TM 55-203
nipple end. If the lining does not appear to be damaged,
g.
After periodic attention has been given
a steel ball of 3/4-inch diameter must be passed through
airbrake equipment on freight cars, old stenciled
the hose assembly, including the gasket, to determine
cleaning dates must be obliterated and new dates
whether the hose is obstructed After this test, the hose
stenciled in accordance with requirements of current
must be subjected to a pressure test of 140 pounds
rules
either while submerged In water oil while entirely coated
with soapsuds airbrake hose must be replaced if over 8
h.
Retaining valves must be thoroughly
years old or the date is obliterated
cleaned with cleaning solution by removing valve caps,
wraps excluder, and valves. Vent ports and drilled
k . Brakeshoes will be removed when worn
passages must be inspected for obstructions caused by
to 1/4 inch or less in thickness, next to the flange. Piston
pipe scale, dirt, or wasp activities and to determine
travel must be adjusted by hand, or by the slack
visible defects Small amounts of graphite grease must
adjuster, when brakeshoes are renewed. The piston
be applied to the threads -of retaining-valve caps when
travel must be sufficient to provide proper show
they are being reassembled. The strainer in a four-
clearance when the brakes are released, but with a full
position type retaining-valve bracket must be thoroughly
service brake application, must be adjusted within the
cleaned by being blown with compressed air, and, if
limits of 7 to 9 inches. Before piston travel IS adjusted
defective, must be replaced Retaining valves must be
on cars, or before work is done on brake rigging or parts
adequately secured in a vertical position and handles
adjacent to brake rigging on a car in a train when the
must move freely.
train line is charged, the cutout cock in the branch pipe
must be closed The reservoir draincocks and release
i. Retaining valves and retaining-valve
valves must remain open until the work is completed.
pipes on cars must be tested as prescribed by approved
manufacturer's code of tests.
l. Single-pressure type retaining valves
j. Brake pipe hose which has been
with bypass chokes on passenger cars must be tested
removed from passenger cars may be reused on freight
with 50 pounds of initial cylinder pressure with the
cars if such hose satisfactorily passes inspection. If a
handle in a horizontal position After this test, brake
hose is not condemned and is to be reused on a freight
cylinder air pressure must release In approximately 1
car, visual inspection must be made of its inner lining by
minute after triple or control valves have been moved to
placing the opening In the coupling against a frosted,
release position.
150-watt electric light bulb and sighting through the
16-8
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