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 TM 55-1905-242-14
UNIT MAINTENANCE
FOR LANDING CRAFT, MECHANIZED (LCM-8) (ALL VESSELS WITH MOD 2 APPLICATION)
MAST, REPLACE
INITIAL SETUP:
Personnel Required:
Tools and Special Tools:
One Watercraft Engineer, 88L
Tool Kit, Mechanic's Rail and Marine (Item 1,
Two Additional Crewmembers
Table 1, WP 0230 00)
50 feet or more of mooring line
References:
Equipment Condition:
FM 55-502
NAV LT PANEL, AN/PSN-11 GPS, and DIGITAL
COMPASS circuit breakers locked out and
tagged out IAW FM 55-502
REMOVAL
WARNING
Use two crewmembers to lift heavy loads. Heavy loads can crush. Do not allow any
body parts to come under the load or between the load and a stationary object. Failure
to comply can result in serious injury or death.
1.
While one person supports the upper mast section (1), remove the two nuts and bolts (2) that secure the upper mast
section to the lower mast section (3).
2.
Gently lower the upper mast section (1) into the lower mast section (3).
3.
Label and disconnect the navigation light wiring (4) from the mastlight connector panel (5).
4.
Label and disconnect the leads to the GPS antenna (6) and to the digital compass unit (7).
5.
Tie one end of a mooring line around the upper mast section (1) near its junction with the lower mast section (3).
6.
Lead the mooring line forward onto the accommodation module top and position two crewmembers to hold the mooring
line.
7.
With the mooring line holding the mast upright, remove the two bolts and nuts (8) that secure the lower mast section (3)
to the pilothouse top (9).
8.
Using the mooring line to control its descent, carefully lower the mast aft until it rests on the deck.
9.
While two crewmembers hold the lower mast section (3), remove the mast pivot pin (10).
10. Carefully lower the mast the rest of the way to the deck.
11. Remove all navigation lights (11), the GPS antenna (6), the loudhailer speaker (12), the digital compass unit (7), and all the
connecting wiring from the old mast.
12. Transfer the navigation lights (11), the GPS antenna (6), the loudhailer speaker (12), the digital compass unit (7), and all
the connecting wiring to the new mast.
0075 00-1
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