INLAND AND COASTAL LARGE TUG (LT)
COMPRESSED AIR SYSTEM, REPLACE
Tools and Special Tools:
Tool Kit, General Mechanic's (Item 1, Table 2,
CLOSE, lock out, and tag out (FM 55-502) the cut-
off valve upstream of the affected drain.
Set to OFF, lock out, and tag out (FM 55-502) J.B.
Two Watercraft Engineers, 88L
FOR AUTO DRAIN ON AIR RECEIVER (INC.
REFER DRYER) circuit breaker on 102v distri-
bution panel no. 4.
REPLACE AUTOMATIC DRAINS
1. Remove the four screws (figure 1, item 1) that secure the junction box cover (figure 1, item 2). Remove the
Repair the drains only after the affected circuit has been secured, locked out, and
tagged out. Performing repairs with the circuit energized may result in injury.
2. Use a multimeter to check for available voltage at the wiring terminals inside the junction box. If voltage is
present, ensure that the proper circuit breaker is OFF, locked out, and tagged out (FM 55-502). If no voltage
is present, continue with the procedure.
3. Label and disconnect the wiring (figure 1, item 3) for the affected automatic drain. Loosen the packing gland
(figure 1, item 4), and remove the wiring from the junction box.
4. Unscrew the automatic drain valve (figure 2, item 1) from its piping (figure 2, item 2). The valve's wiring
(figure 2, item 3) is integral to the valve and is removed with the valve.