Hitachi ZAXIS 135US-5B Operator's Manual page 317

Procedures:
1. Park the machine on solid and level ground with the
bucket cylinder fully extended and the arm cylinder fully
retracted. Lower the bucket on the ground as shown to
the right. Stop the engine.
2. Before replacing element (5), be sure to bleed air
pressure from the hydraulic oil tank by pressing the air
bleed valve on the hydraulic oil tank.
3. Loosen bolts (1) (6 used) to remove cover (2) and O-ring
(3).When removing cover (2), slowly remove the cover
while pressing the cover downward so that spring (4)
does not fly off.
4. Remove spring (4), and element (5).
5. When installing new element (5) into the hydraulic oil
tank, replace O-ring (3) with a new one at the same time.
6. Install cover (2) with bolts (1) (6 used).
Tightening Torque: 50 N·m (5 kgf·m)
MAINTENANCE
7-43
4 2
1
3
5
1
2
MDCN-07-024
MDCN-07-023