Flare-Type Hydraulic Fittings - MacDon M155 Unloading And Assembly Instructions

Table 8.9 Metric Bolt Bolting into Cast Aluminum
Nominal
8.8
Size (A)
(Cast Aluminum)
Nm
–
M3
–
M4
–
M5
M6 9
M8 20
M10 40
M12 70
–
M14
–
M16

8.1.4 Flare-Type Hydraulic Fittings

The standard torque values are provided for flare-type hydraulic fittings. If a procedure specifies a different torque value
for the same type and size of fitting found in this topic, refer to the value specified in the procedure instead.
1. Inspect flare (A) and flare seat (B) for defects that might
cause leakage.
2. Align tube (C) with fitting (D) and thread nut (E) onto the
fitting without lubrication until contact is made between
the flared surfaces.
3. Torque fitting nut (E) to the specified number of flats from
finger tight (FFFT) or to a given torque value in Table
page 277.
4. Secure fitting (D) with two wrenches. Place one wrench on
fitting body (D), and tighten nut (E) with the other wrench
to the torque value shown in Table
5. Verify the final condition of connection.
Table 8.10 Flare-Type Hydraulic Tube Fittings
Thread Size (in.)
SAE Dash Size
-2
-3
-4
-5
-6
-8
-10
7. Torque values shown are based on lubricated connections as in reassembly.
262320
Bolt Torque
10.9
(Cast Aluminum)
Nm
lbf·ft
– –
–
4
–
8
6 12
14 28
28 55
52 100
– –
– –
8.10, page 277.
Nm
5/16–24 4–5
3/8–24
7–8
7/16–20
18–19
1/2–20
19–21
9/16–18 30–33
3/4–16 57–63
7/8–14 81–89
REFERENCE
lbf·ft
1
2.6
5.5
9
20
40
73
–
Figure 8.9: Bolt Grades
–
A
8.10,
C
Figure 8.10: Hydraulic Fitting
7
Torque Value
lbf·ft
3–4
5–6
13–14
14–15
22–24
42–46
60–66
277
A
B
E
Flats from Finger Tight (FFFT)
Swivel Nut or
Tube
—
—
2 1/2
2
2
2
1 1/2
D
Hose
—
—
2
2
1 1/2
1 1/2
1 1/2
Revision A