TM 55-1925-286-13&P
UNIT MAINTENANCE
AIR COMPRESSOR FOR
INLAND AND COASTAL LARGE TUG (LT)
AIR COMPRESSOR, REPLACE
INITIAL SETUP:
Personnel Required:
Tools and Special Tools:
Two Watercraft Engineers, 88L
Tool Kit, General Mechanic's (Item 1, Table 2,
References:
FM 55-502
Materials/Parts:
NOTE
This work package prepares the air compressor(s) for replacement. Actual replace-
ment of the air compressors is accomplished by direct support maintenance.
REMOVAL
1. Perform system shutdown for the applicable air compressor (WP 0005 00).
2. At 440V power panel no. 4, set to OFF, lock out, and tag out (FM 55-502) the applicable air compressor circuit
breaker as shown in table 1.
3. CLOSE, lock out, and tag out the applicable dryer cutoff and bypass valves as indicated in table 1 and
figure 1.
WARNING
Replace the air compressor motor only after the affected circuit breaker has been
secured, locked out, and tagged out. Performing replacement with the circuit
energized may result in injury or death.
4. Use a multimeter to check for available voltage at the motor's wiring (figure 1, item 3). If voltage is present
ensure that the proper circuit breaker is set to OFF locked out and tagged out (FM 55-502). If no voltage is
present, continue with procedure.
5. Label, disconnect, and remove the motor wiring (figure 1, Item 3) from the air compressor motor (figure 1,
item 4).
6. Use a multimeter to check for available voltage at the pressure switch wiring L1 (figure 2, item 1) and L2
(figure 2, item 2). If voltage is present ensure that the proper circuit breaker is set to OFF locked out and
tagged out (FM 55-502). If no voltage is present, continue with procedure.
7. Label, disconnect, and remove L1 (figure 2, item 1) and L2 (figure 2, item 2), wiring from the pressure switch
(figure 2, item 3).
0020 00-1