34
TIGHTENING FLARE TYPE TUBE FITTINGS *
7.3 HYDRAULIC FITTING TORQUE
1. Check flare and flare seat for defects
that might cause leakage.
2. Align tube with fitting before tightening.
3. Lubricate connection and hand tighten
swivel nut until snug.
4. 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 toque
shown.
* The torque values shown are based on
lubricated connections as in reassem-
bly.
Recommended
Turns To Tighten
(After Finger
Tightening)
(Flats) (Turn)
Tube
Size
OD
(in.)
Nut Size
Across
Flats
(in.)
Torque
Value*
(N.m) (lb-ft)
6
9
12
18
34
46
75
90
7/16
9/16
5/8
11/16
7/8
1
1-1/4
1-3/8
3/16
1/4
5/16
3/8
1/2
5/8
3/4
7/8
8
12
16
24
46
62
102
122
1
1
1
1
1
1
3/4
3/4
1/6
1/6
1/6
1/6
1/6
1/6
1/8
1/8
TIGHTENING O-RING FITTINGS *
1. Inspect O-ring and seat for dirt or
obvious defects.
2. On angle fittings, back the lock nut
off until washer bottoms out at top of
groove.
3. Hand tighten fitting until back-up
washer or washer face (if straight
fitting) bottoms on face and O-ring is
seated.
4. Position angle fittings by unscrewing
no more than one turn.
5. Tighten straight fittings to torque
shown.
6. Tighten while holding body of fitting
with a wrench.
Recommended
Turns To Tighten
(After Finger
Tightening)
(Flats) (Turn)
Tube
Size
OD
(in.)
Nut Size
Across
Flats
(in.)
Torque
Value*
(N.m) (lb-ft)
6
9
12
18
34
46
75
90
105
140
160
1/2
9/16
5/8
11/16
7/8
1
1-1/4
1-3/8
1-1/2
1-7/8
2-1/8
3/8
7/16
1/2
9/16
3/4
7/8
1-1/16
1-3/16
1-5/16
1-5/8
1-7/8
8
12
16
24
46
62
102
122
142
190
217
2
2
2
2
2
1-1/2
1
1
3/4
3/4
1/2
1/3
1/3
1/3
1/3
1/3
1/4
1/6
1/6
1/8
1/8
1/12
* The torque values shown are based on lubricated connections as in reassembly.
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