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Hydraulic Hose and Tube Installation
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
3.Place the hose/tube against the fitting body so that the flat face of the hose/tube sleeve fully contacts the
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 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
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
B.Mark the swivel nut and fitting body. Hold the hose/tube with a wrench to prevent it from turning.
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 | 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 | |
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| Swivel Nut | Fitting Body |
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Tube or Hose
Figure 3
Mark Nut |
| Final |
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and Fitting | Position |
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Body |
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| Initial |
Extend Line | Position | ||
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AT WRENCH RESISTANCE |
| AFTER TIGHTENING |
Figure 4
Hydraulic System
Fitting Dash Size | Hose/Tube Side Thread Size |
| Installation Torque |
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4 | 9/16 | 18 |
| 18 to 22 ft |
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6 | 11/16 | 16 |
| 27 to 33 ft | m) | ||
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8 | 13/16 | 16 |
| 37 to 47 ft | m) | ||
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10 | 1 |
| 60 to 74 | lb (82 to 100 | m) | ||
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12 | 1 3/16 | 12 |
| 85 to 105 | lb (116 to 142 | m) | |
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16 | 1 7/16 | 12 |
| 110 to 136 | lb (150 to 184 | m) | |
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20 | 1 11/16 | 12 |
| 140 to 172 ft | m) | ||
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| Figure 5 |
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Groundsmaster 4100 |
| Page 4 |
| Hydraulic System |