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ASSEMBLY - TM-55-1925-292-14-P0322
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TM-55-1925-292-14-P Firefighting Fire Alarm and Fire Suppression Systems Inland and Coastal Large TUG (LT) Manual
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Figure 2. Tapping New Threads
TM 55-1925-292-14&P
GENERAL SUPPORT MAINTENANCE
FIREFIGHTING, FIRE ALARM, AND FIRE SUPPRESSION SYSTEMS FOR
INLAND AND COASTAL LARGE TUG (LT)
DIESEL ENGINE-DRIVEN FIREFIGHTING PUMP, REBUILD
INITIAL SETUP:
Personnel Required:
Tools and Special Tools:
One Machinist, 44E
Tool Kit, General Mechanic's (Item 1, Table 2,
References:
Durco Tool Kit (Item 2, Table 2, WP 0046 00)
Drill, Electric, Portable (Item 16, Table 2,
Threading Kit, Screw (Item 17, Table 2,
Drill Set, Twist Set (Item 18, Table 2,
Equipment Conditions:
Diesel engine-driven firefighting pump disassembled
Drill Set, Twist (Item 19,Table 2, WP 0046 00)
Materials/Parts:
Gloves, Leather (Item 8, Table 3, WP 0049 00)
Goggles, Industrial (Item 9, Table 3,
MACHINING REPAIRS
Due to replacement part availability, expediency of repair, and other factors, it may sometimes be necessary to
repair existing pump components rather than replacing them. For example, a pump shaft may be worn in the seal
area, but otherwise serviceable. If a new pump shaft is unavailable, or if the unit must be returned to service with
minimal down time, it may be possible to build up and re-machine the worn shaft area. The same holds true for
volutes, housings, and impeller wear ring seats.
Always confer with the work center supervisor before performing machining repairs to determine the proper
course of action and to determine the feasibility of the repair. No matter what form of machining repairs will be
accomplished, ensure that the repairs conform to standard machine shop practices and procedures and all
applicable regulations.
THREAD REPAIR
Damaged female threads may be replaced by installing thread inserts. The procedure below describes this
process.
NOTE
The size of the holes drilled and tapped will vary depending upon the size of the insert
used.
1. Select the proper size thread insert. The proper size thread insert should have the same size female threads
as the fastener that will thread into it.
2. Measure the external thread size and pitch of the thread insert selected in step 1.
3. Select the tap that corresponds to the external thread size and pitch of the insert selected in step 1. Also
select the proper size drill bit (figure 1, item 1) for use with the tap.
0043 00-1

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