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 TM 55-1905-223-24-18-2
3-205. Replace/Repair Electrical Self Generating (Shaft) Tachometer. (Figure 3-193)
This task covers:
a. Removal
b. Repair
c. Replacement.
INITIAL SETUP :
Tools
Equipment Condition
Tool kit, general mechanic's,
Main engine shut down. Refer to
TM 55-1905-223-10.
Fuse puller, 5120-00-224-9453
Control and starting air valves to main
engine closed (TM 55-1905-223-24-18)
Materials/Parts
and tagged "Out of Service - Do
Not Operate."
Electrical self generating (shaft)
tachometer P/N DST 2000
Terminal board P/N DST 257
REMOVAL
a. Motional transducer removed. Refer to paragraph 2-307 .
b. Dimmer rheostats removed. Refer to paragraph 2-307 .
c. Arbitrary scale meters for wheelhouse and engine control station consoles removed.
Refer to
paragraph 2-307 .
WARNING
ENGINE RM DC PNL EP024 contains 24 VDC. To prevent
serious injury or damage to equipment, fuse pullers must be
used to remove fuse cartridges.
d. On ENGINE RM DC PNL EP024, use fuse puller and remove fuse cartridge #13, SFT TACH (STBD)
or #14, SFT TACH (PORT) to remove 24 Vdc supply to shaft tachometer circuit.
e. On steel box enclosure (1), release fastener (7) and open cover (6).
f. Tag and disconnect cable (5) leads from terminals #16 and #17 on terminal board (3). Tag and
disconnect ground shield on cable (5) from terminal #8 on terminal board (3).
g. Disassemble cable (5) stuffing tube and remove cable (5) and stuffing tube from steel box enclosure
(1).
3-653
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