HYDRAULICS
8C-8
HYDRAULIC TUBE AND HOSE
FITTINGS
37° FLARE FITTINGS
Torque Recommendations
1. Assemble the tube nut adapter to the fitting with a
minimum torque (finger tight) until the flare con-
tacts the seat on the fitting body.
2. For tightening reference mark a line lengthwise on
the flats of both the nut and adapter fitting with a
marker (Figure 8C-1).
Figure 8C-1. Reference Marking
3. Using a wrench, tighten the nut the amount shown
in Table 8C-1. The line will show which fittings
have been tightened correctly and also indicates if
a fitting is becoming loose.
Table 8C-1: 37° Flare Torque Recommendations
Table 8C-2: Rotation of Hex Screws
HOSE INSTALLATION
INSTRUCTIONS
1. Hold the fixed portion of the hose coupling with
one wrench; use a second wrench to tighten or
loosen the hose nut. This will avoid damaging the
fitting seal. When tightening a hose, do not permit
it to twist; hold it in a normal straight position.
2. When installing mower hoses, place the fittings at
angles to avoid contact with fixed parts when turn-
ing. Make sure hoses are assembled to proper “A”
and “B” ports on components.
O-RING BOSS FITTINGS
On hoses with o-ring fittings, make sure o-rings are
clean and hose fittings are properly seated before tight-
ening. Always install new o-rings (Figure 8C-2).
Table 8C-3: Replacement)-Rings for O-Ring Boss
Fittings
WARNING
To avoid serious bodily injury, always lower mower
fully, place all controls in neutral and shut off the
engine before inspecting the hydraulic lines or
hoses. Never run hands across tubes, hoses, or fit-
tings to check for leaks. Hydraulic fluid escaping
under pressure can have sufficient force to penetrate
skin and may cause infection in a minor cut or open-
ing in the skin.
Assemble Finger Tight
and Mark as Shown.
Tighten per Chart
SAE
Dash
Size
Thread
Size
Tube
O.D.
Torque In-
lbs
# of Flat
Rotations
3 3/8-24 0.188 95-105 1 1/2:1 3/4
4 7/16-20 0.250 135-145 2 1/4:2 3/4
5 1/2-20 0.312 170-190 3 1/4:3 3/4
6 9/16-18 0.375 215-245 2 1/4:2 3/4
8 3/4-16 0.500 430-470 2 1/4:2 3/4
10 7/8-14 0.625 680-750 2:2 1/2
12 1 1/16-12 0.750 950-1050 2:2 1/2
14 1 3/8-12 0.875 1000-1100 1:1 1/2
16 1 5/16-12 1.000 1300-1360 2 1/4:2 3/4
20 1 5/8-12 1.250 1520-1600 1 1/4:1 3/4
24 1 7/8-12 1.500 1900-2000 3/4:1 1/4
Tube O.D. or Hose I.D. Rotate No. of Hex Flats
3/8” 2
1/2” 2
5/8” 1 1/2-2
1” 3/4-1
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