MacDon CA20 Operators Manual - Manual (Page 70)

MAINTENANCE AND SERVICE
Form 169009 68 Model Year - 2009
8.3.2 HYDRAULIC FITTINGS
8.3.2.1 O-ring Type
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.
TORQUE
VALUE*
RECOMMENDED
TURNS TO
TIGHTEN (AFTER
FINGER
TIGHTENING)
THD
SIZE
(in.)
NUT SIZE
ACROSS
FLATS
(in.)
lbf-ft N·m Flats Turns
3/8 1/2 6 8 2 1/3
7/16 9/16 9 12 2 1/3
1/2 5/8 12 16 2 1/3
9/16 11/16 18 24 2 1/3
3/4 7/8 34 46 2 1/3
7/8 1 46 62 1-1/2 1/4
1-1/16 1-1/4 75 102 1 1/6
1-3/16 1-3/8 90 122 1 1/6
1-5/16 1-1/2 105 142 3/4 1/8
1-5/8 1-7/8 140 190 3/4 1/8
1-7/8 2-1/8 160 217 1/2 1/12
* The torque values shown are based on lubricated
connections as in reassembly.
8.3.2.2 Flare Type
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.
TORQUE
VALUE*
RECOMMENDED
TURNS TO
TIGHTEN
(AFTER FINGER
TIGHTENING)
TUBE
SIZE
O.D.
(in.)
NUT
SIZE
ACROSS
FLATS
(in.)
lbf-ft N·m Flats Turns
3/16 7/16 6 8 1 1/6
1/4 9/16 9 12 1 1/6
5/16 5/8 12 16 1 1/6
3/8 11/16 18 24 1 1/6
1/2 7/8 34 46 1 1/6
5/8 1 46 62 1 1/6
3/4 1-1/4 75 102 3/4 1/8
7/8 1-3/8 90 122 3/4 1/8
* The torque values shown are based on lubricated
connections as in reassembly.
LOCKNUT
WASHER
GROOVE
FITTING
O-RING
SEAT
FLARE
FLARESEAT BODY
NUT