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 TM 55-1905-223-24-18-1
2-306.
Adjust Electrical Self Generating Shaft Tachometer.
This task covers: Adjustment.
Equipment Condition
Main propulsion engines (port and
Tool kit, general mechanic's,
starboard) shut down. Refer to
TM 55-1905-223-10.
Starting air and control air valves to
Materials/Parts
main propulsion engines (port and
starboard) closed and tagged "Out of
Warning tags, Item 1, Appendix C
Service - Do Not Operate." Refer to
TM 55-1905-223-10.
The motional pickup transducer (5, FIGURE 2-230) contains flat spots (4) that
must be oriented parallel to the propeller shaft flange (1) in order to transmit
a direction/speed signal to shaft tachometer ammeters on the pilothouse and
engine control station consoles.
Main propulsion engines must be shutdown to
perform the following steps to prevent
injury to personnel.
Using machine rule, measure gap distance between pickup sensing lug (2) on
a.
propeller shaft flange (1) and motional pickup transducer (5). Record this
measurement for reference when securing motional pickup transducer.
Loosen jam nuts (6) securing motional pickup transducer (5) to mounting
b.
bracket (3).
If both shaft tachometer ammeters on pilothouse and engine control station
c.
consoles indicate opposite direction (AHEAD or ASTERN) from the direction of
main propulsion shaft, rotate motional pickup transducer (5) 180' in mounting
bracket (3) so that flat spots (4) on motional pickup transducer (5) are now
oriented opposite what they were before.
d.
If both shaft tachometer ammeters on pilothouse and engine control station
consoles do not indicate direction/speed of main propulsion shaft, orient
motional pickup transducer (5) in mounting bracket (3) so that flat spots (4)
are parallel to propeller shaft flange (1).
2-913
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