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Hydraulic Hose and Tube Installation (O−Ring Face Seal Fitting)
1. Make sure threads and sealing surfaces of the hose/
tube and the fitting are free of burrs, nicks, scratches or
any foreign material.
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
installed and properly seated in the fitting groove. Lightly
lubricate the O−ring with clean hydraulic oil.
3. Place the hose/tube against the fitting body so that
the flat face of the hose/tube sleeve fully contacts the O−
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 3. 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
using a torque wrench with an offset wrench will be lower
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).
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).
A. Using a wrench, tighten the swivel nut onto the fit-
ting until light wrench resistance is reached (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.
Fitting Dash Size
4
6
8
10
12
16
20
Groundsmaster 3500
Hose/Tube Side Thread Size
9/16 − 18
11/16 − 16
13/16 − 16
1 − 14
1 3/16 − 12
1 7/16 − 12
1 11/16 − 12
Figure 3
Page 5 − 5
C. Use a second wrench to tighten the nut to the cor-
rect Flats From Wrench Resistance (F.F.W.R.). The
markings on the nut and fitting body will verify that the
connection has been properly tightened.
Size
4 (1/4 in. nominal hose or tubing)
6 (3/8 in.)
8 (1/2 in.)
10 (5/8 in.)
12 (3/4 in.)
16 (1 in.)
Swivel Nut
O−ring
Tube or Hose
Figure 1
Mark Nut
Final
and Fitting
Position
Body
Extend Line
AT WRENCH RESISTANCE
Figure 2
Installation Torque
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)
F.F.W.R.
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
Fitting Body
Initial
Position
AFTER TIGHTENING
Hydraulic System
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