Hitachi ZX200-5G Workshop Manual page 61

Pipe 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).
SECTION 1 GENERAL
Group 2 Tightening
17 19 22 27
25 30 40 80
(2.5) (3) (4) (8)
(18) (22) (30) (59)
1
7
a - Joint Body
Wrench Size mm
Union Nut
19
22
27
32
36
41
50
W1-2-1-5
4 5 3
6 9
8 10
a
WDAA-01-02-011
Tightening Torque
N·m (kgf·m) (lbf·ft)
30 (3) (22)
70 (7) (52)
95 (9.5) (70)
140 (14) (103)
180 (18) (133)
200 (20) (148)
350 (35) (260)
2
M1M7-07-005