TM 55-1930-209-14&P-7
4-5.3.2 Replacement
a. Shut down air compressor system following procedures in paragraph 3-8.2.
b.
Redtag power panel 1 circuit breaker 3P5 indicating, "WARNING DO NOT ACTIVATE REPAIRS BEING MADE.
c.
Disconnect the union nearest to air filter 2 and disconnect air lines from filter 2.
d.
Connect air lines to new filter making certain the air flow is in the direction of the arrow on the new regulator.
Reconnect the union Use pipe tape on threads to prevent leaks.
e.
Start air compressor system by following the procedures in paragraph 3-2.1 and check for leaks.
4-5.4
Safety valve. If air compressor safety valve fails its monthly maintenance check, perform these procedures:
a.
Shut down air compressor system by following procedures in paragraph 3-8.2.
b.
Redtag power panel 1 circuit breaker 3P5 indicating, "WARNING DO NOT ACTIVATE REPAIRS BEING MADE."
c.
Unscrew safety valve.
d.
Screw In new safety valve (Barge 1 P/N 9710-5332-00) (Barges 2 and 3 P/N 91A033175-001) wrench tight.
e.
Remove red tag from power panel 1 circuit breaker 3P5 f. Start air compressor system by following procedures in
paragraph 3-2.1.
g.
When receiver pressure gauge reads at least 100 psi, check receiver safety valve by pulling safety link. Air
should escape from receiver through valve. If not, repeat above procedures and install another new safety valve.
This valve is NOT adjustable or repairable.
h.
Record completion of this maintenance item in log book.
4-5.5
Automatic air pressure regulator (pressure switch). If compressor/receiver troubleshooting indicates pressure
switch may be faulty, perform these procedures:
a. Shut down air compressor system by following procedures In paragraph 3-8.2.
b.
Redtag power panel 1 circuit breaker 3P5 indicating, "WARNING DO NOT ACTIVATE REPAIRS BEING MADE."
c.
On pressure switch on top of receiver (Figures 3-2 and 3-3), unscrew nipple from receiver.
d.
Disconnect nipple from tee and conduit from 90° elbow. Remove pressure switch
e.
Install new pressure switch (Barge 1 P/N 9710-530201) (Barges 2 and 3 CAGEC 16327, P/N 4X678) Connect
nipple and 900 elbow. Check all fittings for tightness.
f.
Remove red tag from power panel 1 circuit breaker 3P5.
g.
Start air compressor system by following procedures in paragraph 3-2.1.
h.
Monitor pressure in receiver. Compressor should build this pressure to designated pressure listed on name/data
plates.
i.
Open air station 1 by turning counterclockwise and bleed air pressure until pressure switch activates compressor
Close air station 1 by turning clockwise until it stops Compressor should continue to pump compressed air Into
receiver until receiver pressure gauge indicates 155 psi Pressure switch should then cut off air compressor.
j.
Record completion of this maintenance item in log book.
4-9
