Piping Joint; Union Joint - Hitachi ZW 100-G Workshop Manual

PIPING JOINT

IMPORTANT: The torque given in table below are
for general use only, however, a
different torque is given for a
specific
specified torque.

Union Joint

Metal sealing surfaces (4) and (5) of adapter (1) and
hose (2) fit together to seal pressure oil. Union joints
are used to join small-diameter lines.
IMPORTANT:
•
Do not over-tighten union nut (3). Excessive
force will be applied to metal sealing surfaces
(4) and (5), possibly cracking the adapter (1).
Tighten union nut (3) to the specifications.
•
Scratches or
surfaces (4) or (5) will cause oil leakage at the
joint. Take care not to damage them when
connecting / disconnecting.
GENERAL / Tightening
application. Use
other damage to
Description
30°male
37°female
NOTE: Tightening torque of 37
the
1
a - Joint Body
sealing
30°
b - Male Union Joint
Wrench Size
mm
Union Nut
17
19
22
27
32
36
41
17
19
22
27
32
36
41
to tightening torque of 37
W1-2-4
4 3 5
a
37°
b
c - Female Union Joint
Wrench Size Tightening Torque
mm
Hose Fittings N⋅m (kgf⋅m, lbf⋅ft)
17
19
22
27
32 140 (14, 100)
36 180 (18, 130)
41 210 (21, 155)
14
17
19
22
27 140 (14, 100)
32 180 (18, 130)
36 210 (21, 155)
° male coupling without union is similar
° female.
2
M202-07-051
c
W105-01-01-017
25 (2.5, 19)
30 (3.0, 22)
40 (4.0, 30)
80 (8.0, 59)
25 (2.5, 19)
30 (3.0, 22)
40 (4.0, 30)
80 (8.0, 59)