Hitachi ZAXIS 30U-5N Operator's Manual page 222

6. Replace O-ring (3) and element (6) with new ones. Be
careful not to damage element (6) and O-ring (3).
Broken element (6) is unusable.
7. Install element (6), valve (5), spring (4) and O-ring (3).
8. Install cover (2) with bolts (1) (4 used).
Tightening Torque:
ZX30U-5N, 35U-5N, 50U-5N: 10 N·m (1 kgf·m, 7.4 lbf·ft)
ZX60USB-5N:
9. Bleed air from the hydraulic system and check the
hydraulic oil level after replacing the element.
(Refer to the descriptions for "Bleed Air from Hydraulic
System")
If the machine is operated with air mixed in the hydraulic
circuit, damage to the pump may result.
f
NOTE: Replace element (6) at the regular interval to keep
hydraulic oil clean and to extend the service life of the
hydraulic components.
MAINTENANCE
50 N·m (5 kgf·m, 37 lbf·ft)
7-42
1 2 3
4
5
6
MADB-07-017
MADB-07-004