unnecessarily, as this type of cushioning material
deteriorates rapidly when exposed to air.
REMOVING HOSE OR HOSE
Hose or hose assembly removal procedures must
include contamination control procedures as well as
actual removal procedures to prevent contamination
to the opened system.
Contamination Control Procedures
Perform contamination control procedures before
removing any hose or hose assemblies. You should
use approved solvents and clean, lint-free cloths to
clean the affected area and wipe down fittings to
remove excessive contaminants.
Use a suitable
container to catch spilled fluid. Have replacement
hose, hose assemblies, or protective closures on hand
for installation when you disconnect hose or hose
assemblies. If hose replacement is not practical, cap
or plug hose or hose assembly ends immediately after
Once contamination control has been accom-
plished, you can begin removal of hose and hose
assemblies. Remove all supporting clamps from hose
or hose assembly. Remove lockwire (if present) from
swivel nuts. Turn swivel nuts only to disconnect hose
assembly. Loosen nuts carefully to avoid damage.
Disconnect the hose assembly by using two open-end
wrenches. One is to grip and prevent turning of the
fitting to which the hose assembly is connected, and
the other is to loosen the swivel nut.
Hose and hose assemblies (particularly Teflon®)
have a tendency to become set to shape in service.
Some Teflon® hose assemblies are deliberately
preformed during the fabrication process. Do not
attempt to straighten a preformed hose. Protect the
preformed areas from distortion by a restrainer. The
restrainer may be of wire, metal, plastic forms, or any
other suitable device to retain the preformed
configuration. Install the protective closures to seal
open parts of hydraulic lines and ends of removed
hose or hose assemblies.
INSTALLING HOSE OR HOSE
When you install hose or hose assemblies, it is
important that you follow certain practices or
procedures to prevent premature failure of hose or
hose assembly or possible injury. Before you begin
actual installation procedures, there are guidelines
you should remember about installing hose or hose
assemblies. The replacement hose or hose assembly
must be a duplicate of the one removed in length,
outside diameter, material, type, contour, and
Only fluid conforming to MIL-H-5606,
MIL-H-83282, or MIL-H-81019 is to be used on
hydraulic or pneumatic hose installations. Do not use
oil of any type on self-sealing hose as an aid to
installation. Compatible oil, approved for the
purpose, may be used on all other types of fuel, oil,
and coolant hose installations.
When you install or handle hose or hose
assemblies, you can sustain injuries to your hands or
damage to the hose if it is kinked. You should take
care to prevent situations where injuries or kinking
can occur. A hose that is bent to a smaller radius than
specified might cause kinking. See table 5-8.
A preformed hose assembly, or one that has
become set-to-shape of its operating position, is
straightened or handled without a protective restraint.
A hose or hose assembly that is twisted during
handling, removal, or installation can easily cause
Check hose or hose assembly before installing it
to make sure that identification bands and protective
closures are present as required after proof pressure
testing. Inspect hose for proper type and size, and for
aging (signs of deterioration such as cracks, dis-
coloration, hardening, weather checking, or fungus).
Check the braid for two or more broken wires per
plait, or more than six broken wires per linear foot.
Inspect for broken wires where kinking is suspected.
Evidence of internal restriction of tube due to
collapse, kinking, wire-braid puncture, or other
damage can be found by using one of the following
methods of inspection: For straight hose assembly,
insert a light at one end and visually inspect from the
For elbow fitting on both ends
(practical for larger sizes only), insert flexible