Greensmaster 3150 Hydraulic SystemPage 4 -- 5
Hydraulic Hose and Tube Installation (O--Ring Face Seal Fitting)
1. Make surethreadsand sealingsurfacesof thehose/
tube and the fitting are free of burrs, nicks,scratches or
any foreign material.
2. Asa preventativemeasureagainstleakage,itis rec-
ommended that the face seal O--ring be replaced any
time the connection is opened. M ake sure the O--ring is
installedandproperlyseatedinthefittinggroove.Lightly
lubricate the O--ring with clean hydraulic oil.
3. Place the hose/tube against the fitting body so that
theflatfaceofthehose/tubesleevefullycontactstheO--
ring in the fitting.
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 5. 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
usingatorquewrenchwitha noffsetwrenchwillbelower
than the listed installation torque (see Using a Torque
Wrench with an Offset Wrench in the Torque Specifica-
tionssection of Chapter2 -- Product Records andMain-
tenance).
5. If a torque wrench is not available or if space at the
swivelnutpreventsuseofatorquewrench,analternate
method of assembly is the Flats From Wrench Resist-
ance (F.F.W.R.) method (Fig. 2).
A. Usingawrench,tightentheswivelnutontothefit-
tinguntillightwrenchresistanceisreached(approxi-
mately 30 in--lb).
B. Mark the swivel nut and fitting body. Hold the
hose/tube with a wrench to prevent it from turning.
C. Useasecondwrenchtotightenthenuttothecor-
rect Flats From Wrench Resistance (F.F.W.R.). The
markingsonthenutandfittingbodywillverifythatthe
connection has been properly tightened.
Size F.F.W.R.
4 (1/4 in. nominal hose or tubing) 1/2 to 3/4
6 (3/8 in.) 1/2 to 3/4
8 (1/2 in.) 1/2 to 3/4
10 (5/8 in.) 1/2 to 3/4
12 (3/4 in.) 1/3 to 1/2
16 (1 in.) 1/3 to 1/2
Figure 3
O--ring
Fitting Body
Swivel Nut
Tube or Hose
Figure 4
Final
AT WRENCH RESISTANCE
Position
Mark Nut
and Fitting
Initial
Position
Extend Line
AFTER TIGHTENING
Body
Fitting Dash Size Hose/Tube Side Thread Size Installation Torque
4 9/16 -- 18 18to22ft--lb(25to29N--m)
6 11/16 -- 16 27to33ft--lb(37to44N--m)
8 13/16 -- 16 37to47ft--lb(51to63N--m)
10 1--14 60 to 74 ft--lb (82 to 100 N--m)
12 13/16--12 85to105ft--lb(116to142N--m)
16 17/16--12 110to136ft--lb(150to184N--m)
20 1 11/16 -- 12 140 to 172 ft --lb (190 to 233 N--m)
Figure 5
Hydraulic
System
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