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7.4.2
Hydraulic Fittings
7.4.2.1
O-ring Type
Refer to illustration and proceed as follows:
FITTING
SEAT
a. Inspect O-ring and seat for dirt or obvious
defects.
b. On angle fittings, back off the lock nut until
washer bottoms out at top of groove.
c. Hand tighten fitting until back up washer or
washer face (if straight fitting) bottoms on face
and O-ring is seated.
d. Position angle fittings by unscrewing no more
than one turn.
e. Tighten straight fittings to torque shown.
f.
Tighten angle fittings to torque shown in the
following table while holding body of fitting with a
wrench.
NUT SIZE
TORQUE
THD
ACROSS
VALUE*
SIZE
FLATS
(in.)
(in.)
lbf-ft
3/8
1/2
6
7/16
9/16
9
1/2
5/8
12
9/16
11/16
18
3/4
7/8
34
7/8
1
46
1-1/16
1-1/4
75
1-3/16
1-3/8
90
1-5/16
1-1/2
105
1-5/8
1-7/8
140
1-7/8
2-1/8
160
* The torque values shown are based on lubricated
connections as in reassembly.
Form 169017
MAINTENANCE/SERVICE
LOCKNUT
WASHER
O-RING
GROOVE
RECOMMENDED
TURNS TO
TIGHTEN (AFTER
FINGER
TIGHTENING)
N·m
Flats
Turns
8
2
1/3
12
2
1/3
16
2
1/3
24
2
1/3
46
2
1/3
62
1-1/2
1/4
102
1
1/6
122
1
1/6
142
3/4
1/8
190
3/4
1/8
217
1/2
1/12
7.4.2.2
Flare Type
Refer to illustration and proceed as follows:
FLARE
FLARESEAT
a. Check flare and flare seat for defects that might
cause leakage.
b. Align tube with fitting before tightening.
c. Lubricate connection and hand tighten swivel
nut until snug.
d. To prevent twisting the tube(s), use two
wrenches. Place one wrench on the connector
body and with the second, tighten the swivel nut
to the torque shown.
e.
NUT
TUBE
SIZE
SIZE
ACROSS
O.D.
FLATS
(in.)
3/16
1/4
5/16
3/8
11/16
1/2
5/8
3/4
1-1/4
7/8
1-3/8
* The torque values shown are based on
lubricated connections as in reassembly.
109
NUT
BODY
RECOMMENDED
TORQUE
VALUE*
(in.)
lbf-ft
N·m
7/16
6
8
9/16
9
12
5/8
12
16
18
24
7/8
34
46
1
46
62
75
102
90
122
Issue – June 2008
TURNS TO
TIGHTEN
(AFTER FINGER
TIGHTENING)
Flats
Turns
1
1/6
1
1/6
1
1/6
1
1/6
1
1/6
1
1/6
3/4
1/8
3/4
1/8
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