Page 71
472H Potato Harvester Owner Operator’s Manual
6.6 HYDRAULIC FITTING TORQUE
TIGHTENING FLARE TYPE TUBE FITTINGS *
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 torque
shown.
*
The torque values shown are based on lubricated
connections as in reassembly.
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.
*
The torque values shown are based on lubri-
cated connections as in reassembly
Tube
Size
O.D
Nut
Size
Across
Flats
Torque Value*
Recommended
Turns To
Tighten
(After Finger
Tightening)
(in.)
(in.)
(N.m)
(lb-ft)
(Flats)
(Turn)
3/16
7/16
8
6
1
1/6
1/4
9/16
12
9
1
1/6
5/16
5/8
16
12
1
1/6
3/8
11/16
24
18
1
1/6
1/2
7/8
46
34
1
1/6
5/8
1
62
46
1
1/6
3/4
1-1/4
102
75
3/4
1/8
7/8
1-3/8
122
90
3/4
1/8
Tube
Size
O.D
Nut
Size
Across
Flats
Torque Value*
Recommended
Turns To
Tighten
(After Finger
Tightening)
(in.)
(in.)
(N.m)
(lb-ft)
(Flats)
(Turn)
3/8
1/2
8
6
2
1/3
7/16
9/16
12
9
2
1/3
1/2
5/8
16
12
2
1/3
9/16
11/16
24
18
2
1/3
3/4
7/8
46
34
2
1/3
7/8
1
62
46
1-1/2
1/4
1-1/16
1-1/4
102
75
1
1/6
1-3/16
1-3/8
122
90
1
1/6
1-5/16
1-1/2
142
105
3/4
1/8
1-5/8
1-7/8
190
140
3/4
1/8
1-7/8
2-1/8
217
160
1/2
1/12
