TM 5-3895-373-34
2.54.
REPAIR HYDRAULIC HOSES, TUBES, AND FITTINGS - Continued
A.
REMOVE - Continued.
Hydraulic
oil
can
be
moderately
flammable and can be an irritant to
the
skin,
eyes,
and
respiratory
system. Avoid prolonged exposure.
Eye protection and rubber gloves
must be worn when working with
hydraulic oil.
Paving machine must be turned off
and hydraulic line pressure bled off
by slowly opening fitting prior to
opening the hydraulic circuit. A
pressurized hydraulic circuit can emit
a high- energy spray when a hose or
fitting is opened under pressure.
Failure to slowly bleed off hydraulic
pressure
may
result
in
serious
injuries to personnel.
When loosening a tube coupling nut,
secure - mating fitting with backup
wrench. Failure to secure mating
fitting
can
stress
connecting
components and may result in failure
of tubes and accessories.
d.
Install combination wrench or wrenches (5)
(Items
115
and
116,
Appendix
D)
on
connecting fittings. Wrap connection fittings
with machinery wiping towel (three layers,
minimum) to protect against contact with high
energy spray.
e.
Slowly loosen tube coupling nut (6) about 1/8
turn. Allow several seconds for pressure to
bleed off, then unscrew tube coupling nut
another 1/8 turn. Continue this procedure until
pressure is bled off and tube coupling nut is
loose.
NOTE
If hydraulic hose is tightly embedded
in contamination. equipment, delay
hose
removal.
Embedded
hose
replacement is covered in INSTALL
procedures, step C.4.a.
f.
Tag and remove hoses, tubes, and fittings as
needed to replace faulty equipment or correct
hydraulic leaks. Plug and cap all open hose
fittings, tube fittings, and hydraulic circuit
fittings
to
protect
against
system
contamination.
g.
Remove preformed packings from o-ring boss
(ORB) type
fittings.
Discard
preformed
packings.
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