Figure 5-20.—Hose twist.
Figure 5-22.—Hose clamp mounting.
inspection light into one end and visually inspect from
the opposite end using a small, angled, dental-type
mirror. Inspect for any separation of covers or braids
from inner tube, or from adjacent covers or braids.
Look for flaring or fraying of braid. Look for blisters,
bubbles, or bulging. Inspect for corrosion. A hose
that has carbon steel wire braid is subject to corrosion,
which may be detected as brownish rust coloration
penetrating the outer braid.
Inspect end fittings for proper type and size,
corrosion and cleanliness, nicks, scratches, or other
damage to the finish that affects corrosion resistance.
Look for damage to threaded areas, damage to
cone-seat sealing surfaces damage to flange fittings,
warping of flange, and for nicks or scratches on the
sealing surface or gasket.
Installation Procedures
Remove the protective closures from hydraulic
lines, hose, or hose assemblies. When possible,
install hose or hose assemblies so that identification
markings are visible. Install hose or hose assemblies
without twisting, chafing, or overbending (fig. 5-20).
Observe bend radius in table 5-8. Greater
bend-radius is preferred where possible. Install hose
or hose assemblies with a slight bow or slack to
compensate for contraction pressure on the line
(fig. 5-21).
Figure 5-21.—Hose slack.
When connecting hose or hose assemblies to an
engine or an engine-mounted accessory, provide 1 1/2
inches of slack or a suitable bend between the last
point of support and the engine or accessory
attachment. Fingertighten swivel connector nuts to
avoid stripping threaded areas of fittings. Before
applying final torque to end fittings, make sure hose
Table 5-9.—Swivel Nut Installation Torque (Inch-Pound) for
Flared and Flareless Fittings
HOSE
STEEL
ALUMINUM
SIZE
MIN
MAX
MIN
MAX
2
75
85
20
30
3
95
105
25
35
4
135
145
50
65
5
170
190
70
90
6
215
245
110
130
8
430
470
230
260
10
620
680
330
360
12
855
945
460
500
16
1140
1260
640
700
20
1520
1680
800
900
24
1900
2100
800
900
32
2660
2940
1800
2000
NOTE:
Torque values based on lubrication
with fluid MIL-H-5606 or
MIL-H-83282 prior to installation.
5-26
