TM 5-4310-375-14
4-30. Air discharge piping. Maintenance of air discharge piping is as follows:
a. Inspection - installed items. While unit is running, use a soapy water solution applied with a brush to discharge
piping connections, see figure 4-10, to check for leaks. Leakage will be indicated by bubbling of the solution. Tighten
connections where leakage is found. If tightening does not stop leakage, stop the unit and replace defective parts.
NOTE
Checking for leaks must be done while compressor is running. When motor
and compressor stops, the unloader on the pressure switch bleeds the air
from compressor discharge piping.
b. Removal/Disassembly. As necessary for replacement of damaged parts, remove or disassemble to extent necessary
as follows:
WARNING
Drain air system before performing any maintenance. Open air receiver
drain cock.
(1) Disconnect and remove air outlet tube assembly (1, fig 4-10), remove tube connector (2) and reducing
bushing (3) from top of check valve (11).
(2) Unscrew and remove tubing elbow (4) and reducing bushing (5) from air compressor aftercooler air outlet
port.
(3) Remove two nuts (6), screws (7), and tubing clips (8) securing unloader tube assembly (9) to air receiver
saddle. Disconnect tube assembly (9) from pressure switch unloader and tubing connector (10). Remove the
tube assembly (9).
(4) Unscrew and remove tubing connector (10), check valve (11) and reducing bushing (12).
c.
Reassembly /Installation. Replace all defective parts and reassemble or install as follows:
(1) Install reducing bushing (12, fig 4-10) and check valve (11) with port for tube connector (10) facing as
shown so that tube assembly (9) will connect when assembled. Install connector (10).
(2) Install tube assembly (9) connecting to tube connector (10) and unloader on pressure switch. Secure tube
assembly (9) to air receiver saddle with two each tubing clips (8), screws (7) and nuts (6).
(3) Install reducing bushing (5) into air outlet of compressor aftercooler. Assemble elbow (4), install reducing
bushing (3), tubing connector (2), and install air outlet tube assembly (l).
(4) When unit is started, check all connections for leaks with a soapy water solution applied with a brush.
4-25
