MacDon CA25 OM User Manual
Page 100
SECTION 8. MAINTENANCE AND SERVICING
169593
98
Revision B
8.3.1.3
Flare Type Hydraulic Fittings
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.
SAE
NO.
TUBE
SIZE
O.D.
(in.)
THD
SIZE
(in.)
NUT
SIZE
ACROSS
FLATS
(in.)
TORQUE
VALUE*
RECOMMENDED
TURNS TO
TIGHTEN
(AFTER FINGER
TIGHTENING)
ft·lbf N·m
Flats
Turns
3
3/16
3/8
7/16
6
8
1
1/6
4
1/4
7/16
9/16
9
12
1
1/6
5
5/16
1/2
5/8
12
16
1
1/6
6
3/8
9/16
11/16
18
24
1
1/6
8
1/2
3/4
7/8
34
46
1
1/6
10
5/8
7/8
1
46
62
1
1/6
12
3/4
1-1/16
1-1/4
75
102
3/4
1/8
14
7/8
1-3/16
1-3/8
90
122
3/4
1/8
16
1
1-5/16
1-1/2
105
142
3/4
1/8
* Torque values shown are based on lubricated connections as
in re-assembly.
8.3.1.4
O-ring Type Hydraulic Fittings
a. Inspect O-ring and seat for dirt or obvious
defects.
b. On angle fittings, back off the lock nut until
washer (A) bottoms out at top of groove (B) in
fitting.
c. Hand-tighten fitting until back up washer (A) or
washer face (if straight fitting) bottoms on part
face (C), 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.
SAE
NO.
THD
SIZE
(in.)
NUT SIZE
ACROSS
FLATS
(in.)
TORQUE
VALUE*
RECOMMENDED
TURNS TO TIGHTEN
(AFTER FINGER
TIGHTENING)
ft·lbf N·m Flats
Turns
3 3/8 1/2 6 8
3
3/8
4 7/16 9/16 9 12
4
7/16
5 1/2 5/8 12 16 5
1/2
6 9/16 11/16 18 24
6
9/16
8 3/4 7/8 34 46 8
3/4
10 7/8
1
46 62 10
7/8
12 1-1/16
1-1/4
75 102
12
1-1/16
14 1-3/16
1-3/8
90 122
14
1-3/16
16 1-5/16
1-1/2 105 142
16
1-5/16
20 1-5/8 1-7/8 140 190 20
1-5/8
24 1-7/8 2-1/8 160 217 24
1-7/8
* Torque values shown are based on lubricated connections as
in re-assembly.
FLARE
FLARESEAT
BODY
NUT
LOCK
SEAT
WASHER
O-RING
GROOVE
FITTING
A
B
C