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2. As a preventative measure against leakage, it is recommended 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.
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.)
3. Place the hose/tube against the fitting body so that
the flat face of the hose/tube sleeve fully contacts the Oring in the fitting.
Swivel Nut
Tube or Hose
Final
Position
Initial
Position
Extend Line
AT WRENCH RESISTANCE
B. Mark the swivel nut and fitting body. Hold the
hose/tube with a wrench to prevent it from turning.
AFTER TIGHTENING
Figure 38
Fitting Dash Size
Hose/Tube Side Thread Size
Installation Torque
4
9/16 - 18
18 to 22 ft- lb (25 to 29 N- m)
6
11/16 - 16
27 to 33 ft- lb (37 to 44 N- m)
8
13/16 - 16
37 to 47 ft- lb (51 to 63 N- m)
10
1 - 14
60 to 74 ft- lb (82 to 100 N- m)
12
1 3/16 - 12
85 to 105 ft- lb (116 to 142 N- m)
16
1 7/16 - 12
110 to 136 ft- lb (150 to 184 N- m)
20
1 11/16 - 12
140 to 172 ft- lb (190 to 233 N- m)
Figure 39
Groundsmaster 3500- D
Page 4 - 5
Hydraulic System (Rev. G)
Wheels, Brakes,
and Chassis
Mark Nut
and Fitting
Body
Electrical
System
Figure 37
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 Resistance (F.F.W.R.) method (Fig. 2).
A. Using a wrench, tighten the swivel nut onto the fitting until light wrench resistance is reached (approximately 30 in- lb).
Fitting Body
O- ring
Hydraulic
System
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 39. 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 Specifications section of Chapter 2 - Product Records and Maintenance).
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
Product Records
and Manuals
C. Use a second wrench to tighten the nut to the correct 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.
Kubota
Diesel Engine
1. Make sure threads and sealing surfaces of the hose/
tube and the fitting are free of burrs, nicks, scratches or
any foreign material.
Safety
Hydraulic Hose and Tube Installation (O- Ring Face Seal Fitting)