DIESEL ENGINE-DRIVEN FIREFIGHTING PUMP, REBUILD

TM 55-1925-292-14&P

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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,

WP 0046 00)

References:

Durco Tool Kit (Item 2, Table 2, WP 0046 00)

Drill, Electric, Portable (Item 16, Table 2,

WP 0037 00

WP 0046 00)

WP 0046 00

Threading Kit, Screw (Item 17, Table 2,

WP 0049 00

WP 0046 00)

Drill Set, Twist Set (Item 18, Table 2,

Equipment Conditions:

Diesel engine-driven firefighting pump disassembled

WP 0046 00)

(WP 0037 00).

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,

WP 0049 00)

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.

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