O-Ring Seal Joint - Hitachi ZW 100-G Workshop Manual

Piping Joint
Pipe connection (metal joint)
(Union Nut Wrench size 17, 19, 22, 27)
Metal (3) of adapter (1) and pipe (2) seals pressure
oil.
•
Precautions for use
Do not damage sealing surfaces (4) and (5) when
disassembling and assembling.
Tightening Torque
Use the specified tightening torque in the table below.
Wrench Size (mm)
N⋅m
Tightening
(kgf⋅m)
Torque
(lbf⋅ft)

O-Ring Seal Joint

O-ring (6) is installed against the end surface of
adapter (7) and seals pressure oil.
IMPORTANT:
•
Replace O-ring (6) with a new one when
reinstalling.
•
Before tightening union nut (9), confirm that
O-ring (6) is seated correctly in O-ring groove
(8). Tightening union nut (9) with O-ring (6)
displaced will damage O-ring (6), resulting in
oil leakage.
•
Do not damage O-ring groove (8) of adapter
(7) or sealing surface (10) on the hose side.
Damage to O-ring (6) may cause oil leakage.
•
If union nut (9) is found to be loose, causing
oil leakage, do not tighten it to stop the leak.
Instead, replace O-ring (6) with a new one,
then tighten union nut (9) after confirming that
O-ring (6) is securely seated in O-ring groove
(8).
GENERAL / Tightening
17 19 22
24.5 29.5 39
2.5 3 4
18 22 28.5
1
27
78
8.0
58
7
a - Joint Body
Wrench Size mm
Union Nut
19
22
27
32
36
41
46
W1-2-5
4 5 3
6 9
8 10
a
Tightening Torque
N⋅m (kgf⋅m, lbf⋅ft)
30 (3.0, 22)
70 (7.0, 51)
95 (9.5, 69)
140 (14, 100)
180 (18, 130)
210 (21, 155)
210 (21, 155)
2
M1M7-07-005
M104-07-033