Hitachi ZAXIS 135US-5B Operator's Manual page 323

 Metal Face Seal Fittings
Tight contact between metal flares on adaptor (7) and metal
connector (8) of hose (5) prevents pressure oil leakage. This
type of fittings is used on smaller diameter joint.
Precautions for Use
Connect or disconnect fittings with care not to damage seat
surfaces (9 and 10).
Tightening Torque:
Tighten fittings to the torque values shown below.
Wrench size (mm)
N·m
Torque
(kgf·m)
 Bent Tube
Tighten bent tube (11) mounted on the control valve to the
torque values shown below.
Wrench size (mm)
N·m
Tightening
torque
(kgf·m)
MAINTENANCE
17 19 22
25 30 40
(2.5) (3) (4)
17, 19
35
(3.5)
7
27
80
(8)
7-49
9 8 10 5
11
MDCN-07-029
M202-07-051
11