraulic oil tank gauge add oil if necessary.
MAINTENANCE
7
5
7-30
2 1
6
3
4
M588-07-066