TM 55-203
(1) Place a "dummy" coupling on one end,
with a gasket under the cap, see that the gasket is in good
and connect the car to the yard steam supply line at the
condition and properly seated. Renew the gasket if
other end.
required.
(2) Place a steam pressure of 50 pounds on
the line.
(3) Check all shutoff valves and see that they
essential that the wings and bodies be cleaned thoroughly
are open.
when repairing the valve. The inside of the valve body
(4) Close all floor and overhead admission
can be cleaned without removing it from the car. When
valves.
reassembling the valve, care must be exercised in the
(5) Inspect all regulators to determine that
alinement of parts. With a thorough cleaning and proper
they do not have a continuous steam blow.
assembly, these valves should operate between shopping
(6) Inspect all conduits, end valves and
periods with little attention other than an occasional check
branch piping for leaks.
for free operation. In some valves of the cutout type, the
(7) Move admission valves to the "on"
valves controlling the floor-heat radiation normally are
position; see that a complete heating circuit is made in all
open and are closed electrically as are the valves
coils.
controlling steam to overhead radiators.
During
(8) On vapor loop equipment, test the loop
scheduled maintenance, the needle inlet valve should be
by closing all admission valves and checking all shutoff
replaced if the seat is badly wiredrawn, or a sticking valve
valves to determine that they are in ,"open" position. If
will result.
there is a slight blow at the regulator, it indicates a faulty
loop retarder. If a heavy steam blow is noted, it indicates
l. Terminal Tests. Steam-heat equipment will be
a bad valve or bellows in the regulator.
tested in car yards to determine if in proper operating
(9) Open each admission valve separately
condition, prior to placing passenger type cars so
and check for a blow at the regulator. If a blow occurs, it
equipped into train service. The following procedures
indicates a faulty retarder or a dirty seat in that particular
should be followed:
coil.
11-6
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