Metric Bolt Specifications Bolting Into Cast Aluminum; Flare-Type Hydraulic Fittings - MacDon FFT FD75 Assembly Instructions Manual

7.1.3 Metric Bolt Specifications Bolting into Cast Aluminum

Table 7.9 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

7.1.4 Flare-Type Hydraulic Fittings

1. Check flare (A) and flare seat (B) for defects that might
cause leakage.
2. Align tube (C) with fitting (D) and thread nut (E) onto
fitting without lubrication until contact has been made
between flared surfaces.
3. Torque fitting nut (E) to specified number of flats from
finger tight (FFFT) or to a given torque value in
Table 7.10, page 284.
4. Use two wrenches to prevent fitting (D) from rotating.
Place one wrench on fitting body (D), and tighten
nut (E) with other wrench to torque shown.
5. Assess final condition of connection.
Table 7.10 Flare-Type Hydraulic Tube Fittings
SAE Dash Size Thread Size (in.)
-2
-3
-4
-5
2. Torque values shown are based on lubricated connections as in reassembly.
214325
Bolt Torque
10.9
(Cast Aluminum)
Nm
lbf·ft
– –
–
4
–
8
6 12
14 28
28 55
52 100
– –
– –
Nm
5/16–24 4–5
7–8
3/8–24
7/16–20 18–19
19–21
1/2–20
REFERENCE
lbf·ft
1
2.6
5.5
9
20
40
Figure 7.9: Bolt Grades
73
–
–
Figure 7.10: Hydraulic Fitting
Torque Value 2
lbf·ft
3–4
5–6
13–14
14–15
284
Flats from Finger Tight (FFFT)
Swivel Nut or
Tube
Hose
—
—
2-1/2
2
—
—
2
2
Revision A