Hydraulic Hose and Tube Installation (O--ring Face Seal Fitting)
1.
tube and the fitting are free of burrs, nicks, scratches or
any foreign material.
Make sure threads and sealing surfaces of the hose/
C. Use asecond wrench totightenthe nutto thecor-
rect Flats From Wrench Resistance (F.F.W.R.). The
markingsonthenutandfittingbodywillverifythatthe
connection has been properly tightened.
2.
As a preventative measure against leakage, it is rec-
ommended that the face seal O--ring be replaced any
time the connection is opened. Make sure the O--ring is
installedandproperlyseatedinthefittinggroove.Lightly
lubricate the O--ring with clean hydraulic oil.
Size
F.F.W.R.
4
6
8
(1/4 in. nominal hose or tubing)
(3/8 in.)
(1/2 in.)
(5/8 in.)
(3/4 in.)
(1 in.)
1/2 to 3/4
1/2 to 3/4
1/2 to 3/4
1/2 to 3/4
1/3 to 1/2
1/3 to 1/2
10
12
16
3.
Place the hose/tube against the fitting body so that
theflatfaceofthehose/tubesleevefullycontactstheO--
ring in the fitting.
Swivel Nut
Fitting Body
O--ring
4.
Thread the swivel nut onto the fitting by hand. While
holding the hose/tube with a wrench, use a torque
wrench to tighten the swivel nut to the recommended
installation torque shown in Figure 4. This tightening
process will require the use of an offset wrench (e.g.
crowfoot wrench). Use of an offset wrench will affect
torque wrench calibration due to the effective length
change of the torque wrench. Tightening torque when
usingatorquewrenchwithanoffsetwrenchwillbelower
than the listed installation torque (see Using a Torque
Wrench with an Offset Wrench in the Torque Specifica-
tions section of Chapter 2 -- Product Records and Main-
tenance).
Tube or Hose
Figure 2
5.
If a torque wrench is not available or if space at the
swivel nut prevents use of a torque wrench, an alternate
method of assembly is the Flats From Wrench Resist-
ance (F.F.W.R.) method (Fig. 2).
Mark Nut
and Fitting
Body
Final
Position
A. Usingawrench,tightentheswivelnutontothefit-
tinguntillightwrenchresistance isreached(approxi-
mately 30 in--lb).
Initial
Position
Extend Line
AT WRENCH RESISTANCE
AFTER TIGHTENING
B. Mark the swivel nut and fitting body. Hold the
hose/tube with a wrench to prevent it from turning.
Figure 3
Fitting Dash Size
Hose/Tube Side Thread Size
9/16 -- 18
Installation Torque
4
6
18 to 22 ft--lb (25 to 29 N--m)
27 to 33 ft--lb (37 to 44 N--m)
37 to 47 ft--lb (51 to 63 N--m)
60 to 74 ft--lb (82 to 100 N--m)
85 to 105 ft--lb (116 to 142 N--m)
110 to 136 ft--lb (150 to 184 N--m)
140 to 172 ft--lb (190 to 233 N--m)
11/16 -- 16
8
13/16 -- 16
10
12
16
20
1 -- 14
1 3/16 -- 12
1 7/16 -- 12
1 11/16 -- 12
Figure 4
Page 4 -- 4
Hydraulic System
ProCore Processor
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